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Commit a5c6951c authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Mark Brown
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mfd: wm97xx-core: core support for wm97xx Codec 



The WM9705, WM9712 and WM9713 are highly integrated codecs, with an
audio codec, DAC and ADC, GPIO unit and a touchscreen interface.

Historically the support was spread across drivers/input/touchscreen and
sound/soc/codecs. The sharing was done through ac97 bus sharing. This
model will not withstand the new AC97 bus model, where codecs are
discovered on runtime.

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Acked-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent c72f61e7

drivers/mfd/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -1746,6 +1746,20 @@ config MFD_WM8994 
	  core support for the WM8994, in order to use the actual

	  functionaltiy of the device other drivers must be enabled.



config MFD_WM97xx

	tristate "Wolfson Microelectronics WM97xx"

	select MFD_CORE

	select REGMAP_AC97

	select AC97_BUS_COMPAT

	depends on AC97_BUS_NEW

	help

	  The WM9705, WM9712 and WM9713 is a highly integrated hi-fi CODEC

	  designed for smartphone applications.  As well as audio functionality

	  it has on board GPIO and a touchscreen functionality which is

	  supported via the relevant subsystems.  This driver provides core

	  support for the WM97xx, in order to use the actual functionaltiy of

	  the device other drivers must be enabled.



config MFD_STW481X

	tristate "Support for ST Microelectronics STw481x"

	depends on I2C && (ARCH_NOMADIK || COMPILE_TEST)

drivers/mfd/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ obj-$(CONFIG_MFD_WM8350) += wm8350.o 
obj-$(CONFIG_MFD_WM8350_I2C)	+= wm8350-i2c.o

wm8994-objs			:= wm8994-core.o wm8994-irq.o wm8994-regmap.o

obj-$(CONFIG_MFD_WM8994)	+= wm8994.o

obj-$(CONFIG_MFD_WM97xx)	+= wm97xx-core.o



obj-$(CONFIG_TPS6105X)		+= tps6105x.o

obj-$(CONFIG_TPS65010)		+= tps65010.o

drivers/mfd/wm97xx-core.c

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+366 −0
Original line number Diff line number Diff line 
/*

 * Wolfson WM97xx -- Core device

 *

 * Copyright (C) 2017 Robert Jarzmik

 *

 * 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.

 *

 * Features:

 *  - an AC97 audio codec

 *  - a touchscreen driver

 *  - a GPIO block

 */



#include <linux/device.h>

#include <linux/mfd/core.h>

#include <linux/mfd/wm97xx.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/wm97xx.h>

#include <sound/ac97/codec.h>

#include <sound/ac97/compat.h>



#define WM9705_VENDOR_ID 0x574d4c05

#define WM9712_VENDOR_ID 0x574d4c12

#define WM9713_VENDOR_ID 0x574d4c13

#define WM97xx_VENDOR_ID_MASK 0xffffffff



struct wm97xx_priv {

	struct regmap *regmap;

	struct snd_ac97 *ac97;

	struct device *dev;

	struct wm97xx_platform_data codec_pdata;

};



static bool wm97xx_readable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AC97_RESET ... AC97_PCM_SURR_DAC_RATE:

	case AC97_PCM_LR_ADC_RATE:

	case AC97_CENTER_LFE_MASTER:

	case AC97_SPDIF ... AC97_LINE1_LEVEL:

	case AC97_GPIO_CFG ... 0x5c:

	case AC97_CODEC_CLASS_REV ... AC97_PCI_SID:

	case 0x74 ... AC97_VENDOR_ID2:

		return true;

	default:

		return false;

	}

}



static bool wm97xx_writeable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AC97_VENDOR_ID1:

	case AC97_VENDOR_ID2:

		return false;

	default:

		return wm97xx_readable_reg(dev, reg);

