| /* |
| * drivers/i2c/chips/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/platform_device.h> |
| #include <linux/pm.h> |
| #include <linux/hwmon.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| |
| #include "../iio.h" |
| #include "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 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 iio_dev *indio_dev; |
| struct delayed_work poweroff_work; |
| |
| struct work_struct work_thresh; |
| s64 event_timestamp; |
| /* Remember state for suspend and resume functions */ |
| pm_message_t state; |
| |
| struct tsl2563_gainlevel_coeff *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_write(struct i2c_client *client, u8 reg, u8 value) |
| { |
| int ret; |
| u8 buf[2]; |
| |
| buf[0] = TSL2563_CMD | reg; |
| buf[1] = value; |
| |
| ret = i2c_master_send(client, buf, sizeof(buf)); |
| return (ret == sizeof(buf)) ? 0 : ret; |
| } |
| |
| static int tsl2563_read(struct i2c_client *client, u8 reg, void *buf, int len) |
| { |
| int ret; |
| u8 cmd = TSL2563_CMD | reg; |
| |
| ret = i2c_master_send(client, &cmd, sizeof(cmd)); |
| if (ret != sizeof(cmd)) |
| return ret; |
| |
| return i2c_master_recv(client, buf, len); |
| } |
| |
| 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 tsl2563_write(client, 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; |
| u8 val; |
| |
| ret = tsl2563_read(client, TSL2563_REG_CTRL, &val, sizeof(val)); |
| if (ret != sizeof(val)) |
| return ret; |
| |
| return (val & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON; |
| } |
| |
| static int tsl2563_configure(struct tsl2563_chip *chip) |
| { |
| int ret; |
| |
| ret = tsl2563_write(chip->client, TSL2563_REG_TIMING, |
| chip->gainlevel->gaintime); |
| if (ret) |
| goto error_ret; |
| ret = tsl2563_write(chip->client, TSL2563_REG_HIGHLOW, |
| chip->high_thres & 0xFF); |
| if (ret) |
| goto error_ret; |
| ret = tsl2563_write(chip->client, TSL2563_REG_HIGHHIGH, |
| (chip->high_thres >> 8) & 0xFF); |
| if (ret) |
| goto error_ret; |
| ret = tsl2563_write(chip->client, TSL2563_REG_LOWLOW, |
| chip->low_thres & 0xFF); |
| if (ret) |
| goto error_ret; |
| ret = tsl2563_write(chip->client, 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 = tsl2563_read(client, TSL2563_REG_ID, id, sizeof(*id)); |
| if (ret != sizeof(*id)) |
| return 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--; |
| |
| tsl2563_write(client, 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; |
| u8 buf0[2], buf1[2]; |
| u16 adc0, adc1; |
| int retry = 1; |
| int ret = 0; |
| |
| if (chip->state.event != PM_EVENT_ON) |
| 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 = tsl2563_read(client, |
| TSL2563_REG_DATA0LOW, |
| buf0, sizeof(buf0)); |
| if (ret != sizeof(buf0)) |
| goto out; |
| |
| ret = tsl2563_read(client, TSL2563_REG_DATA1LOW, |
| buf1, sizeof(buf1)); |
| if (ret != sizeof(buf1)) |
| goto out; |
| |
| adc0 = (buf0[1] << 8) + buf0[0]; |
| adc1 = (buf1[1] << 8) + buf1[0]; |
| |
| 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); |
| } |
| |
| /*--------------------------------------------------------------*/ |
| /* Sysfs interface */ |
| /*--------------------------------------------------------------*/ |
| |
| static ssize_t tsl2563_adc_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| |
| mutex_lock(&chip->lock); |
| |
| ret = tsl2563_get_adc(chip); |
| if (ret) |
| goto out; |
| |
| switch (this_attr->address) { |
| case 0: |
| ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data0); |
| break; |
| case 1: |
| ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data1); |
