[openwrt/staging/ldir.git] /

From 1aebaa90d468875109f0bf37cd89c7cfd9ac69bf Mon Sep 17 00:00:00 2001
From: Joerg Schambacher <joerg@i2audio.com>
Date: Fri, 29 Jan 2021 16:16:39 +0100
Subject: [PATCH] Enhances the Hifiberry DAC+ driver for Hifiberry
 AMP100 support

Adds the necessary GPIO handling and ALSA mixer extensions.
Also fixes a problem with the PLL/CLK control when switching sample rates.
Thanks to Clive Messer for the support!

Signed-off-by: Joerg Schambacher <joerg@hifiberry.com>
---
 sound/soc/bcm/hifiberry_dacplus.c | 124 ++++++++++++++++++++++++++----
 1 file changed, 111 insertions(+), 13 deletions(-)

--- a/sound/soc/bcm/hifiberry_dacplus.c
+++ b/sound/soc/bcm/hifiberry_dacplus.c
@@ -1,10 +1,10 @@
 /*
- * ASoC Driver for HiFiBerry DAC+ / DAC Pro
+ * ASoC Driver for HiFiBerry DAC+ / DAC Pro / AMP100
  *
  * Author:     Daniel Matuschek, Stuart MacLean <stuart@hifiberry.com>
  *             Copyright 2014-2015
  *             based on code by Florian Meier <florian.meier@koalo.de>
- *             Headphone added by Joerg Schambacher, joerg@i2audio.com
+ *             Headphone/AMP100 Joerg Schambacher <joerg@hifiberry.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -17,6 +17,8 @@
  */
 
 #include <linux/module.h>
+#include <linux/gpio/consumer.h>
+#include <../drivers/gpio/gpiolib.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/clk.h>
@@ -53,6 +55,47 @@ static bool slave;
 static bool snd_rpi_hifiberry_is_dacpro;
 static bool digital_gain_0db_limit = true;
 static bool leds_off;
+static bool auto_mute;
+static int mute_ext_ctl;
+static int mute_ext;
+static struct gpio_desc *snd_mute_gpio;
+static struct gpio_desc *snd_reset_gpio;
+static struct snd_soc_card snd_rpi_hifiberry_dacplus;
+
+static int snd_rpi_hifiberry_dacplus_mute_set(int mute)
+{
+       gpiod_set_value_cansleep(snd_mute_gpio, mute);
+       return 1;
+}
+
+static int snd_rpi_hifiberry_dacplus_mute_get(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *ucontrol)
+{
+       ucontrol->value.integer.value[0] = mute_ext;
+
+       return 0;
+}
+
+static int snd_rpi_hifiberry_dacplus_mute_put(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *ucontrol)
+{
+       if (mute_ext == ucontrol->value.integer.value[0])
+               return 0;
+
+       mute_ext = ucontrol->value.integer.value[0];
+
+       return snd_rpi_hifiberry_dacplus_mute_set(mute_ext);
+}
+
+static const char * const mute_text[] = {"Play", "Mute"};
+static const struct soc_enum hb_dacplus_opt_mute_enum =
+       SOC_ENUM_SINGLE_EXT(2, mute_text);
+
+static const struct snd_kcontrol_new hb_dacplus_opt_mute_controls[] = {
+       SOC_ENUM_EXT("Mute(ext)", hb_dacplus_opt_mute_enum,
+                             snd_rpi_hifiberry_dacplus_mute_get,
+                             snd_rpi_hifiberry_dacplus_mute_put),
+};
 
 static void snd_rpi_hifiberry_dacplus_select_clk(struct snd_soc_component *component,
        int clk_id)
@@ -68,6 +111,7 @@ static void snd_rpi_hifiberry_dacplus_se
                snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
                break;
        }
+       usleep_range(2000, 2100);
 }
 
 static void snd_rpi_hifiberry_dacplus_clk_gpio(struct snd_soc_component *component)
@@ -85,13 +129,6 @@ static bool snd_rpi_hifiberry_dacplus_is
        return (!(sck & 0x40));
 }
 
-static bool snd_rpi_hifiberry_dacplus_is_sclk_sleep(
-       struct snd_soc_component *component)
-{
-       msleep(2);
-       return snd_rpi_hifiberry_dacplus_is_sclk(component);
-}
-
 static bool snd_rpi_hifiberry_dacplus_is_pro_card(struct snd_soc_component *component)
 {
        bool isClk44EN, isClk48En, isNoClk;
@@ -99,13 +136,13 @@ static bool snd_rpi_hifiberry_dacplus_is
        snd_rpi_hifiberry_dacplus_clk_gpio(component);
 
        snd_rpi_hifiberry_dacplus_select_clk(component, HIFIBERRY_DACPRO_CLK44EN);
-       isClk44EN = snd_rpi_hifiberry_dacplus_is_sclk_sleep(component);
+       isClk44EN = snd_rpi_hifiberry_dacplus_is_sclk(component);
 
        snd_rpi_hifiberry_dacplus_select_clk(component, HIFIBERRY_DACPRO_NOCLOCK);
-       isNoClk = snd_rpi_hifiberry_dacplus_is_sclk_sleep(component);
+       isNoClk = snd_rpi_hifiberry_dacplus_is_sclk(component);
 
