| Message ID | 20241015-ad7606_add_iio_backend_support-v5-7-654faf1ae08c@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add iio backend compatibility for ad7606 | expand |
On 10/15/24 15:56, Guillaume Stols wrote: > - Basic support for iio backend. > - Supports IIO_CHAN_INFO_SAMP_FREQ R/W. > - Only hardware mode is available, and that IIO_CHAN_INFO_RAW is not > supported if iio-backend mode is selected. > > Signed-off-by: Guillaume Stols <gstols@baylibre.com> > --- > drivers/iio/adc/Kconfig | 2 + > drivers/iio/adc/ad7606.c | 154 ++++++++++++++++++++++++++++++++++--------- > drivers/iio/adc/ad7606.h | 15 +++++ > drivers/iio/adc/ad7606_par.c | 92 +++++++++++++++++++++++++- > 4 files changed, 231 insertions(+), 32 deletions(-) > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index 91873f60322d..a57b5f0bc070 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -224,9 +224,11 @@ config AD7606_IFACE_PARALLEL > tristate "Analog Devices AD7606 ADC driver with parallel interface support" > depends on HAS_IOPORT > select AD7606 > + select IIO_BACKEND > help > Say yes here to build parallel interface support for Analog Devices: > ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC). > + It also support iio_backended devices for AD7606B. > > To compile this driver as a module, choose M here: the > module will be called ad7606_par. > diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c > index 34d377e9ac79..7871552ce5ac 100644 > --- a/drivers/iio/adc/ad7606.c > +++ b/drivers/iio/adc/ad7606.c > @@ -21,6 +21,7 @@ > #include <linux/units.h> > #include <linux/util_macros.h> > > +#include <linux/iio/backend.h> > #include <linux/iio/buffer.h> > #include <linux/iio/iio.h> > #include <linux/iio/sysfs.h> > @@ -191,6 +192,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606_4_info, IIO_AD7606); > > const struct ad7606_chip_info ad7606b_info = { > .channels = ad7606_channels_16bit, > + .max_samplerate = 800 * KILO, > .name = "ad7606b", > .num_adc_channels = 8, > .num_channels = 9, > @@ -490,6 +492,17 @@ static int ad7606_pwm_set_low(struct ad7606_state *st) > return ret; > } > > +static int ad7606_pwm_set_swing(struct ad7606_state *st) > +{ > + struct pwm_state cnvst_pwm_state; > + > + pwm_get_state(st->cnvst_pwm, &cnvst_pwm_state); > + cnvst_pwm_state.enabled = true; > + cnvst_pwm_state.duty_cycle = cnvst_pwm_state.period / 2; > + > + return pwm_apply_might_sleep(st->cnvst_pwm, &cnvst_pwm_state); > +} > + > static bool ad7606_pwm_is_swinging(struct ad7606_state *st) > { > struct pwm_state cnvst_pwm_state; > @@ -576,11 +589,22 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch, > if (ret < 0) > return ret; > } > - ret = wait_for_completion_timeout(&st->completion, > - msecs_to_jiffies(1000)); > - if (!ret) { > - ret = -ETIMEDOUT; > - goto error_ret; > + > + /* > + * If no backend, wait for the interruption on busy pin, otherwise just add > + * a delay to leave time for the data to be available. For now, the latter > + * will not happen because IIO_CHAN_INFO_RAW is not supported for the backend. > + * TODO: Add support for reading a single value when the backend is used. > + */ > + if (!st->back) { > + ret = wait_for_completion_timeout(&st->completion, > + msecs_to_jiffies(1000)); > + if (!ret) { > + ret = -ETIMEDOUT; > + goto error_ret; > + } > + } else { > + fsleep(1); > } > > ret = ad7606_read_samples(st); > @@ -620,6 +644,7 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, > int ret, ch = 0; > struct ad7606_state *st = iio_priv(indio_dev); > struct ad7606_chan_scale *cs; > + struct pwm_state cnvst_pwm_state; > > switch (m) { > case IIO_CHAN_INFO_RAW: > @@ -640,6 +665,14 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, > case IIO_CHAN_INFO_OVERSAMPLING_RATIO: > *val = st->oversampling; > return IIO_VAL_INT; > + case IIO_CHAN_INFO_SAMP_FREQ: > + /* > + * TODO: return the real frequency intead of the requested one once > + * pwm_get_state_hw comes upstream. > + */ > + pwm_get_state(st->cnvst_pwm, &cnvst_pwm_state); > + *val = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC, cnvst_pwm_state.period); > + return IIO_VAL_INT; > } > return -EINVAL; > } > @@ -732,6 +765,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, > return ret; > > return 0; > + case IIO_CHAN_INFO_SAMP_FREQ: > + if (val < 0 && val2 != 0) > + return -EINVAL; > + return ad7606_set_sampling_freq(st, val); > default: > return -EINVAL; > } > @@ -914,14 +951,50 @@ static int ad7606_read_avail(struct iio_dev *indio_dev, > return -EINVAL; > } > > +static int ad7606_backend_buffer_postenable(struct iio_dev *indio_dev) > +{ > + struct ad7606_state *st = iio_priv(indio_dev); > + > + return ad7606_pwm_set_swing(st); > +} > + > +static int ad7606_backend_buffer_predisable(struct iio_dev *indio_dev) > +{ > + struct ad7606_state *st = iio_priv(indio_dev); > + > + return ad7606_pwm_set_low(st); > +} > + > +static int ad7606_update_scan_mode(struct iio_dev *indio_dev, > + const unsigned long *scan_mask) > +{ > + struct ad7606_state *st = iio_priv(indio_dev); > + > + /* > + * The update scan mode is only for iio backend compatible drivers. > + * If the specific update_scan_mode is not defined in the bus ops, > + * just do nothing and return 0. > + */ > + if (!st->bops->update_scan_mode) > + return 0; > + > + return st->bops->update_scan_mode(indio_dev, scan_mask); > +} > + > static const struct iio_buffer_setup_ops ad7606_buffer_ops = { > .postenable = &ad7606_buffer_postenable, > .predisable = &ad7606_buffer_predisable, > }; > > +static const struct iio_buffer_setup_ops ad7606_backend_buffer_ops = { > + .postenable = &ad7606_backend_buffer_postenable, > + .predisable = &ad7606_backend_buffer_predisable, > +}; > + > static const struct iio_info ad7606_info_no_os_or_range = { > .read_raw = &ad7606_read_raw, > .validate_trigger = &ad7606_validate_trigger, > + .update_scan_mode = &ad7606_update_scan_mode, > }; > > static const struct iio_info ad7606_info_os_and_range = { > @@ -929,6 +1002,7 @@ static const struct iio_info ad7606_info_os_and_range = { > .write_raw = &ad7606_write_raw, > .attrs = &ad7606_attribute_group_os_and_range, > .validate_trigger = &ad7606_validate_trigger, > + .update_scan_mode = &ad7606_update_scan_mode, > }; > > static const struct iio_info ad7606_info_sw_mode = { > @@ -937,6 +1011,7 @@ static const struct iio_info ad7606_info_sw_mode = { > .read_avail = &ad7606_read_avail, > .debugfs_reg_access = &ad7606_reg_access, > .validate_trigger = &ad7606_validate_trigger, > + .update_scan_mode = &ad7606_update_scan_mode, > }; > > static const struct iio_info ad7606_info_os = { > @@ -944,6 +1019,7 @@ static const struct iio_info ad7606_info_os = { > .write_raw = &ad7606_write_raw, > .attrs = &ad7606_attribute_group_os, > .validate_trigger = &ad7606_validate_trigger, > + .update_scan_mode = &ad7606_update_scan_mode, > }; > > static const struct iio_info ad7606_info_range = { > @@ -951,6 +1027,7 @@ static const struct iio_info ad7606_info_range = { > .write_raw = &ad7606_write_raw, > .attrs = &ad7606_attribute_group_range, > .validate_trigger = &ad7606_validate_trigger, > + .update_scan_mode = &ad7606_update_scan_mode, > }; > > static const struct iio_trigger_ops ad7606_trigger_ops = { > @@ -1070,8 +1147,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, > indio_dev->channels = st->chip_info->channels; > indio_dev->num_channels = st->chip_info->num_channels; > > - init_completion(&st->completion); > - > ret = ad7606_reset(st); > if (ret) > dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); > @@ -1118,34 +1193,51 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, > if (ret) > return ret; > } > - st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", > - indio_dev->name, > - iio_device_id(indio_dev)); > - if (!st->trig) > - return -ENOMEM; > > - st->trig->ops = &ad7606_trigger_ops; > - iio_trigger_set_drvdata(st->trig, indio_dev); > - ret = devm_iio_trigger_register(dev, st->trig); > - if (ret) > - return ret; > + if (st->bops->iio_backend_config) { > + /* > + * If there is a backend, the PWM should not overpass the maximum sampling > + * frequency the chip supports. > + */ > + ret = ad7606_set_sampling_freq(st, > + chip_info->max_samplerate ? : 2 * KILO); > + if (ret) > + return ret; > + > + ret = st->bops->iio_backend_config(dev, indio_dev); > + if (ret) > + return ret; > > - indio_dev->trig = iio_trigger_get(st->trig); > + indio_dev->setup_ops = &ad7606_backend_buffer_ops; > + } else { > + init_completion(&st->completion); > + st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", > + indio_dev->name, > + iio_device_id(indio_dev)); > + if (!st->trig) > + return -ENOMEM; > + > + st->trig->ops = &ad7606_trigger_ops; > + iio_trigger_set_drvdata(st->trig, indio_dev); > + ret = devm_iio_trigger_register(dev, st->trig); > + if (ret) > + return