diff mbox series

[v7,2/6] leds: Add driver for Qualcomm LPG

Message ID 20210429211517.312792-3-bjorn.andersson@linaro.org
State New
Headers show
Series Qualcomm Light Pulse Generator | expand

Commit Message

Bjorn Andersson April 29, 2021, 9:15 p.m. UTC
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. It can operate on fixed parameters or based on a
lookup-table, altering the duty cycle over time - which provides the
means for e.g. hardware assisted transitions of LED brightness.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v6:
- Moved code into drivers/leds/rgb/
- Reverted to earlier qcom,dtest handling to support routing pwm signals
  through dtest lines.
- Remember the duration of each step of the pattern, rather than adding up and
  then dividing when the value is used.
- Added missing error prints on DT parse errors.
- Added sm8150[lb] and made led source and atc presence optional
- Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
  pattern.

 drivers/leds/Kconfig             |    3 +
 drivers/leds/Makefile            |    3 +
 drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
 3 files changed, 1292 insertions(+)
 create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c

Comments

kernel test robot April 30, 2021, 2:22 a.m. UTC | #1
Hi Bjorn,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on pavel-linux-leds/for-next v5.12 next-20210429]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Bjorn-Andersson/Qualcomm-Light-Pulse-Generator/20210430-051736
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/45509bacfcf87714f6a99dd7d01cc31c582e5fa2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bjorn-Andersson/Qualcomm-Light-Pulse-Generator/20210430-051736
        git checkout 45509bacfcf87714f6a99dd7d01cc31c582e5fa2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/leds/Kconfig:935: can't open file "drivers/leds/rgb/Kconfig"
--
>> drivers/leds/Kconfig:935: can't open file "drivers/leds/rgb/Kconfig"
   make[3]: *** [scripts/kconfig/Makefile:63: syncconfig] Error 1
   make[2]: *** [Makefile:600: syncconfig] Error 2
   make[1]: *** [Makefile:709: include/config/auto.conf.cmd] Error 2
   make[1]: Failed to remake makefile 'include/config/auto.conf.cmd'.
   make[1]: Failed to remake makefile 'include/config/auto.conf'.
   make[1]: Target 'modules_prepare' not remade because of errors.
   make: *** [Makefile:215: __sub-make] Error 2
   make: Target 'modules_prepare' not remade because of errors.
--
>> drivers/leds/Kconfig:935: can't open file "drivers/leds/rgb/Kconfig"
   make[2]: *** [scripts/kconfig/Makefile:63: olddefconfig] Error 1
   make[1]: *** [Makefile:600: olddefconfig] Error 2
   make: *** [Makefile:215: __sub-make] Error 2
   make: Target 'olddefconfig' not remade because of errors.
--
>> drivers/leds/Kconfig:935: can't open file "drivers/leds/rgb/Kconfig"
   make[3]: *** [scripts/kconfig/Makefile:63: syncconfig] Error 1
   make[2]: *** [Makefile:600: syncconfig] Error 2
   make[1]: *** [Makefile:709: include/config/auto.conf.cmd] Error 2
   make[1]: Failed to remake makefile 'include/config/auto.conf.cmd'.
   make[1]: Failed to remake makefile 'include/config/auto.conf'.
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:215: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +935 drivers/leds/Kconfig

   933	
   934	comment "RGB LED drivers"
 > 935	source "drivers/leds/rgb/Kconfig"
   936	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
kernel test robot April 30, 2021, 2:48 a.m. UTC | #2
Hi Bjorn,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on pavel-linux-leds/for-next v5.12 next-20210429]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Bjorn-Andersson/Qualcomm-Light-Pulse-Generator/20210430-051736
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/45509bacfcf87714f6a99dd7d01cc31c582e5fa2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bjorn-Andersson/Qualcomm-Light-Pulse-Generator/20210430-051736
        git checkout 45509bacfcf87714f6a99dd7d01cc31c582e5fa2
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> scripts/Makefile.clean:15: drivers/leds/rgb/Makefile: No such file or directory

>> make[4]: *** No rule to make target 'drivers/leds/rgb/Makefile'.

   make[4]: Failed to remake makefile 'drivers/leds/rgb/Makefile'.
   make[3]: *** [scripts/Makefile.clean:68: drivers/leds/rgb] Error 2
   make[3]: Target '__clean' not remade because of errors.
   make[2]: *** [scripts/Makefile.clean:68: drivers/leds] Error 2
   make[2]: Target '__clean' not remade because of errors.
   make[1]: *** [Makefile:1856: _clean_drivers] Error 2
   make[1]: Target 'distclean' not remade because of errors.
   make: *** [Makefile:215: __sub-make] Error 2
   make: Target 'distclean' not remade because of errors.


vim +15 scripts/Makefile.clean

2315c6e4227815 Sam Ravnborg   2005-07-25  12  
2a691470345a00 Sam Ravnborg   2005-07-25  13  # The filename Kbuild has precedence over Makefile
db8c1a7b2ca25f Sam Ravnborg   2005-07-27  14  kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
db8c1a7b2ca25f Sam Ravnborg   2005-07-27 @15  include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)
^1da177e4c3f41 Linus Torvalds 2005-04-16  16  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Marijn Suijten May 1, 2021, 9:09 p.m. UTC | #3
Hi Bjorn,

On 4/29/21 11:15 PM, Bjorn Andersson wrote:
> The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> PMICs from Qualcomm. It can operate on fixed parameters or based on a
> lookup-table, altering the duty cycle over time - which provides the
> means for e.g. hardware assisted transitions of LED brightness.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v6:
> - Moved code into drivers/leds/rgb/
> - Reverted to earlier qcom,dtest handling to support routing pwm signals
>    through dtest lines.
> - Remember the duration of each step of the pattern, rather than adding up and
>    then dividing when the value is used.
> - Added missing error prints on DT parse errors.
> - Added sm8150[lb] and made led source and atc presence optional
> - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
>    pattern.
> 
>   drivers/leds/Kconfig             |    3 +
>   drivers/leds/Makefile            |    3 +
>   drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
>   3 files changed, 1292 insertions(+)
>   create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 49d99cb084db..8ab06b3f162d 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
>   comment "Flash and Torch LED drivers"
>   source "drivers/leds/flash/Kconfig"
>   
> +comment "RGB LED drivers"
> +source "drivers/leds/rgb/Kconfig"


It looks like this file is not included in any of the patches.

> +
>   comment "LED Triggers"
>   source "drivers/leds/trigger/Kconfig"
>   
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 7e604d3028c8..8cad0465aae0 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
>   # Flash and Torch LED Drivers
>   obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
>   
> +# RGB LED Drivers
> +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/


This file appears to be missing from this patch(set), too.

> +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
> +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
> +{
> +	unsigned int idx;
> +	u16 val;
> +	int i;
> +
> +	/* Hardware does not behave when LO_IDX == HI_IDX */
> +	if (len == 1)
> +		return -EINVAL;
> +
> +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
> +					 0, len, 0);
> +	if (idx >= lpg->lut_size)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < len; i++) {
> +		val = pattern[i].brightness;
> +
> +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);


This and the other regmap_bulk_write in lpg_apply_pwm_value used 
sizeof(val) before.  As far as I'm aware qcom-spmi-pmic specifies 16-bit 
addresses (.reg_bits) but 8-bit register sizes (.val_bits).  Writing one 
register means only 8 out of 16 bits in u16 val are written?

> +static void lpg_apply_lut_control(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int step;
> +	unsigned int conf = 0;
> +	unsigned int lo_idx = chan->pattern_lo_idx;
> +	unsigned int hi_idx = chan->pattern_hi_idx;
> +	int pattern_len;
> +
> +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
> +		return;
> +
> +	pattern_len = hi_idx - lo_idx + 1 > +
> +	step = chan->ramp_tick_ms;


Since this is not dividing a full pattern duration by pattern_len 
anymore, that variable is now never read and best removed.

> +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
> +			     struct lpg_channel **channel)
> +{
> +	struct lpg_channel *chan;
> +	u32 color = LED_COLOR_ID_GREEN;
> +	u32 reg;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "reg", &reg);
> +	if (ret || !reg || reg > lpg->num_channels) {
> +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);


Like \"color\" below, escape reg with \"reg\"?

> +static int lpg_add_led(struct lpg *lpg, struct device_node *np)
> +{
> +	struct led_classdev *cdev;
> +	struct device_node *child;
> +	struct mc_subled *info;
> +	struct lpg_led *led;
> +	const char *state;
> +	int num_channels;
> +	u32 color = 0;
> +	int ret;
> +	int i;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	if (color == LED_COLOR_ID_MULTI)


Since this driver now lives under rgb/, and is specifically for RGB leds 
(afaik), should this and the rest of the code use LED_COLOR_ID_RGB 
instead?  There was a patch floating around on (if I remember correctly) 
##linux-msm by Luca Weiss that performs the conversion, with some 
related changes.

> +static int lpg_init_lut(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	size_t bitmap_size;
> +
> +	if (!data->lut_base)
> +		return 0;
> +
> +	lpg->lut_base = data->lut_base;
> +	lpg->lut_size = data->lut_size;
> +
> +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
> +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
> +	if (!lpg->lut_bitmap)
> +		return -ENOMEM;
> +
> +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);


devm_kzalloc already zeroes the bitmap.  Is it necessary to clear it 
again (assuming a "cleared" bitmap is implementation-dependent and does 
not imply zeroed memory) or could the memory be allocated with 
devm_kalloc instead?

Thanks!
Marijn
Bjorn Andersson May 2, 2021, 9:15 p.m. UTC | #4
On Sat 01 May 16:09 CDT 2021, Marijn Suijten wrote:

> Hi Bjorn,

> 

> On 4/29/21 11:15 PM, Bjorn Andersson wrote:

> > The Light Pulse Generator (LPG) is a PWM-block found in a wide range of

> > PMICs from Qualcomm. It can operate on fixed parameters or based on a

> > lookup-table, altering the duty cycle over time - which provides the

> > means for e.g. hardware assisted transitions of LED brightness.

> > 

> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> > ---

> > 

> > Changes since v6:

> > - Moved code into drivers/leds/rgb/

> > - Reverted to earlier qcom,dtest handling to support routing pwm signals

> >    through dtest lines.

> > - Remember the duration of each step of the pattern, rather than adding up and

> >    then dividing when the value is used.

> > - Added missing error prints on DT parse errors.

> > - Added sm8150[lb] and made led source and atc presence optional

> > - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the

> >    pattern.

> > 

> >   drivers/leds/Kconfig             |    3 +

> >   drivers/leds/Makefile            |    3 +

> >   drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++

> >   3 files changed, 1292 insertions(+)

> >   create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c

> > 

> > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig

> > index 49d99cb084db..8ab06b3f162d 100644

> > --- a/drivers/leds/Kconfig

> > +++ b/drivers/leds/Kconfig

> > @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"

> >   comment "Flash and Torch LED drivers"

> >   source "drivers/leds/flash/Kconfig"

> > +comment "RGB LED drivers"

> > +source "drivers/leds/rgb/Kconfig"

> 

> 

> It looks like this file is not included in any of the patches.

> 


Sorry about that, seems like I missed adding them to the commit :(

> > +

> >   comment "LED Triggers"

> >   source "drivers/leds/trigger/Kconfig"

> > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile

> > index 7e604d3028c8..8cad0465aae0 100644

> > --- a/drivers/leds/Makefile

> > +++ b/drivers/leds/Makefile

> > @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o

> >   # Flash and Torch LED Drivers

> >   obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/

> > +# RGB LED Drivers

> > +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/

> 

> 

> This file appears to be missing from this patch(set), too.

> 


Right, missed both the new files.

