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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> |
5dc2db05 AC |
34 | #include <linux/of.h> |
35 | #include <linux/of_platform.h> | |
36 | #include <linux/of_device.h> | |
37 | ||
312ea07b SO |
38 | #include "lis3lv02d.h" |
39 | ||
ff606677 | 40 | #define DRV_NAME "lis3lv02d_i2c" |
312ea07b | 41 | |
f9deb41f SO |
42 | static const char reg_vdd[] = "Vdd"; |
43 | static const char reg_vdd_io[] = "Vdd_IO"; | |
44 | ||
45 | static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state) | |
46 | { | |
47 | int ret; | |
48 | if (state == LIS3_REG_OFF) { | |
49 | ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators), | |
50 | lis3->regulators); | |
51 | } else { | |
52 | ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), | |
53 | lis3->regulators); | |
54 | /* Chip needs time to wakeup. Not mentioned in datasheet */ | |
55 | usleep_range(10000, 20000); | |
56 | } | |
57 | return ret; | |
58 | } | |
59 | ||
312ea07b SO |
60 | static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value) |
61 | { | |
62 | struct i2c_client *c = lis3->bus_priv; | |
63 | return i2c_smbus_write_byte_data(c, reg, value); | |
64 | } | |
65 | ||
66 | static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v) | |
67 | { | |
68 | struct i2c_client *c = lis3->bus_priv; | |
69 | *v = i2c_smbus_read_byte_data(c, reg); | |
70 | return 0; | |
71 | } | |
72 | ||
f10a5407 SO |
73 | static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len, |
74 | u8 *v) | |
75 | { | |
76 | struct i2c_client *c = lis3->bus_priv; | |
77 | reg |= (1 << 7); /* 7th bit enables address auto incrementation */ | |
78 | return i2c_smbus_read_i2c_block_data(c, reg, len, v); | |
79 | } | |
80 | ||
312ea07b SO |
81 | static int lis3_i2c_init(struct lis3lv02d *lis3) |
82 | { | |
83 | u8 reg; | |
84 | int ret; | |
85 | ||
ec400c9f | 86 | lis3_reg_ctrl(lis3, LIS3_REG_ON); |
f9deb41f SO |
87 | |
88 | lis3->read(lis3, WHO_AM_I, ®); | |
89 | if (reg != lis3->whoami) | |
90 | printk(KERN_ERR "lis3: power on failure\n"); | |
91 | ||
312ea07b SO |
92 | /* power up the device */ |
93 | ret = lis3->read(lis3, CTRL_REG1, ®); | |
94 | if (ret < 0) | |
95 | return ret; | |
96 | ||
0bf5a8be AC |
97 | if (lis3->whoami == WAI_3DLH) |
98 | reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
99 | else | |
100 | reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
101 | ||
312ea07b SO |
102 | return lis3->write(lis3, CTRL_REG1, reg); |
103 | } | |
104 | ||
105 | /* Default axis mapping but it can be overwritten by platform data */ | |
2ee32144 TI |
106 | static union axis_conversion lis3lv02d_axis_map = |
107 | { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; | |
312ea07b | 108 | |
5dc2db05 AC |
109 | #ifdef CONFIG_OF |
110 | static struct of_device_id lis3lv02d_i2c_dt_ids[] = { | |
111 | { .compatible = "st,lis3lv02d" }, | |
112 | {} | |
113 | }; | |
114 | MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); | |
115 | #endif | |
116 | ||
312ea07b SO |
117 | static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client, |
118 | const struct i2c_device_id *id) | |
119 | { | |
120 | int ret = 0; | |
121 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; | |
122 | ||
5dc2db05 AC |
123 | #ifdef CONFIG_OF |
124 | if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) { | |
125 | lis3_dev.of_node = client->dev.of_node; | |
126 | ret = lis3lv02d_init_dt(&lis3_dev); | |
127 | if (ret) | |
128 | return ret; | |
129 | pdata = lis3_dev.pdata; | |
130 | } | |
131 | #endif | |
132 | ||
312ea07b | 133 | if (pdata) { |
f10a5407 SO |
134 | if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && |
135 | (i2c_check_functionality(client->adapter, | |
136 | I2C_FUNC_SMBUS_I2C_BLOCK))) | |
137 | lis3_dev.blkread = lis3_i2c_blockread; | |
138 | ||
312ea07b SO |
139 | if (pdata->axis_x) |
140 | lis3lv02d_axis_map.x = pdata->axis_x; | |
141 | ||
142 | if (pdata->axis_y) | |
143 | lis3lv02d_axis_map.y = pdata->axis_y; | |
144 | ||
145 | if (pdata->axis_z) | |
146 | lis3lv02d_axis_map.z = pdata->axis_z; | |
147 | ||
148 | if (pdata->setup_resources) | |
149 | ret = pdata->setup_resources(); | |
150 | ||
151 | if (ret) | |
152 | goto fail; | |
153 | } | |
154 | ||
ec400c9f MB |
155 | lis3_dev.regulators[0].supply = reg_vdd; |
156 | lis3_dev.regulators[1].supply = reg_vdd_io; | |
157 | ret = regulator_bulk_get(&client->dev, | |
158 | ARRAY_SIZE(lis3_dev.regulators), | |
159 | lis3_dev.regulators); | |
160 | if (ret < 0) | |
161 | goto fail; | |
f9deb41f | 162 | |
312ea07b SO |
163 | lis3_dev.pdata = pdata; |
164 | lis3_dev.bus_priv = client; | |
165 | lis3_dev.init = lis3_i2c_init; | |
166 | lis3_dev.read = lis3_i2c_read; | |
