--- /dev/null
+/*
+ * drivers/iio/light/tsl2563.c
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
+ * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
+ *
+ * Converted to IIO driver
+ * Amit Kucheria <amit.kucheria@verdurent.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/platform_data/tsl2563.h>
+
+/* Use this many bits for fraction part. */
+#define ADC_FRAC_BITS 14
+
+/* Given number of 1/10000's in ADC_FRAC_BITS precision. */
+#define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
+
+/* Bits used for fraction in calibration coefficients.*/
+#define CALIB_FRAC_BITS 10
+/* 0.5 in CALIB_FRAC_BITS precision */
+#define CALIB_FRAC_HALF (1 << (CALIB_FRAC_BITS - 1))
+/* Make a fraction from a number n that was multiplied with b. */
+#define CALIB_FRAC(n, b) (((n) << CALIB_FRAC_BITS) / (b))
+/* Decimal 10^(digits in sysfs presentation) */
+#define CALIB_BASE_SYSFS 1000
+
+#define TSL2563_CMD 0x80
+#define TSL2563_CLEARINT 0x40
+
+#define TSL2563_REG_CTRL 0x00
+#define TSL2563_REG_TIMING 0x01
+#define TSL2563_REG_LOWLOW 0x02 /* data0 low threshold, 2 bytes */
+#define TSL2563_REG_LOWHIGH 0x03
+#define TSL2563_REG_HIGHLOW 0x04 /* data0 high threshold, 2 bytes */
+#define TSL2563_REG_HIGHHIGH 0x05
+#define TSL2563_REG_INT 0x06
+#define TSL2563_REG_ID 0x0a
+#define TSL2563_REG_DATA0LOW 0x0c /* broadband sensor value, 2 bytes */
+#define TSL2563_REG_DATA0HIGH 0x0d
+#define TSL2563_REG_DATA1LOW 0x0e /* infrared sensor value, 2 bytes */
+#define TSL2563_REG_DATA1HIGH 0x0f
+
+#define TSL2563_CMD_POWER_ON 0x03
+#define TSL2563_CMD_POWER_OFF 0x00
+#define TSL2563_CTRL_POWER_MASK 0x03
+
+#define TSL2563_TIMING_13MS 0x00
+#define TSL2563_TIMING_100MS 0x01
+#define TSL2563_TIMING_400MS 0x02
+#define TSL2563_TIMING_MASK 0x03
+#define TSL2563_TIMING_GAIN16 0x10
+#define TSL2563_TIMING_GAIN1 0x00
+
+#define TSL2563_INT_DISBLED 0x00
+#define TSL2563_INT_LEVEL 0x10
+#define TSL2563_INT_PERSIST(n) ((n) & 0x0F)
+
+struct tsl2563_gainlevel_coeff {
+ u8 gaintime;
+ u16 min;
+ u16 max;
+};
+
+static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
+ {
+ .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
+ .min = 0,
+ .max = 65534,
+ }, {
+ .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
+ .min = 2048,
+ .max = 65534,
+ }, {
+ .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
+ .min = 4095,
+ .max = 37177,
+ }, {
+ .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
+ .min = 3000,
+ .max = 65535,
+ },
+};
+
+struct tsl2563_chip {
+ struct mutex lock;
+ struct i2c_client *client;
+ struct delayed_work poweroff_work;
+
+ /* Remember state for suspend and resume functions */
+ bool suspended;
+
+ struct tsl2563_gainlevel_coeff const *gainlevel;
+
+ u16 low_thres;
+ u16 high_thres;
+ u8 intr;
+ bool int_enabled;
+
+ /* Calibration coefficients */
+ u32 calib0;
+ u32 calib1;
+ int cover_comp_gain;
+
+ /* Cache current values, to be returned while suspended */
+ u32 data0;
+ u32 data1;
+};
+
+static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
+{
+ struct i2c_client *client = chip->client;
+ u8 cmd;
+
+ cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
+ return i2c_smbus_write_byte_data(client,
+ TSL2563_CMD | TSL2563_REG_CTRL, cmd);
+}
+
+/*
+ * Return value is 0 for off, 1 for on, or a negative error
+ * code if reading failed.
