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Date: Sat, 11 Jun 2016 18:17:54 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Crestez Dan Leonard <leonard.crestez@...el.com>,
linux-iio@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Daniel Baluta <daniel.baluta@...el.com>
Subject: Re: [PATCH v2] iio: Add driver for Silabs si1132, si1141/2/3 and
si1145/6/7 ambient light, uv index and proximity sensors
On 30/05/16 20:27, Crestez Dan Leonard wrote:
> From: Peter Meerwald <pmeerw@...erw.net>
>
> The si114x supports x=1,2,3 IR LEDs for proximity sensing together with
> visible and IR ambient light sensing (ALS).
>
> Newer parts (si1132, si1145/6/7) can measure UV light and compute an UV index
>
> Signed-off-by: Peter Meerwald <pmeerw@...erw.net>
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@...el.com>
Various comments inline.
Looking pretty good. Sorry it took me so long to get to it. Been a bit
swamped!
Jonathan
> ---
>
> Changes since Peter's v1:
> * Fix set_chlist returning positive value on success
> * Do not assume channel addresses are in order of scan index
> * Take lock in buffer_preenable
> * Print part/rev/seq id at probe time
> * Cleanup param query/update
> * Poll for response when executing commands
> * Allow writes even when buffer enabled
> * Add interrupt support
> * Rename new to uncompressed_meas_rate for clarity
> * Fix handling IIO_CHAN_INFO_SCALE:
> Make it so that when changing the scale the processed value remains
> identical in identical conditions. The exposed value should be
> proportional to 2 ** -ADC_GAIN.
> * Initialize UCOEF registers to default values from datasheet
> Otherwise by default the coefficients are zero and so are all the
> values read back
> * Fix reading in_uvindex_raw manually (not in buffer mode)
> * Expose in_uvindex_scale=0.01
> * Expose ADC offset, making zero values meaningful
> This is not very well documented, for example the si1145/6/7 datasheet
> lists register 0x1a as 'reserved'. It might make sense to just return a
> constant on these models.
>
> This patch is a result of squashing all my changes. I can post this as a
> large expanded series instead but I'm not sure that helps. Interrupt
> support is technically an additional feature but most of the other
> changes are bugfixes. It doesn't make sense to commit a version exposing
> IIO_CHAN_INFO_SCALE incorrectly.
>
> I tested this on si1143 and si1145
>
> drivers/iio/light/Kconfig | 13 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/si1145.c | 1346 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1360 insertions(+)
> create mode 100644 drivers/iio/light/si1145.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 7c566f5..c362e63 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -266,6 +266,19 @@ config PA12203001
> This driver can also be built as a module. If so, the module
> will be called pa12203001.
>
> +config SI1145
> + tristate "SI1132 and SI1141/2/3/5/6/7 combined ALS, UV index and proximity sensor"
> + depends on I2C
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say Y here if you want to build a driver for the Silicon Labs SI1132 or
> + SI1141/2/3/5/6/7 combined ambient light, UV index and proximity sensor
> + chips.
> +
> + To compile this driver as a module, choose M here: the module will be
> + called si1145.
> +
> config STK3310
> tristate "STK3310 ALS and proximity sensor"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 6f2a3c6..c5768df 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_OPT3001) += opt3001.o
> obj-$(CONFIG_PA12203001) += pa12203001.o
> obj-$(CONFIG_RPR0521) += rpr0521.o
> obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
> +obj-$(CONFIG_SI1145) += si1145.o
> obj-$(CONFIG_STK3310) += stk3310.o
> obj-$(CONFIG_TCS3414) += tcs3414.o
> obj-$(CONFIG_TCS3472) += tcs3472.o
> diff --git a/drivers/iio/light/si1145.c b/drivers/iio/light/si1145.c
> new file mode 100644
> index 0000000..3b25d40
> --- /dev/null
> +++ b/drivers/iio/light/si1145.c
> @@ -0,0 +1,1346 @@
> +/*
> + * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
> + * light, UV index and proximity sensors
> + *
> + * Copyright 2014 Peter Meerwald-Stadler <pmeerw@...erw.net>
Seems like you ought to have some copyright as well Leonard!
