path: root/sound/soc/codecs/wm2000.c

/*
 * wm2000.c  --  WM2000 ALSA Soc Audio driver
 *
 * Copyright 2008-2010 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 version 2 as
 * published by the Free Software Foundation.
 *
 * The download image for the WM2000 will be requested as
 * 'wm2000_anc.bin' by default (overridable via platform data) at
 * runtime and is expected to be in flat binary format.  This is
 * generated by Wolfson configuration tools and includes
 * system-specific callibration information.  If supplied as a
 * sequence of ASCII-encoded hexidecimal bytes this can be converted
 * into a flat binary with a command such as this on the command line:
 *
 * perl -e 'while (<>) { s/[\r\n]+// ; printf("%c", hex($_)); }'
 *                 < file  > wm2000_anc.bin
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include <sound/wm2000.h>

#include "wm2000.h"

enum wm2000_anc_mode {
	ANC_ACTIVE = 0,
	ANC_BYPASS = 1,
	ANC_STANDBY = 2,
	ANC_OFF = 3,
};

struct wm2000_priv {
	struct i2c_client *i2c;

	enum wm2000_anc_mode anc_mode;

	unsigned int anc_active:1;
	unsigned int anc_eng_ena:1;
	unsigned int spk_ena:1;

	unsigned int mclk_div:1;
	unsigned int speech_clarity:1;

	int anc_download_size;
	char *anc_download;
};

static struct i2c_client *wm2000_i2c;

static int wm2000_write(struct i2c_client *i2c, unsigned int reg,
			unsigned int value)
{
	u8 data[3];
	int ret;

	data[0] = (reg >> 8) & 0xff;
	data[1] = reg & 0xff;
	data[2] = value & 0xff;

	dev_vdbg(&i2c->dev, "write %x = %x\n", reg, value);

	ret = i2c_master_send(i2c, data, 3);
	if (ret == 3)
		return 0;
	if (ret < 0)
		return ret;
	else
		return -EIO;
}

static unsigned int wm2000_read(struct i2c_client *i2c, unsigned int r)
{
	struct i2c_msg xfer[2];
	u8 reg[2];
	u8 data;
	int ret;

	/* Write register */
	reg[0] = (r >> 8) & 0xff;
	reg[1] = r & 0xff;
	xfer[0].addr = i2c->addr;
	xfer[0].flags = 0;
	xfer[0].len = sizeof(reg);
	xfer[0].buf = &reg[0];

	/* Read data */
	xfer[1].addr = i2c->addr;
	xfer[1].flags = I2C_M_RD;
	xfer[1].len = 1;
	xfer[1].buf = &data;

	ret = i2c_transfer(i2c->adapter, xfer, 2);
	if (ret != 2) {
		dev_err(&i2c->dev, "i2c_transfer() returned %d\n", ret);
		return 0;
	}

	dev_vdbg(&i2c->dev, "read %x from %x\n", data, r);

	return data;
}

static void wm2000_reset(struct wm2000_priv *wm2000)
{
	struct i2c_client *i2c = wm2000->i2c;

	wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
	wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
	wm2000_write(i2c, WM2000_REG_ID1, 0);

	wm2000->anc_mode = ANC_OFF;
}

static int wm2000_poll_bit(struct i2c_client *i2c,
			   unsigned int reg, u8 mask, int timeout)
{
	int val;

	val = wm2000_read(i2c, reg);

	while (!(val & mask) && --timeout) {
		msleep(1);
		val = wm2000_read(i2c, reg);
	}

	if (timeout == 0)
		return 0;
	else
		return 1;
}

static int wm2000_power_up(struct i2c_client *i2c, int analogue)
{
	struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
	int ret, timeout;

	BUG_ON(wm2000->anc_mode != ANC_OFF);

	dev_dbg(&i2c->dev, "Beginning power up\n");

	if (!wm2000->mclk_div) {
		dev_dbg(&i2c->dev, "Disabling MCLK divider\n");
		wm2000_write(i2c, WM2000_REG_SYS_CTL2,
			     WM2000_MCLK_DIV2_ENA_CLR);
	} else {
		dev_dbg(&i2c->dev, "Enabling MCLK divider\n");
		wm2000_write(i2c, WM2000_REG_SYS_CTL2,
			     WM2000_MCLK_DIV2_ENA_SET);
	}

	wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
	wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_SET);

	/* Wait for ANC engine