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 ret = i2c_master_recv(wm8350->i2c_client, dest, bytes); 34 if (ret < 0) 35 return ret; 36 if (ret != bytes) 37 return -EIO; 38 return 0; 39 } 40 41 static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg, 42 int bytes, void *src) 43 { 44 /* we add 1 byte for device register */ 45 u8 msg[(WM8350_MAX_REGISTER << 1) + 1]; 46 int ret; 47 48 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1)) 49 return -EINVAL; 50 51 msg[0] = reg; 52 memcpy(&msg[1], src, bytes); 53 ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1); 54 if (ret < 0) 55 return ret; 56 if (ret != bytes + 1) 57 return -EIO; 58 return 0; 59 } 60 61 static int wm8350_i2c_probe(struct i2c_client *i2c, 62 const struct i2c_device_id *id) 63 { 64 struct wm8350 *wm8350; 65 int ret = 0; 66 67 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL); 68 if (wm8350 == NULL) { 69 kfree(i2c); 70 return -ENOMEM; 71 } 72 73 i2c_set_clientdata(i2c, wm8350); 74 wm8350->dev = &i2c->dev; 75 wm8350->i2c_client = i2c; 76 wm8350->read_dev = wm8350_i2c_read_device; 77 wm8350->write_dev = wm8350_i2c_write_device; 78 79 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data); 80 if (ret < 0) 81 goto err; 82 83 return ret; 84 85 err: 86 kfree(wm8350); 87 return ret; 88 } 89 90 static int wm8350_i2c_remove(struct i2c_client *i2c) 91 { 92 struct wm8350 *wm8350 = i2c_get_clientdata(i2c); 93 94 wm8350_device_exit(wm8350); 95 kfree(wm8350); 96 97 return 0; 98 } 99 100 static const struct i2c_device_id wm8350_i2c_id[] = { 101 { "wm8350", 0 }, 102 { } 103 }; 104 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id); 105 106 107 static struct i2c_driver wm8350_i2c_driver = { 108 .driver = { 109 .name = "wm8350", 110 .owner = THIS_MODULE, 111 }, 112 .probe = wm8350_i2c_probe, 113 .remove = wm8350_i2c_remove, 114 .id_table = wm8350_i2c_id, 115 }; 116 117 static int __init wm8350_i2c_init(void) 118 { 119 return i2c_add_driver(&wm8350_i2c_driver); 120 } 121 /* init early so consumer devices can complete system boot */ 122 subsys_initcall(wm8350_i2c_init); 123 124 static void __exit wm8350_i2c_exit(void) 125 { 126 i2c_del_driver(&wm8350_i2c_driver); 127 } 128 module_exit(wm8350_i2c_exit); 129 130 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC"); 131 MODULE_LICENSE("GPL"); 132