--- /dev/null
+/*
+ * Device driver for monitoring ambient light intensity (lux)
+ * within the TAOS tsl258x family of devices (tsl2580, tsl2581).
+ *
+ * Copyright (c) 2011, TAOS Corporation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#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>
+
+#define TSL258X_MAX_DEVICE_REGS 32
+
+/* Triton register offsets */
+#define TSL258X_REG_MAX 8
+
+/* Device Registers and Masks */
+#define TSL258X_CNTRL 0x00
+#define TSL258X_ALS_TIME 0X01
+#define TSL258X_INTERRUPT 0x02
+#define TSL258X_GAIN 0x07
+#define TSL258X_REVID 0x11
+#define TSL258X_CHIPID 0x12
+#define TSL258X_ALS_CHAN0LO 0x14
+#define TSL258X_ALS_CHAN0HI 0x15
+#define TSL258X_ALS_CHAN1LO 0x16
+#define TSL258X_ALS_CHAN1HI 0x17
+#define TSL258X_TMR_LO 0x18
+#define TSL258X_TMR_HI 0x19
+
+/* tsl2583 cmd reg masks */
+#define TSL258X_CMD_REG 0x80
+#define TSL258X_CMD_SPL_FN 0x60
+#define TSL258X_CMD_ALS_INT_CLR 0X01
+
+/* tsl2583 cntrl reg masks */
+#define TSL258X_CNTL_ADC_ENBL 0x02
+#define TSL258X_CNTL_PWR_ON 0x01
+
+/* tsl2583 status reg masks */
+#define TSL258X_STA_ADC_VALID 0x01
+#define TSL258X_STA_ADC_INTR 0x10
+
+/* Lux calculation constants */
+#define TSL258X_LUX_CALC_OVER_FLOW 65535
+
+enum {
+ TSL258X_CHIP_UNKNOWN = 0,
+ TSL258X_CHIP_WORKING = 1,
+ TSL258X_CHIP_SUSPENDED = 2
+};
+
+/* Per-device data */
+struct taos_als_info {
+ u16 als_ch0;
+ u16 als_ch1;
+ u16 lux;
+};
+
+struct taos_settings {
+ int als_time;
+ int als_gain;
+ int als_gain_trim;
+ int als_cal_target;
+};
+
+struct tsl2583_chip {
+ struct mutex als_mutex;
+ struct i2c_client *client;
+ struct taos_als_info als_cur_info;
+ struct taos_settings taos_settings;
+ int als_time_scale;
+ int als_saturation;
+ int taos_chip_status;
+ u8 taos_config[8];
+};
+
+/*
+ * Initial values for device - this values can/will be changed by driver.
+ * and applications as needed.
+ * These values are dynamic.
+ */
+static const u8 taos_config[8] = {
+ 0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00
+}; /* cntrl atime intC Athl0 Athl1 Athh0 Athh1 gain */
+
+struct taos_lux {
+ unsigned int ratio;
+ unsigned int ch0;
+ unsigned int ch1;
+};
+
+/* This structure is intentionally large to accommodate updates via sysfs. */
+/* Sized to 11 = max 10 segments + 1 termination segment */
+/* Assumption is one and only one type of glass used */
+static struct taos_lux taos_device_lux[11] = {
+ { 9830, 8520, 15729 },
+ { 12452, 10807, 23344 },
+ { 14746, 6383, 11705 },
+ { 17695, 4063, 6554 },
+};
+
+struct gainadj {
+ s16 ch0;
+ s16 ch1;
+};
+
+/* Index = (0 - 3) Used to validate the gain selection index */
+static const struct gainadj gainadj[] = {
+ { 1, 1 },
+ { 8, 8 },
+ { 16, 16 },
+ { 107, 115 }
+};
+
+/*
+ * Provides initial operational parameter defaults.
+ * These defaults may be changed through the device's sysfs files.
