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		id = of_device_get_match_data(&client->dev);
160#endif
161
162	if (!id) {
163		ret = -ENODEV;
164		dev_err(&client->dev, "id is null.\n");
165		return ret;
166	}
167
168	return da9052_device_init(da9052, id->driver_data);
169}
170
171static int da9052_i2c_remove(struct i2c_client *client)
172{
173	struct da9052 *da9052 = i2c_get_clientdata(client);
174
175	da9052_device_exit(da9052);
176	return 0;
177}
178
179static struct i2c_driver da9052_i2c_driver = {
180	.probe = da9052_i2c_probe,
181	.remove = da9052_i2c_remove,
182	.id_table = da9052_i2c_id,
183	.driver = {
184		.name = "da9052",
185#ifdef CONFIG_OF
186		.of_match_table = dialog_dt_ids,
187#endif
188	},
189};
190
191static int __init da9052_i2c_init(void)
192{
193	int ret;
194
195	ret = i2c_add_driver(&da9052_i2c_driver);
196	if (ret != 0) {
197		pr_err("DA9052 I2C registration failed %d\n", ret);
198		return ret;
199	}
200
201	return 0;
202}
203subsys_initcall(da9052_i2c_init);
204
205static void __exit da9052_i2c_exit(void)
206{
207	i2c_del_driver(&da9052_i2c_driver);
208}
209module_exit(da9052_i2c_exit);
210
211MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
212MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
213MODULE_LICENSE("GPL");