--- /dev/null
+/*
+ * Clock Driver for Allo DAC
+ *
+ * Author: Baswaraj K <jaikumar@cem-solutions.net>
+ * Copyright 2016
+ * based on code by Stuart MacLean
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+
+/* Clock rate of CLK44EN attached to GPIO6 pin */
+#define CLK_44EN_RATE 45158400UL
+/* Clock rate of CLK48EN attached to GPIO3 pin */
+#define CLK_48EN_RATE 49152000UL
+
+/**
+ * struct allo_dac_clk - Common struct to the Allo DAC
+ * @hw: clk_hw for the common clk framework
+ * @mode: 0 => CLK44EN, 1 => CLK48EN
+ */
+struct clk_allo_hw {
+ struct clk_hw hw;
+ uint8_t mode;
+};
+
+#define to_allo_clk(_hw) container_of(_hw, struct clk_allo_hw, hw)
+
+static const struct of_device_id clk_allo_dac_dt_ids[] = {
+ { .compatible = "allo,dac-clk",},
+ { }
+};
+MODULE_DEVICE_TABLE(of, clk_allo_dac_dt_ids);
+
+static unsigned long clk_allo_dac_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ return (to_allo_clk(hw)->mode == 0) ? CLK_44EN_RATE :
+ CLK_48EN_RATE;
+}
+
+static long clk_allo_dac_round_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long *parent_rate)
+{
+ long actual_rate;
+
+ if (rate <= CLK_44EN_RATE) {
+ actual_rate = (long)CLK_44EN_RATE;
+ } else if (rate >= CLK_48EN_RATE) {
+ actual_rate = (long)CLK_48EN_RATE;
+ } else {
+ long diff44Rate = (long)(rate - CLK_44EN_RATE);
+ long diff48Rate = (long)(CLK_48EN_RATE - rate);
+
+ if (diff44Rate < diff48Rate)
+ actual_rate = (long)CLK_44EN_RATE;
+ else
+ actual_rate = (long)CLK_48EN_RATE;
+ }
+ return actual_rate;
+}
+
+
+static int clk_allo_dac_set_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long parent_rate)
+{
+ unsigned long actual_rate;
+ struct clk_allo_hw *clk = to_allo_clk(hw);
+
+ actual_rate = (unsigned long)clk_allo_dac_round_rate(hw, rate,
+ &parent_rate);
+ clk->mode = (actual_rate == CLK_44EN_RATE) ? 0 : 1;
+ return 0;
+}
+
+
+const struct clk_ops clk_allo_dac_rate_ops = {
+ .recalc_rate = clk_allo_dac_recalc_rate,
+ .round_rate = clk_allo_dac_round_rate,
+ .set_rate = clk_allo_dac_set_rate,
+};
+
+static int clk_allo_dac_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct clk_allo_hw *proclk;
+ struct clk *clk;
+ struct device *dev;
+ struct clk_init_data init;
+
+ dev = &pdev->dev;
+
+ proclk = kzalloc(sizeof(struct clk_allo_hw), GFP_KERNEL);
+ if (!proclk)
+ return -ENOMEM;
+
+ init.name = "clk-allo-dac";
+ init.ops = &clk_allo_dac_rate_ops;
+ init.flags = CLK_IS_BASIC;
+ init.parent_names = NULL;
+ init.num_parents = 0;
+
+ proclk->mode = 0;
+ proclk->hw.init = &init;
+
+ clk = devm_clk_register(dev, &proclk->hw);
+ if (!IS_ERR(clk)) {
+ ret = of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
+ clk);
+ } else {
+ dev_err(dev, "Fail to register clock driver\n");
+ kfree(proclk);
+ ret = PTR_ERR(clk);
+ }
+ return ret;
+}
+
+static int clk_allo_dac_remove(struct platform_device *pdev)
+{
+ of_clk_del_provider(pdev->dev.of_node);
+ return 0;
+}
+
+static struct platform_driver clk_allo_dac_driver = {
+ .probe = clk_allo_dac_probe,
+ .remove = clk_allo_dac_remove,
+ .driver = {
+ .name = "clk-allo-dac",
+ .of_match_table = clk_allo_dac_dt_ids,
+ },
+};
+
+static int __init clk_allo_dac_init(void)
+{
+ return platform_driver_register(&clk_allo_dac_driver);
+}
+core_initcall(clk_allo_dac_init);
+
+static void __exit clk_allo_dac_exit(void)
+{
+ platform_driver_unregister(&clk_allo_dac_driver);
+}
+module_exit(clk_allo_dac_exit);
+
+MODULE_DESCRIPTION("Allo DAC clock driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:clk-allo-dac");
--- /dev/null
+/*
+ * ALSA ASoC Machine Driver for Allo Boss DAC
+ *
+ * Author: Baswaraj K <jaikumar@cem-solutions.net>
+ * Copyright 2017
+ * based on code by Daniel Matuschek,
+ * Stuart MacLean <stuart@hifiberry.com>
