diff options
Diffstat (limited to 'drivers/iio/light/si1145.c')
| -rw-r--r-- | drivers/iio/light/si1145.c | 1404 |
1 files changed, 1404 insertions, 0 deletions
diff --git a/drivers/iio/light/si1145.c b/drivers/iio/light/si1145.c new file mode 100644 index 000000000000..096034c126a4 --- /dev/null +++ b/drivers/iio/light/si1145.c @@ -0,0 +1,1404 @@ +/* + * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient + * light, UV index and proximity sensors + * + * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net> + * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com> + * + * 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) + */ + +#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 BIT(0) +#define SI1145_CHLIST_EN_PS2 BIT(1) +#define SI1145_CHLIST_EN_PS3 BIT(2) +#define SI1145_CHLIST_EN_ALSVIS BIT(4) +#define SI1145_CHLIST_EN_ALSIR BIT(5) +#define SI1145_CHLIST_EN_AUX BIT(6) +#define SI1145_CHLIST_EN_UV BIT(7) + +/* Proximity measurement mode for ADC_MISC parameter */ +#define SI1145_PS_ADC_MODE_NORMAL BIT(2) +/* Signal range mask for ADC_MISC parameter */ +#define SI1145_ADC_MISC_RANGE BIT(5) + +/* 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_MINSLEEP_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 BIT(0) /* enable interrupt */ +#define SI1145_INT_CFG_MODE BIT(1) /* auto reset interrupt pin */ + +/* Interrupt enable masks for IRQ_ENABLE register */ +#define SI1145_MASK_ALL_IE (BIT(4) | BIT(3) | BIT(2) | BIT(0)) + +#define SI1145_MUX_TEMP 0x65 +#define SI1145_MUX_VDD 0x75 + +/* Proximity LED current; see Table 2 in datasheet */ +#define SI1145_LED_CURRENT_45mA 0x04 + +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 + * @lock: mutex to protect shared state. + * @cmdlock: Low-level mutex to protect command execution only + * @rsp_seq: Next expected response number or -1 if counter reset required + * @scan_mask: Saved scan mask to avoid duplicate set_chlist + * @autonomous: If automatic measurements are active (for buffer support) + * @part_info: Part information + * @trig: Pointer to iio trigger + * @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; +}; + +/** + * __si1145_command_reset() - Send CMD_NOP and wait for response 0 + * + * Does not modify data->rsp_seq + * + * Return: 0 on success and -errno on error. + */ +static int __si1145_command_reset(struct si1145_data *data) +{ + struct device *dev = &data->client->dev; + unsigned long stop_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_MINSLEEP_MS); + + stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000; + while (true) { + ret = i2c_smbus_read_byte_data(data->client, + SI1145_REG_RESPONSE); + if (ret <= 0) + return ret; + if (time_after(jiffies, stop_jiffies)) { + dev_warn(dev, "timeout on reset\n"); + return -ETIMEDOUT; + } + msleep(SI1145_COMMAND_MINSLEEP_MS); + continue; + } +} + +/** + * si1145_command() - Execute a command and poll the response register + * + * All conversion overflows are reported as -EOVERFLOW + * INVALID_SETTING is reported as -EINVAL + * Timeouts are reported as -ETIMEDOUT + * + * Return: 0 on success or -errno on failure + */ +static int si1145_command(struct si1145_data *data, u8 cmd) +{ + struct device *dev = &data->client->dev; + unsigned long stop_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, ret=%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_MINSLEEP_MS); + + stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000; + 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); + break; + } + + if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) { + if (ret == data->rsp_seq) { + if (time_after(jiffies, stop_jiffies)) { + dev_warn(dev, "timeout on command %#02hhx\n", + cmd); + ret = -ETIMEDOUT; + break; + } + msleep(SI1145_COMMAND_MINSLEEP_MS); + continue; + } + if (ret == ((data->rsp_seq + 1) & + SI1145_RSP_COUNTER_MASK)) { + data->rsp_seq = ret; + ret = 0; + break; + } + dev_warn(dev, "unexpected response counter %d instead of %d\n", + ret, (data->rsp_seq + 1) & + SI1145_RSP_COUNTER_MASK); + ret = -EIO; + } 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=%d, cmd=%#02hhx\n", + ret, cmd); + ret = -EOVERFLOW; + } + } + + /* Force a counter reset next time */ + data->rsp_seq = -1; + break; + } + +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 value to 8 bit, 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 + */ + 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++; + } + + ret = i2c_smbus_read_i2c_block_data_or_emulated( + data->client, indio_dev->channels[i].address, + sizeof(u16) * run, &buffer[j]); + 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(indio_dev)); + +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: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + