Patchwork [v7,2/8] mfd: wm97xx-core: core support for wm97xx Codec

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Submitter Robert Jarzmik
Date Sept. 13, 2017, 7:37 p.m.
Message ID <20170913193723.16234-3-robert.jarzmik@free.fr>
Download mbox | patch
Permalink /patch/9951963/
State New
Headers show

Comments

Robert Jarzmik - Sept. 13, 2017, 7:37 p.m.
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: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
Since v3:
 - added a "depends on AC97_BUS_NEW" Kconfig statement
 - added default values for wm9705, wm9712 per Charles's comment
Since v4:
 - added Charles's ack
Since v5:
 - took into account Lee's comments
Since v6:
 - took into account Lee's comments
---
 drivers/mfd/Kconfig        |  14 ++
 drivers/mfd/Makefile       |   1 +
 drivers/mfd/wm97xx-core.c  | 366 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/wm97xx.h |  25 ++++
 4 files changed, 406 insertions(+)
 create mode 100644 drivers/mfd/wm97xx-core.c
 create mode 100644 include/linux/mfd/wm97xx.h
Lee Jones - Sept. 14, 2017, 7:41 a.m.
On Wed, 13 Sep 2017, Robert Jarzmik wrote:

> 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: Robert Jarzmik <robert.jarzmik@free.fr>
> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> Acked-by: Lee Jones <lee.jones@linaro.org>
> ---
> Since v3:
>  - added a "depends on AC97_BUS_NEW" Kconfig statement
>  - added default values for wm9705, wm9712 per Charles's comment
> Since v4:
>  - added Charles's ack
> Since v5:
>  - took into account Lee's comments
> Since v6:
>  - took into account Lee's comments
> ---
>  drivers/mfd/Kconfig        |  14 ++
>  drivers/mfd/Makefile       |   1 +
>  drivers/mfd/wm97xx-core.c  | 366 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/wm97xx.h |  25 ++++
>  4 files changed, 406 insertions(+)
>  create mode 100644 drivers/mfd/wm97xx-core.c
>  create mode 100644 include/linux/mfd/wm97xx.h

Applied, thanks.
Lee Jones - Sept. 14, 2017, 7:43 a.m.
On Thu, 14 Sep 2017, Lee Jones wrote:

> On Wed, 13 Sep 2017, Robert Jarzmik wrote:
> 
> > 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: Robert Jarzmik <robert.jarzmik@free.fr>
> > Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> > Acked-by: Lee Jones <lee.jones@linaro.org>
> > ---
> > Since v3:
> >  - added a "depends on AC97_BUS_NEW" Kconfig statement
> >  - added default values for wm9705, wm9712 per Charles's comment
> > Since v4:
> >  - added Charles's ack
> > Since v5:
> >  - took into account Lee's comments
> > Since v6:
> >  - took into account Lee's comments
> > ---
> >  drivers/mfd/Kconfig        |  14 ++
> >  drivers/mfd/Makefile       |   1 +
> >  drivers/mfd/wm97xx-core.c  | 366 +++++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/wm97xx.h |  25 ++++
> >  4 files changed, 406 insertions(+)
> >  create mode 100644 drivers/mfd/wm97xx-core.c
> >  create mode 100644 include/linux/mfd/wm97xx.h
> 
> Applied, thanks.

Change of plan.  It looks like there are deps.

Unapplied.
Mark Brown - Sept. 14, 2017, 4:04 p.m.
On Thu, Sep 14, 2017 at 08:43:00AM +0100, Lee Jones wrote:

> Change of plan.  It looks like there are deps.

> Unapplied.

The core stuff went in during the merge window, you should be able to
wait for -rc1 or pick up the asoc-v4.14 tag.
Lee Jones - Sept. 18, 2017, 8:52 a.m.
On Thu, 14 Sep 2017, Mark Brown wrote:

> On Thu, Sep 14, 2017 at 08:43:00AM +0100, Lee Jones wrote:
> 
> > Change of plan.  It looks like there are deps.
> 
> > Unapplied.
> 
> The core stuff went in during the merge window, you should be able to
> wait for -rc1 or pick up the asoc-v4.14 tag.

No, I mean patches; 3, 4, 5 and 7 depend on this file.
Mark Brown - Sept. 19, 2017, 12:15 p.m.
On Mon, Sep 18, 2017 at 09:52:36AM +0100, Lee Jones wrote:
> On Thu, 14 Sep 2017, Mark Brown wrote:

> > On Thu, Sep 14, 2017 at 08:43:00AM +0100, Lee Jones wrote:

> > > Change of plan.  It looks like there are deps.

> > > Unapplied.

> > The core stuff went in during the merge window, you should be able to
> > wait for -rc1 or pick up the asoc-v4.14 tag.

> No, I mean patches; 3, 4, 5 and 7 depend on this file.

Right, but I'd have expected a pull request more than the patch being
unapplied?
Lee Jones - Sept. 19, 2017, 3:22 p.m.
On Tue, 19 Sep 2017, Mark Brown wrote:

> On Mon, Sep 18, 2017 at 09:52:36AM +0100, Lee Jones wrote:
> > On Thu, 14 Sep 2017, Mark Brown wrote:
> 
> > > On Thu, Sep 14, 2017 at 08:43:00AM +0100, Lee Jones wrote:
> 
> > > > Change of plan.  It looks like there are deps.
> 
> > > > Unapplied.
> 
> > > The core stuff went in during the merge window, you should be able to
> > > wait for -rc1 or pick up the asoc-v4.14 tag.
> 
> > No, I mean patches; 3, 4, 5 and 7 depend on this file.
> 
> Right, but I'd have expected a pull request more than the patch being
> unapplied?