> > +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,

> > +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)

> > +{

> > +	unsigned int idx;

> > +	u16 val;

> > +	int i;

> > +

> > +	/* Hardware does not behave when LO_IDX == HI_IDX */

> > +	if (len == 1)

> > +		return -EINVAL;

> > +

> > +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,

> > +					 0, len, 0);

> > +	if (idx >= lpg->lut_size)

> > +		return -ENOMEM;

> > +

> > +	for (i = 0; i < len; i++) {

> > +		val = pattern[i].brightness;

> > +

> > +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);

> 

> 

> This and the other regmap_bulk_write in lpg_apply_pwm_value used sizeof(val)

> before.  As far as I'm aware qcom-spmi-pmic specifies 16-bit addresses

> (.reg_bits) but 8-bit register sizes (.val_bits).  Writing one register

> means only 8 out of 16 bits in u16 val are written?

> 


You're right and I should have used test pattern that shown that I lost
that 9th bit...

I'll restore the sizeof()

> > +static void lpg_apply_lut_control(struct lpg_channel *chan)

> > +{

> > +	struct lpg *lpg = chan->lpg;

> > +	unsigned int hi_pause;

> > +	unsigned int lo_pause;

> > +	unsigned int step;

> > +	unsigned int conf = 0;

> > +	unsigned int lo_idx = chan->pattern_lo_idx;

> > +	unsigned int hi_idx = chan->pattern_hi_idx;

> > +	int pattern_len;

> > +

> > +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)

> > +		return;

> > +

> > +	pattern_len = hi_idx - lo_idx + 1 > +

> > +	step = chan->ramp_tick_ms;

> 

> 

> Since this is not dividing a full pattern duration by pattern_len anymore,

> that variable is now never read and best removed.

> 


Ok

> > +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,

> > +			     struct lpg_channel **channel)

> > +{

> > +	struct lpg_channel *chan;

> > +	u32 color = LED_COLOR_ID_GREEN;

> > +	u32 reg;

> > +	int ret;

> > +

> > +	ret = of_property_read_u32(np, "reg", &reg);

> > +	if (ret || !reg || reg > lpg->num_channels) {

> > +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);

> 

> 

> Like \"color\" below, escape reg with \"reg\"?

> 


Sounds good.

> > +static int lpg_add_led(struct lpg *lpg, struct device_node *np)

> > +{

> > +	struct led_classdev *cdev;

> > +	struct device_node *child;

> > +	struct mc_subled *info;

> > +	struct lpg_led *led;

> > +	const char *state;

> > +	int num_channels;

> > +	u32 color = 0;

> > +	int ret;

> > +	int i;

> > +

> > +	ret = of_property_read_u32(np, "color", &color);

> > +	if (ret < 0 && ret != -EINVAL) {

> > +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);

> > +		return ret;

> > +	}

> > +

> > +	if (color == LED_COLOR_ID_MULTI)

> 

> 

> Since this driver now lives under rgb/, and is specifically for RGB leds

> (afaik), should this and the rest of the code use LED_COLOR_ID_RGB instead?

> There was a patch floating around on (if I remember correctly) ##linux-msm

> by Luca Weiss that performs the conversion, with some related changes.

> 


I thought MULTICOLOR was the right color, but reading the comment on the
defines it seems RGB is the color I actually want. Will check out
z3ntu's changes as well.

> > +static int lpg_init_lut(struct lpg *lpg)

> > +{

> > +	const struct lpg_data *data = lpg->data;

> > +	size_t bitmap_size;

> > +

> > +	if (!data->lut_base)

> > +		return 0;

> > +

> > +	lpg->lut_base = data->lut_base;

> > +	lpg->lut_size = data->lut_size;

> > +

> > +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);

> > +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);

> > +	if (!lpg->lut_bitmap)

> > +		return -ENOMEM;

> > +

> > +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);

> 

> 

> devm_kzalloc already zeroes the bitmap.  Is it necessary to clear it again

> (assuming a "cleared" bitmap is implementation-dependent and does not imply

> zeroed memory) or could the memory be allocated with devm_kalloc instead?

> 


You're right, I can drop the explicit clear of the bitmap.

Thanks,
Bjorn
Subbaraman Narayanamurthy May 4, 2021, 1:20 a.m. UTC | #5
On 4/29/21 2:15 PM, Bjorn Andersson wrote:
> The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> PMICs from Qualcomm. It can operate on fixed parameters or based on a
> lookup-table, altering the duty cycle over time - which provides the
> means for e.g. hardware assisted transitions of LED brightness.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v6:
> - Moved code into drivers/leds/rgb/
> - Reverted to earlier qcom,dtest handling to support routing pwm signals
>   through dtest lines.
> - Remember the duration of each step of the pattern, rather than adding up and
>   then dividing when the value is used.
> - Added missing error prints on DT parse errors.
> - Added sm8150[lb] and made led source and atc presence optional
> - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
>   pattern.
>
>  drivers/leds/Kconfig             |    3 +
>  drivers/leds/Makefile            |    3 +
>  drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
>  3 files changed, 1292 insertions(+)
>  create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 49d99cb084db..8ab06b3f162d 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
>  comment "Flash and Torch LED drivers"
>  source "drivers/leds/flash/Kconfig"
>  
> +comment "RGB LED drivers"
> +source "drivers/leds/rgb/Kconfig"


Are you planning to add "drivers/leds/rgb/Kconfig" and "drivers/leds/rgb/Makefile" as a separate change?


