223 lines
4.9 KiB
C
223 lines
4.9 KiB
C
/*
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* I2C access for DA9052 PMICs.
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*
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* Copyright(c) 2011 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/mfd/core.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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#ifdef CONFIG_OF
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#include <linux/of.h>
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#include <linux/of_device.h>
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#endif
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/* I2C safe register check */
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static inline bool i2c_safe_reg(unsigned char reg)
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{
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switch (reg) {
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case DA9052_STATUS_A_REG:
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case DA9052_STATUS_B_REG:
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case DA9052_STATUS_C_REG:
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case DA9052_STATUS_D_REG:
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case DA9052_ADC_RES_L_REG:
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case DA9052_ADC_RES_H_REG:
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case DA9052_VDD_RES_REG:
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case DA9052_ICHG_AV_REG:
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case DA9052_TBAT_RES_REG:
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case DA9052_ADCIN4_RES_REG:
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case DA9052_ADCIN5_RES_REG:
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case DA9052_ADCIN6_RES_REG:
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case DA9052_TJUNC_RES_REG:
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case DA9052_TSI_X_MSB_REG:
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case DA9052_TSI_Y_MSB_REG:
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case DA9052_TSI_LSB_REG:
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case DA9052_TSI_Z_MSB_REG:
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return true;
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default:
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return false;
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}
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}
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/*
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* There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
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* gets lockup up or fails to respond following a system reset.
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* This fix is to follow any read or write with a dummy read to a safe
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* register.
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*/
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static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
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{
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int val;
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switch (da9052->chip_id) {
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case DA9052:
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case DA9053_AA:
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case DA9053_BA:
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case DA9053_BB:
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/* A dummy read to a safe register address. */
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if (!i2c_safe_reg(reg))
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return regmap_read(da9052->regmap,
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DA9052_PARK_REGISTER,
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&val);
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break;
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case DA9053_BC:
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default:
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/*
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* For other chips parking of I2C register
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* to a safe place is not required.
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*/
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break;
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}
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return 0;
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}
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/*
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* According to errata item 24, multiwrite mode should be avoided
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* in order to prevent register data corruption after power-down.
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*/
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static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
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{
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int reg_val, ret;
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ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
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if (ret < 0)
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return ret;
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if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
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reg_val |= DA9052_CONTROL_B_WRITEMODE;
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ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
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reg_val);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static const struct i2c_device_id da9052_i2c_id[] = {
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{"da9052", DA9052},
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{"da9053-aa", DA9053_AA},
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{"da9053-ba", DA9053_BA},
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{"da9053-bb", DA9053_BB},
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{"da9053-bc", DA9053_BC},
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{}
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};
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#ifdef CONFIG_OF
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static const struct of_device_id dialog_dt_ids[] = {
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{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
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{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
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{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
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{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
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{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
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{ /* sentinel */ }
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};
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#endif
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static int da9052_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct da9052 *da9052;
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int ret;
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da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
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if (!da9052)
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return -ENOMEM;
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da9052->dev = &client->dev;
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da9052->chip_irq = client->irq;
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da9052->fix_io = da9052_i2c_fix;
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i2c_set_clientdata(client, da9052);
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da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
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if (IS_ERR(da9052->regmap)) {
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ret = PTR_ERR(da9052->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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ret = da9052_i2c_disable_multiwrite(da9052);
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if (ret < 0)
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return ret;
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#ifdef CONFIG_OF
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if (!id) {
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struct device_node *np = client->dev.of_node;
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const struct of_device_id *deviceid;
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deviceid = of_match_node(dialog_dt_ids, np);
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id = deviceid->data;
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}
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#endif
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if (!id) {
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ret = -ENODEV;
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dev_err(&client->dev, "id is null.\n");
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return ret;
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}
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return da9052_device_init(da9052, id->driver_data);
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}
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static int da9052_i2c_remove(struct i2c_client *client)
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{
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struct da9052 *da9052 = i2c_get_clientdata(client);
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da9052_device_exit(da9052);
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return 0;
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}
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static struct i2c_driver da9052_i2c_driver = {
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.probe = da9052_i2c_probe,
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.remove = da9052_i2c_remove,
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.id_table = da9052_i2c_id,
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.driver = {
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.name = "da9052",
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#ifdef CONFIG_OF
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.of_match_table = dialog_dt_ids,
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#endif
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},
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};
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static int __init da9052_i2c_init(void)
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{
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int ret;
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ret = i2c_add_driver(&da9052_i2c_driver);
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if (ret != 0) {
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pr_err("DA9052 I2C registration failed %d\n", ret);
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return ret;
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}
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return 0;
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}
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subsys_initcall(da9052_i2c_init);
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static void __exit da9052_i2c_exit(void)
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{
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i2c_del_driver(&da9052_i2c_driver);
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}
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module_exit(da9052_i2c_exit);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
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MODULE_LICENSE("GPL");
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