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authorLars-Peter Clausen <lars@metafoo.de>2014-11-10 22:41:46 +0100
committerMark Brown <broonie@kernel.org>2014-11-18 15:26:06 +0000
commit336b8423e285174ebecf02a743d69913b83bbc48 (patch)
tree68df16c040d0624e6e6c7979e0d9de8db51bafee /sound/soc/soc-ac97.c
parent70f3af3ca15affaef3d026a5aa6e44c4627ea6c7 (diff)
downloadlinux-336b8423e285174ebecf02a743d69913b83bbc48.tar.gz
ASoC: Move AC'97 support to its own file
Currently the AC'97 support is splattered all throughout soc-core.c. Some parts are #ifdef'd some parts are not. This patch moves the AC'97 support to its own file, this should make the code a bit more clearer and also makes it possible to easily not compile it into the kernel when not needed. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/soc-ac97.c')
-rw-r--r--sound/soc/soc-ac97.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/sound/soc/soc-ac97.c b/sound/soc/soc-ac97.c
new file mode 100644
index 000000000000..da7b031a6eea
--- /dev/null
+++ b/sound/soc/soc-ac97.c
@@ -0,0 +1,382 @@
+/*
+ * soc-ac97.c -- ALSA SoC Audio Layer AC97 support
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Copyright 2005 Openedhand Ltd.
+ * Copyright (C) 2010 Slimlogic Ltd.
+ * Copyright (C) 2010 Texas Instruments Inc.
+ *
+ * Author: Liam Girdwood <lrg@slimlogic.co.uk>
+ * with code, comments and ideas from :-
+ * Richard Purdie <richard@openedhand.com>
+ *
+ * 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.
+ */
+
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/of_gpio.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/slab.h>
+#include <sound/ac97_codec.h>
+#include <sound/soc.h>
+
+struct snd_ac97_reset_cfg {
+ struct pinctrl *pctl;
+ struct pinctrl_state *pstate_reset;
+ struct pinctrl_state *pstate_warm_reset;
+ struct pinctrl_state *pstate_run;
+ int gpio_sdata;
+ int gpio_sync;
+ int gpio_reset;
+};
+
+/* unregister ac97 codec */
+static int soc_ac97_dev_unregister(struct snd_soc_codec *codec)
+{
+ if (codec->ac97->dev.bus)
+ device_del(&codec->ac97->dev);
+ return 0;
+}
+
+/* register ac97 codec to bus */
+static int soc_ac97_dev_register(struct snd_soc_codec *codec)
+{
+ int err;
+
+ codec->ac97->dev.bus = &ac97_bus_type;
+ codec->ac97->dev.parent = codec->component.card->dev;
+
+ dev_set_name(&codec->ac97->dev, "%d-%d:%s",
+ codec->component.card->snd_card->number, 0,
+ codec->component.name);
+ err = device_add(&codec->ac97->dev);
+ if (err < 0) {
+ dev_err(codec->dev, "ASoC: Can't register ac97 bus\n");
+ codec->ac97->dev.bus = NULL;
+ return err;
+ }
+ return 0;
+}
+
+static int soc_register_ac97_codec(struct snd_soc_codec *codec,
+ struct snd_soc_dai *codec_dai)
+{
+ int ret;
+
+ /* Only instantiate AC97 if not already done by the adaptor
+ * for the generic AC97 subsystem.
+ */
+ if (codec_dai->driver->ac97_control && !codec->ac97_registered) {
+ /*
+ * It is possible that the AC97 device is already registered to
+ * the device subsystem. This happens when the device is created
+ * via snd_ac97_mixer(). Currently only SoC codec that does so
+ * is the generic AC97 glue but others migh emerge.
+ *
+ * In those cases we don't try to register the device again.
+ */
+ if (!codec->ac97_created)
+ return 0;
+
+ ret = soc_ac97_dev_register(codec);
+ if (ret < 0) {
+ dev_err(codec->dev,
+ "ASoC: AC97 device register failed: %d\n", ret);
+ return ret;
+ }
+
+ codec->ac97_registered = 1;
+ }
+ return 0;
+}
+
+static void soc_unregister_ac97_codec(struct snd_soc_codec *codec)
+{
+ if (codec->ac97_registered) {
+ soc_ac97_dev_unregister(codec);
+ codec->ac97_registered = 0;
+ }
+}
+
+static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
+{
+ int i, ret;
+
+ for (i = 0; i < rtd->num_codecs; i++) {
+ struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
+
+ ret = soc_register_ac97_codec(codec_dai->codec, codec_dai);
+ if (ret) {
+ while (--i >= 0)
+ soc_unregister_ac97_codec(codec_dai->codec);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void soc_unregister_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
+{
+ int i;
+
+ for (i = 0; i < rtd->num_codecs; i++)
+ soc_unregister_ac97_codec(rtd->codec_dais[i]->codec);
+}
+
+static void soc_ac97_device_release(struct device *dev)
+{
+ kfree(to_ac97_t(dev));
+}
+
+/**
+ * snd_soc_new_ac97_codec - initailise AC97 device
+ * @codec: audio codec
+ * @ops: AC97 bus operations
+ * @num: AC97 codec number
+ *
+ * Initialises AC97 codec resources for use by ad-hoc devices only.
