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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
312ea07b SO |
2 | /* |
3 | * drivers/hwmon/lis3lv02d_i2c.c | |
4 | * | |
5 | * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer. | |
6 | * Driver is based on corresponding SPI driver written by Daniel Mack | |
7 | * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ). | |
8 | * | |
9 | * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). | |
10 | * | |
11 | * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> | |
312ea07b SO |
12 | */ |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
312ea07b SO |
16 | #include <linux/err.h> |
17 | #include <linux/i2c.h> | |
2a346996 | 18 | #include <linux/pm_runtime.h> |
f9deb41f | 19 | #include <linux/delay.h> |
5dc2db05 AC |
20 | #include <linux/of.h> |
21 | #include <linux/of_platform.h> | |
22 | #include <linux/of_device.h> | |
23 | ||
312ea07b SO |
24 | #include "lis3lv02d.h" |
25 | ||
ff606677 | 26 | #define DRV_NAME "lis3lv02d_i2c" |
312ea07b | 27 | |
f9deb41f SO |
28 | static const char reg_vdd[] = "Vdd"; |
29 | static const char reg_vdd_io[] = "Vdd_IO"; | |
30 | ||
31 | static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state) | |
32 | { | |
33 | int ret; | |
34 | if (state == LIS3_REG_OFF) { | |
35 | ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators), | |
36 | lis3->regulators); | |
37 | } else { | |
38 | ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), | |
39 | lis3->regulators); | |
40 | /* Chip needs time to wakeup. Not mentioned in datasheet */ | |
41 | usleep_range(10000, 20000); | |
42 | } | |
43 | return ret; | |
44 | } | |
45 | ||
312ea07b SO |
46 | static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value) |
47 | { | |
48 | struct i2c_client *c = lis3->bus_priv; | |
49 | return i2c_smbus_write_byte_data(c, reg, value); | |
50 | } | |
51 | ||
52 | static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v) | |
53 | { | |
54 | struct i2c_client *c = lis3->bus_priv; | |
55 | *v = i2c_smbus_read_byte_data(c, reg); | |
56 | return 0; | |
57 | } | |
58 | ||
f10a5407 SO |
59 | static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len, |
60 | u8 *v) | |
61 | { | |
62 | struct i2c_client *c = lis3->bus_priv; | |
63 | reg |= (1 << 7); /* 7th bit enables address auto incrementation */ | |
64 | return i2c_smbus_read_i2c_block_data(c, reg, len, v); | |
65 | } | |
66 | ||
312ea07b SO |
67 | static int lis3_i2c_init(struct lis3lv02d *lis3) |
68 | { | |
69 | u8 reg; | |
70 | int ret; | |
71 | ||
ec400c9f | 72 | lis3_reg_ctrl(lis3, LIS3_REG_ON); |
f9deb41f SO |
73 | |
74 | lis3->read(lis3, WHO_AM_I, ®); | |
75 | if (reg != lis3->whoami) | |
76 | printk(KERN_ERR "lis3: power on failure\n"); | |
77 | ||
312ea07b SO |
78 | /* power up the device */ |
79 | ret = lis3->read(lis3, CTRL_REG1, ®); | |
80 | if (ret < 0) | |
81 | return ret; | |
82 | ||
0bf5a8be AC |
83 | if (lis3->whoami == WAI_3DLH) |
84 | reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
85 | else | |
86 | reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; | |
87 | ||
312ea07b SO |
88 | return lis3->write(lis3, CTRL_REG1, reg); |
89 | } | |
90 | ||
91 | /* Default axis mapping but it can be overwritten by platform data */ | |
2ee32144 TI |
92 | static union axis_conversion lis3lv02d_axis_map = |
93 | { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; | |
