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/init.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_suspend(struct device *dev) 72 { 73 struct wm831x *wm831x = dev_get_drvdata(dev); 74 75 return wm831x_device_suspend(wm831x); 76 } 77 78 static int wm831x_i2c_poweroff(struct device *dev) 79 { 80 struct wm831x *wm831x = dev_get_drvdata(dev); 81 82 wm831x_device_shutdown(wm831x); 83 84 return 0; 85 } 86 87 static const struct i2c_device_id wm831x_i2c_id[] = { 88 { "wm8310", WM8310 }, 89 { "wm8311", WM8311 }, 90 { "wm8312", WM8312 }, 91 { "wm8320", WM8320 }, 92 { "wm8321", WM8321 }, 93 { "wm8325", WM8325 }, 94 { "wm8326", WM8326 }, 95 { } 96 }; 97 98 static const struct dev_pm_ops wm831x_pm_ops = { 99 .suspend = wm831x_i2c_suspend, 100 .poweroff = wm831x_i2c_poweroff, 101 }; 102 103 static struct i2c_driver wm831x_i2c_driver = { 104 .driver = { 105 .name = "wm831x", 106 .pm = &wm831x_pm_ops, 107 .of_match_table = of_match_ptr(wm831x_of_match), 108 .suppress_bind_attrs = true, 109 }, 110 .probe = wm831x_i2c_probe, 111 .id_table = wm831x_i2c_id, 112 }; 113 114 static int __init wm831x_i2c_init(void) 115 { 116 int ret; 117 118 ret = i2c_add_driver(&wm831x_i2c_driver); 119 if (ret != 0) 120 pr_err("Failed to register wm831x I2C driver: %d\n", ret); 121 122 return ret; 123 } 124 subsys_initcall(wm831x_i2c_init); 125