forked from Minki/linux
dd41e0c4e3
The name of cpu DAI maybe omitted, and then strlen() will lead kernel panic. Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
272 lines
6.7 KiB
C
272 lines
6.7 KiB
C
/*
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* ASoC simple sound card support
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*
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* Copyright (C) 2012 Renesas Solutions Corp.
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <sound/simple_card.h>
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#define asoc_simple_get_card_info(p) \
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container_of(p->dai_link, struct asoc_simple_card_info, snd_link)
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static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
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struct asoc_simple_dai *set,
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unsigned int daifmt)
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{
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int ret = 0;
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daifmt |= set->fmt;
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if (!ret && daifmt)
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ret = snd_soc_dai_set_fmt(dai, daifmt);
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if (ret == -ENOTSUPP) {
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dev_dbg(dai->dev, "ASoC: set_fmt is not supported\n");
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ret = 0;
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}
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if (!ret && set->sysclk)
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ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
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return ret;
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}
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static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
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{
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struct asoc_simple_card_info *info = asoc_simple_get_card_info(rtd);
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struct snd_soc_dai *codec = rtd->codec_dai;
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struct snd_soc_dai *cpu = rtd->cpu_dai;
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unsigned int daifmt = info->daifmt;
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int ret;
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ret = __asoc_simple_card_dai_init(codec, &info->codec_dai, daifmt);
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if (ret < 0)
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return ret;
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ret = __asoc_simple_card_dai_init(cpu, &info->cpu_dai, daifmt);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int
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asoc_simple_card_sub_parse_of(struct device_node *np,
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struct asoc_simple_dai *dai,
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struct device_node **node)
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{
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struct clk *clk;
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int ret;
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/*
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* get node via "sound-dai = <&phandle port>"
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* it will be used as xxx_of_node on soc_bind_dai_link()
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*/
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*node = of_parse_phandle(np, "sound-dai", 0);
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if (!*node)
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return -ENODEV;
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/* get dai->name */
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ret = snd_soc_of_get_dai_name(np, &dai->name);
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if (ret < 0)
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goto parse_error;
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/*
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* bitclock-inversion, frame-inversion
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* bitclock-master, frame-master
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* and specific "format" if it has
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*/
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dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
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/*
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* dai->sysclk come from
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* "clocks = <&xxx>" (if system has common clock)
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* or "system-clock-frequency = <xxx>"
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*/
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clk = of_clk_get(np, 0);
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if (IS_ERR(clk))
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of_property_read_u32(np,
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"system-clock-frequency",
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&dai->sysclk);
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else
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dai->sysclk = clk_get_rate(clk);
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ret = 0;
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parse_error:
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of_node_put(*node);
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return ret;
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}
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static int asoc_simple_card_parse_of(struct device_node *node,
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struct asoc_simple_card_info *info,
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struct device *dev,
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struct device_node **of_cpu,
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struct device_node **of_codec,
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struct device_node **of_platform)
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{
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struct device_node *np;
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char *name;
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int ret = 0;
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/* get CPU/CODEC common format via simple-audio-card,format */
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info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
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(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
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/* CPU sub-node */
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ret = -EINVAL;
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np = of_get_child_by_name(node, "simple-audio-card,cpu");
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if (np)
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ret = asoc_simple_card_sub_parse_of(np,
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&info->cpu_dai,
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of_cpu);
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if (ret < 0)
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return ret;
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/* CODEC sub-node */
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ret = -EINVAL;
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np = of_get_child_by_name(node, "simple-audio-card,codec");
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if (np)
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ret = asoc_simple_card_sub_parse_of(np,
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&info->codec_dai,
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of_codec);
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if (ret < 0)
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return ret;
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if (!info->cpu_dai.name || !info->codec_dai.name)
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return -EINVAL;
