| /* |
| * IIO driver for the light sensor ISL29028. |
| * ISL29028 is Concurrent Ambient Light and Proximity Sensor |
| * |
| * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/err.h> |
| #include <linux/mutex.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/regmap.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #define CONVERSION_TIME_MS 100 |
| |
| #define ISL29028_REG_CONFIGURE 0x01 |
| |
| #define CONFIGURE_ALS_IR_MODE_ALS 0 |
| #define CONFIGURE_ALS_IR_MODE_IR BIT(0) |
| #define CONFIGURE_ALS_IR_MODE_MASK BIT(0) |
| |
| #define CONFIGURE_ALS_RANGE_LOW_LUX 0 |
| #define CONFIGURE_ALS_RANGE_HIGH_LUX BIT(1) |
| #define CONFIGURE_ALS_RANGE_MASK BIT(1) |
| |
| #define CONFIGURE_ALS_DIS 0 |
| #define CONFIGURE_ALS_EN BIT(2) |
| #define CONFIGURE_ALS_EN_MASK BIT(2) |
| |
| #define CONFIGURE_PROX_DRIVE BIT(3) |
| |
| #define CONFIGURE_PROX_SLP_SH 4 |
| #define CONFIGURE_PROX_SLP_MASK (7 << CONFIGURE_PROX_SLP_SH) |
| |
| #define CONFIGURE_PROX_EN BIT(7) |
| #define CONFIGURE_PROX_EN_MASK BIT(7) |
| |
| #define ISL29028_REG_INTERRUPT 0x02 |
| |
| #define ISL29028_REG_PROX_DATA 0x08 |
| #define ISL29028_REG_ALSIR_L 0x09 |
| #define ISL29028_REG_ALSIR_U 0x0A |
| |
| #define ISL29028_REG_TEST1_MODE 0x0E |
| #define ISL29028_REG_TEST2_MODE 0x0F |
| |
| #define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1) |
| |
| enum als_ir_mode { |
| MODE_NONE = 0, |
| MODE_ALS, |
| MODE_IR |
| }; |
| |
| struct isl29028_chip { |
| struct device *dev; |
| struct mutex lock; |
| struct regmap *regmap; |
| |
| unsigned int prox_sampling; |
| bool enable_prox; |
| |
| int lux_scale; |
| int als_ir_mode; |
| }; |
| |
| static int isl29028_set_proxim_sampling(struct isl29028_chip *chip, |
| unsigned int sampling) |
| { |
| static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0}; |
| int sel; |
| unsigned int period = DIV_ROUND_UP(1000, sampling); |
| |
| for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) { |
| if (period >= prox_period[sel]) |
| break; |
| } |
| return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_PROX_SLP_MASK, sel << CONFIGURE_PROX_SLP_SH); |
| } |
| |
| static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable) |
| { |
| int ret; |
| int val = 0; |
| |
| if (enable) |
| val = CONFIGURE_PROX_EN; |
| ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_PROX_EN_MASK, val); |
| if (ret < 0) |
| return ret; |
| |
| /* Wait for conversion to be complete for first sample */ |
| mdelay(DIV_ROUND_UP(1000, chip->prox_sampling)); |
| return 0; |
| } |
| |
| static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale) |
| { |
| int val = (lux_scale == 2000) ? CONFIGURE_ALS_RANGE_HIGH_LUX : |
| CONFIGURE_ALS_RANGE_LOW_LUX; |
| |
| return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_RANGE_MASK, val); |
| } |
| |
| static int isl29028_set_als_ir_mode(struct isl29028_chip *chip, |
| enum als_ir_mode mode) |
| { |
| int ret = 0; |
| |
| switch (mode) { |
| case MODE_ALS: |
| ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_ALS); |
| if (ret < 0) |
| return ret; |
| |
| ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_RANGE_MASK, CONFIGURE_ALS_RANGE_HIGH_LUX); |
| break; |
| |
| case MODE_IR: |
| ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_IR); |
| break; |
| |
| case MODE_NONE: |
| return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_DIS); |
| } |
| |
| if (ret < 0) |
| return ret; |
| |
| /* Enable the ALS/IR */ |
| ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, |
| CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_EN); |
| if (ret < 0) |
| return ret; |
| |
| /* Need to wait for conversion time if ALS/IR mode enabled */ |
| mdelay(CONVERSION_TIME_MS); |
| return 0; |
| } |
| |
| static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir) |
| { |
| unsigned int lsb; |
| unsigned int msb; |
| int ret; |
| |
| ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Error in reading register ALSIR_L err %d\n", ret); |
| return ret; |
| } |
| |
| ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Error in reading register ALSIR_U err %d\n", ret); |
| return ret; |
| } |
| |
| *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF); |
| return 0; |
| } |
| |
| static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox) |
| { |
| unsigned int data; |
| int ret; |
| |
| ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data); |
| if (ret < 0) { |
| dev_err(chip->dev, "Error in reading register %d, error %d\n", |
| ISL29028_REG_PROX_DATA, ret); |
| return ret; |
| } |
| *prox = data; |
| return 0; |
| } |
| |
