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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | /* * 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> 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"); |