| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Device driver for monitoring ambient light intensity (lux) |
| * within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583). |
| * |
| * Copyright (c) 2011, TAOS Corporation. |
| * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/i2c.h> |
| #include <linux/errno.h> |
| #include <linux/delay.h> |
| #include <linux/string.h> |
| #include <linux/mutex.h> |
| #include <linux/unistd.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| #include <linux/pm_runtime.h> |
| |
| /* Device Registers and Masks */ |
| #define TSL2583_CNTRL 0x00 |
| #define TSL2583_ALS_TIME 0X01 |
| #define TSL2583_INTERRUPT 0x02 |
| #define TSL2583_GAIN 0x07 |
| #define TSL2583_REVID 0x11 |
| #define TSL2583_CHIPID 0x12 |
| #define TSL2583_ALS_CHAN0LO 0x14 |
| #define TSL2583_ALS_CHAN0HI 0x15 |
| #define TSL2583_ALS_CHAN1LO 0x16 |
| #define TSL2583_ALS_CHAN1HI 0x17 |
| #define TSL2583_TMR_LO 0x18 |
| #define TSL2583_TMR_HI 0x19 |
| |
| /* tsl2583 cmd reg masks */ |
| #define TSL2583_CMD_REG 0x80 |
| #define TSL2583_CMD_SPL_FN 0x60 |
| #define TSL2583_CMD_ALS_INT_CLR 0x01 |
| |
| /* tsl2583 cntrl reg masks */ |
| #define TSL2583_CNTL_ADC_ENBL 0x02 |
| #define TSL2583_CNTL_PWR_OFF 0x00 |
| #define TSL2583_CNTL_PWR_ON 0x01 |
| |
| /* tsl2583 status reg masks */ |
| #define TSL2583_STA_ADC_VALID 0x01 |
| #define TSL2583_STA_ADC_INTR 0x10 |
| |
| /* Lux calculation constants */ |
| #define TSL2583_LUX_CALC_OVER_FLOW 65535 |
| |
| #define TSL2583_INTERRUPT_DISABLED 0x00 |
| |
| #define TSL2583_CHIP_ID 0x90 |
| #define TSL2583_CHIP_ID_MASK 0xf0 |
| |
| #define TSL2583_POWER_OFF_DELAY_MS 2000 |
| |
| /* Per-device data */ |
| struct tsl2583_als_info { |
| u16 als_ch0; |
| u16 als_ch1; |
| u16 lux; |
| }; |
| |
| struct tsl2583_lux { |
| unsigned int ratio; |
| unsigned int ch0; |
| unsigned int ch1; |
| }; |
| |
| static const struct tsl2583_lux tsl2583_default_lux[] = { |
| { 9830, 8520, 15729 }, |
| { 12452, 10807, 23344 }, |
| { 14746, 6383, 11705 }, |
| { 17695, 4063, 6554 }, |
| { 0, 0, 0 } /* Termination segment */ |
| }; |
| |
| #define TSL2583_MAX_LUX_TABLE_ENTRIES 11 |
| |
| struct tsl2583_settings { |
| int als_time; |
| int als_gain; |
| int als_gain_trim; |
| int als_cal_target; |
| |
| /* |
| * This structure is intentionally large to accommodate updates via |
| * sysfs. Sized to 11 = max 10 segments + 1 termination segment. |
| * Assumption is that one and only one type of glass used. |
| */ |
| struct tsl2583_lux als_device_lux[TSL2583_MAX_LUX_TABLE_ENTRIES]; |
| }; |
| |
| struct tsl2583_chip { |
| struct mutex als_mutex; |
| struct i2c_client *client; |
| struct tsl2583_als_info als_cur_info; |
| struct tsl2583_settings als_settings; |
| int als_time_scale; |
| int als_saturation; |
| }; |
| |
| struct gainadj { |
| s16 ch0; |
| s16 ch1; |
| s16 mean; |
| }; |
| |
| /* Index = (0 - 3) Used to validate the gain selection index */ |
| static const struct gainadj gainadj[] = { |
| { 1, 1, 1 }, |
| { 8, 8, 8 }, |
| { 16, 16, 16 }, |
| { 107, 115, 111 } |
| }; |
| |
| /* |
| * Provides initial operational parameter defaults. |
| * These defaults may be changed through the device's sysfs files. |
| */ |
| static void tsl2583_defaults(struct tsl2583_chip *chip) |
| { |
| /* |
| * The integration time must be a multiple of 50ms and within the |
| * range [50, 600] ms. |
| */ |
| chip->als_settings.als_time = 100; |