| break; |
| } |
| out: |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| /* 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 ssize_t tsl2563_lux_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| u32 calib0, calib1; |
| int ret; |
| |
| mutex_lock(&chip->lock); |
| |
| ret = tsl2563_get_adc(chip); |
| if (ret) |
| goto out; |
| |
| calib0 = calib_adc(chip->data0, chip->calib0) * chip->cover_comp_gain; |
| calib1 = calib_adc(chip->data1, chip->calib1) * chip->cover_comp_gain; |
| |
| ret = snprintf(buf, PAGE_SIZE, "%d\n", adc_to_lux(calib0, calib1)); |
| |
| out: |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static ssize_t format_calib(char *buf, int len, u32 calib) |
| { |
| return snprintf(buf, PAGE_SIZE, "%d\n", calib_to_sysfs(calib)); |
| } |
| |
| static ssize_t tsl2563_calib_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| |
| mutex_lock(&chip->lock); |
| switch (this_attr->address) { |
| case 0: |
| ret = format_calib(buf, PAGE_SIZE, chip->calib0); |
| break; |
| case 1: |
| ret = format_calib(buf, PAGE_SIZE, chip->calib1); |
| break; |
| default: |
| ret = -ENODEV; |
| } |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static ssize_t tsl2563_calib_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int value; |
| u32 calib; |
| |
| if (1 != sscanf(buf, "%d", &value)) |
| return -EINVAL; |
| |
| calib = calib_from_sysfs(value); |
| |
| switch (this_attr->address) { |
| case 0: |
| chip->calib0 = calib; |
| break; |
| case 1: |
| chip->calib1 = calib; |
| break; |
| } |
| |
| return len; |
| } |
| |
| static IIO_DEVICE_ATTR(intensity_both_raw, S_IRUGO, |
| tsl2563_adc_show, NULL, 0); |
| static IIO_DEVICE_ATTR(intensity_ir_raw, S_IRUGO, |
| tsl2563_adc_show, NULL, 1); |
| static DEVICE_ATTR(illuminance0_input, S_IRUGO, tsl2563_lux_show, NULL); |
| static IIO_DEVICE_ATTR(intensity_both_calibgain, S_IRUGO | S_IWUSR, |
| tsl2563_calib_show, tsl2563_calib_store, 0); |
| static IIO_DEVICE_ATTR(intensity_ir_calibgain, S_IRUGO | S_IWUSR, |
| tsl2563_calib_show, tsl2563_calib_store, 1); |
| |
| static ssize_t tsl2563_show_name(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| return sprintf(buf, "%s\n", chip->client->name); |
| } |
| |
| static DEVICE_ATTR(name, S_IRUGO, tsl2563_show_name, NULL); |
| |
| static struct attribute *tsl2563_attributes[] = { |
| &iio_dev_attr_intensity_both_raw.dev_attr.attr, |
| &iio_dev_attr_intensity_ir_raw.dev_attr.attr, |
| &dev_attr_illuminance0_input.attr, |
| &iio_dev_attr_intensity_both_calibgain.dev_attr.attr, |
| &iio_dev_attr_intensity_ir_calibgain.dev_attr.attr, |
| &dev_attr_name.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group tsl2563_group = { |
| .attrs = tsl2563_attributes, |
| }; |
| |
| static ssize_t tsl2563_read_thresh(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| u16 val = 0; |
| switch (this_attr->address) { |
| case TSL2563_REG_HIGHLOW: |
| val = chip->high_thres; |
| break; |
| case TSL2563_REG_LOWLOW: |
| val = chip->low_thres; |
| break; |
| } |
| return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| } |
| |
| static ssize_t tsl2563_write_thresh(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| unsigned long val; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &val); |
| if (ret) |
| return ret; |
| mutex_lock(&chip->lock); |
| ret = tsl2563_write(chip->client, this_attr->address, val & 0xFF); |
| if (ret) |
| goto error_ret; |
| ret = tsl2563_write(chip->client, this_attr->address + 1, |
| (val >> 8) & 0xFF); |
| switch (this_attr->address) { |
| case TSL2563_REG_HIGHLOW: |
