1 /* 2 * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * 6 * Author: Liam Girdwood 7 * linux@wolfsonmicro.com 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/moduleparam.h> 18 #include <linux/init.h> 19 #include <linux/i2c.h> 20 #include <linux/platform_device.h> 21 #include <linux/mfd/wm8350/core.h> 22 23 static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg, 24 int bytes, void *dest) 25 { 26 int ret; 27 28 ret = i2c_master_send(wm8350->i2c_client, ®, 1); 29 if (ret < 0) 30 return ret; 31 ret = i2c_master_recv(wm8350->i2c_client, dest, bytes); 32 if (ret < 0) 33 return ret; 34 if (ret != bytes) 35 return -EIO; 36 return 0; 37 } 38 39 static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg, 40 int bytes, void *src) 41 { 42 /* we add 1 byte for device register */ 43 u8 msg[(WM8350_MAX_REGISTER << 1) + 1]; 44 int ret; 45 46 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1)) 47 return -EINVAL; 48 49 msg[0] = reg; 50 memcpy(&msg[1], src, bytes); 51 ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1); 52 if (ret < 0) 53 return ret; 54 if (ret != bytes + 1) 55 return -EIO; 56 return 0; 57 } 58 59 static int wm8350_i2c_probe(struct i2c_client *i2c, 60 const struct i2c_device_id *id) 61 { 62 struct wm8350 *wm8350; 63 int ret = 0; 64 65 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL); 66 if (wm8350 == NULL) { 67 kfree(i2c); 68 return -ENOMEM; 69 } 70 71 i2c_set_clientdata(i2c, wm8350); 72 wm8350->dev = &i2c->dev; 73 wm8350->i2c_client = i2c; 74 wm8350->read_dev = wm8350_i2c_read_device; 75 wm8350->write_dev = wm8350_i2c_write_device; 76 77 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data); 78 if (ret < 0) 79 goto err; 80 81 return ret; 82 83 err: 84 kfree(wm8350); 85 return ret; 86 } 87 88 static int wm8350_i2c_remove(struct i2c_client *i2c) 89 { 90 struct wm8350 *wm8350 = i2c_get_clientdata(i2c); 91 92 wm8350_device_exit(wm8350); 93 kfree(wm8350); 94 95 return 0; 96 } 97 98 static const struct i2c_device_id wm8350_i2c_id[] = { 99 { "wm8350", 0 }, 100 { "wm8351", 0 }, 101 { "wm8352", 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