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License. See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * SI1132 (7-bit I2C slave address 0x60)
> + * SI1141/2/3 (7-bit I2C slave address 0x5a)
> + * SI1145/6/6 (7-bit I2C slave address 0x60)
> + *
> + * TODO: power management
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/irq.h>
> +#include <linux/gpio.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/util_macros.h>
> +
> +#define SI1145_REG_PART_ID 0x00
> +#define SI1145_REG_REV_ID 0x01
> +#define SI1145_REG_SEQ_ID 0x02
> +#define SI1145_REG_INT_CFG 0x03
> +#define SI1145_REG_IRQ_ENABLE 0x04
> +#define SI1145_REG_IRQ_MODE 0x05
> +#define SI1145_REG_HW_KEY 0x07
> +#define SI1145_REG_MEAS_RATE 0x08
> +#define SI1145_REG_PS_LED21 0x0f
> +#define SI1145_REG_PS_LED3 0x10
> +#define SI1145_REG_UCOEF1 0x13
> +#define SI1145_REG_UCOEF2 0x14
> +#define SI1145_REG_UCOEF3 0x15
> +#define SI1145_REG_UCOEF4 0x16
> +#define SI1145_REG_PARAM_WR 0x17
> +#define SI1145_REG_COMMAND 0x18
> +#define SI1145_REG_RESPONSE 0x20
> +#define SI1145_REG_IRQ_STATUS 0x21
> +#define SI1145_REG_ALSVIS_DATA 0x22
> +#define SI1145_REG_ALSIR_DATA 0x24
> +#define SI1145_REG_PS1_DATA 0x26
> +#define SI1145_REG_PS2_DATA 0x28
> +#define SI1145_REG_PS3_DATA 0x2a
> +#define SI1145_REG_AUX_DATA 0x2c
> +#define SI1145_REG_PARAM_RD 0x2e
> +#define SI1145_REG_CHIP_STAT 0x30
> +
> +#define SI1145_UCOEF1_DEFAULT 0x7b
> +#define SI1145_UCOEF2_DEFAULT 0x6b
> +#define SI1145_UCOEF3_DEFAULT 0x01
> +#define SI1145_UCOEF4_DEFAULT 0x00
> +
> +/* Helper to figure out PS_LED register / shift per channel */
> +#define SI1145_PS_LED_REG(ch) \
> + (((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
> +#define SI1145_PS_LED_SHIFT(ch) \
> + (((ch) == 1) ? 4 : 0)
> +
> +/* Parameter offsets */
> +#define SI1145_PARAM_CHLIST 0x01
> +#define SI1145_PARAM_PSLED12_SELECT 0x02
> +#define SI1145_PARAM_PSLED3_SELECT 0x03
> +#define SI1145_PARAM_PS_ENCODING 0x05
> +#define SI1145_PARAM_ALS_ENCODING 0x06
> +#define SI1145_PARAM_PS1_ADC_MUX 0x07
> +#define SI1145_PARAM_PS2_ADC_MUX 0x08
> +#define SI1145_PARAM_PS3_ADC_MUX 0x09
> +#define SI1145_PARAM_PS_ADC_COUNTER 0x0a
> +#define SI1145_PARAM_PS_ADC_GAIN 0x0b
> +#define SI1145_PARAM_PS_ADC_MISC 0x0c
> +#define SI1145_PARAM_ALS_ADC_MUX 0x0d
> +#define SI1145_PARAM_ALSIR_ADC_MUX 0x0e
> +#define SI1145_PARAM_AUX_ADC_MUX 0x0f
> +#define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10
> +#define SI1145_PARAM_ALSVIS_ADC_GAIN 0x11
> +#define SI1145_PARAM_ALSVIS_ADC_MISC 0x12
> +#define SI1145_PARAM_LED_RECOVERY 0x1c
> +#define SI1145_PARAM_ALSIR_ADC_COUNTER 0x1d
> +#define SI1145_PARAM_ALSIR_ADC_GAIN 0x1e
> +#define SI1145_PARAM_ALSIR_ADC_MISC 0x1f
> +#define SI1145_PARAM_ADC_OFFSET 0x1a
> +
> +/* Channel enable masks for CHLIST parameter */
> +#define SI1145_CHLIST_EN_PS1 0x01
> +#define SI1145_CHLIST_EN_PS2 0x02
> +#define SI1145_CHLIST_EN_PS3 0x04
> +#define SI1145_CHLIST_EN_ALSVIS 0x10
> +#define SI1145_CHLIST_EN_ALSIR 0x20
> +#define SI1145_CHLIST_EN_AUX 0x40
> +#define SI1145_CHLIST_EN_UV 0x80
> +
> +/* Signal range mask for ADC_MISC parameter */
> +#define SI1145_ADC_MISC_RANGE 0x20
> +
> +/* Commands for REG_COMMAND */
> +#define SI1145_CMD_NOP 0x00
> +#define SI1145_CMD_RESET 0x01
> +#define SI1145_CMD_PS_FORCE 0x05
> +#define SI1145_CMD_ALS_FORCE 0x06
> +#define SI1145_CMD_PSALS_FORCE 0x07
> +#define SI1145_CMD_PS_PAUSE 0x09
> +#define SI1145_CMD_ALS_PAUSE 0x0a
> +#define SI1145_CMD_PSALS_PAUSE 0x0b
> +#define SI1145_CMD_PS_AUTO 0x0d
> +#define SI1145_CMD_ALS_AUTO 0x0e
> +#define SI1145_CMD_PSALS_AUTO 0x0f
> +#define SI1145_CMD_PARAM_QUERY 0x80
> +#define SI1145_CMD_PARAM_SET 0xa0
> +
> +#define SI1145_RSP_INVALID_SETTING 0x80
> +#define SI1145_RSP_COUNTER_MASK 0x0F
> +
> +/* Minimum sleep after each command to ensure it's received */
> +#define SI1145_COMMAND_MIN_SLEEP_MS 5
> +/* Return -ETIMEDOUT after this long */
> +#define SI1145_COMMAND_TIMEOUT_MS 25
> +
> +/* Interrupt configuration masks for INT_CFG register */
> +#define SI1145_INT_CFG_OE 0x01 /* enable interrupt */
> +#define SI1145_INT_CFG_MODE 0x02 /* auto reset interrupt pin */
> +
> +/* Interrupt enable masks for IRQ_ENABLE register */
> +#define SI1145_BIT_PS3_IE 0x10
> +#define SI1145_BIT_PS2_IE 0x08
> +#define SI1145_BIT_PS1_IE 0x04
> +#define SI1145_BIT_ALS_IE 0x01
> +#define SI1145_MASK_ALL_IE 0x1d
> +
> +#define SI1145_MUX_TEMP 0x65
> +#define SI1145_MUX_VDD 0x75
> +
> +enum {
> + SI1132,
> + SI1141,
> + SI1142,
> + SI1143,
> + SI1145,
> + SI1146,
> + SI1147,
> +};
> +
> +struct si1145_part_info {
> + u8 part;
> + const struct iio_info *iio_info;
> + const struct iio_chan_spec *channels;
> + unsigned int num_channels;
> + unsigned int num_leds;
> + bool uncompressed_meas_rate;
> +};
> +
> +/**
> + * struct si1145_data - si1145 chip state data
> + * @client: I2C client
Please document all parameters.