| chip->high_thres = val; |
| break; |
| case TSL2563_REG_LOWLOW: |
| chip->low_thres = val; |
| break; |
| } |
| |
| error_ret: |
| mutex_unlock(&chip->lock); |
| |
| return ret < 0 ? ret : len; |
| } |
| |
| static IIO_DEVICE_ATTR(intensity_both_thresh_high_value, |
| S_IRUGO | S_IWUSR, |
| tsl2563_read_thresh, |
| tsl2563_write_thresh, |
| TSL2563_REG_HIGHLOW); |
| |
| static IIO_DEVICE_ATTR(intensity_both_thresh_low_value, |
| S_IRUGO | S_IWUSR, |
| tsl2563_read_thresh, |
| tsl2563_write_thresh, |
| TSL2563_REG_LOWLOW); |
| |
| static int tsl2563_int_th(struct iio_dev *dev_info, |
| int index, |
| s64 timestamp, |
| int not_test) |
| { |
| struct tsl2563_chip *chip = dev_info->dev_data; |
| |
| chip->event_timestamp = timestamp; |
| schedule_work(&chip->work_thresh); |
| |
| return 0; |
| } |
| |
| static void tsl2563_int_bh(struct work_struct *work_s) |
| { |
| struct tsl2563_chip *chip |
| = container_of(work_s, |
| struct tsl2563_chip, work_thresh); |
| u8 cmd = TSL2563_CMD | TSL2563_CLEARINT; |
| |
| iio_push_event(chip->indio_dev, 0, |
| IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_LIGHT, |
| 0, |
| IIO_EV_TYPE_THRESH, |
| IIO_EV_DIR_EITHER), |
| chip->event_timestamp); |
| |
| /* reenable_irq */ |
| enable_irq(chip->client->irq); |
| /* clear the interrupt and push the event */ |
| i2c_master_send(chip->client, &cmd, sizeof(cmd)); |
| |
| } |
| |
| static ssize_t tsl2563_write_interrupt_config(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| struct iio_event_attr *this_attr = to_iio_event_attr(attr); |
| int input, ret = 0; |
| |
| ret = sscanf(buf, "%d", &input); |
| if (ret != 1) |
| return -EINVAL; |
| mutex_lock(&chip->lock); |
| if (input && !(chip->intr & 0x30)) { |
| iio_add_event_to_list(this_attr->listel, |
| &indio_dev->interrupts[0]->ev_list); |
| 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 = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr); |
| chip->int_enabled = true; |
| } |
| |
| if (!input && (chip->intr & 0x30)) { |
| chip->intr |= ~0x30; |
| ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr); |
| iio_remove_event_from_list(this_attr->listel, |
| &indio_dev->interrupts[0]->ev_list); |
| 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 < 0) ? ret : len; |
| } |
| |
| static ssize_t tsl2563_read_interrupt_config(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct tsl2563_chip *chip = indio_dev->dev_data; |
| int ret; |
| u8 rxbuf; |
| ssize_t len; |
| |
| mutex_lock(&chip->lock); |
| ret = tsl2563_read(chip->client, |
| TSL2563_REG_INT, |
| &rxbuf, |
| sizeof(rxbuf)); |
| mutex_unlock(&chip->lock); |
| if (ret < 0) |
| goto error_ret; |
| len = snprintf(buf, PAGE_SIZE, "%d\n", !!(rxbuf & 0x30)); |
| error_ret: |
| |
| return (ret < 0) ? ret : len; |
| } |
| |
| IIO_EVENT_ATTR(intensity_both_thresh_both_en, |
| tsl2563_read_interrupt_config, |
| tsl2563_write_interrupt_config, |
| 0, |
| tsl2563_int_th); |
| |
| static struct attribute *tsl2563_event_attributes[] = { |
| &iio_event_attr_intensity_both_thresh_both_en.dev_attr.attr, |
| &iio_dev_attr_intensity_both_thresh_high_value.dev_attr.attr, |
| &iio_dev_attr_intensity_both_thresh_low_value.dev_attr.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group tsl2563_event_attribute_group = { |
| .attrs = tsl2563_event_attributes, |
| }; |
| |
| /*--------------------------------------------------------------*/ |
| /* Probe, Attach, Remove */ |
| /*--------------------------------------------------------------*/ |
| static struct i2c_driver tsl2563_i2c_driver; |
| |
