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authorRobert Jarzmik <robert.jarzmik@free.fr>2017-09-02 21:54:04 +0200
committerMark Brown <broonie@kernel.org>2017-09-04 18:24:56 +0100
commit74426fbff66eea8e8d1f42c8238c268d1e63a832 (patch)
tree98b6d36b8fc9f8059cbbb2114ce592dab5a94be7 /include/sound/ac97
parent8e4f7d9b8c652b4eb3ceb790e1e9fe433f9e3b58 (diff)
ALSA: ac97: add an ac97 bus
AC97 is a bus for sound usage. It enables for a AC97 AC-Link to link one controller to 0 to 4 AC97 codecs. The goal of this new implementation is to implement a device/driver model for AC97, with an automatic scan of the bus and automatic discovery of AC97 codec devices. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound/ac97')
-rw-r--r--include/sound/ac97/codec.h118
-rw-r--r--include/sound/ac97/compat.h20
-rw-r--r--include/sound/ac97/controller.h85
3 files changed, 223 insertions, 0 deletions
diff --git a/include/sound/ac97/codec.h b/include/sound/ac97/codec.h
new file mode 100644
index 000000000000..ec04be9ab119
--- /dev/null
+++ b/include/sound/ac97/codec.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * 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.
+ */
+#ifndef __SOUND_AC97_CODEC2_H
+#define __SOUND_AC97_CODEC2_H
+
+#include <linux/device.h>
+
+#define AC97_ID(vendor_id1, vendor_id2) \
+ ((((vendor_id1) & 0xffff) << 16) | ((vendor_id2) & 0xffff))
+#define AC97_DRIVER_ID(vendor_id1, vendor_id2, mask_id1, mask_id2, _data) \
+ { .id = (((vendor_id1) & 0xffff) << 16) | ((vendor_id2) & 0xffff), \
+ .mask = (((mask_id1) & 0xffff) << 16) | ((mask_id2) & 0xffff), \
+ .data = (_data) }
+
+struct ac97_controller;
+struct clk;
+
+/**
+ * struct ac97_id - matches a codec device and driver on an ac97 bus
+ * @id: The significant bits if the codec vendor ID1 and ID2
+ * @mask: Bitmask specifying which bits of the id field are significant when
+ * matching. A driver binds to a device when :
+ * ((vendorID1 << 8 | vendorID2) & (mask_id1 << 8 | mask_id2)) == id.
+ * @data: Private data used by the driver.
+ */
+struct ac97_id {
+ unsigned int id;
+ unsigned int mask;
+ void *data;
+};
+
+/**
+ * ac97_codec_device - a ac97 codec
+ * @dev: the core device
+ * @vendor_id: the vendor_id of the codec, as sensed on the AC-link
+ * @num: the codec number, 0 is primary, 1 is first slave, etc ...
+ * @clk: the clock BIT_CLK provided by the codec
+ * @ac97_ctrl: ac97 digital controller on the same AC-link
+ *
+ * This is the device instantiated for each codec living on a AC-link. There are
+ * normally 0 to 4 codec devices per AC-link, and all of them are controlled by
+ * an AC97 digital controller.
+ */
+struct ac97_codec_device {
+ struct device dev;
+ unsigned int vendor_id;
+ unsigned int num;
+ struct clk *clk;
+ struct ac97_controller *ac97_ctrl;
+};
+
+/**
+ * ac97_codec_driver - a ac97 codec driver
+ * @driver: the device driver structure
+ * @probe: the function called when a ac97_codec_device is matched
+ * @remove: the function called when the device is unbound/removed
+ * @shutdown: shutdown function (might be NULL)
+ * @id_table: ac97 vendor_id match table, { } member terminated
+ */
+struct ac97_codec_driver {
+ struct device_driver driver;
+ int (*probe)(struct ac97_codec_device *);
+ int (*remove)(struct ac97_codec_device *);
+ void (*shutdown)(struct ac97_codec_device *);
+ const struct ac97_id *id_table;
+};
+
+static inline struct ac97_codec_device *to_ac97_device(struct device *d)
+{
+ return container_of(d, struct ac97_codec_device, dev);
+}
+
+static inline struct ac97_codec_driver *to_ac97_driver(struct device_driver *d)
+{
+ return container_of(d, struct ac97_codec_driver, driver);
+}
+
+#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
+int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv);
+void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv);
+#else
+static inline int
+snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
+{
+ return 0;
+}
+static inline void
+snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
+{
+}
+#endif
+
+
+static inline struct device *
+ac97_codec_dev2dev(struct ac97_codec_device *adev)
+{
+ return &adev->dev;
+}
+
+static inline void *ac97_get_drvdata(struct ac97_codec_device *adev)
+{
+ return dev_get_drvdata(ac97_codec_dev2dev(adev));
+}
+
+static inline void ac97_set_drvdata(struct ac97_codec_device *adev,
+ void *data)
+{
+ dev_set_drvdata(ac97_codec_dev2dev(adev), data);
+}
+
+void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev);
+
+#endif
diff --git a/include/sound/ac97/compat.h b/include/sound/ac97/compat.h
new file mode 100644
index 000000000000..1351cba40048
--- /dev/null
+++ b/include/sound/ac97/compat.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * 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.