| |
| /* |
| * This is an index into the gainadj table. Assume clear glass as the |
| * default. |
| */ |
| chip->als_settings.als_gain = 0; |
| |
| /* Default gain trim to account for aperture effects */ |
| chip->als_settings.als_gain_trim = 1000; |
| |
| /* Known external ALS reading used for calibration */ |
| chip->als_settings.als_cal_target = 130; |
| |
| /* Default lux table. */ |
| memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux, |
| sizeof(tsl2583_default_lux)); |
| } |
| |
| /* |
| * Reads and calculates current lux value. |
| * 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. The array als_device_lux[] |
| * declared above 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 tsl2583_get_lux(struct iio_dev *indio_dev) |
| { |
| u16 ch0, ch1; /* separated ch0/ch1 data from device */ |
| u32 lux; /* raw lux calculated from device data */ |
| u64 lux64; |
| u32 ratio; |
| u8 buf[5]; |
| struct tsl2583_lux *p; |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int i, ret; |
| |
| ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, "%s: failed to read CMD_REG register\n", |
| __func__); |
| goto done; |
| } |
| |
| /* is data new & valid */ |
| if (!(ret & TSL2583_STA_ADC_INTR)) { |
| dev_err(&chip->client->dev, "%s: data not valid; returning last value\n", |
| __func__); |
| ret = chip->als_cur_info.lux; /* return LAST VALUE */ |
| goto done; |
| } |
| |
| for (i = 0; i < 4; i++) { |
| int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i); |
| |
| ret = i2c_smbus_read_byte_data(chip->client, reg); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, "%s: failed to read register %x\n", |
| __func__, reg); |
| goto done; |
| } |
| buf[i] = ret; |
| } |
| |
| /* |
| * Clear the pending interrupt status bit on the chip to allow the next |
| * integration cycle to start. This has to be done even though this |
| * driver currently does not support interrupts. |
| */ |
| ret = i2c_smbus_write_byte(chip->client, |
| (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN | |
| TSL2583_CMD_ALS_INT_CLR)); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, "%s: failed to clear the interrupt bit\n", |
| __func__); |
| goto done; /* have no data, so return failure */ |
| } |
| |
| /* extract ALS/lux data */ |
| ch0 = le16_to_cpup((const __le16 *)&buf[0]); |
| ch1 = le16_to_cpup((const __le16 *)&buf[2]); |
| |
| chip->als_cur_info.als_ch0 = ch0; |
| chip->als_cur_info.als_ch1 = ch1; |
| |
| if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation)) |
| goto return_max; |
| |
| if (!ch0) { |
| /* |
| * The sensor appears to be in total darkness so set the |
| * calculated lux to 0 and return early to avoid a division by |
| * zero below when calculating the ratio. |
| */ |
| ret = 0; |
| chip->als_cur_info.lux = 0; |
| goto done; |
| } |
| |
| /* calculate ratio */ |
| ratio = (ch1 << 15) / ch0; |
| |
| /* convert to unscaled lux using the pointer to the table */ |
| for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux; |
| p->ratio != 0 && p->ratio < ratio; p++) |
| ; |
| |
| if (p->ratio == 0) { |
| lux = 0; |
| } else { |
| u32 ch0lux, ch1lux; |
| |
| ch0lux = ((ch0 * p->ch0) + |
| (gainadj[chip->als_settings.als_gain].ch0 >> 1)) |
| / gainadj[chip->als_settings.als_gain].ch0; |
| ch1lux = ((ch1 * p->ch1) + |
| (gainadj[chip->als_settings.als_gain].ch1 >> 1)) |
| / gainadj[chip->als_settings.als_gain].ch1; |
