1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* Core driver for TPS61050/61052 boost converters, used for while LED
* driving, audio power amplification, white LED flash, and generic
* boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
* and a flash synchronization pin to synchronize flash events when used as
* flashgun.
*
* Copyright (C) 2011 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6105x.h>
int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
{
int ret;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_set);
int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
{
int ret;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
*buf = ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_get);
/*
* Masks off the bits in the mask and sets the bits in the bitvalues
* parameter in one atomic operation
*/
int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
u8 bitmask, u8 bitvalues)
{
int ret;
u8 regval;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
if (ret < 0)
goto fail;
regval = ret;
regval = (~bitmask & regval) | (bitmask & bitvalues);
ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
fail:
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_mask_and_set);
static int tps6105x_startup(struct tps6105x *tps6105x)
{
int ret;
u8 regval;
ret = tps6105x_get(tps6105x, TPS6105X_REG_0, ®val);
if (ret)
return ret;
switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
case TPS6105X_REG0_MODE_SHUTDOWN:
dev_info(&tps6105x->client->dev,
"TPS6105x found in SHUTDOWN mode\n");
break;
case TPS6105X_REG0_MODE_TORCH:
dev_info(&tps6105x->client->dev,
"TPS6105x found in TORCH mode\n");
break;
case TPS6105X_REG0_MODE_TORCH_FLASH:
dev_info(&tps6105x->client->dev,
"TPS6105x found in FLASH mode\n");
break;
case TPS6105X_REG0_MODE_VOLTAGE:
dev_info(&tps6105x->client->dev,
"TPS6105x found in VOLTAGE mode\n");
break;
default:
break;
}
return ret;
}
/*
* MFD cells - we have one cell which is selected operation
* mode, and we always have a GPIO cell.
*/
static struct mfd_cell tps6105x_cells[] = {
{
/* name will be runtime assigned */
.id = -1,
},
{
.name = "tps6105x-gpio",
.id = -1,
},
};
static int tps6105x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps6105x *tps6105x;
struct tps6105x_platform_data *pdata;
int ret;
int i;
tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
if (!tps6105x)
return -ENOMEM;
i2c_set_clientdata(client, tps6105x);
tps6105x->client = client;
pdata = dev_get_platdata(&client->dev);
tps6105x->pdata = pdata;
mutex_init(&tps6105x->lock);
ret = tps6105x_startup(tps6105x);
if (ret) {
dev_err(&client->dev, "chip initialization failed\n");
return ret;
}
/* Remove warning texts when you implement new cell drivers */
switch (pdata->mode) {
case TPS6105X_MODE_SHUTDOWN:
dev_info(&client->dev,
"present, not used for anything, only GPIO\n");
break;
case TPS6105X_MODE_TORCH:
tps6105x_cells[0].name = "tps6105x-leds";
dev_warn(&client->dev,
"torch mode is unsupported\n");
break;
case TPS6105X_MODE_TORCH_FLASH:
tps6105x_cells[0].name = "tps6105x-flash";
dev_warn(&client->dev,
"flash mode is unsupported\n");
break;
case TPS6105X_MODE_VOLTAGE:
tps6105x_cells[0].name ="tps6105x-regulator";
break;
default:
break;
}
/* Set up and register the platform devices. */
for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
/* One state holder for all drivers, this is simple */
tps6105x_cells[i].platform_data = tps6105x;
tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
}
return mfd_add_devices(&client->dev, 0, tps6105x_cells,
ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
}
static int tps6105x_remove(struct i2c_client *client)
{
struct tps6105x *tps6105x = i2c_get_clientdata(client);
mfd_remove_devices(&client->dev);
/* Put chip in shutdown mode */
tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
TPS6105X_REG0_MODE_MASK,
TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
return 0;
}
static const struct i2c_device_id tps6105x_id[] = {
{ "tps61050", 0 },
{ "tps61052", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tps6105x_id);
static struct i2c_driver tps6105x_driver = {
.driver = {
.name = "tps6105x",
},
.probe = tps6105x_probe,
.remove = tps6105x_remove,
.id_table = tps6105x_id,
};
static int __init tps6105x_init(void)
{
return i2c_add_driver(&tps6105x_driver);
}
subsys_initcall(tps6105x_init);
static void __exit tps6105x_exit(void)
{
i2c_del_driver(&tps6105x_driver);
}
module_exit(tps6105x_exit);
MODULE_AUTHOR("Linus Walleij");
MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
MODULE_LICENSE("GPL v2");
|