+ */
+static int tsl2563_get_power(struct tsl2563_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
+ if (ret < 0)
+ return ret;
+
+ return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
+}
+
+static int tsl2563_configure(struct tsl2563_chip *chip)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_TIMING,
+ chip->gainlevel->gaintime);
+ if (ret)
+ goto error_ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_HIGHLOW,
+ chip->high_thres & 0xFF);
+ if (ret)
+ goto error_ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_HIGHHIGH,
+ (chip->high_thres >> 8) & 0xFF);
+ if (ret)
+ goto error_ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_LOWLOW,
+ chip->low_thres & 0xFF);
+ if (ret)
+ goto error_ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_LOWHIGH,
+ (chip->low_thres >> 8) & 0xFF);
+/*
+ * Interrupt register is automatically written anyway if it is relevant
+ * so is not here.
+ */
+error_ret:
+ return ret;
+}
+
+static void tsl2563_poweroff_work(struct work_struct *work)
+{
+ struct tsl2563_chip *chip =
+ container_of(work, struct tsl2563_chip, poweroff_work.work);
+ tsl2563_set_power(chip, 0);
+}
+
+static int tsl2563_detect(struct tsl2563_chip *chip)
+{
+ int ret;
+
+ ret = tsl2563_set_power(chip, 1);
+ if (ret)
+ return ret;
+
+ ret = tsl2563_get_power(chip);
+ if (ret < 0)
+ return ret;
+
+ return ret ? 0 : -ENODEV;
+}
+
+static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
+{
+ struct i2c_client *client = chip->client;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
+ if (ret < 0)
+ return ret;
+
+ *id = ret;
+
+ return 0;
+}
+
+/*
+ * "Normalized" ADC value is one obtained with 400ms of integration time and
+ * 16x gain. This function returns the number of bits of shift needed to
+ * convert between normalized values and HW values obtained using given
+ * timing and gain settings.
+ */
+static int adc_shiftbits(u8 timing)
+{
+ int shift = 0;
+
+ switch (timing & TSL2563_TIMING_MASK) {
+ case TSL2563_TIMING_13MS:
+ shift += 5;
+ break;
+ case TSL2563_TIMING_100MS:
+ shift += 2;
+ break;
+ case TSL2563_TIMING_400MS:
+ /* no-op */
+ break;
+ }
+
+ if (!(timing & TSL2563_TIMING_GAIN16))
+ shift += 4;
+
+ return shift;
+}
+
+/* Convert a HW ADC value to normalized scale. */
+static u32 normalize_adc(u16 adc, u8 timing)
+{
+ return adc << adc_shiftbits(timing);
+}
+
+static void tsl2563_wait_adc(struct tsl2563_chip *chip)
+{
+ unsigned int delay;
+
+ switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
+ case TSL2563_TIMING_13MS:
+ delay = 14;
+ break;
+ case TSL2563_TIMING_100MS:
+ delay = 101;
+ break;
+ default:
+ delay = 402;
+ }
+ /*
+ * TODO: Make sure that we wait at least required delay but why we
+ * have to extend it one tick more?
+ */
+ schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
+}
+
+static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
+{
+ struct i2c_client *client = chip->client;
+
+ if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
+
+ (adc > chip->gainlevel->max) ?
+ chip->gainlevel++ : chip->gainlevel--;
+
+ i2c_smbus_write_byte_data(client,
+ TSL2563_CMD | TSL2563_REG_TIMING,
+ chip->gainlevel->gaintime);
+
+ tsl2563_wait_adc(chip);
+ tsl2563_wait_adc(chip);
+
+ return 1;
+ } else
+ return 0;
+}
+
+static int tsl2563_get_adc(struct tsl2563_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ u16 adc0, adc1;
+ int retry = 1;
+ int ret = 0;
+
+ if (chip->suspended)
+ goto out;
+
+ if (!chip->int_enabled) {
+ cancel_delayed_work(&chip->poweroff_work);
+
+ if (!tsl2563_get_power(chip)) {
+ ret = tsl2563_set_power(chip, 1);
+ if (ret)
+ goto out;
+ ret = tsl2563_configure(chip);
+ if (ret)
+ goto out;
+ tsl2563_wait_adc(chip);
+ }
+ }
+
+ while (retry) {
+ ret = i2c_smbus_read_word_data(client,
+ TSL2563_CMD | TSL2563_REG_DATA0LOW);
+ if (ret < 0)
+ goto out;
+ adc0 = ret;
+
+ ret = i2c_smbus_read_word_data(client,
+ TSL2563_CMD | TSL2563_REG_DATA1LOW);
+ if (ret < 0)
+ goto out;
+ adc1 = ret;
+
+ retry = tsl2563_adjust_gainlevel(chip, adc0);
+ }
+
+ chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
+ chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
+
+ if (!chip->int_enabled)
+ schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+static inline int calib_to_sysfs(u32 calib)
+{
+ return (int) (((calib * CALIB_BASE_SYSFS) +
+ CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
+}
+
+static inline u32 calib_from_sysfs(int value)
+{
+ return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
+}
+
+/*
+ * Conversions between lux and ADC values.
