projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a3a1cb1 CM |
1 | /* |
| 2 | * ALSA ASoC Machine Driver for Allo Piano DAC | |
| 3 | * | |
| 4 | * Author: Baswaraj K <jaikumar@cem-solutions.net> | |
| 5 | * Copyright 2016 | |
| 6 | * based on code by Daniel Matuschek <info@crazy-audio.com> | |
| 7 | * based on code by Florian Meier <florian.meier@koalo.de> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License | |
| 11 | * version 2 as published by the Free Software Foundation. | |
| 12 | * | |
| 13 | * This program is distributed in the hope that it will be useful, but | |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | * General Public License for more details. | |
| 17 | */ | |
| 18 | ||
| 19 | #include <linux/module.h> | |
| 20 | #include <linux/platform_device.h> | |
| 21 | ||
| 22 | #include <sound/core.h> | |
| 23 | #include <sound/pcm.h> | |
| 24 | #include <sound/pcm_params.h> | |
| 25 | #include <sound/soc.h> | |
| 26 | ||
| 27 | static bool digital_gain_0db_limit = true; | |
| 28 | ||
| 29 | static int snd_allo_piano_dac_init(struct snd_soc_pcm_runtime *rtd) | |
| 30 | { | |
| 31 | if (digital_gain_0db_limit) { | |
| 32 | int ret; | |
| 33 | struct snd_soc_card *card = rtd->card; | |
| 34 | ||
| 35 | ret = snd_soc_limit_volume(card, "Digital Playback Volume", | |
| 36 | 207); | |
| 37 | if (ret < 0) | |
| 38 | dev_warn(card->dev, "Failed to set volume limit: %d\n", | |
| 39 | ret); | |
| 40 | } | |
| 41 | ||
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 45 | static int snd_allo_piano_dac_hw_params( | |
| 46 | struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) | |
| 47 | { | |
| 48 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
| 49 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; | |
| 50 | ||
| 51 | unsigned int sample_bits = | |
| 52 | snd_pcm_format_physical_width(params_format(params)); | |
| 53 | ||
| 54 | return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2); | |
| 55 | } | |
| 56 | ||
| 57 | /* machine stream operations */ | |
| 58 | static struct snd_soc_ops snd_allo_piano_dac_ops = { | |
| 59 | .hw_params = snd_allo_piano_dac_hw_params, | |
| 60 | }; | |
| 61 | ||
| 62 | static struct snd_soc_dai_link snd_allo_piano_dac_dai[] = { | |
| 63 | { | |
| 64 | .name = "Piano DAC", | |
| 65 | .stream_name = "Piano DAC HiFi", | |
| 66 | .cpu_dai_name = "bcm2708-i2s.0", | |
| 67 | .codec_dai_name = "pcm512x-hifi", | |
| 68 | .platform_name = "bcm2708-i2s.0", | |
| 69 | .codec_name = "pcm512x.1-004c", | |
| 70 | .dai_fmt = SND_SOC_DAIFMT_I2S | | |
| 71 | SND_SOC_DAIFMT_NB_NF | | |
| 72 | SND_SOC_DAIFMT_CBS_CFS, | |
| 73 | .ops = &snd_allo_piano_dac_ops, | |
| 74 | .init = snd_allo_piano_dac_init, | |
| 75 | }, | |
| 76 | }; | |
| 77 | ||
| 78 | /* audio machine driver */ | |
| 79 | static struct snd_soc_card snd_allo_piano_dac = { | |
| 80 | .name = "PianoDAC", | |
| 81 | .owner = THIS_MODULE, | |
| 82 | .dai_link = snd_allo_piano_dac_dai, | |
| 83 | .num_links = ARRAY_SIZE(snd_allo_piano_dac_dai), | |
| 84 | }; | |
| 85 | ||
| 86 | static int snd_allo_piano_dac_probe(struct platform_device *pdev) | |
| 87 | { | |
| 88 | int ret = 0; | |
| 89 | ||
| 90 | snd_allo_piano_dac.dev = &pdev->dev; | |
| 91 | ||
| 92 | if (pdev->dev.of_node) { | |
| 93 | struct device_node *i2s_node; | |
| 94 | struct snd_soc_dai_link *dai; | |
| 95 | ||
| 96 | dai = &snd_allo_piano_dac_dai[0]; | |
| 97 | i2s_node = of_parse_phandle(pdev->dev.of_node, | |
| 98 | "i2s-controller", 0); | |
| 99 | ||
| 100 | if (i2s_node) { | |
| 101 | dai->cpu_dai_name = NULL; | |
| 102 | dai->cpu_of_node = i2s_node; | |
| 103 | dai->platform_name = NULL; | |
| 104 | dai->platform_of_node = i2s_node; | |
| 105 | } | |
| 106 | ||
| 107 | digital_gain_0db_limit = !of_property_read_bool( | |
| 108 | pdev->dev.of_node, "allo,24db_digital_gain"); | |
| 109 | } | |
| 110 | ||
| 111 | ret = snd_soc_register_card(&snd_allo_piano_dac); | |
| 49dbf1af | 112 | if (ret && ret != -EPROBE_DEFER) |
| 1a3a1cb1 CM |
113 | dev_err(&pdev->dev, |
| 114 | "snd_soc_register_card() failed: %d\n", ret); | |
| 115 | ||
| 116 | return ret; | |
| 117 | } | |
| 118 | ||
| 119 | static int snd_allo_piano_dac_remove(struct platform_device *pdev) | |
| 120 | { | |
| 121 | return snd_soc_unregister_card(&snd_allo_piano_dac); | |
| 122 | } | |
| 123 | ||
| 124 | static const struct of_device_id snd_allo_piano_dac_of_match[] = { | |
| 125 | { .compatible = "allo,piano-dac", }, | |
| 126 | { /* sentinel */ }, | |
| 127 | }; | |
| 128 | MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match); | |
| 129 | ||
| 130 | static struct platform_driver snd_allo_piano_dac_driver = { | |
| 131 | .driver = { | |
| 132 | .name = "snd-allo-piano-dac", | |
| 133 | .owner = THIS_MODULE, | |
| 134 | .of_match_table = snd_allo_piano_dac_of_match, | |
| 135 | }, | |
| 136 | .probe = snd_allo_piano_dac_probe, | |
| 137 | .remove = snd_allo_piano_dac_remove, | |
| 138 | }; | |
| 139 | ||
| 140 | module_platform_driver(snd_allo_piano_dac_driver); | |
| 141 | ||
| 142 | MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>"); | |
| 143 | MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC"); | |
| 144 | MODULE_LICENSE("GPL v2"); |