+ *
+ * This file is for backward compatibility with snd_ac97 structure and its
+ * multiple usages, such as the snd_ac97_bus and snd_ac97_build_ops.
+ *
+ */
+#ifndef AC97_COMPAT_H
+#define AC97_COMPAT_H
+
+#include <sound/ac97_codec.h>
+
+struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev);
+void snd_ac97_compat_release(struct snd_ac97 *ac97);
+
+#endif
diff --git a/include/sound/ac97/controller.h b/include/sound/ac97/controller.h
new file mode 100644
index 000000000000..b36ecdd64f14
--- /dev/null
+++ b/include/sound/ac97/controller.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * 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.
+ */
+#ifndef AC97_CONTROLLER_H
+#define AC97_CONTROLLER_H
+
+#include <linux/device.h>
+#include <linux/list.h>
+
+#define AC97_BUS_MAX_CODECS 4
+#define AC97_SLOTS_AVAILABLE_ALL 0xf
+
+struct ac97_controller_ops;
+
+/**
+ * struct ac97_controller - The AC97 controller of the AC-Link
+ * @ops: the AC97 operations.
+ * @controllers: linked list of all existing controllers.
+ * @adap: the shell device ac97-%d, ie. ac97 adapter
+ * @nr: the number of the shell device
+ * @slots_available: the mask of accessible/scanable codecs.
+ * @parent: the device providing the AC97 controller.
+ * @codecs: the 4 possible AC97 codecs (NULL if none found).
+ * @codecs_pdata: platform_data for each codec (NULL if no pdata).
+ *
+ * This structure is internal to AC97 bus, and should not be used by the
+ * controllers themselves, excepting for using @dev.
+ */
+struct ac97_controller {
+ const struct ac97_controller_ops *ops;
+ struct list_head controllers;
+ struct device adap;
+ int nr;
+ unsigned short slots_available;
+ struct device *parent;
+ struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS];
+ void *codecs_pdata[AC97_BUS_MAX_CODECS];
+};
+
+/**
+ * struct ac97_controller_ops - The AC97 operations
+ * @reset: Cold reset of the AC97 AC-Link.
+ * @warm_reset: Warm reset of the AC97 AC-Link.
+ * @read: Read of a single AC97 register.
+ * Returns the register value or a negative error code.
+ * @write: Write of a single AC97 register.
+ *
+ * These are the basic operation an AC97 controller must provide for an AC97
+ * access functions. Amongst these, all but the last 2 are mandatory.
+ * The slot number is also known as the AC97 codec number, between 0 and 3.
+ */
+struct ac97_controller_ops {
+ void (*reset)(struct ac97_controller *adrv);
+ void (*warm_reset)(struct ac97_controller *adrv);
+ int (*write)(struct ac97_controller *adrv, int slot,
+ unsigned short reg, unsigned short val);
+ int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg);
+};
+
+#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
+struct ac97_controller *snd_ac97_controller_register(
+ const struct ac97_controller_ops *ops, struct device *dev,
+ unsigned short slots_available, void **codecs_pdata);
+void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);
+#else
+static inline struct ac97_controller *
+snd_ac97_controller_register(const struct ac97_controller_ops *ops,
+ struct device *dev,
+ unsigned short slots_available,
+ void **codecs_pdata)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void
+snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
+{
+}
+#endif
+
+#endif