144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
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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 <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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static int da9052_i2c_enable_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 int __devinit 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 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
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if (!da9052)
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return -ENOMEM;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
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__func__);
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ret = -ENODEV;
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goto err;
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}
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da9052->dev = &client->dev;
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da9052->chip_irq = client->irq;
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i2c_set_clientdata(client, da9052);
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da9052->regmap = 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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goto err;
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}
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ret = da9052_i2c_enable_multiwrite(da9052);
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if (ret < 0)
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goto err_regmap;
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ret = da9052_device_init(da9052, id->driver_data);
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if (ret != 0)
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goto err_regmap;
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return 0;
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err_regmap:
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regmap_exit(da9052->regmap);
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err:
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kfree(da9052);
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return ret;
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}
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static int __devexit 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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regmap_exit(da9052->regmap);
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kfree(da9052);
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return 0;
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}
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static 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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{}
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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 = __devexit_p(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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.owner = THIS_MODULE,
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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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