| Message ID | 20180523115129.21674-2-dmurphy@ti.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v9,1/2] dt: bindings: lm3601x: Introduce the lm3601x driver | expand |
Hi Dan, Thank you for the updated set. On 05/23/2018 01:51 PM, Dan Murphy wrote: > Introduce the family of LED devices that can > drive a torch, strobe or IR LED. > > The LED driver can be configured with a strobe > timer to execute a strobe flash. The IR LED > brightness is controlled via the torch brightness > register. > > The data sheet for each the LM36010 and LM36011 > LED drivers can be found here: > http://www.ti.com/product/LM36010 > http://www.ti.com/product/LM36011 > > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> > Signed-off-by: Dan Murphy <dmurphy@ti.com> > --- > > v9 - Changed "strobe" to flash in some cases, removed some redundant variable > assignments, updated a couple of line to make them more readable, converted to > probe_new from old probe, and change err to ret - https://patchwork.kernel.org/patch/10418731/ > > v8 - Removed OF Kconfig dependency, change strobe to flash, updated label generation, > fixed brightness calculation, added mutex_destroy and flash_unregister - https://patchwork.kernel.org/patch/10416163/ > v7 - Numerous fixes to many to list. Highlights are moved from OF APIs to device_property > APIs, updated LED registration, timeout to reg algorithim, and fixed label generation - > https://patchwork.kernel.org/patch/10401437/ > v6 - This driver has been heavily modified from v5. There is no longer reading > of individual child nodes. There are too many changes to list here see - > https://patchwork.kernel.org/patch/10392123/ > v5 - Fixed magic numbers, change reg cache type, added of_put_node to release > the dt node ref, and I did not change the remove function to leave the LED in its > state on driver removal - https://patchwork.kernel.org/patch/10391741/ > v4 - Fixed Cocci issue using ARRAY_SIZE - https://patchwork.kernel.org/patch/10389259/ > v3 - removed wildcard dt compatible, fixed copyright, fixed struct doc, removed > RO registers from default, added regmap volatile for FLAGS_REG, updated regmap cache type, > fixed unlock and extra semi colon in strobe_set, removed unnecessary out label > in led register and fixed checking of the ret in brightness_set - https://patchwork.kernel.org/patch/10386243/ > v2 - Fixed kbuild issue and removed unused cdev_strobe - https://patchwork.kernel.org/patch/10384585/ > > drivers/leds/Kconfig | 9 + > drivers/leds/Makefile | 1 + > drivers/leds/leds-lm3601x.c | 487 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 497 insertions(+) > create mode 100644 drivers/leds/leds-lm3601x.c > > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig > index 2c896c0e69e1..d95d436e6089 100644 > --- a/drivers/leds/Kconfig > +++ b/drivers/leds/Kconfig > @@ -145,6 +145,15 @@ config LEDS_LM3692X > This option enables support for the TI LM3692x family > of white LED string drivers used for backlighting. > > +config LEDS_LM3601X > + tristate "LED support for LM3601x Chips" > + depends on LEDS_CLASS && I2C > + depends on LEDS_CLASS_FLASH > + select REGMAP_I2C > + help > + This option enables support for the TI LM3601x family > + of flash, torch and indicator classes. > + > config LEDS_LOCOMO > tristate "LED Support for Locomo device" > depends on LEDS_CLASS > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile > index 91eca81cae82..b79807fe1b67 100644 > --- a/drivers/leds/Makefile > +++ b/drivers/leds/Makefile > @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o > obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o > obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o > obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o > +obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o > > # LED SPI Drivers > obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o > diff --git a/drivers/leds/leds-lm3601x.c b/drivers/leds/leds-lm3601x.c > new file mode 100644 > index 000000000000..081aa71e43a3 > --- /dev/null > +++ b/drivers/leds/leds-lm3601x.c > @@ -0,0 +1,487 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Flash and torch driver for Texas Instruments LM3601X LED > +// Flash driver chip family > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/leds.h> > +#include <linux/led-class-flash.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > +#include <linux/slab.h> > +#include <uapi/linux/uleds.h> > + > +#define LM3601X_LED_IR 0x0 > +#define LM3601X_LED_TORCH 0x1 > + > +/* Registers */ > +#define LM3601X_ENABLE_REG 0x01 > +#define LM3601X_CFG_REG 0x02 > +#define LM3601X_LED_FLASH_REG 0x03 > +#define LM3601X_LED_TORCH_REG 0x04 > +#define LM3601X_FLAGS_REG 0x05 > +#define LM3601X_DEV_ID_REG 0x06 > + > +#define LM3601X_SW_RESET BIT(7) > + > +/* Enable Mode bits */ > +#define LM3601X_MODE_STANDBY 0x00 > +#define LM3601X_MODE_IR_DRV BIT(0) > +#define LM3601X_MODE_TORCH BIT(1) > +#define LM3601X_MODE_STROBE (BIT(0) | BIT(1)) > +#define LM3601X_STRB_EN BIT(2) > +#define LM3601X_STRB_EDGE_TRIG BIT(3) > +#define LM3601X_IVFM_EN BIT(4) > + > +#define LM36010_BOOST_LIMIT_28 BIT(5) > +#define LM36010_BOOST_FREQ_4MHZ BIT(6) > +#define LM36010_BOOST_MODE_PASS BIT(7) > + > +/* Flag Mask */ > +#define LM3601X_FLASH_TIME_OUT BIT(0) > +#define LM3601X_UVLO_FAULT BIT(1) > +#define LM3601X_THERM_SHUTDOWN BIT(2) > +#define LM3601X_THERM_CURR BIT(3) > +#define LM36010_CURR_LIMIT BIT(4) > +#define LM3601X_SHORT_FAULT BIT(5) > +#define LM3601X_IVFM_TRIP BIT(6) > +#define LM36010_OVP_FAULT BIT(7) > + > +#define LM3601X_MAX_TORCH_I_UA 376000 > +#define LM3601X_MIN_TORCH_I_UA 2400 > +#define LM3601X_TORCH_REG_DIV 2965 > + > +#define LM3601X_MAX_STROBE_I_UA 1500000 > +#define LM3601X_MIN_STROBE_I_UA 11000 > +#define LM3601X_STROBE_REG_DIV 11800 > + > +#define LM3601X_TIMEOUT_MASK 0x1e > +#define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH) > + > +#define LM3601X_LOWER_STEP_US 40000 > +#define LM3601X_UPPER_STEP_US 200000 > +#define LM3601X_MIN_TIMEOUT_US 40000 > +#define LM3601X_MAX_TIMEOUT_US 1600000 > +#define LM3601X_TIMEOUT_XOVER_US 400000 > + > +enum lm3601x_type { > + CHIP_LM36010 = 0, > + CHIP_LM36011, > +}; > + > +/** > + * struct lm3601x_led - > + * @fled_cdev: flash LED class device pointer > + * @client: Pointer to the I2C client > + * @regmap: Devices register map > + * @lock: Lock for reading/writing the device > + * @led_name: LED label for the Torch or IR LED > + * @flash_timeout: the timeout for the flash > + * @last_flag: last known flags register value > + * @torch_current_max: maximum current for the torch > + * @flash_current_max: maximum current for the flash > + * @max_flash_timeout: maximum timeout for the flash > + * @led_mode: The mode to enable either IR or Torch > + */ > +struct lm3601x_led { > + struct led_classdev_flash fled_cdev; > + struct i2c_client *client; > + struct regmap *regmap; > + struct mutex lock; > + > + char led_name[LED_MAX_NAME_SIZE]; > + > + unsigned int flash_timeout; > + unsigned int last_flag; > + > + u32 torch_current_max; > + u32 flash_current_max; > + u32 max_flash_timeout; > + > + u32 led_mode; > +}; > + > +static const struct reg_default lm3601x_regmap_defs[] = { > + { LM3601X_ENABLE_REG, 0x20 }, > + { LM3601X_CFG_REG, 0x15 }, > + { LM3601X_LED_FLASH_REG, 0x00 }, > + { LM3601X_LED_TORCH_REG, 0x00 }, > +}; > + > +static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg) > +{ > + switch (reg) { > + case LM3601X_FLAGS_REG: > + return true; > + default: > + return false; > + } > +} > + > +static const struct regmap_config lm3601x_regmap = { > + .reg_bits = 8, > + .val_bits = 8, > + > + .max_register = LM3601X_DEV_ID_REG, > + .reg_defaults = lm3601x_regmap_defs, > + .num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs), > + .cache_type = REGCACHE_RBTREE, > + .volatile_reg = lm3601x_volatile_reg, > +}; > + > +static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev) > +{ > + return container_of(fled_cdev, struct lm3601x_led, fled_cdev); > +} > + > +static int lm3601x_read_faults(struct lm3601x_led *led) > +{ > + int flags_val; > + int ret; > + > + ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val); > + if (ret < 0) > + return -EIO; > + > + led->last_flag = 0; > + > + if (flags_val & LM36010_OVP_FAULT) > + led->last_flag |= LED_FAULT_OVER_VOLTAGE; > + > + if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR)) > + led->last_flag |= LED_FAULT_OVER_TEMPERATURE; > + > + if (flags_val & LM3601X_SHORT_FAULT) > + led->last_flag |= LED_FAULT_SHORT_CIRCUIT; > + > + if (flags_val & LM36010_CURR_LIMIT) > + led->last_flag |= LED_FAULT_OVER_CURRENT; > + > + if (flags_val & LM3601X_UVLO_FAULT) > + led->last_flag |= LED_FAULT_UNDER_VOLTAGE; > + > + if (flags_val & LM3601X_IVFM_TRIP) > + led->last_flag |= LED_FAULT_INPUT_VOLTAGE; > + > + if (flags_val & LM3601X_THERM_SHUTDOWN) > + led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE; > + > + return led->last_flag; > +} > + > +static int lm3601x_brightness_set(struct led_classdev *cdev, > + enum led_brightness brightness) > +{ > + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev); > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int ret, led_mode_val; > + > + mutex_lock(&led->lock); > + > + ret = lm3601x_read_faults(led); > + if (ret < 0) > + goto out; > + > + if (led->led_mode == LM3601X_LED_TORCH) > + led_mode_val = LM3601X_MODE_TORCH; > + else > + led_mode_val = LM3601X_MODE_IR_DRV; > + > + if (brightness == LED_OFF) { > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + led_mode_val, LED_OFF); > + goto out; > + } > + > + ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness); > + if (ret < 0) > + goto out; > + > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, > + led_mode_val); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev, > + bool state) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int timeout_reg_val; > + int current_timeout; > + int ret; > + > + mutex_lock(&led->lock); > + > + ret = regmap_read(led->regmap, LM3601X_CFG_REG, ¤t_timeout); > + if (ret < 0) > + goto out; > + > + if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US) > + timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07; > + else > + timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01; > + > + if (led->flash_timeout != current_timeout) > + ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG, > + LM3601X_TIMEOUT_MASK, timeout_reg_val); > + > + if (state) > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, > + LM3601X_MODE_STROBE); > + else > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_STROBE, LED_OFF); > + > + ret = lm3601x_read_faults(led); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev, > + u32 brightness) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + u8 brightness_val; > + int ret; > + > + mutex_lock(&led->lock); > + ret = lm3601x_read_faults(led); > + if (ret < 0) > + goto out; > + > + if (brightness == LED_OFF) { > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_STROBE, LED_OFF); > + goto