+ * based on code by Florian Meier <florian.meier@koalo.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "../codecs/pcm512x.h"
+
+#define ALLO_BOSS_NOCLOCK 0
+#define ALLO_BOSS_CLK44EN 1
+#define ALLO_BOSS_CLK48EN 2
+
+struct pcm512x_priv {
+ struct regmap *regmap;
+ struct clk *sclk;
+};
+
+static struct gpio_desc *mute_gpio;
+
+/* Clock rate of CLK44EN attached to GPIO6 pin */
+#define CLK_44EN_RATE 45158400UL
+/* Clock rate of CLK48EN attached to GPIO3 pin */
+#define CLK_48EN_RATE 49152000UL
+
+static bool slave;
+static bool snd_soc_allo_boss_master;
+static bool digital_gain_0db_limit = true;
+
+static void snd_allo_boss_select_clk(struct snd_soc_component *component,
+ int clk_id)
+{
+ switch (clk_id) {
+ case ALLO_BOSS_NOCLOCK:
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
+ break;
+ case ALLO_BOSS_CLK44EN:
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
+ break;
+ case ALLO_BOSS_CLK48EN:
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
+ break;
+ }
+}
+
+static void snd_allo_boss_clk_gpio(struct snd_soc_component *component)
+{
+ snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x24, 0x24);
+ snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
+ snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
+}
+
+static bool snd_allo_boss_is_sclk(struct snd_soc_component *component)
+{
+ unsigned int sck;
+
+ snd_soc_component_read(component, PCM512x_RATE_DET_4, &sck);
+ return (!(sck & 0x40));
+}
+
+static bool snd_allo_boss_is_sclk_sleep(
+ struct snd_soc_component *component)
+{
+ msleep(2);
+ return snd_allo_boss_is_sclk(component);
+}
+
+static bool snd_allo_boss_is_master_card(struct snd_soc_component *component)
+{
+ bool isClk44EN, isClk48En, isNoClk;
+
+ snd_allo_boss_clk_gpio(component);
+
+ snd_allo_boss_select_clk(component, ALLO_BOSS_CLK44EN);
+ isClk44EN = snd_allo_boss_is_sclk_sleep(component);
+
+ snd_allo_boss_select_clk(component, ALLO_BOSS_NOCLOCK);
+ isNoClk = snd_allo_boss_is_sclk_sleep(component);
+
+ snd_allo_boss_select_clk(component, ALLO_BOSS_CLK48EN);
+ isClk48En = snd_allo_boss_is_sclk_sleep(component);
+
+ return (isClk44EN && isClk48En && !isNoClk);
+}
+
+static int snd_allo_boss_clk_for_rate(int sample_rate)
+{
+ int type;
+
+ switch (sample_rate) {
+ case 11025:
+ case 22050:
+ case 44100:
+ case 88200:
+ case 176400:
+ case 352800:
+ type = ALLO_BOSS_CLK44EN;
+ break;
+ default:
+ type = ALLO_BOSS_CLK48EN;
+ break;
+ }
+ return type;
+}
+
+static void snd_allo_boss_set_sclk(struct snd_soc_component *component,
+ int sample_rate)
+{
+ struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
+
+ if (!IS_ERR(pcm512x->sclk)) {
+ int ctype;
+
+ ctype = snd_allo_boss_clk_for_rate(sample_rate);
+ clk_set_rate(pcm512x->sclk, (ctype == ALLO_BOSS_CLK44EN)
+ ? CLK_44EN_RATE : CLK_48EN_RATE);
+ snd_allo_boss_select_clk(component, ctype);
+ }
+}
+
+static int snd_allo_boss_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
+
+ if (slave)
+ snd_soc_allo_boss_master = false;
+ else
+ snd_soc_allo_boss_master =
+ snd_allo_boss_is_master_card(component);
+
+ if (snd_soc_allo_boss_master) {
+ struct snd_soc_dai_link *dai = rtd->dai_link;
+
+ dai->name = "BossDAC";
+ dai->stream_name = "Boss DAC HiFi [Master]";
+ dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
+ | SND_SOC_DAIFMT_CBM_CFM;
+
+ snd_soc_component_update_bits(component, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11);
+ snd_soc_component_update_bits(component, PCM512x_MASTER_MODE, 0x03, 0x03);
+ snd_soc_component_update_bits(component, PCM512x_MASTER_CLKDIV_2, 0x7f, 63);
+ /*
+ * Default sclk to CLK_48EN_RATE, otherwise codec
+ * pcm512x_dai_startup_master method could call
+ * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
+ * which will mask 384k sample rate.
