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/init.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 if (!of_id) { 38 dev_err(&spi->dev, "Failed to match device\n"); 39 return -ENODEV; 40 } 41 type = (enum wm831x_parent)of_id->data; 42 } else { 43 type = (enum wm831x_parent)id->driver_data; 44 } 45 46 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); 47 if (wm831x == NULL) 48 return -ENOMEM; 49 50 spi->mode = SPI_MODE_0; 51 52 spi_set_drvdata(spi, wm831x); 53 wm831x->dev = &spi->dev; 54 wm831x->type = type; 55 56 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config); 57 if (IS_ERR(wm831x->regmap)) { 58 ret = PTR_ERR(wm831x->regmap); 59 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 60 ret); 61 return ret; 62 } 63 64 if (pdata) 65 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 66 67 return wm831x_device_init(wm831x, spi->irq); 68 } 69 70 static int wm831x_spi_suspend(struct device *dev) 71 { 72 struct wm831x *wm831x = dev_get_drvdata(dev); 73 74 return wm831x_device_suspend(wm831x); 75 } 76 77 static int wm831x_spi_poweroff(struct device *dev) 78 { 79 struct wm831x *wm831x = dev_get_drvdata(dev); 80 81 wm831x_device_shutdown(wm831x); 82 83 return 0; 84 } 85 86 static const struct dev_pm_ops wm831x_spi_pm = { 87 .freeze = wm831x_spi_suspend, 88 .suspend = wm831x_spi_suspend, 89 .poweroff = wm831x_spi_poweroff, 90 }; 91 92 static const struct spi_device_id wm831x_spi_ids[] = { 93 { "wm8310", WM8310 }, 94 { "wm8311", WM8311 }, 95 { "wm8312", WM8312 }, 96 { "wm8320", WM8320 }, 97 { "wm8321", WM8321 }, 98 { "wm8325", WM8325 }, 99 { "wm8326", WM8326 }, 100 { }, 101 }; 102 103 static struct spi_driver wm831x_spi_driver = { 104 .driver = { 105 .name = "wm831x", 106 .pm = &wm831x_spi_pm, 107 .of_match_table = of_match_ptr(wm831x_of_match), 108 .suppress_bind_attrs = true, 109 }, 110 .id_table = wm831x_spi_ids, 111 .probe = wm831x_spi_probe, 112 }; 113 114 static int __init wm831x_spi_init(void) 115 { 116 int ret; 117 118 ret = spi_register_driver(&wm831x_spi_driver); 119 if (ret != 0) 120 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 121 122 return 0; 123 } 124 subsys_initcall(wm831x_spi_init); 125