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213 lines
4.7 KiB
213 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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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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MODULE_DEVICE_TABLE(i2c, da9052_i2c_id); |
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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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id = of_device_get_match_data(&client->dev); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); |
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MODULE_LICENSE("GPL");
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