312ea07b | 94 | |
5dc2db05 | 95 | #ifdef CONFIG_OF |
6893d9b5 | 96 | static const struct of_device_id lis3lv02d_i2c_dt_ids[] = { |
5dc2db05 AC |
97 | { .compatible = "st,lis3lv02d" }, |
98 | {} | |
99 | }; | |
100 | MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); | |
101 | #endif | |
102 | ||
80c8ae28 | 103 | static int lis3lv02d_i2c_probe(struct i2c_client *client, |
312ea07b SO |
104 | const struct i2c_device_id *id) |
105 | { | |
106 | int ret = 0; | |
107 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; | |
108 | ||
5dc2db05 AC |
109 | #ifdef CONFIG_OF |
110 | if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) { | |
111 | lis3_dev.of_node = client->dev.of_node; | |
112 | ret = lis3lv02d_init_dt(&lis3_dev); | |
113 | if (ret) | |
114 | return ret; | |
115 | pdata = lis3_dev.pdata; | |
116 | } | |
117 | #endif | |
118 | ||
312ea07b | 119 | if (pdata) { |
f10a5407 SO |
120 | if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && |
121 | (i2c_check_functionality(client->adapter, | |
122 | I2C_FUNC_SMBUS_I2C_BLOCK))) | |
123 | lis3_dev.blkread = lis3_i2c_blockread; | |
124 | ||
312ea07b SO |
125 | if (pdata->axis_x) |
126 | lis3lv02d_axis_map.x = pdata->axis_x; | |
127 | ||
128 | if (pdata->axis_y) | |
129 | lis3lv02d_axis_map.y = pdata->axis_y; | |
130 | ||
131 | if (pdata->axis_z) | |
132 | lis3lv02d_axis_map.z = pdata->axis_z; | |
133 | ||
134 | if (pdata->setup_resources) | |
135 | ret = pdata->setup_resources(); | |
136 | ||
137 | if (ret) | |
138 | goto fail; | |
139 | } | |
140 | ||
ec400c9f MB |
141 | lis3_dev.regulators[0].supply = reg_vdd; |
142 | lis3_dev.regulators[1].supply = reg_vdd_io; | |
143 | ret = regulator_bulk_get(&client->dev, | |
144 | ARRAY_SIZE(lis3_dev.regulators), | |
145 | lis3_dev.regulators); | |
146 | if (ret < 0) | |
147 | goto fail; | |
f9deb41f | 148 | |
312ea07b SO |
149 | lis3_dev.pdata = pdata; |
150 | lis3_dev.bus_priv = client; | |
151 | lis3_dev.init = lis3_i2c_init; | |
152 | lis3_dev.read = lis3_i2c_read; | |
153 | lis3_dev.write = lis3_i2c_write; | |
154 | lis3_dev.irq = client->irq; | |
155 | lis3_dev.ac = lis3lv02d_axis_map; | |
2a346996 | 156 | lis3_dev.pm_dev = &client->dev; |
312ea07b SO |
157 | |
158 | i2c_set_clientdata(client, &lis3_dev); | |
f9deb41f SO |
159 | |
160 | /* Provide power over the init call */ | |
ec400c9f | 161 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); |
f9deb41f | 162 | |
312ea07b | 163 | ret = lis3lv02d_init_device(&lis3_dev); |
f9deb41f | 164 | |
ec400c9f | 165 | lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); |
b11e7b3f | 166 | |
0021586b ÉP |
167 | if (ret) |
168 | goto fail2; | |
169 | return 0; | |
170 | ||
171 | fail2: | |
172 | regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), | |
173 | lis3_dev.regulators); | |
312ea07b | 174 | fail: |
b11e7b3f SO |
175 | if (pdata && pdata->release_resources) |
176 | pdata->release_resources(); | |
312ea07b SO |
177 | return ret; |
178 | } | |
179 | ||
486a5c28 | 180 | static int lis3lv02d_i2c_remove(struct i2c_client *client) |
312ea07b | 181 | { |
f9deb41f | 182 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
312ea07b SO |
183 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; |
184 | ||
185 | if (pdata && pdata->release_resources) | |
186 | pdata->release_resources(); | |
187 | ||
e1e5687d | 188 | lis3lv02d_joystick_disable(lis3); |
