diff options
Diffstat (limited to 'drivers/iio/light/apds9960.c')
| -rw-r--r-- | drivers/iio/light/apds9960.c | 1131 |
1 files changed, 1131 insertions, 0 deletions
diff --git a/drivers/iio/light/apds9960.c b/drivers/iio/light/apds9960.c new file mode 100644 index 000000000..f6a07dc32 --- /dev/null +++ b/drivers/iio/light/apds9960.c @@ -0,0 +1,1131 @@ +/* + * apds9960.c - Support for Avago APDS9960 gesture/RGB/ALS/proximity sensor + * + * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com> + * + * 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. + * + * TODO: gesture + proximity calib offsets + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/err.h> +#include <linux/irq.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/events.h> +#include <linux/iio/kfifo_buf.h> +#include <linux/iio/sysfs.h> +#include <linux/of_gpio.h> + +#define APDS9960_REGMAP_NAME "apds9960_regmap" +#define APDS9960_DRV_NAME "apds9960" + +#define APDS9960_REG_RAM_START 0x00 +#define APDS9960_REG_RAM_END 0x7f + +#define APDS9960_REG_ENABLE 0x80 +#define APDS9960_REG_ATIME 0x81 +#define APDS9960_REG_WTIME 0x83 + +#define APDS9960_REG_AILTL 0x84 +#define APDS9960_REG_AILTH 0x85 +#define APDS9960_REG_AIHTL 0x86 +#define APDS9960_REG_AIHTH 0x87 + +#define APDS9960_REG_PILT 0x89 +#define APDS9960_REG_PIHT 0x8b +#define APDS9960_REG_PERS 0x8c + +#define APDS9960_REG_CONFIG_1 0x8d +#define APDS9960_REG_PPULSE 0x8e + +#define APDS9960_REG_CONTROL 0x8f +#define APDS9960_REG_CONTROL_AGAIN_MASK 0x03 +#define APDS9960_REG_CONTROL_PGAIN_MASK 0x0c +#define APDS9960_REG_CONTROL_AGAIN_MASK_SHIFT 0 +#define APDS9960_REG_CONTROL_PGAIN_MASK_SHIFT 2 + +#define APDS9960_REG_CONFIG_2 0x90 +#define APDS9960_REG_CONFIG_2_GGAIN_MASK 0x60 +#define APDS9960_REG_CONFIG_2_GGAIN_MASK_SHIFT 5 + +#define APDS9960_REG_ID 0x92 + +#define APDS9960_REG_STATUS 0x93 +#define APDS9960_REG_STATUS_PS_INT BIT(5) +#define APDS9960_REG_STATUS_ALS_INT BIT(4) +#define APDS9960_REG_STATUS_GINT BIT(2) + +#define APDS9960_REG_PDATA 0x9c +#define APDS9960_REG_POFFSET_UR 0x9d +#define APDS9960_REG_POFFSET_DL 0x9e +#define APDS9960_REG_CONFIG_3 0x9f + +#define APDS9960_REG_GPENTH 0xa0 +#define APDS9960_REG_GEXTH 0xa1 + +#define APDS9960_REG_GCONF_1 0xa2 +#define APDS9960_REG_GCONF_1_GFIFO_THRES_MASK 0xc0 +#define APDS9960_REG_GCONF_1_GFIFO_THRES_MASK_SHIFT 6 + +#define APDS9960_REG_GCONF_2 0xa3 +#define APDS9960_REG_GOFFSET_U 0xa4 +#define APDS9960_REG_GOFFSET_D 0xa5 +#define APDS9960_REG_GPULSE 0xa6 +#define APDS9960_REG_GOFFSET_L 0xa7 +#define APDS9960_REG_GOFFSET_R 0xa9 +#define APDS9960_REG_GCONF_3 0xaa + +#define APDS9960_REG_GCONF_4 0xab +#define APDS9960_REG_GFLVL 0xae +#define APDS9960_REG_GSTATUS 0xaf + +#define APDS9960_REG_IFORCE 0xe4 +#define APDS9960_REG_PICLEAR 0xe5 +#define APDS9960_REG_CICLEAR 0xe6 +#define APDS9960_REG_AICLEAR 0xe7 + +#define APDS9960_DEFAULT_PERS 0x33 +#define APDS9960_DEFAULT_GPENTH 0x50 +#define APDS9960_DEFAULT_GEXTH 0x40 + +#define APDS9960_MAX_PXS_THRES_VAL 255 +#define APDS9960_MAX_ALS_THRES_VAL 0xffff +#define APDS9960_MAX_INT_TIME_IN_US 1000000 + +enum apds9960_als_channel_idx { + IDX_ALS_CLEAR, IDX_ALS_RED, IDX_ALS_GREEN, IDX_ALS_BLUE, +}; + +#define APDS9960_REG_ALS_BASE 0x94 +#define APDS9960_REG_ALS_CHANNEL(_colour) \ + (APDS9960_REG_ALS_BASE + (IDX_ALS_##_colour * 2)) + +enum apds9960_gesture_channel_idx { + IDX_DIR_UP, IDX_DIR_DOWN, IDX_DIR_LEFT, IDX_DIR_RIGHT, +}; + +#define APDS9960_REG_GFIFO_BASE 0xfc +#define APDS9960_REG_GFIFO_DIR(_dir) \ + (APDS9960_REG_GFIFO_BASE + IDX_DIR_##_dir) + +struct apds9960_data { + struct i2c_client *client; + struct iio_dev *indio_dev; + struct mutex lock; + + /* regmap fields */ + struct regmap *regmap; + struct regmap_field *reg_int_als; + struct regmap_field *reg_int_ges; + struct regmap_field *reg_int_pxs; + + struct regmap_field *reg_enable_als; + struct regmap_field *reg_enable_ges; + struct regmap_field *reg_enable_pxs; + + /* state */ + int als_int; + int pxs_int; + int gesture_mode_running; + + /* gain values */ + int als_gain; + int pxs_gain; + + /* integration time value in us */ + int als_adc_int_us; + + /* gesture buffer */ + u8 buffer[4]; /* 4 8-bit channels */ +}; + +static const struct reg_default apds9960_reg_defaults[] = { + /* Default ALS integration time = 2.48ms */ + { APDS9960_REG_ATIME, 0xff }, +}; + +static const struct regmap_range apds9960_volatile_ranges[] = { + regmap_reg_range(APDS9960_REG_STATUS, + APDS9960_REG_PDATA), + regmap_reg_range(APDS9960_REG_GFLVL, + APDS9960_REG_GSTATUS), + regmap_reg_range(APDS9960_REG_GFIFO_DIR(UP), + APDS9960_REG_GFIFO_DIR(RIGHT)), + regmap_reg_range(APDS9960_REG_IFORCE, + APDS9960_REG_AICLEAR), +}; + +static const struct regmap_access_table apds9960_volatile_table = { + .yes_ranges = apds9960_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(apds9960_volatile_ranges), +}; + +static const struct regmap_range apds9960_precious_ranges[] = { + regmap_reg_range(APDS9960_REG_RAM_START, APDS9960_REG_RAM_END), +}; + +static const struct regmap_access_table apds9960_precious_table = { + .yes_ranges = apds9960_precious_ranges, + .n_yes_ranges = ARRAY_SIZE(apds9960_precious_ranges), +}; + +static const struct regmap_range apds9960_readable_ranges[] = { + regmap_reg_range(APDS9960_REG_ENABLE, + APDS9960_REG_GSTATUS), + regmap_reg_range(APDS9960_REG_GFIFO_DIR(UP), + APDS9960_REG_GFIFO_DIR(RIGHT)), +}; + +static const struct regmap_access_table apds9960_readable_table = { + .yes_ranges = apds9960_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(apds9960_readable_ranges), +}; + +static const struct regmap_range apds9960_writeable_ranges[] = { + regmap_reg_range(APDS9960_REG_ENABLE, APDS9960_REG_CONFIG_2), + regmap_reg_range(APDS9960_REG_POFFSET_UR, APDS9960_REG_GCONF_4), + regmap_reg_range(APDS9960_REG_IFORCE, APDS9960_REG_AICLEAR), +}; + +static const struct regmap_access_table apds9960_writeable_table = { + .yes_ranges = apds9960_writeable_ranges, + .n_yes_ranges = ARRAY_SIZE(apds9960_writeable_ranges), +}; + +static const struct regmap_config apds9960_regmap_config = { + .name = APDS9960_REGMAP_NAME, + .reg_bits = 8, + .val_bits = 8, + .use_single_rw = 1, + + .volatile_table = &apds9960_volatile_table, + .precious_table = &apds9960_precious_table, + .rd_table = &apds9960_readable_table, + .wr_table = &apds9960_writeable_table, + + .reg_defaults = apds9960_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(apds9960_reg_defaults), + .max_register = APDS9960_REG_GFIFO_DIR(RIGHT), + .cache_type = REGCACHE_RBTREE, +}; + +static const struct iio_event_spec apds9960_pxs_event_spec[] = { + { + .