| static int __devinit tsl2563_probe(struct i2c_client *client, |
| const struct i2c_device_id *device_id) |
| { |
| struct tsl2563_chip *chip; |
| struct tsl2563_platform_data *pdata = client->dev.platform_data; |
| int err = 0; |
| int ret; |
| u8 id; |
| |
| chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| INIT_WORK(&chip->work_thresh, tsl2563_int_bh); |
| i2c_set_clientdata(client, chip); |
| chip->client = client; |
| |
| err = tsl2563_detect(chip); |
| if (err) { |
| dev_err(&client->dev, "device not found, error %d\n", -err); |
| goto fail1; |
| } |
| |
| err = tsl2563_read_id(chip, &id); |
| if (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); |
| |
| chip->indio_dev = iio_allocate_device(); |
| if (!chip->indio_dev) |
| goto fail1; |
| chip->indio_dev->attrs = &tsl2563_group; |
| chip->indio_dev->dev.parent = &client->dev; |
| chip->indio_dev->dev_data = (void *)(chip); |
| chip->indio_dev->driver_module = THIS_MODULE; |
| chip->indio_dev->modes = INDIO_DIRECT_MODE; |
| if (client->irq) { |
| chip->indio_dev->num_interrupt_lines = 1; |
| chip->indio_dev->event_attrs |
| = &tsl2563_event_attribute_group; |
| } |
| ret = iio_device_register(chip->indio_dev); |
| if (ret) |
| goto fail1; |
| |
| if (client->irq) { |
| ret = iio_register_interrupt_line(client->irq, |
| chip->indio_dev, |
| 0, |
| IRQF_TRIGGER_RISING, |
| client->name); |
| if (ret) |
| goto fail2; |
| } |
| err = tsl2563_configure(chip); |
| if (err) |
| goto fail3; |
| |
| 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); |
| |
| return 0; |
| fail3: |
| if (client->irq) |
| iio_unregister_interrupt_line(chip->indio_dev, 0); |
| fail2: |
| iio_device_unregister(chip->indio_dev); |
| fail1: |
| kfree(chip); |
| return err; |
| } |
| |
| static int tsl2563_remove(struct i2c_client *client) |
| { |
| struct tsl2563_chip *chip = i2c_get_clientdata(client); |
| if (!chip->int_enabled) |
| cancel_delayed_work(&chip->poweroff_work); |
| /* Ensure that interrupts are disabled - then flush any bottom halves */ |
| chip->intr |= ~0x30; |
| tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr); |
| flush_scheduled_work(); |
| tsl2563_set_power(chip, 0); |
| if (client->irq) |
| iio_unregister_interrupt_line(chip->indio_dev, 0); |
| iio_device_unregister(chip->indio_dev); |
| |
| kfree(chip); |
| return 0; |
| } |
| |
| static int tsl2563_suspend(struct i2c_client *client, pm_message_t state) |
| { |
| struct tsl2563_chip *chip = i2c_get_clientdata(client); |
| int ret; |
| |
| mutex_lock(&chip->lock); |
| |
| ret = tsl2563_set_power(chip, 0); |
| if (ret) |
| goto out; |
| |
| chip->state = state; |
| |
| out: |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static int tsl2563_resume(struct i2c_client *client) |
| { |
| struct tsl2563_chip *chip = i2c_get_clientdata(client); |
| 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->state.event = PM_EVENT_ON; |
| |
| out: |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| 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", |
| }, |
| .suspend = tsl2563_suspend, |
| .resume = tsl2563_resume, |
| .probe = tsl2563_probe, |
| .remove = __devexit_p(tsl2563_remove), |
| .id_table = tsl2563_id, |
| }; |
| |
| static int __init tsl2563_init(void) |
| { |
| return i2c_add_driver(&tsl2563_i2c_driver); |
| } |
| |
| static void __exit tsl2563_exit(void) |
| { |
| i2c_del_driver(&tsl2563_i2c_driver); |
| } |
| |
| MODULE_AUTHOR("Nokia Corporation"); |
| MODULE_DESCRIPTION("tsl2563 light sensor driver"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(tsl2563_init); |
| module_exit(tsl2563_exit); |