> + * @cmdlock: mutex to protect command execution only
> + * @rsp_seq: Next expected response number or -1 if counter reset required
> + * @lock: mutex to protect shared state.
> + * @part_info: Part information
> + * @meas_rate: Value of MEAS_RATE register. Only set in HW in auto mode
> + **/
> +struct si1145_data {
> + struct i2c_client *client;
> + struct mutex lock;
> + struct mutex cmdlock;
> + int rsp_seq;
> + const struct si1145_part_info *part_info;
> + unsigned long scan_mask;
> + bool autonomous;
> + struct iio_trigger *trig;
> + int meas_rate;
> +};
> +
> +/* Send CMD_NOP and wait for response 0
> + *
> + * Returns 0 on success and -errno on error.
> + *
> + * Does not modify data->rsp_seq
> + */
> +static int __si1145_command_reset(struct si1145_data *data)
> +{
> + struct device *dev = &data->client->dev;
> + unsigned long start_jiffies = jiffies;
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, SI1145_CMD_NOP);
> + if (ret < 0)
> + return ret;
> + msleep(SI1145_COMMAND_MIN_SLEEP_MS);
> +
> + while (true) {
> + ret = i2c_smbus_read_byte_data(data->client, SI1145_REG_RESPONSE);
> + if (ret < 0)
> + return ret;
> + if (ret == 0)
> + return 0;
> + if (time_after(jiffies, start_jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000)) {
> + dev_warn(dev, "timeout on reset\n");
> + return -ETIMEDOUT;
> + }
> + msleep(5);
> + continue;
> + }
> +}
> +
> +/* Execute a command and poll the response register
Please fix up comment syntax throughout...
> + *
> + * Returns 0 on success or -errno on failure
> + *
> + * All conversion overflows are reported as -EOVERFLOW
> + * INVALID_SETTING is reported as -EINVAL
> + * Timeouts are reported as -ETIMEDOUT
> + */
> +static int si1145_command(struct si1145_data *data, u8 cmd)
> +{
> + struct device *dev = &data->client->dev;
> + unsigned long start_jiffies = jiffies;
> + int ret;
> +
> + mutex_lock(&data->cmdlock);
> +
> + if (data->rsp_seq < 0) {
> + ret = __si1145_command_reset(data);
> + if (ret < 0) {
> + dev_err(dev, "Failed to reset command counter: %d\n", ret);
> + goto out;
> + }
> + data->rsp_seq = 0;
> + }
> +
> + ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
> + if (ret) {
> + dev_warn(dev, "failed to write command ret=%d\n", ret);
> + goto out;
> + }
> + /* Sleep a little to ensure the command is received */
> + msleep(SI1145_COMMAND_MIN_SLEEP_MS);
> +
> + while (true) {
> + ret = i2c_smbus_read_byte_data(data->client, SI1145_REG_RESPONSE);
> + if (ret < 0) {
> + dev_warn(dev, "failed to read response ret=%d\n", ret);
> + goto out;
> + }
> +
> + if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
> + if (ret == data->rsp_seq) {
> + if (time_after(jiffies, start_jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000)) {
> + dev_warn(dev, "timeout on command %#02hhx\n", cmd);
> + ret = -ETIMEDOUT;
> + goto out;
> + }
> + msleep(5);
> + continue;
> + }
> + if (ret == ((data->rsp_seq + 1) & SI1145_RSP_COUNTER_MASK)) {
> + data->rsp_seq = ret;
> + ret = 0;
> + goto out;
> + }
> + dev_warn(dev, "Unexpected response counter %d instead of %d\n",
> + ret, (data->rsp_seq + 1) & SI1145_RSP_COUNTER_MASK);
> + /* Force a counter reset next time */
> + data->rsp_seq = -1;
> + ret = -EIO;
> + goto out;
> + } else {
> + if (ret == SI1145_RSP_INVALID_SETTING) {
> + dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n", cmd);
> + ret = -EINVAL;
> + } else {
> + /* All overflows are treated identically */
> + dev_dbg(dev, "Overflow ret=%#02hhx cmd=%#02hhx\n", ret, cmd);
> + ret = -EOVERFLOW;
> + }
> + /* Force a counter reset next time */
> + data->rsp_seq = -1;
> + goto out;
> + }
> + }
> +
> +out:
> + mutex_unlock(&data->cmdlock);
> + return ret;
> +}
> +
> +static int si1145_param_update(struct si1145_data *data, u8 op, u8 param, u8 value)
> +{
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_PARAM_WR, value);
> + if (ret < 0)
> + return ret;
> +
> + return si1145_command(data, op | (param & 0x1F));
> +}
> +
> +static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
> +{
> + return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
> +}
> +
> +/* Set param. Returns negative errno or current value */