ret; > > - ret = devm_request_threaded_irq(dev, irq, > - NULL, > - &ad7606_interrupt, > - IRQF_TRIGGER_FALLING | IRQF_ONESHOT, > - chip_info->name, indio_dev); > - if (ret) > - return ret; > + indio_dev->trig = iio_trigger_get(st->trig); > > - ret = devm_iio_triggered_buffer_setup(dev, indio_dev, > - &iio_pollfunc_store_time, > - &ad7606_trigger_handler, > - &ad7606_buffer_ops); > - if (ret) > - return ret; > + ret = devm_request_threaded_irq(dev, irq, NULL, &ad7606_interrupt, > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, > + chip_info->name, indio_dev); > + if (ret) > + return ret; > + > + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, > + &iio_pollfunc_store_time, > + &ad7606_trigger_handler, > + &ad7606_buffer_ops); > + if (ret) > + return ret; > + } > > return devm_iio_device_register(dev, indio_dev); > } > diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h > index b26a11b2eba1..2c629a15cc33 100644 > --- a/drivers/iio/adc/ad7606.h > +++ b/drivers/iio/adc/ad7606.h > @@ -61,6 +61,12 @@ > > #define AD7616_CHANNEL(num) AD7606_SW_CHANNEL(num, 16) > > +#define AD7606_BI_CHANNEL(num) \ > + AD760X_CHANNEL(num, 0, \ > + BIT(IIO_CHAN_INFO_SCALE), \ > + BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ > + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), 16) > + > struct ad7606_state; > > typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, > @@ -69,6 +75,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, > /** > * struct ad7606_chip_info - chip specific information > * @channels: channel specification > + * @max_samplerate: maximum supported samplerate > * @name device name > * @num_channels: number of channels > * @num_adc_channels the number of channels the ADC actually inputs. > @@ -82,6 +89,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, > */ > struct ad7606_chip_info { > const struct iio_chan_spec *channels; > + unsigned int max_samplerate; > const char *name; > unsigned int num_adc_channels; > unsigned int num_channels; > @@ -152,6 +160,7 @@ struct ad7606_state { > bool sw_mode_en; > const unsigned int *oversampling_avail; > unsigned int num_os_ratios; > + struct iio_backend *back; > int (*write_scale)(struct iio_dev *indio_dev, int ch, int val); > int (*write_os)(struct iio_dev *indio_dev, int val); > > @@ -180,16 +189,21 @@ struct ad7606_state { > > /** > * struct ad7606_bus_ops - driver bus operations > + * @iio_backend_config function pointer for configuring the iio_backend for > + * the compatibles that use it > * @read_block function pointer for reading blocks of data > * @sw_mode_config: pointer to a function which configured the device > * for software mode > * @reg_read function pointer for reading spi register > * @reg_write function pointer for writing spi register > * @write_mask function pointer for write spi register with mask > + * @update_scan_mode function pointer for handling the calls to iio_info's update_scan > + * mode when enabling/disabling channels. > * @rd_wr_cmd pointer to the function which calculates the spi address > */ > struct ad7606_bus_ops { > /* more methods added in future? */ > + int (*iio_backend_config)(struct device *dev, struct iio_dev *indio_dev); > int (*read_block)(struct device *dev, int num, void *data); > int (*sw_mode_config)(struct iio_dev *indio_dev); > int (*reg_read)(struct ad7606_state *st, unsigned int addr); > @@ -200,6 +214,7 @@ struct ad7606_bus_ops { > unsigned int addr, > unsigned long mask, > unsigned int val); > + int (*update_scan_mode)(struct iio_dev *indio_dev, const unsigned long *scan_mask); > u16 (*rd_wr_cmd)(int addr, char isWriteOp); > }; > > diff --git a/drivers/iio/adc/ad7606_par.c b/drivers/iio/adc/ad7606_par.c > index b87be2f1ca04..6946ff00e4cb 100644 > --- a/drivers/iio/adc/ad7606_par.c > +++ b/drivers/iio/adc/ad7606_par.c > @@ -2,7 +2,8 @@ > /* > * AD7606 Parallel Interface ADC driver > * > - * Copyright 2011 Analog Devices Inc. > + * Copyright 2011 - 2024 Analog Devices Inc. > + * Copyright 2024 BayLibre SAS. > */ > > #include <linux/err.h> > @@ -14,9 +15,82 @@ > #include <linux/property.h> > #include <linux/types.h> > > +#include <linux/iio/backend.h> > #include <linux/iio/iio.h> > + > #include "ad7606.h" > > +static const struct iio_chan_spec ad7606b_bi_channels[] = { > + AD7606_BI_CHANNEL(0), > + AD7606_BI_CHANNEL(1), > + AD7606_BI_CHANNEL(2), > + AD7606_BI_CHANNEL(3), > + AD7606_BI_CHANNEL(4), > + AD7606_BI_CHANNEL(5), > + AD7606_BI_CHANNEL(6), > + AD7606_BI_CHANNEL(7), > +}; > + > +static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) > +{ > + struct ad7606_state *st = iio_priv(indio_dev); > + unsigned int c, ret; > + > + for (c = 0; c < indio_dev->num_channels; c++) { > + if (test_bit(c, scan_mask)) > + ret = iio_backend_chan_enable(st->back, c); > + else > + ret = iio_backend_chan_disable(st->back, c); > + if (ret) > + return ret; > + } > + > + return 0; > +} > + > +static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio_dev) > +{ > + struct ad7606_state *st = iio_priv(indio_dev); > + unsigned int ret, c; > + struct iio_backend_data_fmt data = { > + .sign_extend = true, > + .enable = true, > + }; > + > + st->back = devm_iio_backend_get(dev, NULL); > + if (IS_ERR(st->back)) > + return PTR_ERR(st->back); > + > + /* If the device is iio_backend powered the PWM is mandatory */ > + if (!st->cnvst_pwm) > + return dev_err_probe(st->dev, -EINVAL, > + "A PWM is mandatory when using backend.\n"); > + > + ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev); > + if (ret) > + return ret; > + > + ret = devm_iio_backend_enable(dev, st->back); > + if (ret) > + return ret; > + > + for (c = 0; c < indio_dev->num_channels; c++) { > + ret = iio_backend_data_format_set(st->back, c, &data); > + if (ret) > + return ret; > + } > + > + indio_dev->channels = ad7606b_bi_channels; > + indio_dev->num_channels = 8; > + > + return 0; > +} > + > +static const struct ad7606_bus_ops ad7606_bi_bops = { > + .iio_backend_config = ad7606_bi_setup_iio_backend, > + .update_scan_mode = ad7606_bi_update_scan_mode, > +}; > + > static int ad7606_par16_read_block(struct device *dev, > int count, void *buf) > { > @@ -96,9 +170,22 @@ static int ad7606_par_probe(struct platform_device *pdev) > void __iomem *addr; > resource_size_t remap_size; > int irq; > + struct iio_backend *back; Just spotted that I forgot to remove the declaration. Shall I send another series with this correction ? > > + /* > + * If a firmware node is available (ACPI or DT), platform_device_id is null > + * and we must use get_match_data. > + */ > if (dev_fwnode(&pdev->dev)) { > chip_info = device_get_match_data(&pdev->dev); > + if (device_property_present(&pdev->dev, "io-backends")) > + /* > + * If a backend is available ,call the core probe with backend > + * bops, otherwise use the former bops. > + */ > + return ad7606_probe(&pdev->dev, 0, NULL, > + chip_info, > + &ad7606_bi_bops); > } else { > id = platform_get_device_id(pdev); > chip_info = (const struct ad7606_chip_info *)id->driver_data; > @@ -124,6 +211,7 @@ static const struct platform_device_id ad7606_driver_ids[] = { > { .name = "ad7606-4", .driver_data = (kernel_ulong_t)&ad7606_4_info, }, > { .name = "ad7606-6", .driver_data = (kernel_ulong_t)&ad7606_6_info, }, > { .name = "ad7606-8", .driver_data = (kernel_ulong_t)&ad7606_8_info, }, > + { .name = "ad7606b", .driver_data = (kernel_ulong_t)&ad7606b_info, }, > { } > }; > MODULE_DEVICE_TABLE(platform, ad7606_driver_ids); > @@ -133,6 +221,7 @@ static const struct of_device_id ad7606_of_match[] = { > { .compatible = "adi,ad7606-4", .data = &ad7606_4_info }, > { .compatible = "adi,ad7606-6", .data = &ad7606_6_info }, > { .compatible = "adi,ad7606-8", .data = &ad7606_8_info }, > + { .compatible = "adi,ad7606b", .data = &ad7606b_info }, > { } > }; > MODULE_DEVICE_TABLE(of, ad7606_of_match); > @@ -152,3 +241,4 @@ MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); > MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); > MODULE_LICENSE("GPL v2"); > MODULE_IMPORT_NS(IIO_AD7606); > +MODULE_IMPORT_NS(IIO_BACKEND); >
Hi Guillaume, kernel test robot noticed the following build warnings: [auto build test WARNING on 465644ac29536d10178b5ca4684d0b84765b9fa4] url: https://github.com/intel-lab-lkp/linux/commits/Guillaume-Stols/dt-bindings-iio-adc-ad7606-Remove-spi-cpha-from-required/20241015-215831 base: 465644ac29536d10178b5ca4684d0b84765b9fa4 patch link: https://lore.kernel.org/r/20241015-ad7606_add_iio_backend_support-v5-7-654faf1ae08c%40baylibre.com patch subject: [PATCH v5 7/8] iio: adc: ad7606: Add iio-backend support config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241019/202410190802.CLaySBOq-lkp@intel.com/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241019/202410190802.CLaySBOq-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202410190802.CLaySBOq-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/iio/adc/ad7606_par.c:173:22: