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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, ®_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");
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, ®_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{
131 const struct i2c_device_id *id = i2c_client_get_device_id(client);
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 void da9052_i2c_remove(struct i2c_client *client)
172{
173 struct da9052 *da9052 = i2c_get_clientdata(client);
174
175 da9052_device_exit(da9052);
176}
177
178static struct i2c_driver da9052_i2c_driver = {
179 .probe_new = da9052_i2c_probe,
180 .remove = da9052_i2c_remove,
181 .id_table = da9052_i2c_id,
182 .driver = {
183 .name = "da9052",
184#ifdef CONFIG_OF
185 .of_match_table = dialog_dt_ids,
186#endif
187 },
188};
189
190static int __init da9052_i2c_init(void)
191{
192 int ret;
193
194 ret = i2c_add_driver(&da9052_i2c_driver);
195 if (ret != 0) {
196 pr_err("DA9052 I2C registration failed %d\n", ret);
197 return ret;
198 }
199
200 return 0;
201}
202subsys_initcall(da9052_i2c_init);
203
204static void __exit da9052_i2c_exit(void)
205{
206 i2c_del_driver(&da9052_i2c_driver);
207}
208module_exit(da9052_i2c_exit);
209
210MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
211MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
212MODULE_LICENSE("GPL");