	}

}



static const struct reg_default wm9705_reg_defaults[] = {

	{ 0x02, 0x8000 },

	{ 0x04, 0x8000 },

	{ 0x06, 0x8000 },

	{ 0x0a, 0x8000 },

	{ 0x0c, 0x8008 },

	{ 0x0e, 0x8008 },

	{ 0x10, 0x8808 },

	{ 0x12, 0x8808 },

	{ 0x14, 0x8808 },

	{ 0x16, 0x8808 },

	{ 0x18, 0x8808 },

	{ 0x1a, 0x0000 },

	{ 0x1c, 0x8000 },

	{ 0x20, 0x0000 },

	{ 0x22, 0x0000 },

	{ 0x26, 0x000f },

	{ 0x28, 0x0605 },

	{ 0x2a, 0x0000 },

	{ 0x2c, 0xbb80 },

	{ 0x32, 0xbb80 },

	{ 0x34, 0x2000 },

	{ 0x5a, 0x0000 },

	{ 0x5c, 0x0000 },

	{ 0x72, 0x0808 },

	{ 0x74, 0x0000 },

	{ 0x76, 0x0006 },

	{ 0x78, 0x0000 },

	{ 0x7a, 0x0000 },

};



static const struct regmap_config wm9705_regmap_config = {

	.reg_bits = 16,

	.reg_stride = 2,

	.val_bits = 16,

	.max_register = 0x7e,

	.cache_type = REGCACHE_RBTREE,



	.reg_defaults = wm9705_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(wm9705_reg_defaults),

	.volatile_reg = regmap_ac97_default_volatile,

	.readable_reg = wm97xx_readable_reg,

	.writeable_reg = wm97xx_writeable_reg,

};



static struct mfd_cell wm9705_cells[] = {

	{ .name = "wm9705-codec", },

	{ .name = "wm97xx-ts", },

};



static bool wm9712_volatile_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AC97_REC_GAIN:

		return true;

	default:

		return regmap_ac97_default_volatile(dev, reg);

	}

}



static const struct reg_default wm9712_reg_defaults[] = {

	{ 0x02, 0x8000 },

	{ 0x04, 0x8000 },

	{ 0x06, 0x8000 },

	{ 0x08, 0x0f0f },

	{ 0x0a, 0xaaa0 },

	{ 0x0c, 0xc008 },

	{ 0x0e, 0x6808 },

	{ 0x10, 0xe808 },

	{ 0x12, 0xaaa0 },

	{ 0x14, 0xad00 },

	{ 0x16, 0x8000 },

	{ 0x18, 0xe808 },

	{ 0x1a, 0x3000 },

	{ 0x1c, 0x8000 },

	{ 0x20, 0x0000 },

	{ 0x22, 0x0000 },

	{ 0x26, 0x000f },

	{ 0x28, 0x0605 },

	{ 0x2a, 0x0410 },

	{ 0x2c, 0xbb80 },

	{ 0x2e, 0xbb80 },

	{ 0x32, 0xbb80 },

	{ 0x34, 0x2000 },

	{ 0x4c, 0xf83e },

	{ 0x4e, 0xffff },

	{ 0x50, 0x0000 },

	{ 0x52, 0x0000 },

	{ 0x56, 0xf83e },

	{ 0x58, 0x0008 },

	{ 0x5c, 0x0000 },

	{ 0x60, 0xb032 },

	{ 0x62, 0x3e00 },

	{ 0x64, 0x0000 },

	{ 0x76, 0x0006 },

	{ 0x78, 0x0001 },

	{ 0x7a, 0x0000 },

};



static const struct regmap_config wm9712_regmap_config = {

	.reg_bits = 16,

	.reg_stride = 2,

	.val_bits = 16,

	.max_register = 0x7e,

	.cache_type = REGCACHE_RBTREE,



	.reg_defaults = wm9712_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(wm9712_reg_defaults),

	.volatile_reg = wm9712_volatile_reg,

	.readable_reg = wm97xx_readable_reg,

	.writeable_reg = wm97xx_writeable_reg,

};



static struct mfd_cell wm9712_cells[] = {

	{ .name = "wm9712-codec", },

	{ .name = "wm97xx-ts", },

};



