blob: 8853afce85ce138464787fc9182e27be9206ef1f [file] [log] [blame]
Samu Onkalo312ea072009-12-17 15:27:07 -08001/*
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>
Samu Onkalo2a346992010-10-22 07:57:23 -040032#include <linux/pm_runtime.h>
Samu Onkalof9deb412010-10-22 07:57:24 -040033#include <linux/delay.h>
Samu Onkalo312ea072009-12-17 15:27:07 -080034#include "lis3lv02d.h"
35
36#define DRV_NAME "lis3lv02d_i2c"
37
Samu Onkalof9deb412010-10-22 07:57:24 -040038static const char reg_vdd[] = "Vdd";
39static const char reg_vdd_io[] = "Vdd_IO";
40
41static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
42{
43 int ret;
44 if (state == LIS3_REG_OFF) {
45 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
46 lis3->regulators);
47 } else {
48 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
49 lis3->regulators);
50 /* Chip needs time to wakeup. Not mentioned in datasheet */
51 usleep_range(10000, 20000);
52 }
53 return ret;
54}
55
Samu Onkalo312ea072009-12-17 15:27:07 -080056static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
57{
58 struct i2c_client *c = lis3->bus_priv;
59 return i2c_smbus_write_byte_data(c, reg, value);
60}
61
62static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
63{
64 struct i2c_client *c = lis3->bus_priv;
65 *v = i2c_smbus_read_byte_data(c, reg);
66 return 0;
67}
68
Samu Onkalof10a5402010-10-22 07:57:31 -040069static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
70 u8 *v)
71{
72 struct i2c_client *c = lis3->bus_priv;
73 reg |= (1 << 7); /* 7th bit enables address auto incrementation */
74 return i2c_smbus_read_i2c_block_data(c, reg, len, v);
75}
76
Samu Onkalo312ea072009-12-17 15:27:07 -080077static int lis3_i2c_init(struct lis3lv02d *lis3)
78{
79 u8 reg;
80 int ret;
81
Samu Onkalof9deb412010-10-22 07:57:24 -040082 if (lis3->reg_ctrl)
83 lis3_reg_ctrl(lis3, LIS3_REG_ON);
84
85 lis3->read(lis3, WHO_AM_I, &reg);
86 if (reg != lis3->whoami)
87 printk(KERN_ERR "lis3: power on failure\n");
88
Samu Onkalo312ea072009-12-17 15:27:07 -080089 /* power up the device */
90 ret = lis3->read(lis3, CTRL_REG1, &reg);
91 if (ret < 0)
92 return ret;
93
Samu Onkaloed37d7f2010-10-22 07:57:28 -040094 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
Samu Onkalo312ea072009-12-17 15:27:07 -080095 return lis3->write(lis3, CTRL_REG1, reg);
96}
97
98/* Default axis mapping but it can be overwritten by platform data */
Takashi Iwai2ee32142010-10-01 17:14:25 -040099static union axis_conversion lis3lv02d_axis_map =
100 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
Samu Onkalo312ea072009-12-17 15:27:07 -0800101
102static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
103 const struct i2c_device_id *id)
104{
105 int ret = 0;
106 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
107
108 if (pdata) {
Samu Onkalof9deb412010-10-22 07:57:24 -0400109 /* Regulator control is optional */
110 if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
111 lis3_dev.reg_ctrl = lis3_reg_ctrl;
112
Samu Onkalof10a5402010-10-22 07:57:31 -0400113 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
114 (i2c_check_functionality(client->adapter,
115 I2C_FUNC_SMBUS_I2C_BLOCK)))
116 lis3_dev.blkread = lis3_i2c_blockread;
117
Samu Onkalo312ea072009-12-17 15:27:07 -0800118 if (pdata->axis_x)
119 lis3lv02d_axis_map.x = pdata->axis_x;
120
121 if (pdata->axis_y)
122 lis3lv02d_axis_map.y = pdata->axis_y;
123
124 if (pdata->axis_z)
125 lis3lv02d_axis_map.z = pdata->axis_z;
126
127 if (pdata->setup_resources)
128 ret = pdata->setup_resources();
129
130 if (ret)
131 goto fail;
132 }
133
Samu Onkalof9deb412010-10-22 07:57:24 -0400134 if (lis3_dev.reg_ctrl) {
135 lis3_dev.regulators[0].supply = reg_vdd;
136 lis3_dev.regulators[1].supply = reg_vdd_io;
137 ret = regulator_bulk_get(&client->dev,
138 ARRAY_SIZE(lis3_dev.regulators),
139 lis3_dev.regulators);
140 if (ret < 0)
141 goto fail;
142 }
143
Samu Onkalo312ea072009-12-17 15:27:07 -0800144 lis3_dev.pdata = pdata;
145 lis3_dev.bus_priv = client;
146 lis3_dev.init = lis3_i2c_init;
147 lis3_dev.read = lis3_i2c_read;
148 lis3_dev.write = lis3_i2c_write;
149 lis3_dev.irq = client->irq;
150 lis3_dev.ac = lis3lv02d_axis_map;
Samu Onkalo2a346992010-10-22 07:57:23 -0400151 lis3_dev.pm_dev = &client->dev;
Samu Onkalo312ea072009-12-17 15:27:07 -0800152
153 i2c_set_clientdata(client, &lis3_dev);
Samu Onkalof9deb412010-10-22 07:57:24 -0400154
155 /* Provide power over the init call */
156 if (lis3_dev.reg_ctrl)
157 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
158
Samu Onkalo312ea072009-12-17 15:27:07 -0800159 ret = lis3lv02d_init_device(&lis3_dev);
Samu Onkalof9deb412010-10-22 07:57:24 -0400160
161 if (lis3_dev.reg_ctrl)
162 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