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/* card name is created from CPU/CODEC dai name */
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name = devm_kzalloc(dev,
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strlen(info->cpu_dai.name) +
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strlen(info->codec_dai.name) + 2,
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GFP_KERNEL);
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sprintf(name, "%s-%s", info->cpu_dai.name, info->codec_dai.name);
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info->name = info->card = name;
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/* simple-card assumes platform == cpu */
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*of_platform = *of_cpu;
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dev_dbg(dev, "card-name : %s\n", info->card);
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dev_dbg(dev, "platform : %04x\n", info->daifmt);
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dev_dbg(dev, "cpu : %s / %04x / %d\n",
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info->cpu_dai.name,
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info->cpu_dai.fmt,
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info->cpu_dai.sysclk);
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dev_dbg(dev, "codec : %s / %04x / %d\n",
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info->codec_dai.name,
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info->codec_dai.fmt,
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info->codec_dai.sysclk);
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return 0;
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}
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static int asoc_simple_card_probe(struct platform_device *pdev)
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{
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struct asoc_simple_card_info *cinfo;
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struct device_node *np = pdev->dev.of_node;
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struct device_node *of_cpu, *of_codec, *of_platform;
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struct device *dev = &pdev->dev;
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cinfo = NULL;
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of_cpu = NULL;
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of_codec = NULL;
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of_platform = NULL;
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if (np && of_device_is_available(np)) {
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cinfo = devm_kzalloc(dev, sizeof(*cinfo), GFP_KERNEL);
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if (cinfo) {
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int ret;
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ret = asoc_simple_card_parse_of(np, cinfo, dev,
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&of_cpu,
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&of_codec,
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&of_platform);
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if (ret < 0) {
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "parse error %d\n", ret);
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return ret;
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}
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}
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} else {
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cinfo = pdev->dev.platform_data;
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}
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if (!cinfo) {
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dev_err(dev, "no info for asoc-simple-card\n");
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return -EINVAL;
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}
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if (!cinfo->name ||
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!cinfo->card ||
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!cinfo->codec_dai.name ||
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!(cinfo->codec || of_codec) ||
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!(cinfo->platform || of_platform) ||
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!(cinfo->cpu_dai.name || of_cpu)) {
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dev_err(dev, "insufficient asoc_simple_card_info settings\n");
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return -EINVAL;
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}
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/*
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* init snd_soc_dai_link
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*/
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cinfo->snd_link.name = cinfo->name;
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cinfo->snd_link.stream_name = cinfo->name;
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cinfo->snd_link.cpu_dai_name = cinfo->cpu_dai.name;
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cinfo->snd_link.platform_name = cinfo->platform;
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cinfo->snd_link.codec_name = cinfo->codec;
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cinfo->snd_link.codec_dai_name = cinfo->codec_dai.name;
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cinfo->snd_link.cpu_of_node = of_cpu;
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cinfo->snd_link.codec_of_node = of_codec;
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cinfo->snd_link.platform_of_node = of_platform;
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cinfo->snd_link.init = asoc_simple_card_dai_init;
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/*
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* init snd_soc_card
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*/
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cinfo->snd_card.name = cinfo->card;
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cinfo->snd_card.owner = THIS_MODULE;
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cinfo->snd_card.dai_link = &cinfo->snd_link;
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cinfo->snd_card.num_links = 1;
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cinfo->snd_card.dev = &pdev->dev;
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return snd_soc_register_card(&cinfo->snd_card);
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}
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static int asoc_simple_card_remove(struct platform_device *pdev)
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{
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struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
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return snd_soc_unregister_card(&cinfo->snd_card);
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}
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static const struct of_device_id asoc_simple_of_match[] = {
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{ .compatible = "simple-audio-card", },
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{},
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};
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MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
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static struct platform_driver asoc_simple_card = {
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.driver = {
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.name = "asoc-simple-card",
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.owner = THIS_MODULE,
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.of_match_table = asoc_simple_of_match,
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},
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.probe = asoc_simple_card_probe,
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.remove = asoc_simple_card_remove,
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};
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module_platform_driver(asoc_simple_card);
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MODULE_ALIAS("platform:asoc-simple-card");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ASoC Simple Sound Card");
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MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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