+ *
+ * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
+ * appropriate constants. Different constants are needed for different
+ * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
+ * of the intensities in infrared and visible wavelengths). lux_table below
+ * lists the upper threshold of the adc1/adc0 ratio and the corresponding
+ * constants.
+ */
+
+struct tsl2563_lux_coeff {
+ unsigned long ch_ratio;
+ unsigned long ch0_coeff;
+ unsigned long ch1_coeff;
+};
+
+static const struct tsl2563_lux_coeff lux_table[] = {
+ {
+ .ch_ratio = FRAC10K(1300),
+ .ch0_coeff = FRAC10K(315),
+ .ch1_coeff = FRAC10K(262),
+ }, {
+ .ch_ratio = FRAC10K(2600),
+ .ch0_coeff = FRAC10K(337),
+ .ch1_coeff = FRAC10K(430),
+ }, {
+ .ch_ratio = FRAC10K(3900),
+ .ch0_coeff = FRAC10K(363),
+ .ch1_coeff = FRAC10K(529),
+ }, {
+ .ch_ratio = FRAC10K(5200),
+ .ch0_coeff = FRAC10K(392),
+ .ch1_coeff = FRAC10K(605),
+ }, {
+ .ch_ratio = FRAC10K(6500),
+ .ch0_coeff = FRAC10K(229),
+ .ch1_coeff = FRAC10K(291),
+ }, {
+ .ch_ratio = FRAC10K(8000),
+ .ch0_coeff = FRAC10K(157),
+ .ch1_coeff = FRAC10K(180),
+ }, {
+ .ch_ratio = FRAC10K(13000),
+ .ch0_coeff = FRAC10K(34),
+ .ch1_coeff = FRAC10K(26),
+ }, {
+ .ch_ratio = ULONG_MAX,
+ .ch0_coeff = 0,
+ .ch1_coeff = 0,
+ },
+};
+
+/* Convert normalized, scaled ADC values to lux. */
+static unsigned int adc_to_lux(u32 adc0, u32 adc1)
+{
+ const struct tsl2563_lux_coeff *lp = lux_table;
+ unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
+
+ ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
+
+ while (lp->ch_ratio < ratio)
+ lp++;
+
+ lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
+
+ return (unsigned int) (lux >> ADC_FRAC_BITS);
+}
+
+/* Apply calibration coefficient to ADC count. */
+static u32 calib_adc(u32 adc, u32 calib)
+{
+ unsigned long scaled = adc;
+
+ scaled *= calib;
+ scaled >>= CALIB_FRAC_BITS;
+
+ return (u32) scaled;
+}
+
+static int tsl2563_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_CALIBSCALE)
+ return -EINVAL;
+ if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
+ chip->calib0 = calib_from_sysfs(val);
+ else if (chan->channel2 == IIO_MOD_LIGHT_IR)
+ chip->calib1 = calib_from_sysfs(val);
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int tsl2563_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ int ret = -EINVAL;
+ u32 calib0, calib1;
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+
+ mutex_lock(&chip->lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_LIGHT:
+ ret = tsl2563_get_adc(chip);
+ if (ret)
+ goto error_ret;
+ calib0 = calib_adc(chip->data0, chip->calib0) *
+ chip->cover_comp_gain;
+ calib1 = calib_adc(chip->data1, chip->calib1) *
+ chip->cover_comp_gain;
+ *val = adc_to_lux(calib0, calib1);
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_INTENSITY:
+ ret = tsl2563_get_adc(chip);
+ if (ret)
+ goto error_ret;
+ if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
+ *val = chip->data0;
+ else
+ *val = chip->data1;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+
+ case IIO_CHAN_INFO_CALIBSCALE:
+ if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
+ *val = calib_to_sysfs(chip->calib0);
+ else
+ *val = calib_to_sysfs(chip->calib1);
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret;
+ }
+
+error_ret:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static const struct iio_event_spec tsl2563_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+static const struct iio_chan_spec tsl2563_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .indexed = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .channel = 0,
+ }, {
+ .type = IIO_INTENSITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_LIGHT_BOTH,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE),
+ .event_spec = tsl2563_events,
