diff options
Diffstat (limited to 'drivers/hwmon/isl29003.c')
| -rw-r--r-- | drivers/hwmon/isl29003.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/hwmon/isl29003.c b/drivers/hwmon/isl29003.c new file mode 100644 index 000000000000..18c9947b3cd8 --- /dev/null +++ b/drivers/hwmon/isl29003.c @@ -0,0 +1,439 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file drivers/hwmon/isl29003.c + * + * @brief ISL29003 light sensor Driver + * + * @ingroup + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/regulator/consumer.h> +#include <linux/fsl_devices.h> +#include <linux/slab.h> + +enum isl29003_width { + ISL29003_WIDTH_16 = 0, + ISL29003_WIDTH_12, + ISL29003_WIDTH_8, + ISL29003_WIDTH_4, +}; + +enum isl29003_gain { + ISL29003_GAIN_1000 = 0, + ISL29003_GAIN_4000, + ISL29003_GAIN_16000, + ISL29003_GAIN_64000, +}; + +enum isl29003_mode { + ISL29003_MODE_DIODE1 = 0, + ISL29003_MODE_DIODE2, + ISL29003_MODE_DIODE1_2, +}; + +struct isl29003_param { + enum isl29003_width width; + enum isl29003_gain gain; + enum isl29003_mode mode; +}; + +/* bit definition for ISL29003_CMD reg */ +#define ENABLE 7 +#define ADCPD 6 +#define TIMEING_MODE 5 +#define MODE 2 +#define WIDTH 0 + +/* bit definition for ISL29003_CTRL reg */ +#define INT_FLAG 5 +#define GAIN 2 +#define INT_PERSIST 0 + +enum isl29003_reg { + ISL29003_CMD = 0, + ISL29003_CTRL, + ISL29003_THRS_HI, + ISL29003_THRS_LO, + ISL29003_LSB_S, + ISL29003_MSB_S, + ISL29003_LSB_T, + ISL29003_MSB_T, + ISL29003_SYNC_IIC = 0x80, + ISL29003_CLAR_INT = 0x40 +}; + +/* default configure for ISL29003 */ +#define ISL29003_WIDTH_DEFAULT ISL29003_WIDTH_16 +#define ISL29003_GAIN_DEFAULT ISL29003_GAIN_16000 +#define ISL29003_MODE_DEFAULT ISL29003_MODE_DIODE1 + +/* range table for different GAIN settings */ +int range[4] = { 973, 3892, 15568, 62272 }; + +/* width table for different WIDTH settings */ +int width[4] = { 16, 1, 256, 16 }; + +struct isl29003_data { + struct i2c_client *client; + struct device *hwmon_dev; + struct regulator *vdd_reg; + struct isl29003_param param; + int lux_coeff; + unsigned char enable; +}; + +static struct i2c_client *isl29003_client; + +/*! + * This function do the isl29003 register read. + */ +int isl29003_read(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +/*! + * This function do the isl29003 register write. + */ +int isl29003_write(struct i2c_client *client, u8 reg, char value) +{ + return i2c_smbus_write_byte_data(client, reg, value); +} + +/*! + * This function do the isl29003 config and enable. + */ +static int isl29003_on(void) +{ + unsigned char cmd; + int err = 0; + struct mxc_lightsensor_platform_data *ls_data; + struct isl29003_data *data = i2c_get_clientdata(isl29003_client); + + if (data->enable) + goto exit; + + ls_data = (struct mxc_lightsensor_platform_data *) + (isl29003_client->dev).platform_data; + + /* coeff=range*100k/rext/2^n */ + data->lux_coeff = range[data->param.gain] * 100 / + ls_data->rext / width[data->param.width]; + + if (data->vdd_reg) + regulator_enable(data->vdd_reg); + msleep(100); + + cmd = data->param.gain << GAIN; + if (isl29003_write(isl29003_client, ISL29003_CTRL, cmd)) { + err = -ENODEV; + goto exit; + } + + cmd = (data->param.width << WIDTH) | (data->param.mode << MODE) | + (1 << ENABLE); + if (isl29003_write(isl29003_client, ISL29003_CMD, cmd)) { + err = -ENODEV; + goto exit; + } + + data->enable = 1; + + pr_info("isl29003 on\n"); + return 0; +exit: + return err; +} + +/*! + * This function shut down the isl29003. + */ +static int isl29003_off(void) +{ + struct isl29003_data *data = i2c_get_clientdata(isl29003_client); + int cmd; + + if (!data->enable) + return 0; + + cmd = isl29003_read(isl29003_client, ISL29003_CMD); + if (cmd < 0) + return -ENODEV; + + cmd = ((cmd | (1 << ADCPD)) & (~(1 << ENABLE))); + if (isl29003_write(isl29003_client, ISL29003_CMD, (char)cmd)) + return -ENODEV; + + if (data->vdd_reg) + regulator_disable(data->vdd_reg); + + data->enable = 0; + + pr_info("isl29003 off\n"); + return 0; +} + +/*! + * This function read the isl29003 lux registers and convert them to the lux + * value. + * + * @output buffer this param holds the lux value, when =-1, read fail + * + * @return 0 + */ +static int isl29003_read_lux(void) +{ + int d; + int lux; + struct isl29003_data *data = i2c_get_clientdata(isl29003_client); + + d = isl29003_read(isl29003_client, ISL29003_MSB_S); + if (d < 0) + goto err; + + lux = d; + d = isl29003_read(isl29003_client, ISL29003_LSB_S); + if (d < 0) + goto err; + + lux = (lux << 8) + d; + + if (data->param.width < ISL29003_WIDTH_8) + lux = (data->lux_coeff * lux) >> 12; + else + lux = data->lux_coeff * lux; + + return lux; +err: + return -1; +} + +static ssize_t ls_enable(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + char *endp; + int enable = simple_strtoul(buf, &endp, 0); + size_t size = endp - buf; + + if (*endp && isspace(*endp)) + size++; + if (size != count) + return -EINVAL; + + if (enable == 1) { + if (isl29003_on()) + pr_info("device open fail\n"); + } + if (enable == 0) { + if (isl29003_off()) + pr_info("device powerdown fail\n"); + } + + return count; +} + +static SENSOR_DEVICE_ATTR(enable, S_IWUGO, NULL, ls_enable, 0); + +static ssize_t show_lux(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%u\n", isl29003_read_lux()); +} + +static SENSOR_DEVICE_ATTR(lux, S_IRUGO, show_lux, NULL, 0); + +static int isl29003_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *did) +{ + int err = 0; + struct isl29003_data *data; + struct regulator *vdd_reg; + struct mxc_lightsensor_platform_data *ls_data; + + ls_data = (struct mxc_lightsensor_platform_data *) + (client->dev).platform_data; + + if (ls_data && ls_data->vdd_reg) + vdd_reg = regulator_get(&client->dev, ls_data->vdd_reg); + else + vdd_reg = NULL; + + /* check the existence of the device */ + if (vdd_reg) + regulator_enable(vdd_reg); + msleep(100); + + if (isl29003_write(client, ISL29003_CMD, 0)) + err = -ENODEV; + + if (!err) + if (isl29003_read(client, ISL29003_CMD)) + err = -ENODEV; + + if (vdd_reg) + regulator_disable(vdd_reg); + if (err < 0) + goto exit1; + + isl29003_client = client; + data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL); + if (data == NULL) { + err = -ENOMEM; + goto exit1; + } + + i2c_set_clientdata(client, data); + data->client = client; + + data->param.width = ISL29003_WIDTH_DEFAULT; + data->param.gain = ISL29003_GAIN_DEFAULT; + data->param.mode = ISL29003_MODE_DEFAULT; + + data->enable = 0; + + err = device_create_file(&client->dev, + &sensor_dev_attr_enable.dev_attr); + if (err) + goto exit2; + + err = device_create_file(&client->dev, &sensor_dev_attr_lux.dev_attr); + if (err) + goto exit_remove1; + + /* Register sysfs hooks */ + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove2; + } + + data->vdd_reg = vdd_reg; + return 0; + +exit_remove2: + device_remove_file(&client->dev, &sensor_dev_attr_lux.dev_attr); +exit_remove1: + device_remove_file(&client->dev, &sensor_dev_attr_enable.dev_attr); +exit2: + kfree(data); +exit1: + if (vdd_reg) { + regulator_put(vdd_reg); + vdd_reg = NULL; + } + isl29003_client = NULL; + return err; +} + +static int isl29003_i2c_remove(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + + if (data->vdd_reg) { + regulator_put(data->vdd_reg); + data->vdd_reg = NULL; + } + hwmon_device_unregister(data->hwmon_dev); + device_remove_file(&client->dev, &sensor_dev_attr_enable.dev_attr); + device_remove_file(&client->dev, &sensor_dev_attr_lux.dev_attr); + kfree(data); + return 0; +} + +static int isl29003_suspend(struct i2c_client *client, pm_message_t message) +{ + int cmd; + + struct isl29003_data *data = i2c_get_clientdata(client); + + if (!data->enable) + goto exit; + + cmd = isl29003_read(client, ISL29003_CMD); + if (cmd < 0) + goto err; + + cmd = (cmd | (1 << ADCPD)); + if (isl29003_write(client, ISL29003_CMD, (char)cmd)) + goto err; +exit: + return 0; +err: + return -ENODEV; +} + +static int isl29003_resume(struct i2c_client *client) +{ + int cmd; + + struct isl29003_data *data = i2c_get_clientdata(client); + + if (!data->enable) + goto exit; + + cmd = isl29003_read(client, ISL29003_CMD); + if (cmd < 0) + goto err; + + cmd = (cmd & (~(1 << ADCPD))); + if (isl29003_write(client, ISL29003_CMD, (char)cmd)) + goto err; +exit: + return 0; +err: + return -ENODEV; +} + +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", + }, + .probe = isl29003_i2c_probe, + .remove = isl29003_i2c_remove, + .suspend = isl29003_suspend, + .resume = isl29003_resume, + .id_table = isl29003_id, +}; + +static int __init isl29003_init(void) +{ + return i2c_add_driver(&isl29003_driver);; +} + +static void __exit isl29003_cleanup(void) +{ + i2c_del_driver(&isl29003_driver); +} + +module_init(isl29003_init); +module_exit(isl29003_cleanup); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("ISL29003 light sensor driver"); +MODULE_LICENSE("GPL"); |