Loading...
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>
32#include <linux/pm_runtime.h>
33#include <linux/delay.h>
34#include "lis3lv02d.h"
35
36#define DRV_NAME "lis3lv02d_i2c"
37
38static const char reg_vdd[] = "Vdd";
39static const char reg_vdd_io[] = "Vdd_IO";
40
41static 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
56static 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
62static 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
69static 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
77static int lis3_i2c_init(struct lis3lv02d *lis3)
78{
79 u8 reg;
80 int ret;
81
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
89 /* power up the device */
90 ret = lis3->read(lis3, CTRL_REG1, ®);
91 if (ret < 0)
92 return ret;
93
94 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
95 return lis3->write(lis3, CTRL_REG1, reg);
96}
97
98/* Default axis mapping but it can be overwritten by platform data */
99static union axis_conversion lis3lv02d_axis_map =
100 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
101
102static 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) {
109 /* Regulator control is optional */
110 if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
111 lis3_dev.reg_ctrl = lis3_reg_ctrl;
112
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
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
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
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;
151 lis3_dev.pm_dev = &client->dev;
152
153 i2c_set_clientdata(client, &lis3_dev);
154
155 /* Provide power over the init call */
156 if (lis3_dev.reg_ctrl)
157 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
158
159 ret = lis3lv02d_init_device(&lis3_dev);
160
161 if (lis3_dev.reg_ctrl)
162 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
163
164 if (ret == 0)
165 return 0;
166fail:
167 if (pdata && pdata->release_resources)
168 pdata->release_resources();
169 return ret;
170}
171
172static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
173{
174 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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();
181 lis3lv02d_remove_fs(&lis3_dev);
182
183 if (lis3_dev.reg_ctrl)
184 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
185 lis3_dev.regulators);
186 return 0;
187}
188
189#ifdef CONFIG_PM_SLEEP
190static int lis3lv02d_i2c_suspend(struct device *dev)
191{
192 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
193 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
194
195 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
196 lis3lv02d_poweroff(lis3);
197 return 0;
198}
199
200static int lis3lv02d_i2c_resume(struct device *dev)
201{
202 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
203 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
204
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))
212 lis3lv02d_poweron(lis3);
213
214 return 0;
215}
216#endif /* CONFIG_PM_SLEEP */
217
218#ifdef CONFIG_PM_RUNTIME
219static 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
228static 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}
236#endif /* CONFIG_PM_RUNTIME */
237
238static const struct i2c_device_id lis3lv02d_id[] = {
239 {"lis3lv02d", 0 },
240 {}
241};
242
243MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
244
245static 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
253static struct i2c_driver lis3lv02d_i2c_driver = {
254 .driver = {
255 .name = DRV_NAME,
256 .owner = THIS_MODULE,
257 .pm = &lis3_pm_ops,
258 },
259 .probe = lis3lv02d_i2c_probe,
260 .remove = __devexit_p(lis3lv02d_i2c_remove),
261 .id_table = lis3lv02d_id,
262};
263
264static int __init lis3lv02d_init(void)
265{
266 return i2c_add_driver(&lis3lv02d_i2c_driver);
267}
268
269static void __exit lis3lv02d_exit(void)
270{
271 i2c_del_driver(&lis3lv02d_i2c_driver);
272}
273
274MODULE_AUTHOR("Nokia Corporation");
275MODULE_DESCRIPTION("lis3lv02d I2C interface");
276MODULE_LICENSE("GPL");
277
278module_init(lis3lv02d_init);
279module_exit(lis3lv02d_exit);
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
28static const char reg_vdd[] = "Vdd";
29static const char reg_vdd_io[] = "Vdd_IO";
30
31static 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
46static 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
52static 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
59static 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
67static int lis3_i2c_init(struct lis3lv02d *lis3)
68{
69 u8 reg;
70 int ret;
71
72 lis3_reg_ctrl(lis3, 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 */
92static union axis_conversion lis3lv02d_axis_map =
93 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
94
95#ifdef CONFIG_OF
96static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
97 { .compatible = "st,lis3lv02d" },
98 {}
99};
100MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
101#endif
102
103static 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(lis3lv02d_i2c_dt_ids, &client->dev)) {
110 lis3_dev.of_node = client->dev.of_node;
111 ret = lis3lv02d_init_dt(&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(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(&client->dev,
143 ARRAY_SIZE(lis3_dev.regulators),
144 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.irq = client->irq;
154 lis3_dev.ac = lis3lv02d_axis_map;
155 lis3_dev.pm_dev = &client->dev;
156
157 i2c_set_clientdata(client, &lis3_dev);
158
159 /* Provide power over the init call */
160 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
161
162 ret = lis3lv02d_init_device(&lis3_dev);
163
164 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
165
166 if (ret)
167 goto fail2;
168 return 0;
169
170fail2:
171 regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
172 lis3_dev.regulators);
173fail:
174 if (pdata && pdata->release_resources)
175 pdata->release_resources();
176 return ret;
177}
178
179static void lis3lv02d_i2c_remove(struct i2c_client *client)
180{
181 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
182 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
183
184 if (pdata && pdata->release_resources)
185 pdata->release_resources();
186
187 lis3lv02d_joystick_disable(lis3);
188 lis3lv02d_remove_fs(&lis3_dev);
189
190 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
191 lis3_dev.regulators);
192}
193
194#ifdef CONFIG_PM_SLEEP
195static int lis3lv02d_i2c_suspend(struct device *dev)
196{
197 struct i2c_client *client = to_i2c_client(dev);
198 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
199
200 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
201 lis3lv02d_poweroff(lis3);
202 return 0;
203}
204
205static int lis3lv02d_i2c_resume(struct device *dev)
206{
207 struct i2c_client *client = to_i2c_client(dev);
208 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
209
210 /*
211 * pm_runtime documentation says that devices should always
212 * be powered on at resume. Pm_runtime turns them off after system
213 * wide resume is complete.
214 */
215 if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
216 pm_runtime_suspended(dev))
217 lis3lv02d_poweron(lis3);
218
219 return 0;
220}
221#endif /* CONFIG_PM_SLEEP */
222
223#ifdef CONFIG_PM
224static int lis3_i2c_runtime_suspend(struct device *dev)
225{
226 struct i2c_client *client = to_i2c_client(dev);
227 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
228
229 lis3lv02d_poweroff(lis3);
230 return 0;
231}
232
233static int lis3_i2c_runtime_resume(struct device *dev)
234{
235 struct i2c_client *client = to_i2c_client(dev);
236 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
237
238 lis3lv02d_poweron(lis3);
239 return 0;
240}
241#endif /* CONFIG_PM */
242
243static const struct i2c_device_id lis3lv02d_id[] = {
244 {"lis3lv02d", LIS3LV02D},
245 {"lis331dlh", LIS331DLH},
246 {}
247};
248
249MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
250
251static const struct dev_pm_ops lis3_pm_ops = {
252 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
253 lis3lv02d_i2c_resume)
254 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
255 lis3_i2c_runtime_resume,
256 NULL)
257};
258
259static struct i2c_driver lis3lv02d_i2c_driver = {
260 .driver = {
261 .name = DRV_NAME,
262 .pm = &lis3_pm_ops,
263 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
264 },
265 .probe_new = lis3lv02d_i2c_probe,
266 .remove = lis3lv02d_i2c_remove,
267 .id_table = lis3lv02d_id,
268};
269
270module_i2c_driver(lis3lv02d_i2c_driver);
271
272MODULE_AUTHOR("Nokia Corporation");
273MODULE_DESCRIPTION("lis3lv02d I2C interface");
274MODULE_LICENSE("GPL");