275 lines
7.0 KiB
C
275 lines
7.0 KiB
C
/*
|
|
* 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,
|
|
};
|
|
|
|
static int __init lis3lv02d_init(void)
|
|
{
|
|
return i2c_add_driver(&lis3lv02d_i2c_driver);
|
|
}
|
|
|
|
static void __exit lis3lv02d_exit(void)
|
|
{
|
|
i2c_del_driver(&lis3lv02d_i2c_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Nokia Corporation");
|
|
MODULE_DESCRIPTION("lis3lv02d I2C interface");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(lis3lv02d_init);
|
|
module_exit(lis3lv02d_exit);
|