1 /* 2 * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs 3 * 4 * Copyright 2009,2010 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 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 #include <linux/err.h> 22 #include <linux/regmap.h> 23 24 #include <linux/mfd/wm831x/core.h> 25 #include <linux/mfd/wm831x/pdata.h> 26 27 static int wm831x_i2c_probe(struct i2c_client *i2c, 28 const struct i2c_device_id *id) 29 { 30 struct wm831x *wm831x; 31 int ret; 32 33 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL); 34 if (wm831x == NULL) 35 return -ENOMEM; 36 37 i2c_set_clientdata(i2c, wm831x); 38 wm831x->dev = &i2c->dev; 39 40 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config); 41 if (IS_ERR(wm831x->regmap)) { 42 ret = PTR_ERR(wm831x->regmap); 43 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 44 ret); 45 return ret; 46 } 47 48 return wm831x_device_init(wm831x, id->driver_data, i2c->irq); 49 } 50 51 static int wm831x_i2c_remove(struct i2c_client *i2c) 52 { 53 struct wm831x *wm831x = i2c_get_clientdata(i2c); 54 55 wm831x_device_exit(wm831x); 56 57 return 0; 58 } 59 60 static int wm831x_i2c_suspend(struct device *dev) 61 { 62 struct wm831x *wm831x = dev_get_drvdata(dev); 63 64 return wm831x_device_suspend(wm831x); 65 } 66 67 static void wm831x_i2c_shutdown(struct i2c_client *i2c) 68 { 69 struct wm831x *wm831x = i2c_get_clientdata(i2c); 70 71 wm831x_device_shutdown(wm831x); 72 } 73 74 static const struct i2c_device_id wm831x_i2c_id[] = { 75 { "wm8310", WM8310 }, 76 { "wm8311", WM8311 }, 77 { "wm8312", WM8312 }, 78 { "wm8320", WM8320 }, 79 { "wm8321", WM8321 }, 80 { "wm8325", WM8325 }, 81 { "wm8326", WM8326 }, 82 { } 83 }; 84 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id); 85 86 static const struct dev_pm_ops wm831x_pm_ops = { 87 .suspend = wm831x_i2c_suspend, 88 }; 89 90 static struct i2c_driver wm831x_i2c_driver = { 91 .driver = { 92 .name = "wm831x", 93 .owner = THIS_MODULE, 94 .pm = &wm831x_pm_ops, 95 }, 96 .probe = wm831x_i2c_probe, 97 .remove = wm831x_i2c_remove, 98 .shutdown = wm831x_i2c_shutdown, 99 .id_table = wm831x_i2c_id, 100 }; 101 102 static int __init wm831x_i2c_init(void) 103 { 104 int ret; 105 106 ret = i2c_add_driver(&wm831x_i2c_driver); 107 if (ret != 0) 108 pr_err("Failed to register wm831x I2C driver: %d\n", ret); 109 110 return ret; 111 } 112 subsys_initcall(wm831x_i2c_init); 113 114 static void __exit wm831x_i2c_exit(void) 115 { 116 i2c_del_driver(&wm831x_i2c_driver); 117 } 118 module_exit(wm831x_i2c_exit); 119