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![Mark Brown](/assets/img/avatar_default.png)
Currently the MFD core supports remapping MFD cell interrupts using an irqdomain but only if the MFD is being instantiated using device tree and only if the device tree bindings use the pattern of registering IPs in the device tree with compatible properties. This will be actively harmful for drivers which support non-DT platforms and use this pattern for their DT bindings as it will mean that the core will silently change remapping behaviour and it is also limiting for drivers which don't do DT with this particular pattern. There is also a potential fragility if there are interrupts not associated with MFD cells and all the cells are omitted from the device tree for some reason. Instead change the code to take an IRQ domain as an optional argument, allowing drivers to take the decision about the parent domain for their interrupts. The one current user of this feature is ab8500-core, it has the domain lookup pushed out into the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
240 lines
5.3 KiB
C
240 lines
5.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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*/
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#include <linux/module.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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/**
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* wm8400_reg_read - Single register read
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*
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* @wm8400: Pointer to wm8400 control structure
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* @reg: Register to read
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*
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* @return Read value
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*/
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u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg)
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{
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unsigned int val;
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int ret;
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ret = regmap_read(wm8400->regmap, reg, &val);
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if (ret < 0)
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return ret;
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return val;
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}
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EXPORT_SYMBOL_GPL(wm8400_reg_read);
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int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
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{
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return regmap_bulk_read(wm8400->regmap, reg, data, count);
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}
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EXPORT_SYMBOL_GPL(wm8400_block_read);
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static int wm8400_register_codec(struct wm8400 *wm8400)
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{
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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 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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goto err_children;
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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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goto err_children;
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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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err_children:
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mfd_remove_devices(wm8400->dev);
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return ret;
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}
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static void wm8400_release(struct wm8400 *wm8400)
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{
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mfd_remove_devices(wm8400->dev);
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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 defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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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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int ret;
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wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL);
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if (wm8400 == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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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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ret = PTR_ERR(wm8400->regmap);
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goto err;
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}
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wm8400->dev = &i2c->dev;
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i2c_set_clientdata(i2c, wm8400);
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ret = wm8400_init(wm8400, i2c->dev.platform_data);
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if (ret != 0)
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goto err;
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return 0;
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err:
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return ret;
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}
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static int wm8400_i2c_remove(struct i2c_client *i2c)
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{
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struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
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wm8400_release(wm8400);
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return 0;
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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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MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id);
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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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.owner = THIS_MODULE,
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},
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.probe = wm8400_i2c_probe,
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.remove = wm8400_i2c_remove,
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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_module_init(void)
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{
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int ret = -ENODEV;
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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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_module_init);
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static void __exit wm8400_module_exit(void)
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{
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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i2c_del_driver(&wm8400_i2c_driver);
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#endif
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}
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module_exit(wm8400_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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