1 /* 2 * wm831x-spi.c -- SPI 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/pm.h> 18 #include <linux/spi/spi.h> 19 #include <linux/regmap.h> 20 #include <linux/err.h> 21 22 #include <linux/mfd/wm831x/core.h> 23 24 static int __devinit wm831x_spi_probe(struct spi_device *spi) 25 { 26 const struct spi_device_id *id = spi_get_device_id(spi); 27 struct wm831x *wm831x; 28 enum wm831x_parent type; 29 int ret; 30 31 type = (enum wm831x_parent)id->driver_data; 32 33 wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL); 34 if (wm831x == NULL) 35 return -ENOMEM; 36 37 spi->bits_per_word = 16; 38 spi->mode = SPI_MODE_0; 39 40 dev_set_drvdata(&spi->dev, wm831x); 41 wm831x->dev = &spi->dev; 42 43 wm831x->regmap = regmap_init_spi(spi, &wm831x_regmap_config); 44 if (IS_ERR(wm831x->regmap)) { 45 ret = PTR_ERR(wm831x->regmap); 46 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 47 ret); 48 kfree(wm831x); 49 return ret; 50 } 51 52 return wm831x_device_init(wm831x, type, spi->irq); 53 } 54 55 static int __devexit wm831x_spi_remove(struct spi_device *spi) 56 { 57 struct wm831x *wm831x = dev_get_drvdata(&spi->dev); 58 59 wm831x_device_exit(wm831x); 60 61 return 0; 62 } 63 64 static int wm831x_spi_suspend(struct device *dev) 65 { 66 struct wm831x *wm831x = dev_get_drvdata(dev); 67 68 return wm831x_device_suspend(wm831x); 69 } 70 71 static void wm831x_spi_shutdown(struct spi_device *spi) 72 { 73 struct wm831x *wm831x = dev_get_drvdata(&spi->dev); 74 75 wm831x_device_shutdown(wm831x); 76 } 77 78 static const struct dev_pm_ops wm831x_spi_pm = { 79 .freeze = wm831x_spi_suspend, 80 .suspend = wm831x_spi_suspend, 81 }; 82 83 static const struct spi_device_id wm831x_spi_ids[] = { 84 { "wm8310", WM8310 }, 85 { "wm8311", WM8311 }, 86 { "wm8312", WM8312 }, 87 { "wm8320", WM8320 }, 88 { "wm8321", WM8321 }, 89 { "wm8325", WM8325 }, 90 { "wm8326", WM8326 }, 91 { }, 92 }; 93 MODULE_DEVICE_TABLE(spi, wm831x_spi_id); 94 95 static struct spi_driver wm831x_spi_driver = { 96 .driver = { 97 .name = "wm831x", 98 .bus = &spi_bus_type, 99 .owner = THIS_MODULE, 100 .pm = &wm831x_spi_pm, 101 }, 102 .id_table = wm831x_spi_ids, 103 .probe = wm831x_spi_probe, 104 .remove = __devexit_p(wm831x_spi_remove), 105 .shutdown = wm831x_spi_shutdown, 106 }; 107 108 static int __init wm831x_spi_init(void) 109 { 110 int ret; 111 112 ret = spi_register_driver(&wm831x_spi_driver); 113 if (ret != 0) 114 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 115 116 return 0; 117 } 118 subsys_initcall(wm831x_spi_init); 119 120 static void __exit wm831x_spi_exit(void) 121 { 122 spi_unregister_driver(&wm831x_spi_driver); 123 } 124 module_exit(wm831x_spi_exit); 125 126 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); 127 MODULE_LICENSE("GPL"); 128 MODULE_AUTHOR("Mark Brown"); 129