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_event_spec apds9960_als_event_spec[] = { + { + .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), + }, +}; + +#define APDS9960_GESTURE_CHANNEL(_dir, _si) { \ + .type = IIO_PROXIMITY, \ + .channel = _si + 1, \ + .scan_index = _si, \ + .indexed = 1, \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 8, \ + .storagebits = 8, \ + }, \ +} + +#define APDS9960_INTENSITY_CHANNEL(_colour) { \ + .type = IIO_INTENSITY, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_INT_TIME), \ + .channel2 = IIO_MOD_LIGHT_##_colour, \ + .address = APDS9960_REG_ALS_CHANNEL(_colour), \ + .modified = 1, \ + .scan_index = -1, \ +} + +static const unsigned long apds9960_scan_masks[] = {0xf, 0}; + +static const struct iio_chan_spec apds9960_channels[] = { + { + .type = IIO_PROXIMITY, + .address = APDS9960_REG_PDATA, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), + .channel = 0, + .indexed = 0, + .scan_index = -1, + + .event_spec = apds9960_pxs_event_spec, + .num_event_specs = ARRAY_SIZE(apds9960_pxs_event_spec), + }, + /* Gesture Sensor */ + APDS9960_GESTURE_CHANNEL(UP, 0), + APDS9960_GESTURE_CHANNEL(DOWN, 1), + APDS9960_GESTURE_CHANNEL(LEFT, 2), + APDS9960_GESTURE_CHANNEL(RIGHT, 3), + /* ALS */ + { + .type = IIO_INTENSITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_INT_TIME), + .channel2 = IIO_MOD_LIGHT_CLEAR, + .address = APDS9960_REG_ALS_CHANNEL(CLEAR), + .modified = 1, + .scan_index = -1, + + .event_spec = apds9960_als_event_spec, + .num_event_specs = ARRAY_SIZE(apds9960_als_event_spec), + }, + /* RGB Sensor */ + APDS9960_INTENSITY_CHANNEL(RED), + APDS9960_INTENSITY_CHANNEL(GREEN), + APDS9960_INTENSITY_CHANNEL(BLUE), +}; + +/* integration time in us */ +static const int apds9960_int_time[][2] = + { {28000, 246}, {100000, 219}, {200000, 182}, {700000, 0} }; + +/* gain mapping */ +static const int apds9960_pxs_gain_map[] = {1, 2, 4, 8}; +static const int apds9960_als_gain_map[] = {1, 4, 16, 64}; + +static IIO_CONST_ATTR(proximity_scale_available, "1 2 4 8"); +static IIO_CONST_ATTR(intensity_scale_available, "1 4 16 64"); +static IIO_CONST_ATTR_INT_TIME_AVAIL("0.028 0.1 0.2 0.7"); + +static struct attribute *apds9960_attributes[] = { + &iio_const_attr_proximity_scale_available.dev_attr.attr, + &iio_const_attr_intensity_scale_available.dev_attr.attr, + &iio_const_attr_integration_time_available.dev_attr.attr, + NULL, +}; + +static struct attribute_group apds9960_attribute_group = { + .attrs = apds9960_attributes, +}; + +static const struct reg_field apds9960_reg_field_int_als = + REG_FIELD(APDS9960_REG_ENABLE, 4, 4); + +static const struct reg_field apds9960_reg_field_int_ges = + REG_FIELD(APDS9960_REG_GCONF_4, 1, 1); + +static const struct reg_field apds9960_reg_field_int_pxs = + REG_FIELD(APDS9960_REG_ENABLE, 5, 5); + +static const struct reg_field apds9960_reg_field_enable_als = + REG_FIELD(APDS9960_REG_ENABLE, 1, 1); + +static const struct reg_field apds9960_reg_field_enable_ges = + REG_FIELD(APDS9960_REG_ENABLE, 6, 6); + +static const struct reg_field apds9960_reg_field_enable_pxs = + REG_FIELD(APDS9960_REG_ENABLE, 2, 2); + +static int apds9960_set_it_time(struct apds9960_data *data, int val2) +{ + int ret = -EINVAL; + int idx; + + for (idx = 0; idx < ARRAY_SIZE(apds9960_int_time); idx++) { + if (apds9960_int_time[idx][0] == val2) { + mutex_lock(&data->lock); + ret = regmap_write(data->regmap, APDS9960_REG_ATIME, + apds9960_int_time[idx][1]); + if (!ret) + data->als_adc_int_us = val2; + mutex_unlock(&data->lock); + break; + } + } + + return ret; +} + +static int apds9960_set_pxs_gain(struct apds9960_data *data, int val) +{ + int ret = -EINVAL; + int idx; + + for (idx = 0; idx < ARRAY_SIZE(apds9960_pxs_gain_map); idx++) { + if (apds9960_pxs_gain_map[idx] == val) { + /* pxs + gesture gains are mirrored */ + mutex_lock(&data->lock); + ret = regmap_update_bits(data->regmap, + APDS9960_REG_CONTROL, + APDS9960_REG_CONTROL_PGAIN_MASK, + idx << APDS9960_REG_CONTROL_PGAIN_MASK_SHIFT); + if (ret) { + mutex_unlock(&data->lock); + break; + } + + ret = regmap_update_bits(data->regmap, + APDS9960_REG_CONFIG_2, + APDS9960_REG_CONFIG_2_GGAIN_MASK, + idx << APDS9960_REG_CONFIG_2_GGAIN_MASK_SHIFT); + if (!ret) + data->pxs_gain = idx; + mutex_unlock(&data->lock); + break; + } + } + + return ret; +} + +static int apds9960_set_als_gain(struct apds9960_data *data, int val) +{ + int ret = -EINVAL; + int idx; + + for (idx = 0; idx < ARRAY_SIZE(apds9960_als_gain_map); idx++) { + if (apds9960_als_gain_map[idx] == val) { + mutex_lock(&data->lock); + ret = regmap_update_bits(data->regmap, + APDS9960_REG_CONTROL, + APDS9960_REG_CONTROL_AGAIN_MASK, idx); + if (!ret) + data->als_gain = idx; + mutex_unlock(&data->lock); + break; + } + } + + return ret; +} + +#ifdef CONFIG_PM +static int apds9960_set_power_state(struct apds9960_data *data, bool on) +{ + struct device *dev = &data->client->dev; + int ret = 0; + + mutex_lock(&data->lock); + + if (on) { + int suspended; + + suspended = pm_runtime_suspended(dev); + ret = pm_runtime_get_sync(dev); + + /* Allow one integration cycle before allowing a reading */ + if (suspended) + usleep_range(data->als_adc_int_us, + APDS9960_MAX_INT_TIME_IN_US); + } else { + pm_runtime_mark_last_busy(dev); + ret = pm_runtime_put_autosuspend(dev); + } + + mutex_unlock(&data->lock); + + return ret; +} +#else +static int apds9960_set_power_state(struct apds9960_data *data, bool on) +{ + return 0; +} +#endif + +static int apds9960_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct apds9960_data *data = iio_priv(indio_dev); + __le16 buf; + int ret = -EINVAL; + + if (data->gesture_mode_running) + return -EBUSY; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + apds9960_set_power_state(data, true); + switch (chan->type) { + case IIO_PROXIMITY: + ret = regmap_read(data->regmap, chan->address, val); + if (!ret) + ret = IIO_VAL_INT; + break; + case IIO_INTENSITY: + ret = regmap_bulk_read(data->regmap, chan->address, + &buf, 2); + if (!ret) + ret = IIO_VAL_INT; + *val = le16_to_cpu(buf); + break; + default: + ret = -EINVAL; + } + apds9960_set_power_state(data, false); + break; + case IIO_CHAN_INFO_INT_TIME: + /* RGB + ALS sensors only have integration time */ + mutex_lock(&data->lock); + switch (chan->type) { + case IIO_INTENSITY: + *val = 0; + *val2 = data->als_adc_int_us; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + ret = -EINVAL; + } + mutex_unlock(&data->lock); + break; + case IIO_CHAN_INFO_SCALE: + mutex_lock(&data->lock); + switch (chan->type) { + case IIO_PROXIMITY: + *val = apds9960_pxs_gain_map[data->pxs_gain]; + ret = IIO_VAL_INT; + break; + case IIO_INTENSITY: + *val = apds9960_als_gain_map[data->als_gain]; + ret = IIO_VAL_INT; + break; + default: + ret = -EINVAL; + } + mutex_unlock(&data->lock); + break; + } + + return ret; +}; + +static int apds9960_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct apds9960_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + /* RGB + ALS sensors only have int time */ + switch (chan->type) { + case IIO_INTENSITY: + if (val != 0) + return -EINVAL; + return apds9960_set_it_time(data, val2); + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + if (val2 != 0) + return -EINVAL; + switch (chan->type) { + case IIO_PROXIMITY: + return apds9960_set_pxs_gain(data, val); + case IIO_INTENSITY: + return apds9960_set_als_gain(data, val); + default: + return -EINVAL; + } + default: + return -EINVAL; + }; + + return 0; +} + +static inline int apds9960_get_thres_reg(const struct iio_chan_spec *chan, + enum iio_event_direction dir, + u8 *reg) +{ + switch (dir) { + case IIO_EV_DIR_RISING: + switch (chan->type) { + case IIO_PROXIMITY: + *reg = APDS9960_REG_PIHT; + break; + case IIO_INTENSITY: + *reg = APDS9960_REG_AIHTL; + break; + default: + return -EINVAL; + } + break; + case IIO_EV_DIR_FALLING: + switch (chan->type) { + case IIO_PROXIMITY: + *reg = APDS9960_REG_PILT; + break; + case IIO_INTENSITY: + *reg = APDS9960_REG_AILTL; + break; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + + return 0; +} + +static int apds9960_read_event(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) +{ + u8 reg; + __le16 buf; + int ret = 0; + struct apds9960_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + ret = apds9960_get_thres_reg(chan, dir, ®); + if (ret < 0) + return ret; + + if (chan->type == IIO_PROXIMITY) { + ret = regmap_read(data->regmap, reg, val); + if (ret < 0) + return ret; + } else if (chan->type == IIO_INTENSITY) { + ret = regmap_bulk_read(data->regmap, reg, &buf, 2); + if (ret < 0) + return ret; + *val = le16_to_cpu(buf); + } else + return -EINVAL; + + *val2 = 0; + + return IIO_VAL_INT; +} + +static int apds9960_write_event(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) +{ + u8 reg; + __le16 buf; + int ret = 0; + struct apds9960_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + ret = apds9960_get_thres_reg(chan, dir, ®); + if (ret < 0) + return ret; + + if (chan->type == IIO_PROXIMITY) { + if (val < 0 || val > APDS9960_MAX_PXS_THRES_VAL) + return -EINVAL; + ret = regmap_write(data->regmap, reg, val); + if (ret < 0) + return ret; + } else if (chan->type == IIO_INTENSITY) { + if (val < 0 || val > APDS9960_MAX_ALS_THRES_VAL) + return -EINVAL; + buf = cpu_to_le16(val); + ret = regmap_bulk_write(data->regmap, reg, &buf, 2); + if (ret < 0) + return ret; + } else + return -EINVAL; + + return 0; +} + +static int apds9960_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct apds9960_data *data = iio_priv(indio_dev); + + switch (chan->type) { + case IIO_PROXIMITY: + return data->pxs_int; + case IIO_INTENSITY: + return data->als_int; + default: + return -EINVAL; + } + + return 0; +} + +static int apds9960_write_event_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 apds9960_data *data = iio_priv(indio_dev); + int ret; + + state = !!state; + + switch (chan->type) { + case IIO_PROXIMITY: + if (data->pxs_int == state) + return -EINVAL; + + ret = regmap_field_write(data->reg_int_pxs, state); + if (ret) + return ret; + data->pxs_int = state; + apds9960_set_power_state(data, state); + break; + case IIO_INTENSITY: + if (data->als_int == state) + return -EINVAL; + + ret = regmap_field_write(data->reg_int_als, state); + if (ret) + return ret; + data->als_int = state; + apds9960_set_power_state(data, state); + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct iio_info apds9960_info = { + .driver_module = THIS_MODULE, + .attrs = &apds9960_attribute_group, + .read_raw = apds9960_read_raw, + .write_raw = apds9960_write_raw, + .read_event_value = apds9960_read_event, + .write_event_value = apds9960_write_event, + .read_event_config = apds9960_read_event_config, + .write_event_config = apds9960_write_event_config, + +}; + +static inline int apds9660_fifo_is_empty(struct apds9960_data *data) +{ + int cnt; + int ret; + + ret = regmap_read(data->regmap, APDS9960_REG_GFLVL, &cnt); + if (ret) + return ret; + + return cnt; +} + +static void apds9960_read_gesture_fifo(struct apds9960_data *data) +{ + int ret, cnt = 0; + + mutex_lock(&data->lock); + data->gesture_mode_running = 1; + + while (cnt-- || (cnt = apds9660_fifo_is_empty(data) > 0)) { + ret = regmap_bulk_read(data->regmap, APDS9960_REG_GFIFO_BASE, + &data->buffer, 4); + + if (ret) + goto err_read; + + iio_push_to_buffers(data->indio_dev, data->buffer); + } + +err_read: + data->gesture_mode_running = 0; + mutex_unlock(&data->lock); +} + +static irqreturn_t apds9960_interrupt_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct apds9960_data *data = iio_priv(indio_dev); + int ret, status; + + ret = regmap_read(data->regmap, APDS9960_REG_STATUS, &status); + if (ret < 0) { + dev_err(&data->client->dev, "irq status reg read failed\n"); + return IRQ_HANDLED; + } + + if ((status & APDS9960_REG_STATUS_ALS_INT) && data->als_int) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + iio_get_time_ns()); + regmap_write(data->regmap, APDS9960_REG_CICLEAR, 1); + } + + if ((status & APDS9960_REG_STATUS_PS_INT) && data->pxs_int) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + iio_get_time_ns()); + regmap_write(data->regmap, APDS9960_REG_PICLEAR, 1); + } + + if (status & APDS9960_REG_STATUS_GINT) + apds9960_read_gesture_fifo(data); + + return IRQ_HANDLED; +} + +static int apds9960_set_powermode(struct apds9960_data *data, bool state) +{ + return regmap_update_bits(data->regmap, APDS9960_REG_ENABLE, 1, state); +} + +static int apds9960_buffer_postenable(struct iio_dev *indio_dev) +{ + struct apds9960_data *data = iio_priv(indio_dev); + int ret; + + ret = regmap_field_write(data->reg_int_ges, 1); + if (ret) + return ret; + + ret = regmap_field_write(data->reg_enable_ges, 1); + if (ret) + return ret; + + pm_runtime_get_sync(&data->client->dev); + + return 0; +} + +static int apds9960_buffer_predisable(struct iio_dev *indio_dev) +{ + struct apds9960_data *data = iio_priv(indio_dev); + int ret; + + ret = regmap_field_write(data->reg_enable_ges, 0); + if (ret) + return ret; + + ret = regmap_field_write(data->reg_int_ges, 0); + if (ret) + return ret; + + pm_runtime_put_autosuspend(&data->client->dev); + + return 0; +} + +static const struct iio_buffer_setup_ops apds9960_buffer_setup_ops = { + .postenable = apds9960_buffer_postenable, + .predisable = apds9960_buffer_predisable, +}; + +static int apds9960_regfield_init(struct apds9960_data *data) +{ + struct device *dev = &data->client->dev; + struct regmap *regmap = data->regmap; + + data->reg_int_als = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_int_als); + if (IS_ERR(data->reg_int_als)) { + dev_err(dev, "INT ALS reg field init failed\n"); + return PTR_ERR(data->reg_int_als); + } + + data->reg_int_ges = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_int_ges); + if (IS_ERR(data->reg_int_ges)) { + dev_err(dev, "INT gesture reg field init failed\n"); + return PTR_ERR(data->reg_int_ges); + } + + data->reg_int_pxs = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_int_pxs); + if (IS_ERR(data->reg_int_pxs)) { + dev_err(dev, "INT pxs reg field init failed\n"); + return PTR_ERR(data->reg_int_pxs); + } + + data->reg_enable_als = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_enable_als); + if (IS_ERR(data->reg_enable_als)) { + dev_err(dev, "Enable ALS reg field init failed\n"); + return PTR_ERR(data->reg_enable_als); + } + + data->reg_enable_ges = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_enable_ges); + if (IS_ERR(data->reg_enable_ges)) { + dev_err(dev, "Enable gesture reg field init failed\n"); + return PTR_ERR(data->reg_enable_ges); + } + + data->reg_enable_pxs = devm_regmap_field_alloc(dev, regmap, + apds9960_reg_field_enable_pxs); + if (IS_ERR(data->reg_enable_pxs)) { + dev_err(dev, "Enable PXS reg field init failed\n"); + return PTR_ERR(data->reg_enable_pxs); + } + + return 0; +} + +static int apds9960_chip_init(struct apds9960_data *data) +{ + int ret; + + /* Default IT for ALS of 28 ms */ + ret = apds9960_set_it_time(data, 28000); + if (ret) + return ret; + + /* Ensure gesture interrupt is OFF */ + ret = regmap_field_write(data->reg_int_ges, 0); + if (ret) + return ret; + + /* Disable gesture sensor, since polling is useless from user-space */ + ret = regmap_field_write(data->reg_enable_ges, 0); + if (ret) + return ret; + + /* Ensure proximity interrupt is OFF */ + ret = regmap_field_write(data->reg_int_pxs, 0); + if (ret) + return ret; + + /* Enable proximity sensor for polling */ + ret = regmap_field_write(data->reg_enable_pxs, 1); + if (ret) + return ret; + + /* Ensure ALS interrupt is OFF */ + ret = regmap_field_write(data->reg_int_als, 0); + if (ret) + return ret; + + /* Enable ALS sensor for polling */ + ret = regmap_field_write(data->reg_enable_als, 1); + if (ret) + return ret; + /* + * When enabled trigger an interrupt after 3 readings + * outside threshold for ALS + PXS + */ + ret = regmap_write(data->regmap, APDS9960_REG_PERS, + APDS9960_DEFAULT_PERS); + if (ret) + return ret; + + /* + * Wait for 4 event outside gesture threshold to prevent interrupt + * flooding. + */ + ret = regmap_update_bits(data->regmap, APDS9960_REG_GCONF_1, + APDS9960_REG_GCONF_1_GFIFO_THRES_MASK, + BIT(0) << APDS9960_REG_GCONF_1_GFIFO_THRES_MASK_SHIFT); + if (ret) + return ret; + + /* Default ENTER and EXIT thresholds for the GESTURE engine. */ + ret = regmap_write(data->regmap, APDS9960_REG_GPENTH, + APDS9960_DEFAULT_GPENTH); + if (ret) + return ret; + + ret = regmap_write(data->regmap, APDS9960_REG_GEXTH, + APDS9960_DEFAULT_GEXTH); + if (ret) + return ret; + + return apds9960_set_powermode(data, 