Samu Onkalob11e7b32010-10-22 07:57:34 -0400163
164 if (ret == 0)
165 return 0;
Samu Onkalo312ea072009-12-17 15:27:07 -0800166fail:
Samu Onkalob11e7b32010-10-22 07:57:34 -0400167 if (pdata && pdata->release_resources)
168 pdata->release_resources();
Samu Onkalo312ea072009-12-17 15:27:07 -0800169 return ret;
170}
171
172static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
173{
Samu Onkalof9deb412010-10-22 07:57:24 -0400174 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
Samu Onkalo312ea072009-12-17 15:27:07 -0800175 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
176
177 if (pdata && pdata->release_resources)
178 pdata->release_resources();
179
180 lis3lv02d_joystick_disable();
Samu Onkalof9deb412010-10-22 07:57:24 -0400181 lis3lv02d_remove_fs(&lis3_dev);
Samu Onkalo312ea072009-12-17 15:27:07 -0800182
Samu Onkalof9deb412010-10-22 07:57:24 -0400183 if (lis3_dev.reg_ctrl)
184 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
185 lis3_dev.regulators);
186 return 0;
Samu Onkalo312ea072009-12-17 15:27:07 -0800187}
188
Guenter Roeck32292f42010-11-18 21:06:45 -0800189#ifdef CONFIG_PM_SLEEP
Samu Onkalo2a346992010-10-22 07:57:23 -0400190static int lis3lv02d_i2c_suspend(struct device *dev)
Samu Onkalo312ea072009-12-17 15:27:07 -0800191{
Samu Onkalo2a346992010-10-22 07:57:23 -0400192 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
Samu Onkalo312ea072009-12-17 15:27:07 -0800193 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
194
Kuninori Morimoto5facb092010-09-17 17:24:10 +0200195 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
Samu Onkalo312ea072009-12-17 15:27:07 -0800196 lis3lv02d_poweroff(lis3);
197 return 0;
198}
199
Samu Onkalo2a346992010-10-22 07:57:23 -0400200static int lis3lv02d_i2c_resume(struct device *dev)
Samu Onkalo312ea072009-12-17 15:27:07 -0800201{
Samu Onkalo2a346992010-10-22 07:57:23 -0400202 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
Samu Onkalo312ea072009-12-17 15:27:07 -0800203 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
204
Samu Onkalo2a346992010-10-22 07:57:23 -0400205 /*
206 * pm_runtime documentation says that devices should always
207 * be powered on at resume. Pm_runtime turns them off after system
208 * wide resume is complete.
209 */
210 if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
211 pm_runtime_suspended(dev))
Samu Onkalo312ea072009-12-17 15:27:07 -0800212 lis3lv02d_poweron(lis3);
Samu Onkalo312ea072009-12-17 15:27:07 -0800213
Samu Onkalo2a346992010-10-22 07:57:23 -0400214 return 0;
Samu Onkalo312ea072009-12-17 15:27:07 -0800215}
Guenter Roeck32292f42010-11-18 21:06:45 -0800216#endif /* CONFIG_PM_SLEEP */
Samu Onkalo312ea072009-12-17 15:27:07 -0800217
Guenter Roeck32292f42010-11-18 21:06:45 -0800218#ifdef CONFIG_PM_RUNTIME
Samu Onkalo2a346992010-10-22 07:57:23 -0400219static int lis3_i2c_runtime_suspend(struct device *dev)
220{
221 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
222 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
223
224 lis3lv02d_poweroff(lis3);
225 return 0;
226}
227
228static int lis3_i2c_runtime_resume(struct device *dev)
229{
230 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
231 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
232
233 lis3lv02d_poweron(lis3);
234 return 0;
235}
Guenter Roeck32292f42010-11-18 21:06:45 -0800236#endif /* CONFIG_PM_RUNTIME */
Samu Onkalo2a346992010-10-22 07:57:23 -0400237
Samu Onkalo312ea072009-12-17 15:27:07 -0800238static const struct i2c_device_id lis3lv02d_id[] = {
239 {"lis3lv02d", 0 },
240 {}
241};
242
243MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
244
Samu Onkalo2a346992010-10-22 07:57:23 -0400245static const struct dev_pm_ops lis3_pm_ops = {
246 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
247 lis3lv02d_i2c_resume)
248 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
249 lis3_i2c_runtime_resume,
250 NULL)
251};
252
Samu Onkalo312ea072009-12-17 15:27:07 -0800253static struct i2c_driver lis3lv02d_i2c_driver = {
254 .driver = {
255 .name = DRV_NAME,
256 .owner = THIS_MODULE,
Samu Onkalo2a346992010-10-22 07:57:23 -0400257 .pm = &lis3_pm_ops,
Samu Onkalo312ea072009-12-17 15:27:07 -0800258 },
Samu Onkalo312ea072009-12-17 15:27:07 -0800259 .probe = lis3lv02d_i2c_probe,
260 .remove = __devexit_p(lis3lv02d_i2c_remove),
261 .id_table = lis3lv02d_id,
262};
263
264static int __init lis3lv02d_init(void)
265{
266 return i2c_add_driver(&lis3lv02d_i2c_driver);
267}
268
269static void __exit lis3lv02d_exit(void)
270{
271 i2c_del_driver(&lis3lv02d_i2c_driver);
272}
273
274MODULE_AUTHOR("Nokia Corporation");
275MODULE_DESCRIPTION("lis3lv02d I2C interface");
276MODULE_LICENSE("GPL");
277
278module_init(lis3lv02d_init);
279module_exit(lis3lv02d_exit);