184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam/* 284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * I2C access for DA9052 PMICs. 384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * 484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * Copyright(c) 2011 Dialog Semiconductor Ltd. 584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * 684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * Author: David Dajun Chen <dchen@diasemi.com> 784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * 884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * This program is free software; you can redistribute it and/or modify 984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * it under the terms of the GNU General Public License as published by 1084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * the Free Software Foundation; either version 2 of the License, or 1184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * (at your option) any later version. 1284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam * 1384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam */ 1484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 1584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/device.h> 1684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/module.h> 1784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/input.h> 1884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/mfd/core.h> 1984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/i2c.h> 2084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/err.h> 2184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 2284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/mfd/da9052/da9052.h> 2384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam#include <linux/mfd/da9052/reg.h> 2484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 2584c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic int da9052_i2c_enable_multiwrite(struct da9052 *da9052) 2684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam{ 2784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam int reg_val, ret; 2884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 2984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val); 3084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (ret < 0) 3184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return ret; 3284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 3384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (reg_val & DA9052_CONTROL_B_WRITEMODE) { 3484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam reg_val &= ~DA9052_CONTROL_B_WRITEMODE; 3584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG, 3684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam reg_val); 3784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (ret < 0) 3884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return ret; 3984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam } 4084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 4184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return 0; 4284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam} 4384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 4484c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic int __devinit da9052_i2c_probe(struct i2c_client *client, 4584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam const struct i2c_device_id *id) 4684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam{ 4784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam struct da9052 *da9052; 4884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam int ret; 4984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 5084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL); 5184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (!da9052) 5284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return -ENOMEM; 5384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 5484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (!i2c_check_functionality(client->adapter, 5584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam I2C_FUNC_SMBUS_BYTE_DATA)) { 5684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam dev_info(&client->dev, "Error in %s:i2c_check_functionality\n", 5784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam __func__); 5884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = -ENODEV; 5984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam goto err; 6084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam } 6184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 6284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam da9052->dev = &client->dev; 6384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam da9052->chip_irq = client->irq; 6484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 6584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam i2c_set_clientdata(client, da9052); 6684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 6784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config); 6884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (IS_ERR(da9052->regmap)) { 6984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = PTR_ERR(da9052->regmap); 7084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam dev_err(&client->dev, "Failed to allocate register map: %d\n", 7184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret); 7284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam goto err; 7384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam } 7484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 7584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = da9052_i2c_enable_multiwrite(da9052); 7684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (ret < 0) 774d75dd61dfb53eaa286c54fb121e5b51b106c272Axel Lin goto err_regmap; 7884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 7984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = da9052_device_init(da9052, id->driver_data); 8084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (ret != 0) 814d75dd61dfb53eaa286c54fb121e5b51b106c272Axel Lin goto err_regmap; 8284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 8384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return 0; 8484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 854d75dd61dfb53eaa286c54fb121e5b51b106c272Axel Linerr_regmap: 864d75dd61dfb53eaa286c54fb121e5b51b106c272Axel Lin regmap_exit(da9052->regmap); 8784c99db879314d58e0064f02b481f668f45d0070Ashish Jangamerr: 8884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam kfree(da9052); 8984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return ret; 9084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam} 9184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 92bcc2d6d6fcbee3c07515837b522f6c242f3f99e4Dmitry Torokhovstatic int __devexit da9052_i2c_remove(struct i2c_client *client) 9384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam{ 9484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam struct da9052 *da9052 = i2c_get_clientdata(client); 9584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 9684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam da9052_device_exit(da9052); 974d75dd61dfb53eaa286c54fb121e5b51b106c272Axel Lin regmap_exit(da9052->regmap); 9884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam kfree(da9052); 9984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 10084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return 0; 10184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam} 10284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 10384c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic struct i2c_device_id da9052_i2c_id[] = { 10484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam {"da9052", DA9052}, 10584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam {"da9053-aa", DA9053_AA}, 10684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam {"da9053-ba", DA9053_BA}, 10784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam {"da9053-bb", DA9053_BB}, 10884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam {} 10984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam}; 11084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 11184c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic struct i2c_driver da9052_i2c_driver = { 11284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam .probe = da9052_i2c_probe, 113bcc2d6d6fcbee3c07515837b522f6c242f3f99e4Dmitry Torokhov .remove = __devexit_p(da9052_i2c_remove), 11484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam .id_table = da9052_i2c_id, 11584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam .driver = { 11684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam .name = "da9052", 11784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam .owner = THIS_MODULE, 11884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam }, 11984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam}; 12084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 12184c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic int __init da9052_i2c_init(void) 12284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam{ 12384c99db879314d58e0064f02b481f668f45d0070Ashish Jangam int ret; 12484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 12584c99db879314d58e0064f02b481f668f45d0070Ashish Jangam ret = i2c_add_driver(&da9052_i2c_driver); 12684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam if (ret != 0) { 12784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam pr_err("DA9052 I2C registration failed %d\n", ret); 12884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return ret; 12984c99db879314d58e0064f02b481f668f45d0070Ashish Jangam } 13084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 13184c99db879314d58e0064f02b481f668f45d0070Ashish Jangam return 0; 13284c99db879314d58e0064f02b481f668f45d0070Ashish Jangam} 13384c99db879314d58e0064f02b481f668f45d0070Ashish Jangamsubsys_initcall(da9052_i2c_init); 13484c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 13584c99db879314d58e0064f02b481f668f45d0070Ashish Jangamstatic void __exit da9052_i2c_exit(void) 13684c99db879314d58e0064f02b481f668f45d0070Ashish Jangam{ 13784c99db879314d58e0064f02b481f668f45d0070Ashish Jangam i2c_del_driver(&da9052_i2c_driver); 13884c99db879314d58e0064f02b481f668f45d0070Ashish Jangam} 13984c99db879314d58e0064f02b481f668f45d0070Ashish Jangammodule_exit(da9052_i2c_exit); 14084c99db879314d58e0064f02b481f668f45d0070Ashish Jangam 14184c99db879314d58e0064f02b481f668f45d0070Ashish JangamMODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 14284c99db879314d58e0064f02b481f668f45d0070Ashish JangamMODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); 14384c99db879314d58e0064f02b481f668f45d0070Ashish JangamMODULE_LICENSE("GPL"); 144