> +
>  comment "LED Triggers"
>  source "drivers/leds/trigger/Kconfig"
>  
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 7e604d3028c8..8cad0465aae0 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
>  # Flash and Torch LED Drivers
>  obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
>  
> +# RGB LED Drivers
> +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/
> +
>  # LED Triggers
>  obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/
>  
> diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
> new file mode 100644
> index 000000000000..c68233b43c2c
> --- /dev/null
> +++ b/drivers/leds/rgb/leds-qcom-lpg.c
> @@ -0,0 +1,1286 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2017-2021 Linaro Ltd
> + * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
> + */
> +#include <linux/bits.h>
> +#include <linux/led-class-multicolor.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pwm.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +#define LPG_PATTERN_CONFIG_REG	0x40
> +#define LPG_SIZE_CLK_REG	0x41
> +#define LPG_PREDIV_CLK_REG	0x42
> +#define PWM_TYPE_CONFIG_REG	0x43
> +#define PWM_VALUE_REG		0x44
> +#define PWM_ENABLE_CONTROL_REG	0x46
> +#define PWM_SYNC_REG		0x47
> +#define LPG_RAMP_DURATION_REG	0x50
> +#define LPG_HI_PAUSE_REG	0x52
> +#define LPG_LO_PAUSE_REG	0x54
> +#define LPG_HI_IDX_REG		0x56
> +#define LPG_LO_IDX_REG		0x57
> +#define PWM_SEC_ACCESS_REG	0xd0
> +#define PWM_DTEST_REG(x)	(0xe2 + (x) - 1)
> +
> +#define TRI_LED_SRC_SEL		0x45
> +#define TRI_LED_EN_CTL		0x46
> +#define TRI_LED_ATC_CTL		0x47
> +
> +#define LPG_LUT_REG(x)		(0x40 + (x) * 2)
> +#define RAMP_CONTROL_REG	0xc8
> +
> +struct lpg_channel;
> +struct lpg_data;
> +
> +/**
> + * struct lpg - LPG device context
> + * @dev:	struct device for LPG device
> + * @map:	regmap for register access
> + * @pwm:	PWM-chip object, if operating in PWM mode
> + * @lut_base:	base address of the LUT block (optional)
> + * @lut_size:	number of entries in the LUT block
> + * @lut_bitmap:	allocation bitmap for LUT entries
> + * @triled_base: base address of the TRILED block (optional)
> + * @triled_src:	power-source for the TRILED
> + * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
> + * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
> + * @channels:	list of PWM channels
> + * @num_channels: number of @channels
> + */
> +struct lpg {
> +	struct device *dev;
> +	struct regmap *map;
> +
> +	struct pwm_chip pwm;
> +
> +	const struct lpg_data *data;
> +
> +	u32 lut_base;
> +	u32 lut_size;
> +	unsigned long *lut_bitmap;
> +
> +	u32 triled_base;
> +	u32 triled_src;
> +	bool triled_has_atc_ctl;
> +	bool triled_has_src_sel;
> +
> +	struct lpg_channel *channels;
> +	unsigned int num_channels;
> +};
> +
> +/**
> + * struct lpg_channel - per channel data
> + * @lpg:	reference to parent lpg
> + * @base:	base address of the PWM channel
> + * @triled_mask: mask in TRILED to enable this channel
> + * @lut_mask:	mask in LUT to start pattern generator for this channel
> + * @in_use:	channel is exposed to LED framework
> + * @color:	color of the LED attached to this channel
> + * @dtest_line:	DTEST line for output, or 0 if disabled
> + * @dtest_value: DTEST line configuration
> + * @pwm_value:	duty (in microseconds) of the generated pulses, overridden by LUT
> + * @enabled:	output enabled?
> + * @period_us:	period (in microseconds) of the generated pulses
> + * @pwm_size:	resolution of the @pwm_value, 6 or 9 bits
> + * @clk:	base frequency of the clock generator
> + * @pre_div:	divider of @clk
> + * @pre_div_exp: exponential divider of @clk
> + * @ramp_enabled: duty cycle is driven by iterating over lookup table
> + * @ramp_ping_pong: reverse through pattern, rather than wrapping to start
> + * @ramp_oneshot: perform only a single pass over the pattern
> + * @ramp_reverse: iterate over pattern backwards
> + * @ramp_tick_ms: length (in milliseconds) of one step in the pattern
> + * @ramp_lo_pause_ms: pause (in milliseconds) before iterating over pattern
> + * @ramp_hi_pause_ms: pause (in milliseconds) after iterating over pattern
> + * @pattern_lo_idx: start index of associated pattern
> + * @pattern_hi_idx: last index of associated pattern
> + */
> +struct lpg_channel {
> +	struct lpg *lpg;
> +
> +	u32 base;
> +	unsigned int triled_mask;
> +	unsigned int lut_mask;
> +
> +	bool in_use;
> +
> +	int color;
> +
> +	u32 dtest_line;
> +	u32 dtest_value;
> +
> +	u16 pwm_value;
> +	bool enabled;
> +
> +	unsigned int period_us;
> +	unsigned int pwm_size;
> +	unsigned int clk;
> +	unsigned int pre_div;
> +	unsigned int pre_div_exp;
> +
> +	bool ramp_enabled;
> +	bool ramp_ping_pong;
> +	bool ramp_oneshot;
> +	bool ramp_reverse;
> +	unsigned long ramp_tick_ms;
> +	unsigned long ramp_lo_pause_ms;
> +	unsigned long ramp_hi_pause_ms;
> +
> +	unsigned int pattern_lo_idx;
> +	unsigned int pattern_hi_idx;
> +};
> +
> +/**
> + * struct lpg_led - logical LED object
> + * @lpg:		lpg context reference
> + * @cdev:		LED class device
> + * @mcdev:		Multicolor LED class device
> + * @num_channels:	number of @channels
> + * @channels:		list of channels associated with the LED
> + */
> +struct lpg_led {
> +	struct lpg *lpg;
> +
> +	struct led_classdev cdev;
> +	struct led_classdev_mc mcdev;
> +
> +	unsigned int num_channels;
> +	struct lpg_channel *channels[];
> +};
> +
> +/**
> + * struct lpg_channel_data - per channel initialization data
> + * @base:		base address for PWM channel registers
> + * @triled_mask:	bitmask for controlling this channel in TRILED
> + */
> +struct lpg_channel_data {
> +	unsigned int base;
> +	u8 triled_mask;
> +};
> +
> +/**
> + * struct lpg_data - initialization data
> + * @lut_base:		base address of LUT block
> + * @lut_size:		number of entries in LUT
> + * @triled_base:	base address of TRILED
> + * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
> + * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
> + * @pwm_9bit_mask:	bitmask for switching from 6bit to 9bit pwm
> + * @num_channels:	number of channels in LPG
> + * @channels:		list of channel initialization data
> + */
> +struct lpg_data {
> +	unsigned int lut_base;
> +	unsigned int lut_size;
> +	unsigned int triled_base;
> +	bool triled_has_atc_ctl;
> +	bool triled_has_src_sel;
> +	unsigned int pwm_9bit_mask;
> +	int num_channels;
> +	struct lpg_channel_data *channels;
> +};
> +
> +static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
> +{
> +	/* Skip if we don't have a triled block */
> +	if (!lpg->triled_base)
> +		return 0;
> +
> +	return regmap_update_bits(lpg->map, lpg->triled_base + TRI_LED_EN_CTL,
> +				  mask, enable);
> +}
> +
> +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
> +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
> +{
> +	unsigned int idx;
> +	u16 val;
> +	int i;
> +
> +	/* Hardware does not behave when LO_IDX == HI_IDX */
> +	if (len == 1)
> +		return -EINVAL;
> +
> +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
> +					 0, len, 0);
> +	if (idx >= lpg->lut_size)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < len; i++) {
> +		val = pattern[i].brightness;
> +
> +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);
> +	}
> +
> +	bitmap_set(lpg->lut_bitmap, idx, len);
> +
> +	*lo_idx = idx;
> +	*hi_idx = idx + len - 1;
> +
> +	return 0;
> +}
> +
> +static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_idx)
> +{
> +	int len;
> +
> +	if (lo_idx == hi_idx)
> +		return;
> +
> +	len = hi_idx - lo_idx + 1;
> +	bitmap_clear(lpg->lut_bitmap, lo_idx, len);
> +}
> +
> +static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
> +{
> +	return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
> +}
> +
> +#define NUM_PWM_PREDIV	4
> +#define NUM_PWM_CLK	3
> +#define NUM_EXP		7
> +
> +static const unsigned int lpg_clk_table[NUM_PWM_PREDIV][NUM_PWM_CLK] = {
> +	{
> +		1 * (NSEC_PER_SEC / 1024),
> +		1 * (NSEC_PER_SEC / 32768),
> +		1 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		3 * (NSEC_PER_SEC / 1024),
> +		3 * (NSEC_PER_SEC / 32768),
> +		3 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		5 * (NSEC_PER_SEC / 1024),
> +		5 * (NSEC_PER_SEC / 32768),
> +		5 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		6 * (NSEC_PER_SEC / 1024),
> +		6 * (NSEC_PER_SEC / 32768),
> +		6 * (NSEC_PER_SEC / 19200000),
> +	},
> +};
> +
> +/*
> + * PWM Frequency = Clock Frequency / (N * T)
> + *      or
> + * PWM Period = Clock Period * (N * T)
> + *      where
> + * N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
> + * T = Pre-divide * 2^m, where m = 0..7 (exponent)
> + *
> + * This is the formula to figure out m for the best pre-divide and clock:
> + * (PWM Period / N) = (Pre-divide * Clock Period) * 2^m
> + */
> +static void lpg_calc_freq(struct lpg_channel *chan, unsigned int period_us)
> +{
> +	int             n, m, clk, div;
> +	int             best_m, best_div, best_clk;
> +	unsigned int    last_err, cur_err, min_err;
> +	unsigned int    tmp_p, period_n;
> +
> +	if (period_us == chan->period_us)
> +		return;
> +
> +	/* PWM Period / N */
> +	if (period_us < UINT_MAX / NSEC_PER_USEC)
> +		n = 6;
> +	else
> +		n = 9;
> +
> +	period_n = ((u64)period_us * NSEC_PER_USEC) >> n;
> +
> +	min_err = UINT_MAX;
> +	last_err = UINT_MAX;
> +	best_m = 0;
> +	best_clk = 0;
> +	best_div = 0;
> +	for (clk = 0; clk < NUM_PWM_CLK; clk++) {
> +		for (div = 0; div < NUM_PWM_PREDIV; div++) {
> +			/* period_n = (PWM Period / N) */
> +			/* tmp_p = (Pre-divide * Clock Period) * 2^m */
> +			tmp_p = lpg_clk_table[div][clk];
> +			for (m = 0; m <= NUM_EXP; m++) {
> +				cur_err = abs(period_n - tmp_p);
> +				if (cur_err < min_err) {
> +					min_err = cur_err;
> +					best_m = m;
> +					best_clk = clk;
> +					best_div = div;
> +				}
> +
> +				if (m && cur_err > last_err)
> +					/* Break for bigger cur_err */
> +					break;
> +
> +				last_err = cur_err;
> +				tmp_p <<= 1;
> +			}
> +		}
> +	}
> +
> +	/* Use higher resolution */
> +	if (best_m >= 3 && n == 6) {
> +		n += 3;
> +		best_m -= 3;
> +	}
> +
> +	chan->clk = best_clk;
> +	chan->pre_div = best_div;
> +	chan->pre_div_exp = best_m;
> +	chan->pwm_size = n;
> +
> +	chan->period_us = period_us;
> +}
> +
> +static void lpg_calc_duty(struct lpg_channel *chan, unsigned int duty_us)
> +{
> +	unsigned int max = (1 << chan->pwm_size) - 1;
> +	unsigned int val = div_u64((u64)duty_us << chan->pwm_size, chan->period_us);
> +
> +	chan->pwm_value = min(val, max);
> +}
> +
> +static void lpg_apply_freq(struct lpg_channel *chan)
> +{
> +	unsigned long val;
> +	struct lpg *lpg = chan->lpg;
> +
> +	if (!chan->enabled)
> +		return;
> +
> +	/* Clock register values are off-by-one from lpg_clk_table */
> +	val = chan->clk + 1;
> +
> +	if (chan->pwm_size == 9)
> +		val |= lpg->data->pwm_9bit_mask;
> +
> +	regmap_write(lpg->map, chan->base + LPG_SIZE_CLK_REG, val);
> +
> +	val = chan->pre_div << 5 | chan->pre_div_exp;
> +	regmap_write(lpg->map, chan->base + LPG_PREDIV_CLK_REG, val);
> +}
> +
> +#define LPG_ENABLE_GLITCH_REMOVAL	BIT(5)
> +
> +static void lpg_enable_glitch(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
> +			   LPG_ENABLE_GLITCH_REMOVAL, 0);
> +}
> +
> +static void lpg_disable_glitch(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
> +			   LPG_ENABLE_GLITCH_REMOVAL,
> +			   LPG_ENABLE_GLITCH_REMOVAL);
> +}
> +
> +static void lpg_apply_pwm_value(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	u16 val = chan->pwm_value;
> +
> +	if (!chan->enabled)
> +		return;
> +
> +	regmap_bulk_write(lpg->map, chan->base + PWM_VALUE_REG, &val, 1);
> +}
> +
> +#define LPG_PATTERN_CONFIG_LO_TO_HI	BIT(4)
> +#define LPG_PATTERN_CONFIG_REPEAT	BIT(3)
> +#define LPG_PATTERN_CONFIG_TOGGLE	BIT(2)
> +#define LPG_PATTERN_CONFIG_PAUSE_HI	BIT(1)
> +#define LPG_PATTERN_CONFIG_PAUSE_LO	BIT(0)
> +
> +static void lpg_apply_lut_control(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int step;
> +	unsigned int conf = 0;
> +	unsigned int lo_idx = chan->pattern_lo_idx;
> +	unsigned int hi_idx = chan->pattern_hi_idx;
> +	int pattern_len;
> +
> +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
> +		return;
> +
> +	pattern_len = hi_idx - lo_idx + 1;
> +
> +	step = chan->ramp_tick_ms;
> +	hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, step);
> +	lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, step);
> +
> +	if (!chan->ramp_reverse)
> +		conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
> +	if (!chan->ramp_oneshot)
> +		conf |= LPG_PATTERN_CONFIG_REPEAT;
> +	if (chan->ramp_ping_pong)
> +		conf |= LPG_PATTERN_CONFIG_TOGGLE;
> +	if (chan->ramp_hi_pause_ms)
> +		conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
> +	if (chan->ramp_lo_pause_ms)
> +		conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
> +
> +	regmap_write(lpg->map, chan->base + LPG_PATTERN_CONFIG_REG, conf);
> +	regmap_write(lpg->map, chan->base + LPG_HI_IDX_REG, hi_idx);
> +	regmap_write(lpg->map, chan->base + LPG_LO_IDX_REG, lo_idx);
> +
> +	regmap_write(lpg->map, chan->base + LPG_RAMP_DURATION_REG, step);
> +	regmap_write(lpg->map, chan->base + LPG_HI_PAUSE_REG, hi_pause);
> +	regmap_write(lpg->map, chan->base + LPG_LO_PAUSE_REG, lo_pause);
> +}
> +
> +#define LPG_ENABLE_CONTROL_OUTPUT		BIT(7)
> +#define LPG_ENABLE_CONTROL_BUFFER_TRISTATE	BIT(5)
> +#define LPG_ENABLE_CONTROL_SRC_PWM		BIT(2)
> +#define LPG_ENABLE_CONTROL_RAMP_GEN		BIT(1)
> +
> +static void lpg_apply_control(struct lpg_channel *chan)
> +{
> +	unsigned int ctrl;
> +	struct lpg *lpg = chan->lpg;
> +
> +	ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
> +
> +	if (chan->enabled)
> +		ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
> +
> +	if (chan->pattern_lo_idx != chan->pattern_hi_idx)
> +		ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
> +	else
> +		ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
> +
> +	regmap_write(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, ctrl);
> +
> +	/*
> +	 * Due to LPG hardware bug, in the PWM mode, having enabled PWM,
> +	 * We have to write PWM values one more time.
> +	 */
> +	if (chan->enabled)
> +		lpg_apply_pwm_value(chan);
> +}
> +
> +#define LPG_SYNC_PWM	BIT(0)
> +
> +static void lpg_apply_sync(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_write(lpg->map, chan->base + PWM_SYNC_REG, LPG_SYNC_PWM);
> +}
> +
> +static int lpg_parse_dtest(struct lpg *lpg)
> +{
> +	struct lpg_channel *chan;
> +	struct device_node *np = lpg->dev->of_node;
> +	int count;
> +	int ret;
> +	int i;
> +
> +	count = of_property_count_u32_elems(np, "qcom,dtest");
> +	if (count == -EINVAL) {
> +		return 0;
> +	} else if (count < 0) {
> +		ret = count;
> +		goto err_malformed;
> +	} else if (count != lpg->data->num_channels * 2) {
> +		dev_err(lpg->dev, "qcom,dtest needs to be %d items\n",
> +			lpg->data->num_channels * 2);
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < lpg->data->num_channels; i++) {
> +		chan = &lpg->channels[i];
> +
> +		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2,
> +						 &chan->dtest_line);
> +		if (ret)
> +			goto err_malformed;
> +
> +		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2 + 1,
> +						 &chan->dtest_value);
> +		if (ret)
> +			goto err_malformed;
> +	}
> +
> +	return 0;
> +
> +err_malformed:
> +	dev_err(lpg->dev, "malformed qcom,dtest\n");
> +	return ret;
> +}
> +
> +static void lpg_apply_dtest(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	if (!chan->dtest_line)
> +		return;
> +
> +	regmap_write(lpg->map, chan->base + PWM_SEC_ACCESS_REG, 0xa5);
> +	regmap_write(lpg->map, chan->base + PWM_DTEST_REG(chan->dtest_line),
> +		     chan->dtest_value);
> +}
> +
> +static void lpg_apply(struct lpg_channel *chan)
> +{
> +	lpg_disable_glitch(chan);
> +	lpg_apply_freq(chan);
> +	lpg_apply_pwm_value(chan);
> +	lpg_apply_control(chan);
> +	lpg_apply_sync(chan);
> +	lpg_apply_lut_control(chan);
> +	lpg_enable_glitch(chan);
> +}
> +
> +static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
> +			       struct mc_subled *subleds)
> +{
> +	enum led_brightness brightness;
> +	struct lpg_channel *chan;
> +	unsigned int triled_enabled = 0;
> +	unsigned int triled_mask = 0;
> +	unsigned int lut_mask = 0;
> +	unsigned int duty_us;
> +	struct lpg *lpg = led->lpg;
> +	int i;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +		brightness = subleds[i].brightness;
> +
