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/*
* drivers/hwmon/lis3lv02d_i2c.c
*
* Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
* Driver is based on corresponding SPI driver written by Daniel Mack
* (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
*
* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
#include "lis3lv02d.h"
#define DRV_NAME "lis3lv02d_i2c"
static const char reg_vdd[] = "Vdd";
static const char reg_vdd_io[] = "Vdd_IO";
static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
{
int ret;
if (state == LIS3_REG_OFF) {
ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
lis3->regulators);
} else {
ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
lis3->regulators);
/* Chip needs time to wakeup. Not mentioned in datasheet */
usleep_range(10000, 20000);
}
return ret;
}
static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
{
struct i2c_client *c = lis3->bus_priv;
return i2c_smbus_write_byte_data(c, reg, value);
}
static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
{
struct i2c_client *c = lis3->bus_priv;
*v = i2c_smbus_read_byte_data(c, reg);
return 0;
}
static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
u8 *v)
{
struct i2c_client *c = lis3->bus_priv;
reg |= (1 << 7); /* 7th bit enables address auto incrementation */
return i2c_smbus_read_i2c_block_data(c, reg, len, v);
}
static int lis3_i2c_init(struct lis3lv02d *lis3)
{
u8 reg;
int ret;
lis3_reg_ctrl(lis3, LIS3_REG_ON);
lis3->read(lis3, WHO_AM_I, ®);
if (reg != lis3->whoami)
printk(KERN_ERR "lis3: power on failure\n");
/* power up the device */
ret = lis3->read(lis3, CTRL_REG1, ®);
if (ret < 0)
return ret;
reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
return lis3->write(lis3, CTRL_REG1, reg);
}
/* Default axis mapping but it can be overwritten by platform data */
static union axis_conversion lis3lv02d_axis_map =
{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret = 0;
struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
if (pdata) {
if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
(i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_I2C_BLOCK)))
lis3_dev.blkread = lis3_i2c_blockread;
if (pdata->axis_x)
lis3lv02d_axis_map.x = pdata->axis_x;
if (pdata->axis_y)
lis3lv02d_axis_map.y = pdata->axis_y;
if (pdata->axis_z)
lis3lv02d_axis_map.z = pdata->axis_z;
if (pdata->setup_resources)
ret = pdata->setup_resources();
if (ret)
goto fail;
}
lis3_dev.regulators[0].supply = reg_vdd;
lis3_dev.regulators[1].supply = reg_vdd_io;
ret = regulator_bulk_get(&client->dev,
ARRAY_SIZE(lis3_dev.regulators),
lis3_dev.regulators);
if (ret < 0)
goto fail;
lis3_dev.pdata = pdata;
lis3_dev.bus_priv = client;
lis3_dev.init = lis3_i2c_init;
lis3_dev.read = lis3_i2c_read;
lis3_dev.write = lis3_i2c_write;
lis3_dev.irq = client->irq;
lis3_dev.ac = lis3lv02d_axis_map;
lis3_dev.pm_dev = &client->dev;
i2c_set_clientdata(client, &lis3_dev);
/* Provide power over the init call */
lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
ret = lis3lv02d_init_device(&lis3_dev);
lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
if (ret)
goto fail2;
return 0;
fail2:
regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
lis3_dev.regulators);
fail:
if (pdata && pdata->release_resources)
pdata->release_resources();
return ret;
}
static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
{
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
if (pdata && pdata->release_resources)
pdata->release_resources();
lis3lv02d_joystick_disable(lis3);
lis3lv02d_remove_fs(&lis3_dev);
regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
lis3_dev.regulators);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int lis3lv02d_i2c_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
lis3lv02d_poweroff(lis3);
return 0;
}
static int lis3lv02d_i2c_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
/*
* pm_runtime documentation says that devices should always
* be powered on at resume. Pm_runtime turns them off after system
* wide resume is complete.
*/
if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
pm_runtime_suspended(dev))
lis3lv02d_poweron(lis3);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM_RUNTIME
static int lis3_i2c_runtime_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
lis3lv02d_poweroff(lis3);
return 0;
}
static int lis3_i2c_runtime_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
lis3lv02d_poweron(lis3);
return 0;
}
#endif /* CONFIG_PM_RUNTIME */
static const struct i2c_device_id lis3lv02d_id[] = {
{"lis3lv02d", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
static const struct dev_pm_ops lis3_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
lis3lv02d_i2c_resume)
SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
lis3_i2c_runtime_resume,
NULL)
};
static struct i2c_driver lis3lv02d_i2c_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.pm = &lis3_pm_ops,
},
.probe = lis3lv02d_i2c_probe,
.remove = __devexit_p(lis3lv02d_i2c_remove),
.id_table = lis3lv02d_id,
};
module_i2c_driver(lis3lv02d_i2c_driver);
MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("lis3lv02d I2C interface");
MODULE_LICENSE("GPL");
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