[net-next-2.6.git] / drivers / hwmon / lis3lv02d_i2c.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 "lis3lv02d.h"

#define DRV_NAME 	"lis3lv02d_i2c"

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 int lis3_i2c_init(struct lis3lv02d *lis3)
{
	u8 reg;
	int ret;

	/* power up the device */
	ret = lis3->read(lis3, CTRL_REG1, &reg);
	if (ret < 0)
		return ret;

	reg |= CTRL1_PD0;
	return lis3->write(lis3, CTRL_REG1, reg);
}

/* Default axis mapping but it can be overwritten by platform data */
static struct axis_conversion lis3lv02d_axis_map = { 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->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.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;

	i2c_set_clientdata(client, &lis3_dev);
	ret = lis3lv02d_init_device(&lis3_dev);
fail:
	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();
	lis3lv02d_poweroff(lis3);

	return lis3lv02d_remove_fs(&lis3_dev);
}

#ifdef CONFIG_PM
static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
{
	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 i2c_client *client)
{
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
		lis3lv02d_poweron(lis3);
	return 0;
}

static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
{
	lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
}
#else
#define lis3lv02d_i2c_suspend	NULL
#define lis3lv02d_i2c_resume	NULL
#define lis3lv02d_i2c_shutdown	NULL
#endif

static const struct i2c_device_id lis3lv02d_id[] = {
	{"lis3lv02d", 0 },
	{}
};

MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);

static struct i2c_driver lis3lv02d_i2c_driver = {
	.driver	 = {
		.name   = DRV_NAME,
		.owner  = THIS_MODULE,
	},
	.suspend = lis3lv02d_i2c_suspend,
	.shutdown = lis3lv02d_i2c_shutdown,
	.resume = lis3lv02d_i2c_resume,
	.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);
Commit	Line	Data
312ea07b SO	1	/*
	2	* drivers/hwmon/lis3lv02d_i2c.c
	3	*
	4	* Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
	5	* Driver is based on corresponding SPI driver written by Daniel Mack
	6	* (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
	7	*
	8	* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
	9	*
	10	* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License
	14	* version 2 as published by the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope that it will be useful, but
	17	* WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	24	* 02110-1301 USA
	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/kernel.h>
	29	#include <linux/init.h>
	30	#include <linux/err.h>
	31	#include <linux/i2c.h>
	32	#include "lis3lv02d.h"
	33
	34	#define DRV_NAME "lis3lv02d_i2c"
	35
	36	static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
	37	{
	38	struct i2c_client *c = lis3->bus_priv;
	39	return i2c_smbus_write_byte_data(c, reg, value);
	40	}
	41
	42	static inline s32 lis3_i2c_read(struct lis3lv02d lis3, int reg, u8 v)
	43	{
	44	struct i2c_client *c = lis3->bus_priv;
	45	*v = i2c_smbus_read_byte_data(c, reg);
	46	return 0;
	47	}
	48
	49	static int lis3_i2c_init(struct lis3lv02d *lis3)
	50	{
	51	u8 reg;
	52	int ret;
	53
	54	/* power up the device */
	55	ret = lis3->read(lis3, CTRL_REG1, &reg);
	56	if (ret < 0)
	57	return ret;
	58
	59	reg \|= CTRL1_PD0;
	60	return lis3->write(lis3, CTRL_REG1, reg);
	61	}
	62
	63	/* Default axis mapping but it can be overwritten by platform data */
	64	static struct axis_conversion lis3lv02d_axis_map = { LIS3_DEV_X,
65	LIS3_DEV_Y,
66	LIS3_DEV_Z };
67
68	static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
69	const struct i2c_device_id *id)
70	{
71	int ret = 0;
72	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
73
74	if (pdata) {
75	if (pdata->axis_x)
76	lis3lv02d_axis_map.x = pdata->axis_x;
77
78	if (pdata->axis_y)
79	lis3lv02d_axis_map.y = pdata->axis_y;
80
81	if (pdata->axis_z)
82	lis3lv02d_axis_map.z = pdata->axis_z;
83
84	if (pdata->setup_resources)
85	ret = pdata->setup_resources();
86
87	if (ret)
88	goto fail;
89	}
90
91	lis3_dev.pdata = pdata;
92	lis3_dev.bus_priv = client;
93	lis3_dev.init = lis3_i2c_init;
94	lis3_dev.read = lis3_i2c_read;
95	lis3_dev.write = lis3_i2c_write;
96	lis3_dev.irq = client->irq;
97	lis3_dev.ac = lis3lv02d_axis_map;
98
99	i2c_set_clientdata(client, &lis3_dev);
100	ret = lis3lv02d_init_device(&lis3_dev);
101	fail:
102	return ret;
103	}
104
105	static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
106	{
107	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
108	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
109
110	if (pdata && pdata->release_resources)
111	pdata->release_resources();
112
113	lis3lv02d_joystick_disable();
114	lis3lv02d_poweroff(lis3);
115
116	return lis3lv02d_remove_fs(&lis3_dev);
117	}
118
119	#ifdef CONFIG_PM
120	static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
121	{
122	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
123
5facb097	124	if (!lis3->pdata \|\| !lis3->pdata->wakeup_flags)
312ea07b SO	125	lis3lv02d_poweroff(lis3);
	126	return 0;
	127	}
	128
	129	static int lis3lv02d_i2c_resume(struct i2c_client *client)
	130	{
	131	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
	132
5facb097	133	if (!lis3->pdata \|\| !lis3->pdata->wakeup_flags)
312ea07b SO	134	lis3lv02d_poweron(lis3);
	135	return 0;
	136	}
	137
	138	static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
	139	{
	140	lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
	141	}
	142	#else
	143	#define lis3lv02d_i2c_suspend NULL
	144	#define lis3lv02d_i2c_resume NULL
	145	#define lis3lv02d_i2c_shutdown NULL
	146	#endif
	147
	148	static const struct i2c_device_id lis3lv02d_id[] = {
	149	{"lis3lv02d", 0 },
	150	{}
	151	};
	152
	153	MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
	154
	155	static struct i2c_driver lis3lv02d_i2c_driver = {
	156	.driver = {
	157	.name = DRV_NAME,
	158	.owner = THIS_MODULE,
	159	},
	160	.suspend = lis3lv02d_i2c_suspend,
	161	.shutdown = lis3lv02d_i2c_shutdown,
	162	.resume = lis3lv02d_i2c_resume,
	163	.probe = lis3lv02d_i2c_probe,
	164	.remove = __devexit_p(lis3lv02d_i2c_remove),
	165	.id_table = lis3lv02d_id,
	166	};
	167
	168	static int __init lis3lv02d_init(void)
	169	{
	170	return i2c_add_driver(&lis3lv02d_i2c_driver);
	171	}
	172
	173	static void __exit lis3lv02d_exit(void)
	174	{
	175	i2c_del_driver(&lis3lv02d_i2c_driver);
	176	}
	177
	178	MODULE_AUTHOR("Nokia Corporation");
	179	MODULE_DESCRIPTION("lis3lv02d I2C interface");
	180	MODULE_LICENSE("GPL");
	181
	182	module_init(lis3lv02d_init);
	183	module_exit(lis3lv02d_exit);