out; > + } > + > + brightness_val = brightness / LM3601X_STROBE_REG_DIV; > + > + ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev, > + u32 timeout) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + > + mutex_lock(&led->lock); > + > + led->flash_timeout = timeout; > + > + mutex_unlock(&led->lock); > + > + return 0; > +} > + > +static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int strobe_state; > + int ret; > + > + mutex_lock(&led->lock); > + > + ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state); > + if (ret < 0) > + goto out; > + > + *state = strobe_state & LM3601X_MODE_STROBE; > + > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev, > + u32 *fault) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + > + lm3601x_read_faults(led); > + > + *fault = led->last_flag; > + > + return 0; > +} > + > +static const struct led_flash_ops flash_ops = { > + .flash_brightness_set = lm3601x_flash_brightness_set, > + .strobe_set = lm3601x_strobe_set, > + .strobe_get = lm3601x_strobe_get, > + .timeout_set = lm3601x_flash_timeout_set, > + .fault_get = lm3601x_flash_fault_get, > +}; > + > +static int lm3601x_register_leds(struct lm3601x_led *led) > +{ > + struct led_classdev *led_cdev; > + struct led_flash_setting *setting; > + > + led->fled_cdev.ops = &flash_ops; > + > + setting = &led->fled_cdev.timeout; > + setting->min = LM3601X_MIN_TIMEOUT_US; > + setting->max = led->max_flash_timeout; > + setting->step = LM3601X_LOWER_STEP_US; > + setting->val = led->max_flash_timeout; > + > + setting = &led->fled_cdev.brightness; > + setting->min = LM3601X_MIN_STROBE_I_UA; > + setting->max = led->flash_current_max; > + setting->step = LM3601X_TORCH_REG_DIV; > + setting->val = led->flash_current_max; > + > + led_cdev = &led->fled_cdev.led_cdev; > + led_cdev->name = led->led_name; > + led_cdev->brightness_set_blocking = lm3601x_brightness_set; > + led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max, > + LM3601X_TORCH_REG_DIV); > + led_cdev->flags |= LED_DEV_CAP_FLASH; > + > + return led_classdev_flash_register(&led->client->dev, &led->fled_cdev); > +} > + > +static int lm3601x_parse_node(struct lm3601x_led *led) > +{ > + struct fwnode_handle *child = NULL; > + int ret = -ENODEV; > + const char *name; > + > + child = device_get_next_child_node(&led->client->dev, child); > + if (!child) { > + dev_err(&led->client->dev, "No LED Child node\n"); > + return ret; > + } > + > + ret = fwnode_property_read_u32(child, "reg", &led->led_mode); > + if (ret) { > + dev_err(&led->client->dev, "reg DT property missing\n"); > + goto out_err; > + } > + > + if (led->led_mode > LM3601X_LED_TORCH || > + led->led_mode < LM3601X_LED_IR) { > + dev_warn(&led->client->dev, "Invalid led mode requested\n"); > + ret = -EINVAL; > + goto out_err; > + } > + > + ret = fwnode_property_read_string(child, "label", &name); > + if (ret) { > + if (led->led_mode == LM3601X_LED_TORCH) > + name = "torch"; > + else > + name = "infrared"; > + } > + > + snprintf(led->led_name, sizeof(led->led_name), > + "%s:%s", led->client->name, name); > + > + ret = fwnode_property_read_u32(child, "led-max-microamp", > + &led->torch_current_max); > + if (ret) { > + dev_warn(&led->client->dev, > + "led-max-microamp DT property missing\n"); > + goto out_err; > + } > + > + ret = fwnode_property_read_u32(child, "flash-max-microamp", > + &led->flash_current_max); > + if (ret) { > + dev_warn(&led->client->dev, > + "flash-max-microamp DT property missing\n"); > + goto out_err; > + } > + > + ret = fwnode_property_read_u32(child, "flash-max-timeout-us", > + &led->max_flash_timeout); > + if (ret) { > + dev_warn(&led->client->dev, > + "flash-max-timeout-us