| |
| /* note: lux is 31 bit max at this point */ |
| if (ch1lux > ch0lux) { |
| dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n", |
| __func__); |
| ret = 0; |
| chip->als_cur_info.lux = 0; |
| goto done; |
| } |
| |
| lux = ch0lux - ch1lux; |
| } |
| |
| /* adjust for active time scale */ |
| if (chip->als_time_scale == 0) |
| lux = 0; |
| else |
| lux = (lux + (chip->als_time_scale >> 1)) / |
| chip->als_time_scale; |
| |
| /* |
| * Adjust for active gain scale. |
| * The tsl2583_default_lux tables above have a factor of 8192 built in, |
| * so we need to shift right. |
| * 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(). |
| */ |
| lux64 = lux; |
| lux64 = lux64 * chip->als_settings.als_gain_trim; |
| lux64 >>= 13; |
| lux = lux64; |
| lux = DIV_ROUND_CLOSEST(lux, 1000); |
| |
| if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */ |
| return_max: |
| lux = TSL2583_LUX_CALC_OVER_FLOW; |
| } |
| |
| /* Update the structure with the latest VALID lux. */ |
| chip->als_cur_info.lux = lux; |
| ret = lux; |
| |
| done: |
| return ret; |
| } |
| |
| /* |
| * Obtain single reading and calculate the als_gain_trim (later used |
| * to derive actual lux). |
| * Return updated gain_trim value. |
| */ |
| static int tsl2583_als_calibrate(struct iio_dev *indio_dev) |
| { |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| unsigned int gain_trim_val; |
| int ret; |
| int lux_val; |
| |
| ret = i2c_smbus_read_byte_data(chip->client, |
| TSL2583_CMD_REG | TSL2583_CNTRL); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, |
| "%s: failed to read from the CNTRL register\n", |
| __func__); |
| return ret; |
| } |
| |
| if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) |
| != (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) { |
| dev_err(&chip->client->dev, |
| "%s: Device is not powered on and/or ADC is not enabled\n", |
| __func__); |
| return -EINVAL; |
| } else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) { |
| dev_err(&chip->client->dev, |
| "%s: The two ADC channels have not completed an integration cycle\n", |
| __func__); |
| return -ENODATA; |
| } |
| |
| lux_val = tsl2583_get_lux(indio_dev); |
| if (lux_val < 0) { |
| dev_err(&chip->client->dev, "%s: failed to get lux\n", |
| __func__); |
| return lux_val; |
| } |
| |
| /* Avoid division by zero of lux_value later on */ |
| if (lux_val == 0) { |
| dev_err(&chip->client->dev, |
| "%s: lux_val of 0 will produce out of range trim_value\n", |
| __func__); |
| return -ENODATA; |
| } |
| |
| gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target) |
| * chip->als_settings.als_gain_trim) / lux_val); |
| if ((gain_trim_val < 250) || (gain_trim_val > 4000)) { |
| dev_err(&chip->client->dev, |
| "%s: trim_val of %d is not within the range [250, 4000]\n", |
| __func__, gain_trim_val); |
| return -ENODATA; |
| } |
| |
| chip->als_settings.als_gain_trim = (int)gain_trim_val; |
| |
| return 0; |
| } |
| |
| static int tsl2583_set_als_time(struct tsl2583_chip *chip) |
| { |
| int als_count, als_time, ret; |
| u8 val; |
| |
| /* determine als integration register */ |
| als_count = DIV_ROUND_CLOSEST(chip->als_settings.als_time * 100, 270); |
| if (!als_count) |
| als_count = 1; /* ensure at least one cycle */ |
| |
| /* convert back to time (encompasses overrides) */ |
| als_time = DIV_ROUND_CLOSEST(als_count * 27, 10); |
| |