> +		if (brightness == LED_OFF) {
> +			chan->enabled = false;
> +			chan->ramp_enabled = false;
> +		} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
> +			lpg_calc_freq(chan, NSEC_PER_USEC);
> +
> +			chan->enabled = true;
> +			chan->ramp_enabled = true;
> +
> +			lut_mask |= chan->lut_mask;
> +			triled_enabled |= chan->triled_mask;
> +		} else {
> +			lpg_calc_freq(chan, NSEC_PER_USEC);
> +
> +			duty_us = brightness * chan->period_us / cdev->max_brightness;
> +			lpg_calc_duty(chan, duty_us);
> +			chan->enabled = true;
> +			chan->ramp_enabled = false;
> +
> +			triled_enabled |= chan->triled_mask;
> +		}
> +
> +		triled_mask |= chan->triled_mask;
> +
> +		lpg_apply(chan);
> +	}
> +
> +	/* Toggle triled lines */
> +	if (triled_mask)
> +		triled_set(lpg, triled_mask, triled_enabled);
> +
> +	/* Trigger start of ramp generator(s) */
> +	if (lut_mask)
> +		lpg_lut_sync(lpg, lut_mask);
> +}
> +
> +static void lpg_brightness_single_set(struct led_classdev *cdev,
> +				      enum led_brightness value)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +	struct mc_subled info;
> +
> +	info.brightness = value;
> +	lpg_brightness_set(led, cdev, &info);
> +}
> +
> +static void lpg_brightness_mc_set(struct led_classdev *cdev,
> +				  enum led_brightness value)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	led_mc_calc_color_components(mc, value);
> +	lpg_brightness_set(led, cdev, mc->subled_info);
> +}
> +
> +static int lpg_blink_set(struct lpg_led *led,
> +			 unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct lpg_channel *chan;
> +	unsigned int period_us;
> +	unsigned int duty_us;
> +	int i;
> +
> +	if (!*delay_on && !*delay_off) {
> +		*delay_on = 500;
> +		*delay_off = 500;
> +	}
> +
> +	duty_us = *delay_on * USEC_PER_MSEC;
> +	period_us = (*delay_on + *delay_off) * USEC_PER_MSEC;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +
> +		lpg_calc_freq(chan, period_us);
> +		lpg_calc_duty(chan, duty_us);
> +
> +		chan->enabled = true;
> +		chan->ramp_enabled = false;
> +
> +		lpg_apply(chan);
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_blink_single_set(struct led_classdev *cdev,
> +				unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +
> +	return lpg_blink_set(led, delay_on, delay_off);
> +}
> +
> +static int lpg_blink_mc_set(struct led_classdev *cdev,
> +			    unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	return lpg_blink_set(led, delay_on, delay_off);
> +}
> +
> +static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *pattern,
> +			   u32 len, int repeat)
> +{
> +	struct lpg_channel *chan;
> +	struct lpg *lpg = led->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int lo_idx;
> +	unsigned int hi_idx;
> +	bool ping_pong = true;
> +	int brightness_a;
> +	int brightness_b;
> +	int ret;
> +	int i;
> +
> +	/* Only support oneshot or indefinite loops, due to limited pattern space */
> +	if (repeat != -1 && repeat != 1)
> +		return -EINVAL;
> +
> +	/*
> +	 * The LPG plays patterns with at a fixed pace, a "low pause" can be
> +	 * performed before the pattern and a "high pause" after. In order to
> +	 * save space the pattern can be played in "ping pong" mode, in which
> +	 * the pattern is first played forward, then "high pause" is applied,
> +	 * then the pattern is played backwards and finally the "low pause" is
> +	 * applied.
> +	 *
> +	 * The delta_t of the first entry is used to determine the pace of the
> +	 * pattern.
> +	 *
> +	 * If the specified pattern is a palindrome the ping pong mode is
> +	 * enabled. In this scenario the delta_t of the last entry determines
> +	 * the "low pause" time and the delta_t of the middle entry (i.e. the
> +	 * last in the programmed pattern) determines the "high pause". If the
> +	 * pattern consists of an odd number of values, no "high pause" is
> +	 * used.
> +	 *
> +	 * When ping pong mode is not selected, the delta_t of the last entry
> +	 * is used as "high pause". No "low pause" is used.
> +	 *
> +	 * delta_t of any other members of the pattern is ignored.
> +	 */
> +
> +	/* Detect palindromes and use "ping pong" to reduce LUT usage */
> +	for (i = 0; i < len / 2; i++) {
> +		brightness_a = pattern[i].brightness;
> +		brightness_b = pattern[len - i - 1].brightness;
> +
> +		if (brightness_a != brightness_b) {
> +			ping_pong = false;
> +			break;
> +		}
> +	}
> +
> +	if (ping_pong) {
> +		if (len % 2)
> +			hi_pause = 0;
> +		else
> +			hi_pause = pattern[(len + 1) / 2].delta_t;
> +		lo_pause = pattern[len - 1].delta_t;
> +
> +		len = (len + 1) / 2;
> +	} else {
> +		hi_pause = pattern[len - 1].delta_t;
> +		lo_pause = 0;
> +	}
> +
> +	ret = lpg_lut_store(lpg, pattern, len, &lo_idx, &hi_idx);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +
> +		chan->ramp_tick_ms = pattern[0].delta_t;
> +		chan->ramp_ping_pong = ping_pong;
> +		chan->ramp_oneshot = repeat != -1;
> +
> +		chan->ramp_lo_pause_ms = lo_pause;
> +		chan->ramp_hi_pause_ms = hi_pause;
> +
> +		chan->pattern_lo_idx = lo_idx;
> +		chan->pattern_hi_idx = hi_idx;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_single_set(struct led_classdev *cdev,
> +				  struct led_pattern *pattern, u32 len,
> +				  int repeat)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +	int ret;
> +
> +	ret = lpg_pattern_set(led, pattern, len, repeat);
> +	if (ret < 0)
> +		return ret;
> +
> +	lpg_brightness_single_set(cdev, LED_FULL);
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_mc_set(struct led_classdev *cdev,
> +			      struct led_pattern *pattern, u32 len,
> +			      int repeat)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +	int ret;
> +
> +	ret = lpg_pattern_set(led, pattern, len, repeat);
> +	if (ret < 0)
> +		return ret;
> +
> +	led_mc_calc_color_components(mc, LED_FULL);
> +	lpg_brightness_set(led, cdev, mc->subled_info);
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_clear(struct lpg_led *led)
> +{
> +	struct lpg_channel *chan;
> +	struct lpg *lpg = led->lpg;
> +	int i;
> +
> +	chan = led->channels[0];
> +	lpg_lut_free(lpg, chan->pattern_lo_idx, chan->pattern_hi_idx);
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +		chan->pattern_lo_idx = 0;
> +		chan->pattern_hi_idx = 0;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_single_clear(struct led_classdev *cdev)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +
> +	return lpg_pattern_clear(led);
> +}
> +
> +static int lpg_pattern_mc_clear(struct led_classdev *cdev)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	return lpg_pattern_clear(led);
> +}
> +
> +static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> +	struct lpg *lpg = container_of(chip, struct lpg, pwm);
> +	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
> +
> +	return chan->in_use ? -EBUSY : 0;
> +}
> +
> +static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> +			 const struct pwm_state *state)
> +{
> +	struct lpg *lpg = container_of(chip, struct lpg, pwm);
> +	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
> +
> +	lpg_calc_freq(chan, div_u64(state->period, NSEC_PER_USEC));
> +	lpg_calc_duty(chan, div_u64(state->duty_cycle, NSEC_PER_USEC));
> +	chan->enabled = state->enabled;
> +
> +	lpg_apply(chan);
> +
> +	triled_set(lpg, chan->triled_mask, chan->enabled ? chan->triled_mask : 0);
> +
> +	return 0;
> +}
> +
> +static const struct pwm_ops lpg_pwm_ops = {
> +	.request = lpg_pwm_request,
> +	.apply = lpg_pwm_apply,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int lpg_add_pwm(struct lpg *lpg)
> +{
> +	int ret;
> +
> +	lpg->pwm.base = -1;
> +	lpg->pwm.dev = lpg->dev;
> +	lpg->pwm.npwm = lpg->num_channels;
> +	lpg->pwm.ops = &lpg_pwm_ops;
> +
> +	ret = pwmchip_add(&lpg->pwm);
> +	if (ret)
> +		dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
> +			     struct lpg_channel **channel)
> +{
> +	struct lpg_channel *chan;
> +	u32 color = LED_COLOR_ID_GREEN;
> +	u32 reg;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "reg", &reg);
> +	if (ret || !reg || reg > lpg->num_channels) {
> +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);
> +		return -EINVAL;
> +	}
> +
> +	chan = &lpg->channels[reg - 1];
> +	chan->in_use = true;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	chan->color = color;
> +
> +	*channel = chan;
> +
> +	return 0;
> +}
> +
> +static int lpg_add_led(struct lpg *lpg, struct device_node *np)
> +{
> +	struct led_classdev *cdev;
> +	struct device_node *child;
> +	struct mc_subled *info;
> +	struct lpg_led *led;
> +	const char *state;
> +	int num_channels;
> +	u32 color = 0;
> +	int ret;
> +	int i;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	if (color == LED_COLOR_ID_MULTI)
> +		num_channels = of_get_available_child_count(np);
> +	else
> +		num_channels = 1;
> +
> +	led = devm_kzalloc(lpg->dev, struct_size(led, channels, num_channels), GFP_KERNEL);
> +	if (!led)
> +		return -ENOMEM;
> +
> +	led->lpg = lpg;
> +	led->num_channels = num_channels;
> +
> +	if (color == LED_COLOR_ID_MULTI) {
> +		info = devm_kcalloc(lpg->dev, num_channels, sizeof(*info), GFP_KERNEL);
> +		if (!info)
> +			return -ENOMEM;
> +		i = 0;
> +		for_each_available_child_of_node(np, child) {
> +			ret = lpg_parse_channel(lpg, child, &led->channels[i]);
> +			if (ret < 0)
> +				return ret;
> +
> +			info[i].color_index = led->channels[i]->color;
> +			info[i].intensity = LED_FULL;
> +			i++;
> +		}
> +
> +		led->mcdev.subled_info = info;
> +		led->mcdev.num_colors = num_channels;
> +
> +		cdev = &led->mcdev.led_cdev;
> +		cdev->brightness_set = lpg_brightness_mc_set;
> +		cdev->blink_set = lpg_blink_mc_set;
> +
> +		/* Register pattern accessors only if we have a LUT block */
> +		if (lpg->lut_base) {
> +			cdev->pattern_set = lpg_pattern_mc_set;
> +			cdev->pattern_clear = lpg_pattern_mc_clear;
> +		}
> +	} else {
> +		ret = lpg_parse_channel(lpg, np, &led->channels[0]);
> +		if (ret < 0)
> +			return ret;
> +
> +		cdev = &led->cdev;
> +		cdev->brightness_set = lpg_brightness_single_set;
> +		cdev->blink_set = lpg_blink_single_set;
> +
> +		/* Register pattern accessors only if we have a LUT block */
> +		if (lpg->lut_base) {
> +			cdev->pattern_set = lpg_pattern_single_set;
> +			cdev->pattern_clear = lpg_pattern_single_clear;
> +		}
> +	}
> +
> +	/* Use label else node name */
> +	cdev->name = of_get_property(np, "label", NULL) ? : np->name;
> +	cdev->default_trigger = of_get_property(np, "linux,default-trigger", NULL);
> +	cdev->max_brightness = 255;
> +
> +	if (!of_property_read_string(np, "default-state", &state) &&
> +	    !strcmp(state, "on"))
> +		cdev->brightness = LED_FULL;
> +	else
> +		cdev->brightness = LED_OFF;
> +
> +	cdev->brightness_set(cdev, cdev->brightness);
> +
> +	if (color == LED_COLOR_ID_MULTI)
> +		ret = devm_led_classdev_multicolor_register(lpg->dev, &led->mcdev);
> +	else
> +		ret = devm_led_classdev_register(lpg->dev, &led->cdev);
> +	if (ret)
> +		dev_err(lpg->dev, "unable to register %s\n", cdev->name);
> +
> +	return ret;
> +}
> +
> +static int lpg_init_channels(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	int i;
> +
> +	lpg->num_channels = data->num_channels;
> +	lpg->channels = devm_kcalloc(lpg->dev, data->num_channels,
> +				     sizeof(struct lpg_channel), GFP_KERNEL);
> +	if (!lpg->channels)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < data->num_channels; i++) {
> +		lpg->channels[i].lpg = lpg;
> +		lpg->channels[i].base = data->channels[i].base;
> +		lpg->channels[i].triled_mask = data->channels[i].triled_mask;
> +		lpg->channels[i].lut_mask = BIT(i);
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_init_triled(struct lpg *lpg)
> +{
> +	struct device_node *np = lpg->dev->of_node;
> +	int ret;
> +
> +	/* Skip initialization if we don't have a triled block */
> +	if (!lpg->data->triled_base)
> +		return 0;
> +
> +	lpg->triled_base = lpg->data->triled_base;
> +	lpg->triled_has_atc_ctl = lpg->data->triled_has_atc_ctl;
> +	lpg->triled_has_src_sel = lpg->data->triled_has_src_sel;
> +
> +	if (lpg->triled_has_src_sel) {
> +		ret = of_property_read_u32(np, "qcom,power-source", &lpg->triled_src);
> +		if (ret || lpg->triled_src == 2 || lpg->triled_src > 3) {
> +			dev_err(lpg->dev, "invalid power source\n");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	/* Disable automatic trickle charge LED */
> +	if (lpg->triled_has_atc_ctl)
> +		regmap_write(lpg->map, lpg->triled_base + TRI_LED_ATC_CTL, 0);
> +
> +	/* Configure power source */
> +	if (lpg->triled_has_src_sel)
> +		regmap_write(lpg->map, lpg->triled_base + TRI_LED_SRC_SEL, lpg->triled_src);
> +
> +	/* Default all outputs to off */
> +	regmap_write(lpg->map, lpg->triled_base + TRI_LED_EN_CTL, 0);
> +
> +	return 0;
> +}
> +
> +static int lpg_init_lut(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	size_t bitmap_size;
> +
> +	if (!data->lut_base)
> +		return 0;
> +
> +	lpg->lut_base = data->lut_base;
> +	lpg->lut_size = data->lut_size;
> +
> +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
> +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
> +	if (!lpg->lut_bitmap)
> +		return -ENOMEM;
> +
> +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);
> +
> +	return 0;
> +}
> +
> +static int lpg_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np;
> +	struct lpg *lpg;
> +	int ret;
> +	int i;
> +
> +	lpg = devm_kzalloc(&pdev->dev, sizeof(*lpg), GFP_KERNEL);
> +	if (!lpg)
> +		return -ENOMEM;
> +
> +	lpg->data = of_device_get_match_data(&pdev->dev);
> +	if (!lpg->data)
> +		return -EINVAL;
> +
> +	lpg->dev = &pdev->dev;
> +
> +	lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!lpg->map) {
> +		dev_err(&pdev->dev, "parent regmap unavailable\n");
> +		return -ENXIO;
> +	}
> +
> +	ret = lpg_init_channels(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_parse_dtest(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_init_triled(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_init_lut(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	for_each_available_child_of_node(pdev->dev.of_node, np) {
> +		ret = lpg_add_led(lpg, np);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	for (i = 0; i < lpg->num_channels; i++)
> +		lpg_apply_dtest(&lpg->channels[i]);
> +
> +	ret = lpg_add_pwm(lpg);
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, lpg);
> +
> +	return 0;
> +}
> +
> +static int lpg_remove(struct platform_device *pdev)
> +{
> +	struct lpg *lpg = platform_get_drvdata(pdev);
> +
> +	pwmchip_remove(&lpg->pwm);
> +
> +	return 0;
> +}
> +
> +static const struct lpg_data pm8916_pwm_data = {
> +	.pwm_9bit_mask = BIT(2),
> +
> +	.num_channels = 1,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xbc00 },
> +	},
> +};
> +
> +static const struct lpg_data pm8941_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 64,
> +
> +	.triled_base = 0xd000,
> +	.triled_has_atc_ctl = true,
> +	.triled_has_src_sel = true,
> +
> +	.pwm_9bit_mask = 3 << 4,
> +
> +	.num_channels = 8,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300 },
> +		{ .base = 0xb400 },
> +		{ .base = 0xb500, .triled_mask = BIT(5) },
> +		{ .base = 0xb600, .triled_mask = BIT(6) },
> +		{ .base = 0xb700, .triled_mask = BIT(7) },
> +		{ .base = 0xb800 },
> +	},
> +};
> +
> +static const struct lpg_data pm8994_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 64,
> +
> +	.pwm_9bit_mask = 3 << 4,
> +
> +	.num_channels = 6,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300 },
> +		{ .base = 0xb400 },
> +		{ .base = 0xb500 },
> +		{ .base = 0xb600 },
> +	},
> +};
> +
> +static const struct lpg_data pmi8994_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 24,
> +
> +	.triled_base = 0xd000,
> +	.triled_has_atc_ctl = true,
> +	.triled_has_src_sel = true,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 4,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(5) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +		{ .base = 0xb300, .triled_mask = BIT(7) },
> +		{ .base = 0xb400 },
> +	},
> +};
> +
> +static const struct lpg_data pmi8998_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 6,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300, .triled_mask = BIT(5) },
> +		{ .base = 0xb400, .triled_mask = BIT(6) },
> +		{ .base = 0xb500, .triled_mask = BIT(7) },
> +		{ .base = 0xb600 },
> +	},
> +};
> +
> +static const struct lpg_data pm8150b_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,