+ */
+ if (!IS_ERR(priv->sclk))
+ clk_set_rate(priv->sclk, CLK_48EN_RATE);
+ } else {
+ priv->sclk = ERR_PTR(-ENOENT);
+ }
+
+ snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08);
+ snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
+
+ if (digital_gain_0db_limit) {
+ int ret;
+ struct snd_soc_card *card = rtd->card;
+
+ ret = snd_soc_limit_volume(card, "Digital Playback Volume",
+ 207);
+ if (ret < 0)
+ dev_warn(card->dev, "Failed to set volume limit: %d\n",
+ ret);
+ }
+
+ return 0;
+}
+
+static int snd_allo_boss_update_rate_den(
+ struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
+ struct snd_ratnum *rats_no_pll;
+ unsigned int num = 0, den = 0;
+ int err;
+
+ rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL);
+ if (!rats_no_pll)
+ return -ENOMEM;
+
+ rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64;
+ rats_no_pll->den_min = 1;
+ rats_no_pll->den_max = 128;
+ rats_no_pll->den_step = 1;
+
+ err = snd_interval_ratnum(hw_param_interval(params,
+ SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den);
+ if (err >= 0 && den) {
+ params->rate_num = num;
+ params->rate_den = den;
+ }
+
+ devm_kfree(rtd->dev, rats_no_pll);
+ return 0;
+}
+
+static void snd_allo_boss_gpio_mute(struct snd_soc_card *card)
+{
+ if (mute_gpio)
+ gpiod_set_value_cansleep(mute_gpio, 1);
+}
+
+static void snd_allo_boss_gpio_unmute(struct snd_soc_card *card)
+{
+ if (mute_gpio)
+ gpiod_set_value_cansleep(mute_gpio, 0);
+}
+
+static int snd_allo_boss_set_bias_level(struct snd_soc_card *card,
+ struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
+{
+ struct snd_soc_pcm_runtime *rtd;
+ struct snd_soc_dai *codec_dai;
+
+ rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
+ codec_dai = rtd->codec_dai;
+
+ if (dapm->dev != codec_dai->dev)
+ return 0;
+
+ switch (level) {
+ case SND_SOC_BIAS_PREPARE:
+ if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
+ break;
+ /* UNMUTE DAC */
+ snd_allo_boss_gpio_unmute(card);
+ break;
+
+ case SND_SOC_BIAS_STANDBY:
+ if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
+ break;
+ /* MUTE DAC */
+ snd_allo_boss_gpio_mute(card);
+ break;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int snd_allo_boss_hw_params(
+ struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
+{
+ int ret = 0;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ int channels = params_channels(params);
+ int width = snd_pcm_format_physical_width(params_format(params));
+
+ if (snd_soc_allo_boss_master) {
+ struct snd_soc_component *component = rtd->codec_dai->component;
+
+ snd_allo_boss_set_sclk(component,
+ params_rate(params));
+
+ ret = snd_allo_boss_update_rate_den(
+ substream, params);
+ if (ret)
+ return ret;
+ }
+
+ ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x03, 0x03,
+ channels, width);
+ if (ret)
+ return ret;
+ ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03,
+ channels, width);
+ return ret;
+}
+
+static int snd_allo_boss_startup(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ struct snd_soc_card *card = rtd->card;
+
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
+ snd_allo_boss_gpio_mute(card);
+
+ if (snd_soc_allo_boss_master) {
+ struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
+ /*
+ * Default sclk to CLK_48EN_RATE, otherwise codec
+ * pcm512x_dai_startup_master method could call
+ * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
+ * which will mask 384k sample rate.
