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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> | |
312ea07b SO |
29 | #include <linux/err.h> |
30 | #include <linux/i2c.h> | |
2a346996 | 31 | #include <linux/pm_runtime.h> |
f9deb41f | 32 | #include <linux/delay.h> |
5dc2db05 AC |
33 | #include <linux/of.h> |
34 | #include <linux/of_platform.h> | |
35 | #include <linux/of_device.h> | |
36 | ||
312ea07b SO |
37 | #include "lis3lv02d.h" |
38 | ||
ff606677 | 39 | #define DRV_NAME "lis3lv02d_i2c" |
312ea07b | 40 | |
f9deb41f SO |
41 | static const char reg_vdd[] = "Vdd"; |
42 | static const char reg_vdd_io[] = "Vdd_IO"; | |
43 | ||
44 | static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state) | |
45 | { | |
46 | int ret; | |
47 | if (state == LIS3_REG_OFF) { | |
48 | ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators), | |
49 | lis3->regulators); | |
50 | } else { | |
51 | ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), | |
52 | lis3->regulators); | |
53 | /* Chip needs time to wakeup. Not mentioned in datasheet */ | |
54 | usleep_range(10000, 20000); | |
55 | } | |
56 | return ret; | |
57 | } | |
58 | ||
312ea07b SO |
59 | static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value) |
60 | { | |
61 | struct i2c_client *c = lis3->bus_priv; | |
62 | return i2c_smbus_write_byte_data(c, reg, value); | |
63 | } | |
64 | ||
65 | static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v) | |
66 | { | |
67 | struct i2c_client *c = lis3->bus_priv; | |
68 | *v = i2c_smbus_read_byte_data(c, reg); | |
69 | return 0; | |
70 | } | |
71 | ||
f10a5407 SO |
72 | static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len, |
73 | u8 *v) | |
74 | { | |
75 | struct i2c_client *c = lis3->bus_priv; | |
76 | reg |= (1 << 7); /* 7th bit enables address auto incrementation */ | |
77 | return i2c_smbus_read_i2c_block_data(c, reg, len, v); | |
78 | } | |
79 | ||
312ea07b SO |
80 | static int lis3_i2c_init(struct lis3lv02d *lis3) |
81 | { | |
82 | u8 reg; | |
83 | int ret; | |
84 | ||
ec400c9f | 85 | lis3_reg_ctrl(lis3, LIS3_REG_ON); |
f9deb41f SO |
86 | |
87 | lis3->read(lis3, WHO_AM_I, ®); | |
88 | if (reg != lis3->whoami) | |
89 | printk(KERN_ERR "lis3: power on failure\n"); | |
90 | ||
312ea07b SO |
91 | /* power up the device */ |
92 | ret = lis3->read(lis3, CTRL_REG1, ®); | |
93 | if (ret < 0) | |
94 | return ret; | |
95 | ||
0bf5a8be AC |
96 | if (lis3->whoami == WAI_3DLH) |
97 | reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
98 | else | |
99 | reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
100 | ||
312ea07b SO |
101 | return lis3->write(lis3, CTRL_REG1, reg); |
102 | } | |
103 | ||
104 | /* Default axis mapping but it can be overwritten by platform data */ | |
2ee32144 TI |
105 | static union axis_conversion lis3lv02d_axis_map = |
106 | { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; | |
312ea07b | 107 | |
5dc2db05 AC |
108 | #ifdef CONFIG_OF |
109 | static struct of_device_id lis3lv02d_i2c_dt_ids[] = { | |
110 | { .compatible = "st,lis3lv02d" }, | |
111 | {} | |
112 | }; | |
113 | MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); | |
114 | #endif | |
115 | ||
80c8ae28 | 116 | static int lis3lv02d_i2c_probe(struct i2c_client *client, |
312ea07b SO |
117 | const struct i2c_device_id *id) |
118 | { | |
119 | int ret = 0; | |
120 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; | |
121 | ||
5dc2db05 AC |
122 | #ifdef CONFIG_OF |
123 | if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) { | |
124 | lis3_dev.of_node = client->dev.of_node; | |
125 | ret = lis3lv02d_init_dt(&lis3_dev); | |
126 | if (ret) | |
127 | return ret; | |
128 | pdata = lis3_dev.pdata; | |
129 | } | |
130 | #endif | |
131 | ||
312ea07b | 132 | if (pdata) { |
f10a5407 SO |
133 | if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && |
134 | (i2c_check_functionality(client->adapter, | |
135 | I2C_FUNC_SMBUS_I2C_BLOCK))) | |
136 | lis3_dev.blkread = lis3_i2c_blockread; | |
137 | ||
312ea07b SO |
138 | if (pdata->axis_x) |
139 | lis3lv02d_axis_map.x = pdata->axis_x; | |
140 | ||
141 | if (pdata->axis_y) | |
142 | lis3lv02d_axis_map.y = pdata->axis_y; | |
143 | ||
144 | if (pdata->axis_z) | |
145 | lis3lv02d_axis_map.z = pdata->axis_z; | |
146 | ||
147 | if (pdata->setup_resources) | |
148 | ret = pdata->setup_resources(); | |
149 | ||
150 | if (ret) | |
151 | goto fail; | |
152 | } | |
153 | ||
ec400c9f MB |
154 | lis3_dev.regulators[0].supply = reg_vdd; |
155 | lis3_dev.regulators[1].supply = reg_vdd_io; | |
156 | ret = regulator_bulk_get(&client->dev, | |
157 | ARRAY_SIZE(lis3_dev.regulators), | |
158 | lis3_dev.regulators); | |
159 | if (ret < 0) | |
160 | goto fail; | |
f9deb41f | 161 | |
312ea07b SO |
162 | lis3_dev.pdata = pdata; |
163 | lis3_dev.bus_priv = client; | |