For the LED peripheral under PM8150B we've some quirks. If one of the channels is enabled, then we need to do an additional SDAM register write to trigger a PBS (programmable boot sequence).

This is required to set the headroom voltage of BOB peripheral that is on PM8150L PMIC. When both the LED channels are disabled, a similar register write has to be made

again to trigger the PBS again to unvote the headroom voltage request made before.


> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 2,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(7) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +	},
> +};
> +
> +static const struct lpg_data pm8150l_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 5,


Not a big concern but I'm wondering how to represent 2 different blocks of HW from a PMIC here. First one is a LPG peripheral with 3 channels starting from 0xb100 which is consumed for TRI_LED.

Second one is a PWM peripheral with 2 channel starting from 0xbc00 which can never use LUT specified above. Looks like here you want to represent them as a whole. But in the case, if

an user wants to use the PWM channel (not a LPG channel) along with LUT, it shouldn't be supported. Can this be enforced by allowing LUT to be configured only for a peripheral of subtype LPG?


> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(7) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +		{ .base = 0xb300, .triled_mask = BIT(5) },
> +		{ .base = 0xbc00 },
> +		{ .base = 0xbd00 },
> +
> +	},
> +};
> +
> +static const struct of_device_id lpg_of_table[] = {
> +	{ .compatible = "qcom,pm8150b-lpg", .data = &pm8150b_lpg_data },
> +	{ .compatible = "qcom,pm8150l-lpg", .data = &pm8150l_lpg_data },
> +	{ .compatible = "qcom,pm8916-pwm", .data = &pm8916_pwm_data },
> +	{ .compatible = "qcom,pm8941-lpg", .data = &pm8941_lpg_data },
> +	{ .compatible = "qcom,pm8994-lpg", .data = &pm8994_lpg_data },
> +	{ .compatible = "qcom,pmi8994-lpg", .data = &pmi8994_lpg_data },
> +	{ .compatible = "qcom,pmi8998-lpg", .data = &pmi8998_lpg_data },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, lpg_of_table);
> +
> +static struct platform_driver lpg_driver = {
> +	.probe = lpg_probe,
> +	.remove = lpg_remove,
> +	.driver = {
> +		.name = "qcom-spmi-lpg",
> +		.of_match_table = lpg_of_table,
> +	},
> +};
> +module_platform_driver(lpg_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm LPG LED driver");
> +MODULE_LICENSE("GPL v2");
diff mbox series

Patch

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 49d99cb084db..8ab06b3f162d 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -933,6 +933,9 @@  source "drivers/leds/blink/Kconfig"
 comment "Flash and Torch LED drivers"
 source "drivers/leds/flash/Kconfig"
 
+comment "RGB LED drivers"
+source "drivers/leds/rgb/Kconfig"
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7e604d3028c8..8cad0465aae0 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -106,6 +106,9 @@  obj-$(CONFIG_LEDS_USER)			+= uleds.o
 # Flash and Torch LED Drivers
 obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
 
+# RGB LED Drivers
+obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/
+
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/
 
diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
new file mode 100644
index 000000000000..c68233b43c2c
--- /dev/null
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -0,0 +1,1286 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017-2021 Linaro Ltd
+ * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
+ */
+#include <linux/bits.h>
+#include <linux/led-class-multicolor.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define LPG_PATTERN_CONFIG_REG	0x40
+#define LPG_SIZE_CLK_REG	0x41
+#define LPG_PREDIV_CLK_REG	0x42
+#define PWM_TYPE_CONFIG_REG	0x43
+#define PWM_VALUE_REG		0x44
+#define PWM_ENABLE_CONTROL_REG	0x46
+#define PWM_SYNC_REG		0x47
+#define LPG_RAMP_DURATION_REG	0x50
+#define LPG_HI_PAUSE_REG	0x52
+#define LPG_LO_PAUSE_REG	0x54
+#define LPG_HI_IDX_REG		0x56
+#define LPG_LO_IDX_REG		0x57
+#define PWM_SEC_ACCESS_REG	0xd0
+#define PWM_DTEST_REG(x)	(0xe2 + (x) - 1)
+
+#define TRI_LED_SRC_SEL		0x45
+#define TRI_LED_EN_CTL		0x46
+#define TRI_LED_ATC_CTL		0x47
+
+#define LPG_LUT_REG(x)		(0x40 + (x) * 2)
+#define RAMP_CONTROL_REG	0xc8
+
+struct lpg_channel;
+struct lpg_data;
+
+/**
+ * struct lpg - LPG device context
+ * @dev:	struct device for LPG device
+ * @map:	regmap for register access
+ * @pwm:	PWM-chip object, if operating in PWM mode
+ * @lut_base:	base address of the LUT block (optional)
+ * @lut_size:	number of entries in the LUT block
+ * @lut_bitmap:	allocation bitmap for LUT entries
+ * @triled_base: base address of the TRILED block (optional)
+ * @triled_src:	power-source for the TRILED
+ * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
+ * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
+ * @channels:	list of PWM channels
+ * @num_channels: number of @channels
+ */
+struct lpg {
+	struct device *dev;
+	struct regmap *map;
+
+	struct pwm_chip pwm;
+
+	const struct lpg_data *data;
+
+	u32 lut_base;
+	u32 lut_size;
+	unsigned long *lut_bitmap;
+
+	u32 triled_base;
+	u32 triled_src;
+	bool triled_has_atc_ctl;
+	bool triled_has_src_sel;
+
+	struct lpg_channel *channels;
+	unsigned int num_channels;
+};
+
+/**
+ * struct lpg_channel - per channel data
+ * @lpg:	reference to parent lpg
+ * @base:	base address of the PWM channel
+ * @triled_mask: mask in TRILED to enable this channel
+ * @lut_mask:	mask in LUT to start pattern generator for this channel
+ * @in_use:	channel is exposed to LED framework
+ * @color:	color of the LED attached to this channel
+ * @dtest_line:	DTEST line for output, or 0 if disabled
+ * @dtest_value: DTEST line configuration
+ * @pwm_value:	duty (in microseconds) of the generated pulses, overridden by LUT
+ * @enabled:	output enabled?
+ * @period_us:	period (in microseconds) of the generated pulses
+ * @pwm_size:	resolution of the @pwm_value, 6 or 9 bits
+ * @clk:	base frequency of the clock generator
+ * @pre_div:	divider of @clk
+ * @pre_div_exp: exponential divider of @clk
+ * @ramp_enabled: duty cycle is driven by iterating over lookup table
+ * @ramp_ping_pong: reverse through pattern, rather than wrapping to start
+ * @ramp_oneshot: perform only a single pass over the pattern
+ * @ramp_reverse: iterate over pattern backwards
+ * @ramp_tick_ms: length (in milliseconds) of one step in the pattern
+ * @ramp_lo_pause_ms: pause (in milliseconds) before iterating over pattern
+ * @ramp_hi_pause_ms: pause (in milliseconds) after iterating over pattern
+ * @pattern_lo_idx: start index of associated pattern
+ * @pattern_hi_idx: last index of associated pattern
+ */
+struct lpg_channel {
+	struct lpg *lpg;
+
+	u32 base;
+	unsigned int triled_mask;
+	unsigned int lut_mask;
+
+	bool in_use;
+
+	int color;
+
+	u32 dtest_line;
+	u32 dtest_value;
+
+	u16 pwm_value;
+	bool enabled;
+
+	unsigned int period_us;
+	unsigned int pwm_size;
+	unsigned int clk;
+	unsigned int pre_div;
+	unsigned int pre_div_exp;
+
+	bool ramp_enabled;
+	bool ramp_ping_pong;
+	bool ramp_oneshot;
+	bool ramp_reverse;
+	unsigned long ramp_tick_ms;
+	unsigned long ramp_lo_pause_ms;
+	unsigned long ramp_hi_pause_ms;
+
+	unsigned int pattern_lo_idx;
+	unsigned int pattern_hi_idx;
+};
+
+/**
+ * struct lpg_led - logical LED object
+ * @lpg:		lpg context reference
+ * @cdev:		LED class device
+ * @mcdev:		Multicolor LED class device
+ * @num_channels:	number of @channels
+ * @channels:		list of channels associated with the LED
+ */
+struct lpg_led {
+	struct lpg *lpg;
+
+	struct led_classdev cdev;
+	struct led_classdev_mc mcdev;
+
+	unsigned int num_channels;
+	struct lpg_channel *channels[];
+};
+
+/**
+ * struct lpg_channel_data - per channel initialization data
+ * @base:		base address for PWM channel registers
+ * @triled_mask:	bitmask for controlling this channel in TRILED
+ */
+struct lpg_channel_data {
+	unsigned int base;
+	u8 triled_mask;
+};
+
+/**
+ * struct lpg_data - initialization data
+ * @lut_base:		base address of LUT block
+ * @lut_size:		number of entries in LUT
+ * @triled_base:	base address of TRILED
+ * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
+ * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
+ * @pwm_9bit_mask:	bitmask for switching from 6bit to 9bit pwm
+ * @num_channels:	number of channels in LPG
+ * @channels:		list of channel initialization data
+ */
+struct lpg_data {
+	unsigned int lut_base;
+	unsigned int lut_size;
+	unsigned int triled_base;
+	bool triled_has_atc_ctl;
+	bool triled_has_src_sel;
+	unsigned int pwm_9bit_mask;
+	int num_channels;
+	struct lpg_channel_data *channels;
+};
+
+static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
+{
+	/* Skip if we don't have a triled block */
+	if (!lpg->triled_base)
+		return 0;
+
+	return regmap_update_bits(lpg->map, lpg->triled_base + TRI_LED_EN_CTL,
+				  mask, enable);
+}
+
+static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
+			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
+{
+	unsigned int idx;
+	u16 val;
+	int i;
+
+	/* Hardware does not behave when LO_IDX == HI_IDX */
+	if (len == 1)
+		return -EINVAL;
+
+	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
+					 0, len, 0);
+	if (idx >= lpg->lut_size)
+		return -ENOMEM;
+
+	for (i = 0; i < len; i++) {
+		val = pattern[i].brightness;
+
+		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);
+	}
+
+	bitmap_set(lpg->lut_bitmap, idx, len);
+
+	*lo_idx = idx;
+	*hi_idx = idx + len - 1;
+
+	return 0;
+}
+
+static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_idx)
+{
+	int len;
+
+	if (lo_idx == hi_idx)
+		return;
+
+	len = hi_idx - lo_idx + 1;
+	bitmap_clear(lpg->lut_bitmap, lo_idx, len);
+}
+
+static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
+{
+	return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
+}
+
+#define NUM_PWM_PREDIV	4
+#define NUM_PWM_CLK	3
+#define NUM_EXP		7
+
+static const unsigned int lpg_clk_table[NUM_PWM_PREDIV][NUM_PWM_CLK] = {
+	{
+		1 * (NSEC_PER_SEC / 1024),
+		1 * (NSEC_PER_SEC / 32768),
+		1 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		3 * (NSEC_PER_SEC / 1024),
+		3 * (NSEC_PER_SEC / 32768),
+		3 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		5 * (NSEC_PER_SEC / 1024),
+		5 * (NSEC_PER_SEC / 32768),
+		5 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		6 * (NSEC_PER_SEC / 1024),
+		6 * (NSEC_PER_SEC / 32768),
+		6 * (NSEC_PER_SEC / 19200000),
+	},
+};
+
+/*
+ * PWM Frequency = Clock Frequency / (N * T)
+ *      or
+ * PWM Period = Clock Period * (N * T)
+ *      where
+ * N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
+ * T = Pre-divide * 2^m, where m = 0..7 (exponent)
+ *
+ * This is the formula to figure out m for the best pre-divide and clock:
+ * (PWM Period / N) = (Pre-divide * Clock Period) * 2^m
+ */
+static void lpg_calc_freq(struct lpg_channel *chan, unsigned int period_us)
+{
+	int             n, m, clk, div;
+	int             best_m, best_div, best_clk;
+	unsigned int    last_err, cur_err, min_err;
+	unsigned int    tmp_p, period_n;
+
+	if (period_us == chan->period_us)
+		return;
+
+	/* PWM Period / N */
+	if (period_us < UINT_MAX / NSEC_PER_USEC)
+		n = 6;
+	else
+		n = 9;
+
+	period_n = ((u64)period_us * NSEC_PER_USEC) >> n;
+
+	min_err = UINT_MAX;
+	last_err = UINT_MAX;
+	best_m = 0;
+	best_clk = 0;
+	best_div = 0;
+	for (clk = 0; clk < NUM_PWM_CLK; clk++) {
+		for (div = 0; div < NUM_PWM_PREDIV; div++) {
+			/* period_n = (PWM Period / N) */
+			/* tmp_p = (Pre-divide * Clock Period) * 2^m */
+			tmp_p = lpg_clk_table[div][clk];
+			for (m = 0; m <= NUM_EXP; m++) {
+				cur_err = abs(period_n - tmp_p);
+				if (cur_err < min_err) {
+					min_err = cur_err;
+					best_m = m;
+					best_clk = clk;
+					best_div = div;
+				}
+
+				if (m && cur_err > last_err)
+					/* Break for bigger cur_err */
+					break;
+
+				last_err = cur_err;
+				tmp_p <<= 1;
+			}
+		}
+	}
+
+	/* Use higher resolution */
+	if (best_m >= 3 && n == 6) {
+		n += 3;
+		best_m -= 3;
+	}
+
+	chan->clk = best_clk;
+	chan->pre_div = best_div;
+	chan->pre_div_exp = best_m;
+	chan->pwm_size = n;
+
+	chan->period_us = period_us;
+}
+
+static void lpg_calc_duty(struct lpg_channel *chan, unsigned int duty_us)
+{
+	unsigned int max = (1 << chan->pwm_size) - 1;
+	unsigned int val = div_u64((u64)duty_us << chan->pwm_size, chan->period_us);
+
+	chan->pwm_value = min(val, max);
+}
+
+static void lpg_apply_freq(struct lpg_channel *chan)
+{
+	unsigned long val;
+	struct lpg *lpg = chan->lpg;
+
+	if (!chan->enabled)
+		return;
+
+	/* Clock register values are off-by-one from lpg_clk_table */
+	val = chan->clk + 1;
+
+	if (chan->pwm_size == 9)
+		val |= lpg->data->pwm_9bit_mask;
+
+	regmap_write(lpg->map, chan->base + LPG_SIZE_CLK_REG, val);
+
+	val = chan->pre_div << 5 | chan->pre_div_exp;
+	regmap_write(lpg->map, chan->base + LPG_PREDIV_CLK_REG, val);
+}
+
+#define LPG_ENABLE_GLITCH_REMOVAL	BIT(5)
+
+static void lpg_enable_glitch(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
+			   LPG_ENABLE_GLITCH_REMOVAL, 0);
+}
+
+static void lpg_disable_glitch(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
+			   LPG_ENABLE_GLITCH_REMOVAL,
+			   LPG_ENABLE_GLITCH_REMOVAL);
+}
+
+static void lpg_apply_pwm_value(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+	u16 val = chan->pwm_value;
+
+	if (!chan->enabled)
+		return;
+
+	regmap_bulk_write(lpg->map, chan->base + PWM_VALUE_REG, &val, 1);
+}
+
+#define LPG_PATTERN_CONFIG_LO_TO_HI	BIT(4)
+#define LPG_PATTERN_CONFIG_REPEAT	BIT(3)
+#define LPG_PATTERN_CONFIG_TOGGLE	BIT(2)
+#define LPG_PATTERN_CONFIG_PAUSE_HI	BIT(1)
+#define LPG_PATTERN_CONFIG_PAUSE_LO	BIT(0)
+