| static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data) |
| { |
| int ret; |
| |
| if (!chip->enable_prox) { |
| ret = isl29028_enable_proximity(chip, true); |
| if (ret < 0) |
| return ret; |
| chip->enable_prox = true; |
| } |
| return isl29028_read_proxim(chip, prox_data); |
| } |
| |
| static int isl29028_als_get(struct isl29028_chip *chip, int *als_data) |
| { |
| int ret; |
| int als_ir_data; |
| |
| if (chip->als_ir_mode != MODE_ALS) { |
| ret = isl29028_set_als_ir_mode(chip, MODE_ALS); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Error in enabling ALS mode err %d\n", ret); |
| return ret; |
| } |
| chip->als_ir_mode = MODE_ALS; |
| } |
| |
| ret = isl29028_read_als_ir(chip, &als_ir_data); |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * convert als data count to lux. |
| * if lux_scale = 125, lux = count * 0.031 |
| * if lux_scale = 2000, lux = count * 0.49 |
| */ |
| if (chip->lux_scale == 125) |
| als_ir_data = (als_ir_data * 31) / 1000; |
| else |
| als_ir_data = (als_ir_data * 49) / 100; |
| |
| *als_data = als_ir_data; |
| return 0; |
| } |
| |
| static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data) |
| { |
| int ret; |
| |
| if (chip->als_ir_mode != MODE_IR) { |
| ret = isl29028_set_als_ir_mode(chip, MODE_IR); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Error in enabling IR mode err %d\n", ret); |
| return ret; |
| } |
| chip->als_ir_mode = MODE_IR; |
| } |
| return isl29028_read_als_ir(chip, ir_data); |
| } |
| |
| /* Channel IO */ |
| static int isl29028_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, int val, int val2, long mask) |
| { |
| struct isl29028_chip *chip = iio_priv(indio_dev); |
| int ret = -EINVAL; |
| |
| mutex_lock(&chip->lock); |
| switch (chan->type) { |
| case IIO_PROXIMITY: |
| if (mask != IIO_CHAN_INFO_SAMP_FREQ) { |
| dev_err(chip->dev, |
| "proximity: mask value 0x%08lx not supported\n", |
| mask); |
| break; |
| } |
| if (val < 1 || val > 100) { |
| dev_err(chip->dev, |
| "Samp_freq %d is not in range[1:100]\n", val); |
| break; |
| } |
| ret = isl29028_set_proxim_sampling(chip, val); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Setting proximity samp_freq fail, err %d\n", |
| ret); |
| break; |
| } |
| chip->prox_sampling = val; |
| break; |
| |
| case IIO_LIGHT: |
| if (mask != IIO_CHAN_INFO_SCALE) { |
| dev_err(chip->dev, |
| "light: mask value 0x%08lx not supported\n", |
| mask); |
| break; |
| } |
| if ((val != 125) && (val != 2000)) { |
| dev_err(chip->dev, |
| "lux scale %d is invalid [125, 2000]\n", val); |
| break; |
| } |
| ret = isl29028_set_als_scale(chip, val); |
| if (ret < 0) { |
| dev_err(chip->dev, |
| "Setting lux scale fail with error %d\n", ret); |
| break; |
| } |
| chip->lux_scale = val; |
| break; |
| |
| default: |
| dev_err(chip->dev, "Unsupported channel type\n"); |
| break; |
| } |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static int isl29028_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, int *val, int *val2, long mask) |
| { |
| struct isl29028_chip *chip = iio_priv(indio_dev); |
| int ret = -EINVAL; |
| |
| mutex_lock(&chip->lock); |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| case IIO_CHAN_INFO_PROCESSED: |
| switch (chan->type) { |
| case IIO_LIGHT: |
| ret = isl29028_als_get(chip, val); |
| break; |
| case IIO_INTENSITY: |
| ret = isl29028_ir_get(chip, val); |
| break; |
| case IIO_PROXIMITY: |
| ret = isl29028_proxim_get(chip, val); |
| break; |
| default: |
| break; |
| } |
| if (ret < 0) |
| break; |
| ret = IIO_VAL_INT; |
| break; |
| |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| if (chan->type != IIO_PROXIMITY) |
| break; |
| *val = chip->prox_sampling; |
| ret = IIO_VAL_INT; |
| break; |
| |
| case IIO_CHAN_INFO_SCALE: |
| if (chan->type != IIO_LIGHT) |
| break; |
| *val = chip->lux_scale; |
| ret = IIO_VAL_INT; |
| break; |
| |
| default: |
| dev_err(chip->dev, "mask value 0x%08lx not supported\n", mask); |
| break; |
| } |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static IIO_CONST_ATTR(in_proximity_sampling_frequency_available, |
| "1, 3, 5, 10, 13, 20, 83, 100"); |
| static IIO_CONST_ATTR(in_illuminance_scale_available, "125, 2000"); |
| |
| #define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) |
| #define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) |
| static struct attribute *isl29028_attributes[] = { |
| ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available), |
| ISL29028_CONST_ATTR(in_illuminance_scale_available), |
| NULL, |
| }; |
| |
| static const struct attribute_group isl29108_group = { |
