[PATCH 8/9] mfd: wm97xx-core: core support for wm97xx Codec

Robert Jarzmik
2016-10-26T20:12:19Z

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>
---
drivers/mfd/Kconfig | 14 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/wm97xx-core.c | 282 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/wm97xx.h | 31 +++++
4 files changed, 328 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 c6df6442ba2b..2ac818127b0a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1597,6 +1597,20 @@ 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 if 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 9834e669d985..5c3534f4c7c3 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..f2cd80354b4a
--- /dev/null
+++ b/drivers/mfd/wm97xx-core.c
@@ -0,0 +1,282 @@
+/*
+ * Wolfson WM97xx -- Core device
+ *
+ * Copyright (C) 2016 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/module.h>
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/wm97xx.h>
+#include <linux/wm97xx.h>
+#include <linux/regmap.h>
+#include <linux/slab.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;
+};
+
+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 wm97xx_reg_defaults[] = {
+};
+
+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 = wm97xx_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(wm97xx_reg_defaults),
+ .volatile_reg = regmap_ac97_default_volatile,
+ .readable_reg = wm97xx_readable_reg,
+ .writeable_reg = wm97xx_writeable_reg,
+};
+
+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 = wm97xx_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(wm97xx_reg_defaults),
+ .volatile_reg = regmap_ac97_default_volatile,
+ .readable_reg = wm97xx_readable_reg,
+ .writeable_reg = wm97xx_writeable_reg,
+};
+
+static int wm9705_register(struct wm97xx_priv *wm97xx)
+{
+ return 0;
+}
+
+static int wm9712_register(struct wm97xx_priv *wm97xx)
+{
+ return 0;
+}
+
+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 int wm9713_register(struct wm97xx_priv *wm97xx,
+ struct wm97xx_pdata *pdata)
+{
+ struct wm97xx_platform_data codec_pdata;
+ const struct mfd_cell cells[] = {
+ {
+ .name = "wm9713-codec",
+ .platform_data = &codec_pdata,
+ .pdata_size = sizeof(codec_pdata),
+ },
+ {
+ .name = "wm97xx-ts",
+ .platform_data = &codec_pdata,
+ .pdata_size = sizeof(codec_pdata),
+ },
+ };
+
+ codec_pdata.ac97 = wm97xx->ac97;
+ codec_pdata.regmap = devm_regmap_init_ac97(wm97xx->ac97,
+ &wm9713_regmap_config);
+ codec_pdata.batt_pdata = pdata->batt_pdata;
+ if (IS_ERR(codec_pdata.regmap))
+ return PTR_ERR(codec_pdata.regmap);
+
+ return devm_mfd_add_devices(wm97xx->dev, -1, cells,
+ ARRAY_SIZE(cells), NULL, 0, NULL);
+}
+
+static int wm97xx_ac97_probe(struct ac97_codec_device *adev)
+{
+ struct wm97xx_priv *wm97xx;
+ int ret;
+ void *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);
+
+ switch (adev->vendor_id) {
+ case WM9705_VENDOR_ID:
+ ret = wm9705_register(wm97xx);
+ break;
+ case WM9712_VENDOR_ID:
+ ret = wm9712_register(wm97xx);
+ break;
+ case WM9713_VENDOR_ID:
+ ret = wm9713_register(wm97xx, pdata);
+ break;
+ default:
+ ret = -ENODEV;
+ }
+
+ if (ret)
+ 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 wm97x3_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(&wm97x3_ac97_driver);
+}
+module_init(wm97xx_module_init);
+
+static void __exit wm97xx_module_exit(void)
+{
+ snd_ac97_codec_driver_unregister(&wm97x3_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..627322f14d48
--- /dev/null
+++ b/include/linux/mfd/wm97xx.h
@@ -0,0 +1,31 @@
+/*
+ * wm97xx client interface
+ *
+ * Copyright (C) 2016 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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
--
2.1.4