| val = 256 - als_count; |
| ret = i2c_smbus_write_byte_data(chip->client, |
| TSL2583_CMD_REG | TSL2583_ALS_TIME, |
| val); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, "%s: failed to set the als time to %d\n", |
| __func__, val); |
| return ret; |
| } |
| |
| /* set chip struct re scaling and saturation */ |
| chip->als_saturation = als_count * 922; /* 90% of full scale */ |
| chip->als_time_scale = DIV_ROUND_CLOSEST(als_time, 50); |
| |
| return ret; |
| } |
| |
| static int tsl2583_set_als_gain(struct tsl2583_chip *chip) |
| { |
| int ret; |
| |
| /* Set the gain based on als_settings struct */ |
| ret = i2c_smbus_write_byte_data(chip->client, |
| TSL2583_CMD_REG | TSL2583_GAIN, |
| chip->als_settings.als_gain); |
| if (ret < 0) |
| dev_err(&chip->client->dev, |
| "%s: failed to set the gain to %d\n", __func__, |
| chip->als_settings.als_gain); |
| |
| return ret; |
| } |
| |
| static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state) |
| { |
| int ret; |
| |
| ret = i2c_smbus_write_byte_data(chip->client, |
| TSL2583_CMD_REG | TSL2583_CNTRL, state); |
| if (ret < 0) |
| dev_err(&chip->client->dev, |
| "%s: failed to set the power state to %d\n", __func__, |
| state); |
| |
| return ret; |
| } |
| |
| /* |
| * Turn the device on. |
| * Configuration must be set before calling this function. |
| */ |
| static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev) |
| { |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret; |
| |
| /* Power on the device; ADC off. */ |
| ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON); |
| if (ret < 0) |
| return ret; |
| |
| ret = i2c_smbus_write_byte_data(chip->client, |
| TSL2583_CMD_REG | TSL2583_INTERRUPT, |
| TSL2583_INTERRUPT_DISABLED); |
| if (ret < 0) { |
| dev_err(&chip->client->dev, |
| "%s: failed to disable interrupts\n", __func__); |
| return ret; |
| } |
| |
| ret = tsl2583_set_als_time(chip); |
| if (ret < 0) |
| return ret; |
| |
| ret = tsl2583_set_als_gain(chip); |
| if (ret < 0) |
| return ret; |
| |
| usleep_range(3000, 3500); |
| |
| ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON | |
| TSL2583_CNTL_ADC_ENBL); |
| if (ret < 0) |
| return ret; |
| |
| return ret; |
| } |
| |
| /* Sysfs Interface Functions */ |
| |
| static ssize_t in_illuminance_input_target_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&chip->als_mutex); |
| ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target); |
| mutex_unlock(&chip->als_mutex); |
| |
| return ret; |
| } |
| |
| static ssize_t in_illuminance_input_target_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int value; |
| |
| if (kstrtoint(buf, 0, &value) || !value) |
| return -EINVAL; |
| |
| mutex_lock(&chip->als_mutex); |
| chip->als_settings.als_cal_target = value; |
| mutex_unlock(&chip->als_mutex); |
| |
| return len; |
| } |
| |
| static ssize_t in_illuminance_calibrate_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int value, ret; |
| |
| if (kstrtoint(buf, 0, &value) || value != 1) |
| return -EINVAL; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| ret = tsl2583_als_calibrate(indio_dev); |
| if (ret < 0) |
| goto done; |
| |
| ret = len; |
| done: |
| mutex_unlock(&chip->als_mutex); |
| |
| return ret; |
| } |
| |
| static ssize_t in_illuminance_lux_table_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| unsigned int i; |
| int offset = 0; |
| |
