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
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* TI LMU (Lighting Management Unit) Core Driver
*
* Copyright 2017 Texas Instruments
*
* Author: Milo Kim <milo.kim@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ti-lmu.h>
#include <linux/mfd/ti-lmu-register.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/slab.h>
struct ti_lmu_data {
const struct mfd_cell *cells;
int num_cells;
unsigned int max_register;
};
static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
{
if (lmu->en_gpio)
gpiod_set_value(lmu->en_gpio, 1);
/* Delay about 1ms after HW enable pin control */
usleep_range(1000, 1500);
/* LM3631 has additional power up sequence - enable LCD_EN bit. */
if (id == LM3631) {
return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
LM3631_LCD_EN_MASK,
LM3631_LCD_EN_MASK);
}
return 0;
}
static void ti_lmu_disable_hw(void *data)
{
struct ti_lmu *lmu = data;
if (lmu->en_gpio)
gpiod_set_value(lmu->en_gpio, 0);
}
static const struct mfd_cell lm3532_devices[] = {
{
.name = "ti-lmu-backlight",
.id = LM3532,
.of_compatible = "ti,lm3532-backlight",
},
};
#define LM363X_REGULATOR(_id) \
{ \
.name = "lm363x-regulator", \
.id = _id, \
.of_compatible = "ti,lm363x-regulator", \
} \
static const struct mfd_cell lm3631_devices[] = {
LM363X_REGULATOR(LM3631_BOOST),
LM363X_REGULATOR(LM3631_LDO_CONT),
LM363X_REGULATOR(LM3631_LDO_OREF),
LM363X_REGULATOR(LM3631_LDO_POS),
LM363X_REGULATOR(LM3631_LDO_NEG),
{
.name = "ti-lmu-backlight",
.id = LM3631,
.of_compatible = "ti,lm3631-backlight",
},
};
static const struct mfd_cell lm3632_devices[] = {
LM363X_REGULATOR(LM3632_BOOST),
LM363X_REGULATOR(LM3632_LDO_POS),
LM363X_REGULATOR(LM3632_LDO_NEG),
{
.name = "ti-lmu-backlight",
.id = LM3632,
.of_compatible = "ti,lm3632-backlight",
},
};
static const struct mfd_cell lm3633_devices[] = {
{
.name = "ti-lmu-backlight",
.id = LM3633,
.of_compatible = "ti,lm3633-backlight",
},
{
.name = "lm3633-leds",
.of_compatible = "ti,lm3633-leds",
},
/* Monitoring driver for open/short circuit detection */
{
.name = "ti-lmu-fault-monitor",
.id = LM3633,
.of_compatible = "ti,lm3633-fault-monitor",
},
};
static const struct mfd_cell lm3695_devices[] = {
{
.name = "ti-lmu-backlight",
.id = LM3695,
.of_compatible = "ti,lm3695-backlight",
},
};
static const struct mfd_cell lm3697_devices[] = {
{
.name = "ti-lmu-backlight",
.id = LM3697,
.of_compatible = "ti,lm3697-backlight",
},
/* Monitoring driver for open/short circuit detection */
{
.name = "ti-lmu-fault-monitor",
.id = LM3697,
.of_compatible = "ti,lm3697-fault-monitor",
},
};
#define TI_LMU_DATA(chip, max_reg) \
static const struct ti_lmu_data chip##_data = \
{ \
.cells = chip##_devices, \
.num_cells = ARRAY_SIZE(chip##_devices),\
.max_register = max_reg, \
} \
TI_LMU_DATA(lm3532, LM3532_MAX_REG);
TI_LMU_DATA(lm3631, LM3631_MAX_REG);
TI_LMU_DATA(lm3632, LM3632_MAX_REG);
TI_LMU_DATA(lm3633, LM3633_MAX_REG);
TI_LMU_DATA(lm3695, LM3695_MAX_REG);
TI_LMU_DATA(lm3697, LM3697_MAX_REG);
static const struct of_device_id ti_lmu_of_match[] = {
{ .compatible = "ti,lm3532", .data = &lm3532_data },
{ .compatible = "ti,lm3631", .data = &lm3631_data },
{ .compatible = "ti,lm3632", .data = &lm3632_data },
{ .compatible = "ti,lm3633", .data = &lm3633_data },
{ .compatible = "ti,lm3695", .data = &lm3695_data },
{ .compatible = "ti,lm3697", .data = &lm3697_data },
{ }
};
MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
struct device *dev = &cl->dev;
const struct of_device_id *match;
const struct ti_lmu_data *data;
struct regmap_config regmap_cfg;
struct ti_lmu *lmu;
int ret;
match = of_match_device(ti_lmu_of_match, dev);
if (!match)
return -ENODEV;
/*
* Get device specific data from of_match table.
* This data is defined by using TI_LMU_DATA() macro.
*/
data = (struct ti_lmu_data *)match->data;
lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
if (!lmu)
return -ENOMEM;
lmu->dev = &cl->dev;
/* Setup regmap */
memset(®map_cfg, 0, sizeof(struct regmap_config));
regmap_cfg.reg_bits = 8;
regmap_cfg.val_bits = 8;
regmap_cfg.name = id->name;
regmap_cfg.max_register = data->max_register;
lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
if (IS_ERR(lmu->regmap))
return PTR_ERR(lmu->regmap);
/* HW enable pin control and additional power up sequence if required */
lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(lmu->en_gpio)) {
ret = PTR_ERR(lmu->en_gpio);
dev_err(dev, "Can not request enable GPIO: %d\n", ret);
return ret;
}
ret = ti_lmu_enable_hw(lmu, id->driver_data);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
if (ret)
return ret;
/*
* Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
* After fault detection is done, some devices should re-initialize
* configuration. The notifier enables such kind of handling.
*/
BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
i2c_set_clientdata(cl, lmu);
return devm_mfd_add_devices(lmu->dev, 0, data->cells,
data->num_cells, NULL, 0, NULL);
}
static const struct i2c_device_id ti_lmu_ids[] = {
{ "lm3532", LM3532 },
{ "lm3631", LM3631 },
{ "lm3632", LM3632 },
{ "lm3633", LM3633 },
{ "lm3695", LM3695 },
{ "lm3697", LM3697 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
static struct i2c_driver ti_lmu_driver = {
.probe = ti_lmu_probe,
.driver = {
.name = "ti-lmu",
.of_match_table = ti_lmu_of_match,
},
.id_table = ti_lmu_ids,
};
module_i2c_driver(ti_lmu_driver);
MODULE_DESCRIPTION("TI LMU MFD Core Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL v2");
|
