167 lines
3.8 KiB
C
167 lines
3.8 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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* @wm8400: pointer to local driver data structure
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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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