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 */ 23 static 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 */ 55 static 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 */ 86 static 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 } 104 105 static 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 }; 113 MODULE_DEVICE_TABLE(i2c, da9052_i2c_id); 114 115 #ifdef CONFIG_OF 116 static 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 125 126 static 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 } 167 168 static void da9052_i2c_remove(struct i2c_client *client) 169 { 170 struct da9052 *da9052 = i2c_get_clientdata(client); 171 172 da9052_device_exit(da9052); 173 } 174 175 static 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 }; 186 187 static 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 } 199 subsys_initcall(da9052_i2c_init); 200 201 static void __exit da9052_i2c_exit(void) 202 { 203 i2c_del_driver(&da9052_i2c_driver); 204 } 205 module_exit(da9052_i2c_exit); 206 207 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 208 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); 209