+ */
+ if (!IS_ERR(priv->sclk))
+ clk_set_rate(priv->sclk, CLK_48EN_RATE);
+ }
+
+ return 0;
+}
+
+static void snd_allo_boss_shutdown(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+
+ snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
+}
+
+static int snd_allo_boss_prepare(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_card *card = rtd->card;
+
+ snd_allo_boss_gpio_unmute(card);
+ return 0;
+}
+/* machine stream operations */
+static struct snd_soc_ops snd_allo_boss_ops = {
+ .hw_params = snd_allo_boss_hw_params,
+ .startup = snd_allo_boss_startup,
+ .shutdown = snd_allo_boss_shutdown,
+ .prepare = snd_allo_boss_prepare,
+};
+
+static struct snd_soc_dai_link snd_allo_boss_dai[] = {
+{
+ .name = "Boss DAC",
+ .stream_name = "Boss DAC HiFi",
+ .cpu_dai_name = "bcm2708-i2s.0",
+ .codec_dai_name = "pcm512x-hifi",
+ .platform_name = "bcm2708-i2s.0",
+ .codec_name = "pcm512x.1-004d",
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ .ops = &snd_allo_boss_ops,
+ .init = snd_allo_boss_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_allo_boss = {
+ .name = "BossDAC",
+ .owner = THIS_MODULE,
+ .dai_link = snd_allo_boss_dai,
+ .num_links = ARRAY_SIZE(snd_allo_boss_dai),
+};
+
+static int snd_allo_boss_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+
+ snd_allo_boss.dev = &pdev->dev;
+
+ if (pdev->dev.of_node) {
+ struct device_node *i2s_node;
+ struct snd_soc_dai_link *dai;
+
+ dai = &snd_allo_boss_dai[0];
+ i2s_node = of_parse_phandle(pdev->dev.of_node,
+ "i2s-controller", 0);
+
+ if (i2s_node) {
+ dai->cpu_dai_name = NULL;
+ dai->cpu_of_node = i2s_node;
+ dai->platform_name = NULL;
+ dai->platform_of_node = i2s_node;
+ }
+
+ digital_gain_0db_limit = !of_property_read_bool(
+ pdev->dev.of_node, "allo,24db_digital_gain");
+ slave = of_property_read_bool(pdev->dev.of_node,
+ "allo,slave");
+
+ mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(mute_gpio)) {
+ ret = PTR_ERR(mute_gpio);
+ dev_err(&pdev->dev,
+ "failed to get mute gpio: %d\n", ret);
+ return ret;
+ }
+
+ if (mute_gpio)
+ snd_allo_boss.set_bias_level =
+ snd_allo_boss_set_bias_level;
+
+ ret = snd_soc_register_card(&snd_allo_boss);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "snd_soc_register_card() failed: %d\n", ret);
+ return ret;
+ }
+
+ if (mute_gpio)
+ snd_allo_boss_gpio_mute(&snd_allo_boss);
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int snd_allo_boss_remove(struct platform_device *pdev)
+{
+ snd_allo_boss_gpio_mute(&snd_allo_boss);
+ return snd_soc_unregister_card(&snd_allo_boss);
+}
+
+static const struct of_device_id snd_allo_boss_of_match[] = {
+ { .compatible = "allo,boss-dac", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, snd_allo_boss_of_match);
+
+static struct platform_driver snd_allo_boss_driver = {
+ .driver = {
+ .name = "snd-allo-boss-dac",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_allo_boss_of_match,
+ },
+ .probe = snd_allo_boss_probe,
+ .remove = snd_allo_boss_remove,
+};
+
+module_platform_driver(snd_allo_boss_driver);
+
+MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
+MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Boss DAC");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff