123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552 |
- /*
- * 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 = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
- if (ret < 0) {
- dev_err(chip->dev, "iio registration fails with error %d\n",
- ret);
- return ret;
- }
- 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",
- .of_match_table = isl29028_of_match,
- },
- .probe = isl29028_probe,
- .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>");
|