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 = devm_kzalloc(&spi->dev, 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 = devm_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 return ret; 49 } 50 51 return wm831x_device_init(wm831x, type, spi->irq); 52 } 53 54 static int __devexit wm831x_spi_remove(struct spi_device *spi) 55 { 56 struct wm831x *wm831x = dev_get_drvdata(&spi->dev); 57 58 wm831x_device_exit(wm831x); 59 60 return 0; 61 } 62 63 static int wm831x_spi_suspend(struct device *dev) 64 { 65 struct wm831x *wm831x = dev_get_drvdata(dev); 66 67 return wm831x_device_suspend(wm831x); 68 } 69 70 static void wm831x_spi_shutdown(struct spi_device *spi) 71 { 72 struct wm831x *wm831x = dev_get_drvdata(&spi->dev); 73 74 wm831x_device_shutdown(wm831x); 75 } 76 77 static const struct dev_pm_ops wm831x_spi_pm = { 78 .freeze = wm831x_spi_suspend, 79 .suspend = wm831x_spi_suspend, 80 }; 81 82 static const struct spi_device_id wm831x_spi_ids[] = { 83 { "wm8310", WM8310 }, 84 { "wm8311", WM8311 }, 85 { "wm8312", WM8312 }, 86 { "wm8320", WM8320 }, 87 { "wm8321", WM8321 }, 88 { "wm8325", WM8325 }, 89 { "wm8326", WM8326 }, 90 { }, 91 }; 92 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids); 93 94 static struct spi_driver wm831x_spi_driver = { 95 .driver = { 96 .name = "wm831x", 97 .owner = THIS_MODULE, 98 .pm = &wm831x_spi_pm, 99 }, 100 .id_table = wm831x_spi_ids, 101 .probe = wm831x_spi_probe, 102 .remove = __devexit_p(wm831x_spi_remove), 103 .shutdown = wm831x_spi_shutdown, 104 }; 105 106 static int __init wm831x_spi_init(void) 107 { 108 int ret; 109 110 ret = spi_register_driver(&wm831x_spi_driver); 111 if (ret != 0) 112 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 113 114 return 0; 115 } 116 subsys_initcall(wm831x_spi_init); 117 118 static void __exit wm831x_spi_exit(void) 119 { 120 spi_unregister_driver(&wm831x_spi_driver); 121 } 122 module_exit(wm831x_spi_exit); 123 124 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); 125 MODULE_LICENSE("GPL"); 126 MODULE_AUTHOR("Mark Brown"); 127