| /* |
| * A iio driver for the light sensor ISL 29018. |
| * |
| * IIO driver for monitoring ambient light intensity in luxi, proximity |
| * sensing and infrared sensing. |
| * |
| * Copyright (c) 2010, NVIDIA Corporation. |
| * |
| * 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. |
| * |
| * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| #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 "../iio.h" |
| #include "../sysfs.h" |
| #define CONVERSION_TIME_MS 100 |
| |
| #define ISL29018_REG_ADD_COMMAND1 0x00 |
| #define COMMMAND1_OPMODE_SHIFT 5 |
| #define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT) |
| #define COMMMAND1_OPMODE_POWER_DOWN 0 |
| #define COMMMAND1_OPMODE_ALS_ONCE 1 |
| #define COMMMAND1_OPMODE_IR_ONCE 2 |
| #define COMMMAND1_OPMODE_PROX_ONCE 3 |
| |
| #define ISL29018_REG_ADD_COMMANDII 0x01 |
| #define COMMANDII_RESOLUTION_SHIFT 2 |
| #define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT) |
| |
| #define COMMANDII_RANGE_SHIFT 0 |
| #define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT) |
| |
| #define COMMANDII_SCHEME_SHIFT 7 |
| #define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT) |
| |
| #define ISL29018_REG_ADD_DATA_LSB 0x02 |
| #define ISL29018_REG_ADD_DATA_MSB 0x03 |
| #define ISL29018_MAX_REGS (ISL29018_REG_ADD_DATA_MSB+1) |
| |
| #define ISL29018_REG_TEST 0x08 |
| #define ISL29018_TEST_SHIFT 0 |
| #define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT) |
| |
| struct isl29018_chip { |
| struct i2c_client *client; |
| struct mutex lock; |
| unsigned int lux_scale; |
| unsigned int range; |
| unsigned int adc_bit; |
| int prox_scheme; |
| u8 reg_cache[ISL29018_MAX_REGS]; |
| }; |
| |
| static int isl29018_write_data(struct i2c_client *client, u8 reg, |
| u8 val, u8 mask, u8 shift) |
| { |
| u8 regval = val; |
| int ret; |
| struct isl29018_chip *chip = iio_priv(i2c_get_clientdata(client)); |
| |
| /* don't cache or mask REG_TEST */ |
| if (reg < ISL29018_MAX_REGS) { |
| regval = chip->reg_cache[reg]; |
| regval &= ~mask; |
| regval |= val << shift; |
| } |
| |
| ret = i2c_smbus_write_byte_data(client, reg, regval); |
| if (ret) { |
| dev_err(&client->dev, "Write to device fails status %x\n", ret); |
| } else { |
| /* don't update cache on err */ |
| if (reg < ISL29018_MAX_REGS) |
| chip->reg_cache[reg] = regval; |
| } |
| |
| return ret; |
| } |
| |
| static int isl29018_set_range(struct i2c_client *client, unsigned long range, |
| unsigned int *new_range) |
| { |
| static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000}; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) { |
| if (range <= supp_ranges[i]) { |
| *new_range = (unsigned int)supp_ranges[i]; |
| break; |
| } |
| } |
| |
| if (i >= ARRAY_SIZE(supp_ranges)) |
| return -EINVAL; |
| |
| return isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII, |
| i, COMMANDII_RANGE_MASK, COMMANDII_RANGE_SHIFT); |
| } |
| |
| static int isl29018_set_resolution(struct i2c_client *client, |
| unsigned long adcbit, unsigned int *conf_adc_bit) |
| { |
| static const unsigned long supp_adcbit[] = {16, 12, 8, 4}; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) { |
| if (adcbit >= supp_adcbit[i]) { |
| *conf_adc_bit = (unsigned int)supp_adcbit[i]; |
| break; |
| } |
| } |
| |
| if (i >= ARRAY_SIZE(supp_adcbit)) |
| return -EINVAL; |
| |
| return isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII, |
| i, COMMANDII_RESOLUTION_MASK, |
| COMMANDII_RESOLUTION_SHIFT); |
| } |
| |
| static int isl29018_read_sensor_input(struct i2c_client *client, int mode) |
| { |
| int status; |
| int lsb; |
| int msb; |
| |
| /* Set mode */ |
| status = isl29018_write_data(client, ISL29018_REG_ADD_COMMAND1, |
| mode, COMMMAND1_OPMODE_MASK, COMMMAND1_OPMODE_SHIFT); |
| if (status) { |
| dev_err(&client->dev, "Error in setting operating mode\n"); |
| return status; |
| } |
| msleep(CONVERSION_TIME_MS); |
| lsb = i2c_smbus_read_byte_data(client, ISL29018_REG_ADD_DATA_LSB); |
| if (lsb < 0) { |
