1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * I2C access for DA9052 PMICs.
5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
7 * Author: David Dajun Chen <dchen@diasemi.com>
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>
17 #include <linux/mfd/da9052/da9052.h>
18 #include <linux/mfd/da9052/reg.h>
22 #include <linux/of_device.h>
25 /* I2C safe register check */
26 static inline bool i2c_safe_reg(unsigned char 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:
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
58 static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
62 switch (da9052->chip_id) {
67 /* A dummy read to a safe register address. */
68 if (!i2c_safe_reg(reg))
69 return regmap_read(da9052->regmap,
76 * For other chips parking of I2C register
77 * to a safe place is not required.
86 * According to errata item 24, multiwrite mode should be avoided
87 * in order to prevent register data corruption after power-down.
89 static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
93 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
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,
108 static const struct i2c_device_id da9052_i2c_id[] = {
110 {"da9053-aa", DA9053_AA},
111 {"da9053-ba", DA9053_BA},
112 {"da9053-bb", DA9053_BB},
113 {"da9053-bc", DA9053_BC},
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] },
128 static int da9052_i2c_probe(struct i2c_client *client,
129 const struct i2c_device_id *id)
131 struct da9052 *da9052;
134 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
138 da9052->dev = &client->dev;
139 da9052->chip_irq = client->irq;
140 da9052->fix_io = da9052_i2c_fix;
142 i2c_set_clientdata(client, da9052);
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",
152 ret = da9052_i2c_disable_multiwrite(da9052);
158 struct device_node *np = client->dev.of_node;
159 const struct of_device_id *deviceid;
161 deviceid = of_match_node(dialog_dt_ids, np);
168 dev_err(&client->dev, "id is null.\n");
172 return da9052_device_init(da9052, id->driver_data);
175 static int da9052_i2c_remove(struct i2c_client *client)
177 struct da9052 *da9052 = i2c_get_clientdata(client);
179 da9052_device_exit(da9052);
183 static struct i2c_driver da9052_i2c_driver = {
184 .probe = da9052_i2c_probe,
185 .remove = da9052_i2c_remove,
186 .id_table = da9052_i2c_id,
190 .of_match_table = dialog_dt_ids,
195 static int __init da9052_i2c_init(void)
199 ret = i2c_add_driver(&da9052_i2c_driver);
201 pr_err("DA9052 I2C registration failed %d\n", ret);
207 subsys_initcall(da9052_i2c_init);
209 static void __exit da9052_i2c_exit(void)
211 i2c_del_driver(&da9052_i2c_driver);
213 module_exit(da9052_i2c_exit);
215 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
216 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
217 MODULE_LICENSE("GPL");