| for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) { |
| offset += sprintf(buf + offset, "%u,%u,%u,", |
| chip->als_settings.als_device_lux[i].ratio, |
| chip->als_settings.als_device_lux[i].ch0, |
| chip->als_settings.als_device_lux[i].ch1); |
| if (chip->als_settings.als_device_lux[i].ratio == 0) { |
| /* |
| * We just printed the first "0" entry. |
| * Now get rid of the extra "," and break. |
| */ |
| offset--; |
| break; |
| } |
| } |
| |
| offset += sprintf(buf + offset, "\n"); |
| |
| return offset; |
| } |
| |
| static ssize_t in_illuminance_lux_table_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| const unsigned int max_ints = TSL2583_MAX_LUX_TABLE_ENTRIES * 3; |
| int value[TSL2583_MAX_LUX_TABLE_ENTRIES * 3 + 1]; |
| int ret = -EINVAL; |
| unsigned int n; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| get_options(buf, ARRAY_SIZE(value), value); |
| |
| /* |
| * 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. |
| */ |
| n = value[0]; |
| if ((n % 3) || n < 6 || n > max_ints) { |
| dev_err(dev, |
| "%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]\n", |
| __func__, max_ints); |
| goto done; |
| } |
| if ((value[n - 2] | value[n - 1] | value[n]) != 0) { |
| dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n", |
| __func__); |
| goto done; |
| } |
| |
| memcpy(chip->als_settings.als_device_lux, &value[1], |
| value[0] * sizeof(value[1])); |
| |
| ret = len; |
| |
| done: |
| mutex_unlock(&chip->als_mutex); |
| |
| return ret; |
| } |
| |
| static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111"); |
| static IIO_CONST_ATTR(in_illuminance_integration_time_available, |
| "0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.450 0.500 0.550 0.600 0.650"); |
| static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0); |
| static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0); |
| static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0); |
| |
| static struct attribute *sysfs_attrs_ctrl[] = { |
| &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr, |
| &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr, |
| &iio_dev_attr_in_illuminance_input_target.dev_attr.attr, |
| &iio_dev_attr_in_illuminance_calibrate.dev_attr.attr, |
| &iio_dev_attr_in_illuminance_lux_table.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group tsl2583_attribute_group = { |
| .attrs = sysfs_attrs_ctrl, |
| }; |
| |
| static const struct iio_chan_spec tsl2583_channels[] = { |
| { |
| .type = IIO_LIGHT, |
| .modified = 1, |
| .channel2 = IIO_MOD_LIGHT_IR, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
| }, |
| { |
| .type = IIO_LIGHT, |
| .modified = 1, |
| .channel2 = IIO_MOD_LIGHT_BOTH, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
| }, |
| { |
| .type = IIO_LIGHT, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| BIT(IIO_CHAN_INFO_CALIBBIAS) | |
| BIT(IIO_CHAN_INFO_CALIBSCALE) | |
| BIT(IIO_CHAN_INFO_INT_TIME), |
| }, |
| }; |
| |
| static int tsl2583_set_pm_runtime_busy(struct tsl2583_chip *chip, bool on) |
| { |
| int ret; |
| |
| if (on) { |
| ret = pm_runtime_resume_and_get(&chip->client->dev); |
| } else { |
| pm_runtime_mark_last_busy(&chip->client->dev); |
| ret = pm_runtime_put_autosuspend(&chip->client->dev); |
| } |
| |
| return ret; |
| } |
| |
| static int tsl2583_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret, pm_ret; |
| |
| ret = tsl2583_set_pm_runtime_busy(chip, true); |
