1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs 4 * 5 * Copyright 2009,2010 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/of.h> 13 #include <linux/of_device.h> 14 #include <linux/pm.h> 15 #include <linux/spi/spi.h> 16 #include <linux/regmap.h> 17 #include <linux/err.h> 18 19 #include <linux/mfd/wm831x/core.h> 20 21 static int wm831x_spi_probe(struct spi_device *spi) 22 { 23 struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev); 24 const struct spi_device_id *id = spi_get_device_id(spi); 25 const struct of_device_id *of_id; 26 struct wm831x *wm831x; 27 enum wm831x_parent type; 28 int ret; 29 30 if (spi->dev.of_node) { 31 of_id = of_match_device(wm831x_of_match, &spi->dev); 32 if (!of_id) { 33 dev_err(&spi->dev, "Failed to match device\n"); 34 return -ENODEV; 35 } 36 type = (uintptr_t)of_id->data; 37 } else { 38 type = (enum wm831x_parent)id->driver_data; 39 } 40 41 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); 42 if (wm831x == NULL) 43 return -ENOMEM; 44 45 spi->mode = SPI_MODE_0; 46 47 spi_set_drvdata(spi, wm831x); 48 wm831x->dev = &spi->dev; 49 wm831x->type = type; 50 51 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config); 52 if (IS_ERR(wm831x->regmap)) { 53 ret = PTR_ERR(wm831x->regmap); 54 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 55 ret); 56 return ret; 57 } 58 59 if (pdata) 60 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 61 62 return wm831x_device_init(wm831x, spi->irq); 63 } 64 65 static int wm831x_spi_suspend(struct device *dev) 66 { 67 struct wm831x *wm831x = dev_get_drvdata(dev); 68 69 return wm831x_device_suspend(wm831x); 70 } 71 72 static int wm831x_spi_poweroff(struct device *dev) 73 { 74 struct wm831x *wm831x = dev_get_drvdata(dev); 75 76 wm831x_device_shutdown(wm831x); 77 78 return 0; 79 } 80 81 static const struct dev_pm_ops wm831x_spi_pm = { 82 .freeze = wm831x_spi_suspend, 83 .suspend = wm831x_spi_suspend, 84 .poweroff = wm831x_spi_poweroff, 85 }; 86 87 static const struct spi_device_id wm831x_spi_ids[] = { 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 struct spi_driver wm831x_spi_driver = { 99 .driver = { 100 .name = "wm831x", 101 .pm = &wm831x_spi_pm, 102 .of_match_table = of_match_ptr(wm831x_of_match), 103 .suppress_bind_attrs = true, 104 }, 105 .id_table = wm831x_spi_ids, 106 .probe = wm831x_spi_probe, 107 }; 108 109 static int __init wm831x_spi_init(void) 110 { 111 int ret; 112 113 ret = spi_register_driver(&wm831x_spi_driver); 114 if (ret != 0) 115 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 116 117 return 0; 118 } 119 subsys_initcall(wm831x_spi_init); 120