+ .num_event_specs = ARRAY_SIZE(tsl2563_events),
+ }, {
+ .type = IIO_INTENSITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_LIGHT_IR,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE),
+ }
+};
+
+static int tsl2563_read_thresh(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, enum iio_event_info info, int *val,
+ int *val2)
+{
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ *val = chip->high_thres;
+ break;
+ case IIO_EV_DIR_FALLING:
+ *val = chip->low_thres;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return IIO_VAL_INT;
+}
+
+static int tsl2563_write_thresh(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, enum iio_event_info info, int val,
+ int val2)
+{
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+ int ret;
+ u8 address;
+
+ if (dir == IIO_EV_DIR_RISING)
+ address = TSL2563_REG_HIGHLOW;
+ else
+ address = TSL2563_REG_LOWLOW;
+ mutex_lock(&chip->lock);
+ ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
+ val & 0xFF);
+ if (ret)
+ goto error_ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | (address + 1),
+ (val >> 8) & 0xFF);
+ if (dir == IIO_EV_DIR_RISING)
+ chip->high_thres = val;
+ else
+ chip->low_thres = val;
+
+error_ret:
+ mutex_unlock(&chip->lock);
+
+ return ret;
+}
+
+static irqreturn_t tsl2563_event_handler(int irq, void *private)
+{
+ struct iio_dev *dev_info = private;
+ struct tsl2563_chip *chip = iio_priv(dev_info);
+
+ iio_push_event(dev_info,
+ IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns());
+
+ /* clear the interrupt and push the event */
+ i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
+ return IRQ_HANDLED;
+}
+
+static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+ int ret = 0;
+
+ mutex_lock(&chip->lock);
+ if (state && !(chip->intr & 0x30)) {
+ chip->intr &= ~0x30;
+ chip->intr |= 0x10;
+ /* ensure the chip is actually on */
+ cancel_delayed_work(&chip->poweroff_work);
+ if (!tsl2563_get_power(chip)) {
+ ret = tsl2563_set_power(chip, 1);
+ if (ret)
+ goto out;
+ ret = tsl2563_configure(chip);
+ if (ret)
+ goto out;
+ }
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_INT,
+ chip->intr);
+ chip->int_enabled = true;
+ }
+
+ if (!state && (chip->intr & 0x30)) {
+ chip->intr &= ~0x30;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_INT,
+ chip->intr);
+ chip->int_enabled = false;
+ /* now the interrupt is not enabled, we can go to sleep */
+ schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
+ }
+out:
+ mutex_unlock(&chip->lock);
+
+ return ret;
+}
+
+static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct tsl2563_chip *chip = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&chip->lock);
+ ret = i2c_smbus_read_byte_data(chip->client,
+ TSL2563_CMD | TSL2563_REG_INT);
+ mutex_unlock(&chip->lock);
+ if (ret < 0)
+ return ret;
+
+ return !!(ret & 0x30);
+}
+
+static const struct iio_info tsl2563_info_no_irq = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &tsl2563_read_raw,
+ .write_raw = &tsl2563_write_raw,
+};
+
+static const struct iio_info tsl2563_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &tsl2563_read_raw,
+ .write_raw = &tsl2563_write_raw,
+ .read_event_value = &tsl2563_read_thresh,
+ .write_event_value = &tsl2563_write_thresh,
+ .read_event_config = &tsl2563_read_interrupt_config,
+ .write_event_config = &tsl2563_write_interrupt_config,
+};
+
+static int tsl2563_probe(struct i2c_client *client,
+ const struct i2c_device_id *device_id)
+{
+ struct iio_dev *indio_dev;
+ struct tsl2563_chip *chip;
+ struct tsl2563_platform_data *pdata = client->dev.platform_data;
+ struct device_node *np = client->dev.of_node;
+ int err = 0;
+ u8 id = 0;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ chip = iio_priv(indio_dev);
+
+ i2c_set_clientdata(client, chip);
+ chip->client = client;
+