warning: unused variable 'back' [-Wunused-variable] 173 | struct iio_backend *back; | ^~~~ 1 warning generated. vim +/back +173 drivers/iio/adc/ad7606_par.c 164 165 static int ad7606_par_probe(struct platform_device *pdev) 166 { 167 const struct ad7606_chip_info *chip_info; 168 const struct platform_device_id *id; 169 struct resource *res; 170 void __iomem *addr; 171 resource_size_t remap_size; 172 int irq; > 173 struct iio_backend *back; 174 175 /* 176 * If a firmware node is available (ACPI or DT), platform_device_id is null 177 * and we must use get_match_data. 178 */ 179 if (dev_fwnode(&pdev->dev)) { 180 chip_info = device_get_match_data(&pdev->dev); 181 if (device_property_present(&pdev->dev, "io-backends")) 182 /* 183 * If a backend is available ,call the core probe with backend 184 * bops, otherwise use the former bops. 185 */ 186 return ad7606_probe(&pdev->dev, 0, NULL, 187 chip_info, 188 &ad7606_bi_bops); 189 } else { 190 id = platform_get_device_id(pdev); 191 chip_info = (const struct ad7606_chip_info *)id->driver_data; 192 } 193 194 irq = platform_get_irq(pdev, 0); 195 if (irq < 0) 196 return irq; 197 198 addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 199 if (IS_ERR(addr)) 200 return PTR_ERR(addr); 201 202 remap_size = resource_size(res); 203 204 return ad7606_probe(&pdev->dev, irq, addr, chip_info, 205 remap_size > 1 ? &ad7606_par16_bops : 206 &ad7606_par8_bops); 207 } 208
On Tue, Oct 15, 2024 at 01:56:20PM +0000, Guillaume Stols wrote: > @@ -640,6 +665,14 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, > case IIO_CHAN_INFO_OVERSAMPLING_RATIO: > *val = st->oversampling; > return IIO_VAL_INT; > + case IIO_CHAN_INFO_SAMP_FREQ: > + /* > + * TODO: return the real frequency intead of the requested one once > + * pwm_get_state_hw comes upstream. > + */ > + pwm_get_state(st->cnvst_pwm, &cnvst_pwm_state); > + *val = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC, cnvst_pwm_state.period); > + return IIO_VAL_INT; > } > return -EINVAL; > } Being late to the party as the patch is already applied: ad7606_set_sampling_freq() uses DIV_ROUND_UP_ULL to determine the period from freq. So I guess you should a down-rounding div here to calculate freq from period. Having said that, pwm_get_state_hw() is in mainline and will be included in v6.13-rc1. Best regards Uwe
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 91873f60322d..a57b5f0bc070 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -224,9 +224,11 @@ config AD7606_IFACE_PARALLEL tristate "Analog Devices AD7606 ADC driver with parallel interface support" depends on HAS_IOPORT select AD7606 + select IIO_BACKEND help Say yes here to build parallel interface support for Analog Devices: ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC). + It also support iio_backended devices for AD7606B. To compile this driver as a module, choose M here: the module will be called ad7606_par. diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index 34d377e9ac79..7871552ce5ac 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -21,6 +21,7 @@ #include <linux/units.h> #include <linux/util_macros.h> +#include <linux/iio/backend.h> #include <linux/iio/buffer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -191,6 +192,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606_4_info, IIO_AD7606); const struct ad7606_chip_info ad7606b_info = { .channels = ad7606_channels_16bit, + .max_samplerate = 800 * KILO, .name = "ad7606b", .num_adc_channels = 8, .num_channels = 9, @@ -490,6 +492,17 @@ static int ad7606_pwm_set_low(struct ad7606_state *st) return ret; } +static int ad7606_pwm_set_swing(struct ad7606_state *st) +{ + struct pwm_state cnvst_pwm_state; + + pwm_get_state(st->cnvst_pwm, &cnvst_pwm_state); + cnvst_pwm_state.enabled = true; + cnvst_pwm_state.duty_cycle = cnvst_pwm_state.period / 2; + + return pwm_apply_might_sleep(st->cnvst_pwm, &cnvst_pwm_state); +} + static bool ad7606_pwm_is_swinging(struct ad7606_state *st) { struct pwm_state cnvst_pwm_state; @@ -576,11 +589,22 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch, if (ret < 0) return ret; } - ret = wait_for_completion_timeout(&st->completion, - msecs_to_jiffies(1000)); - if (!ret) { - ret = -ETIMEDOUT; - goto error_ret; + + /* + * If no backend, wait for the interruption on busy pin, otherwise just add + * a delay