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/of.h> 23 #include <linux/of_device.h> 24 #include <linux/regmap.h> 25 26 #include <linux/mfd/wm831x/core.h> 27 #include <linux/mfd/wm831x/pdata.h> 28 29 static int wm831x_i2c_probe(struct i2c_client *i2c, 30 const struct i2c_device_id *id) 31 { 32 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev); 33 const struct of_device_id *of_id; 34 struct wm831x *wm831x; 35 enum wm831x_parent type; 36 int ret; 37 38 if (i2c->dev.of_node) { 39 of_id = of_match_device(wm831x_of_match, &i2c->dev); 40 if (!of_id) { 41 dev_err(&i2c->dev, "Failed to match device\n"); 42 return -ENODEV; 43 } 44 type = (enum wm831x_parent)of_id->data; 45 } else { 46 type = (enum wm831x_parent)id->driver_data; 47 } 48 49 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL); 50 if (wm831x == NULL) 51 return -ENOMEM; 52 53 i2c_set_clientdata(i2c, wm831x); 54 wm831x->dev = &i2c->dev; 55 wm831x->type = type; 56 57 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config); 58 if (IS_ERR(wm831x->regmap)) { 59 ret = PTR_ERR(wm831x->regmap); 60 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 61 ret); 62 return ret; 63 } 64 65 if (pdata) 66 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 67 68 return wm831x_device_init(wm831x, i2c->irq); 69 } 70 71 static int wm831x_i2c_remove(struct i2c_client *i2c) 72 { 73 struct wm831x *wm831x = i2c_get_clientdata(i2c); 74 75 wm831x_device_exit(wm831x); 76 77 return 0; 78 } 79 80 static int wm831x_i2c_suspend(struct device *dev) 81 { 82 struct wm831x *wm831x = dev_get_drvdata(dev); 83 84 return wm831x_device_suspend(wm831x); 85 } 86 87 static int wm831x_i2c_poweroff(struct device *dev) 88 { 89 struct wm831x *wm831x = dev_get_drvdata(dev); 90 91 wm831x_device_shutdown(wm831x); 92 93 return 0; 94 } 95 96 static const struct i2c_device_id wm831x_i2c_id[] = { 97 { "wm8310", WM8310 }, 98 { "wm8311", WM8311 }, 99 { "wm8312", WM8312 }, 100 { "wm8320", WM8320 }, 101 { "wm8321", WM8321 }, 102 { "wm8325", WM8325 }, 103 { "wm8326", WM8326 }, 104 { } 105 }; 106 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id); 107 108 static const struct dev_pm_ops wm831x_pm_ops = { 109 .suspend = wm831x_i2c_suspend, 110 .poweroff = wm831x_i2c_poweroff, 111 }; 112 113 static struct i2c_driver wm831x_i2c_driver = { 114 .driver = { 115 .name = "wm831x", 116 .pm = &wm831x_pm_ops, 117 .of_match_table = of_match_ptr(wm831x_of_match), 118 }, 119 .probe = wm831x_i2c_probe, 120 .remove = wm831x_i2c_remove, 121 .id_table = wm831x_i2c_id, 122 }; 123 124 static int __init wm831x_i2c_init(void) 125 { 126 int ret; 127 128 ret = i2c_add_driver(&wm831x_i2c_driver); 129 if (ret != 0) 130 pr_err("Failed to register wm831x I2C driver: %d\n", ret); 131 132 return ret; 133 } 134 subsys_initcall(wm831x_i2c_init); 135 136 static void __exit wm831x_i2c_exit(void) 137 { 138 i2c_del_driver(&wm831x_i2c_driver); 139 } 140 module_exit(wm831x_i2c_exit); 141