Normally I wait until all patches patches in the set have been
reviewed (the ASOC ones still have not), then ask the OP and the
other affected Maintainers how they want to deal with the patch.
Far more often than not, the the solution is just to take the set
through the MFD tree.

However, since this is a new driver, you can just take it with my:

Acked-by: Lee Jones <lee.jones@linaro.org>
Lee Jones - Sept. 19, 2017, 3:23 p.m.
On Tue, 19 Sep 2017, Lee Jones wrote:

> On Tue, 19 Sep 2017, Mark Brown wrote:
> 
> > On Mon, Sep 18, 2017 at 09:52:36AM +0100, Lee Jones wrote:
> > > On Thu, 14 Sep 2017, Mark Brown wrote:
> > 
> > > > On Thu, Sep 14, 2017 at 08:43:00AM +0100, Lee Jones wrote:
> > 
> > > > > Change of plan.  It looks like there are deps.
> > 
> > > > > Unapplied.
> > 
> > > > The core stuff went in during the merge window, you should be able to
> > > > wait for -rc1 or pick up the asoc-v4.14 tag.
> > 
> > > No, I mean patches; 3, 4, 5 and 7 depend on this file.
> > 
> > Right, but I'd have expected a pull request more than the patch being
> > unapplied?
> 
> Normally I wait until all patches patches in the set have been
> reviewed (the ASOC ones still have not), then ask the OP and the
> other affected Maintainers how they want to deal with the patch.
> Far more often than not, the the solution is just to take the set
> through the MFD tree.
> 
> However, since this is a new driver, you can just take it with my:
> 
> Acked-by: Lee Jones <lee.jones@linaro.org>

... although that does mean that you'll have to handle one of the
Input patches too.
Mark Brown - Sept. 19, 2017, 4:04 p.m.
On Tue, Sep 19, 2017 at 04:22:53PM +0100, Lee Jones wrote:

> Normally I wait until all patches patches in the set have been
> reviewed (the ASOC ones still have not), then ask the OP and the

I've been fine with them for ages.

> other affected Maintainers how they want to deal with the patch.
> Far more often than not, the the solution is just to take the set
> through the MFD tree.

It really helps if we can get the earlier parts of the series moving
even if the rest of it's in review still - I know I back off on
reviewing things if it looks like their dependencies aren't making
progress.
Lee Jones - Sept. 20, 2017, 8:24 a.m.
On Tue, 19 Sep 2017, Mark Brown wrote:

> On Tue, Sep 19, 2017 at 04:22:53PM +0100, Lee Jones wrote:
> 
> > Normally I wait until all patches patches in the set have been
> > reviewed (the ASOC ones still have not), then ask the OP and the
> 
> I've been fine with them for ages.
> 
> > other affected Maintainers how they want to deal with the patch.
> > Far more often than not, the the solution is just to take the set
> > through the MFD tree.
> 
> It really helps if we can get the earlier parts of the series moving
> even if the rest of it's in review still - I know I back off on
> reviewing things if it looks like their dependencies aren't making
> progress.

Just for your FYI, I tend to review my parts then wait for the
rest of the series to be reviewed, then discuss how the set should be
handled.

Holding back on reviewing your parts is not a good idea.  If everyone
did that we'd end up in a circular Maintainer dependency and nothing
would ever get reviewed.
Mark Brown - Sept. 20, 2017, 11:34 a.m.
On Wed, Sep 20, 2017 at 09:24:43AM +0100, Lee Jones wrote:
> On Tue, 19 Sep 2017, Mark Brown wrote:

> > It really helps if we can get the earlier parts of the series moving
> > even if the rest of it's in review still - I know I back off on
> > reviewing things if it looks like their dependencies aren't making
> > progress.

> Just for your FYI, I tend to review my parts then wait for the
> rest of the series to be reviewed, then discuss how the set should be
> handled.

> Holding back on reviewing your parts is not a good idea.  If everyone
> did that we'd end up in a circular Maintainer dependency and nothing
> would ever get reviewed.

I get fed up with having to re-review the same patches over and over and
over again while people work out what's going on with the earlier parts
of the series, that gets very time consuming and is error prone.  If
we're getting churn early on in the series that's causing things to
change then it's better to let that settle down and look properly at the
results than glaze over looking at each minor change as it comes in and
miss other things that get tweaked.  Once the dependencies are stable
then it becomes worthwhile again.

Patch

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 55ecdfb74d31..6d175698a49a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1628,6 +1628,20 @@  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)
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 31ce07611a6f..902c2e46f310 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -69,6 +69,7 @@  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
diff --git a/drivers/mfd/wm97xx-core.c b/drivers/mfd/wm97xx-core.c
new file mode 100644
index 000000000000..4141ee52a70b
--- /dev/null
+++ b/drivers/mfd/wm97xx-core.c
@@ -0,0 +1,366 @@ 
+/*
+ * 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");
+
diff --git a/include/linux/mfd/wm97xx.h b/include/linux/mfd/wm97xx.h
new file mode 100644
index 000000000000..45fb54f19d09
--- /dev/null
+++ b/include/linux/mfd/wm97xx.h
@@ -0,0 +1,25 @@ 
+/*
+ * 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