| dev_err(&client->dev, "Error in reading LSB DATA\n"); |
| return lsb; |
| } |
| |
| msb = i2c_smbus_read_byte_data(client, ISL29018_REG_ADD_DATA_MSB); |
| if (msb < 0) { |
| dev_err(&client->dev, "Error in reading MSB DATA\n"); |
| return msb; |
| } |
| dev_vdbg(&client->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb); |
| |
| return (msb << 8) | lsb; |
| } |
| |
| static int isl29018_read_lux(struct i2c_client *client, int *lux) |
| { |
| int lux_data; |
| struct isl29018_chip *chip = iio_priv(i2c_get_clientdata(client)); |
| |
| lux_data = isl29018_read_sensor_input(client, |
| COMMMAND1_OPMODE_ALS_ONCE); |
| |
| if (lux_data < 0) |
| return lux_data; |
| |
| *lux = (lux_data * chip->range * chip->lux_scale) >> chip->adc_bit; |
| |
| return 0; |
| } |
| |
| static int isl29018_read_ir(struct i2c_client *client, int *ir) |
| { |
| int ir_data; |
| |
| ir_data = isl29018_read_sensor_input(client, COMMMAND1_OPMODE_IR_ONCE); |
| |
| if (ir_data < 0) |
| return ir_data; |
| |
| *ir = ir_data; |
| |
| return 0; |
| } |
| |
| static int isl29018_read_proximity_ir(struct i2c_client *client, int scheme, |
| int *near_ir) |
| { |
| int status; |
| int prox_data = -1; |
| int ir_data = -1; |
| |
| /* Do proximity sensing with required scheme */ |
| status = isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII, |
| scheme, COMMANDII_SCHEME_MASK, COMMANDII_SCHEME_SHIFT); |
| if (status) { |
| dev_err(&client->dev, "Error in setting operating mode\n"); |
| return status; |
| } |
| |
| prox_data = isl29018_read_sensor_input(client, |
| COMMMAND1_OPMODE_PROX_ONCE); |
| if (prox_data < 0) |
| return prox_data; |
| |
| if (scheme == 1) { |
| *near_ir = prox_data; |
| return 0; |
| } |
| |
| ir_data = isl29018_read_sensor_input(client, |
| COMMMAND1_OPMODE_IR_ONCE); |
| |
| if (ir_data < 0) |
| return ir_data; |
| |
| if (prox_data >= ir_data) |
| *near_ir = prox_data - ir_data; |
| else |
| *near_ir = 0; |
| |
| return 0; |
| } |
| |
| /* Sysfs interface */ |
| /* range */ |
| static ssize_t show_range(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%u\n", chip->range); |
| } |
| |
| static ssize_t store_range(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| struct i2c_client *client = chip->client; |
| int status; |
| unsigned long lval; |
| unsigned int new_range; |
| |
| if (strict_strtoul(buf, 10, &lval)) |
| return -EINVAL; |
| |
| if (!(lval == 1000UL || lval == 4000UL || |
| lval == 16000UL || lval == 64000UL)) { |
| dev_err(dev, "The range is not supported\n"); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&chip->lock); |
| status = isl29018_set_range(client, lval, &new_range); |
| if (status < 0) { |
| mutex_unlock(&chip->lock); |
| dev_err(dev, "Error in setting max range\n"); |
| return status; |
| } |
| chip->range = new_range; |
| mutex_unlock(&chip->lock); |
| |
| return count; |
| } |
| |
| /* resolution */ |
| static ssize_t show_resolution(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%u\n", chip->adc_bit); |
| } |
| |
| static ssize_t store_resolution(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| struct i2c_client *client = chip->client; |
| int status; |
| unsigned long lval; |
| unsigned int new_adc_bit; |
| |
| if (strict_strtoul(buf, 10, &lval)) |
| return -EINVAL; |
| if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) { |
| dev_err(dev, "The resolution is not supported\n"); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&chip->lock); |
| status = isl29018_set_resolution(client, lval, &new_adc_bit); |
| if (status < 0) { |
| mutex_unlock(&chip->lock); |
| dev_err(dev, "Error in setting resolution\n"); |
| return status; |
| } |
| chip->adc_bit = new_adc_bit; |
| mutex_unlock(&chip->lock); |
| |
| return count; |
| } |
| |
| /* proximity scheme */ |
| static ssize_t show_prox_infrared_supression(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| |
| /* return the "proximity scheme" i.e. if the chip does on chip |
| infrared supression (1 means perform on chip supression) */ |