> +static int si1145_param_query(struct si1145_data *data, u8 param)
> +{
> + int ret;
> +
> + ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
> +}
> +
> +/* expand 8 bit compressed value to 16 bit, see Silabs AN498 */
> +static u16 si1145_uncompress(u8 x)
> +{
> + u16 result = 0;
> + u8 exponent = 0;
> +
> + if (x < 8)
> + return 0;
> +
> + exponent = (x & 0xf0) >> 4;
> + result = 0x10 | (x & 0x0f);
> +
> + if (exponent >= 4)
> + return result << (exponent - 4);
> + return result >> (4 - exponent);
> +}
> +
> +/* compress 16 bit to 8 bit using 4 bit exponent and 4 bit fraction,
> + * see Silabs AN498 */
> +static u8 si1145_compress(u16 x)
> +{
> + u32 exponent = 0;
> + u32 significand = 0;
> + u32 tmp = x;
> +
> + if (x == 0x0000)
> + return 0x00;
> + if (x == 0x0001)
> + return 0x08;
> +
> + while (1) {
> + tmp >>= 1;
> + exponent += 1;
> + if (tmp == 1)
> + break;
> + }
> +
> + if (exponent < 5) {
> + significand = x << (4 - exponent);
> + return (exponent << 4) | (significand & 0xF);
> + }
> +
> + significand = x >> (exponent - 5);
> + if (significand & 1) {
> + significand += 2;
> + if (significand & 0x0040) {
> + exponent += 1;
> + significand >>= 1;
> + }
> + }
> +
> + return (exponent << 4) | ((significand >> 1) & 0xF);
> +}
> +
> +/* Write meas_rate in hardware */
> +static int si1145_set_meas_rate(struct si1145_data *data, int interval)
> +{
> + if (data->part_info->uncompressed_meas_rate)
> + return i2c_smbus_write_word_data(data->client,
> + SI1145_REG_MEAS_RATE, interval);
> + else
> + return i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_MEAS_RATE, interval);
> +}
> +
> +static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
> +{
> + *val = 32000;
> + if (data->part_info->uncompressed_meas_rate)
> + *val2 = data->meas_rate;
> + else
> + *val2 = si1145_uncompress(data->meas_rate);
> + return IIO_VAL_FRACTIONAL;
> +}
> +
> +/* Set the samp freq in driver private data */
> +static int si1145_store_samp_freq(struct si1145_data *data, int val)
> +{
> + int ret = 0;
> + int meas_rate;
> +
> + if (val <= 0 || val > 32000)
> + return -ERANGE;
> + meas_rate = 32000 / val;
> +
> + mutex_lock(&data->lock);
> + if (data->autonomous) {
> + ret = si1145_set_meas_rate(data, meas_rate);
> + if (ret)
> + goto out;
> + }
> + if (data->part_info->uncompressed_meas_rate)
> + data->meas_rate = meas_rate;
> + else
> + data->meas_rate = si1145_compress(meas_rate);
> +
> +out:
> + mutex_unlock(&data->lock);
> + return ret;
> +}
> +
> +static irqreturn_t si1145_trigger_handler(int irq, void *private)
> +{
> + struct iio_poll_func *pf = private;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct si1145_data *data = iio_priv(indio_dev);
> + /*
> + * Maximum buffer size:
> + * 6*2 bytes channels data + 4 bytes alignment +
> + * 8 bytes timestamp
> + */
Nice comment. If every driver put it like this we'd get far fewer
bugs around the size of buffer.
> + u8 buffer[24];
> + int i, j = 0;
> + int ret;
> + u8 irq_status = 0;
> +
> + if (!data->autonomous) {
> + ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
> + if (ret < 0 && ret != -EOVERFLOW)
> + goto done;
> + } else {
> + irq_status = ret = i2c_smbus_read_byte_data(data->client,
> + SI1145_REG_IRQ_STATUS);
> + if (ret < 0)
> + goto done;
> + if (!(irq_status & SI1145_MASK_ALL_IE))
> + goto done;
> + }
> +
> + for_each_set_bit(i, indio_dev->active_scan_mask,
> + indio_dev->masklength) {
> + int run = 1;
> +
> + while (i + run < indio_dev->masklength) {
> + if (!test_bit(i + run, indio_dev->active_scan_mask))
> + break;
> + if (indio_dev->channels[i + run].address !=
> + indio_dev->channels[i].address + 2 * run)
> + break;
> + run++;
> + }
> +
> + if (run > 1) {
> + ret = i2c_smbus_read_i2c_block_data(data->client,
> + indio_dev->channels[i].address,
> + sizeof(u16) * run, &buffer[j]);
> + } else {
> + ret = i2c_smbus_read_word_data(data->client,
> + indio_dev->channels[i].address);
> + *(u16 *) &buffer[j] = ret;
Hmm. Is there an endianness issue here... Block data
doesn't care, wherease _word data will convert to cpu endian.
Also, would it matter if we just dropped the special case?
If it is more complex than that, please add some explanatory comments.