+ err = tsl2563_detect(chip);
+ if (err) {
+ dev_err(&client->dev, "detect error %d\n", -err);
+ return err;
+ }
+
+ err = tsl2563_read_id(chip, &id);
+ if (err) {
+ dev_err(&client->dev, "read id error %d\n", -err);
+ return err;
+ }
+
+ mutex_init(&chip->lock);
+
+ /* Default values used until userspace says otherwise */
+ chip->low_thres = 0x0;
+ chip->high_thres = 0xffff;
+ chip->gainlevel = tsl2563_gainlevel_table;
+ chip->intr = TSL2563_INT_PERSIST(4);
+ chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
+ chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
+
+ if (pdata)
+ chip->cover_comp_gain = pdata->cover_comp_gain;
+ else if (np)
+ of_property_read_u32(np, "amstaos,cover-comp-gain",
+ &chip->cover_comp_gain);
+ else
+ chip->cover_comp_gain = 1;
+
+ dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
+ indio_dev->name = client->name;
+ indio_dev->channels = tsl2563_channels;
+ indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (client->irq)
+ indio_dev->info = &tsl2563_info;
+ else
+ indio_dev->info = &tsl2563_info_no_irq;
+
+ if (client->irq) {
+ err = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL,
+ &tsl2563_event_handler,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "tsl2563_event",
+ indio_dev);
+ if (err) {
+ dev_err(&client->dev, "irq request error %d\n", -err);
+ return err;
+ }
+ }
+
+ err = tsl2563_configure(chip);
+ if (err) {
+ dev_err(&client->dev, "configure error %d\n", -err);
+ return err;
+ }
+
+ INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
+
+ /* The interrupt cannot yet be enabled so this is fine without lock */
+ schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
+
+ err = iio_device_register(indio_dev);
+ if (err) {
+ dev_err(&client->dev, "iio registration error %d\n", -err);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ cancel_delayed_work(&chip->poweroff_work);
+ flush_scheduled_work();
+ return err;
+}
+
+static int tsl2563_remove(struct i2c_client *client)
+{
+ struct tsl2563_chip *chip = i2c_get_clientdata(client);
+ struct iio_dev *indio_dev = iio_priv_to_dev(chip);
+
+ iio_device_unregister(indio_dev);
+ if (!chip->int_enabled)
+ cancel_delayed_work(&chip->poweroff_work);
+ /* Ensure that interrupts are disabled - then flush any bottom halves */
+ chip->intr &= ~0x30;
+ i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
+ chip->intr);
+ flush_scheduled_work();
+ tsl2563_set_power(chip, 0);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tsl2563_suspend(struct device *dev)
+{
+ struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
+ int ret;
+
+ mutex_lock(&chip->lock);
+
+ ret = tsl2563_set_power(chip, 0);
+ if (ret)
+ goto out;
+
+ chip->suspended = true;
+
+out:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static int tsl2563_resume(struct device *dev)
+{
+ struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
+ int ret;
+
+ mutex_lock(&chip->lock);
+
+ ret = tsl2563_set_power(chip, 1);
+ if (ret)
+ goto out;
+
+ ret = tsl2563_configure(chip);
+ if (ret)
+ goto out;
+
+ chip->suspended = false;
+
+out:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
+#define TSL2563_PM_OPS (&tsl2563_pm_ops)
+#else
+#define TSL2563_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id tsl2563_id[] = {
+ { "tsl2560", 0 },
+ { "tsl2561", 1 },
+ { "tsl2562", 2 },
+ { "tsl2563", 3 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, tsl2563_id);
+
+static struct i2c_driver tsl2563_i2c_driver = {
+ .driver = {
+ .name = "tsl2563",
+ .pm = TSL2563_PM_OPS,
+ },
+ .probe = tsl2563_probe,
+ .remove = tsl2563_remove,
+ .id_table = tsl2563_id,
+};
+module_i2c_driver(tsl2563_i2c_driver);
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_DESCRIPTION("tsl2563 light sensor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff