133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
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*
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* Copyright 2007, 2008 Wolfson Microelectronics PLC.
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*
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* Author: Liam Girdwood
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* linux@wolfsonmicro.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/slab.h>
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static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
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int bytes, void *dest)
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{
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int ret;
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ret = i2c_master_send(wm8350->i2c_client, ®, 1);
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if (ret < 0)
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return ret;
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ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
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if (ret < 0)
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return ret;
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if (ret != bytes)
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return -EIO;
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return 0;
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}
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static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
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int bytes, void *src)
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{
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/* we add 1 byte for device register */
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u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
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int ret;
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if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
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return -EINVAL;
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msg[0] = reg;
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memcpy(&msg[1], src, bytes);
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ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
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if (ret < 0)
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return ret;
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if (ret != bytes + 1)
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return -EIO;
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return 0;
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}
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static int wm8350_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct wm8350 *wm8350;
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int ret = 0;
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wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
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if (wm8350 == NULL) {
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kfree(i2c);
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return -ENOMEM;
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}
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i2c_set_clientdata(i2c, wm8350);
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wm8350->dev = &i2c->dev;
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wm8350->i2c_client = i2c;
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wm8350->read_dev = wm8350_i2c_read_device;
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wm8350->write_dev = wm8350_i2c_write_device;
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ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
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if (ret < 0)
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goto err;
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return ret;
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err:
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kfree(wm8350);
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return ret;
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}
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static int wm8350_i2c_remove(struct i2c_client *i2c)
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{
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struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
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wm8350_device_exit(wm8350);
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kfree(wm8350);
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return 0;
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}
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static const struct i2c_device_id wm8350_i2c_id[] = {
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{ "wm8350", 0 },
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{ "wm8351", 0 },
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{ "wm8352", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
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static struct i2c_driver wm8350_i2c_driver = {
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.driver = {
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.name = "wm8350",
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.owner = THIS_MODULE,
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},
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.probe = wm8350_i2c_probe,
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.remove = wm8350_i2c_remove,
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.id_table = wm8350_i2c_id,
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};
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static int __init wm8350_i2c_init(void)
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{
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return i2c_add_driver(&wm8350_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(wm8350_i2c_init);
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static void __exit wm8350_i2c_exit(void)
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{
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i2c_del_driver(&wm8350_i2c_driver);
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}
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module_exit(wm8350_i2c_exit);
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MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
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MODULE_LICENSE("GPL");
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