to leave time for the data to be available. For now, the latter + * will not happen because IIO_CHAN_INFO_RAW is not supported for the backend. + * TODO: Add support for reading a single value when the backend is used. + */ + if (!st->back) { + ret = wait_for_completion_timeout(&st->completion, + msecs_to_jiffies(1000)); + if (!ret) { + ret = -ETIMEDOUT; + goto error_ret; + } + } else { + fsleep(1); } ret = ad7606_read_samples(st); @@ -620,6 +644,7 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, int ret, ch = 0; struct ad7606_state *st = iio_priv(indio_dev); struct ad7606_chan_scale *cs; + struct pwm_state cnvst_pwm_state; switch (m) { case IIO_CHAN_INFO_RAW: @@ -640,6 +665,14 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *val = st->oversampling; return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + /* + * TODO: return the real frequency intead of the requested one once + * pwm_get_state_hw comes upstream. + */ + pwm_get_state(st->cnvst_pwm, &cnvst_pwm_state); + *val = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC, cnvst_pwm_state.period); + return IIO_VAL_INT; } return -EINVAL; } @@ -732,6 +765,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, return ret; return 0; + case IIO_CHAN_INFO_SAMP_FREQ: + if (val < 0 && val2 != 0) + return -EINVAL; + return ad7606_set_sampling_freq(st, val); default: return -EINVAL; } @@ -914,14 +951,50 @@ static int ad7606_read_avail(struct iio_dev *indio_dev, return -EINVAL; } +static int ad7606_backend_buffer_postenable(struct iio_dev *indio_dev) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + return ad7606_pwm_set_swing(st); +} + +static int ad7606_backend_buffer_predisable(struct iio_dev *indio_dev) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + return ad7606_pwm_set_low(st); +} + +static int ad7606_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + /* + * The update scan mode is only for iio backend compatible drivers. + * If the specific update_scan_mode is not defined in the bus ops, + * just do nothing and return 0. + */ + if (!st->bops->update_scan_mode) + return 0; + + return st->bops->update_scan_mode(indio_dev, scan_mask); +} + static const struct iio_buffer_setup_ops ad7606_buffer_ops = { .postenable = &ad7606_buffer_postenable, .predisable = &ad7606_buffer_predisable, }; +static const struct iio_buffer_setup_ops ad7606_backend_buffer_ops = { + .postenable = &ad7606_backend_buffer_postenable, + .predisable = &ad7606_backend_buffer_predisable, +}; + static const struct iio_info ad7606_info_no_os_or_range = { .read_raw = &ad7606_read_raw, .validate_trigger = &ad7606_validate_trigger, + .update_scan_mode = &ad7606_update_scan_mode, }; static const struct iio_info ad7606_info_os_and_range = { @@ -929,6 +1002,7 @@ static const struct iio_info ad7606_info_os_and_range = { .write_raw = &ad7606_write_raw, .attrs = &ad7606_attribute_group_os_and_range, .validate_trigger = &ad7606_validate_trigger, + .update_scan_mode = &ad7606_update_scan_mode, }; static const struct iio_info ad7606_info_sw_mode = { @@ -937,6 +1011,7 @@ static const struct iio_info ad7606_info_sw_mode = { .read_avail = &ad7606_read_avail, .debugfs_reg_access = &ad7606_reg_access, .validate_trigger = &ad7606_validate_trigger, + .update_scan_mode = &ad7606_update_scan_mode, }; static const struct iio_info ad7606_info_os = { @@ -944,6 +1019,7 @@ static const struct iio_info ad7606_info_os = { .write_raw = &ad7606_write_raw, .attrs = &ad7606_attribute_group_os, .validate_trigger = &ad7606_validate_trigger, + .update_scan_mode = &ad7606_update_scan_mode, }; static const struct iio_info ad7606_info_range = { @@ -951,6 +1027,7 @@ static const struct iio_info ad7606_info_range = { .write_raw = &ad7606_write_raw, .attrs = &ad7606_attribute_group_range, .validate_trigger = &ad7606_validate_trigger, + .update_scan_mode = &ad7606_update_scan_mode, }; static const struct iio_trigger_ops ad7606_trigger_ops = { @@ -1070,8 +1147,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, indio_dev->channels = st->chip_info->channels; indio_dev->num_channels = st->chip_info->num_channels; - init_completion(&st->completion); - ret = ad7606_reset(st); if (ret) dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); @@ -1118,34 +1193,51 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, if (ret) return ret; } - st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", - indio_dev->name, - iio_device_id(indio_dev)); - if (!st->trig) - return -ENOMEM; - st->trig->ops = &ad7606_trigger_ops; - iio_trigger_set_drvdata(st->trig, indio_dev); - ret = devm_iio_trigger_register(dev, st->trig); - if (ret) - return ret; + if (st->bops->iio_backend_config) { + /* + * If there is a backend, the PWM should not overpass the maximum sampling + * frequency the chip supports. + */ + ret = ad7606_set_sampling_freq(st, + chip_info->max_samplerate ? : 2 * KILO); + if (ret) + return ret; + + ret = st->bops->iio_backend_config(dev, indio_dev); + if (ret) + return ret; - indio_dev->trig = iio_trigger_get(st->trig); + indio_dev->setup_ops = &ad7606_backend_buffer_ops; + } else { + init_completion(&st->completion); + st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", + indio_dev->name, + iio_device_id(indio_dev)); + if (!st->trig) + return -ENOMEM; + + st->trig->ops = &ad7606_trigger_ops; + iio_trigger_set_drvdata(st->trig, indio_dev); + ret = devm_iio_trigger_register(dev, st->trig); + if (ret) + return ret; - ret = devm_request_threaded_irq(dev, irq, - NULL, - &ad7606_interrupt, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT, - chip_info->name, indio_dev); - if (ret) - return ret; + indio_dev->trig = iio_trigger_get(st->trig); - ret = devm_iio_triggered_buffer_setup(dev, indio_dev, - &iio_pollfunc_store_time, - &ad7606_trigger_handler, - &ad7606_buffer_ops); - if (ret) - return ret; + ret = devm_request_threaded_irq(dev, irq, NULL, &ad7606_interrupt, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + chip_info->name, indio_dev); + if (ret) + return ret; + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + &iio_pollfunc_store_time, + &ad7606_trigger_handler, + &ad7606_buffer_ops); + if (ret) + return ret; + } return devm_iio_device_register(dev, indio_dev); } diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h index b26a11b2eba1..2c629a15cc33 100644 --- a/drivers/iio/adc/ad7606.h +++ b/drivers/iio/adc/ad7606.h @@ -61,6 +61,12 @@ #define AD7616_CHANNEL(num) AD7606_SW_CHANNEL(num, 16) +#define AD7606_BI_CHANNEL(num) \ + AD760X_CHANNEL(num, 0, \ + BIT(IIO_CHAN_INFO_SCALE), \ + BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), 16) + struct ad7606_state; typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, @@ -69,6 +75,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, /** * struct ad7606_chip_info - chip specific information * @channels: channel specification + * @max_samplerate: maximum supported samplerate * @name device name * @num_channels: number of channels * @num_adc_channels the number of channels the ADC actually inputs. @@ -82,6 +89,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st, */ struct ad7606_chip_info { const struct iio_chan_spec *channels; + unsigned int max_samplerate; const char *name; unsigned int num_adc_channels; unsigned int num_channels; @@ -152,6 +160,7 @@ struct ad7606_state { bool sw_mode_en; const unsigned int *oversampling_avail; unsigned int num_os_ratios; + struct iio_backend *back; int (*write_scale)(struct iio_dev *indio_dev, int ch, int val); int (*write_os)(struct iio_dev *indio_dev, int val); @@ -180,16 +189,21 @@ struct ad7606_state { /** * struct ad7606_bus_ops - driver bus operations + * @iio_backend_config function pointer for configuring the iio_backend for + * the compatibles that use it * @read_block function pointer for reading blocks of data * @sw_mode_config: pointer to a function which configured the device * for software mode * @reg_read function pointer for reading spi register * @reg_write function pointer for writing spi register * @write_mask function pointer for write spi register with mask + * @update_scan_mode function pointer for handling the calls to iio_info's update_scan + * mode when enabling/disabling channels. * @rd_wr_cmd pointer to the function which calculates the spi address */ struct ad7606_bus_ops { /* more methods added in future? */ + int (*iio_backend_config)(struct device *dev, struct iio_dev *indio_dev); int (*read_block)(struct device *dev, int num, void *data); int (*sw_mode_config)(struct iio_dev *indio_dev); int (*reg_read)(struct ad7606_state *st, unsigned int addr); @@ -200,6 +214,7 @@ struct ad7606_bus_ops { unsigned int addr, unsigned long mask, unsigned int val); + int (*update_scan_mode)(struct iio_dev *indio_dev, const unsigned long *scan_mask); u16 (*rd_wr_cmd)(int addr, char isWriteOp); }; diff --git