> + }
> + if (ret < 0)
> + goto done;
> + j += run * sizeof(u16);
> + i += run - 1;
> + }
> +
> + if (data->autonomous) {
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_IRQ_STATUS,
> + irq_status & SI1145_MASK_ALL_IE);
> + if (ret < 0)
> + goto done;
> + }
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, buffer,
> + iio_get_time_ns());
> +
> +done:
> + iio_trigger_notify_done(indio_dev->trig);
> + return IRQ_HANDLED;
> +}
> +
> +static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + u8 reg = 0, mux;
> + int ret;
> + int i;
> +
> + /* channel list already set, no need to reprogram */
> + if (data->scan_mask == scan_mask)
> + return 0;
> +
> + for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
> + switch (indio_dev->channels[i].address) {
> + case SI1145_REG_ALSVIS_DATA:
> + reg |= SI1145_CHLIST_EN_ALSVIS;
> + break;
> + case SI1145_REG_ALSIR_DATA:
> + reg |= SI1145_CHLIST_EN_ALSIR;
> + break;
> + case SI1145_REG_PS1_DATA:
> + reg |= SI1145_CHLIST_EN_PS1;
> + break;
> + case SI1145_REG_PS2_DATA:
> + reg |= SI1145_CHLIST_EN_PS2;
> + break;
> + case SI1145_REG_PS3_DATA:
> + reg |= SI1145_CHLIST_EN_PS3;
> + break;
> + case SI1145_REG_AUX_DATA:
> + switch (indio_dev->channels[i].type) {
> + case IIO_UVINDEX:
> + reg |= SI1145_CHLIST_EN_UV;
> + break;
> + default:
> + reg |= SI1145_CHLIST_EN_AUX;
> + if (indio_dev->channels[i].type == IIO_TEMP)
> + mux = SI1145_MUX_TEMP;
> + else
> + mux = SI1145_MUX_VDD;
> + ret = si1145_param_set(data,
> + SI1145_PARAM_AUX_ADC_MUX, mux);
> + if (ret < 0)
> + return ret;
> +
> + break;
> + }
> + }
> + }
> +
> + data->scan_mask = scan_mask;
> + ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
> +
> + return ret < 0 ? ret : 0;
> +}
> +
> +static int si1145_measure(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + u8 cmd;
> + int ret;
> +
> + ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
> + if (ret < 0)
> + return ret;
> +
> + cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
> + SI1145_CMD_ALS_FORCE;
> + ret = si1145_command(data, cmd);
> + if (ret < 0 && ret != -EOVERFLOW)
> + return ret;
> +
> + return i2c_smbus_read_word_data(data->client, chan->address);
> +}
> +
> +/*
> + * Conversion between iio scale and ADC_GAIN values
> + * These could be further adjusted but proximity/intensity are dimensionless
> + */
> +static const int si1145_proximity_scale_available[] = {128,64,32,16,8,4};
> +static const int si1145_intensity_scale_available[] = {128,64,32,16,8,4,2,1};
> +static IIO_CONST_ATTR(in_proximity_scale_available, "128 64 32 16 8 4");
> +static IIO_CONST_ATTR(in_intensity_scale_available, "128 64 32 16 8 4 2 1");
> +static IIO_CONST_ATTR(in_intensity_ir_scale_available, "128 64 32 16 8 4 2 1");
> +
> +static int si1145_scale_from_adcgain(int regval)
> +{
> + return 128 >> regval;
> +}
> +
> +static int si1145_proximity_adcgain_from_scale(int val, int val2)
> +{
> + val = find_closest_descending(val, si1145_proximity_scale_available,
> + ARRAY_SIZE(si1145_proximity_scale_available));
> + if (val < 0 || val > 5 || val2 != 0)
> + return -EINVAL;
> +
> + return val;
> +}
> +
> +static int si1145_intensity_adcgain_from_scale(int val, int val2)
> +{
> + val = find_closest_descending(val, si1145_intensity_scale_available,
> + ARRAY_SIZE(si1145_intensity_scale_available));
> + if (val < 0 || val > 7 || val2 != 0)
> + return -EINVAL;
> +
> + return val;
> +}
> +
> +static int si1145_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + int ret;
> + u8 reg;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + switch (chan->type) {
> + case IIO_INTENSITY:
> + case IIO_PROXIMITY:
> + case IIO_VOLTAGE:
> + case IIO_TEMP:
> + case IIO_UVINDEX:
> + if (iio_buffer_enabled(indio_dev))
> + return -EBUSY;
> +
> + mutex_lock(&data->lock);
> + ret = si1145_measure(indio_dev, chan);
> + mutex_unlock(&data->lock);
> + if (ret < 0)
> + return ret;
> +
> + *val = ret;
> +
> + return IIO_VAL_INT;
> + case IIO_CURRENT:
> + ret = i2c_smbus_read_byte_data(data->client,
> + SI1145_PS_LED_REG(chan->channel));
> + if (ret < 0)
> + return ret;
> +
> + *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
> + & 0x0f;
> +
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> + case IIO_CHAN_INFO_SCALE:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + reg = SI1145_PARAM_PS_ADC_GAIN;
> + break;
> + case IIO_INTENSITY:
> + if (chan->channel2 == IIO_MOD_LIGHT_IR)
> + reg = SI1145_PARAM_ALSIR_ADC_GAIN;
> + else
> + reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
> + break;
> + case IIO_TEMP:
> + *val = 28;
> + *val2 = 571429;
> + return IIO_VAL_INT_PLUS_MICRO;
> + case IIO_UVINDEX:
> + *val = 0;
> + *val2 = 10000;
> + return IIO_VAL_INT_PLUS_MICRO;
> + default:
> + return -EINVAL;
> + }
> +
> + ret = si1145_param_query(data, reg);
> + if (ret < 0)
> + return ret;
> +
> + *val = si1145_scale_from_adcgain(ret & 0x07);
> +
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_OFFSET:
> + switch (chan->type) {
> + case IIO_TEMP:
> + /* -ADC offset - ADC counts @ 25°C - 35 * ADC counts / °C */
> + *val = -256 - 11136 + 25 * 35;
> + return IIO_VAL_INT;
> + default:
> + /*
> + * All ADC measurements have are by default offset by -256
> + * See AN498 5.6.3
> + */
> + ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
> + if (ret < 0)
> + return ret;
> + *val = -si1145_uncompress(ret);
> + return IIO_VAL_INT;
> + }
