2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
165 lines
3.7 KiB
C
165 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Core driver for WM8400.
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*/
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#include <linux/init.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/wm8400-private.h>
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#include <linux/mfd/wm8400-audio.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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static bool wm8400_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case WM8400_INTERRUPT_STATUS_1:
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case WM8400_INTERRUPT_LEVELS:
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case WM8400_SHUTDOWN_REASON:
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return true;
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default:
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return false;
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}
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}
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static int wm8400_register_codec(struct wm8400 *wm8400)
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{
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const struct mfd_cell cell = {
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.name = "wm8400-codec",
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.platform_data = wm8400,
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.pdata_size = sizeof(*wm8400),
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};
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return devm_mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0, NULL);
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}
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/*
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* wm8400_init - Generic initialisation
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*
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* The WM8400 can be configured as either an I2C or SPI device. Probe
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* functions for each bus set up the accessors then call into this to
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* set up the device itself.
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*/
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static int wm8400_init(struct wm8400 *wm8400,
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struct wm8400_platform_data *pdata)
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{
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unsigned int reg;
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int ret;
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dev_set_drvdata(wm8400->dev, wm8400);
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/* Check that this is actually a WM8400 */
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ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, ®);
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if (ret != 0) {
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dev_err(wm8400->dev, "Chip ID register read failed\n");
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return -EIO;
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}
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if (reg != 0x6172) {
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dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
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reg);
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return -ENODEV;
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}
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ret = regmap_read(wm8400->regmap, WM8400_ID, ®);
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if (ret != 0) {
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dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
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return ret;
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}
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reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
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dev_info(wm8400->dev, "WM8400 revision %x\n", reg);
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ret = wm8400_register_codec(wm8400);
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if (ret != 0) {
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dev_err(wm8400->dev, "Failed to register codec\n");
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return ret;
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}
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if (pdata && pdata->platform_init) {
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ret = pdata->platform_init(wm8400->dev);
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if (ret != 0) {
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dev_err(wm8400->dev, "Platform init failed: %d\n",
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ret);
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return ret;
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}
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} else
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dev_warn(wm8400->dev, "No platform initialisation supplied\n");
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return 0;
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}
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static const struct regmap_config wm8400_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = WM8400_REGISTER_COUNT - 1,
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.volatile_reg = wm8400_volatile,
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.cache_type = REGCACHE_RBTREE,
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};
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/**
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* wm8400_reset_codec_reg_cache - Reset cached codec registers to
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* their default values.
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*/
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void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
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{
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regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config);
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}
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EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);
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#if IS_ENABLED(CONFIG_I2C)
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static int wm8400_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct wm8400 *wm8400;
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wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL);
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if (!wm8400)
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return -ENOMEM;
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wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config);
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if (IS_ERR(wm8400->regmap))
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return PTR_ERR(wm8400->regmap);
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wm8400->dev = &i2c->dev;
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i2c_set_clientdata(i2c, wm8400);
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return wm8400_init(wm8400, dev_get_platdata(&i2c->dev));
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}
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static const struct i2c_device_id wm8400_i2c_id[] = {
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{ "wm8400", 0 },
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{ }
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};
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static struct i2c_driver wm8400_i2c_driver = {
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.driver = {
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.name = "WM8400",
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},
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.probe = wm8400_i2c_probe,
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.id_table = wm8400_i2c_id,
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};
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#endif
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static int __init wm8400_driver_init(void)
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{
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int ret = -ENODEV;
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#if IS_ENABLED(CONFIG_I2C)
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ret = i2c_add_driver(&wm8400_i2c_driver);
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if (ret != 0)
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pr_err("Failed to register I2C driver: %d\n", ret);
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#endif
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return ret;
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}
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subsys_initcall(wm8400_driver_init);
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