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 */ 26 static 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 */ 58 static 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 */ 89 static 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 } 107 108 static 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 }; 116 MODULE_DEVICE_TABLE(i2c, da9052_i2c_id); 117 118 #ifdef CONFIG_OF 119 static 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 128 129 static 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 } 170 171 static void da9052_i2c_remove(struct i2c_client *client) 172 { 173 struct da9052 *da9052 = i2c_get_clientdata(client); 174 175 da9052_device_exit(da9052); 176 } 177 178 static struct i2c_driver da9052_i2c_driver = { 179 .probe = 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 }; 189 190 static 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 } 202 subsys_initcall(da9052_i2c_init); 203 204 static void __exit da9052_i2c_exit(void) 205 { 206 i2c_del_driver(&da9052_i2c_driver); 207 } 208 module_exit(da9052_i2c_exit); 209 210 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 211 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); 212 MODULE_LICENSE("GPL"); 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