| if (ret < 0) |
| return ret; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| ret = -EINVAL; |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| if (chan->type == IIO_LIGHT) { |
| ret = tsl2583_get_lux(indio_dev); |
| if (ret < 0) |
| goto read_done; |
| |
| /* |
| * From page 20 of the TSL2581, TSL2583 data |
| * sheet (TAOS134 − MARCH 2011): |
| * |
| * One of the photodiodes (channel 0) is |
| * sensitive to both visible and infrared light, |
| * while the second photodiode (channel 1) is |
| * sensitive primarily to infrared light. |
| */ |
| if (chan->channel2 == IIO_MOD_LIGHT_BOTH) |
| *val = chip->als_cur_info.als_ch0; |
| else |
| *val = chip->als_cur_info.als_ch1; |
| |
| ret = IIO_VAL_INT; |
| } |
| break; |
| case IIO_CHAN_INFO_PROCESSED: |
| if (chan->type == IIO_LIGHT) { |
| ret = tsl2583_get_lux(indio_dev); |
| if (ret < 0) |
| goto read_done; |
| |
| *val = ret; |
| ret = IIO_VAL_INT; |
| } |
| break; |
| case IIO_CHAN_INFO_CALIBBIAS: |
| if (chan->type == IIO_LIGHT) { |
| *val = chip->als_settings.als_gain_trim; |
| ret = IIO_VAL_INT; |
| } |
| break; |
| case IIO_CHAN_INFO_CALIBSCALE: |
| if (chan->type == IIO_LIGHT) { |
| *val = gainadj[chip->als_settings.als_gain].mean; |
| ret = IIO_VAL_INT; |
| } |
| break; |
| case IIO_CHAN_INFO_INT_TIME: |
| if (chan->type == IIO_LIGHT) { |
| *val = 0; |
| *val2 = chip->als_settings.als_time; |
| ret = IIO_VAL_INT_PLUS_MICRO; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| read_done: |
| mutex_unlock(&chip->als_mutex); |
| |
| if (ret < 0) { |
| tsl2583_set_pm_runtime_busy(chip, false); |
| return ret; |
| } |
| |
| /* |
| * Preserve the ret variable if the call to |
| * tsl2583_set_pm_runtime_busy() is successful so the reading |
| * (if applicable) is returned to user space. |
| */ |
| pm_ret = tsl2583_set_pm_runtime_busy(chip, false); |
| if (pm_ret < 0) |
| return pm_ret; |
| |
| return ret; |
| } |
| |
| static int tsl2583_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret; |
| |
| ret = tsl2583_set_pm_runtime_busy(chip, true); |
| if (ret < 0) |
| return ret; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| ret = -EINVAL; |
| switch (mask) { |
| case IIO_CHAN_INFO_CALIBBIAS: |
| if (chan->type == IIO_LIGHT) { |
| chip->als_settings.als_gain_trim = val; |
| ret = 0; |
| } |
| break; |
| case IIO_CHAN_INFO_CALIBSCALE: |
| if (chan->type == IIO_LIGHT) { |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(gainadj); i++) { |
| if (gainadj[i].mean == val) { |
| chip->als_settings.als_gain = i; |
| ret = tsl2583_set_als_gain(chip); |
| break; |
| } |
| } |
| } |
| break; |
| case IIO_CHAN_INFO_INT_TIME: |
| if (chan->type == IIO_LIGHT && !val && val2 >= 50 && |
| val2 <= 650 && !(val2 % 50)) { |
| chip->als_settings.als_time = val2; |
| ret = tsl2583_set_als_time(chip); |
| } |
| break; |
| default: |
| break; |
| } |
| |
| mutex_unlock(&chip->als_mutex); |
| |
| if (ret < 0) { |
| tsl2583_set_pm_runtime_busy(chip, false); |
| return ret; |
| } |
| |
| ret = tsl2583_set_pm_runtime_busy(chip, false); |
| if (ret < 0) |
| return ret; |
| |
| return ret; |
| } |
| |
| static const struct iio_info tsl2583_info = { |
| .attrs = &tsl2583_attribute_group, |
| .read_raw = tsl2583_read_raw, |
| .write_raw = tsl2583_write_raw, |
| }; |
| |
| static int tsl2583_probe(struct i2c_client *clientp) |
| { |
| int ret; |
| struct tsl2583_chip *chip; |
