2 * drivers/hwmon/lis3lv02d_i2c.c
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> ).
8 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
10 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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.
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.
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
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 <linux/pm_runtime.h>
33 #include <linux/delay.h>
34 #include "lis3lv02d.h"
36 #define DRV_NAME "lis3lv02d_i2c"
38 static const char reg_vdd[] = "Vdd";
39 static const char reg_vdd_io[] = "Vdd_IO";
41 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
44 if (state == LIS3_REG_OFF) {
45 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
48 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
50 /* Chip needs time to wakeup. Not mentioned in datasheet */
51 usleep_range(10000, 20000);
56 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
58 struct i2c_client *c = lis3->bus_priv;
59 return i2c_smbus_write_byte_data(c, reg, value);
62 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
64 struct i2c_client *c = lis3->bus_priv;
65 *v = i2c_smbus_read_byte_data(c, reg);
69 static int lis3_i2c_init(struct lis3lv02d *lis3)
75 lis3_reg_ctrl(lis3, LIS3_REG_ON);
77 lis3->read(lis3, WHO_AM_I, ®);
78 if (reg != lis3->whoami)
79 printk(KERN_ERR "lis3: power on failure\n");
81 /* power up the device */
82 ret = lis3->read(lis3, CTRL_REG1, ®);
86 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
87 return lis3->write(lis3, CTRL_REG1, reg);
90 /* Default axis mapping but it can be overwritten by platform data */
91 static union axis_conversion lis3lv02d_axis_map =
92 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
94 static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
95 const struct i2c_device_id *id)
98 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
101 /* Regulator control is optional */
102 if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
103 lis3_dev.reg_ctrl = lis3_reg_ctrl;
106 lis3lv02d_axis_map.x = pdata->axis_x;
109 lis3lv02d_axis_map.y = pdata->axis_y;
112 lis3lv02d_axis_map.z = pdata->axis_z;
114 if (pdata->setup_resources)
115 ret = pdata->setup_resources();
121 if (lis3_dev.reg_ctrl) {
122 lis3_dev.regulators[0].supply = reg_vdd;
123 lis3_dev.regulators[1].supply = reg_vdd_io;
124 ret = regulator_bulk_get(&client->dev,
125 ARRAY_SIZE(lis3_dev.regulators),
126 lis3_dev.regulators);
131 lis3_dev.pdata = pdata;
132 lis3_dev.bus_priv = client;
133 lis3_dev.init = lis3_i2c_init;
134 lis3_dev.read = lis3_i2c_read;
135 lis3_dev.write = lis3_i2c_write;
136 lis3_dev.irq = client->irq;
137 lis3_dev.ac = lis3lv02d_axis_map;
138 lis3_dev.pm_dev = &client->dev;
140 i2c_set_clientdata(client, &lis3_dev);
142 /* Provide power over the init call */
143 if (lis3_dev.reg_ctrl)
144 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
146 ret = lis3lv02d_init_device(&lis3_dev);
148 if (lis3_dev.reg_ctrl)
149 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
154 static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
156 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
157 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
159 if (pdata && pdata->release_resources)
160 pdata->release_resources();
162 lis3lv02d_joystick_disable();
163 lis3lv02d_remove_fs(&lis3_dev);
165 if (lis3_dev.reg_ctrl)
166 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
167 lis3_dev.regulators);
172 static int lis3lv02d_i2c_suspend(struct device *dev)
174 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
175 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
177 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
178 lis3lv02d_poweroff(lis3);
182 static int lis3lv02d_i2c_resume(struct device *dev)
184 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
185 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
188 * pm_runtime documentation says that devices should always
189 * be powered on at resume. Pm_runtime turns them off after system
190 * wide resume is complete.
192 if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
193 pm_runtime_suspended(dev))
194 lis3lv02d_poweron(lis3);
199 #define lis3lv02d_i2c_suspend NULL
200 #define lis3lv02d_i2c_resume NULL
201 #define lis3lv02d_i2c_shutdown NULL
204 static int lis3_i2c_runtime_suspend(struct device *dev)
206 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
207 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
209 lis3lv02d_poweroff(lis3);
213 static int lis3_i2c_runtime_resume(struct device *dev)
215 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
216 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
218 lis3lv02d_poweron(lis3);
222 static const struct i2c_device_id lis3lv02d_id[] = {
227 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
229 static const struct dev_pm_ops lis3_pm_ops = {
230 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
231 lis3lv02d_i2c_resume)
232 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
233 lis3_i2c_runtime_resume,
237 static struct i2c_driver lis3lv02d_i2c_driver = {
240 .owner = THIS_MODULE,
243 .probe = lis3lv02d_i2c_probe,
244 .remove = __devexit_p(lis3lv02d_i2c_remove),
245 .id_table = lis3lv02d_id,
248 static int __init lis3lv02d_init(void)
250 return i2c_add_driver(&lis3lv02d_i2c_driver);
253 static void __exit lis3lv02d_exit(void)
255 i2c_del_driver(&lis3lv02d_i2c_driver);
258 MODULE_AUTHOR("Nokia Corporation");
259 MODULE_DESCRIPTION("lis3lv02d I2C interface");
260 MODULE_LICENSE("GPL");
262 module_init(lis3lv02d_init);
263 module_exit(lis3lv02d_exit);