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 */
26static 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 */
58static 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 */
89static 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
108static 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};
116MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
117
118#ifdef CONFIG_OF
119static const struct of_device_id dialog_dt_ids[] = {
120	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
121	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
122	{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
123	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
124	{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
125	{ /* sentinel */ }
126};
127#endif
128
129static int da9052_i2c_probe(struct i2c_client *client,
130				       const struct i2c_device_id *id)
131{
132	struct da9052 *da9052;
133	int ret;
134
135	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
136	if (!da9052)
137		return -ENOMEM;
138
139	da9052->dev = &client->dev;
140	da9052->chip_irq = client->irq;
141	da9052->fix_io = da9052_i2c_fix;
142
143	i2c_set_clientdata(client, da9052);
144
145	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
146	if (IS_ERR(da9052->regmap)) {
147		ret = PTR_ERR(da9052->regmap);
148		dev_err(&client->dev, "Failed to allocate register map: %d\n",
149			ret);
150		return ret;
151	}
152
153	ret = da9052_i2c_disable_multiwrite(da9052);
154	if (ret < 0)
155		return ret;
156
157#ifdef CONFIG_OF
158	if (!id) {
159		struct device_node *np = client->dev.of_node;
160		const struct of_device_id *deviceid;
161
162		deviceid = of_match_node(dialog_dt_ids, np);
163		id = deviceid->data;
164	}
165#endif
166
167	if (!id) {
168		ret = -ENODEV;
169		dev_err(&client->dev, "id is null.\n");
170		return ret;
171	}
172
173	return da9052_device_init(da9052, id->driver_data);
174}
175
176static int da9052_i2c_remove(struct i2c_client *client)
177{
178	struct da9052 *da9052 = i2c_get_clientdata(client);
179
180	da9052_device_exit(da9052);
181	return 0;
182}
183
184static struct i2c_driver da9052_i2c_driver = {
185	.probe = da9052_i2c_probe,
186	.remove = da9052_i2c_remove,
187	.id_table = da9052_i2c_id,
188	.driver = {
189		.name = "da9052",
190#ifdef CONFIG_OF
191		.of_match_table = dialog_dt_ids,
192#endif
193	},
194};
195
196static int __init da9052_i2c_init(void)
197{
198	int ret;
199
200	ret = i2c_add_driver(&da9052_i2c_driver);
201	if (ret != 0) {
202		pr_err("DA9052 I2C registration failed %d\n", ret);
203		return ret;
204	}
205
206	return 0;
207}
208subsys_initcall(da9052_i2c_init);
209
210static void __exit da9052_i2c_exit(void)
211{
212	i2c_del_driver(&da9052_i2c_driver);
213}
214module_exit(da9052_i2c_exit);
215
216MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
217MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
218MODULE_LICENSE("GPL");
219