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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs4 *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 20static 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 57static 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 64static 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 73static 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 79static 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 90static 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 101static 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}111subsys_initcall(wm831x_spi_init);112