Re: [PATCH 12/13] staging: iio: tsl2x7x: various comment cleanups

[Jonathan Cameron]

On Fri, 20 Apr 2018 20:41:52 -0400
Brian Masney <masneyb@xxxxxxxxxxxxx> wrote:

> This patch removes several unnecessary comments, changes some comments
> so that the use as much of the allowable 80 characters as possible, adds
> the proper whitespace, removes some structure members from the kernel
> docs that are no longer present, and improves the existing kernel doc
> information for some existing structure members.
> 
> Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
Looks sensible

Applied,

Thanks,

Jonathan

> ---
>  drivers/staging/iio/light/tsl2x7x.c | 59 +++++++++++++++++--------------------
>  drivers/staging/iio/light/tsl2x7x.h | 48 +++++++++++++++---------------
>  2 files changed, 51 insertions(+), 56 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 293810ff11b9..05c0f3d5fac0 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -1,6 +1,6 @@
>  /*
> - * Device driver for monitoring ambient light intensity in (lux)
> - * and proximity detection (prox) within the TAOS TSL2X7X family of devices.
> + * Device driver for monitoring ambient light intensity in (lux) and proximity
> + * detection (prox) within the TAOS TSL2X7X family of devices.
>   *
>   * Copyright (c) 2012, TAOS Corporation.
>   * Copyright (c) 2017-2018 Brian Masney <masneyb@xxxxxxxxxxxxx>
> @@ -21,7 +21,7 @@
>  #include <linux/iio/sysfs.h>
>  #include "tsl2x7x.h"
>  
> -/* Cal defs*/
> +/* Cal defs */
>  #define PROX_STAT_CAL			0
>  #define PROX_STAT_SAMP			1
>  #define MAX_SAMPLES_CAL			200
> @@ -34,10 +34,11 @@
>  /* Lux calculation constants */
>  #define TSL2X7X_LUX_CALC_OVER_FLOW	65535
>  
> -/* TAOS Register definitions - note:
> - * depending on device, some of these register are not used and the
> - * register address is benign.
> +/*
> + * TAOS Register definitions - Note: depending on device, some of these register
> + * are not used and the register address is benign.
>   */
> +
>  /* 2X7X register offsets */
>  #define TSL2X7X_MAX_CONFIG_REG		16
>  
> @@ -342,15 +343,14 @@ static int tsl2x7x_read_autoinc_regs(struct tsl2X7X_chip *chip, int lower_reg,
>   * @indio_dev:	pointer to IIO device
>   *
>   * The raw ch0 and ch1 values of the ambient light sensed in the last
> - * integration cycle are read from the device.
> - * Time scale factor array values are adjusted based on the integration time.
> - * The raw values are multiplied by a scale factor, and device gain is obtained
> - * using gain index. Limit checks are done next, then the ratio of a multiple
> - * of ch1 value, to the ch0 value, is calculated. Array tsl2x7x_device_lux[]
> - * is then scanned to find the first ratio value that is just above the ratio
> - * we just calculated. The ch0 and ch1 multiplier constants in the array are
> - * then used along with the time scale factor array values, to calculate the
> - * lux.
> + * integration cycle are read from the device. Time scale factor array values
> + * are adjusted based on the integration time. The raw values are multiplied
> + * by a scale factor, and device gain is obtained using gain index. Limit
> + * checks are done next, then the ratio of a multiple of ch1 value, to the
> + * ch0 value, is calculated. Array tsl2x7x_device_lux[] is then scanned to
> + * find the first ratio value that is just above the ratio we just calculated.
> + * The ch0 and ch1 multiplier constants in the array are then used along with
> + * the time scale factor array values, to calculate the lux.
>   */
>  static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>  {
> @@ -363,7 +363,6 @@ static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>  	mutex_lock(&chip->als_mutex);
>  
>  	if (chip->tsl2x7x_chip_status != TSL2X7X_CHIP_WORKING) {
> -		/* device is not enabled */
>  		dev_err(&chip->client->dev, "%s: device is not enabled\n",
>  			__func__);
>  		ret = -EBUSY;
> @@ -374,7 +373,6 @@ static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>  	if (ret < 0)
>  		goto out_unlock;
>  
> -	/* is data new & valid */
>  	if (!(ret & TSL2X7X_STA_ADC_VALID)) {
>  		dev_err(&chip->client->dev,
>  			"%s: data not valid yet\n", __func__);
> @@ -430,12 +428,12 @@ static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>  		lux = (lux + (chip->als_time_scale >> 1)) /
>  			chip->als_time_scale;
>  
> -	/* adjust for active gain scale
> -	 * The tsl2x7x_device_lux tables have a factor of 256 built-in.
> -	 * User-specified gain provides a multiplier.
> +	/*
> +	 * adjust for active gain scale. The tsl2x7x_device_lux tables have a
> +	 * factor of 256 built-in. User-specified gain provides a multiplier.
>  	 * Apply user-specified gain before shifting right to retain precision.
> -	 * Use 64 bits to avoid overflow on multiplication.
> -	 * Then go back to 32 bits before division to avoid using div_u64().
> +	 * Use 64 bits to avoid overflow on multiplication. Then go back to
> +	 * 32 bits before division to avoid using div_u64().
>  	 */
>  
>  	lux64 = lux;
> @@ -713,14 +711,13 @@ static int tsl2x7x_chip_off(struct iio_dev *indio_dev)
>  }
>  
>  /**
> - * tsl2x7x_invoke_change
> + * tsl2x7x_invoke_change - power cycle the device to implement the user
> + *                         parameters
>   * @indio_dev:	pointer to IIO device
>   *
> - * Obtain and lock both ALS and PROX resources,
