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 36static 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 42static 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 49static 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, ®); 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 */ 64static struct axis_conversion lis3lv02d_axis_map = { LIS3_DEV_X, 65 LIS3_DEV_Y, 66 LIS3_DEV_Z }; 67 68static 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); 101fail: 102 return ret; 103} 104 105static 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 120static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg) 121{ 122 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 123 124 if (!lis3->pdata || !lis3->pdata->wakeup_flags) 125 lis3lv02d_poweroff(lis3); 126 return 0; 127} 128 129static int lis3lv02d_i2c_resume(struct i2c_client *client) 130{ 131 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 132 133 if (!lis3->pdata || !lis3->pdata->wakeup_flags) 134 lis3lv02d_poweron(lis3); 135 return 0; 136} 137 138static 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 148static const struct i2c_device_id lis3lv02d_id[] = { 149 {"lis3lv02d", 0 }, 150 {} 151}; 152 153MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); 154 155static 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 168static int __init lis3lv02d_init(void) 169{ 170 return i2c_add_driver(&lis3lv02d_i2c_driver); 171} 172 173static void __exit lis3lv02d_exit(void) 174{ 175 i2c_del_driver(&lis3lv02d_i2c_driver); 176} 177 178MODULE_AUTHOR("Nokia Corporation"); 179MODULE_DESCRIPTION("lis3lv02d I2C interface"); 180MODULE_LICENSE("GPL"); 181 182module_init(lis3lv02d_init); 183module_exit(lis3lv02d_exit); 184