static const struct reg_default wm9713_reg_defaults[] = {

	{ 0x02, 0x8080 },	/* Speaker Output Volume */

	{ 0x04, 0x8080 },	/* Headphone Output Volume */

	{ 0x06, 0x8080 },	/* Out3/OUT4 Volume */

	{ 0x08, 0xc880 },	/* Mono Volume */

	{ 0x0a, 0xe808 },	/* LINEIN Volume */

	{ 0x0c, 0xe808 },	/* DAC PGA Volume */

	{ 0x0e, 0x0808 },	/* MIC PGA Volume */

	{ 0x10, 0x00da },	/* MIC Routing Control */

	{ 0x12, 0x8000 },	/* Record PGA Volume */

	{ 0x14, 0xd600 },	/* Record Routing */

	{ 0x16, 0xaaa0 },	/* PCBEEP Volume */

	{ 0x18, 0xaaa0 },	/* VxDAC Volume */

	{ 0x1a, 0xaaa0 },	/* AUXDAC Volume */

	{ 0x1c, 0x0000 },	/* Output PGA Mux */

	{ 0x1e, 0x0000 },	/* DAC 3D control */

	{ 0x20, 0x0f0f },	/* DAC Tone Control*/

	{ 0x22, 0x0040 },	/* MIC Input Select & Bias */

	{ 0x24, 0x0000 },	/* Output Volume Mapping & Jack */

	{ 0x26, 0x7f00 },	/* Powerdown Ctrl/Stat*/

	{ 0x28, 0x0405 },	/* Extended Audio ID */

	{ 0x2a, 0x0410 },	/* Extended Audio Start/Ctrl */

	{ 0x2c, 0xbb80 },	/* Audio DACs Sample Rate */

	{ 0x2e, 0xbb80 },	/* AUXDAC Sample Rate */

	{ 0x32, 0xbb80 },	/* Audio ADCs Sample Rate */

	{ 0x36, 0x4523 },	/* PCM codec control */

	{ 0x3a, 0x2000 },	/* SPDIF control */

	{ 0x3c, 0xfdff },	/* Powerdown 1 */

	{ 0x3e, 0xffff },	/* Powerdown 2 */

	{ 0x40, 0x0000 },	/* General Purpose */

	{ 0x42, 0x0000 },	/* Fast Power-Up Control */

	{ 0x44, 0x0080 },	/* MCLK/PLL Control */

	{ 0x46, 0x0000 },	/* MCLK/PLL Control */



	{ 0x4c, 0xfffe },	/* GPIO Pin Configuration */

	{ 0x4e, 0xffff },	/* GPIO Pin Polarity / Type */

	{ 0x50, 0x0000 },	/* GPIO Pin Sticky */

	{ 0x52, 0x0000 },	/* GPIO Pin Wake-Up */

				/* GPIO Pin Status */

	{ 0x56, 0xfffe },	/* GPIO Pin Sharing */

	{ 0x58, 0x4000 },	/* GPIO PullUp/PullDown */

	{ 0x5a, 0x0000 },	/* Additional Functions 1 */

	{ 0x5c, 0x0000 },	/* Additional Functions 2 */

	{ 0x60, 0xb032 },	/* ALC Control */

	{ 0x62, 0x3e00 },	/* ALC / Noise Gate Control */

	{ 0x64, 0x0000 },	/* AUXDAC input control */

	{ 0x74, 0x0000 },	/* Digitiser Reg 1 */

	{ 0x76, 0x0006 },	/* Digitiser Reg 2 */

	{ 0x78, 0x0001 },	/* Digitiser Reg 3 */

	{ 0x7a, 0x0000 },	/* Digitiser Read Back */

};



static const struct regmap_config wm9713_regmap_config = {

	.reg_bits = 16,

	.reg_stride = 2,

	.val_bits = 16,

	.max_register = 0x7e,

	.cache_type = REGCACHE_RBTREE,



	.reg_defaults = wm9713_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(wm9713_reg_defaults),

	.volatile_reg = regmap_ac97_default_volatile,

	.readable_reg = wm97xx_readable_reg,

	.writeable_reg = wm97xx_writeable_reg,

};



static struct mfd_cell wm9713_cells[] = {

	{ .name = "wm9713-codec", },

	{ .name = "wm97xx-ts", },

};



static int wm97xx_ac97_probe(struct ac97_codec_device *adev)

