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Commit 741a509f authored by Markus Pargmann's avatar Markus Pargmann Committed by Mark Brown
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ASoC: core: Generic ac97 link reset functions 



This patch adds generic ac97 reset functions using pincontrol and gpio
parsed from devicetree.

Signed-off-by: default avatarMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent d2a369cb

Documentation/devicetree/bindings/sound/soc-ac97link.txt

0 → 100644
+28 −0
Original line number Diff line number Diff line 
AC97 link bindings



These bindings can be included within any other device node.



Required properties:

 - pinctrl-names: Has to contain following states to setup the correct

   pinmuxing for the used gpios:

	"ac97-running": AC97-link is active

	"ac97-reset": AC97-link reset state

	"ac97-warm-reset": AC97-link warm reset state

 - ac97-gpios: List of gpio phandles with args in the order ac97-sync,

   ac97-sdata, ac97-reset





Example:



ssi {

	...



	pinctrl-names = "default", "ac97-running", "ac97-reset", "ac97-warm-reset";

	pinctrl-0 = <&ac97link_running>;

	pinctrl-1 = <&ac97link_running>;

	pinctrl-2 = <&ac97link_reset>;

	pinctrl-3 = <&ac97link_warm_reset>;

	ac97-gpios = <&gpio3 20 0 &gpio3 22 0 &gpio3 28 0>;



	...

};

include/sound/soc.h

+2 −0
Original line number Diff line number Diff line
@@ -468,6 +468,8 @@ int snd_soc_new_ac97_codec(struct snd_soc_codec *codec, 
void snd_soc_free_ac97_codec(struct snd_soc_codec *codec);



int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);

int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,

		struct platform_device *pdev);



/*

 *Controls

sound/soc/soc-core.c

+153 −0
Original line number Diff line number Diff line
@@ -30,9 +30,12 @@ 
#include <linux/bitops.h>

#include <linux/debugfs.h>

#include <linux/platform_device.h>

#include <linux/pinctrl/consumer.h>

#include <linux/ctype.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/gpio.h>

#include <linux/of_gpio.h>

#include <sound/ac97_codec.h>

#include <sound/core.h>

#include <sound/jack.h>
@@ -69,6 +72,16 @@ static int pmdown_time = 5000; 
module_param(pmdown_time, int, 0);

MODULE_PARM_DESC(pmdown_time, "DAPM stream powerdown time (msecs)");



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;

};



/* returns the minimum number of bytes needed to represent

 * a particular given value */

static int min_bytes_needed(unsigned long val)
@@ -2080,6 +2093,117 @@ int snd_soc_new_ac97_codec(struct snd_soc_codec *codec, 
}

EXPORT_SYMBOL_GPL(snd_soc_new_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_RET(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_RET(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_RET(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_RET(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);
@@ -2097,6 +2221,35 @@ int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) 
}

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);



/**

 * snd_soc_free_ac97_codec - free AC97 codec device

 * @codec: audio codec