164 | lis3_dev.init = lis3_i2c_init; | |
165 | lis3_dev.read = lis3_i2c_read; | |
166 | lis3_dev.write = lis3_i2c_write; | |
167 | lis3_dev.irq = client->irq; | |
168 | lis3_dev.ac = lis3lv02d_axis_map; | |
2a346996 | 169 | lis3_dev.pm_dev = &client->dev; |
312ea07b SO |
170 | |
171 | i2c_set_clientdata(client, &lis3_dev); | |
f9deb41f SO |
172 | |
173 | /* Provide power over the init call */ | |
ec400c9f | 174 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); |
f9deb41f | 175 | |
312ea07b | 176 | ret = lis3lv02d_init_device(&lis3_dev); |
f9deb41f | 177 | |
ec400c9f | 178 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); |
b11e7b3f | 179 | |
0021586b ÉP |
180 | if (ret) |
181 | goto fail2; | |
182 | return 0; | |
183 | ||
184 | fail2: | |
185 | regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), | |
186 | lis3_dev.regulators); | |
312ea07b | 187 | fail: |
b11e7b3f SO |
188 | if (pdata && pdata->release_resources) |
189 | pdata->release_resources(); | |
312ea07b SO |
190 | return ret; |
191 | } | |
192 | ||
486a5c28 | 193 | static int lis3lv02d_i2c_remove(struct i2c_client *client) |
312ea07b | 194 | { |
f9deb41f | 195 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
312ea07b SO |
196 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; |
197 | ||
198 | if (pdata && pdata->release_resources) | |
199 | pdata->release_resources(); | |
200 | ||
e1e5687d | 201 | lis3lv02d_joystick_disable(lis3); |
f9deb41f | 202 | lis3lv02d_remove_fs(&lis3_dev); |
312ea07b | 203 | |
ec400c9f MB |
204 | regulator_bulk_free(ARRAY_SIZE(lis3->regulators), |
205 | lis3_dev.regulators); | |
f9deb41f | 206 | return 0; |
312ea07b SO |
207 | } |
208 | ||
32292f49 | 209 | #ifdef CONFIG_PM_SLEEP |
2a346996 | 210 | static int lis3lv02d_i2c_suspend(struct device *dev) |
312ea07b | 211 | { |
2a346996 | 212 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
213 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
214 | ||
5facb097 | 215 | if (!lis3->pdata || !lis3->pdata->wakeup_flags) |
312ea07b SO |
216 | lis3lv02d_poweroff(lis3); |
217 | return 0; | |
218 | } | |
219 | ||
2a346996 | 220 | static int lis3lv02d_i2c_resume(struct device *dev) |
312ea07b | 221 | { |
2a346996 | 222 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
312ea07b SO |
223 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
224 | ||
2a346996 SO |
225 | /* |
226 | * pm_runtime documentation says that devices should always | |
227 | * be powered on at resume. Pm_runtime turns them off after system | |
228 | * wide resume is complete. | |
229 | */ | |
230 | if (!lis3->pdata || !lis3->pdata->wakeup_flags || | |
231 | pm_runtime_suspended(dev)) | |
312ea07b | 232 | lis3lv02d_poweron(lis3); |
312ea07b | 233 | |
2a346996 | 234 | return 0; |
312ea07b | 235 | } |
32292f49 | 236 | #endif /* CONFIG_PM_SLEEP */ |
312ea07b | 237 | |
bbd6d050 | 238 | #ifdef CONFIG_PM |
2a346996 SO |
239 | static int lis3_i2c_runtime_suspend(struct device *dev) |
240 | { | |
241 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
242 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); | |
243 | ||
244 | lis3lv02d_poweroff(lis3); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int lis3_i2c_runtime_resume(struct device *dev) | |
249 | { | |
250 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
251 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); | |
252 | ||
253 | lis3lv02d_poweron(lis3); | |
254 | return 0; | |
255 | } | |
bbd6d050 | 256 | #endif /* CONFIG_PM */ |
2a346996 | 257 | |
312ea07b | 258 | static const struct i2c_device_id lis3lv02d_id[] = { |
e2b2ed83 | 259 | {"lis3lv02d", LIS3LV02D}, |
0bf5a8be | 260 | {"lis331dlh", LIS331DLH}, |
312ea07b SO |
261 | {} |
262 | }; | |
263 | ||
264 | MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); | |
265 | ||
2a346996 SO |
266 | static const struct dev_pm_ops lis3_pm_ops = { |
267 | SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, | |
268 | lis3lv02d_i2c_resume) | |
269 | SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, | |
270 | lis3_i2c_runtime_resume, | |
271 | NULL) | |
272 | }; | |
273 | ||
312ea07b SO |
274 | static struct i2c_driver lis3lv02d_i2c_driver = { |
275 | .driver = { | |
276 | .name = DRV_NAME, | |
277 | .owner = THIS_MODULE, | |
2a346996 | 278 | .pm = &lis3_pm_ops, |
5dc2db05 | 279 | .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), |
312ea07b | 280 | }, |
312ea07b | 281 | .probe = lis3lv02d_i2c_probe, |
2d6bed9c | 282 | .remove = lis3lv02d_i2c_remove, |
312ea07b SO |
283 | .id_table = lis3lv02d_id, |
284 | }; | |
285 | ||
a64fe2ed | 286 | module_i2c_driver(lis3lv02d_i2c_driver); |
312ea07b SO |
287 | |
288 | MODULE_AUTHOR("Nokia Corporation"); | |
289 | MODULE_DESCRIPTION("lis3lv02d I2C interface"); | |
290 | MODULE_LICENSE("GPL"); |