f9deb41f | 189 | lis3lv02d_remove_fs(&lis3_dev); |
312ea07b | 190 | |
ec400c9f MB |
191 | regulator_bulk_free(ARRAY_SIZE(lis3->regulators), |
192 | lis3_dev.regulators); | |
f9deb41f | 193 | return 0; |
312ea07b SO |
194 | } |
195 | ||
32292f49 | 196 | #ifdef CONFIG_PM_SLEEP |
2a346996 | 197 | static int lis3lv02d_i2c_suspend(struct device *dev) |
312ea07b | 198 | { |
8c99d8e6 | 199 | struct i2c_client *client = to_i2c_client(dev); |
312ea07b SO |
200 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
201 | ||
5facb097 | 202 | if (!lis3->pdata || !lis3->pdata->wakeup_flags) |
312ea07b SO |
203 | lis3lv02d_poweroff(lis3); |
204 | return 0; | |
205 | } | |
206 | ||
2a346996 | 207 | static int lis3lv02d_i2c_resume(struct device *dev) |
312ea07b | 208 | { |
8c99d8e6 | 209 | struct i2c_client *client = to_i2c_client(dev); |
312ea07b SO |
210 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
211 | ||
2a346996 SO |
212 | /* |
213 | * pm_runtime documentation says that devices should always | |
214 | * be powered on at resume. Pm_runtime turns them off after system | |
215 | * wide resume is complete. | |
216 | */ | |
217 | if (!lis3->pdata || !lis3->pdata->wakeup_flags || | |
218 | pm_runtime_suspended(dev)) | |
312ea07b | 219 | lis3lv02d_poweron(lis3); |
312ea07b | 220 | |
2a346996 | 221 | return 0; |
312ea07b | 222 | } |
32292f49 | 223 | #endif /* CONFIG_PM_SLEEP */ |
312ea07b | 224 | |
bbd6d050 | 225 | #ifdef CONFIG_PM |
2a346996 SO |
226 | static int lis3_i2c_runtime_suspend(struct device *dev) |
227 | { | |
8c99d8e6 | 228 | struct i2c_client *client = to_i2c_client(dev); |
2a346996 SO |
229 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
230 | ||
231 | lis3lv02d_poweroff(lis3); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int lis3_i2c_runtime_resume(struct device *dev) | |
236 | { | |
8c99d8e6 | 237 | struct i2c_client *client = to_i2c_client(dev); |
2a346996 SO |
238 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
239 | ||
240 | lis3lv02d_poweron(lis3); | |
241 | return 0; | |
242 | } | |
bbd6d050 | 243 | #endif /* CONFIG_PM */ |
2a346996 | 244 | |
312ea07b | 245 | static const struct i2c_device_id lis3lv02d_id[] = { |
e2b2ed83 | 246 | {"lis3lv02d", LIS3LV02D}, |
0bf5a8be | 247 | {"lis331dlh", LIS331DLH}, |
312ea07b SO |
248 | {} |
249 | }; | |
250 | ||
251 | MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); | |
252 | ||
2a346996 SO |
253 | static const struct dev_pm_ops lis3_pm_ops = { |
254 | SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, | |
255 | lis3lv02d_i2c_resume) | |
256 | SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, | |
257 | lis3_i2c_runtime_resume, | |
258 | NULL) | |
259 | }; | |
260 | ||
312ea07b SO |
261 | static struct i2c_driver lis3lv02d_i2c_driver = { |
262 | .driver = { | |
263 | .name = DRV_NAME, | |
2a346996 | 264 | .pm = &lis3_pm_ops, |
5dc2db05 | 265 | .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), |
312ea07b | 266 | }, |
312ea07b | 267 | .probe = lis3lv02d_i2c_probe, |
2d6bed9c | 268 | .remove = lis3lv02d_i2c_remove, |
312ea07b SO |
269 | .id_table = lis3lv02d_id, |
270 | }; | |
271 | ||
a64fe2ed | 272 | module_i2c_driver(lis3lv02d_i2c_driver); |
312ea07b SO |
273 | |
274 | MODULE_AUTHOR("Nokia Corporation"); | |
275 | MODULE_DESCRIPTION("lis3lv02d I2C interface"); | |
276 | MODULE_LICENSE("GPL"); |