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/pm.h> 14 #include <linux/spi/spi.h> 15 #include <linux/regmap.h> 16 #include <linux/err.h> 17 18 #include <linux/mfd/wm831x/core.h> 19 20 static int wm831x_spi_probe(struct spi_device *spi) 21 { 22 struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev); 23 struct wm831x *wm831x; 24 enum wm831x_parent type; 25 int ret; 26 27 type = (uintptr_t)spi_get_device_match_data(spi); 28 if (!type) { 29 dev_err(&spi->dev, "Failed to match device\n"); 30 return -ENODEV; 31 } 32 33 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); 34 if (wm831x == NULL) 35 return -ENOMEM; 36 37 spi->mode = SPI_MODE_0; 38 39 spi_set_drvdata(spi, wm831x); 40 wm831x->dev = &spi->dev; 41 wm831x->type = type; 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 if (pdata) 52 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 53 54 return wm831x_device_init(wm831x, spi->irq); 55 } 56 57 static int wm831x_spi_suspend(struct device *dev) 58 { 59 struct wm831x *wm831x = dev_get_drvdata(dev); 60 61 return wm831x_device_suspend(wm831x); 62 } 63 64 static int wm831x_spi_poweroff(struct device *dev) 65 { 66 struct wm831x *wm831x = dev_get_drvdata(dev); 67 68 wm831x_device_shutdown(wm831x); 69 70 return 0; 71 } 72 73 static const struct dev_pm_ops wm831x_spi_pm = { 74 .freeze = wm831x_spi_suspend, 75 .suspend = wm831x_spi_suspend, 76 .poweroff = wm831x_spi_poweroff, 77 }; 78 79 static const struct spi_device_id wm831x_spi_ids[] = { 80 { "wm8310", WM8310 }, 81 { "wm8311", WM8311 }, 82 { "wm8312", WM8312 }, 83 { "wm8320", WM8320 }, 84 { "wm8321", WM8321 }, 85 { "wm8325", WM8325 }, 86 { "wm8326", WM8326 }, 87 { }, 88 }; 89 90 static struct spi_driver wm831x_spi_driver = { 91 .driver = { 92 .name = "wm831x", 93 .pm = &wm831x_spi_pm, 94 .of_match_table = of_match_ptr(wm831x_of_match), 95 .suppress_bind_attrs = true, 96 }, 97 .id_table = wm831x_spi_ids, 98 .probe = wm831x_spi_probe, 99 }; 100 101 static int __init wm831x_spi_init(void) 102 { 103 int ret; 104 105 ret = spi_register_driver(&wm831x_spi_driver); 106 if (ret != 0) 107 pr_err("Failed to register WM831x SPI driver: %d\n", ret); 108 109 return 0; 110 } 111 subsys_initcall(wm831x_spi_init); 112