+ */
+int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
+ struct snd_ac97_bus_ops *ops, int num)
+{
+ codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
+ if (codec->ac97 == NULL)
+ return -ENOMEM;
+
+ codec->ac97->bus = kzalloc(sizeof(struct snd_ac97_bus), GFP_KERNEL);
+ if (codec->ac97->bus == NULL) {
+ kfree(codec->ac97);
+ codec->ac97 = NULL;
+ return -ENOMEM;
+ }
+
+ codec->ac97->bus->ops = ops;
+ codec->ac97->num = num;
+ codec->ac97->dev.release = soc_ac97_device_release;
+
+ /*
+ * Mark the AC97 device to be created by us. This way we ensure that the
+ * device will be registered with the device subsystem later on.
+ */
+ codec->ac97_created = 1;
+ device_initialize(&codec->ac97->dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);
+
+/**
+ * snd_soc_free_ac97_codec - free AC97 codec device
+ * @codec: audio codec
+ *
+ * Frees AC97 codec device resources.
+ */
+void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
+{
+ soc_unregister_ac97_codec(codec);
+ kfree(codec->ac97->bus);
+ codec->ac97->bus = NULL;
+ put_device(&codec->ac97->dev);
+ codec->ac97 = NULL;
+ codec->ac97_created = 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);
+
+static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
+
+static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+ struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
+
+ pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);
+
+ udelay(10);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
+
+ pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
+ msleep(2);
+}
+
+static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
+{
+ struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
+
+ pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);
+
+ udelay(10);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1);
+
+ pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
+ msleep(2);
+}
+
+static int snd_soc_ac97_parse_pinctl(struct device *dev,
+ struct snd_ac97_reset_cfg *cfg)
+{
+ struct pinctrl *p;
+ struct pinctrl_state *state;
+ int gpio;
+ int ret;
+
+ p = devm_pinctrl_get(dev);
+ if (IS_ERR(p)) {
+ dev_err(dev, "Failed to get pinctrl\n");
+ return PTR_ERR(p);
+ }
+ cfg->pctl = p;
+
+ state = pinctrl_lookup_state(p, "ac97-reset");
+ if (IS_ERR(state)) {
+ dev_err(dev, "Can't find pinctrl state ac97-reset\n");
+ return PTR_ERR(state);
+ }
+ cfg->pstate_reset = state;
+
+ state = pinctrl_lookup_state(p, "ac97-warm-reset");
+ if (IS_ERR(state)) {
+ dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
+ return PTR_ERR(state);
+ }
+ cfg->pstate_warm_reset = state;
+
+ state = pinctrl_lookup_state(p, "ac97-running");
+ if (IS_ERR(state)) {
+ dev_err(dev, "Can't find pinctrl state ac97-running\n");
+ return PTR_ERR(state);
+ }
+ cfg->pstate_run = state;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-sync gpio\n");
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link sync");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-sync gpio\n");
+ return ret;
+ }
+ cfg->gpio_sync = gpio;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-sdata gpio\n");
+ return ret;
+ }
+ cfg->gpio_sdata = gpio;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-reset gpio\n");
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link reset");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-reset gpio\n");
+ return ret;
+ }
+ cfg->gpio_reset = gpio;
+
+ return 0;
+}
+
+struct snd_ac97_bus_ops *soc_ac97_ops;
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
+{
+ if (ops == soc_ac97_ops)
+ return 0;
+
+ if (soc_ac97_ops && ops)
+ return -EBUSY;
+
+ soc_ac97_ops = ops;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
+
+/**
+ * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
+ *
+ * This function sets the reset and warm_reset properties of ops and parses
+ * the device node of pdev to get pinctrl states and gpio numbers to use.
+ */
+int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct snd_ac97_reset_cfg cfg;
+ int ret;
+
+ ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
+ if (ret)
+ return ret;
+
+ ret = snd_soc_set_ac97_ops(ops);
+ if (ret)
+ return ret;
+
+ ops->warm_reset = snd_soc_ac97_warm_reset;
+ ops->reset = snd_soc_ac97_reset;
+
+ snd_ac97_rst_cfg = cfg;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);
+
+int snd_soc_ac97_register_dai_links(struct snd_soc_card *card)
+{
+ int i;
+ int ret;
+
+ /* register any AC97 codecs */
+ for (i = 0; i < card->num_rtd; i++) {
+ ret = soc_register_ac97_dai_link(&card->rtd[i]);
+ if (ret < 0)
+ goto err;
+ }
+
+ return 0;
+err:
+ dev_err(card->dev,
+ "ASoC: failed to register AC97: %d\n", ret);
+ while (--i >= 0)
+ soc_unregister_ac97_dai_link(&card->rtd[i]);
+ return ret;
+}
+
+void snd_soc_ac97_add_pdata(struct snd_soc_pcm_runtime *rtd)
+{
+ unsigned int i;
+
+ /* add platform data for AC97 devices */
+ for (i = 0; i < rtd->num_codecs; i++) {
+ if (rtd->codec_dais[i]->driver->ac97_control)
+ snd_ac97_dev_add_pdata(rtd->codec_dais[i]->codec->ac97,
+ rtd->cpu_dai->ac97_pdata);
+ }
+}