DT property missing\n"); > + goto out_err; > + } > + > +out_err: > + fwnode_handle_put(child); > + return ret; > +} > + > +static int lm3601x_probe(struct i2c_client *client) > +{ > + struct lm3601x_led *led; > + int ret; > + > + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); > + if (!led) > + return -ENOMEM; > + > + led->client = client; > + i2c_set_clientdata(client, led); > + > + ret = lm3601x_parse_node(led); > + if (ret) > + return -ENODEV; > + > + led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap); > + if (IS_ERR(led->regmap)) { > + ret = PTR_ERR(led->regmap); > + dev_err(&client->dev, > + "Failed to allocate register map: %d\n", ret); > + return ret; > + } > + > + mutex_init(&led->lock); > + > + return lm3601x_register_leds(led); > +} > + > +static int lm3601x_remove(struct i2c_client *client) > +{ > + struct lm3601x_led *led = i2c_get_clientdata(client); > + > + led_classdev_flash_unregister(&led->fled_cdev); > + mutex_destroy(&led->lock); > + > + return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_ENABLE_MASK, > + LM3601X_MODE_STANDBY); > +} > + > +static const struct i2c_device_id lm3601x_id[] = { > + { "LM36010", CHIP_LM36010 }, > + { "LM36011", CHIP_LM36011 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, lm3601x_id); > + > +static const struct of_device_id of_lm3601x_leds_match[] = { > + { .compatible = "ti,lm36010", }, > + { .compatible = "ti,lm36011", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match); > + > +static struct i2c_driver lm3601x_i2c_driver = { > + .driver = { > + .name = "lm3601x", > + .of_match_table = of_lm3601x_leds_match, > + }, > + .probe_new = lm3601x_probe, > + .remove = lm3601x_remove, > + .id_table = lm3601x_id, > +}; > +module_i2c_driver(lm3601x_i2c_driver); > + > +MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X"); > +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); > +MODULE_LICENSE("GPL v2"); > Patch set applied to the for-next branch of linux-leds.git. -- Best regards, Jacek Anaszewski
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 2c896c0e69e1..d95d436e6089 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -145,6 +145,15 @@ config LEDS_LM3692X This option enables support for the TI LM3692x family of white LED string drivers used for backlighting. +config LEDS_LM3601X + tristate "LED support for LM3601x Chips" + depends on LEDS_CLASS && I2C + depends on LEDS_CLASS_FLASH + select REGMAP_I2C + help + This option enables support for the TI LM3601x family + of flash, torch and indicator classes. + config LEDS_LOCOMO tristate "LED Support for Locomo device" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 91eca81cae82..b79807fe1b67 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o +obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-lm3601x.c b/drivers/leds/leds-lm3601x.c new file mode 100644 index 000000000000..081aa71e43a3 --- /dev/null +++ b/drivers/leds/leds-lm3601x.c @@ -0,0 +1,487 @@ +// SPDX-License-Identifier: GPL-2.0 +// Flash and torch driver for Texas Instruments LM3601X LED +// Flash driver chip family +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/leds.h> +#include <linux/led-class-flash.