| struct iio_dev *indio_dev; |
| |
| if (!i2c_check_functionality(clientp->adapter, |
| I2C_FUNC_SMBUS_BYTE_DATA)) { |
| dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n", |
| __func__); |
| return -EOPNOTSUPP; |
| } |
| |
| indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| chip = iio_priv(indio_dev); |
| chip->client = clientp; |
| i2c_set_clientdata(clientp, indio_dev); |
| |
| mutex_init(&chip->als_mutex); |
| |
| ret = i2c_smbus_read_byte_data(clientp, |
| TSL2583_CMD_REG | TSL2583_CHIPID); |
| if (ret < 0) { |
| dev_err(&clientp->dev, |
| "%s: failed to read the chip ID register\n", __func__); |
| return ret; |
| } |
| |
| if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) { |
| dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n", |
| __func__, ret); |
| return -EINVAL; |
| } |
| |
| indio_dev->info = &tsl2583_info; |
| indio_dev->channels = tsl2583_channels; |
| indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels); |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->name = chip->client->name; |
| |
| pm_runtime_enable(&clientp->dev); |
| pm_runtime_set_autosuspend_delay(&clientp->dev, |
| TSL2583_POWER_OFF_DELAY_MS); |
| pm_runtime_use_autosuspend(&clientp->dev); |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) { |
| dev_err(&clientp->dev, "%s: iio registration failed\n", |
| __func__); |
| return ret; |
| } |
| |
| /* Load up the V2 defaults (these are hard coded defaults for now) */ |
| tsl2583_defaults(chip); |
| |
| dev_info(&clientp->dev, "Light sensor found.\n"); |
| |
| return 0; |
| } |
| |
| static void tsl2583_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| |
| pm_runtime_disable(&client->dev); |
| pm_runtime_set_suspended(&client->dev); |
| |
| tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF); |
| } |
| |
| static int tsl2583_suspend(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF); |
| |
| mutex_unlock(&chip->als_mutex); |
| |
| return ret; |
| } |
| |
| static int tsl2583_resume(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct tsl2583_chip *chip = iio_priv(indio_dev); |
| int ret; |
| |
| mutex_lock(&chip->als_mutex); |
| |
| ret = tsl2583_chip_init_and_power_on(indio_dev); |
| |
| mutex_unlock(&chip->als_mutex); |
| |
| return ret; |
| } |
| |
| static DEFINE_RUNTIME_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, |
| tsl2583_resume, NULL); |
| |
| static const struct i2c_device_id tsl2583_idtable[] = { |
| { "tsl2580", 0 }, |
| { "tsl2581", 1 }, |
| { "tsl2583", 2 }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, tsl2583_idtable); |
| |
| static const struct of_device_id tsl2583_of_match[] = { |
| { .compatible = "amstaos,tsl2580", }, |
| { .compatible = "amstaos,tsl2581", }, |
| { .compatible = "amstaos,tsl2583", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, tsl2583_of_match); |
| |
| /* Driver definition */ |
| static struct i2c_driver tsl2583_driver = { |
| .driver = { |
| .name = "tsl2583", |
| .pm = pm_ptr(&tsl2583_pm_ops), |
| .of_match_table = tsl2583_of_match, |
| }, |
| .id_table = tsl2583_idtable, |
| .probe_new = tsl2583_probe, |
| .remove = tsl2583_remove, |
| }; |
| module_i2c_driver(tsl2583_driver); |
| |
| MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>"); |
| MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>"); |
| MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver"); |
| MODULE_LICENSE("GPL"); |