diff options
Diffstat (limited to 'drivers/iio/light/tsl2563.c')
| -rw-r--r-- | drivers/iio/light/tsl2563.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/drivers/iio/light/tsl2563.c b/drivers/iio/light/tsl2563.c new file mode 100644 index 000000000000..fd8be69b7d05 --- /dev/null +++ b/drivers/iio/light/tsl2563.c @@ -0,0 +1,887 @@ +/* + * 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 (chan->channel == IIO_MOD_LIGHT_BOTH) + chip->calib0 = calib_from_sysfs(val); + else + chip->calib1 = calib_from_sysfs(val); + + return 0; +} + +static int tsl2563_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + int ret = -EINVAL; + u32 calib0, calib1; + struct tsl2563_chip *chip = iio_priv(indio_dev); + + mutex_lock(&chip->lock); + switch (m) { + 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->channel == 0) + *val = chip->data0; + else + *val = chip->data1; + ret = IIO_VAL_INT; + break; + default: + break; + } + break; + + case IIO_CHAN_INFO_CALIBSCALE: + if (chan->channel == 0) + *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_chan_spec tsl2563_channels[] = { + { + .type = IIO_LIGHT, + .indexed = 1, + .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT, + .channel = 0, + }, { + .type = IIO_INTENSITY, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_BOTH, + .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | + IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT, + .event_mask = (IIO_EV_BIT(IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING) | + IIO_EV_BIT(IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING)), + }, { + .type = IIO_INTENSITY, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_IR, + .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | + IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT, + } +}; + +static int tsl2563_read_thresh(struct iio_dev *indio_dev, + u64 event_code, + int *val) +{ + struct tsl2563_chip *chip = iio_priv(indio_dev); + + switch (IIO_EVENT_CODE_EXTRACT_DIR(event_code)) { + case IIO_EV_DIR_RISING: + *val = chip->high_thres; + break; + case IIO_EV_DIR_FALLING: + *val = chip->low_thres; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int tsl2563_write_thresh(struct iio_dev *indio_dev, + u64 event_code, + int val) +{ + struct tsl2563_chip *chip = iio_priv(indio_dev); + int ret; + u8 address; + + if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == 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 (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == 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, + u64 event_code, + 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, + u64 event_code) +{ + 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; + int err = 0; + u8 id = 0; + + indio_dev = iio_device_alloc(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); + goto fail1; + } + + err = tsl2563_read_id(chip, &id); + if (err) { + dev_err(&client->dev, "read id error %d\n", -err); + goto fail1; + } + + 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 + 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 = request_threaded_irq(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); + goto fail1; + } + } + + err = tsl2563_configure(chip); + if (err) { + dev_err(&client->dev, "configure error %d\n", -err); + goto fail2; + } + + 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 fail3; + } + + return 0; + +fail3: + cancel_delayed_work(&chip->poweroff_work); + flush_scheduled_work(); +fail2: + if (client->irq) + free_irq(client->irq, indio_dev); +fail1: + iio_device_free(indio_dev); + 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); + if (client->irq) + free_irq(client->irq, indio_dev); + + iio_device_free(indio_dev); + + 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"); |