| return sprintf(buf, "%d\n", chip->prox_scheme); |
| } |
| |
| static ssize_t store_prox_infrared_supression(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| unsigned long lval; |
| |
| if (strict_strtoul(buf, 10, &lval)) |
| return -EINVAL; |
| if (!(lval == 0UL || lval == 1UL)) { |
| dev_err(dev, "The mode is not supported\n"); |
| return -EINVAL; |
| } |
| |
| /* get the "proximity scheme" i.e. if the chip does on chip |
| infrared supression (1 means perform on chip supression) */ |
| mutex_lock(&chip->lock); |
| chip->prox_scheme = (int)lval; |
| mutex_unlock(&chip->lock); |
| |
| return count; |
| } |
| |
| /* Channel IO */ |
| static int isl29018_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| int ret = -EINVAL; |
| |
| mutex_lock(&chip->lock); |
| if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) { |
| chip->lux_scale = val; |
| ret = 0; |
| } |
| mutex_unlock(&chip->lock); |
| |
| return 0; |
| } |
| |
| static int isl29018_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long mask) |
| { |
| int ret = -EINVAL; |
| struct isl29018_chip *chip = iio_priv(indio_dev); |
| struct i2c_client *client = chip->client; |
| |
| mutex_lock(&chip->lock); |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| case IIO_CHAN_INFO_PROCESSED: |
| switch (chan->type) { |
| case IIO_LIGHT: |
| ret = isl29018_read_lux(client, val); |
| break; |
| case IIO_INTENSITY: |
| ret = isl29018_read_ir(client, val); |
| break; |
| case IIO_PROXIMITY: |
| ret = isl29018_read_proximity_ir(client, |
| chip->prox_scheme, val); |
| break; |
| default: |
| break; |
| } |
| if (!ret) |
| ret = IIO_VAL_INT; |
| break; |
| case IIO_CHAN_INFO_CALIBSCALE: |
| if (chan->type == IIO_LIGHT) { |
| *val = chip->lux_scale; |
| ret = IIO_VAL_INT; |
| } |
| break; |
| default: |
| break; |
| } |
| mutex_unlock(&chip->lock); |
| return ret; |
| } |
| |
| static const struct iio_chan_spec isl29018_channels[] = { |
| { |
| .type = IIO_LIGHT, |
| .indexed = 1, |
| .channel = 0, |
| .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT | |
| IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT, |
| }, { |
| .type = IIO_INTENSITY, |
| .modified = 1, |
| .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
| .channel2 = IIO_MOD_LIGHT_IR, |
| }, { |
| /* Unindexed in current ABI. But perhaps it should be. */ |
| .type = IIO_PROXIMITY, |
| .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
| } |
| }; |
| |
| static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0); |
| static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000"); |
| static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16"); |
| static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR, |
| show_resolution, store_resolution, 0); |
| static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_supression, |
| S_IRUGO | S_IWUSR, |
| show_prox_infrared_supression, |
| store_prox_infrared_supression, 0); |
| |
| #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) |
| #define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) |
| static struct attribute *isl29018_attributes[] = { |
| ISL29018_DEV_ATTR(range), |
| ISL29018_CONST_ATTR(range_available), |
| ISL29018_DEV_ATTR(adc_resolution), |
| ISL29018_CONST_ATTR(adc_resolution_available), |
| ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_supression), |
| NULL |
| }; |
| |
| static const struct attribute_group isl29108_group = { |
| .attrs = isl29018_attributes, |
| }; |
| |
| static int isl29018_chip_init(struct i2c_client *client) |
| { |
| struct isl29018_chip *chip = iio_priv(i2c_get_clientdata(client)); |
| int status; |
| int new_adc_bit; |
| unsigned int new_range; |
| |
| memset(chip->reg_cache, 0, sizeof(chip->reg_cache)); |
| |
| /* Code added per Intersil Application Note 1534: |
| * When VDD sinks to approximately 1.8V or below, some of |
| * the part's registers may change their state. When VDD |
| * recovers to 2.25V (or greater), the part may thus be in an |
