projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e5b48684 MB |
1 | /* |
| 2 | * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs | |
| 3 | * | |
| 4 | * Copyright 2009,2010 Wolfson Microelectronics PLC. | |
| 5 | * | |
| 6 | * Author: Mark Brown <[email protected]> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify it | |
| 9 | * under the terms of the GNU General Public License as published by the | |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 11 | * option) any later version. | |
| 12 | * | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/kernel.h> | |
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/i2c.h> | |
| 18 | #include <linux/delay.h> | |
| 19 | #include <linux/mfd/core.h> | |
| 20 | #include <linux/slab.h> | |
| 21 | ||
| 22 | #include <linux/mfd/wm831x/core.h> | |
| 23 | #include <linux/mfd/wm831x/pdata.h> | |
| 24 | ||
| 25 | static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg, | |
| 26 | int bytes, void *dest) | |
| 27 | { | |
| 28 | struct i2c_client *i2c = wm831x->control_data; | |
| 29 | int ret; | |
| 30 | u16 r = cpu_to_be16(reg); | |
| 31 | ||
| 32 | ret = i2c_master_send(i2c, (unsigned char *)&r, 2); | |
| 33 | if (ret < 0) | |
| 34 | return ret; | |
| 35 | if (ret != 2) | |
| 36 | return -EIO; | |
| 37 | ||
| 38 | ret = i2c_master_recv(i2c, dest, bytes); | |
| 39 | if (ret < 0) | |
| 40 | return ret; | |
| 41 | if (ret != bytes) | |
| 42 | return -EIO; | |
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| 46 | /* Currently we allocate the write buffer on the stack; this is OK for | |
| 47 | * small writes - if we need to do large writes this will need to be | |
| 48 | * revised. | |
| 49 | */ | |
| 50 | static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg, | |
| 51 | int bytes, void *src) | |
| 52 | { | |
| 53 | struct i2c_client *i2c = wm831x->control_data; | |
| 54 | unsigned char msg[bytes + 2]; | |
| 55 | int ret; | |
| 56 | ||
| 57 | reg = cpu_to_be16(reg); | |
| 58 | memcpy(&msg[0], ®, 2); | |
| 59 | memcpy(&msg[2], src, bytes); | |
| 60 | ||
| 61 | ret = i2c_master_send(i2c, msg, bytes + 2); | |
| 62 | if (ret < 0) | |
| 63 | return ret; | |
| 64 | if (ret < bytes + 2) | |
| 65 | return -EIO; | |
| 66 | ||
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| 70 | static int wm831x_i2c_probe(struct i2c_client *i2c, | |
| 71 | const struct i2c_device_id *id) | |
| 72 | { | |
| 73 | struct wm831x *wm831x; | |
| 74 | ||
| 75 | wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL); | |
| 76 | if (wm831x == NULL) | |
| 77 | return -ENOMEM; | |
| 78 | ||
| 79 | i2c_set_clientdata(i2c, wm831x); | |
| 80 | wm831x->dev = &i2c->dev; | |
| 81 | wm831x->control_data = i2c; | |
| 82 | wm831x->read_dev = wm831x_i2c_read_device; | |
| 83 | wm831x->write_dev = wm831x_i2c_write_device; | |
| 84 | ||
| 85 | return wm831x_device_init(wm831x, id->driver_data, i2c->irq); | |
| 86 | } | |
| 87 | ||
| 88 | static int wm831x_i2c_remove(struct i2c_client *i2c) | |
| 89 | { | |
| 90 | struct wm831x *wm831x = i2c_get_clientdata(i2c); | |
| 91 | ||
| 92 | wm831x_device_exit(wm831x); | |
| 93 | ||
| 94 | return 0; | |
| 95 | } | |
| 96 | ||
| 97 | static int wm831x_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg) | |
| 98 | { | |
| 99 | struct wm831x *wm831x = i2c_get_clientdata(i2c); | |
| 100 | ||
| 101 | return wm831x_device_suspend(wm831x); | |
| 102 | } | |
| 103 | ||
| 104 | static const struct i2c_device_id wm831x_i2c_id[] = { | |
| 105 | { "wm8310", WM8310 }, | |
| 106 | { "wm8311", WM8311 }, | |
| 107 | { "wm8312", WM8312 }, | |
| 108 | { "wm8320", WM8320 }, | |
| 109 | { "wm8321", WM8321 }, | |
| 110 | { "wm8325", WM8325 }, | |
| 111 | { } | |
| 112 | }; | |
| 113 | MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id); | |
| 114 | ||
| 115 | ||
| 116 | static struct i2c_driver wm831x_i2c_driver = { | |
| 117 | .driver = { | |
| 118 | .name = "wm831x", | |
| 119 | .owner = THIS_MODULE, | |
| 120 | }, | |
| 121 | .probe = wm831x_i2c_probe, | |
| 122 | .remove = wm831x_i2c_remove, | |
| 123 | .suspend = wm831x_i2c_suspend, | |
| 124 | .id_table = wm831x_i2c_id, | |
| 125 | }; | |
| 126 | ||
| 127 | static int __init wm831x_i2c_init(void) | |
| 128 | { | |
| 129 | int ret; | |
| 130 | ||
| 131 | ret = i2c_add_driver(&wm831x_i2c_driver); | |
| 132 | if (ret != 0) | |
| 133 | pr_err("Failed to register wm831x I2C driver: %d\n", ret); | |
| 134 | ||
| 135 | return ret; | |
| 136 | } | |
| 137 | subsys_initcall(wm831x_i2c_init); | |
| 138 | ||
| 139 | static void __exit wm831x_i2c_exit(void) | |
| 140 | { | |
| 141 | i2c_del_driver(&wm831x_i2c_driver); | |
| 142 | } | |
| 143 | module_exit(wm831x_i2c_exit); |