+ */
+static void taos_defaults(struct tsl2583_chip *chip)
+{
+ /* Operational parameters */
+ chip->taos_settings.als_time = 100;
+ /* must be a multiple of 50mS */
+ chip->taos_settings.als_gain = 0;
+ /* this is actually an index into the gain table */
+ /* assume clear glass as default */
+ chip->taos_settings.als_gain_trim = 1000;
+ /* default gain trim to account for aperture effects */
+ chip->taos_settings.als_cal_target = 130;
+ /* Known external ALS reading used for calibration */
+}
+
+/*
+ * Read a number of bytes starting at register (reg) location.
+ * Return 0, or i2c_smbus_write_byte ERROR code.
+ */
+static int
+taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
+{
+ int i, ret;
+
+ for (i = 0; i < len; i++) {
+ /* select register to write */
+ ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | reg));
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "taos_i2c_read failed to write register %x\n",
+ reg);
+ return ret;
+ }
+ /* read the data */
+ *val = i2c_smbus_read_byte(client);
+ val++;
+ reg++;
+ }
+ return 0;
+}
+
+/*
+ * 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 taos_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 taos_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 taos_lux *p;
+ struct tsl2583_chip *chip = iio_priv(indio_dev);
+ int i, ret;
+ u32 ch0lux = 0;
+ u32 ch1lux = 0;
+
+ if (mutex_trylock(&chip->als_mutex) == 0) {
+ dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
+ return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
+ }
+
+ if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
+ /* device is not enabled */
+ dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
+ goto out_unlock;
+ }
+ /* is data new & valid */
+ if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
+ dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
+ ret = chip->als_cur_info.lux; /* return LAST VALUE */
+ goto out_unlock;
+ }
+
+ for (i = 0; i < 4; i++) {
+ int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
+
+ ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "taos_get_lux failed to read register %x\n",
+ reg);
+ goto out_unlock;
+ }
+ }
+
+ /* clear status, really interrupt status (interrupts are off), but
+ * we use the bit anyway - don't forget 0x80 - this is a command*/
+ ret = i2c_smbus_write_byte(chip->client,
+ (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
+ TSL258X_CMD_ALS_INT_CLR));
+
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
+ ret);
+ goto out_unlock; /* 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 == 0) {
+ /* have no data, so return LAST VALUE */
+ ret = chip->als_cur_info.lux = 0;
+ goto out_unlock;
+ }
+ /* calculate ratio */
+ ratio = (ch1 << 15) / ch0;
+ /* convert to unscaled lux using the pointer to the table */
+ for (p = (struct taos_lux *) taos_device_lux;
+ p->ratio != 0 && p->ratio < ratio; p++)
+ ;
+
+ if (p->ratio == 0) {
+ lux = 0;
+ } else {
+ ch0lux = ((ch0 * p->ch0) +
+ (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
+ / gainadj[chip->taos_settings.als_gain].ch0;
+ ch1lux = ((ch1 * p->ch1) +
+ (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
+ / gainadj[chip->taos_settings.als_gain].ch1;
+ lux = ch0lux - ch1lux;
+ }
+
+ /* note: lux is 31 bit max at this point */
+ if (ch1lux > ch0lux) {
+ dev_dbg(&chip->client->dev, "No Data - Return last value\n");
+ ret = chip->als_cur_info.lux = 0;
+ goto out_unlock;
+ }
+
+ /* 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 taos_device_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->taos_settings.als_gain_trim;
+ lux64 >>= 13;
+ lux = lux64;
+ lux = (lux + 500) / 1000;
+ if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
+return_max:
+ lux = TSL258X_LUX_CALC_OVER_FLOW;
+ }
+
+ /* Update the structure with the latest VALID lux. */
+ chip->als_cur_info.lux = lux;
+ ret = lux;
+
+out_unlock:
+ mutex_unlock(&chip->als_mutex);
+ return ret;
+}
+
+/*
+ * Obtain single reading and calculate the als_gain_trim (later used
+ * to derive actual lux).
+ * Return updated gain_trim value.
