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84c99db8 AJ |
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 | ||
58d114b6 YCLP |
25 | #ifdef CONFIG_OF |
26 | #include <linux/of.h> | |
27 | #include <linux/of_device.h> | |
28 | #endif | |
29 | ||
0a8c290a AJ |
30 | /* I2C safe register check */ |
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 | */ | |
c3e9e6b6 | 63 | static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg) |
0a8c290a AJ |
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. */ | |
5b7b2ac1 | 73 | if (!i2c_safe_reg(reg)) |
0a8c290a AJ |
74 | return regmap_read(da9052->regmap, |
75 | DA9052_PARK_REGISTER, | |
76 | &val); | |
77 | break; | |
6c049b2a | 78 | case DA9053_BC: |
0a8c290a AJ |
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 | } | |
0a8c290a | 89 | |
43e30f23 DJ |
90 | /* |
91 | * According to errata item 24, multiwrite mode should be avoided | |
92 | * in order to prevent register data corruption after power-down. | |
93 | */ | |
94 | static int da9052_i2c_disable_multiwrite(struct da9052 *da9052) | |
84c99db8 AJ |
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 | ||
43e30f23 DJ |
102 | if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) { |
103 | reg_val |= DA9052_CONTROL_B_WRITEMODE; | |
84c99db8 AJ |
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 | ||
e27d650b | 113 | static const struct i2c_device_id da9052_i2c_id[] = { |
58d114b6 YCLP |
114 | {"da9052", DA9052}, |
115 | {"da9053-aa", DA9053_AA}, | |
116 | {"da9053-ba", DA9053_BA}, | |
117 | {"da9053-bb", DA9053_BB}, | |
6c049b2a | 118 | {"da9053-bc", DA9053_BC}, |
58d114b6 YCLP |
119 | {} |
120 | }; | |
121 | ||
122 | #ifdef CONFIG_OF | |
123 | static const struct of_device_id dialog_dt_ids[] = { | |
124 | { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] }, | |
125 | { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] }, | |
6c049b2a | 126 | { .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] }, |
58d114b6 | 127 | { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] }, |
6c049b2a | 128 | { .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] }, |
58d114b6 YCLP |
129 | { /* sentinel */ } |
130 | }; | |
131 | #endif | |
132 | ||
f791be49 | 133 | static int da9052_i2c_probe(struct i2c_client *client, |
84c99db8 AJ |
134 | const struct i2c_device_id *id) |
135 | { | |
136 | struct da9052 *da9052; | |
137 | int ret; | |
138 | ||
6608a5e2 | 139 | da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL); |
84c99db8 AJ |
140 | if (!da9052) |
141 | return -ENOMEM; | |
142 | ||
84c99db8 AJ |
143 | da9052->dev = &client->dev; |
144 | da9052->chip_irq = client->irq; | |
0a8c290a | 145 | da9052->fix_io = da9052_i2c_fix; |
84c99db8 AJ |
146 | |
147 | i2c_set_clientdata(client, da9052); | |
148 | ||
6608a5e2 | 149 | da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config); |
84c99db8 AJ |
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); | |
6608a5e2 | 154 | return ret; |
84c99db8 AJ |
155 | } |
156 | ||
43e30f23 | 157 | ret = da9052_i2c_disable_multiwrite(da9052); |
84c99db8 | 158 | if (ret < 0) |
6608a5e2 | 159 | return ret; |
84c99db8 | 160 | |
58d114b6 YCLP |
161 | #ifdef CONFIG_OF |
162 | if (!id) { | |
163 | struct device_node *np = client->dev.of_node; | |
164 | const struct of_device_id *deviceid; | |
165 | ||
9e69ab41 | 166 | deviceid = of_match_node(dialog_dt_ids, np); |
e27d650b | 167 | id = deviceid->data; |
58d114b6 YCLP |
168 | } |
169 | #endif | |
170 | ||
171 | if (!id) { | |
172 | ret = -ENODEV; | |
173 | dev_err(&client->dev, "id is null.\n"); | |
6608a5e2 | 174 | return ret; |
58d114b6 YCLP |
175 | } |
176 | ||
ad698ea4 | 177 | return da9052_device_init(da9052, id->driver_data); |
84c99db8 AJ |
178 | } |
179 | ||
4740f73f | 180 | static int da9052_i2c_remove(struct i2c_client *client) |
84c99db8 AJ |
181 | { |
182 | struct da9052 *da9052 = i2c_get_clientdata(client); | |
183 | ||
184 | da9052_device_exit(da9052); | |
84c99db8 AJ |
185 | return 0; |
186 | } | |
187 | ||
84c99db8 AJ |
188 | static struct i2c_driver da9052_i2c_driver = { |
189 | .probe = da9052_i2c_probe, | |
84449216 | 190 | .remove = da9052_i2c_remove, |
84c99db8 AJ |
191 | .id_table = da9052_i2c_id, |
192 | .driver = { | |
193 | .name = "da9052", | |
58d114b6 YCLP |
194 | #ifdef CONFIG_OF |
195 | .of_match_table = dialog_dt_ids, | |
196 | #endif | |
84c99db8 AJ |
197 | }, |
198 | }; | |
199 | ||
200 | static int __init da9052_i2c_init(void) | |
201 | { | |
202 | int ret; | |
203 | ||
204 | ret = i2c_add_driver(&da9052_i2c_driver); | |
205 | if (ret != 0) { | |
206 | pr_err("DA9052 I2C registration failed %d\n", ret); | |
207 | return ret; | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | subsys_initcall(da9052_i2c_init); | |
213 | ||
214 | static void __exit da9052_i2c_exit(void) | |
215 | { | |
216 | i2c_del_driver(&da9052_i2c_driver); | |
217 | } | |
218 | module_exit(da9052_i2c_exit); | |
219 | ||
220 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
221 | MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); | |
222 | MODULE_LICENSE("GPL"); |