| * unknown mode of operation. The user can return the part to |
| * a known mode of operation either by (a) setting VDD = 0V for |
| * 1 second or more and then powering back up with a slew rate |
| * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX |
| * conversions, clear the test registers, and then rewrite all |
| * registers to the desired values. |
| * ... |
| * FOR ISL29011, ISL29018, ISL29021, ISL29023 |
| * 1. Write 0x00 to register 0x08 (TEST) |
| * 2. Write 0x00 to register 0x00 (CMD1) |
| * 3. Rewrite all registers to the desired values |
| * |
| * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says |
| * the same thing EXCEPT the data sheet asks for a 1ms delay after |
| * writing the CMD1 register. |
| */ |
| status = isl29018_write_data(client, ISL29018_REG_TEST, 0, |
| ISL29018_TEST_MASK, ISL29018_TEST_SHIFT); |
| if (status < 0) { |
| dev_err(&client->dev, "Failed to clear isl29018 TEST reg." |
| "(%d)\n", status); |
| return status; |
| } |
| |
| /* See Intersil AN1534 comments above. |
| * "Operating Mode" (COMMAND1) register is reprogrammed when |
| * data is read from the device. |
| */ |
| status = isl29018_write_data(client, ISL29018_REG_ADD_COMMAND1, 0, |
| 0xff, 0); |
| if (status < 0) { |
| dev_err(&client->dev, "Failed to clear isl29018 CMD1 reg." |
| "(%d)\n", status); |
| return status; |
| } |
| |
| msleep(1); /* per data sheet, page 10 */ |
| |
| /* set defaults */ |
| status = isl29018_set_range(client, chip->range, &new_range); |
| if (status < 0) { |
| dev_err(&client->dev, "Init of isl29018 fails\n"); |
| return status; |
| } |
| |
| status = isl29018_set_resolution(client, chip->adc_bit, |
| &new_adc_bit); |
| |
| return 0; |
| } |
| |
| static const struct iio_info isl29108_info = { |
| .attrs = &isl29108_group, |
| .driver_module = THIS_MODULE, |
| .read_raw = &isl29018_read_raw, |
| .write_raw = &isl29018_write_raw, |
| }; |
| |
| static int __devinit isl29018_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct isl29018_chip *chip; |
| struct iio_dev *indio_dev; |
| int err; |
| |
| indio_dev = iio_allocate_device(sizeof(*chip)); |
| if (indio_dev == NULL) { |
| dev_err(&client->dev, "iio allocation fails\n"); |
| err = -ENOMEM; |
| goto exit; |
| } |
| chip = iio_priv(indio_dev); |
| |
| i2c_set_clientdata(client, indio_dev); |
| chip->client = client; |
| |
| mutex_init(&chip->lock); |
| |
| chip->lux_scale = 1; |
| chip->range = 1000; |
| chip->adc_bit = 16; |
| |
| err = isl29018_chip_init(client); |
| if (err) |
| goto exit_iio_free; |
| |
| indio_dev->info = &isl29108_info; |
| indio_dev->channels = isl29018_channels; |
| indio_dev->num_channels = ARRAY_SIZE(isl29018_channels); |
| indio_dev->name = id->name; |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| err = iio_device_register(indio_dev); |
| if (err) { |
| dev_err(&client->dev, "iio registration fails\n"); |
| goto exit_iio_free; |
| } |
| |
| return 0; |
| exit_iio_free: |
| iio_free_device(indio_dev); |
| exit: |
| return err; |
| } |
| |
| static int __devexit isl29018_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| |
| dev_dbg(&client->dev, "%s()\n", __func__); |
| iio_device_unregister(indio_dev); |
| iio_free_device(indio_dev); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id isl29018_id[] = { |
| {"isl29018", 0}, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, isl29018_id); |
| |
| static const struct of_device_id isl29018_of_match[] = { |
| { .compatible = "invn,isl29018", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, isl29018_of_match); |
| |
| static struct i2c_driver isl29018_driver = { |
| .class = I2C_CLASS_HWMON, |
| .driver = { |
| .name = "isl29018", |
| .owner = THIS_MODULE, |
| .of_match_table = isl29018_of_match, |
| }, |
| .probe = isl29018_probe, |
| .remove = __devexit_p(isl29018_remove), |
| .id_table = isl29018_id, |
| }; |
| module_i2c_driver(isl29018_driver); |
| |
| MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver"); |
| MODULE_LICENSE("GPL"); |