{

	struct wm97xx_priv *wm97xx;

	const struct regmap_config *config;

	struct wm97xx_platform_data *codec_pdata;

	struct mfd_cell *cells;

	int ret = -ENODEV, nb_cells, i;

	struct wm97xx_pdata *pdata = snd_ac97_codec_get_platdata(adev);



	wm97xx = devm_kzalloc(ac97_codec_dev2dev(adev),

			      sizeof(*wm97xx), GFP_KERNEL);

	if (!wm97xx)

		return -ENOMEM;



	wm97xx->dev = ac97_codec_dev2dev(adev);

	wm97xx->ac97 = snd_ac97_compat_alloc(adev);

	if (IS_ERR(wm97xx->ac97))

		return PTR_ERR(wm97xx->ac97);





	ac97_set_drvdata(adev, wm97xx);

	dev_info(wm97xx->dev, "wm97xx core found, id=0x%x\n",

		 adev->vendor_id);



	codec_pdata = &wm97xx->codec_pdata;

	codec_pdata->ac97 = wm97xx->ac97;

	codec_pdata->batt_pdata = pdata->batt_pdata;



	switch (adev->vendor_id) {

	case WM9705_VENDOR_ID:

		config = &wm9705_regmap_config;

		cells = wm9705_cells;

		nb_cells = ARRAY_SIZE(wm9705_cells);

		break;

	case WM9712_VENDOR_ID:

		config = &wm9712_regmap_config;

		cells = wm9712_cells;

		nb_cells = ARRAY_SIZE(wm9712_cells);

		break;

	case WM9713_VENDOR_ID:

		config = &wm9713_regmap_config;

		cells = wm9713_cells;

		nb_cells = ARRAY_SIZE(wm9713_cells);

		break;

	default:

		goto err_free_compat;

	}



	for (i = 0; i < nb_cells; i++) {

		cells[i].platform_data = codec_pdata;

		cells[i].pdata_size = sizeof(*codec_pdata);

	}



	codec_pdata->regmap = devm_regmap_init_ac97(wm97xx->ac97, config);

	if (IS_ERR(codec_pdata->regmap)) {

		ret = PTR_ERR(codec_pdata->regmap);

		goto err_free_compat;

	}



	ret = devm_mfd_add_devices(wm97xx->dev, PLATFORM_DEVID_NONE,

				   cells, nb_cells, NULL, 0, NULL);

	if (ret)

		goto err_free_compat;



	return ret;



err_free_compat:

	snd_ac97_compat_release(wm97xx->ac97);

	return ret;

}



static int wm97xx_ac97_remove(struct ac97_codec_device *adev)

{

	struct wm97xx_priv *wm97xx = ac97_get_drvdata(adev);



	snd_ac97_compat_release(wm97xx->ac97);



	return 0;

}



static const struct ac97_id wm97xx_ac97_ids[] = {

	{ .id = WM9705_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },

	{ .id = WM9712_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },

	{ .id = WM9713_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },

	{ }

};



static struct ac97_codec_driver wm97xx_ac97_driver = {

	.driver = {

		.name = "wm97xx-core",

	},

	.probe		= wm97xx_ac97_probe,

	.remove		= wm97xx_ac97_remove,

	.id_table	= wm97xx_ac97_ids,

};



static int __init wm97xx_module_init(void)

{

	return snd_ac97_codec_driver_register(&wm97xx_ac97_driver);

}

module_init(wm97xx_module_init);



static void __exit wm97xx_module_exit(void)

{

	snd_ac97_codec_driver_unregister(&wm97xx_ac97_driver);

}

module_exit(wm97xx_module_exit);



MODULE_DESCRIPTION("WM9712, WM9713 core driver");

MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");

MODULE_LICENSE("GPL");

include/linux/mfd/wm97xx.h

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Original line number Diff line number Diff line 
/*

 * wm97xx client interface

 *

 * Copyright (C) 2017 Robert Jarzmik

 *

 * 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.

 */



#ifndef __LINUX_MFD_WM97XX_H

#define __LINUX_MFD_WM97XX_H



struct regmap;

struct wm97xx_batt_pdata;

struct snd_ac97;



struct wm97xx_platform_data {

	struct snd_ac97 *ac97;

	struct regmap *regmap;

	struct wm97xx_batt_pdata *batt_pdata;

};



#endif