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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
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);
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
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
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
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
227
228
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
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
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");
290
