1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. 4 * 5 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board 6 */ 7 8 #include <linux/device.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/mod_devicetable.h> 12 #include <linux/platform_device.h> 13 #include <sound/pcm.h> 14 #include <sound/pcm_params.h> 15 #include <sound/soc.h> 16 17 #define STORM_SYSCLK_MULT 4 18 19 static int storm_ops_hw_params(struct snd_pcm_substream *substream, 20 struct snd_pcm_hw_params *params) 21 { 22 struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream); 23 struct snd_soc_card *card = soc_runtime->card; 24 snd_pcm_format_t format = params_format(params); 25 unsigned int rate = params_rate(params); 26 unsigned int sysclk_freq; 27 int bitwidth, ret; 28 29 bitwidth = snd_pcm_format_width(format); 30 if (bitwidth < 0) { 31 dev_err(card->dev, "invalid bit width given: %d\n", bitwidth); 32 return bitwidth; 33 } 34 35 /* 36 * as the CPU DAI is the I2S bus master and no system clock is needed by 37 * the MAX98357a DAC, simply set the system clock to be a constant 38 * multiple of the bit clock for the clock divider 39 */ 40 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT; 41 42 ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(soc_runtime, 0), 0, sysclk_freq, 0); 43 if (ret) { 44 dev_err(card->dev, "error setting sysclk to %u: %d\n", 45 sysclk_freq, ret); 46 return ret; 47 } 48 49 return 0; 50 } 51 52 static const struct snd_soc_ops storm_soc_ops = { 53 .hw_params = storm_ops_hw_params, 54 }; 55 56 SND_SOC_DAILINK_DEFS(hifi, 57 DAILINK_COMP_ARRAY(COMP_EMPTY()), 58 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")), 59 DAILINK_COMP_ARRAY(COMP_EMPTY())); 60 61 static struct snd_soc_dai_link storm_dai_link = { 62 .name = "Primary", 63 .stream_name = "Primary", 64 .ops = &storm_soc_ops, 65 SND_SOC_DAILINK_REG(hifi), 66 }; 67 68 static int storm_parse_of(struct snd_soc_card *card) 69 { 70 struct snd_soc_dai_link *dai_link = card->dai_link; 71 struct device_node *np = card->dev->of_node; 72 73 dai_link->cpus->of_node = of_parse_phandle(np, "cpu", 0); 74 if (!dai_link->cpus->of_node) { 75 dev_err(card->dev, "error getting cpu phandle\n"); 76 return -EINVAL; 77 } 78 dai_link->platforms->of_node = dai_link->cpus->of_node; 79 80 dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0); 81 if (!dai_link->codecs->of_node) { 82 dev_err(card->dev, "error getting codec phandle\n"); 83 return -EINVAL; 84 } 85 86 return 0; 87 } 88 89 static int storm_platform_probe(struct platform_device *pdev) 90 { 91 struct snd_soc_card *card; 92 int ret; 93 94 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); 95 if (!card) 96 return -ENOMEM; 97 98 card->dev = &pdev->dev; 99 card->owner = THIS_MODULE; 100 101 ret = snd_soc_of_parse_card_name(card, "qcom,model"); 102 if (ret) { 103 dev_err(&pdev->dev, "error parsing card name: %d\n", ret); 104 return ret; 105 } 106 107 card->dai_link = &storm_dai_link; 108 card->num_links = 1; 109 110 ret = storm_parse_of(card); 111 if (ret) { 112 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret); 113 return ret; 114 } 115 116 ret = devm_snd_soc_register_card(&pdev->dev, card); 117 if (ret) 118 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret); 119 120 return ret; 121 122 } 123 124 #ifdef CONFIG_OF 125 static const struct of_device_id storm_device_id[] = { 126 { .compatible = "google,storm-audio" }, 127 {}, 128 }; 129 MODULE_DEVICE_TABLE(of, storm_device_id); 130 #endif 131 132 static struct platform_driver storm_platform_driver = { 133 .driver = { 134 .name = "storm-audio", 135 .of_match_table = 136 of_match_ptr(storm_device_id), 137 }, 138 .probe = storm_platform_probe, 139 }; 140 module_platform_driver(storm_platform_driver); 141 142 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver"); 143 MODULE_LICENSE("GPL"); 144