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <uapi/linux/uleds.h> + +#define LM3601X_LED_IR 0x0 +#define LM3601X_LED_TORCH 0x1 + +/* Registers */ +#define LM3601X_ENABLE_REG 0x01 +#define LM3601X_CFG_REG 0x02 +#define LM3601X_LED_FLASH_REG 0x03 +#define LM3601X_LED_TORCH_REG 0x04 +#define LM3601X_FLAGS_REG 0x05 +#define LM3601X_DEV_ID_REG 0x06 + +#define LM3601X_SW_RESET BIT(7) + +/* Enable Mode bits */ +#define LM3601X_MODE_STANDBY 0x00 +#define LM3601X_MODE_IR_DRV BIT(0) +#define LM3601X_MODE_TORCH BIT(1) +#define LM3601X_MODE_STROBE (BIT(0) | BIT(1)) +#define LM3601X_STRB_EN BIT(2) +#define LM3601X_STRB_EDGE_TRIG BIT(3) +#define LM3601X_IVFM_EN BIT(4) + +#define LM36010_BOOST_LIMIT_28 BIT(5) +#define LM36010_BOOST_FREQ_4MHZ BIT(6) +#define LM36010_BOOST_MODE_PASS BIT(7) + +/* Flag Mask */ +#define LM3601X_FLASH_TIME_OUT BIT(0) +#define LM3601X_UVLO_FAULT BIT(1) +#define LM3601X_THERM_SHUTDOWN BIT(2) +#define LM3601X_THERM_CURR BIT(3) +#define LM36010_CURR_LIMIT BIT(4) +#define LM3601X_SHORT_FAULT BIT(5) +#define LM3601X_IVFM_TRIP BIT(6) +#define LM36010_OVP_FAULT BIT(7) + +#define LM3601X_MAX_TORCH_I_UA 376000 +#define LM3601X_MIN_TORCH_I_UA 2400 +#define LM3601X_TORCH_REG_DIV 2965 + +#define LM3601X_MAX_STROBE_I_UA 1500000 +#define LM3601X_MIN_STROBE_I_UA 11000 +#define LM3601X_STROBE_REG_DIV 11800 + +#define LM3601X_TIMEOUT_MASK 0x1e +#define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH) + +#define LM3601X_LOWER_STEP_US 40000 +#define LM3601X_UPPER_STEP_US 200000 +#define LM3601X_MIN_TIMEOUT_US 40000 +#define LM3601X_MAX_TIMEOUT_US 1600000 +#define LM3601X_TIMEOUT_XOVER_US 400000 + +enum lm3601x_type { + CHIP_LM36010 = 0, + CHIP_LM36011, +}; + +/** + * struct lm3601x_led - + * @fled_cdev: flash LED class device pointer + * @client: Pointer to the I2C client + * @regmap: Devices register map + * @lock: Lock for reading/writing the device + * @led_name: LED label for the Torch or IR LED + * @flash_timeout: the timeout for the flash + * @last_flag: last known flags register value + * @torch_current_max: maximum current for the torch + * @flash_current_max: maximum current for the flash + * @max_flash_timeout: maximum timeout for the flash + * @led_mode: The mode to enable either IR or Torch + */ +struct lm3601x_led { + struct led_classdev_flash fled_cdev; + struct i2c_client *client; + struct regmap *regmap; + struct mutex lock; + + char led_name[LED_MAX_NAME_SIZE]; + + unsigned int flash_timeout; + unsigned int last_flag; + + u32 torch_current_max; + u32 flash_current_max; + u32 max_flash_timeout; + + u32 led_mode; +}; + +static const struct reg_default lm3601x_regmap_defs[] = { + { LM3601X_ENABLE_REG, 0x20 }, + { LM3601X_CFG_REG, 0x15 }, + { LM3601X_LED_FLASH_REG, 0x00 }, + { LM3601X_LED_TORCH_REG, 0x00 }, +}; + +static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case LM3601X_FLAGS_REG: + return true; + default: + return false; + } +} + +static const struct regmap_config lm3601x_regmap = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = LM3601X_DEV_ID_REG, + .reg_defaults = lm3601x_regmap_defs, + .num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs), + .cache_type = REGCACHE_RBTREE, + .volatile_reg = lm3601x_volatile_reg, +}; + +static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev) +{ + return container_of(fled_cdev, struct lm3601x_led, fled_cdev); +} + +static int lm3601x_read_faults(struct lm3601x_led *led) +{ + int flags_val; + int ret; + + ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val); + if (ret < 0) + return -EIO; + + led->last_flag = 0; + + if (flags_val & LM36010_OVP_FAULT) + led->last_flag |= LED_FAULT_OVER_VOLTAGE; + + if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR)) + led->last_flag |= LED_FAULT_OVER_TEMPERATURE; + + if (flags_val & LM3601X_SHORT_FAULT) + led->last_flag |= LED_FAULT_SHORT_CIRCUIT; + + if (flags_val & LM36010_CURR_LIMIT) + led->last_flag |= LED_FAULT_OVER_CURRENT; + + if (flags_val & LM3601X_UVLO_FAULT) + led->last_flag |= LED_FAULT_UNDER_VOLTAGE; + + if (flags_val & LM3601X_IVFM_TRIP) + led->last_flag |= LED_FAULT_INPUT_VOLTAGE; + + if (flags_val & LM3601X_THERM_SHUTDOWN) + led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE; + + return led->last_flag; +} + +static int lm3601x_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev); + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + int ret, led_mode_val; + + mutex_lock(&led->lock); + + ret = lm3601x_read_faults(led); + if (ret < 0) + goto out; + + if (led->led_mode == LM3601X_LED_TORCH) + led_mode_val = LM3601X_MODE_TORCH; + else + led_mode_val = LM3601X_MODE_IR_DRV; + + if (brightness == LED_OFF) { + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + led_mode_val, LED_OFF); + goto out; + } + + ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness); + if (ret < 0) + goto out; + + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, + led_mode_val); +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev, + bool state) +{ + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + int timeout_reg_val; + int current_timeout; + int ret; + + mutex_lock(&led->lock); + + ret = regmap_read(led->regmap, LM3601X_CFG_REG, ¤t_timeout); + if (ret < 0) + goto out; + + if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US) + timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07; + else + timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01; + + if (led->flash_timeout != current_timeout) + ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG, + LM3601X_TIMEOUT_MASK, timeout_reg_val); + + if (state) + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, + LM3601X_MODE_STROBE); + else + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + LM3601X_MODE_STROBE, LED_OFF); + + ret = lm3601x_read_faults(led); +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev, + u32 brightness) +{ + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + u8 brightness_val; + int ret; + + mutex_lock(&led->lock); + ret = lm3601x_read_faults(led); + if (ret < 0) + goto out; + + if (brightness == LED_OFF) { + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + LM3601X_MODE_STROBE, LED_OFF); + goto out; + } + + brightness_val = brightness / LM3601X_STROBE_REG_DIV; + + ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val); +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev, + u32 timeout) +{ + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + + mutex_lock(&led->lock); + + led->flash_timeout = timeout; + + mutex_unlock(&led->lock); + + return 0; +} + +static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) +{ + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + int strobe_state; + int ret; + + mutex_lock(&led->lock); + + ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state); + if (ret < 0) + goto out; + + *state = strobe_state & LM3601X_MODE_STROBE; + +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev, + u32 *fault) +{ + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); + + lm3601x_read_faults(led); + + *fault = led->last_flag; + + return 0; +} + +static const struct led_flash_ops flash_ops = { + .flash_brightness_set = lm3601x_flash_brightness_set, + .strobe_set = lm3601x_strobe_set, + .strobe_get = lm3601x_strobe_get, + .timeout_set = lm3601x_flash_timeout_set, + .fault_get = lm3601x_flash_fault_get, +}; + +static int lm3601x_register_leds(struct lm3601x_led *led) +{ + struct led_classdev *led_cdev; + struct led_flash_setting *setting; + + led->fled_cdev.ops = &flash_ops; + + setting = &led->fled_cdev.timeout; + setting->min = LM3601X_MIN_TIMEOUT_US; + setting->max = led->max_flash_timeout; + setting->step = LM3601X_LOWER_STEP_US; + setting->val = led->max_flash_timeout; + + setting = &led->fled_cdev.brightness; + setting->min = LM3601X_MIN_STROBE_I_UA; + setting->max = led->flash_current_max; + setting->step = LM3601X_TORCH_REG_DIV; + setting->val = led->flash_current_max; + + led_cdev = &led->fled_cdev.led_cdev; + led_cdev->name = led->led_name; + led_cdev->brightness_set_blocking = lm3601x_brightness_set; + led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max, + LM3601X_TORCH_REG_DIV); + led_cdev->flags |= LED_DEV_CAP_FLASH; + + return led_classdev_flash_register(&led->client->dev, &led->fled_cdev); +} + +static int lm3601x_parse_node(struct lm3601x_led *led) +{ + struct fwnode_handle *child = NULL; + int ret = -ENODEV; + const char *name; + + child = device_get_next_child_node(&led->client->dev, child); + if (!child) { + dev_err(&led->client->dev, "No LED Child node\n"); + return ret; + } + + ret = fwnode_property_read_u32(child, "reg", &led->led_mode); + if (ret) { + dev_err(&led->client->dev, "reg DT property missing\n"); + goto out_err; + } + + if (led->led_mode > LM3601X_LED_TORCH || + led->led_mode < LM3601X_LED_IR) { + dev_warn(&led->client->dev, "Invalid led mode requested\n"); + ret = -EINVAL; + goto out_err; + } + + ret = fwnode_property_read_string(child, "label", &name); + if (ret) { + if (led->led_mode == LM3601X_LED_TORCH) + name = "torch"; + else + name = "infrared"; + } + + snprintf(led->led_name, sizeof(led->led_name), + "%s:%s", led->client->name, name); + + ret = fwnode_property_read_u32(child, "led-max-microamp", + &led->torch_current_max); + if (ret) { + dev_warn(&led->client->dev, + "led-max-microamp DT property missing\n"); + goto out_err; + } + + ret = fwnode_property_read_u32(child, "flash-max-microamp", + &led->flash_current_max); + if (ret) { + dev_warn(&led->client->dev, + "flash-max-microamp DT property missing\n"); + goto out_err; + } + + ret = fwnode_property_read_u32(child, "flash-max-timeout-us", + &led->max_flash_timeout); + if (ret) { + dev_warn(&led->client->dev, + "flash-max-timeout-us DT property missing\n"); + goto out_err; + } + +out_err: + fwnode_handle_put(child); + return ret; +} + +static int lm3601x_probe(struct i2c_client *client) +{ + struct lm3601x_led *led; + int ret; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->client = client; + i2c_set_clientdata(client, led); + + ret = lm3601x_parse_node(led); + if (ret) + return -ENODEV; + + led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap); + if (IS_ERR(led->regmap)) { + ret = PTR_ERR(led->regmap); + dev_err(&client->dev, + "Failed to allocate register map: %d\n", ret); + return ret; + } + + mutex_init(&led->lock); + + return lm3601x_register_leds(led); +} + +static int lm3601x_remove(struct i2c_client *client) +{ + struct lm3601x_led *led = i2c_get_clientdata(client); + + led_classdev_flash_unregister(&led->fled_cdev); + mutex_destroy(&led->lock); + + return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, + LM3601X_ENABLE_MASK, + LM3601X_MODE_STANDBY); +} + +static const struct i2c_device_id lm3601x_id[] = { + { "LM36010", CHIP_LM36010 }, + { "LM36011", CHIP_LM36011 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm3601x_id); + +static const struct of_device_id of_lm3601x_leds_match[] = { + { .compatible = "ti,lm36010", }, + { .compatible = "ti,lm36011", }, + { } +}; +MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match); + +static struct i2c_driver lm3601x_i2c_driver = { + .driver = { + .name = "lm3601x", + .of_match_table = of_lm3601x_leds_match, + }, + .probe_new = lm3601x_probe, + .remove = lm3601x_remove, + .id_table = lm3601x_id, +}; +module_i2c_driver(lm3601x_i2c_driver); + +MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X"); +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); +MODULE_LICENSE("GPL v2");