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return si1145_read_samp_freq(data, val, val2);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int si1145_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + u8 reg1, reg2, shift;
> + int ret;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SCALE:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + val = si1145_proximity_adcgain_from_scale(val, val2);
> + if (val < 0)
> + return val;
> + reg1 = SI1145_PARAM_PS_ADC_GAIN;
> + reg2 = SI1145_PARAM_PS_ADC_COUNTER;
> + break;
> + case IIO_INTENSITY:
> + val = si1145_intensity_adcgain_from_scale(val, val2);
> + if (val < 0)
> + return val;
> + if (chan->channel2 == IIO_MOD_LIGHT_IR) {
> + reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
> + reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
> + } else {
> + reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
> + reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
> + }
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + ret = si1145_param_set(data, reg1, val);
> + if (ret < 0)
> + return ret;
> + /* Set recovery period to one's complement of gain */
> + return si1145_param_set(data, reg2, (~val & 0x07) << 4);
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type != IIO_CURRENT)
> + return -EINVAL;
> +
> + if (val < 0 || val > 15 || val2 != 0)
> + return -EINVAL;
> +
> + reg1 = SI1145_PS_LED_REG(chan->channel);
> + shift = SI1145_PS_LED_SHIFT(chan->channel);
> + ret = i2c_smbus_read_byte_data(data->client, reg1);
> + if (ret < 0)
> + return ret;
> + return i2c_smbus_write_byte_data(data->client, reg1,
> + (ret & ~(0x0f << shift)) |
> + ((val & 0x0f) << shift));
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return si1145_store_samp_freq(data, val);
> + }
> + return -EINVAL;
> +}
> +
> +#define SI1145_ST { \
> + .sign = 'u', \
> + .realbits = 16, \
> + .storagebits = 16, \
> + .endianness = IIO_LE, \
> +}
> +
> +#define SI1145_INTENSITY_CHANNEL(_si) { \
> + .type = IIO_INTENSITY, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_OFFSET) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_ALSVIS_DATA, \
> +}
> +
> +#define SI1145_INTENSITY_IR_CHANNEL(_si) { \
> + .type = IIO_INTENSITY, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_OFFSET) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .modified = 1, \
> + .channel2 = IIO_MOD_LIGHT_IR, \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_ALSIR_DATA, \
> +}
> +
> +#define SI1145_TEMP_CHANNEL(_si) { \
> + .type = IIO_TEMP, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_OFFSET) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_AUX_DATA, \
> +}
> +
> +#define SI1145_UV_CHANNEL(_si) { \
> + .type = IIO_UVINDEX, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_AUX_DATA, \
> +}
> +
> +#define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
> + .type = IIO_PROXIMITY, \
> + .indexed = 1, \
> + .channel = _ch, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_OFFSET), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_PS1_DATA + _ch * 2, \
> +}
> +
> +#define SI1145_VOLTAGE_CHANNEL(_si) { \
> + .type = IIO_VOLTAGE, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_type = SI1145_ST, \
> + .scan_index = _si, \
> + .address = SI1145_REG_AUX_DATA, \
> +}
> +
> +#define SI1145_CURRENT_CHANNEL(_ch) { \
> + .type = IIO_CURRENT, \
> + .indexed = 1, \
> + .channel = _ch, \
> + .output = 1, \
> + .scan_index = -1, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> +}
> +
> +static const struct iio_chan_spec si1132_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_TEMP_CHANNEL(2),
> + SI1145_VOLTAGE_CHANNEL(3),
> + SI1145_UV_CHANNEL(4),
> + IIO_CHAN_SOFT_TIMESTAMP(6),
> +};
> +
> +static const struct iio_chan_spec si1141_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_PROXIMITY_CHANNEL(2, 0),
> + SI1145_TEMP_CHANNEL(3),
> + SI1145_VOLTAGE_CHANNEL(4),
> + IIO_CHAN_SOFT_TIMESTAMP(5),
> + SI1145_CURRENT_CHANNEL(0),
> +};
> +
> +static const struct iio_chan_spec si1142_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_PROXIMITY_CHANNEL(2, 0),
> + SI1145_PROXIMITY_CHANNEL(3, 1),
> + SI1145_TEMP_CHANNEL(4),
> + SI1145_VOLTAGE_CHANNEL(5),
> + IIO_CHAN_SOFT_TIMESTAMP(6),
> + SI1145_CURRENT_CHANNEL(0),
> + SI1145_CURRENT_CHANNEL(1),
> +};
> +
> +static const struct iio_chan_spec si1143_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_PROXIMITY_CHANNEL(2, 0),
> + SI1145_PROXIMITY_CHANNEL(3, 1),
> + SI1145_PROXIMITY_CHANNEL(4, 2),
> + SI1145_TEMP_CHANNEL(5),
> + SI1145_VOLTAGE_CHANNEL(6),
> + IIO_CHAN_SOFT_TIMESTAMP(7),
> + SI1145_CURRENT_CHANNEL(0),
> + SI1145_CURRENT_CHANNEL(1),
> + SI1145_CURRENT_CHANNEL(2),
> +};
> +
> +static const struct iio_chan_spec si1145_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_PROXIMITY_CHANNEL(2, 0),
> + SI1145_TEMP_CHANNEL(3),
> + SI1145_VOLTAGE_CHANNEL(4),
> + SI1145_UV_CHANNEL(5),
> + IIO_CHAN_SOFT_TIMESTAMP(6),
> + SI1145_CURRENT_CHANNEL(0),
> +};
> +
> +static const struct iio_chan_spec si1146_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_TEMP_CHANNEL(2),
> + SI1145_VOLTAGE_CHANNEL(3),
> + SI1145_UV_CHANNEL(4),
> + SI1145_PROXIMITY_CHANNEL(5, 0),
> + SI1145_PROXIMITY_CHANNEL(6, 1),
> + IIO_CHAN_SOFT_TIMESTAMP(7),
> + SI1145_CURRENT_CHANNEL(0),
> + SI1145_CURRENT_CHANNEL(1),
> +};
> +
> +static const struct iio_chan_spec si1147_channels[] = {
> + SI1145_INTENSITY_CHANNEL(0),
> + SI1145_INTENSITY_IR_CHANNEL(1),
> + SI1145_PROXIMITY_CHANNEL(2, 0),