+ */
+static int taos_als_calibrate(struct iio_dev *indio_dev)
+{
+ struct tsl2583_chip *chip = iio_priv(indio_dev);
+ u8 reg_val;
+ unsigned int gain_trim_val;
+ int ret;
+ int lux_val;
+
+ ret = i2c_smbus_write_byte(chip->client,
+ (TSL258X_CMD_REG | TSL258X_CNTRL));
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
+ ret);
+ return ret;
+ }
+
+ reg_val = i2c_smbus_read_byte(chip->client);
+ if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
+ != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
+ dev_err(&chip->client->dev,
+ "taos_als_calibrate failed: device not powered on with ADC enabled\n");
+ return -1;
+ }
+
+ ret = i2c_smbus_write_byte(chip->client,
+ (TSL258X_CMD_REG | TSL258X_CNTRL));
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
+ ret);
+ return ret;
+ }
+ reg_val = i2c_smbus_read_byte(chip->client);
+
+ if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
+ dev_err(&chip->client->dev,
+ "taos_als_calibrate failed: STATUS - ADC not valid.\n");
+ return -ENODATA;
+ }
+ lux_val = taos_get_lux(indio_dev);
+ if (lux_val < 0) {
+ dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
+ return lux_val;
+ }
+ gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target)
+ * chip->taos_settings.als_gain_trim) / lux_val);
+
+ if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
+ dev_err(&chip->client->dev,
+ "taos_als_calibrate failed: trim_val of %d is out of range\n",
+ gain_trim_val);
+ return -ENODATA;
+ }
+ chip->taos_settings.als_gain_trim = (int) gain_trim_val;
+
+ return (int) gain_trim_val;
+}
+
+/*
+ * Turn the device on.
+ * Configuration must be set before calling this function.
+ */
+static int taos_chip_on(struct iio_dev *indio_dev)
+{
+ int i;
+ int ret;
+ u8 *uP;
+ u8 utmp;
+ int als_count;
+ int als_time;
+ struct tsl2583_chip *chip = iio_priv(indio_dev);
+
+ /* and make sure we're not already on */
+ if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
+ /* if forcing a register update - turn off, then on */
+ dev_info(&chip->client->dev, "device is already enabled\n");
+ return -EINVAL;
+ }
+
+ /* determine als integration register */
+ als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
+ if (als_count == 0)
+ als_count = 1; /* ensure at least one cycle */
+
+ /* convert back to time (encompasses overrides) */
+ als_time = (als_count * 27 + 5) / 10;
+ chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
+
+ /* Set the gain based on taos_settings struct */
+ chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
+
+ /* 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;
+
+ /* TSL258x Specific power-on / adc enable sequence
+ * Power on the device 1st. */
+ utmp = TSL258X_CNTL_PWR_ON;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
+ return ret;
+ }
+
+ /* Use the following shadow copy for our delay before enabling ADC.
+ * Write all the registers. */
+ for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL258X_CMD_REG + i,
+ *uP++);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "taos_chip_on failed on reg %d.\n", i);
+ return ret;
+ }
+ }
+
+ usleep_range(3000, 3500);
+ /* NOW enable the ADC
+ * initialize the desired mode of operation */
+ utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL258X_CMD_REG | TSL258X_CNTRL,
+ utmp);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
+ return ret;
+ }
+ chip->taos_chip_status = TSL258X_CHIP_WORKING;
+
+ return ret;
+}
+
+static int taos_chip_off(struct iio_dev *indio_dev)
+{
+ struct tsl2583_chip *chip = iio_priv(indio_dev);
+
+ /* turn device off */
+ chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
+ return i2c_smbus_write_byte_data(chip->client,
+ TSL258X_CMD_REG | TSL258X_CNTRL,
+ 0x00);
+}
+
+/* Sysfs Interface Functions */
+
+static ssize_t taos_power_state_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);
+
+ return sprintf(buf, "%d\n", chip->taos_chip_status);
+}
+
+static ssize_t taos_power_state_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ int value;
+
+ if (kstrtoint(buf, 0, &value))
+ return -EINVAL;
+
+ if (value == 0)
+ taos_chip_off(indio_dev);
+ else
+ taos_chip_on(indio_dev);
+
+ return len;
+}
+
+static ssize_t taos_gain_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);
+ char gain[4] = {0};
+
+ switch (chip->taos_settings.als_gain) {
+ case 0:
+ strcpy(gain, "001");
+ break;
+ case 1:
+ strcpy(gain, "008");
+ break;
+ case 2:
+ strcpy(gain, "016");
+ break;
+ case 3:
+ strcpy(gain, "111");
+ break;
+ }
+
+ return sprintf(buf, "%s\n", gain);
+}
+
+static ssize_t taos_gain_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))
+ return -EINVAL;
+
+ switch (value) {
+ case 1:
+ chip->taos_settings.als_gain = 0;
+ break;
+ case 8:
+ chip->taos_settings.als_gain = 1;
+ break;
+ case 16:
+ chip->taos_settings.als_gain = 2;
+ break;
+ case 111:
+ chip->taos_settings.als_gain = 3;
+ break;
+ default:
+ dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
