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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/*
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/err.h>
30#include <linux/i2c.h>
31#include <linux/pm_runtime.h>
32#include <linux/delay.h>
33#include <linux/of.h>
34#include <linux/of_platform.h>
35#include <linux/of_device.h>
36
37#include "lis3lv02d.h"
38
39#define DRV_NAME "lis3lv02d_i2c"
40
41static const char reg_vdd[] = "Vdd";
42static const char reg_vdd_io[] = "Vdd_IO";
43
44static 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
59static 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
65static 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
72static 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
80static int lis3_i2c_init(struct lis3lv02d *lis3)
81{
82 u8 reg;
83 int ret;
84
85 lis3_reg_ctrl(lis3, LIS3_REG_ON);
86
87 lis3->read(lis3, WHO_AM_I, ®);
88 if (reg != lis3->whoami)
89 printk(KERN_ERR "lis3: power on failure\n");
90
91 /* power up the device */
92 ret = lis3->read(lis3, CTRL_REG1, ®);
93 if (ret < 0)
94 return ret;
95
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
101 return lis3->write(lis3, CTRL_REG1, reg);
102}
103
104/* Default axis mapping but it can be overwritten by platform data */
105static union axis_conversion lis3lv02d_axis_map =
106 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
107
108#ifdef CONFIG_OF
109static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
110 { .compatible = "st,lis3lv02d" },
111 {}
112};
113MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
114#endif
115
116static int lis3lv02d_i2c_probe(struct i2c_client *client,
117 const struct i2c_device_id *id)
118{
119 int ret = 0;
120 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
121
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
132 if (pdata) {
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
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
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;
161
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;
169 lis3_dev.pm_dev = &client->dev;
170
171 i2c_set_clientdata(client, &lis3_dev);
172
173 /* Provide power over the init call */
174 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
175
176 ret = lis3lv02d_init_device(&lis3_dev);
177
178 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
179
180 if (ret)
181 goto fail2;
182 return 0;
183
184fail2:
185 regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
186 lis3_dev.regulators);
187fail:
188 if (pdata && pdata->release_resources)
189 pdata->release_resources();
190 return ret;
191}
192
193static int lis3lv02d_i2c_remove(struct i2c_client *client)
194{
195 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
196 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
197
198 if (pdata && pdata->release_resources)
199 pdata->release_resources();
200
201 lis3lv02d_joystick_disable(lis3);
202 lis3lv02d_remove_fs(&lis3_dev);
203
204 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
205 lis3_dev.regulators);
206 return 0;
207}
208
209#ifdef CONFIG_PM_SLEEP
210static int lis3lv02d_i2c_suspend(struct device *dev)
211{
212 struct i2c_client *client = to_i2c_client(dev);
213 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
214
215 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
216 lis3lv02d_poweroff(lis3);
217 return 0;
218}
219
220static int lis3lv02d_i2c_resume(struct device *dev)
221{
222 struct i2c_client *client = to_i2c_client(dev);
223 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
224
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))
232 lis3lv02d_poweron(lis3);
233
234 return 0;
235}
236#endif /* CONFIG_PM_SLEEP */
237
238#ifdef CONFIG_PM
239static int lis3_i2c_runtime_suspend(struct device *dev)
240{
241 struct i2c_client *client = to_i2c_client(dev);
242 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
243
244 lis3lv02d_poweroff(lis3);
245 return 0;
246}
247
248static int lis3_i2c_runtime_resume(struct device *dev)
249{
250 struct i2c_client *client = to_i2c_client(dev);
251 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
252
253 lis3lv02d_poweron(lis3);
254 return 0;
255}
256#endif /* CONFIG_PM */
257
258static const struct i2c_device_id lis3lv02d_id[] = {
259 {"lis3lv02d", LIS3LV02D},
260 {"lis331dlh", LIS331DLH},
261 {}
262};
263
264MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
265
266static 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
274static struct i2c_driver lis3lv02d_i2c_driver = {
275 .driver = {
276 .name = DRV_NAME,
277 .pm = &lis3_pm_ops,
278 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
279 },
280 .probe = lis3lv02d_i2c_probe,
281 .remove = lis3lv02d_i2c_remove,
282 .id_table = lis3lv02d_id,
283};
284
285module_i2c_driver(lis3lv02d_i2c_driver);
286
287MODULE_AUTHOR("Nokia Corporation");
288MODULE_DESCRIPTION("lis3lv02d I2C interface");
289MODULE_LICENSE("GPL");