| .attrs = isl29028_attributes, |
| }; |
| |
| static const struct iio_chan_spec isl29028_channels[] = { |
| { |
| .type = IIO_LIGHT, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| BIT(IIO_CHAN_INFO_SCALE), |
| }, { |
| .type = IIO_INTENSITY, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
| }, { |
| .type = IIO_PROXIMITY, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
| BIT(IIO_CHAN_INFO_SAMP_FREQ), |
| } |
| }; |
| |
| static const struct iio_info isl29028_info = { |
| .attrs = &isl29108_group, |
| .driver_module = THIS_MODULE, |
| .read_raw = &isl29028_read_raw, |
| .write_raw = &isl29028_write_raw, |
| }; |
| |
| static int isl29028_chip_init(struct isl29028_chip *chip) |
| { |
| int ret; |
| |
| chip->enable_prox = false; |
| chip->prox_sampling = 20; |
| chip->lux_scale = 2000; |
| chip->als_ir_mode = MODE_NONE; |
| |
| ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0); |
| if (ret < 0) { |
| dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", |
| __func__, ISL29028_REG_TEST1_MODE, ret); |
| return ret; |
| } |
| ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0); |
| if (ret < 0) { |
| dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", |
| __func__, ISL29028_REG_TEST2_MODE, ret); |
| return ret; |
| } |
| |
| ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0); |
| if (ret < 0) { |
| dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", |
| __func__, ISL29028_REG_CONFIGURE, ret); |
| return ret; |
| } |
| |
| ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling); |
| if (ret < 0) { |
| dev_err(chip->dev, "setting the proximity, err = %d\n", |
| ret); |
| return ret; |
| } |
| |
| ret = isl29028_set_als_scale(chip, chip->lux_scale); |
| if (ret < 0) |
| dev_err(chip->dev, |
| "setting als scale failed, err = %d\n", ret); |
| return ret; |
| } |
| |
| static bool is_volatile_reg(struct device *dev, unsigned int reg) |
| { |
| switch (reg) { |
| case ISL29028_REG_INTERRUPT: |
| case ISL29028_REG_PROX_DATA: |
| case ISL29028_REG_ALSIR_L: |
| case ISL29028_REG_ALSIR_U: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static const struct regmap_config isl29028_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .volatile_reg = is_volatile_reg, |
| .max_register = ISL29028_NUM_REGS - 1, |
| .num_reg_defaults_raw = ISL29028_NUM_REGS, |
| .cache_type = REGCACHE_RBTREE, |
| }; |
| |
| static int isl29028_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct isl29028_chip *chip; |
| struct iio_dev *indio_dev; |
| int ret; |
| |
| indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); |
| if (!indio_dev) { |
| dev_err(&client->dev, "iio allocation fails\n"); |
| return -ENOMEM; |
| } |
| |
| chip = iio_priv(indio_dev); |
| |
| i2c_set_clientdata(client, indio_dev); |
| chip->dev = &client->dev; |
| mutex_init(&chip->lock); |
| |
| chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config); |
| if (IS_ERR(chip->regmap)) { |
| ret = PTR_ERR(chip->regmap); |
| dev_err(chip->dev, "regmap initialization failed: %d\n", ret); |
| return ret; |
| } |
| |
| ret = isl29028_chip_init(chip); |
| if (ret < 0) { |
| dev_err(chip->dev, "chip initialization failed: %d\n", ret); |
| return ret; |
| } |
| |
| indio_dev->info = &isl29028_info; |
| indio_dev->channels = isl29028_channels; |
| indio_dev->num_channels = ARRAY_SIZE(isl29028_channels); |
| indio_dev->name = id->name; |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| ret = iio_device_register(indio_dev); |
| if (ret < 0) { |
| dev_err(chip->dev, "iio registration fails with error %d\n", |
| ret); |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int isl29028_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| |
| iio_device_unregister(indio_dev); |
| return 0; |
| } |
| |
| static const struct i2c_device_id isl29028_id[] = { |
| {"isl29028", 0}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, isl29028_id); |
| |
| static const struct of_device_id isl29028_of_match[] = { |
| { .compatible = "isl,isl29028", }, /* for backward compat., don't use */ |
| { .compatible = "isil,isl29028", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, isl29028_of_match); |
| |
| static struct i2c_driver isl29028_driver = { |
| .class = I2C_CLASS_HWMON, |
| .driver = { |
| .name = "isl29028", |
| .owner = THIS_MODULE, |
| .of_match_table = isl29028_of_match, |
| }, |
| .probe = isl29028_probe, |
| .remove = isl29028_remove, |
| .id_table = isl29028_id, |
| }; |
| |
| module_i2c_driver(isl29028_driver); |
| |
| MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); |