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