1 | // SPDX-License-Identifier: GPL-2.0-only |
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> |
12 | */ |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/err.h> |
17 | #include <linux/i2c.h> |
18 | #include <linux/pm_runtime.h> |
19 | #include <linux/delay.h> |
20 | #include <linux/of.h> |
21 | #include <linux/of_platform.h> |
22 | #include <linux/of_device.h> |
23 | |
24 | #include "lis3lv02d.h" |
25 | |
26 | #define DRV_NAME "lis3lv02d_i2c" |
27 | |
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 | consumers: lis3->regulators); |
37 | } else { |
38 | ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), |
39 | consumers: lis3->regulators); |
40 | /* Chip needs time to wakeup. Not mentioned in datasheet */ |
41 | usleep_range(min: 10000, max: 20000); |
42 | } |
43 | return ret; |
44 | } |
45 | |
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(client: c, command: 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(client: c, command: reg); |
56 | return 0; |
57 | } |
58 | |
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(client: c, command: reg, length: len, values: v); |
65 | } |
66 | |
67 | static int lis3_i2c_init(struct lis3lv02d *lis3) |
68 | { |
69 | u8 reg; |
70 | int ret; |
71 | |
72 | lis3_reg_ctrl(lis3, state: LIS3_REG_ON); |
73 | |
74 | lis3->read(lis3, WHO_AM_I, ®); |
75 | if (reg != lis3->whoami) |
76 | printk(KERN_ERR "lis3: power on failure\n" ); |
77 | |
78 | /* power up the device */ |
79 | ret = lis3->read(lis3, CTRL_REG1, ®); |
80 | if (ret < 0) |
81 | return ret; |
82 | |
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 | |
88 | return lis3->write(lis3, CTRL_REG1, reg); |
89 | } |
90 | |
91 | /* Default axis mapping but it can be overwritten by platform data */ |
92 | static union axis_conversion lis3lv02d_axis_map = |
93 | { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; |
94 | |
95 | #ifdef CONFIG_OF |
96 | static const struct of_device_id lis3lv02d_i2c_dt_ids[] = { |
97 | { .compatible = "st,lis3lv02d" }, |
98 | {} |
99 | }; |
100 | MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); |
101 | #endif |
102 | |
103 | static int lis3lv02d_i2c_probe(struct i2c_client *client) |
104 | { |
105 | int ret = 0; |
106 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; |
107 | |
108 | #ifdef CONFIG_OF |
109 | if (of_match_device(matches: lis3lv02d_i2c_dt_ids, dev: &client->dev)) { |
110 | lis3_dev.of_node = client->dev.of_node; |
111 | ret = lis3lv02d_init_dt(lis3: &lis3_dev); |
112 | if (ret) |
113 | return ret; |
114 | pdata = lis3_dev.pdata; |
115 | } |
116 | #endif |
117 | |
118 | if (pdata) { |
119 | if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && |
120 | (i2c_check_functionality(adap: client->adapter, |
121 | I2C_FUNC_SMBUS_I2C_BLOCK))) |
122 | lis3_dev.blkread = lis3_i2c_blockread; |
123 | |
124 | if (pdata->axis_x) |
125 | lis3lv02d_axis_map.x = pdata->axis_x; |
126 | |
127 | if (pdata->axis_y) |
128 | lis3lv02d_axis_map.y = pdata->axis_y; |
129 | |
130 | if (pdata->axis_z) |
131 | lis3lv02d_axis_map.z = pdata->axis_z; |
132 | |
133 | if (pdata->setup_resources) |
134 | ret = pdata->setup_resources(); |
135 | |
136 | if (ret) |
137 | goto fail; |
138 | } |
139 | |
140 | lis3_dev.regulators[0].supply = reg_vdd; |
141 | lis3_dev.regulators[1].supply = reg_vdd_io; |
142 | ret = regulator_bulk_get(dev: &client->dev, |
143 | ARRAY_SIZE(lis3_dev.regulators), |
144 | consumers: lis3_dev.regulators); |
145 | if (ret < 0) |
146 | goto fail; |
147 | |
148 | lis3_dev.pdata = pdata; |
149 | lis3_dev.bus_priv = client; |
150 | lis3_dev.init = lis3_i2c_init; |
151 | lis3_dev.read = lis3_i2c_read; |
152 | lis3_dev.write = lis3_i2c_write; |
153 | lis3_dev.reg_ctrl = lis3_reg_ctrl; |
154 | lis3_dev.irq = client->irq; |
155 | lis3_dev.ac = lis3lv02d_axis_map; |
156 | lis3_dev.pm_dev = &client->dev; |
157 | |
158 | i2c_set_clientdata(client, data: &lis3_dev); |
159 | |
160 | /* Provide power over the init call */ |
