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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* I2C access for DA9052 PMICs.
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/mfd/core.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_device.h>
#endif
/* I2C safe register check */
static inline bool i2c_safe_reg(unsigned char reg)
{
switch (reg) {
case DA9052_STATUS_A_REG:
case DA9052_STATUS_B_REG:
case DA9052_STATUS_C_REG:
case DA9052_STATUS_D_REG:
case DA9052_ADC_RES_L_REG:
case DA9052_ADC_RES_H_REG:
case DA9052_VDD_RES_REG:
case DA9052_ICHG_AV_REG:
case DA9052_TBAT_RES_REG:
case DA9052_ADCIN4_RES_REG:
case DA9052_ADCIN5_RES_REG:
case DA9052_ADCIN6_RES_REG:
case DA9052_TJUNC_RES_REG:
case DA9052_TSI_X_MSB_REG:
case DA9052_TSI_Y_MSB_REG:
case DA9052_TSI_LSB_REG:
case DA9052_TSI_Z_MSB_REG:
return true;
default:
return false;
}
}
/*
* There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
* gets lockup up or fails to respond following a system reset.
* This fix is to follow any read or write with a dummy read to a safe
* register.
*/
static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
{
int val;
switch (da9052->chip_id) {
case DA9052:
case DA9053_AA:
case DA9053_BA:
case DA9053_BB:
/* A dummy read to a safe register address. */
if (!i2c_safe_reg(reg))
return regmap_read(da9052->regmap,
DA9052_PARK_REGISTER,
&val);
break;
case DA9053_BC:
default:
/*
* For other chips parking of I2C register
* to a safe place is not required.
*/
break;
}
return 0;
}
/*
* According to errata item 24, multiwrite mode should be avoided
* in order to prevent register data corruption after power-down.
*/
static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
{
int reg_val, ret;
ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
if (ret < 0)
return ret;
if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
reg_val |= DA9052_CONTROL_B_WRITEMODE;
ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
reg_val);
if (ret < 0)
return ret;
}
return 0;
}
static const struct i2c_device_id da9052_i2c_id[] = {
{"da9052", DA9052},
{"da9053-aa", DA9053_AA},
{"da9053-ba", DA9053_BA},
{"da9053-bb", DA9053_BB},
{"da9053-bc", DA9053_BC},
{}
};
MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
#ifdef CONFIG_OF
static const struct of_device_id dialog_dt_ids[] = {
{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
{ /* sentinel */ }
};
#endif
static int da9052_i2c_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct da9052 *da9052;
int ret;
da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
if (!da9052)
return -ENOMEM;
da9052->dev = &client->dev;
da9052->chip_irq = client->irq;
da9052->fix_io = da9052_i2c_fix;
i2c_set_clientdata(client, da9052);
da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
if (IS_ERR(da9052->regmap)) {
ret = PTR_ERR(da9052->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = da9052_i2c_disable_multiwrite(da9052);
if (ret < 0)
return ret;
#ifdef CONFIG_OF
if (!id)
id = of_device_get_match_data(&client->dev);
#endif
if (!id) {
ret = -ENODEV;
dev_err(&client->dev, "id is null.\n");
return ret;
}
return da9052_device_init(da9052, id->driver_data);
}
static void da9052_i2c_remove(struct i2c_client *client)
{
struct da9052 *da9052 = i2c_get_clientdata(client);
da9052_device_exit(da9052);
}
static struct i2c_driver da9052_i2c_driver = {
.probe_new = da9052_i2c_probe,
.remove = da9052_i2c_remove,
.id_table = da9052_i2c_id,
.driver = {
.name = "da9052",
#ifdef CONFIG_OF
.of_match_table = dialog_dt_ids,
#endif
},
};
static int __init da9052_i2c_init(void)
{
int ret;
ret = i2c_add_driver(&da9052_i2c_driver);
if (ret != 0) {
pr_err("DA9052 I2C registration failed %d\n", ret);
return ret;
}
return 0;
}
subsys_initcall(da9052_i2c_init);
static void __exit da9052_i2c_exit(void)
{
i2c_del_driver(&da9052_i2c_driver);
}
module_exit(da9052_i2c_exit);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
|
