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![Pierre-Louis Bossart](/assets/img/avatar_default.png)
cppcheck warning: sound/soc/samsung/snow.c:219:9: warning: Identical condition and return expression 'ret', return value is always 0 [identicalConditionAfterEarlyExit] return ret; ^ sound/soc/samsung/snow.c:215:6: note: If condition 'ret' is true, the function will return/exit if (ret) ^ sound/soc/samsung/snow.c:219:9: note: Returning identical expression 'ret' return ret; ^ Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com> Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com> Link: https://lore.kernel.org/r/20220520211719.607543-16-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
257 lines
5.9 KiB
C
257 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// ASoC machine driver for Snow boards
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include "i2s.h"
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#define FIN_PLL_RATE 24000000
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SND_SOC_DAILINK_DEFS(links,
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DAILINK_COMP_ARRAY(COMP_EMPTY()),
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DAILINK_COMP_ARRAY(COMP_EMPTY()),
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DAILINK_COMP_ARRAY(COMP_EMPTY()));
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struct snow_priv {
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struct snd_soc_dai_link dai_link;
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struct clk *clk_i2s_bus;
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};
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static int snow_card_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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static const unsigned int pll_rate[] = {
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73728000U, 67737602U, 49152000U, 45158401U, 32768001U
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};
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
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int bfs, psr, rfs, bitwidth;
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unsigned long int rclk;
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long int freq = -EINVAL;
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int ret, i;
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bitwidth = snd_pcm_format_width(params_format(params));
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if (bitwidth < 0) {
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dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
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return bitwidth;
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}
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if (bitwidth != 16 && bitwidth != 24) {
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dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
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return -EINVAL;
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}
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bfs = 2 * bitwidth;
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switch (params_rate(params)) {
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case 16000:
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case 22050:
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case 24000:
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case 32000:
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case 44100:
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case 48000:
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case 88200:
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case 96000:
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rfs = 8 * bfs;
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break;
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case 64000:
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rfs = 384;
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break;
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case 8000:
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case 11025:
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case 12000:
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rfs = 16 * bfs;
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break;
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default:
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return -EINVAL;
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}
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rclk = params_rate(params) * rfs;
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for (psr = 8; psr > 0; psr /= 2) {
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for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
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if ((pll_rate[i] - rclk * psr) <= 2) {
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freq = pll_rate[i];
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break;
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}
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}
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}
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if (freq < 0) {
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dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
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return -EINVAL;
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}
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ret = clk_set_rate(priv->clk_i2s_bus, freq);
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if (ret < 0) {
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dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
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return ret;
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}
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return 0;
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}
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static const struct snd_soc_ops snow_card_ops = {
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.hw_params = snow_card_hw_params,
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};
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static int snow_late_probe(struct snd_soc_card *card)
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{
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struct snd_soc_pcm_runtime *rtd;
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struct snd_soc_dai *codec_dai;
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rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
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/* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
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codec_dai = asoc_rtd_to_codec(rtd, 0);
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/* Set the MCLK rate for the codec */
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return snd_soc_dai_set_sysclk(codec_dai, 0,
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FIN_PLL_RATE, SND_SOC_CLOCK_IN);
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}
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static struct snd_soc_card snow_snd = {
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.name = "Snow-I2S",
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.owner = THIS_MODULE,
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.late_probe = snow_late_probe,
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};
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static int snow_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct snd_soc_card *card = &snow_snd;
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struct device_node *cpu, *codec;
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struct snd_soc_dai_link *link;
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struct snow_priv *priv;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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link = &priv->dai_link;
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link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBS_CFS;
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link->name = "Primary";
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link->stream_name = link->name;
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link->cpus = links_cpus;
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link->num_cpus = ARRAY_SIZE(links_cpus);
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link->codecs = links_codecs;
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link->num_codecs = ARRAY_SIZE(links_codecs);
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link->platforms = links_platforms;
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link->num_platforms = ARRAY_SIZE(links_platforms);
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card->dai_link = link;
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card->num_links = 1;
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card->dev = dev;
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/* Try new DT bindings with HDMI support first. */
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cpu = of_get_child_by_name(dev->of_node, "cpu");
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if (cpu) {
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link->ops = &snow_card_ops;
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link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
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of_node_put(cpu);
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if (!link->cpus->of_node) {
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dev_err(dev, "Failed parsing cpu/sound-dai property\n");
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return -EINVAL;
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}
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codec = of_get_child_by_name(dev->of_node, "codec");
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ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
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of_node_put(codec);
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if (ret < 0) {
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of_node_put(link->cpus->of_node);
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dev_err(dev, "Failed parsing codec node\n");
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return ret;
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}
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priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
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"i2s_opclk0");
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if (IS_ERR(priv->clk_i2s_bus)) {
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snd_soc_of_put_dai_link_codecs(link);
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of_node_put(link->cpus->of_node);
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return PTR_ERR(priv->clk_i2s_bus);
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}
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} else {
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link->codecs->dai_name = "HiFi";
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link->cpus->of_node = of_parse_phandle(dev->of_node,
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"samsung,i2s-controller", 0);
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if (!link->cpus->of_node) {
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dev_err(dev, "i2s-controller property parse error\n");
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return -EINVAL;
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}
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link->codecs->of_node = of_parse_phandle(dev->of_node,
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"samsung,audio-codec", 0);
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if (!link->codecs->of_node) {
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of_node_put(link->cpus->of_node);
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dev_err(dev, "audio-codec property parse error\n");
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return -EINVAL;
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}
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}
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link->platforms->of_node = link->cpus->of_node;
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/* Update card-name if provided through DT, else use default name */
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snd_soc_of_parse_card_name(card, "samsung,model");
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snd_soc_card_set_drvdata(card, priv);
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ret = devm_snd_soc_register_card(dev, card);
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if (ret)
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return dev_err_probe(&pdev->dev, ret,
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"snd_soc_register_card failed\n");
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return 0;
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}
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static int snow_remove(struct platform_device *pdev)
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{
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struct snow_priv *priv = platform_get_drvdata(pdev);
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struct snd_soc_dai_link *link = &priv->dai_link;
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of_node_put(link->cpus->of_node);
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of_node_put(link->codecs->of_node);
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snd_soc_of_put_dai_link_codecs(link);
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clk_put(priv->clk_i2s_bus);
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return 0;
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}
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static const struct of_device_id snow_of_match[] = {
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{ .compatible = "google,snow-audio-max98090", },
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{ .compatible = "google,snow-audio-max98091", },
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{ .compatible = "google,snow-audio-max98095", },
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{},
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};
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MODULE_DEVICE_TABLE(of, snow_of_match);
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static struct platform_driver snow_driver = {
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.driver = {
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.name = "snow-audio",
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.pm = &snd_soc_pm_ops,
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.of_match_table = snow_of_match,
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},
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.probe = snow_probe,
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.remove = snow_remove,
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};
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module_platform_driver(snow_driver);
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MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
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MODULE_LICENSE("GPL");
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