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    Subject[PATCH v7 2/8] mfd: wm97xx-core: core support for wm97xx Codec
    Date
    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

    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
    --
    2.11.0
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