161 | lis3_reg_ctrl(lis3: &lis3_dev, state: LIS3_REG_ON); |
162 | |
163 | ret = lis3lv02d_init_device(lis3: &lis3_dev); |
164 | |
165 | lis3_reg_ctrl(lis3: &lis3_dev, state: LIS3_REG_OFF); |
166 | |
167 | if (ret) |
168 | goto fail2; |
169 | return 0; |
170 | |
171 | fail2: |
172 | regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), |
173 | consumers: lis3_dev.regulators); |
174 | fail: |
175 | if (pdata && pdata->release_resources) |
176 | pdata->release_resources(); |
177 | return ret; |
178 | } |
179 | |
180 | static void lis3lv02d_i2c_remove(struct i2c_client *client) |
181 | { |
182 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
183 | struct lis3lv02d_platform_data *pdata = client->dev.platform_data; |
184 | |
185 | if (pdata && pdata->release_resources) |
186 | pdata->release_resources(); |
187 | |
188 | lis3lv02d_joystick_disable(lis3); |
189 | lis3lv02d_remove_fs(lis3: &lis3_dev); |
190 | |
191 | regulator_bulk_free(ARRAY_SIZE(lis3->regulators), |
192 | consumers: lis3_dev.regulators); |
193 | } |
194 | |
195 | #ifdef CONFIG_PM_SLEEP |
196 | static int lis3lv02d_i2c_suspend(struct device *dev) |
197 | { |
198 | struct i2c_client *client = to_i2c_client(dev); |
199 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
200 | |
201 | /* Turn on for wakeup if turned off by runtime suspend */ |
202 | if (lis3->pdata && lis3->pdata->wakeup_flags) { |
203 | if (pm_runtime_suspended(dev)) |
204 | lis3lv02d_poweron(lis3); |
205 | /* For non wakeup turn off if not already turned off by runtime suspend */ |
206 | } else if (!pm_runtime_suspended(dev)) |
207 | lis3lv02d_poweroff(lis3); |
208 | |
209 | return 0; |
210 | } |
211 | |
212 | static int lis3lv02d_i2c_resume(struct device *dev) |
213 | { |
214 | struct i2c_client *client = to_i2c_client(dev); |
215 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
216 | |
217 | /* Turn back off if turned on for wakeup and runtime suspended*/ |
218 | if (lis3->pdata && lis3->pdata->wakeup_flags) { |
219 | if (pm_runtime_suspended(dev)) |
220 | lis3lv02d_poweroff(lis3); |
221 | /* For non wakeup turn back on if not runtime suspended */ |
222 | } else if (!pm_runtime_suspended(dev)) |
223 | lis3lv02d_poweron(lis3); |
224 | |
225 | return 0; |
226 | } |
227 | #endif /* CONFIG_PM_SLEEP */ |
228 | |
229 | #ifdef CONFIG_PM |
230 | static int lis3_i2c_runtime_suspend(struct device *dev) |
231 | { |
232 | struct i2c_client *client = to_i2c_client(dev); |
233 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
234 | |
235 | lis3lv02d_poweroff(lis3); |
236 | return 0; |
237 | } |
238 | |
239 | static int lis3_i2c_runtime_resume(struct device *dev) |
240 | { |
241 | struct i2c_client *client = to_i2c_client(dev); |
242 | struct lis3lv02d *lis3 = i2c_get_clientdata(client); |
243 | |
244 | lis3lv02d_poweron(lis3); |
245 | return 0; |
246 | } |
247 | #endif /* CONFIG_PM */ |
248 | |
249 | static const struct i2c_device_id lis3lv02d_id[] = { |
250 | {"lis3lv02d" , LIS3LV02D}, |
251 | {"lis331dlh" , LIS331DLH}, |
252 | {} |
253 | }; |
254 | |
255 | MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); |
256 | |
257 | static const struct dev_pm_ops lis3_pm_ops = { |
258 | SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, |
259 | lis3lv02d_i2c_resume) |
260 | SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, |
261 | lis3_i2c_runtime_resume, |
262 | NULL) |
263 | }; |
264 | |
265 | static struct i2c_driver lis3lv02d_i2c_driver = { |
266 | .driver = { |
267 | .name = DRV_NAME, |
268 | .pm = &lis3_pm_ops, |
269 | .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), |
270 | }, |
271 | .probe = lis3lv02d_i2c_probe, |
272 | .remove = lis3lv02d_i2c_remove, |
273 | .id_table = lis3lv02d_id, |
274 | }; |
275 | |
276 | module_i2c_driver(lis3lv02d_i2c_driver); |
277 | |
278 | MODULE_AUTHOR("Nokia Corporation" ); |
279 | MODULE_DESCRIPTION("lis3lv02d I2C interface" ); |
280 | MODULE_LICENSE("GPL" ); |
281 | |