> + SI1145_PROXIMITY_CHANNEL(3, 1),
> + SI1145_PROXIMITY_CHANNEL(4, 2),
> + SI1145_TEMP_CHANNEL(5),
> + SI1145_VOLTAGE_CHANNEL(6),
> + SI1145_UV_CHANNEL(7),
> + IIO_CHAN_SOFT_TIMESTAMP(8),
> + SI1145_CURRENT_CHANNEL(0),
> + SI1145_CURRENT_CHANNEL(1),
> + SI1145_CURRENT_CHANNEL(2),
> +};
> +
> +static struct attribute *si1132_attributes[] = {
> + &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
> + &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static struct attribute *si114x_attributes[] = {
> + &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
> + &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
> + &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group si1132_attribute_group = {
> + .attrs = si1132_attributes,
> +};
> +
> +static const struct attribute_group si114x_attribute_group = {
> + .attrs = si114x_attributes,
> +};
> +
> +
> +static const struct iio_info si1132_info = {
> + .read_raw = si1145_read_raw,
> + .write_raw = si1145_write_raw,
> + .driver_module = THIS_MODULE,
> + .attrs = &si1132_attribute_group,
> +};
> +
> +static const struct iio_info si114x_info = {
> + .read_raw = si1145_read_raw,
> + .write_raw = si1145_write_raw,
> + .driver_module = THIS_MODULE,
> + .attrs = &si114x_attribute_group,
> +};
> +
> +#define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
> + {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
> +
> +static const struct si1145_part_info si1145_part_info[] = {
> + [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
> + [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
> + [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
> + [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
> + [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
> + [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
> + [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
> +};
> +
> +static int si1145_initialize(struct si1145_data *data)
> +{
> + struct i2c_client *client = data->client;
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
> + SI1145_CMD_RESET);
> + if (ret < 0)
> + return ret;
> + msleep(20);
> +
> + /* Hardware key, magic value */
> + ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
> + if (ret < 0)
> + return ret;
> + msleep(20);
> +
> + /* Turn off autonomous mode */
> + ret = si1145_set_meas_rate(data, 0);
> + if (ret < 0)
> + return ret;
> +
> + /* Initialize sampling freq to 10hz */
> + ret = si1145_store_samp_freq(data, 10);
> + if (ret < 0)
> + return ret;
> +
> + /* Set LED currents to 45 mA */
> + switch (data->part_info->num_leds) {
> + case 1:
> + ret = i2c_smbus_write_byte_data(client,
> + SI1145_REG_PS_LED21, 0x03);
> + break;
> + case 2:
> + ret = i2c_smbus_write_byte_data(client,
> + SI1145_REG_PS_LED21, 0x43);
> + break;
> + case 3:
> + ret = i2c_smbus_write_byte_data(client,
> + SI1145_REG_PS_LED3, 0x03);
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(client,
> + SI1145_REG_PS_LED21, 0x43);
> + break;
> + default:
> + ret = 0;
> + break;
> + }
> + if (ret < 0)
> + return ret;
> +
> + /* Set normal proximity measurement mode */
> + ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC, 0x04);
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x03 << 4);
> + if (ret < 0)
> + return ret;
> +
> + /* Set ALS visible measurement mode */
> + ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC, SI1145_ADC_MISC_RANGE);
Line looks a bit long...
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER, 0x04 << 4);
> + if (ret < 0)
> + return ret;
> +
> + /* Set ALS IR measurement mode */
> + ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC, SI1145_ADC_MISC_RANGE);
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
> + if (ret < 0)
> + return ret;
> +
> + ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER, 0x00 << 4);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * Initialize UCOEF to default values in datasheet
> + * These registers are normally zero on reset
> + */
> + if (data->part_info->part == 0x32 ||
> + data->part_info->part == 0x45 ||
> + data->part_info->part == 0x46 ||
> + data->part_info->part == 0x47)
> + {
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_UCOEF1, SI1145_UCOEF1_DEFAULT);
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int si1145_buffer_preenable(struct iio_dev *indio_dev)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&data->lock);
> + ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
> + mutex_unlock(&data->lock);
> +
> + return ret;
> +}
> +
> +bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
> + const unsigned long *scan_mask)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + unsigned int count = 0;
> + int i;
> +
> + /* Check that at most one AUX channel is enabled */
> + for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
> + if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
> + count++;
> + }
> +
> + return count <= 1;
> +}
> +
> +static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
> + .preenable = si1145_buffer_preenable,
> + .postenable = iio_triggered_buffer_postenable,
> + .predisable = iio_triggered_buffer_predisable,
> + .validate_scan_mask = si1145_validate_scan_mask,
> +};
> +
> +/* Set trigger state
Fix the multiline comment style please.
> + *
> + * When not using triggers interrupts are disabled and measurement rate is
> + * set to zero in order to minimize power consumption.
