| /* |
| * Core driver for WM8400. |
| * |
| * Copyright 2008 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * |
| * 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. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/bug.h> |
| #include <linux/err.h> |
| #include <linux/i2c.h> |
| #include <linux/kernel.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/wm8400-private.h> |
| #include <linux/mfd/wm8400-audio.h> |
| #include <linux/regmap.h> |
| #include <linux/slab.h> |
| |
| static bool wm8400_volatile(struct device *dev, unsigned int reg) |
| { |
| switch (reg) { |
| case WM8400_INTERRUPT_STATUS_1: |
| case WM8400_INTERRUPT_LEVELS: |
| case WM8400_SHUTDOWN_REASON: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * wm8400_reg_read - Single register read |
| * |
| * @wm8400: Pointer to wm8400 control structure |
| * @reg: Register to read |
| * |
| * @return Read value |
| */ |
| u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg) |
| { |
| unsigned int val; |
| int ret; |
| |
| ret = regmap_read(wm8400->regmap, reg, &val); |
| if (ret < 0) |
| return ret; |
| |
| return val; |
| } |
| EXPORT_SYMBOL_GPL(wm8400_reg_read); |
| |
| int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data) |
| { |
| return regmap_bulk_read(wm8400->regmap, reg, data, count); |
| } |
| |
| static int wm8400_register_codec(struct wm8400 *wm8400) |
| { |
| struct mfd_cell cell = { |
| .name = "wm8400-codec", |
| .platform_data = wm8400, |
| .pdata_size = sizeof(*wm8400), |
| }; |
| |
| return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0); |
| } |
| |
| /* |
| * wm8400_init - Generic initialisation |
| * |
| * The WM8400 can be configured as either an I2C or SPI device. Probe |
| * functions for each bus set up the accessors then call into this to |
| * set up the device itself. |
| */ |
| static int wm8400_init(struct wm8400 *wm8400, |
| struct wm8400_platform_data *pdata) |
| { |
| unsigned int reg; |
| int ret; |
| |
| dev_set_drvdata(wm8400->dev, wm8400); |
| |
| /* Check that this is actually a WM8400 */ |
| ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, ®); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Chip ID register read failed\n"); |
| return -EIO; |
| } |
| if (reg != 0x6172) { |
| dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", |
| reg); |
| return -ENODEV; |
| } |
| |
| ret = regmap_read(wm8400->regmap, WM8400_ID, ®); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "ID register read failed: %d\n", ret); |
| return ret; |
| } |
| reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; |
| dev_info(wm8400->dev, "WM8400 revision %x\n", reg); |
| |
| ret = wm8400_register_codec(wm8400); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Failed to register codec\n"); |
| goto err_children; |
| } |
| |
| if (pdata && pdata->platform_init) { |
| ret = pdata->platform_init(wm8400->dev); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Platform init failed: %d\n", |
| ret); |
| goto err_children; |
| } |
| } else |
| dev_warn(wm8400->dev, "No platform initialisation supplied\n"); |
| |
| return 0; |
| |
| err_children: |
| mfd_remove_devices(wm8400->dev); |
| return ret; |
| } |
| |
| static void wm8400_release(struct wm8400 *wm8400) |
| { |
| mfd_remove_devices(wm8400->dev); |
| } |
| |
| static const struct regmap_config wm8400_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 16, |
| .max_register = WM8400_REGISTER_COUNT - 1, |
| |
| .volatile_reg = wm8400_volatile, |
| |
| .cache_type = REGCACHE_RBTREE, |
| }; |
| |
| /** |
| * wm8400_reset_codec_reg_cache - Reset cached codec registers to |
| * their default values. |
| */ |
| void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) |
| { |
| regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config); |
| } |
| EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); |
| |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| static int wm8400_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *id) |
| { |
| struct wm8400 *wm8400; |
| int ret; |
| |
| wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL); |
| if (wm8400 == NULL) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config); |
| if (IS_ERR(wm8400->regmap)) { |
| ret = PTR_ERR(wm8400->regmap); |
| goto err; |
| } |
| |
| wm8400->dev = &i2c->dev; |
| i2c_set_clientdata(i2c, wm8400); |
| |
| ret = wm8400_init(wm8400, i2c->dev.platform_data); |
| if (ret != 0) |
| goto err; |
| |
| return 0; |
| |
| err: |
| return ret; |
| } |
| |
| static int wm8400_i2c_remove(struct i2c_client *i2c) |
| { |
| struct wm8400 *wm8400 = i2c_get_clientdata(i2c); |
| |
| wm8400_release(wm8400); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id wm8400_i2c_id[] = { |
| { "wm8400", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id); |
| |
| static struct i2c_driver wm8400_i2c_driver = { |
| .driver = { |
| .name = "WM8400", |
| .owner = THIS_MODULE, |
| }, |
| .probe = wm8400_i2c_probe, |
| .remove = wm8400_i2c_remove, |
| .id_table = wm8400_i2c_id, |
| }; |
| #endif |
| |
| static int __init wm8400_module_init(void) |
| { |
| int ret = -ENODEV; |
| |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| ret = i2c_add_driver(&wm8400_i2c_driver); |
| if (ret != 0) |
| pr_err("Failed to register I2C driver: %d\n", ret); |
| #endif |
| |
| return ret; |
| } |
| subsys_initcall(wm8400_module_init); |
| |
| static void __exit wm8400_module_exit(void) |
| { |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| i2c_del_driver(&wm8400_i2c_driver); |
| #endif |
| } |
| module_exit(wm8400_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |