x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / mfd / da9052-i2c.c
blob6a9fec40d018308a39e1ea24b086bfc94dfb77f0
1 /*
2 * I2C access for DA9052 PMICs.
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
6 * Author: David Dajun Chen <dchen@diasemi.com>
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.
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>
22 #include <linux/mfd/da9052/da9052.h>
23 #include <linux/mfd/da9052/reg.h>
25 #ifdef CONFIG_OF
26 #include <linux/of.h>
27 #include <linux/of_device.h>
28 #endif
30 /* I2C safe register check */
31 static inline bool i2c_safe_reg(unsigned char reg)
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;
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.
63 static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
65 int val;
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 default:
80 * For other chips parking of I2C register
81 * to a safe place is not required.
83 break;
86 return 0;
89 static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
91 int reg_val, ret;
93 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
94 if (ret < 0)
95 return ret;
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;
105 return 0;
108 static 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},
116 #ifdef CONFIG_OF
117 static const struct of_device_id dialog_dt_ids[] = {
118 { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
119 { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
120 { .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] },
121 { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
122 { /* sentinel */ }
124 #endif
126 static int da9052_i2c_probe(struct i2c_client *client,
127 const struct i2c_device_id *id)
129 struct da9052 *da9052;
130 int ret;
132 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
133 if (!da9052)
134 return -ENOMEM;
136 if (!i2c_check_functionality(client->adapter,
137 I2C_FUNC_SMBUS_BYTE_DATA)) {
138 dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
139 __func__);
140 return -ENODEV;
143 da9052->dev = &client->dev;
144 da9052->chip_irq = client->irq;
145 da9052->fix_io = da9052_i2c_fix;
147 i2c_set_clientdata(client, da9052);
149 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
150 if (IS_ERR(da9052->regmap)) {
151 ret = PTR_ERR(da9052->regmap);
152 dev_err(&client->dev, "Failed to allocate register map: %d\n",
153 ret);
154 return ret;
157 ret = da9052_i2c_enable_multiwrite(da9052);
158 if (ret < 0)
159 return ret;
161 #ifdef CONFIG_OF
162 if (!id) {
163 struct device_node *np = client->dev.of_node;
164 const struct of_device_id *deviceid;
166 deviceid = of_match_node(dialog_dt_ids, np);
167 id = deviceid->data;
169 #endif
171 if (!id) {
172 ret = -ENODEV;
173 dev_err(&client->dev, "id is null.\n");
174 return ret;
177 ret = da9052_device_init(da9052, id->driver_data);
178 if (ret != 0)
179 return ret;
181 return 0;
184 static int da9052_i2c_remove(struct i2c_client *client)
186 struct da9052 *da9052 = i2c_get_clientdata(client);
188 da9052_device_exit(da9052);
189 return 0;
192 static struct i2c_driver da9052_i2c_driver = {
193 .probe = da9052_i2c_probe,
194 .remove = da9052_i2c_remove,
195 .id_table = da9052_i2c_id,
196 .driver = {
197 .name = "da9052",
198 .owner = THIS_MODULE,
199 #ifdef CONFIG_OF
200 .of_match_table = dialog_dt_ids,
201 #endif
205 static int __init da9052_i2c_init(void)
207 int ret;
209 ret = i2c_add_driver(&da9052_i2c_driver);
210 if (ret != 0) {
211 pr_err("DA9052 I2C registration failed %d\n", ret);
212 return ret;
215 return 0;
217 subsys_initcall(da9052_i2c_init);
219 static void __exit da9052_i2c_exit(void)
221 i2c_del_driver(&da9052_i2c_driver);
223 module_exit(da9052_i2c_exit);
225 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
226 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
227 MODULE_LICENSE("GPL");