> + */
> +static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
> +{
> + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
> + struct si1145_data *data = iio_priv(indio_dev);
> + int err = 0, ret;
> +
> + mutex_lock(&data->lock);
> +
> + if (state) {
> + data->autonomous = true;
> + err = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
> + if (err < 0)
> + goto disable;
> + err = i2c_smbus_write_byte_data(data->client,
> + SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
> + if (err < 0)
> + goto disable;
> + err = si1145_set_meas_rate(data, data->meas_rate);
> + if (err < 0)
> + goto disable;
> + err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
> + if (err < 0)
> + goto disable;
> + } else {
> +disable:
> + /* Disable as much as possible skipping errors */
> + ret = si1145_command(data, state ? SI1145_CMD_PSALS_AUTO : SI1145_CMD_PSALS_PAUSE);
> + if (ret < 0 && !err)
> + err = ret;
> + ret = si1145_set_meas_rate(data, 0);
> + if (ret < 0 && !err)
> + err = ret;
> + ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_IRQ_ENABLE, 0);
> + if (ret < 0 && !err)
> + err = ret;
> + ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_INT_CFG, 0);
> + if (ret < 0 && !err)
> + err = ret;
> + data->autonomous = false;
> + }
> +
> + mutex_unlock(&data->lock);
> + return err;
> +}
> +
> +static const struct iio_trigger_ops si1145_trigger_ops = {
> + .owner = THIS_MODULE,
> + .set_trigger_state = si1145_trigger_set_state,
> +};
> +
> +static int si1145_probe_trigger(struct iio_dev *indio_dev)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + data->trig = devm_iio_trigger_alloc(&data->client->dev,
> + "%s-dev%d", indio_dev->name, indio_dev->id);
> + if (!data->trig)
> + return -ENOMEM;
> +
> + data->trig->dev.parent = &data->client->dev;
> + data->trig->ops = &si1145_trigger_ops;
> + iio_trigger_set_drvdata(data->trig, indio_dev);
> + ret = iio_trigger_register(data->trig);
> + if (ret)
> + return ret;
> +
> + /* select default trigger */
> + indio_dev->trig = data->trig;
> +
> + return 0;
> +}
> +
> +static void si1145_remove_trigger(struct iio_dev *indio_dev)
> +{
> + struct si1145_data *data = iio_priv(indio_dev);
> +
> + if (data->trig)
> + iio_trigger_unregister(data->trig);
> +}
> +
> +static int si1145_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct si1145_data *data;
> + struct iio_dev *indio_dev;
> + u8 part_id, rev_id, seq_id;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + data = iio_priv(indio_dev);
> + i2c_set_clientdata(client, indio_dev);
> + data->client = client;
> + data->part_info = &si1145_part_info[id->driver_data];
> +
> + part_id = ret = i2c_smbus_read_byte_data(data->client, SI1145_REG_PART_ID);
> + if (ret < 0)
> + return ret;
> + rev_id = ret = i2c_smbus_read_byte_data(data->client, SI1145_REG_REV_ID);
> + if (ret < 0)
> + return ret;
> + seq_id = ret = i2c_smbus_read_byte_data(data->client, SI1145_REG_SEQ_ID);
> + if (ret < 0)
> + return ret;
> + dev_info(&client->dev, "Device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
> + part_id, rev_id, seq_id);
> + if (part_id != data->part_info->part) {
> + dev_err(&client->dev, "part ID mismatch got %#02hhx expected %#02x\n",
> + part_id, data->part_info->part);
> + return -ENODEV;
> + }
> +
> + indio_dev->dev.parent = &client->dev;
> + indio_dev->name = id->name;
> + indio_dev->channels = data->part_info->channels;
> + indio_dev->num_channels = data->part_info->num_channels;
> + indio_dev->info = data->part_info->iio_info;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + mutex_init(&data->lock);
> + mutex_init(&data->cmdlock);
> +
> + ret = si1145_initialize(data);
> + if (ret < 0)
> + return ret;
> +
> + ret = iio_triggered_buffer_setup(indio_dev, NULL,
> + si1145_trigger_handler, &si1145_buffer_setup_ops);
> + if (ret < 0)
> + return ret;
> +
> + if (client->irq) {
> + ret = si1145_probe_trigger(indio_dev);
> + if (ret < 0)
> + goto error_free_buffer;
> +
> + ret = devm_request_irq(&client->dev,
> + client->irq,
> + iio_trigger_generic_data_rdy_poll,
> + IRQF_TRIGGER_FALLING,
> + "si1145_irq",
> + data->trig);
I'm not so keen on using devm here as it breaks the obviously correct rule.
You will end up unwinding the probe_trigger, before you unwind this
rather than the other way around. I know it's 'almost certainly fine'
but for a tiny bit more code, let's go with certainly ;)
> + if (ret < 0) {
> + dev_err(&client->dev, "irq request failed\n");
> + goto error_free_trigger;
> + }
> + } else {
> + dev_info(&client->dev, "no irq, using polling\n");
> + }
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0)
> + goto error_free_trigger;
> +
> + return 0;
> +
> +error_free_trigger:
> + si1145_remove_trigger(indio_dev);
> +error_free_buffer:
> + iio_triggered_buffer_cleanup(indio_dev);
> + return ret;
> +}
> +
> +static const struct i2c_device_id si1145_ids[] = {
> + { "si1132", SI1132 },
> + { "si1141", SI1141 },
> + { "si1142", SI1142 },
> + { "si1143", SI1143 },
> + { "si1145", SI1145 },
> + { "si1146", SI1146 },
> + { "si1147", SI1147 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, si1145_ids);
> +
> +static int si1145_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +
> + iio_device_unregister(indio_dev);
> + iio_triggered_buffer_cleanup(indio_dev);
> + si1145_remove_trigger(indio_dev);
> +
> + return 0;
> +}
> +
> +static struct i2c_driver si1145_driver = {
> + .driver = {
> + .name = "si1145",
> + .owner = THIS_MODULE,
> + },
> + .probe = si1145_probe,
> + .remove = si1145_remove,
> + .id_table = si1145_ids,
> +};
> +
> +module_i2c_driver(si1145_driver);
> +
> +MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@...erw.net>");
> +MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
> +MODULE_LICENSE("GPL");
>
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