2 * drivers/hwmon/lis3lv02d_i2c.c
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> ).
8 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
10 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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.
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.
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
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>
34 #include <linux/of_platform.h>
35 #include <linux/of_device.h>
37 #include "lis3lv02d.h"
39 #define DRV_NAME "lis3lv02d_i2c"
41 static const char reg_vdd
[] = "Vdd";
42 static const char reg_vdd_io
[] = "Vdd_IO";
44 static int lis3_reg_ctrl(struct lis3lv02d
*lis3
, bool state
)
47 if (state
== LIS3_REG_OFF
) {
48 ret
= regulator_bulk_disable(ARRAY_SIZE(lis3
->regulators
),
51 ret
= regulator_bulk_enable(ARRAY_SIZE(lis3
->regulators
),
53 /* Chip needs time to wakeup. Not mentioned in datasheet */
54 usleep_range(10000, 20000);
59 static inline s32
lis3_i2c_write(struct lis3lv02d
*lis3
, int reg
, u8 value
)
61 struct i2c_client
*c
= lis3
->bus_priv
;
62 return i2c_smbus_write_byte_data(c
, reg
, value
);
65 static inline s32
lis3_i2c_read(struct lis3lv02d
*lis3
, int reg
, u8
*v
)
67 struct i2c_client
*c
= lis3
->bus_priv
;
68 *v
= i2c_smbus_read_byte_data(c
, reg
);
72 static inline s32
lis3_i2c_blockread(struct lis3lv02d
*lis3
, int reg
, int len
,
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
);
80 static int lis3_i2c_init(struct lis3lv02d
*lis3
)
85 lis3_reg_ctrl(lis3
, LIS3_REG_ON
);
87 lis3
->read(lis3
, WHO_AM_I
, ®
);
88 if (reg
!= lis3
->whoami
)
89 printk(KERN_ERR
"lis3: power on failure\n");
91 /* power up the device */
92 ret
= lis3
->read(lis3
, CTRL_REG1
, ®
);
96 if (lis3
->whoami
== WAI_3DLH
)
97 reg
|= CTRL1_PM0
| CTRL1_Xen
| CTRL1_Yen
| CTRL1_Zen
;
99 reg
|= CTRL1_PD0
| CTRL1_Xen
| CTRL1_Yen
| CTRL1_Zen
;
101 return lis3
->write(lis3
, CTRL_REG1
, reg
);
104 /* Default axis mapping but it can be overwritten by platform data */
105 static union axis_conversion lis3lv02d_axis_map
=
106 { .as_array
= { LIS3_DEV_X
, LIS3_DEV_Y
, LIS3_DEV_Z
} };
109 static const struct of_device_id lis3lv02d_i2c_dt_ids
[] = {
110 { .compatible
= "st,lis3lv02d" },
113 MODULE_DEVICE_TABLE(of
, lis3lv02d_i2c_dt_ids
);
116 static int lis3lv02d_i2c_probe(struct i2c_client
*client
,
117 const struct i2c_device_id
*id
)
120 struct lis3lv02d_platform_data
*pdata
= client
->dev
.platform_data
;
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
);
128 pdata
= lis3_dev
.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
;
139 lis3lv02d_axis_map
.x
= pdata
->axis_x
;
142 lis3lv02d_axis_map
.y
= pdata
->axis_y
;
145 lis3lv02d_axis_map
.z
= pdata
->axis_z
;
147 if (pdata
->setup_resources
)
148 ret
= pdata
->setup_resources();
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
);
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
;
171 i2c_set_clientdata(client
, &lis3_dev
);
173 /* Provide power over the init call */
174 lis3_reg_ctrl(&lis3_dev
, LIS3_REG_ON
);
176 ret
= lis3lv02d_init_device(&lis3_dev
);
178 lis3_reg_ctrl(&lis3_dev
, LIS3_REG_OFF
);
185 regulator_bulk_free(ARRAY_SIZE(lis3_dev
.regulators
),
186 lis3_dev
.regulators
);
188 if (pdata
&& pdata
->release_resources
)
189 pdata
->release_resources();
193 static int lis3lv02d_i2c_remove(struct i2c_client
*client
)
195 struct lis3lv02d
*lis3
= i2c_get_clientdata(client
);
196 struct lis3lv02d_platform_data
*pdata
= client
->dev
.platform_data
;
198 if (pdata
&& pdata
->release_resources
)
199 pdata
->release_resources();
201 lis3lv02d_joystick_disable(lis3
);
202 lis3lv02d_remove_fs(&lis3_dev
);
204 regulator_bulk_free(ARRAY_SIZE(lis3
->regulators
),
205 lis3_dev
.regulators
);
209 #ifdef CONFIG_PM_SLEEP
210 static int lis3lv02d_i2c_suspend(struct device
*dev
)
212 struct i2c_client
*client
= to_i2c_client(dev
);
213 struct lis3lv02d
*lis3
= i2c_get_clientdata(client
);
215 if (!lis3
->pdata
|| !lis3
->pdata
->wakeup_flags
)
216 lis3lv02d_poweroff(lis3
);
220 static int lis3lv02d_i2c_resume(struct device
*dev
)
222 struct i2c_client
*client
= to_i2c_client(dev
);
223 struct lis3lv02d
*lis3
= i2c_get_clientdata(client
);
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.
230 if (!lis3
->pdata
|| !lis3
->pdata
->wakeup_flags
||
231 pm_runtime_suspended(dev
))
232 lis3lv02d_poweron(lis3
);
236 #endif /* CONFIG_PM_SLEEP */
239 static int lis3_i2c_runtime_suspend(struct device
*dev
)
241 struct i2c_client
*client
= to_i2c_client(dev
);
242 struct lis3lv02d
*lis3
= i2c_get_clientdata(client
);
244 lis3lv02d_poweroff(lis3
);
248 static int lis3_i2c_runtime_resume(struct device
*dev
)
250 struct i2c_client
*client
= to_i2c_client(dev
);
251 struct lis3lv02d
*lis3
= i2c_get_clientdata(client
);
253 lis3lv02d_poweron(lis3
);
256 #endif /* CONFIG_PM */
258 static const struct i2c_device_id lis3lv02d_id
[] = {
259 {"lis3lv02d", LIS3LV02D
},
260 {"lis331dlh", LIS331DLH
},
264 MODULE_DEVICE_TABLE(i2c
, lis3lv02d_id
);
266 static 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
,
274 static struct i2c_driver lis3lv02d_i2c_driver
= {
278 .of_match_table
= of_match_ptr(lis3lv02d_i2c_dt_ids
),
280 .probe
= lis3lv02d_i2c_probe
,
281 .remove
= lis3lv02d_i2c_remove
,
282 .id_table
= lis3lv02d_id
,
285 module_i2c_driver(lis3lv02d_i2c_driver
);
287 MODULE_AUTHOR("Nokia Corporation");
288 MODULE_DESCRIPTION("lis3lv02d I2C interface");
289 MODULE_LICENSE("GPL");