Re: [PATCH 18/48] ARM: pxa: hx4700: use gpio descriptors for audio

[Arnd Bergmann <arnd@kernel.org>]

On Thu, May 5, 2022 at 5:04 PM Mark Brown <broonie@kernel.org> wrote:
> On Thu, May 05, 2022 at 04:59:35PM +0200, Arnd Bergmann wrote:
> > On Thu, May 5, 2022 at 4:39 PM Mark Brown <broonie@kernel.org> wrote:
> > > On Thu, May 05, 2022 at 04:33:06PM +0200, Linus Walleij wrote:
> > > > On Thu, May 5, 2022 at 8:04 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> > > > > static struct snd_soc_jack_pin hs_jack_pin[] = {
> > > > >         {
> > > > >                 .pin    = "Headphone Jack",
> > > > >                 .mask   = SND_JACK_HEADPHONE,
> > > > >         },
> > > > >         {
> > > > >                 .pin    = "Speaker",
> > > > >                 /* disable speaker when hp jack is inserted */
> > > > >                 .mask   = SND_JACK_HEADPHONE,
> > > > >                 .invert = 1,
> > > > >         },
>
> > > > Hm some ASoC thingie. No idea what that is, but I suppose another
> > > > place where a subsystem for legacy reasons try to do the gpiolib
> > > > inversion on it's own accord. That one isn't flagged as active low in the
> > > > descriptor so it's fine I guess.
>
> > > It's saying that when the headphone is inserted the headphone output
> > > should be enabled and the speaker output should be disabled, and vice
> > > versa.
>
> > Ok, that sounds like I should remove the flag here if I declare the
> > GPIO line as GPIO_ACTIVE_LOW instead of GPIO_ACTIVE_HIGH, right?
>
> If you change the sense of the GPIO you'll need to flip the invert to
> the headphone instead of the speaker - whichever way round the GPIO
> sense is each of the pins should be taking the opposite sense from the
> GPIO state to the other.

Ok, I hope I got it this time:

- The hs_jack_gpio/"earphone-det" is declared as GPIO_ACTIVE_LOW,
    with the ".invert" dropped in the snd_soc_jack_gpio definition to match

- "spk-sd" is declared as GPIO_ACTIVE_LOW, so both
  this and  "hp-driver" are enabled by setting the gpio to active, rather than
  the two being opposites

- snd_soc_jack_pin flips the 'invert' flag from speaker to headphone, since
  the "earphone-det" is now  reversed

- hx4700_spk_power() flips polarity when setting the output to match the
  GPIO_ACTIVE_LOW setting, but hx4700_hp_power() does not change.

        Arnd

commit 20a9b05eff0488b78aa02c07f58654daa294069a
Author: Arnd Bergmann <arnd@arndb.de>
Date:   Wed Sep 11 14:27:13 2019 +0200

    ARM: pxa: hx4700: use gpio descriptors for audio

    The audio driver should not use a hardwired gpio number
    from the header. Change it to use a lookup table.

    Cc: Philipp Zabel <philipp.zabel@gmail.com>
    Cc: Paul Parsons <lost.distance@yahoo.com>
    Acked-by: Mark Brown <broonie@kernel.org>
    Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
    Cc: alsa-devel@alsa-project.org
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/mach-pxa/hx4700-pcmcia.c
b/arch/arm/mach-pxa/hx4700-pcmcia.c
index e8acbfc9ef6c..e2331dfe427d 100644
--- a/arch/arm/mach-pxa/hx4700-pcmcia.c
+++ b/arch/arm/mach-pxa/hx4700-pcmcia.c
@@ -10,7 +10,7 @@
 #include <linux/irq.h>

 #include <asm/mach-types.h>
-#include <mach/hx4700.h>
+#include "hx4700.h"

 #include <pcmcia/soc_common.h>

diff --git a/arch/arm/mach-pxa/hx4700.c b/arch/arm/mach-pxa/hx4700.c
index 140a44cb2989..2ae06edf413c 100644
--- a/arch/arm/mach-pxa/hx4700.c
+++ b/arch/arm/mach-pxa/hx4700.c
@@ -41,7 +41,7 @@

 #include "pxa27x.h"
 #include "addr-map.h"
-#include <mach/hx4700.h>
+#include "hx4700.h"
 #include <linux/platform_data/irda-pxaficp.h>

 #include <sound/ak4641.h>
@@ -834,6 +834,19 @@ static struct i2c_board_info i2c_board_info[]
__initdata = {
        },
 };

+static struct gpiod_lookup_table hx4700_audio_gpio_table = {
+       .dev_id = "hx4700-audio",
+       .table = {
+               GPIO_LOOKUP("gpio-pxa", GPIO75_HX4700_EARPHONE_nDET,
+                           "earphone-det", GPIO_ACTIVE_LOW),
+               GPIO_LOOKUP("gpio-pxa", GPIO92_HX4700_HP_DRIVER,
+                           "hp-driver", GPIO_ACTIVE_HIGH),
+               GPIO_LOOKUP("gpio-pxa", GPIO107_HX4700_SPK_nSD,
+                           "spk-sd", GPIO_ACTIVE_LOW),
+               { },
+       },
+};
+
 static struct platform_device audio = {
        .name   = "hx4700-audio",
        .id     = -1,
@@ -895,6 +908,7 @@ static void __init hx4700_init(void)

        gpiod_add_lookup_table(&bq24022_gpiod_table);
        gpiod_add_lookup_table(&gpio_vbus_gpiod_table);
+       gpiod_add_lookup_table(&hx4700_audio_gpio_table);
        platform_add_devices(devices, ARRAY_SIZE(devices));
        pwm_add_table(hx4700_pwm_lookup, ARRAY_SIZE(hx4700_pwm_lookup));

diff --git a/arch/arm/mach-pxa/include/mach/hx4700.h
b/arch/arm/mach-pxa/hx4700.h
similarity index 99%
rename from arch/arm/mach-pxa/include/mach/hx4700.h
rename to arch/arm/mach-pxa/hx4700.h
index 0c30e6d9c660..ce2db33989e1 100644
--- a/arch/arm/mach-pxa/include/mach/hx4700.h
+++ b/arch/arm/mach-pxa/hx4700.h
@@ -10,7 +10,7 @@