+static void lpg_apply_lut_control(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+	unsigned int hi_pause;
+	unsigned int lo_pause;
+	unsigned int step;
+	unsigned int conf = 0;
+	unsigned int lo_idx = chan->pattern_lo_idx;
+	unsigned int hi_idx = chan->pattern_hi_idx;
+	int pattern_len;
+
+	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
+		return;
+
+	pattern_len = hi_idx - lo_idx + 1;
+
+	step = chan->ramp_tick_ms;
+	hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, step);
+	lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, step);
+
+	if (!chan->ramp_reverse)
+		conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
+	if (!chan->ramp_oneshot)
+		conf |= LPG_PATTERN_CONFIG_REPEAT;
+	if (chan->ramp_ping_pong)
+		conf |= LPG_PATTERN_CONFIG_TOGGLE;
+	if (chan->ramp_hi_pause_ms)
+		conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
+	if (chan->ramp_lo_pause_ms)
+		conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
+
+	regmap_write(lpg->map, chan->base + LPG_PATTERN_CONFIG_REG, conf);
+	regmap_write(lpg->map, chan->base + LPG_HI_IDX_REG, hi_idx);
+	regmap_write(lpg->map, chan->base + LPG_LO_IDX_REG, lo_idx);
+
+	regmap_write(lpg->map, chan->base + LPG_RAMP_DURATION_REG, step);
+	regmap_write(lpg->map, chan->base + LPG_HI_PAUSE_REG, hi_pause);
+	regmap_write(lpg->map, chan->base + LPG_LO_PAUSE_REG, lo_pause);
+}
+
+#define LPG_ENABLE_CONTROL_OUTPUT		BIT(7)
+#define LPG_ENABLE_CONTROL_BUFFER_TRISTATE	BIT(5)
+#define LPG_ENABLE_CONTROL_SRC_PWM		BIT(2)
+#define LPG_ENABLE_CONTROL_RAMP_GEN		BIT(1)
+
+static void lpg_apply_control(struct lpg_channel *chan)
+{
+	unsigned int ctrl;
+	struct lpg *lpg = chan->lpg;
+
+	ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
+
+	if (chan->enabled)
+		ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
+
+	if (chan->pattern_lo_idx != chan->pattern_hi_idx)
+		ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
+	else
+		ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
+
+	regmap_write(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, ctrl);
+
+	/*
+	 * Due to LPG hardware bug, in the PWM mode, having enabled PWM,
+	 * We have to write PWM values one more time.
+	 */
+	if (chan->enabled)
+		lpg_apply_pwm_value(chan);
+}
+
+#define LPG_SYNC_PWM	BIT(0)
+
+static void lpg_apply_sync(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_write(lpg->map, chan->base + PWM_SYNC_REG, LPG_SYNC_PWM);
+}
+
+static int lpg_parse_dtest(struct lpg *lpg)
+{
+	struct lpg_channel *chan;
+	struct device_node *np = lpg->dev->of_node;
+	int count;
+	int ret;
+	int i;
+
+	count = of_property_count_u32_elems(np, "qcom,dtest");
+	if (count == -EINVAL) {
+		return 0;
+	} else if (count < 0) {
+		ret = count;
+		goto err_malformed;
+	} else if (count != lpg->data->num_channels * 2) {
+		dev_err(lpg->dev, "qcom,dtest needs to be %d items\n",
+			lpg->data->num_channels * 2);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < lpg->data->num_channels; i++) {
+		chan = &lpg->channels[i];
+
+		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2,
+						 &chan->dtest_line);
+		if (ret)
+			goto err_malformed;
+
+		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2 + 1,
+						 &chan->dtest_value);
+		if (ret)
+			goto err_malformed;
+	}
+
+	return 0;
+
+err_malformed:
+	dev_err(lpg->dev, "malformed qcom,dtest\n");
+	return ret;
+}
+
+static void lpg_apply_dtest(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	if (!chan->dtest_line)
+		return;
+
+	regmap_write(lpg->map, chan->base + PWM_SEC_ACCESS_REG, 0xa5);
+	regmap_write(lpg->map, chan->base + PWM_DTEST_REG(chan->dtest_line),
+		     chan->dtest_value);
+}
+
+static void lpg_apply(struct lpg_channel *chan)
+{
+	lpg_disable_glitch(chan);
+	lpg_apply_freq(chan);
+	lpg_apply_pwm_value(chan);
+	lpg_apply_control(chan);
+	lpg_apply_sync(chan);
+	lpg_apply_lut_control(chan);
+	lpg_enable_glitch(chan);
+}
+
+static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
+			       struct mc_subled *subleds)
+{
+	enum led_brightness brightness;
+	struct lpg_channel *chan;
+	unsigned int triled_enabled = 0;
+	unsigned int triled_mask = 0;
+	unsigned int lut_mask = 0;
+	unsigned int duty_us;
+	struct lpg *lpg = led->lpg;
+	int i;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+		brightness = subleds[i].brightness;
+
+		if (brightness == LED_OFF) {
+			chan->enabled = false;
+			chan->ramp_enabled = false;
+		} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
+			lpg_calc_freq(chan, NSEC_PER_USEC);
+
+			chan->enabled = true;
+			chan->ramp_enabled = true;
+
+			lut_mask |= chan->lut_mask;
+			triled_enabled |= chan->triled_mask;
+		} else {
+			lpg_calc_freq(chan, NSEC_PER_USEC);
+
+			duty_us = brightness * chan->period_us / cdev->max_brightness;
+			lpg_calc_duty(chan, duty_us);
+			chan->enabled = true;
+			chan->ramp_enabled = false;
+
+			triled_enabled |= chan->triled_mask;
+		}
+
+		triled_mask |= chan->triled_mask;
+
+		lpg_apply(chan);
+	}
+
+	/* Toggle triled lines */
+	if (triled_mask)
+		triled_set(lpg, triled_mask, triled_enabled);
+
+	/* Trigger start of ramp generator(s) */
+	if (lut_mask)
+		lpg_lut_sync(lpg, lut_mask);
+}
+
+static void lpg_brightness_single_set(struct led_classdev *cdev,
+				      enum led_brightness value)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+	struct mc_subled info;
+
+	info.brightness = value;
+	lpg_brightness_set(led, cdev, &info);
+}
+
+static void lpg_brightness_mc_set(struct led_classdev *cdev,
+				  enum led_brightness value)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	led_mc_calc_color_components(mc, value);
+	lpg_brightness_set(led, cdev, mc->subled_info);
+}
+
+static int lpg_blink_set(struct lpg_led *led,
+			 unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct lpg_channel *chan;
+	unsigned int period_us;
+	unsigned int duty_us;
+	int i;
+
+	if (!*delay_on && !*delay_off) {
+		*delay_on = 500;
+		*delay_off = 500;
+	}
+
+	duty_us = *delay_on * USEC_PER_MSEC;
+	period_us = (*delay_on + *delay_off) * USEC_PER_MSEC;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+
+		lpg_calc_freq(chan, period_us);
+		lpg_calc_duty(chan, duty_us);
+
+		chan->enabled = true;
+		chan->ramp_enabled = false;
+
+		lpg_apply(chan);
+	}
+
+	return 0;
+}
+
+static int lpg_blink_single_set(struct led_classdev *cdev,
+				unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+
+	return lpg_blink_set(led, delay_on, delay_off);
+}
+
+static int lpg_blink_mc_set(struct led_classdev *cdev,
+			    unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	return lpg_blink_set(led, delay_on, delay_off);
+}
+
+static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *pattern,
+			   u32 len, int repeat)
+{
+	struct lpg_channel *chan;
+	struct lpg *lpg = led->lpg;
+	unsigned int hi_pause;
+	unsigned int lo_pause;
+	unsigned int lo_idx;
+	unsigned int hi_idx;
+	bool ping_pong = true;
+	int brightness_a;
+	int brightness_b;
+	int ret;
+	int i;
+
+	/* Only support oneshot or indefinite loops, due to limited pattern space */
+	if (repeat != -1 && repeat != 1)
+		return -EINVAL;
+
+	/*
+	 * The LPG plays patterns with at a fixed pace, a "low pause" can be
+	 * performed before the pattern and a "high pause" after. In order to
+	 * save space the pattern can be played in "ping pong" mode, in which
+	 * the pattern is first played forward, then "high pause" is applied,
+	 * then the pattern is played backwards and finally the "low pause" is
+	 * applied.
+	 *
+	 * The delta_t of the first entry is used to determine the pace of the
+	 * pattern.
+	 *
+	 * If the specified pattern is a palindrome the ping pong mode is
+	 * enabled. In this scenario the delta_t of the last entry determines
+	 * the "low pause" time and the delta_t of the middle entry (i.e. the
+	 * last in the programmed pattern) determines the "high pause". If the
+	 * pattern consists of an odd number of values, no "high pause" is
+	 * used.
+	 *
+	 * When ping pong mode is not selected, the delta_t of the last entry
+	 * is used as "high pause". No "low pause" is used.
+	 *
+	 * delta_t of any other members of the pattern is ignored.
+	 */
+
+	/* Detect palindromes and use "ping pong" to reduce LUT usage */
+	for (i = 0; i < len / 2; i++) {
+		brightness_a = pattern[i].brightness;
+		brightness_b = pattern[len - i - 1].brightness;
+
+		if (brightness_a != brightness_b) {
+			ping_pong = false;
+			break;
+		}
+	}
+
+	if (ping_pong) {
+		if (len % 2)
+			hi_pause = 0;
+		else
+			hi_pause = pattern[(len + 1) / 2].delta_t;
+		lo_pause = pattern[len - 1].delta_t;
+
+		len = (len + 1) / 2;
+	} else {
+		hi_pause = pattern[len - 1].delta_t;
+		lo_pause = 0;
+	}
+
+	ret = lpg_lut_store(lpg, pattern, len, &lo_idx, &hi_idx);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+
+		chan->ramp_tick_ms = pattern[0].delta_t;
+		chan->ramp_ping_pong = ping_pong;
+		chan->ramp_oneshot = repeat != -1;
+
+		chan->ramp_lo_pause_ms = lo_pause;
+		chan->ramp_hi_pause_ms = hi_pause;
+
+		chan->pattern_lo_idx = lo_idx;
+		chan->pattern_hi_idx = hi_idx;
+	}
+
+	return 0;
+}
+
+static int lpg_pattern_single_set(struct led_classdev *cdev,
+				  struct led_pattern *pattern, u32 len,
+				  int repeat)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+	int ret;
+
+	ret = lpg_pattern_set(led, pattern, len, repeat);
+	if (ret < 0)
+		return ret;
+
+	lpg_brightness_single_set(cdev, LED_FULL);
+
+	return 0;
+}
+
+static int lpg_pattern_mc_set(struct led_classdev *cdev,
+			      struct led_pattern *pattern, u32 len,
+			      int repeat)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+	int ret;
+
+	ret = lpg_pattern_set(led, pattern, len, repeat);
+	if (ret < 0)
+		return ret;
+
+	led_mc_calc_color_components(mc, LED_FULL);
+	lpg_brightness_set(led, cdev, mc->subled_info);
+
+	return 0;
+}
+
+static int lpg_pattern_clear(struct lpg_led *led)
+{
+	struct lpg_channel *chan;
+	struct lpg *lpg = led->lpg;
+	int i;
+
+	chan = led->channels[0];
+	lpg_lut_free(lpg, chan->pattern_lo_idx, chan->pattern_hi_idx);
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+		chan->pattern_lo_idx = 0;
+		chan->pattern_hi_idx = 0;
+	}
+
+	return 0;
+}
+
+static int lpg_pattern_single_clear(struct led_classdev *cdev)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+
+	return lpg_pattern_clear(led);
+}
+
+static int lpg_pattern_mc_clear(struct led_classdev *cdev)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	return lpg_pattern_clear(led);
+}
+
+static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct lpg *lpg = container_of(chip, struct lpg, pwm);
