Merge branch 'printk-rework' into for-linus
[linux-2.6-microblaze.git] / drivers / mfd / da9052-i2c.c
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 */
26 static 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  */
58 static 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  */
89 static 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, &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
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},
113         {"da9053-bc", DA9053_BC},
114         {}
115 };
116
117 #ifdef CONFIG_OF
118 static 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
128 static 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
175 static 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
183 static 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
195 static 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 }
207 subsys_initcall(da9052_i2c_init);
208
209 static void __exit da9052_i2c_exit(void)
210 {
211         i2c_del_driver(&da9052_i2c_driver);
212 }
213 module_exit(da9052_i2c_exit);
214
215 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
216 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
217 MODULE_LICENSE("GPL");