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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 PMIC51 * 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 safe53 * 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 register74 * 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 avoided84 * 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_OF116static 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#endif125 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_OF155 if (!id)156 id = of_device_get_match_data(&client->dev);157#endif158 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_OF182 .of_match_table = dialog_dt_ids,183#endif184 },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");209