        snd_rpi_hifiberry_dacplus_select_clk(component, HIFIBERRY_DACPRO_CLK48EN);
-       isClk48En = snd_rpi_hifiberry_dacplus_is_sclk_sleep(component);
+       isClk48En = snd_rpi_hifiberry_dacplus_is_sclk(component);
 
        return (isClk44EN && isClk48En && !isNoClk);
 }
@@ -149,6 +186,7 @@ static int snd_rpi_hifiberry_dacplus_ini
 {
        struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
        struct pcm512x_priv *priv;
+       struct snd_soc_card *card = &snd_rpi_hifiberry_dacplus;
 
        if (slave)
                snd_rpi_hifiberry_is_dacpro = false;
@@ -187,6 +225,20 @@ static int snd_rpi_hifiberry_dacplus_ini
                if (ret < 0)
                        dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
        }
+       if (snd_reset_gpio) {
+               gpiod_set_value_cansleep(snd_reset_gpio, 0);
+               msleep(1);
+               gpiod_set_value_cansleep(snd_reset_gpio, 1);
+               msleep(1);
+               gpiod_set_value_cansleep(snd_reset_gpio, 0);
+       }
+
+       if (mute_ext_ctl)
+               snd_soc_add_card_controls(card, hb_dacplus_opt_mute_controls,
+                               ARRAY_SIZE(hb_dacplus_opt_mute_controls));
+
+       if (snd_mute_gpio)
+               gpiod_set_value_cansleep(snd_mute_gpio, mute_ext);
 
        return 0;
 }
@@ -254,6 +306,8 @@ static int snd_rpi_hifiberry_dacplus_sta
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
 
+       if (auto_mute)
+               gpiod_set_value_cansleep(snd_mute_gpio, 0);
        if (leds_off)
                return 0;
        snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
@@ -267,6 +321,8 @@ static void snd_rpi_hifiberry_dacplus_sh
        struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
 
        snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
+       if (auto_mute)
+               gpiod_set_value_cansleep(snd_mute_gpio, 1);
 }
 
 /* machine stream operations */
@@ -342,6 +398,8 @@ static int snd_rpi_hifiberry_dacplus_pro
        struct device_node *tpa_node;
        struct property *tpa_prop;
        struct of_changeset ocs;
+       struct property *pp;
+       int tmp;
 
        /* probe for head phone amp */
        ret = hb_hp_detect();
@@ -396,6 +454,39 @@ static int snd_rpi_hifiberry_dacplus_pro
                                                "hifiberry-dacplus,slave");
                leds_off = of_property_read_bool(pdev->dev.of_node,
                                                "hifiberry-dacplus,leds_off");
+               auto_mute = of_property_read_bool(pdev->dev.of_node,
+                                               "hifiberry-dacplus,auto_mute");
+
+               /*
+                * check for HW MUTE as defined in DT-overlay
+                * active high, therefore default to HIGH to MUTE
+                */
+               snd_mute_gpio = devm_gpiod_get_optional(&pdev->dev,
+                                                "mute", GPIOD_OUT_HIGH);
+               if (IS_ERR(snd_mute_gpio)) {
+                       dev_err(&pdev->dev, "Can't allocate GPIO (HW-MUTE)");
+                       return PTR_ERR(snd_mute_gpio);
+               }
+
+               /* add ALSA control if requested in DT-overlay (AMP100) */
+               pp = of_find_property(pdev->dev.of_node,
+                               "hifiberry-dacplus,mute_ext_ctl", &tmp);
+               if (pp) {
+                       if (!of_property_read_u32(pdev->dev.of_node,
+                               "hifiberry-dacplus,mute_ext_ctl", &mute_ext)) {
+                               /* ALSA control will be used */
+                               mute_ext_ctl = 1;
+                       }
+               }
+
+               /* check for HW RESET (AMP100) */
+               snd_reset_gpio = devm_gpiod_get_optional(&pdev->dev,
+                                               "reset", GPIOD_OUT_HIGH);
+               if (IS_ERR(snd_reset_gpio)) {
+                       dev_err(&pdev->dev, "Can't allocate GPIO (HW-RESET)");
+                       return PTR_ERR(snd_reset_gpio);
+               }
+
        }
 
        ret = devm_snd_soc_register_card(&pdev->dev,
@@ -403,7 +494,14 @@ static int snd_rpi_hifiberry_dacplus_pro
        if (ret && ret != -EPROBE_DEFER)
                dev_err(&pdev->dev,
                        "snd_soc_register_card() failed: %d\n", ret);
-
+       if (!ret) {
+               if (snd_mute_gpio)
+                       dev_info(&pdev->dev, "GPIO%i for HW-MUTE selected",
+                                       gpio_chip_hwgpio(snd_mute_gpio));
+               if (snd_reset_gpio)
+                       dev_info(&pdev->dev, "GPIO%i for HW-RESET selected",
+                                       gpio_chip_hwgpio(snd_reset_gpio));
+       }
        return ret;
 }