diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0883-Enhances-the-DAC-driver-to-control-the-optional-head.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0883-Enhances-the-DAC-driver-to-control-the-optional-head.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0883-Enhances-the-DAC-driver-to-control-the-optional-head.patch b/target/linux/bcm27xx/patches-5.4/950-0883-Enhances-the-DAC-driver-to-control-the-optional-head.patch new file mode 100644 index 0000000000..128906026d --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0883-Enhances-the-DAC-driver-to-control-the-optional-head.patch @@ -0,0 +1,134 @@ +From defa915bf0acf6ab5e56997a6733546c33f87682 Mon Sep 17 00:00:00 2001 +From: Joerg Schambacher <joerg@i2audio.com> +Date: Tue, 7 Jul 2020 15:09:06 +0200 +Subject: [PATCH] Enhances the DAC+ driver to control the optional + headphone amplifier + +Probes on the I2C bus for TPA6130A2, if successful, it sets DT-parameter +'status' from 'disabled' to 'okay' using change_sets to enable +the headphone control. + +Signed-off-by: Joerg Schambacher joerg@i2audio.com +--- + sound/soc/bcm/Kconfig | 1 + + sound/soc/bcm/hifiberry_dacplus.c | 68 ++++++++++++++++++++++++++++++- + 2 files changed, 67 insertions(+), 2 deletions(-) + +--- a/sound/soc/bcm/Kconfig ++++ b/sound/soc/bcm/Kconfig +@@ -38,6 +38,7 @@ config SND_BCM2708_SOC_HIFIBERRY_DACPLUS + tristate "Support for HifiBerry DAC+" + depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S + select SND_SOC_PCM512x ++ select SND_SOC_TPA6130A2 + select COMMON_CLK_HIFIBERRY_DACPRO + help + Say Y or M if you want to add support for HifiBerry DAC+. +--- a/sound/soc/bcm/hifiberry_dacplus.c ++++ b/sound/soc/bcm/hifiberry_dacplus.c +@@ -4,6 +4,7 @@ + * 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 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License +@@ -24,6 +25,7 @@ + #include <linux/of.h> + #include <linux/slab.h> + #include <linux/delay.h> ++#include <linux/i2c.h> + + #include <sound/core.h> + #include <sound/pcm.h> +@@ -177,8 +179,7 @@ static int snd_rpi_hifiberry_dacplus_ini + else + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08); + +- if (digital_gain_0db_limit) +- { ++ if (digital_gain_0db_limit) { + int ret; + struct snd_soc_card *card = rtd->card; + +@@ -292,6 +293,15 @@ static struct snd_soc_dai_link snd_rpi_h + }, + }; + ++/* aux device for optional headphone amp */ ++static struct snd_soc_aux_dev hifiberry_dacplus_aux_devs[] = { ++ { ++ .dlc = { ++ .name = "tpa6130a2.1-0060", ++ }, ++ }, ++}; ++ + /* audio machine driver */ + static struct snd_soc_card snd_rpi_hifiberry_dacplus = { + .name = "snd_rpi_hifiberry_dacplus", +@@ -301,9 +311,63 @@ static struct snd_soc_card snd_rpi_hifib + .num_links = ARRAY_SIZE(snd_rpi_hifiberry_dacplus_dai), + }; + ++static int hb_hp_detect(void) ++{ ++ struct i2c_adapter *adap = i2c_get_adapter(1); ++ int ret; ++ ++ struct i2c_client tpa_i2c_client = { ++ .addr = 0x60, ++ .adapter = adap, ++ }; ++ ++ ret = i2c_smbus_read_byte(&tpa_i2c_client) >= 0; ++ i2c_put_adapter(adap); ++ return ret; ++}; ++ ++static struct property tpa_enable_prop = { ++ .name = "status", ++ .length = 4 + 1, /* length 'okay' + 1 */ ++ .value = "okay", ++ }; ++ + static int snd_rpi_hifiberry_dacplus_probe(struct platform_device *pdev) + { + int ret = 0; ++ struct snd_soc_card *card = &snd_rpi_hifiberry_dacplus; ++ int len; ++ struct device_node *tpa_node; ++ struct property *tpa_prop; ++ struct of_changeset ocs; ++ ++ /* probe for head phone amp */ ++ if (hb_hp_detect()) { ++ card->aux_dev = hifiberry_dacplus_aux_devs; ++ card->num_aux_devs = ++ ARRAY_SIZE(hifiberry_dacplus_aux_devs); ++ tpa_node = of_find_compatible_node(NULL, NULL, "ti,tpa6130a2"); ++ tpa_prop = of_find_property(tpa_node, "status", &len); ++ ++ if (strcmp((char *)tpa_prop->value, "okay")) { ++ /* and activate headphone using change_sets */ ++ dev_info(&pdev->dev, "activating headphone amplifier"); ++ of_changeset_init(&ocs); ++ ret = of_changeset_update_property(&ocs, tpa_node, ++ &tpa_enable_prop); ++ if (ret) { ++ dev_err(&pdev->dev, ++ "cannot activate headphone amplifier\n"); ++ return -ENODEV; ++ } ++ ret = of_changeset_apply(&ocs); ++ if (ret) { ++ dev_err(&pdev->dev, ++ "cannot activate headphone amplifier\n"); ++ return -ENODEV; ++ } ++ } ++ } + + snd_rpi_hifiberry_dacplus.dev = &pdev->dev; + if (pdev->dev.of_node) { |