diff options
Diffstat (limited to 'drivers/iio/light/tsl2583.c')
| -rw-r--r-- | drivers/iio/light/tsl2583.c | 913 |
1 files changed, 913 insertions, 0 deletions
diff --git a/drivers/iio/light/tsl2583.c b/drivers/iio/light/tsl2583.c new file mode 100644 index 000000000000..a78b6025c465 --- /dev/null +++ b/drivers/iio/light/tsl2583.c @@ -0,0 +1,913 @@ +/* + * 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 Brian Masney <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#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> + +/* 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 + +/* 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; + bool suspended; +}; + +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 = (lux + 500) / 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; + } + + 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 = (chip->als_settings.als_time * 100 + 135) / 270; + if (!als_count) + als_count = 1; /* ensure at least one cycle */ + + /* convert back to time (encompasses overrides) */ + als_time = (als_count * 27 + 5) / 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 = (als_time + 25) / 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; + + chip->suspended = false; + + 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); + + if (chip->suspended) { + ret = -EBUSY; + goto done; + } + + 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, + "0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650"); +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_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 = -EINVAL; + + mutex_lock(&chip->als_mutex); + + if (chip->suspended) { + ret = -EBUSY; + goto read_done; + } + + 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); + + 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 = -EINVAL; + + mutex_lock(&chip->als_mutex); + + if (chip->suspended) { + ret = -EBUSY; + goto write_done; + } + + 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; + } + +write_done: + mutex_unlock(&chip->als_mutex); + + return ret; +} + +static const struct iio_info tsl2583_info = { + .attrs = &tsl2583_attribute_group, + .driver_module = THIS_MODULE, + .read_raw = tsl2583_read_raw, + .write_raw = tsl2583_write_raw, +}; + +static int tsl2583_probe(struct i2c_client *clientp, + const struct i2c_device_id *idp) +{ + 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); + chip->suspended = true; + + 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->dev.parent = &clientp->dev; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->name = chip->client->name; + + ret = devm_iio_device_register(indio_dev->dev.parent, 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); + + /* Make sure the chip is on */ + ret = tsl2583_chip_init_and_power_on(indio_dev); + if (ret < 0) + return ret; + + dev_info(&clientp->dev, "Light sensor found.\n"); + + return 0; +} + +static int __maybe_unused 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); + chip->suspended = true; + + mutex_unlock(&chip->als_mutex); + + return ret; +} + +static int __maybe_unused 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 SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume); + +static 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 = &tsl2583_pm_ops, + .of_match_table = tsl2583_of_match, + }, + .id_table = tsl2583_idtable, + .probe = tsl2583_probe, +}; +module_i2c_driver(tsl2583_driver); + +MODULE_AUTHOR("J. August Brenner <[email protected]>"); +MODULE_AUTHOR("Brian Masney <[email protected]>"); +MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver"); +MODULE_LICENSE("GPL"); |