167 | lis3_dev.write = lis3_i2c_write; | |
168 | lis3_dev.irq = client->irq; | |
169 | lis3_dev.ac = lis3lv02d_axis_map; | |
2a346996 | 170 | lis3_dev.pm_dev = &client->dev; |
312ea07b SO |
171 | |
172 | i2c_set_clientdata(client, &lis3_dev); | |
f9deb41f SO |
173 | |
174 | /* Provide power over the init call */ | |
ec400c9f | 175 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); |
f9deb41f | 176 | |
312ea07b | 177 | ret = lis3lv02d_init_device(&lis3_dev); |
f9deb41f | 178 | |
ec400c9f | 179 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); |
b11e7b3f | 180 | |
0021586b ÉP |
181 | if (ret) |
182 | goto fail2; | |
183 | return 0; | |
184 | ||
185 | fail2: | |
186 | regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), | |
187 | lis3_dev.regulators); | |
312ea07b | 188 | fail: |
b11e7b3f SO |
189 | if (pdata && pdata->release_resources) |
190 | pdata->release_resources(); | |
312ea07b SO |
191 | return ret; |
192 | } | |
193 | ||
194 | static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client) | |
195 | { | |
f9deb41f | 196 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
312ea07b SO |
197 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; |
198 | ||
199 | if (pdata && pdata->release_resources) | |
200 | pdata->release_resources(); | |
201 | ||
e1e5687d | 202 | lis3lv02d_joystick_disable(lis3); |
f9deb41f | 203 | lis3lv02d_remove_fs(&lis3_dev); |
312ea07b | 204 | |
ec400c9f MB |
205 | regulator_bulk_free(ARRAY_SIZE(lis3->regulators), |
206 | lis3_dev.regulators); | |
f9deb41f | 207 | return 0; |
312ea07b SO |
208 | } |
209 | ||
32292f49 | 210 | #ifdef CONFIG_PM_SLEEP |
2a346996 | 211 | static int lis3lv02d_i2c_suspend(struct device *dev) |
312ea07b | 212 | { |
2a346996 | 213 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
214 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
215 | ||
5facb097 | 216 | if (!lis3->pdata || !lis3->pdata->wakeup_flags) |
312ea07b SO |
217 | lis3lv02d_poweroff(lis3); |
218 | return 0; | |
219 | } | |
220 | ||
2a346996 | 221 | static int lis3lv02d_i2c_resume(struct device *dev) |
312ea07b | 222 | { |
2a346996 | 223 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
224 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
225 | ||
2a346996 SO |
226 | /* |
227 | * pm_runtime documentation says that devices should always | |
228 | * be powered on at resume. Pm_runtime turns them off after system | |
229 | * wide resume is complete. | |
230 | */ | |
231 | if (!lis3->pdata || !lis3->pdata->wakeup_flags || | |
232 | pm_runtime_suspended(dev)) | |
312ea07b | 233 | lis3lv02d_poweron(lis3); |
312ea07b | 234 | |
2a346996 | 235 | return 0; |
312ea07b | 236 | } |
32292f49 | 237 | #endif /* CONFIG_PM_SLEEP */ |
312ea07b | 238 | |
32292f49 | 239 | #ifdef CONFIG_PM_RUNTIME |
2a346996 SO |
240 | static int lis3_i2c_runtime_suspend(struct device *dev) |
241 | { | |
242 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
243 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); | |
244 | ||
245 | lis3lv02d_poweroff(lis3); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static int lis3_i2c_runtime_resume(struct device *dev) | |
250 | { | |
251 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
252 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); | |
253 | ||
254 | lis3lv02d_poweron(lis3); | |
255 | return 0; | |
256 | } | |
32292f49 | 257 | #endif /* CONFIG_PM_RUNTIME */ |
2a346996 | 258 | |
312ea07b | 259 | static const struct i2c_device_id lis3lv02d_id[] = { |
e2b2ed83 | 260 | {"lis3lv02d", LIS3LV02D}, |
0bf5a8be | 261 | {"lis331dlh", LIS331DLH}, |
312ea07b SO |
262 | {} |
263 | }; | |
264 | ||
265 | MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); | |
266 | ||
2a346996 SO |
267 | static const struct dev_pm_ops lis3_pm_ops = { |
268 | SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, | |
269 | lis3lv02d_i2c_resume) | |
270 | SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, | |
271 | lis3_i2c_runtime_resume, | |
272 | NULL) | |
273 | }; | |
274 | ||
312ea07b SO |
275 | static struct i2c_driver lis3lv02d_i2c_driver = { |
276 | .driver = { | |
277 | .name = DRV_NAME, | |
278 | .owner = THIS_MODULE, | |
2a346996 | 279 | .pm = &lis3_pm_ops, |
5dc2db05 | 280 | .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), |
312ea07b | 281 | }, |
312ea07b | 282 | .probe = lis3lv02d_i2c_probe, |
2d6bed9c | 283 | .remove = lis3lv02d_i2c_remove, |
312ea07b SO |
284 | .id_table = lis3lv02d_id, |
285 | }; | |
286 | ||
a64fe2ed | 287 | module_i2c_driver(lis3lv02d_i2c_driver); |
312ea07b SO |
288 | |
289 | MODULE_AUTHOR("Nokia Corporation"); | |
290 | MODULE_DESCRIPTION("lis3lv02d I2C interface"); | |
291 | MODULE_LICENSE("GPL"); |