 #include <linux/gpio.h>
 #include <linux/mfd/asic3.h>
-#include "irqs.h" /* PXA_NR_BUILTIN_GPIO */
+#include <mach/irqs.h> /* PXA_NR_BUILTIN_GPIO */

 #define HX4700_ASIC3_GPIO_BASE PXA_NR_BUILTIN_GPIO
 #define HX4700_EGPIO_BASE      (HX4700_ASIC3_GPIO_BASE + ASIC3_NUM_GPIOS)
diff --git a/sound/soc/pxa/hx4700.c b/sound/soc/pxa/hx4700.c
index 7334fac758de..e6473c50e512 100644
--- a/sound/soc/pxa/hx4700.c
+++ b/sound/soc/pxa/hx4700.c
@@ -10,7 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>

 #include <sound/core.h>
 #include <sound/jack.h>
@@ -18,10 +18,10 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

-#include <mach/hx4700.h>
 #include <asm/mach-types.h>
 #include "pxa2xx-i2s.h"

+static struct gpio_desc *gpiod_hp_driver, *gpiod_spk_sd;
 static struct snd_soc_jack hs_jack;

 /* Headphones jack detection DAPM pin */
@@ -29,20 +29,18 @@ static struct snd_soc_jack_pin hs_jack_pin[] = {
        {
                .pin    = "Headphone Jack",
                .mask   = SND_JACK_HEADPHONE,
+               .invert = 1,
        },
        {
                .pin    = "Speaker",
                /* disable speaker when hp jack is inserted */
                .mask   = SND_JACK_HEADPHONE,
-               .invert = 1,
        },
 };

 /* Headphones jack detection GPIO */
 static struct snd_soc_jack_gpio hs_jack_gpio = {
-       .gpio           = GPIO75_HX4700_EARPHONE_nDET,
-       .invert         = true,
-       .name           = "hp-gpio",
+       .name           = "earphone-det",
        .report         = SND_JACK_HEADPHONE,
        .debounce_time  = 200,
 };
@@ -81,14 +79,14 @@ static const struct snd_soc_ops hx4700_ops = {
 static int hx4700_spk_power(struct snd_soc_dapm_widget *w,
                            struct snd_kcontrol *k, int event)
 {
-       gpio_set_value(GPIO107_HX4700_SPK_nSD, !!SND_SOC_DAPM_EVENT_ON(event));
+       gpiod_set_value(gpiod_spk_sd, !SND_SOC_DAPM_EVENT_ON(event));
        return 0;
 }

 static int hx4700_hp_power(struct snd_soc_dapm_widget *w,
                           struct snd_kcontrol *k, int event)
 {
-       gpio_set_value(GPIO92_HX4700_HP_DRIVER, !!SND_SOC_DAPM_EVENT_ON(event));
+       gpiod_set_value(gpiod_hp_driver, !!SND_SOC_DAPM_EVENT_ON(event));
        return 0;
 }

@@ -162,11 +160,6 @@ static struct snd_soc_card snd_soc_card_hx4700 = {
        .fully_routed           = true,
 };

-static struct gpio hx4700_audio_gpios[] = {
-       { GPIO107_HX4700_SPK_nSD, GPIOF_OUT_INIT_HIGH, "SPK_POWER" },
-       { GPIO92_HX4700_HP_DRIVER, GPIOF_OUT_INIT_LOW, "EP_POWER" },
-};
-
 static int hx4700_audio_probe(struct platform_device *pdev)
 {
        int ret;
@@ -174,26 +167,26 @@ static int hx4700_audio_probe(struct
platform_device *pdev)
        if (!machine_is_h4700())
                return -ENODEV;

-       ret = gpio_request_array(hx4700_audio_gpios,
-                               ARRAY_SIZE(hx4700_audio_gpios));
+       gpiod_hp_driver = devm_gpiod_get(&pdev->dev, "hp-driver", GPIOD_ASIS);
+       ret = PTR_ERR_OR_ZERO(gpiod_hp_driver);
+       if (ret)
+               return ret;
+       gpiod_spk_sd = devm_gpiod_get(&pdev->dev, "spk-sd", GPIOD_ASIS);
+       ret = PTR_ERR_OR_ZERO(gpiod_spk_sd);
        if (ret)
                return ret;

+       hs_jack_gpio.gpiod_dev = &pdev->dev;
        snd_soc_card_hx4700.dev = &pdev->dev;
        ret = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_hx4700);
-       if (ret)
-               gpio_free_array(hx4700_audio_gpios,
-                               ARRAY_SIZE(hx4700_audio_gpios));

        return ret;
 }

 static int hx4700_audio_remove(struct platform_device *pdev)
 {
-       gpio_set_value(GPIO92_HX4700_HP_DRIVER, 0);
-       gpio_set_value(GPIO107_HX4700_SPK_nSD, 0);
-
-       gpio_free_array(hx4700_audio_gpios, ARRAY_SIZE(hx4700_audio_gpios));
+       gpiod_set_value(gpiod_hp_driver, 0);
+       gpiod_set_value(gpiod_spk_sd, 0);
        return 0;
 }