This patch adds a driver for Intersil's ISL29003 ambient light sensor device plus some documentation. Inspired by tsl2550.c, a driver for a similar device.
Signed-off-by: Daniel Mack <[email protected]> --- Documentation/i2c/chips/isl29003 | 62 +++++ drivers/i2c/chips/Kconfig | 10 + drivers/i2c/chips/Makefile | 1 + drivers/i2c/chips/isl29003.c | 517 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 590 insertions(+), 0 deletions(-) create mode 100644 Documentation/i2c/chips/isl29003 create mode 100644 drivers/i2c/chips/isl29003.c diff --git a/Documentation/i2c/chips/isl29003 b/Documentation/i2c/chips/isl29003 new file mode 100644 index 0000000..f808141 --- /dev/null +++ b/Documentation/i2c/chips/isl29003 @@ -0,0 +1,62 @@ +Kernel driver isl29003 +===================== + +Supported chips: +* Intersil ISL29003 +Prefix: 'isl29003' +Addresses scanned: none +Datasheet: +http://www.intersil.com&data/fn/fn7464.pdf + +Author: Daniel Mack <[email protected]> + + +Description +----------- +The ISL29003 is an integrated light sensors with a 16-bit integrating type +ADC, I2C user programmable lux range select for optimized counts/lux, and +I2C multi-function control and monitoring capabilities. The internal ADC +provides 16-bit resolution while rejecting 50Hz and 60Hz flicker caused by +artificial light sources. + +The driver allows to set the lux range, the bit resolution, the operational +mode (see below) and the power state of device and can read the current lux +value, of course. + + +Detection +--------- + +The ISL29003 does not have an ID register which could be used to identify +it, so the detection routing will just try to read from the configured I2C +addess and consider the device to be present as soon as it ACKs the +transfer. + + +Sysfs entries +------------- + +range: + 0: 0 lux to 1000 lux (default) + 1: 0 lux to 4000 lux + 2: 0 lux to 16,000 lux + 3: 0 lux to 64,000 lux + +resolution: + 0: 2^16 cycles (default) + 1: 2^12 cycles + 2: 2^8 cycles + 3: 2^4 cycles + +mode: + 0: diode1's current (unsigned 16bit) (default) + 1: diode1's current (unsigned 16bit) + 2: difference between diodes (l1 - l2, signed 15bit) + +power_state: + 0: device is disabled (default) + 1: device is enabled + +value (read only): + returns the value from the last sensor reading + diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index c80312c..d10f515 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -102,4 +102,14 @@ config SENSORS_TSL2550 This driver can also be built as a module. If so, the module will be called tsl2550. +config SENSORS_ISL29003 + tristate "Intersil ISL29003 ambient light sensor" + depends on EXPERIMENTAL + help + If you say yes here you get support for the Intersil ISL29003 + ambient light sensor. + + This driver can also be built as a module. If so, the module + will be called isl29003. + endmenu diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index d142f23..c94c8a6 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_PCF8575) += pcf8575.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o +obj-$(CONFIG_SENSORS_ISL29003) += isl29003.o ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) EXTRA_CFLAGS += -DDEBUG diff --git a/drivers/i2c/chips/isl29003.c b/drivers/i2c/chips/isl29003.c new file mode 100644 index 0000000..757a74f --- /dev/null +++ b/drivers/i2c/chips/isl29003.c @@ -0,0 +1,517 @@ +/* + * isl29003.c - Linux kernel modules for + * Intersil ISL29003 ambient light sensor + * + * See file://Documentation/i2c/chips/isl29003 + * + * Copyright (c) 2009 Daniel Mack <[email protected]> + * + * Based on code written by + * Rodolfo Giometti <[email protected]> + * Eurotech S.p.A. <[email protected]> + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/mutex.h> +#include <linux/delay.h> + +#define ISL29003_DRV_NAME "isl29003" +#define DRIVER_VERSION "1.0" + +#define ISL29003_REG_COMMAND 0x00 +#define ISL29003_ADC_ENABLED (1 << 7) +#define ISL29003_ADC_PD (1 << 6) +#define ISL29003_TIMING_INT (1 << 5) +#define ISL29003_MODE_SHIFT (2) +#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT) +#define ISL29003_RES_SHIFT (0) +#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT) + +#define ISL29003_REG_CONTROL 0x01 +#define ISL29003_INT_FLG (1 << 5) +#define ISL29003_RANGE_SHIFT (2) +#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT) +#define ISL29003_INT_PERSISTS_SHIFT (0) +#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT) + +#define ISL29003_REG_IRQ_THRESH_HI 0x02 +#define ISL29003_REG_IRQ_THRESH_LO 0x03 +#define ISL29003_REG_LSB_SENSOR 0x04 +#define ISL29003_REG_MSB_SENSOR 0x05 +#define ISL29003_REG_LSB_TIMER 0x06 +#define ISL29003_REG_MSB_TIMER 0x07 + +struct isl29003_data { + struct i2c_client *client; + struct mutex update_lock; + u8 reg_cache[8]; +}; + +static int gain_range[4] = { + 1000, 4000, 16000, 64000 +}; + +/* + * register access helpers + */ + +static int __isl29003_read_reg(struct i2c_client *client, + u32 reg, u8 mask, u8 shift) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + return (data->reg_cache[reg] & mask) >> shift; +} + +static int __isl29003_write_reg(struct i2c_client *client, + u32 reg, u8 mask, u8 shift, u8 val) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + u8 tmp = data->reg_cache[reg]; + int ret; + + tmp &= ~mask; + tmp |= val << shift; + + ret = i2c_smbus_write_byte_data(client, reg, tmp); + if (ret < 0) + return ret; + + data->reg_cache[reg] = tmp; + return 0; +} + +/* + * internally used functions + */ + +/* range */ +static int isl29003_get_range(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_CONTROL, + ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT); +} + +static int isl29003_set_range(struct i2c_client *client, int range) +{ + return __isl29003_write_reg(client, ISL29003_REG_CONTROL, + ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range); +} + +/* resolution */ +static int isl29003_get_resolution(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT); +} + +static int isl29003_set_resolution(struct i2c_client *client, int range) +{ + return __isl29003_write_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT, range); +} + +/* mode */ +static int isl29003_get_mode(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT); +} + +static int isl29003_set_mode(struct i2c_client *client, int mode) +{ + return __isl29003_write_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT, mode); +} + +/* power_state */ +static int isl29003_set_power_state(struct i2c_client *client, int state) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + int ret; + u8 v = data->reg_cache[ISL29003_REG_COMMAND]; + + if (state == 0) { + v &= ~ISL29003_ADC_ENABLED; + v |= ISL29003_ADC_PD; + } else { + v |= ISL29003_ADC_ENABLED; + v &= ~ISL29003_ADC_PD; + } + + ret = i2c_smbus_write_byte_data(client, ISL29003_REG_COMMAND, v); + if (ret < 0) + return ret; + + data->reg_cache[ISL29003_REG_COMMAND] = v; + return 0; +} + +static int isl29003_get_power_state(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND]; + return (cmdreg & ISL29003_ADC_ENABLED) && (~cmdreg & ISL29003_ADC_PD); +} + +static unsigned int isl29003_get_adc_value(struct i2c_client *client) +{ + int lsb, msb, range, bitdepth; + + lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR); + if (lsb < 0) + return lsb; + + msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR); + if (msb < 0) + return msb; + + range = isl29003_get_range(client); + bitdepth = (4 - isl29003_get_resolution(client)) * 4; + return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth; +} + +/* + * sysfs layer + */ + +/* range */ +static ssize_t isl29003_show_range(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + return sprintf(buf, "%i\n", isl29003_get_range(client)); +} + +static ssize_t isl29003_store_range(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + unsigned long val; + int ret; + + if (strict_strtoul(buf, 10, &val) < 0) + return -EINVAL; + + if (val < 0 || val > 3) + return -EINVAL; + + if (!isl29003_get_power_state(client)) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = isl29003_set_range(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(range, S_IWUSR | S_IRUGO, + isl29003_show_range, isl29003_store_range); + + +/* resolution */ +static ssize_t isl29003_show_resolution(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + return sprintf(buf, "%i\n", isl29003_get_resolution(client)); +} + +static ssize_t isl29003_store_resolution(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + unsigned long val; + int ret; + + if (strict_strtoul(buf, 10, &val) < 0) + return -EINVAL; + + if (val < 0 || val > 3) + return -EINVAL; + + if (!isl29003_get_power_state(client)) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = isl29003_set_resolution(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO, + isl29003_show_resolution, isl29003_store_resolution); + +/* mode */ +static ssize_t isl29003_show_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + return sprintf(buf, "%i\n", isl29003_get_mode(client)); +} + +static ssize_t isl29003_store_mode(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + