1 /*
2 * I2C access for DA9052 PMICs.
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14
15 #include <linux/device.h>
16 #include <linux/module.h>
17 #include <linux/input.h>
18 #include <linux/mfd/core.h>
19 #include <linux/i2c.h>
20 #include <linux/err.h>
21
22 #include <linux/mfd/da9052/da9052.h>
23 #include <linux/mfd/da9052/reg.h>
24
25 #ifdef CONFIG_OF
26 #include <linux/of.h>
27 #include <linux/of_device.h>
28 #endif
29
30 /* I2C safe register check */
i2c_safe_reg(unsigned char reg)31 static inline bool i2c_safe_reg(unsigned char reg)
32 {
33 switch (reg) {
34 case DA9052_STATUS_A_REG:
35 case DA9052_STATUS_B_REG:
36 case DA9052_STATUS_C_REG:
37 case DA9052_STATUS_D_REG:
38 case DA9052_ADC_RES_L_REG:
39 case DA9052_ADC_RES_H_REG:
40 case DA9052_VDD_RES_REG:
41 case DA9052_ICHG_AV_REG:
42 case DA9052_TBAT_RES_REG:
43 case DA9052_ADCIN4_RES_REG:
44 case DA9052_ADCIN5_RES_REG:
45 case DA9052_ADCIN6_RES_REG:
46 case DA9052_TJUNC_RES_REG:
47 case DA9052_TSI_X_MSB_REG:
48 case DA9052_TSI_Y_MSB_REG:
49 case DA9052_TSI_LSB_REG:
50 case DA9052_TSI_Z_MSB_REG:
51 return true;
52 default:
53 return false;
54 }
55 }
56
57 /*
58 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
59 * gets lockup up or fails to respond following a system reset.
60 * This fix is to follow any read or write with a dummy read to a safe
61 * register.
62 */
da9052_i2c_fix(struct da9052 * da9052,unsigned char reg)63 static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
64 {
65 int val;
66
67 switch (da9052->chip_id) {
68 case DA9052:
69 case DA9053_AA:
70 case DA9053_BA:
71 case DA9053_BB:
72 /* A dummy read to a safe register address. */
73 if (!i2c_safe_reg(reg))
74 return regmap_read(da9052->regmap,
75 DA9052_PARK_REGISTER,
76 &val);
77 break;
78 case DA9053_BC:
79 default:
80 /*
81 * For other chips parking of I2C register
82 * to a safe place is not required.
83 */
84 break;
85 }
86
87 return 0;
88 }
89
90 /*
91 * According to errata item 24, multiwrite mode should be avoided
92 * in order to prevent register data corruption after power-down.
93 */
da9052_i2c_disable_multiwrite(struct da9052 * da9052)94 static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
95 {
96 int reg_val, ret;
97
98 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
99 if (ret < 0)
100 return ret;
101
102 if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
103 reg_val |= DA9052_CONTROL_B_WRITEMODE;
104 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
105 reg_val);
106 if (ret < 0)
107 return ret;
108 }
109
110 return 0;
111 }
112
113 static const struct i2c_device_id da9052_i2c_id[] = {
114 {"da9052", DA9052},
115 {"da9053-aa", DA9053_AA},
116 {"da9053-ba", DA9053_BA},
117 {"da9053-bb", DA9053_BB},
118 {"da9053-bc", DA9053_BC},
119 {}
120 };
121 MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
122
123 #ifdef CONFIG_OF
124 static const struct of_device_id dialog_dt_ids[] = {
125 { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
126 { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
127 { .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
128 { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
129 { .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
130 { /* sentinel */ }
131 };
132 #endif
133
da9052_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)134 static int da9052_i2c_probe(struct i2c_client *client,
135 const struct i2c_device_id *id)
136 {
137 struct da9052 *da9052;
138 int ret;
139
140 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
141 if (!da9052)
142 return -ENOMEM;
143
144 da9052->dev = &client->dev;
145 da9052->chip_irq = client->irq;
146 da9052->fix_io = da9052_i2c_fix;
147
148 i2c_set_clientdata(client, da9052);
149
150 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
151 if (IS_ERR(da9052->regmap)) {
152 ret = PTR_ERR(da9052->regmap);
153 dev_err(&client->dev, "Failed to allocate register map: %d\n",
154 ret);
155 return ret;
156 }
157
158 ret = da9052_i2c_disable_multiwrite(da9052);
159 if (ret < 0)
160 return ret;
161
162 #ifdef CONFIG_OF
163 if (!id) {
164 struct device_node *np = client->dev.of_node;
165 const struct of_device_id *deviceid;
166
167 deviceid = of_match_node(dialog_dt_ids, np);
168 id = deviceid->data;
169 }
170 #endif
171
172 if (!id) {
173 ret = -ENODEV;
174 dev_err(&client->dev, "id is null.\n");
175 return ret;
176 }
177
178 return da9052_device_init(da9052, id->driver_data);
179 }
180
da9052_i2c_remove(struct i2c_client * client)181 static int da9052_i2c_remove(struct i2c_client *client)
182 {
183 struct da9052 *da9052 = i2c_get_clientdata(client);
184
185 da9052_device_exit(da9052);
186 return 0;
187 }
188
189 static struct i2c_driver da9052_i2c_driver = {
190 .probe = da9052_i2c_probe,
191 .remove = da9052_i2c_remove,
192 .id_table = da9052_i2c_id,
193 .driver = {
194 .name = "da9052",
195 #ifdef CONFIG_OF
196 .of_match_table = dialog_dt_ids,
197 #endif
198 },
199 };
200
da9052_i2c_init(void)201 static int __init da9052_i2c_init(void)
202 {
203 int ret;
204
205 ret = i2c_add_driver(&da9052_i2c_driver);
206 if (ret != 0) {
207 pr_err("DA9052 I2C registration failed %d\n", ret);
208 return ret;
209 }
210
211 return 0;
212 }
213 subsys_initcall(da9052_i2c_init);
214
da9052_i2c_exit(void)215 static void __exit da9052_i2c_exit(void)
216 {
217 i2c_del_driver(&da9052_i2c_driver);
218 }
219 module_exit(da9052_i2c_exit);
220
221 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
222 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
223 MODULE_LICENSE("GPL");
224