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#include <linux/of.h>
17
18#include <linux/mfd/da9052/da9052.h>
19#include <linux/mfd/da9052/reg.h>
20
21
22/* I2C safe register check */
23static inline bool i2c_safe_reg(unsigned char reg)
24{
25	switch (reg) {
26	case DA9052_STATUS_A_REG:
27	case DA9052_STATUS_B_REG:
28	case DA9052_STATUS_C_REG:
29	case DA9052_STATUS_D_REG:
30	case DA9052_ADC_RES_L_REG:
31	case DA9052_ADC_RES_H_REG:
32	case DA9052_VDD_RES_REG:
33	case DA9052_ICHG_AV_REG:
34	case DA9052_TBAT_RES_REG:
35	case DA9052_ADCIN4_RES_REG:
36	case DA9052_ADCIN5_RES_REG:
37	case DA9052_ADCIN6_RES_REG:
38	case DA9052_TJUNC_RES_REG:
39	case DA9052_TSI_X_MSB_REG:
40	case DA9052_TSI_Y_MSB_REG:
41	case DA9052_TSI_LSB_REG:
42	case DA9052_TSI_Z_MSB_REG:
43		return true;
44	default:
45		return false;
46	}
47}
48
49/*
50 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
51 * gets lockup up or fails to respond following a system reset.
52 * This fix is to follow any read or write with a dummy read to a safe
53 * register.
54 */
55static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
56{
57	int val;
58
59	switch (da9052->chip_id) {
60	case DA9052:
61	case DA9053_AA:
62	case DA9053_BA:
63	case DA9053_BB:
64		/* A dummy read to a safe register address. */
65		if (!i2c_safe_reg(reg))
66			return regmap_read(da9052->regmap,
67					   DA9052_PARK_REGISTER,
68					   &val);
69		break;
70	case DA9053_BC:
71	default:
72		/*
73		 * For other chips parking of I2C register
74		 * to a safe place is not required.
75		 */
76		break;
77	}
78
79	return 0;
80}
81
82/*
83 * According to errata item 24, multiwrite mode should be avoided
84 * in order to prevent register data corruption after power-down.
85 */
86static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
87{
88	int reg_val, ret;
89
90	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
91	if (ret < 0)
92		return ret;
93
94	if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
95		reg_val |= DA9052_CONTROL_B_WRITEMODE;
96		ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
97				   reg_val);
98		if (ret < 0)
99			return ret;
100	}
101
102	return 0;
103}
104
105static const struct i2c_device_id da9052_i2c_id[] = {
106	{"da9052", DA9052},
107	{"da9053-aa", DA9053_AA},
108	{"da9053-ba", DA9053_BA},
109	{"da9053-bb", DA9053_BB},
110	{"da9053-bc", DA9053_BC},
111	{}
112};
113MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
114
115#ifdef CONFIG_OF
116static const struct of_device_id dialog_dt_ids[] = {
117	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
118	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
119	{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
120	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
121	{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
122	{ /* sentinel */ }
123};
124#endif
125
126static int da9052_i2c_probe(struct i2c_client *client)
127{
128	const struct i2c_device_id *id = i2c_client_get_device_id(client);
129	struct da9052 *da9052;
130	int ret;
131
132	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
133	if (!da9052)
134		return -ENOMEM;
135
136	da9052->dev = &client->dev;
137	da9052->chip_irq = client->irq;
138	da9052->fix_io = da9052_i2c_fix;
139
140	i2c_set_clientdata(client, da9052);
141
142	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
143	if (IS_ERR(da9052->regmap)) {
144		ret = PTR_ERR(da9052->regmap);
145		dev_err(&client->dev, "Failed to allocate register map: %d\n",
146			ret);
147		return ret;
148	}
149
150	ret = da9052_i2c_disable_multiwrite(da9052);
151	if (ret < 0)
152		return ret;
153
154#ifdef CONFIG_OF
155	if (!id)
156		id = of_device_get_match_data(&client->dev);
157#endif
158
159	if (!id) {
160		ret = -ENODEV;
161		dev_err(&client->dev, "id is null.\n");
162		return ret;
163	}
164
165	return da9052_device_init(da9052, id->driver_data);
166}
167
168static void da9052_i2c_remove(struct i2c_client *client)
169{
170	struct da9052 *da9052 = i2c_get_clientdata(client);
171
172	da9052_device_exit(da9052);
173}
174
175static struct i2c_driver da9052_i2c_driver = {
176	.probe = da9052_i2c_probe,
177	.remove = da9052_i2c_remove,
178	.id_table = da9052_i2c_id,
179	.driver = {
180		.name = "da9052",
181#ifdef CONFIG_OF
182		.of_match_table = dialog_dt_ids,
183#endif
184	},
185};
186
187static int __init da9052_i2c_init(void)
188{
189	int ret;
190
191	ret = i2c_add_driver(&da9052_i2c_driver);
192	if (ret != 0) {
193		pr_err("DA9052 I2C registration failed %d\n", ret);
194		return ret;
195	}
196
197	return 0;
198}
199subsys_initcall(da9052_i2c_init);
200
201static void __exit da9052_i2c_exit(void)
202{
203	i2c_del_driver(&da9052_i2c_driver);
204}
205module_exit(da9052_i2c_exit);
206
207MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
208MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
209