unsigned long val; + int ret; + + if (strict_strtoul(buf, 10, &val) < 0) + return -EINVAL; + + if (val < 0 || val > 2) + return -EINVAL; + + if (!isl29003_get_power_state(client)) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = isl29003_set_mode(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, + isl29003_show_mode, isl29003_store_mode); + + +/* power state */ +static ssize_t isl29003_show_power_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + return sprintf(buf, "%u\n", isl29003_get_power_state(client)); +} + +static ssize_t isl29003_store_power_state(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + unsigned long val; + int ret; + + if (strict_strtoul(buf, 10, &val) < 0) + return -EINVAL; + + if (val < 0 || val > 1) + return -EINVAL; + + mutex_lock(&data->update_lock); + ret = isl29003_set_power_state(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, + isl29003_show_power_state, isl29003_store_power_state); + + +static ssize_t isl29003_show_lux(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + int ret; + + /* No LUX data if not operational */ + if (!isl29003_get_power_state(client)) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = sprintf(buf, "%d\n", isl29003_get_adc_value(client)); + mutex_unlock(&data->update_lock); + + return ret; +} + +static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL); + +static struct attribute *isl29003_attributes[] = { + &dev_attr_range.attr, + &dev_attr_resolution.attr, + &dev_attr_mode.attr, + &dev_attr_power_state.attr, + &dev_attr_lux.attr, + NULL +}; + +static const struct attribute_group isl29003_attr_group = { + .attrs = isl29003_attributes, +}; + +static int isl29003_init_client(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + int i; + + /* read all the registers once to fill the cache. + * if a read fails, we consider the init failed */ + for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) { + int v = i2c_smbus_read_byte_data(client, i); + if (v < 0) + return -ENODEV; + data->reg_cache[i] = v; + } + + /* set defaults */ + isl29003_set_range(client, 0); + isl29003_set_resolution(client, 0); + isl29003_set_mode(client, 0); + isl29003_set_power_state(client, 0); + + return 0; +} + +/* + * I2C layer + */ + +static int __devinit isl29003_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct isl29003_data *data; + int err = 0; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) { + err = -EIO; + goto exit; + } + + data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + data->client = client; + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* initialize the ISL29003 chip */ + err = isl29003_init_client(client); + if (err) + goto exit_kfree; + + /* register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group); + if (err) + goto exit_kfree; + + dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION); + return 0; + +exit_kfree: + kfree(data); +exit: + return err; +} + +static int __devexit isl29003_remove(struct i2c_client *client) +{ + sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group); + isl29003_set_power_state(client, 0); + kfree(i2c_get_clientdata(client)); + return 0; +} + +#ifdef CONFIG_PM +static int isl29003_suspend(struct i2c_client *client, pm_message_t mesg) +{ + return isl29003_set_power_state(client, 0); +} + +static int isl29003_resume(struct i2c_client *client) +{ + int i; + + /* restore registers from cache */ + for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) + if (i2c_smbus_read_byte_data(client, i, data->reg_cache[i]) < 0) + return -ENODEV; + + return 0; +} + +#else +#define isl29003_suspend NULL +#define isl29003_resume NULL +#endif /* CONFIG_PM */ + +static const struct i2c_device_id isl29003_id[] = { + { "isl29003", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, isl29003_id); + +static struct i2c_driver isl29003_driver = { + .driver = { + .name = ISL29003_DRV_NAME, + .owner = THIS_MODULE, + }, + .suspend = isl29003_suspend, + .resume = isl29003_resume, + .probe = isl29003_probe, + .remove = __devexit_p(isl29003_remove), + .id_table = isl29003_id, +}; + +static int __init isl29003_init(void) +{ + return i2c_add_driver(&isl29003_driver); +} + +static void __exit isl29003_exit(void) +{ + i2c_del_driver(&isl29003_driver); +} + +MODULE_AUTHOR("Daniel Mack <[email protected]>"); +MODULE_DESCRIPTION("ISL29003 ambient light sensor driver"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(DRIVER_VERSION); + +module_init(isl29003_init); +module_exit(isl29003_exit); + -- 1.6.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