1); +} + +static int apds9960_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct apds9960_data *data; + struct iio_buffer *buffer; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + buffer = devm_iio_kfifo_allocate(&client->dev); + if (!buffer) + return -ENOMEM; + + iio_device_attach_buffer(indio_dev, buffer); + + indio_dev->info = &apds9960_info; + indio_dev->name = APDS9960_DRV_NAME; + indio_dev->channels = apds9960_channels; + indio_dev->num_channels = ARRAY_SIZE(apds9960_channels); + indio_dev->available_scan_masks = apds9960_scan_masks; + indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE); + indio_dev->setup_ops = &apds9960_buffer_setup_ops; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + + data->regmap = devm_regmap_init_i2c(client, &apds9960_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(&client->dev, "regmap initialization failed.\n"); + return PTR_ERR(data->regmap); + } + + data->client = client; + data->indio_dev = indio_dev; + mutex_init(&data->lock); + + ret = pm_runtime_set_active(&client->dev); + if (ret) + goto error_power_down; + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, 5000); + pm_runtime_use_autosuspend(&client->dev); + + apds9960_set_power_state(data, true); + + ret = apds9960_regfield_init(data); + if (ret) + goto error_power_down; + + ret = apds9960_chip_init(data); + if (ret) + goto error_power_down; + + if (client->irq <= 0) { + dev_err(&client->dev, "no valid irq defined\n"); + ret = -EINVAL; + goto error_power_down; + } + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, apds9960_interrupt_handler, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + "apds9960_event", + indio_dev); + if (ret) { + dev_err(&client->dev, "request irq (%d) failed\n", client->irq); + goto error_power_down; + } + + ret = iio_device_register(indio_dev); + if (ret) + goto error_power_down; + + apds9960_set_power_state(data, false); + + return 0; + +error_power_down: + apds9960_set_power_state(data, false); + + return ret; +} + +static int apds9960_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct apds9960_data *data = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + apds9960_set_powermode(data, 0); + + return 0; +} + +#ifdef CONFIG_PM +static int apds9960_runtime_suspend(struct device *dev) +{ + struct apds9960_data *data = + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + return apds9960_set_powermode(data, 0); +} + +static int apds9960_runtime_resume(struct device *dev) +{ + struct apds9960_data *data = + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + return apds9960_set_powermode(data, 1); +} +#endif + +static const struct dev_pm_ops apds9960_pm_ops = { + SET_RUNTIME_PM_OPS(apds9960_runtime_suspend, + apds9960_runtime_resume, NULL) +}; + +static const struct i2c_device_id apds9960_id[] = { + { "apds9960", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, apds9960_id); + +static struct i2c_driver apds9960_driver = { + .driver = { + .name = APDS9960_DRV_NAME, + .pm = &apds9960_pm_ops, + }, + .probe = apds9960_probe, + .remove = apds9960_remove, + .id_table = apds9960_id, +}; +module_i2c_driver(apds9960_driver); + +MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>"); +MODULE_DESCRIPTION("ADPS9960 Gesture/RGB/ALS/Proximity sensor"); +MODULE_LICENSE("GPL"); |