a/drivers/iio/adc/ad7606_par.c b/drivers/iio/adc/ad7606_par.c index b87be2f1ca04..6946ff00e4cb 100644 --- a/drivers/iio/adc/ad7606_par.c +++ b/drivers/iio/adc/ad7606_par.c @@ -2,7 +2,8 @@ /* * AD7606 Parallel Interface ADC driver * - * Copyright 2011 Analog Devices Inc. + * Copyright 2011 - 2024 Analog Devices Inc. + * Copyright 2024 BayLibre SAS. */ #include <linux/err.h> @@ -14,9 +15,82 @@ #include <linux/property.h> #include <linux/types.h> +#include <linux/iio/backend.h> #include <linux/iio/iio.h> + #include "ad7606.h" +static const struct iio_chan_spec ad7606b_bi_channels[] = { + AD7606_BI_CHANNEL(0), + AD7606_BI_CHANNEL(1), + AD7606_BI_CHANNEL(2), + AD7606_BI_CHANNEL(3), + AD7606_BI_CHANNEL(4), + AD7606_BI_CHANNEL(5), + AD7606_BI_CHANNEL(6), + AD7606_BI_CHANNEL(7), +}; + +static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) +{ + struct ad7606_state *st = iio_priv(indio_dev); + unsigned int c, ret; + + for (c = 0; c < indio_dev->num_channels; c++) { + if (test_bit(c, scan_mask)) + ret = iio_backend_chan_enable(st->back, c); + else + ret = iio_backend_chan_disable(st->back, c); + if (ret) + return ret; + } + + return 0; +} + +static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio_dev) +{ + struct ad7606_state *st = iio_priv(indio_dev); + unsigned int ret, c; + struct iio_backend_data_fmt data = { + .sign_extend = true, + .enable = true, + }; + + st->back = devm_iio_backend_get(dev, NULL); + if (IS_ERR(st->back)) + return PTR_ERR(st->back); + + /* If the device is iio_backend powered the PWM is mandatory */ + if (!st->cnvst_pwm) + return dev_err_probe(st->dev, -EINVAL, + "A PWM is mandatory when using backend.\n"); + + ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev); + if (ret) + return ret; + + ret = devm_iio_backend_enable(dev, st->back); + if (ret) + return ret; + + for (c = 0; c < indio_dev->num_channels; c++) { + ret = iio_backend_data_format_set(st->back, c, &data); + if (ret) + return ret; + } + + indio_dev->channels = ad7606b_bi_channels; + indio_dev->num_channels = 8; + + return 0; +} + +static const struct ad7606_bus_ops ad7606_bi_bops = { + .iio_backend_config = ad7606_bi_setup_iio_backend, + .update_scan_mode = ad7606_bi_update_scan_mode, +}; + static int ad7606_par16_read_block(struct device *dev, int count, void *buf) { @@ -96,9 +170,22 @@ static int ad7606_par_probe(struct platform_device *pdev) void __iomem *addr; resource_size_t remap_size; int irq; + struct iio_backend *back; + /* + * If a firmware node is available (ACPI or DT), platform_device_id is null + * and we must use get_match_data. + */ if (dev_fwnode(&pdev->dev)) { chip_info = device_get_match_data(&pdev->dev); + if (device_property_present(&pdev->dev, "io-backends")) + /* + * If a backend is available ,call the core probe with backend + * bops, otherwise use the former bops. + */ + return ad7606_probe(&pdev->dev, 0, NULL, + chip_info, + &ad7606_bi_bops); } else { id = platform_get_device_id(pdev); chip_info = (const struct ad7606_chip_info *)id->driver_data; @@ -124,6 +211,7 @@ static const struct platform_device_id ad7606_driver_ids[] = { { .name = "ad7606-4", .driver_data = (kernel_ulong_t)&ad7606_4_info, }, { .name = "ad7606-6", .driver_data = (kernel_ulong_t)&ad7606_6_info, }, { .name = "ad7606-8", .driver_data = (kernel_ulong_t)&ad7606_8_info, }, + { .name = "ad7606b", .driver_data = (kernel_ulong_t)&ad7606b_info, }, { } }; MODULE_DEVICE_TABLE(platform, ad7606_driver_ids); @@ -133,6 +221,7 @@ static const struct of_device_id ad7606_of_match[] = { { .compatible = "adi,ad7606-4", .data = &ad7606_4_info }, { .compatible = "adi,ad7606-6", .data = &ad7606_6_info }, { .compatible = "adi,ad7606-8", .data = &ad7606_8_info }, + { .compatible = "adi,ad7606b", .data = &ad7606b_info }, { } }; MODULE_DEVICE_TABLE(of, ad7606_of_match); @@ -152,3 +241,4 @@ MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS(IIO_AD7606); +MODULE_IMPORT_NS(IIO_BACKEND);
- Basic support for iio backend. - Supports IIO_CHAN_INFO_SAMP_FREQ R/W. - Only hardware mode is available, and that IIO_CHAN_INFO_RAW is not supported if iio-backend mode is selected. Signed-off-by: Guillaume Stols <gstols@baylibre.com> --- drivers/iio/adc/Kconfig | 2 + drivers/iio/adc/ad7606.c | 154 ++++++++++++++++++++++++++++++++++--------- drivers/iio/adc/ad7606.h | 15 +++++ drivers/iio/adc/ad7606_par.c | 92 +++++++++++++++++++++++++- 4 files changed, 231 insertions(+), 32 deletions(-)