tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * I2C access for DA9052 PMICs.
4 *
5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9
10#include <linux/device.h>
11#include <linux/module.h>
12#include <linux/input.h>
13#include <linux/mfd/core.h>
14#include <linux/i2c.h>
15#include <linux/err.h>
16
17#include <linux/mfd/da9052/da9052.h>
18#include <linux/mfd/da9052/reg.h>
19
20#ifdef CONFIG_OF
21#include <linux/of.h>
22#include <linux/of_device.h>
23#endif
24
25/* I2C safe register check */
26static inline bool i2c_safe_reg(unsigned char reg)
27{
28 switch (reg) {
29 case DA9052_STATUS_A_REG:
30 case DA9052_STATUS_B_REG:
31 case DA9052_STATUS_C_REG:
32 case DA9052_STATUS_D_REG:
33 case DA9052_ADC_RES_L_REG:
34 case DA9052_ADC_RES_H_REG:
35 case DA9052_VDD_RES_REG:
36 case DA9052_ICHG_AV_REG:
37 case DA9052_TBAT_RES_REG:
38 case DA9052_ADCIN4_RES_REG:
39 case DA9052_ADCIN5_RES_REG:
40 case DA9052_ADCIN6_RES_REG:
41 case DA9052_TJUNC_RES_REG:
42 case DA9052_TSI_X_MSB_REG:
43 case DA9052_TSI_Y_MSB_REG:
44 case DA9052_TSI_LSB_REG:
45 case DA9052_TSI_Z_MSB_REG:
46 return true;
47 default:
48 return false;
49 }
50}
51
52/*
53 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
54 * gets lockup up or fails to respond following a system reset.
55 * This fix is to follow any read or write with a dummy read to a safe
56 * register.
57 */
58static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
59{
60 int val;
61
62 switch (da9052->chip_id) {
63 case DA9052:
64 case DA9053_AA:
65 case DA9053_BA:
66 case DA9053_BB:
67 /* A dummy read to a safe register address. */
68 if (!i2c_safe_reg(reg))
69 return regmap_read(da9052->regmap,
70 DA9052_PARK_REGISTER,
71 &val);
72 break;
73 case DA9053_BC:
74 default:
75 /*
76 * For other chips parking of I2C register
77 * to a safe place is not required.
78 */
79 break;
80 }
81
82 return 0;
83}
84
85/*
86 * According to errata item 24, multiwrite mode should be avoided
87 * in order to prevent register data corruption after power-down.
88 */
89static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
90{
91 int reg_val, ret;
92
93 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
94 if (ret < 0)
95 return ret;
96
97 if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
98 reg_val |= DA9052_CONTROL_B_WRITEMODE;
99 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
100 reg_val);
101 if (ret < 0)
102 return ret;
103 }
104
105 return 0;
106}
107
108static const struct i2c_device_id da9052_i2c_id[] = {
109 {"da9052", DA9052},
110 {"da9053-aa", DA9053_AA},
111 {"da9053-ba", DA9053_BA},
112 {"da9053-bb", DA9053_BB},
113 {"da9053-bc", DA9053_BC},
114 {}
115};
116
117#ifdef CONFIG_OF
118static const struct of_device_id dialog_dt_ids[] = {
119 { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
120 { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
121 { .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
122 { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
123 { .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
124 { /* sentinel */ }
125};
126#endif
127
128static int da9052_i2c_probe(struct i2c_client *client,
129 const struct i2c_device_id *id)
130{
131 struct da9052 *da9052;
132 int ret;
133
134 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
135 if (!da9052)
136 return -ENOMEM;
137
138 da9052->dev = &client->dev;
139 da9052->chip_irq = client->irq;
140 da9052->fix_io = da9052_i2c_fix;
141
142 i2c_set_clientdata(client, da9052);
143
144 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
145 if (IS_ERR(da9052->regmap)) {
146 ret = PTR_ERR(da9052->regmap);
147 dev_err(&client->dev, "Failed to allocate register map: %d\n",
148 ret);
149 return ret;
150 }
151
152 ret = da9052_i2c_disable_multiwrite(da9052);
153 if (ret < 0)
154 return ret;
155
156#ifdef CONFIG_OF
157 if (!id) {
158 struct device_node *np = client->dev.of_node;
159 const struct of_device_id *deviceid;
160
161 deviceid = of_match_node(dialog_dt_ids, np);
162 id = deviceid->data;
163 }
164#endif
165
166 if (!id) {
167 ret = -ENODEV;
168 dev_err(&client->dev, "id is null.\n");
169 return ret;
170 }
171
172 return da9052_device_init(da9052, id->driver_data);
173}
174
175static int da9052_i2c_remove(struct i2c_client *client)
176{
177 struct da9052 *da9052 = i2c_get_clientdata(client);
178
179 da9052_device_exit(da9052);
180 return 0;
181}
182
183static struct i2c_driver da9052_i2c_driver = {
184 .probe = da9052_i2c_probe,
185 .remove = da9052_i2c_remove,
186 .id_table = da9052_i2c_id,
187 .driver = {
188 .name = "da9052",
189#ifdef CONFIG_OF
190 .of_match_table = dialog_dt_ids,
191#endif
192 },
193};
194
195static int __init da9052_i2c_init(void)
196{
197 int ret;
198
199 ret = i2c_add_driver(&da9052_i2c_driver);
200 if (ret != 0) {
201 pr_err("DA9052 I2C registration failed %d\n", ret);
202 return ret;
203 }
204
205 return 0;
206}
207subsys_initcall(da9052_i2c_init);
208
209static void __exit da9052_i2c_exit(void)
210{
211 i2c_del_driver(&da9052_i2c_driver);
212}
213module_exit(da9052_i2c_exit);
214
215MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
216MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
217MODULE_LICENSE("GPL");