> - * determine and save device state (On/Off),
> - * cycle device to implement updated parameter,
> - * put device back into proper state, and unlock
> - * resource.
> + * Obtain and lock both ALS and PROX resources, determine and save device state
> + * (On/Off), cycle device to implement updated parameter, put device back into
> + * proper state, and unlock resource.
>   */
>  static int tsl2x7x_invoke_change(struct iio_dev *indio_dev)
>  {
> @@ -895,7 +892,8 @@ static ssize_t in_illuminance0_lux_table_store(struct device *dev,
>  
>  	get_options(buf, ARRAY_SIZE(value), value);
>  
> -	/* We now have an array of ints starting at value[1], and
> +	/*
> +	 * We now have an array of ints starting at value[1], and
>  	 * enumerated by value[0].
>  	 * We expect each group of three ints is one table entry,
>  	 * and the last table entry is all 0.
> @@ -1643,9 +1641,7 @@ static int tsl2x7x_probe(struct i2c_client *clientp,
>  		}
>  	}
>  
> -	/* Load up the defaults */
>  	tsl2x7x_defaults(chip);
> -	/* Make sure the chip is on */
>  	tsl2x7x_chip_on(indio_dev);
>  
>  	ret = iio_device_register(indio_dev);
> @@ -1719,7 +1715,6 @@ static const struct dev_pm_ops tsl2x7x_pm_ops = {
>  	.resume  = tsl2x7x_resume,
>  };
>  
> -/* Driver definition */
>  static struct i2c_driver tsl2x7x_driver = {
>  	.driver = {
>  		.name = "tsl2x7x",
> diff --git a/drivers/staging/iio/light/tsl2x7x.h b/drivers/staging/iio/light/tsl2x7x.h
> index 408e5a89edb1..85d8fe7a94c8 100644
> --- a/drivers/staging/iio/light/tsl2x7x.h
> +++ b/drivers/staging/iio/light/tsl2x7x.h
> @@ -36,32 +36,35 @@ struct tsl2x7x_lux {
>  #define TSL2X7X_MAX_TIMER_CNT           0xFF
>  
>  /**
> - * struct tsl2x7x_default_settings - power on defaults unless
> - *                                   overridden by platform data.
> - *  @als_time:              ALS Integration time - multiple of 50mS
> - *  @als_gain:              Index into the ALS gain table.
> - *  @als_gain_trim:         default gain trim to account for
> - *                          aperture effects.
> - *  @wait_time:             Time between PRX and ALS cycles
> - *                          in 2.7 periods
> - *  @prox_time:             5.2ms prox integration time -
> - *                          decrease in 2.7ms periods
> - *  @prox_gain:             Proximity gain index
> + * struct tsl2x7x_settings - Settings for the tsl2x7x driver
> + *  @als_time:              Integration time of the ALS channel ADCs in 2.73 ms
> + *                          increments. Total integration time is
> + *                          (256 - als_time) * 2.73.
> + *  @als_gain:              Index into the tsl2x7x_als_gain array.
> + *  @als_gain_trim:         Default gain trim to account for aperture effects.
> + *  @wait_time:             Time between proximity and ALS cycles in 2.73
> + *                          periods.
> + *  @prox_time:             Integration time of the proximity ADC in 2.73 ms
> + *                          increments. Total integration time is
> + *                          (256 - prx_time) * 2.73.
> + *  @prox_gain:             Index into the tsl2x7x_prx_gain array.
>   *  @prox_config:           Prox configuration filters.
> - *  @als_cal_target:        Known external ALS reading for
> - *                          calibration.
> - *  @als_persistence:       H/W Filters, Number of 'out of limits'
> - *                          ALS readings.
> + *  @als_cal_target:        Known external ALS reading for calibration.
> + *  @als_persistence:       H/W Filters, Number of 'out of limits' ALS readings.
>   *  @als_interrupt_en:      Enable/Disable ALS interrupts
>   *  @als_thresh_low:        CH0 'low' count to trigger interrupt.
>   *  @als_thresh_high:       CH0 'high' count to trigger interrupt.
> - *  @prox_persistence:      H/W Filters, Number of 'out of limits'
> - *                          proximity readings.
> - *  @prox_interrupt_en:     Enable/Disable proximity interrupts
> + *  @prox_persistence:      H/W Filters, Number of 'out of limits' proximity
> + *                          readings.
> + *  @prox_interrupt_en:     Enable/Disable proximity interrupts.
>   *  @prox_thres_low:        Low threshold proximity detection.
> - *  @prox_thres_high:       High threshold proximity detection
> - *  @prox_pulse_count:      Number if proximity emitter pulses
> - *  @prox_max_samples_cal:  Used for prox cal.
> + *  @prox_thres_high:       High threshold proximity detection.
> + *  @prox_pulse_count:      Number if proximity emitter pulses.
> + *  @prox_max_samples_cal:  The number of samples that are taken when performing
> + *                          a proximity calibration.
> + *  @prox_diode             Which diode(s) to use for driving the external
> + *                          LED(s) for proximity sensing.
> + *  @prox_power             The amount of power to use for the external LED(s).
>   */
>  struct tsl2x7x_settings {
>  	int als_time;
> @@ -88,9 +91,6 @@ struct tsl2x7x_settings {
>  
>  /**
>   * struct tsl2X7X_platform_data - Platform callback, glass and defaults
> - * @platform_power:            Suspend/resume platform callback
> - * @power_on:                  Power on callback
> - * @power_off:                 Power off callback
>   * @platform_lux_table:        Device specific glass coefficents
>   * @platform_default_settings: Device specific power on defaults
>   *