ret = si1145_measure(indio_dev, chan); + iio_device_release_direct_mode(indio_dev); + + 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 = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = si1145_param_set(data, reg1, val); + if (ret < 0) { + iio_device_release_direct_mode(indio_dev); + return ret; + } + /* Set recovery period to one's complement of gain */ + ret = si1145_param_set(data, reg2, (~val & 0x07) << 4); + iio_device_release_direct_mode(indio_dev); + return ret; + 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 = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = i2c_smbus_read_byte_data(data->client, reg1); + if (ret < 0) { + iio_device_release_direct_mode(indio_dev); + return ret; + } + ret = i2c_smbus_write_byte_data(data->client, reg1, + (ret & ~(0x0f << shift)) | + ((val & 0x0f) << shift)); + iio_device_release_direct_mode(indio_dev); + return ret; + case IIO_CHAN_INFO_SAMP_FREQ: + return si1145_store_samp_freq(data, val); + default: + 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(SI1145_COMMAND_TIMEOUT_MS); + + /* Hardware key, magic value */ + ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17); + if (ret < 0) + return ret; + msleep(SI1145_COMMAND_TIMEOUT_MS); + + /* Turn off autonomous mode */ + ret = si1145_set_meas_rate(data, 0); + if (ret < 0) + return ret; + + /* Initialize sampling freq to 10 Hz */ + ret = si1145_store_samp_freq(data, 10); + if (ret < 0) + return ret; + + /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */ + switch (data->part_info->num_leds) { + case 3: + ret = i2c_smbus_write_byte_data(client, + SI1145_REG_PS_LED3, + SI1145_LED_CURRENT_45mA); + if (ret < 0) + return ret; + /* fallthrough */ + case 2: + ret = i2c_smbus_write_byte_data(client, + SI1145_REG_PS_LED21, + (SI1145_LED_CURRENT_45mA << 4) | + SI1145_LED_CURRENT_45mA); + break; + case 1: + ret = i2c_smbus_write_byte_data(client, + SI1145_REG_PS_LED21, + SI1145_LED_CURRENT_45mA); + 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, + SI1145_PS_ADC_MODE_NORMAL); + if (ret < 0) + return ret; + + ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01); + if (ret < 0) + return ret; + + /* ADC_COUNTER should be one complement of ADC_GAIN */ + ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 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); + 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, + 0x06 << 4); + if (ret < 0) + return ret; + + /* + * Initialize UCOEF to default values in datasheet + * These registers are normally zero on reset + */ + if (data->part_info == &si1145_part_info[SI1132] || + data->part_info == &si1145_part_info[SI1145] || + data->part_info == &si1145_part_info[SI1146] || + data->part_info == &si1145_part_info[SI1147]) { + 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; +} + +/* + * Program the channels we want to measure with CMD_PSALS_AUTO. No need for + * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct) + * mode reprograms the channels list anyway... + */ +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; +} + +static 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, +}; + +/** + * si1145_trigger_set_state() - Set trigger state + * + * 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, 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); + struct i2c_client *client = data->client; + struct iio_trigger *trig; + int ret; + + trig = devm_iio_trigger_alloc(&client->dev, + "%s-dev%d", indio_dev->name, indio_dev->id); + if (!trig) + return -ENOMEM; + + trig->dev.parent = &client->dev; + trig->ops = &si1145_trigger_ops; + iio_trigger_set_drvdata(trig, indio_dev); + + ret = devm_request_irq(&client->dev, client->irq, + iio_trigger_generic_data_rdy_poll, + IRQF_TRIGGER_FALLING, + "si1145_irq", + trig); + if (ret < 0) { + dev_err(&client->dev, "irq request failed\n"); + return ret; + } + + ret = iio_trigger_register(trig); + if (ret) + return ret; + + data->trig = trig; + indio_dev->trig = iio_trigger_get(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); + data->trig = NULL; + } +} + +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; + } 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); + si1145_remove_trigger(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + + return 0; +} + +static struct i2c_driver si1145_driver = { + .driver = { + .name = "si1145", + }, + .probe = si1145_probe, + .remove = si1145_remove, + .id_table = si1145_ids, +}; + +module_i2c_driver(si1145_driver); + +MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>"); +MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver"); +MODULE_LICENSE("GPL"); |