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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, ®); | |
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 | ||
124 | if (!lis3->pdata->wakeup_flags) | |
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 | ||
133 | if (!lis3->pdata->wakeup_flags) | |
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); |