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/of.h> 18 #include <linux/of_device.h> 19 #include <linux/pm.h> 20 #include <linux/spi/spi.h> 21 #include <linux/regmap.h> 22 #include <linux/err.h> 23 24 #include <linux/mfd/wm831x/core.h> 25 26 static int wm831x_spi_probe(struct spi_device *spi) 27 { 28 struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev); 29 const struct spi_device_id *id = spi_get_device_id(spi); 30 const struct of_device_id *of_id; 31 struct wm831x *wm831x; 32 enum wm831x_parent type; 33 int ret; 34 35 if (spi->dev.of_node) { 36 of_id = of_match_device(wm831x_of_match, &spi->dev); 37 type = (enum wm831x_parent)of_id->data; 38 } else { 39 type = (enum wm831x_parent)id->driver_data; 40 } 41 42 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); 43 if (wm831x == NULL) 44 return -ENOMEM; 45 46 spi->mode = SPI_MODE_0; 47 48 spi_set_drvdata(spi, wm831x); 49 wm831x->dev = &spi->dev; 50 wm831x->type = type; 51 52 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config); 53 if (IS_ERR(wm831x->regmap)) { 54 ret = PTR_ERR(wm831x->regmap); 55 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 56 ret); 57 return ret; 58 } 59 60 if (pdata) 61 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 62 63 return wm831x_device_init(wm831x, spi->irq); 64 } 65 66 static int wm831x_spi_remove(struct spi_device *spi) 67 { 68 struct wm831x *wm831x = spi_get_drvdata(spi); 69 70 wm831x_device_exit(wm831x); 71 72 return 0; 73 } 74 75 static int wm831x_spi_suspend(struct device *dev) 76 { 77 struct wm831x *wm831x = dev_get_drvdata(dev); 78 79 return wm831x_device_suspend(wm831x); 80 } 81 82 static int wm831x_spi_poweroff(struct device *dev) 83 { 84 struct wm831x *wm831x = dev_get_drvdata(dev); 85 86 wm831x_device_shutdown(wm831x); 87 88 return 0; 89 } 90 91 static const struct dev_pm_ops wm831x_spi_pm = { 92 .freeze = wm831x_spi_suspend, 93 .suspend = wm831x_spi_suspend, 94 .poweroff = wm831x_spi_poweroff, 95 }; 96 97 static const struct spi_device_id wm831x_spi_ids[] = { 98 { "wm8310", WM8310 }, 99 { "wm8311", WM8311 }, 100 { "wm8312", WM8312 }, 101 { "wm8320", WM8320 }, 102 { "wm8321", WM8321 }, 103 { "wm8325", WM8325 }, 104 { "wm8326", WM8326 }, 105 { }, 106 }; 107 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids); 108 109 static struct spi_driver wm831x_spi_driver = { 110 .driver = { 111 .name = "wm831x", 112 .pm = &wm831x_spi_pm, 113 .of_match_table = of_match_ptr(wm831x_of_match), 114 }, 115 .id_table = wm831x_spi_ids, 116 .probe = wm831x_spi_probe, 117 .remove = wm831x_spi_remove, 118 }; 119 120 static int __init wm831x_spi_init(void) 121 { 122 int ret; 123 124 ret = spi_register_driver(&wm831x_spi_driver); 125 if (ret != 0) 126 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 127 128 return 0; 129 } 130 subsys_initcall(wm831x_spi_init); 131 132 static void __exit wm831x_spi_exit(void) 133 { 134 spi_unregister_driver(&wm831x_spi_driver); 135 } 136 module_exit(wm831x_spi_exit); 137 138 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); 139 MODULE_LICENSE("GPL"); 140 MODULE_AUTHOR("Mark Brown"); 141