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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> | |
2a346996 | 32 | #include <linux/pm_runtime.h> |
f9deb41f | 33 | #include <linux/delay.h> |
312ea07b SO |
34 | #include "lis3lv02d.h" |
35 | ||
36 | #define DRV_NAME "lis3lv02d_i2c" | |
37 | ||
f9deb41f SO |
38 | static const char reg_vdd[] = "Vdd"; |
39 | static const char reg_vdd_io[] = "Vdd_IO"; | |
40 | ||
41 | static 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 | ||
312ea07b SO |
56 | static 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 | ||
62 | static 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 | ||
f10a5407 SO |
69 | static 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 | ||
312ea07b SO |
77 | static int lis3_i2c_init(struct lis3lv02d *lis3) |
78 | { | |
79 | u8 reg; | |
80 | int ret; | |
81 | ||
f9deb41f SO |
82 | if (lis3->reg_ctrl) |
83 | lis3_reg_ctrl(lis3, LIS3_REG_ON); | |
84 | ||
85 | lis3->read(lis3, WHO_AM_I, ®); | |
86 | if (reg != lis3->whoami) | |
87 | printk(KERN_ERR "lis3: power on failure\n"); | |
88 | ||
312ea07b SO |
89 | /* power up the device */ |
90 | ret = lis3->read(lis3, CTRL_REG1, ®); | |
91 | if (ret < 0) | |
92 | return ret; | |
93 | ||
ed37d7f6 | 94 | reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; |
312ea07b SO |
95 | return lis3->write(lis3, CTRL_REG1, reg); |
96 | } | |
97 | ||
98 | /* Default axis mapping but it can be overwritten by platform data */ | |
2ee32144 TI |
99 | static union axis_conversion lis3lv02d_axis_map = |
100 | { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; | |
312ea07b SO |
101 | |
102 | static 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) { | |
f9deb41f SO |
109 | /* Regulator control is optional */ |
110 | if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL) | |
111 | lis3_dev.reg_ctrl = lis3_reg_ctrl; | |
112 | ||
f10a5407 SO |
113 | 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 | ||
312ea07b SO |
118 | 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 | ||
f9deb41f SO |
134 | 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 | ||
312ea07b SO |
144 | 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; | |
2a346996 | 151 | lis3_dev.pm_dev = &client->dev; |
312ea07b SO |
152 | |
153 | i2c_set_clientdata(client, &lis3_dev); | |
f9deb41f SO |
154 | |
155 | /* Provide power over the init call */ | |
156 | if (lis3_dev.reg_ctrl) | |
157 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); | |
158 | ||
312ea07b | 159 | ret = lis3lv02d_init_device(&lis3_dev); |
f9deb41f SO |
160 | |
161 | if (lis3_dev.reg_ctrl) | |
162 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); | |
b11e7b3f SO |
163 | |
164 | if (ret == 0) | |
165 | return 0; | |
312ea07b | 166 | fail: |
b11e7b3f SO |
167 | if (pdata && pdata->release_resources) |
168 | pdata->release_resources(); | |
312ea07b SO |
169 | return ret; |
170 | } | |
171 | ||
172 | static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client) | |
173 | { | |
f9deb41f | 174 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
312ea07b SO |
175 | 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(); | |
f9deb41f | 181 | lis3lv02d_remove_fs(&lis3_dev); |
312ea07b | 182 | |
f9deb41f SO |
183 | if (lis3_dev.reg_ctrl) |
184 | regulator_bulk_free(ARRAY_SIZE(lis3->regulators), | |
185 | lis3_dev.regulators); | |
186 | return 0; | |
312ea07b SO |
187 | } |
188 | ||
32292f49 | 189 | #ifdef CONFIG_PM_SLEEP |
2a346996 | 190 | static int lis3lv02d_i2c_suspend(struct device *dev) |
312ea07b | 191 | { |
2a346996 | 192 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
193 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
194 | ||
5facb097 | 195 | if (!lis3->pdata || !lis3->pdata->wakeup_flags) |
312ea07b SO |
196 | lis3lv02d_poweroff(lis3); |
197 | return 0; | |
198 | } | |
199 | ||
2a346996 | 200 | static int lis3lv02d_i2c_resume(struct device *dev) |
312ea07b | 201 | { |
2a346996 | 202 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
203 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
204 | ||
2a346996 SO |
205 | /* |
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)) | |
312ea07b | 212 | lis3lv02d_poweron(lis3); |
312ea07b | 213 | |
2a346996 | 214 | return 0; |
312ea07b | 215 | } |
32292f49 | 216 | #endif /* CONFIG_PM_SLEEP */ |
312ea07b | 217 | |
32292f49 | 218 | #ifdef CONFIG_PM_RUNTIME |
2a346996 SO |
219 | static 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 | ||
228 | static 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 | } | |
32292f49 | 236 | #endif /* CONFIG_PM_RUNTIME */ |
2a346996 | 237 | |
312ea07b SO |
238 | static const struct i2c_device_id lis3lv02d_id[] = { |
239 | {"lis3lv02d", 0 }, | |
240 | {} | |
241 | }; | |
242 | ||
243 | MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); | |
244 | ||
2a346996 SO |
245 | static 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 | ||
312ea07b SO |
253 | static struct i2c_driver lis3lv02d_i2c_driver = { |
254 | .driver = { | |
255 | .name = DRV_NAME, | |
256 | .owner = THIS_MODULE, | |
2a346996 | 257 | .pm = &lis3_pm_ops, |
312ea07b | 258 | }, |
312ea07b SO |
259 | .probe = lis3lv02d_i2c_probe, |
260 | .remove = __devexit_p(lis3lv02d_i2c_remove), | |
261 | .id_table = lis3lv02d_id, | |
262 | }; | |
263 | ||
264 | static int __init lis3lv02d_init(void) | |
265 | { | |
266 | return i2c_add_driver(&lis3lv02d_i2c_driver); | |
267 | } | |
268 | ||
269 | static void __exit lis3lv02d_exit(void) | |
270 | { | |
271 | i2c_del_driver(&lis3lv02d_i2c_driver); | |
272 | } | |
273 | ||
274 | MODULE_AUTHOR("Nokia Corporation"); | |
275 | MODULE_DESCRIPTION("lis3lv02d I2C interface"); | |
276 | MODULE_LICENSE("GPL"); | |
277 | ||
278 | module_init(lis3lv02d_init); | |
279 | module_exit(lis3lv02d_exit); |