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