+	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
+
+	return chan->in_use ? -EBUSY : 0;
+}
+
+static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			 const struct pwm_state *state)
+{
+	struct lpg *lpg = container_of(chip, struct lpg, pwm);
+	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
+
+	lpg_calc_freq(chan, div_u64(state->period, NSEC_PER_USEC));
+	lpg_calc_duty(chan, div_u64(state->duty_cycle, NSEC_PER_USEC));
+	chan->enabled = state->enabled;
+
+	lpg_apply(chan);
+
+	triled_set(lpg, chan->triled_mask, chan->enabled ? chan->triled_mask : 0);
+
+	return 0;
+}
+
+static const struct pwm_ops lpg_pwm_ops = {
+	.request = lpg_pwm_request,
+	.apply = lpg_pwm_apply,
+	.owner = THIS_MODULE,
+};
+
+static int lpg_add_pwm(struct lpg *lpg)
+{
+	int ret;
+
+	lpg->pwm.base = -1;
+	lpg->pwm.dev = lpg->dev;
+	lpg->pwm.npwm = lpg->num_channels;
+	lpg->pwm.ops = &lpg_pwm_ops;
+
+	ret = pwmchip_add(&lpg->pwm);
+	if (ret)
+		dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret);
+
+	return ret;
+}
+
+static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
+			     struct lpg_channel **channel)
+{
+	struct lpg_channel *chan;
+	u32 color = LED_COLOR_ID_GREEN;
+	u32 reg;
+	int ret;
+
+	ret = of_property_read_u32(np, "reg", &reg);
+	if (ret || !reg || reg > lpg->num_channels) {
+		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);
+		return -EINVAL;
+	}
+
+	chan = &lpg->channels[reg - 1];
+	chan->in_use = true;
+
+	ret = of_property_read_u32(np, "color", &color);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
+		return ret;
+	}
+
+	chan->color = color;
+
+	*channel = chan;
+
+	return 0;
+}
+
+static int lpg_add_led(struct lpg *lpg, struct device_node *np)
+{
+	struct led_classdev *cdev;
+	struct device_node *child;
+	struct mc_subled *info;
+	struct lpg_led *led;
+	const char *state;
+	int num_channels;
+	u32 color = 0;
+	int ret;
+	int i;
+
+	ret = of_property_read_u32(np, "color", &color);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
+		return ret;
+	}
+
+	if (color == LED_COLOR_ID_MULTI)
+		num_channels = of_get_available_child_count(np);
+	else
+		num_channels = 1;
+
+	led = devm_kzalloc(lpg->dev, struct_size(led, channels, num_channels), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->lpg = lpg;
+	led->num_channels = num_channels;
+
+	if (color == LED_COLOR_ID_MULTI) {
+		info = devm_kcalloc(lpg->dev, num_channels, sizeof(*info), GFP_KERNEL);
+		if (!info)
+			return -ENOMEM;
+		i = 0;
+		for_each_available_child_of_node(np, child) {
+			ret = lpg_parse_channel(lpg, child, &led->channels[i]);
+			if (ret < 0)
+				return ret;
+
+			info[i].color_index = led->channels[i]->color;
+			info[i].intensity = LED_FULL;
+			i++;
+		}
+
+		led->mcdev.subled_info = info;
+		led->mcdev.num_colors = num_channels;
+
+		cdev = &led->mcdev.led_cdev;
+		cdev->brightness_set = lpg_brightness_mc_set;
+		cdev->blink_set = lpg_blink_mc_set;
+
+		/* Register pattern accessors only if we have a LUT block */
+		if (lpg->lut_base) {
+			cdev->pattern_set = lpg_pattern_mc_set;
+			cdev->pattern_clear = lpg_pattern_mc_clear;
+		}
+	} else {
+		ret = lpg_parse_channel(lpg, np, &led->channels[0]);
+		if (ret < 0)
+			return ret;
+
+		cdev = &led->cdev;
+		cdev->brightness_set = lpg_brightness_single_set;
+		cdev->blink_set = lpg_blink_single_set;
+
+		/* Register pattern accessors only if we have a LUT block */
+		if (lpg->lut_base) {
+			cdev->pattern_set = lpg_pattern_single_set;
+			cdev->pattern_clear = lpg_pattern_single_clear;
+		}
+	}
+
+	/* Use label else node name */
+	cdev->name = of_get_property(np, "label", NULL) ? : np->name;
+	cdev->default_trigger = of_get_property(np, "linux,default-trigger", NULL);
+	cdev->max_brightness = 255;
+
+	if (!of_property_read_string(np, "default-state", &state) &&
+	    !strcmp(state, "on"))
+		cdev->brightness = LED_FULL;
+	else
+		cdev->brightness = LED_OFF;
+
+	cdev->brightness_set(cdev, cdev->brightness);
+
+	if (color == LED_COLOR_ID_MULTI)
+		ret = devm_led_classdev_multicolor_register(lpg->dev, &led->mcdev);
+	else
+		ret = devm_led_classdev_register(lpg->dev, &led->cdev);
+	if (ret)
+		dev_err(lpg->dev, "unable to register %s\n", cdev->name);
+
+	return ret;
+}
+
+static int lpg_init_channels(struct lpg *lpg)
+{
+	const struct lpg_data *data = lpg->data;
+	int i;
+
+	lpg->num_channels = data->num_channels;
+	lpg->channels = devm_kcalloc(lpg->dev, data->num_channels,
+				     sizeof(struct lpg_channel), GFP_KERNEL);
+	if (!lpg->channels)
+		return -ENOMEM;
+
+	for (i = 0; i < data->num_channels; i++) {
+		lpg->channels[i].lpg = lpg;
+		lpg->channels[i].base = data->channels[i].base;
+		lpg->channels[i].triled_mask = data->channels[i].triled_mask;
+		lpg->channels[i].lut_mask = BIT(i);
+	}
+
+	return 0;
+}
+
+static int lpg_init_triled(struct lpg *lpg)
+{
+	struct device_node *np = lpg->dev->of_node;
+	int ret;
+
+	/* Skip initialization if we don't have a triled block */
+	if (!lpg->data->triled_base)
+		return 0;
+
+	lpg->triled_base = lpg->data->triled_base;
+	lpg->triled_has_atc_ctl = lpg->data->triled_has_atc_ctl;
+	lpg->triled_has_src_sel = lpg->data->triled_has_src_sel;
+
+	if (lpg->triled_has_src_sel) {
+		ret = of_property_read_u32(np, "qcom,power-source", &lpg->triled_src);
+		if (ret || lpg->triled_src == 2 || lpg->triled_src > 3) {
+			dev_err(lpg->dev, "invalid power source\n");
+			return -EINVAL;
+		}
+	}
+
+	/* Disable automatic trickle charge LED */
+	if (lpg->triled_has_atc_ctl)
+		regmap_write(lpg->map, lpg->triled_base + TRI_LED_ATC_CTL, 0);
+
+	/* Configure power source */
+	if (lpg->triled_has_src_sel)
+		regmap_write(lpg->map, lpg->triled_base + TRI_LED_SRC_SEL, lpg->triled_src);
+
+	/* Default all outputs to off */
+	regmap_write(lpg->map, lpg->triled_base + TRI_LED_EN_CTL, 0);
+
+	return 0;
+}
+
+static int lpg_init_lut(struct lpg *lpg)
+{
+	const struct lpg_data *data = lpg->data;
+	size_t bitmap_size;
+
+	if (!data->lut_base)
+		return 0;
+
+	lpg->lut_base = data->lut_base;
+	lpg->lut_size = data->lut_size;
+
+	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
+	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
+	if (!lpg->lut_bitmap)
+		return -ENOMEM;
+
+	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);
+
+	return 0;
+}
+
+static int lpg_probe(struct platform_device *pdev)
+{
+	struct device_node *np;
+	struct lpg *lpg;
+	int ret;
+	int i;
+
+	lpg = devm_kzalloc(&pdev->dev, sizeof(*lpg), GFP_KERNEL);
+	if (!lpg)
+		return -ENOMEM;
+
+	lpg->data = of_device_get_match_data(&pdev->dev);
+	if (!lpg->data)
+		return -EINVAL;
+
+	lpg->dev = &pdev->dev;
+
+	lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!lpg->map) {
+		dev_err(&pdev->dev, "parent regmap unavailable\n");
+		return -ENXIO;
+	}
+
+	ret = lpg_init_channels(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_parse_dtest(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_init_triled(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_init_lut(lpg);
+	if (ret < 0)
+		return ret;
+
+	for_each_available_child_of_node(pdev->dev.of_node, np) {
+		ret = lpg_add_led(lpg, np);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < lpg->num_channels; i++)
+		lpg_apply_dtest(&lpg->channels[i]);
+
+	ret = lpg_add_pwm(lpg);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, lpg);
+
+	return 0;
+}
+
+static int lpg_remove(struct platform_device *pdev)
+{
+	struct lpg *lpg = platform_get_drvdata(pdev);
+
+	pwmchip_remove(&lpg->pwm);
+
+	return 0;
+}
+
+static const struct lpg_data pm8916_pwm_data = {
+	.pwm_9bit_mask = BIT(2),
+
+	.num_channels = 1,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xbc00 },
+	},
+};
+
+static const struct lpg_data pm8941_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 64,
+
+	.triled_base = 0xd000,
+	.triled_has_atc_ctl = true,
+	.triled_has_src_sel = true,
+
+	.pwm_9bit_mask = 3 << 4,
+
+	.num_channels = 8,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300 },
+		{ .base = 0xb400 },
+		{ .base = 0xb500, .triled_mask = BIT(5) },
+		{ .base = 0xb600, .triled_mask = BIT(6) },
+		{ .base = 0xb700, .triled_mask = BIT(7) },
+		{ .base = 0xb800 },
+	},
+};
+
+static const struct lpg_data pm8994_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 64,
+
+	.pwm_9bit_mask = 3 << 4,
+
+	.num_channels = 6,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300 },
+		{ .base = 0xb400 },
+		{ .base = 0xb500 },
+		{ .base = 0xb600 },
+	},
+};
+
+static const struct lpg_data pmi8994_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 24,
+
+	.triled_base = 0xd000,
+	.triled_has_atc_ctl = true,
+	.triled_has_src_sel = true,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 4,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(5) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+		{ .base = 0xb300, .triled_mask = BIT(7) },
+		{ .base = 0xb400 },
+	},
+};
+
+static const struct lpg_data pmi8998_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 6,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300, .triled_mask = BIT(5) },
+		{ .base = 0xb400, .triled_mask = BIT(6) },
+		{ .base = 0xb500, .triled_mask = BIT(7) },
+		{ .base = 0xb600 },
+	},
+};
+
+static const struct lpg_data pm8150b_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 2,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(7) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+	},
+};
+
+static const struct lpg_data pm8150l_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 5,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(7) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+		{ .base = 0xb300, .triled_mask = BIT(5) },
+		{ .base = 0xbc00 },
+		{ .base = 0xbd00 },
+
+	},
+};
+
+static const struct of_device_id lpg_of_table[] = {
+	{ .compatible = "qcom,pm8150b-lpg", .data = &pm8150b_lpg_data },
+	{ .compatible = "qcom,pm8150l-lpg", .data = &pm8150l_lpg_data },
+	{ .compatible = "qcom,pm8916-pwm", .data = &pm8916_pwm_data },
+	{ .compatible = "qcom,pm8941-lpg", .data = &pm8941_lpg_data },
+	{ .compatible = "qcom,pm8994-lpg", .data = &pm8994_lpg_data },
+	{ .compatible = "qcom,pmi8994-lpg", .data = &pmi8994_lpg_data },
+	{ .compatible = "qcom,pmi8998-lpg", .data = &pmi8998_lpg_data },
+	{}
+};
+MODULE_DEVICE_TABLE(of, lpg_of_table);
+
+static struct platform_driver lpg_driver = {
+	.probe = lpg_probe,
+	.remove = lpg_remove,
+	.driver = {
+		.name = "qcom-spmi-lpg",
+		.of_match_table = lpg_of_table,
+	},
+};
+module_platform_driver(lpg_driver);
+
+MODULE_DESCRIPTION("Qualcomm LPG LED driver");
+MODULE_LICENSE("GPL v2");