1 /* 2 * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC 3 * 4 * This driver defines and configures the WM8350 for the Freescale i.MX32ADS. 5 * 6 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 7 * 8 * Author: Liam Girdwood 9 * linux@wolfsonmicro.com 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 * 16 */ 17 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/init.h> 21 #include <linux/i2c.h> 22 #include <linux/platform_device.h> 23 #include <linux/mfd/wm8350/core.h> 24 25 static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg, 26 int bytes, void *dest) 27 { 28 int ret; 29 30 ret = i2c_master_send(wm8350->i2c_client, ®, 1); 31 if (ret < 0) 32 return ret; 33 return i2c_master_recv(wm8350->i2c_client, dest, bytes); 34 } 35 36 static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg, 37 int bytes, void *src) 38 { 39 /* we add 1 byte for device register */ 40 u8 msg[(WM8350_MAX_REGISTER << 1) + 1]; 41 42 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1)) 43 return -EINVAL; 44 45 msg[0] = reg; 46 memcpy(&msg[1], src, bytes); 47 return i2c_master_send(wm8350->i2c_client, msg, bytes + 1); 48 } 49 50 static int wm8350_i2c_probe(struct i2c_client *i2c, 51 const struct i2c_device_id *id) 52 { 53 struct wm8350 *wm8350; 54 int ret = 0; 55 56 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL); 57 if (wm8350 == NULL) { 58 kfree(i2c); 59 return -ENOMEM; 60 } 61 62 i2c_set_clientdata(i2c, wm8350); 63 wm8350->dev = &i2c->dev; 64 wm8350->i2c_client = i2c; 65 wm8350->read_dev = wm8350_i2c_read_device; 66 wm8350->write_dev = wm8350_i2c_write_device; 67 68 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data); 69 if (ret < 0) 70 goto err; 71 72 return ret; 73 74 err: 75 kfree(wm8350); 76 return ret; 77 } 78 79 static int wm8350_i2c_remove(struct i2c_client *i2c) 80 { 81 struct wm8350 *wm8350 = i2c_get_clientdata(i2c); 82 83 wm8350_device_exit(wm8350); 84 kfree(wm8350); 85 86 return 0; 87 } 88 89 static const struct i2c_device_id wm8350_i2c_id[] = { 90 { "wm8350", 0 }, 91 { } 92 }; 93 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id); 94 95 96 static struct i2c_driver wm8350_i2c_driver = { 97 .driver = { 98 .name = "wm8350", 99 .owner = THIS_MODULE, 100 }, 101 .probe = wm8350_i2c_probe, 102 .remove = wm8350_i2c_remove, 103 .id_table = wm8350_i2c_id, 104 }; 105 106 static int __init wm8350_i2c_init(void) 107 { 108 return i2c_add_driver(&wm8350_i2c_driver); 109 } 110 /* init early so consumer devices can complete system boot */ 111 subsys_initcall(wm8350_i2c_init); 112 113 static void __exit wm8350_i2c_exit(void) 114 { 115 i2c_del_driver(&wm8350_i2c_driver); 116 } 117 module_exit(wm8350_i2c_exit); 118 119 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC"); 120 MODULE_LICENSE("GPL"); 121