mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
![Krzysztof Kozlowski](/assets/img/avatar_default.png)
i2c_driver does not need to set an owner because i2c_register_driver() will set it. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
480 lines
12 KiB
C
480 lines
12 KiB
C
/*
|
|
* isl29003.c - Linux kernel module for
|
|
* Intersil ISL29003 ambient light sensor
|
|
*
|
|
* See file:Documentation/misc-devices/isl29003
|
|
*
|
|
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
|
|
*
|
|
* Based on code written by
|
|
* Rodolfo Giometti <giometti@linux.it>
|
|
* Eurotech S.p.A. <info@eurotech.it>
|
|
*
|
|
* 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/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
|
|
|
|
#define ISL29003_NUM_CACHABLE_REGS 4
|
|
|
|
struct isl29003_data {
|
|
struct i2c_client *client;
|
|
struct mutex lock;
|
|
u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
|
|
u8 power_state_before_suspend;
|
|
};
|
|
|
|
static int gain_range[] = {
|
|
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);
|
|
int ret = 0;
|
|
u8 tmp;
|
|
|
|
if (reg >= ISL29003_NUM_CACHABLE_REGS)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->lock);
|
|
|
|
tmp = data->reg_cache[reg];
|
|
tmp &= ~mask;
|
|
tmp |= val << shift;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, reg, tmp);
|
|
if (!ret)
|
|
data->reg_cache[reg] = tmp;
|
|
|
|
mutex_unlock(&data->lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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 res)
|
|
{
|
|
return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
|
|
ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
|
|
ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0,
|
|
state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
|
|
}
|
|
|
|
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_PD;
|
|
}
|
|
|
|
static int isl29003_get_adc_value(struct i2c_client *client)
|
|
{
|
|
struct isl29003_data *data = i2c_get_clientdata(client);
|
|
int lsb, msb, range, bitdepth;
|
|
|
|
mutex_lock(&data->lock);
|
|
lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
|
|
|
|
if (lsb < 0) {
|
|
mutex_unlock(&data->lock);
|
|
return lsb;
|
|
}
|
|
|
|
msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
|
|
mutex_unlock(&data->lock);
|
|
|
|
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);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val > 3)
|
|
return -EINVAL;
|
|
|
|
ret = isl29003_set_range(client, val);
|
|
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, "%d\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);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val > 3)
|
|
return -EINVAL;
|
|
|
|
ret = isl29003_set_resolution(client, val);
|
|
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, "%d\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);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val > 2)
|
|
return -EINVAL;
|
|
|
|
ret = isl29003_set_mode(client, val);
|
|
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, "%d\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);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val > 1)
|
|
return -EINVAL;
|
|
|
|
ret = isl29003_set_power_state(client, val);
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
|
|
isl29003_show_power_state, isl29003_store_power_state);
|
|
|
|
|
|
/* lux */
|
|
static ssize_t isl29003_show_lux(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
/* No LUX data if not operational */
|
|
if (!isl29003_get_power_state(client))
|
|
return -EBUSY;
|
|
|
|
return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
|
|
}
|
|
|
|
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 one of the reads 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 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))
|
|
return -EIO;
|
|
|
|
data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
i2c_set_clientdata(client, data);
|
|
mutex_init(&data->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);
|
|
return err;
|
|
}
|
|
|
|
static int 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_SLEEP
|
|
static int isl29003_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct isl29003_data *data = i2c_get_clientdata(client);
|
|
|
|
data->power_state_before_suspend = isl29003_get_power_state(client);
|
|
return isl29003_set_power_state(client, 0);
|
|
}
|
|
|
|
static int isl29003_resume(struct device *dev)
|
|
{
|
|
int i;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct isl29003_data *data = i2c_get_clientdata(client);
|
|
|
|
/* restore registers from cache */
|
|
for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
|
|
if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
|
|
return -EIO;
|
|
|
|
return isl29003_set_power_state(client,
|
|
data->power_state_before_suspend);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
|
|
#define ISL29003_PM_OPS (&isl29003_pm_ops)
|
|
|
|
#else
|
|
#define ISL29003_PM_OPS NULL
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
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,
|
|
.pm = ISL29003_PM_OPS,
|
|
},
|
|
.probe = isl29003_probe,
|
|
.remove = isl29003_remove,
|
|
.id_table = isl29003_id,
|
|
};
|
|
|
|
module_i2c_driver(isl29003_driver);
|
|
|
|
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
|
MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_VERSION(DRIVER_VERSION);
|