+ return -1;
+ }
+
+ return len;
+}
+
+static ssize_t taos_gain_available_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n", "1 8 16 111");
+}
+
+static ssize_t taos_als_time_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);
+
+ return sprintf(buf, "%d\n", chip->taos_settings.als_time);
+}
+
+static ssize_t taos_als_time_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))
+ return -EINVAL;
+
+ if ((value < 50) || (value > 650))
+ return -EINVAL;
+
+ if (value % 50)
+ return -EINVAL;
+
+ chip->taos_settings.als_time = value;
+
+ return len;
+}
+
+static ssize_t taos_als_time_available_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n",
+ "50 100 150 200 250 300 350 400 450 500 550 600 650");
+}
+
+static ssize_t taos_als_trim_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);
+
+ return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
+}
+
+static ssize_t taos_als_trim_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))
+ return -EINVAL;
+
+ if (value)
+ chip->taos_settings.als_gain_trim = value;
+
+ return len;
+}
+
+static ssize_t taos_als_cal_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);
+
+ return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
+}
+
+static ssize_t taos_als_cal_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))
+ return -EINVAL;
+
+ if (value)
+ chip->taos_settings.als_cal_target = value;
+
+ return len;
+}
+
+static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+
+ ret = taos_get_lux(dev_to_iio_dev(dev));
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t taos_do_calibrate(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ int value;
+
+ if (kstrtoint(buf, 0, &value))
+ return -EINVAL;
+
+ if (value == 1)
+ taos_als_calibrate(indio_dev);
+
+ return len;
+}
+
+static ssize_t taos_luxtable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i;
+ int offset = 0;
+
+ for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
+ offset += sprintf(buf + offset, "%u,%u,%u,",
+ taos_device_lux[i].ratio,
+ taos_device_lux[i].ch0,
+ taos_device_lux[i].ch1);
+ if (taos_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 taos_luxtable_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[ARRAY_SIZE(taos_device_lux)*3 + 1];
+ int n;
+
+ 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 > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
+ dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
+ return -EINVAL;
+ }
+ if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
+ dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
+ return -EINVAL;
+ }
+
+ if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
+ taos_chip_off(indio_dev);
+
+ /* Zero out the table */
+ memset(taos_device_lux, 0, sizeof(taos_device_lux));
+ memcpy(taos_device_lux, &value[1], (value[0] * 4));
+
+ taos_chip_on(indio_dev);
+
+ return len;
+}
+
+static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
+ taos_power_state_show, taos_power_state_store);
+
+static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
+ taos_gain_show, taos_gain_store);
+static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
+ taos_gain_available_show, NULL);
+
+static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
+ taos_als_time_show, taos_als_time_store);
+static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
+ taos_als_time_available_show, NULL);
+
+static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
+ taos_als_trim_show, taos_als_trim_store);
+
+static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
+ taos_als_cal_target_show, taos_als_cal_target_store);
+
+static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
+static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
+static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
+ taos_luxtable_show, taos_luxtable_store);
+
+static struct attribute *sysfs_attrs_ctrl[] = {
+ &dev_attr_power_state.attr,
+ &dev_attr_illuminance0_calibscale.attr, /* Gain */
+ &dev_attr_illuminance0_calibscale_available.attr,
+ &dev_attr_illuminance0_integration_time.attr, /* I time*/
+ &dev_attr_illuminance0_integration_time_available.attr,
+ &dev_attr_illuminance0_calibbias.attr, /* trim */
+ &dev_attr_illuminance0_input_target.attr,
+ &dev_attr_illuminance0_input.attr,
+ &dev_attr_illuminance0_calibrate.attr,
+ &dev_attr_illuminance0_lux_table.attr,
+ NULL
+};
+
+static struct attribute_group tsl2583_attribute_group = {
+ .attrs = sysfs_attrs_ctrl,
+};
+
+/* Use the default register values to identify the Taos device */
+static int taos_tsl258x_device(unsigned char *bufp)
+{
+ return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
+}
+
+static const struct iio_info tsl2583_info = {
+ .attrs = &tsl2583_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+/*
+ * Client probe function - When a valid device is found, the driver's device
+ * data structure is updated, and initialization completes successfully.
+ */
+static int taos_probe(struct i2c_client *clientp,
+ const struct i2c_device_id *idp)
+{
+ int i, ret;
+ unsigned char buf[TSL258X_MAX_DEVICE_REGS];
+ struct tsl2583_chip *chip;
+ struct iio_dev *indio_dev;
+
+ if (!i2c_check_functionality(clientp->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&clientp->dev, "taos_probe() - i2c smbus byte data func unsupported\n");
+ 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->taos_chip_status = TSL258X_CHIP_UNKNOWN;
+ memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
+
+ for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
+ ret = i2c_smbus_write_byte(clientp,
+ (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
+ if (ret < 0) {
+ dev_err(&clientp->dev,
+ "i2c_smbus_write_byte to cmd reg failed in taos_probe(), err = %d\n",
+ ret);
+ return ret;
+ }
+ ret = i2c_smbus_read_byte(clientp);
+ if (ret < 0) {
+ dev_err(&clientp->dev,
+ "i2c_smbus_read_byte from reg failed in taos_probe(), err = %d\n",
+ ret);
+ return ret;
+ }
+ buf[i] = ret;
+ }
+
+ if (!taos_tsl258x_device(buf)) {
+ dev_info(&clientp->dev,
+ "i2c device found but does not match expected id in taos_probe()\n");
+ return -EINVAL;
+ }
+
+ ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
+ if (ret < 0) {
+ dev_err(&clientp->dev,
+ "i2c_smbus_write_byte() to cmd reg failed in taos_probe(), err = %d\n",
+ ret);
+ return ret;
+ }
+
+ indio_dev->info = &tsl2583_info;
+ indio_dev->dev.parent = &clientp->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->name = chip->client->name;
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&clientp->dev, "iio registration failed\n");
+ return ret;
+ }
+
+ /* Load up the V2 defaults (these are hard coded defaults for now) */
+ taos_defaults(chip);
+
+ /* Make sure the chip is on */
+ taos_chip_on(indio_dev);
+
+ dev_info(&clientp->dev, "Light sensor found.\n");
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int taos_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 = 0;
+
+ mutex_lock(&chip->als_mutex);
+
+ if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
+ ret = taos_chip_off(indio_dev);
+ chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
+ }
+
+ mutex_unlock(&chip->als_mutex);
+ return ret;
+}
+
+static int taos_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 = 0;
+
+ mutex_lock(&chip->als_mutex);
+
+ if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
+ ret = taos_chip_on(indio_dev);
+
+ mutex_unlock(&chip->als_mutex);
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
+#define TAOS_PM_OPS (&taos_pm_ops)
+#else
+#define TAOS_PM_OPS NULL
+#endif
+
+static int taos_remove(struct i2c_client *client)
+{
+ iio_device_unregister(i2c_get_clientdata(client));
+
+ return 0;
+}
+
+static struct i2c_device_id taos_idtable[] = {
+ { "tsl2580", 0 },
+ { "tsl2581", 1 },
+ { "tsl2583", 2 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, taos_idtable);
+
+/* Driver definition */
+static struct i2c_driver taos_driver = {
+ .driver = {
+ .name = "tsl2583",
+ .pm = TAOS_PM_OPS,
+ },
+ .id_table = taos_idtable,
+ .probe = taos_probe,
+ .remove = taos_remove,
+};
+module_i2c_driver(taos_driver);
+
+MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
+MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff