1 /* 2 * wm8524.c -- WM8524 ALSA SoC Audio driver 3 * 4 * Copyright 2009 Wolfson Microelectronics plc 5 * Copyright 2017 NXP 6 * 7 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/slab.h> 19 #include <linux/gpio/consumer.h> 20 #include <linux/of_device.h> 21 #include <sound/core.h> 22 #include <sound/pcm.h> 23 #include <sound/pcm_params.h> 24 #include <sound/soc.h> 25 #include <sound/initval.h> 26 27 #define WM8524_NUM_RATES 7 28 29 /* codec private data */ 30 struct wm8524_priv { 31 struct gpio_desc *mute; 32 unsigned int sysclk; 33 unsigned int rate_constraint_list[WM8524_NUM_RATES]; 34 struct snd_pcm_hw_constraint_list rate_constraint; 35 }; 36 37 38 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = { 39 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 40 SND_SOC_DAPM_OUTPUT("LINEVOUTL"), 41 SND_SOC_DAPM_OUTPUT("LINEVOUTR"), 42 }; 43 44 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = { 45 { "LINEVOUTL", NULL, "DAC" }, 46 { "LINEVOUTR", NULL, "DAC" }, 47 }; 48 49 static const struct { 50 int value; 51 int ratio; 52 } lrclk_ratios[WM8524_NUM_RATES] = { 53 { 1, 128 }, 54 { 2, 192 }, 55 { 3, 256 }, 56 { 4, 384 }, 57 { 5, 512 }, 58 { 6, 768 }, 59 { 7, 1152 }, 60 }; 61 62 static int wm8524_startup(struct snd_pcm_substream *substream, 63 struct snd_soc_dai *dai) 64 { 65 struct snd_soc_component *component = dai->component; 66 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 67 68 /* The set of sample rates that can be supported depends on the 69 * MCLK supplied to the CODEC - enforce this. 70 */ 71 if (!wm8524->sysclk) { 72 dev_err(component->dev, 73 "No MCLK configured, call set_sysclk() on init\n"); 74 return -EINVAL; 75 } 76 77 snd_pcm_hw_constraint_list(substream->runtime, 0, 78 SNDRV_PCM_HW_PARAM_RATE, 79 &wm8524->rate_constraint); 80 81 gpiod_set_value_cansleep(wm8524->mute, 1); 82 83 return 0; 84 } 85 86 static void wm8524_shutdown(struct snd_pcm_substream *substream, 87 struct snd_soc_dai *dai) 88 { 89 struct snd_soc_component *component = dai->component; 90 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 91 92 gpiod_set_value_cansleep(wm8524->mute, 0); 93 } 94 95 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai, 96 int clk_id, unsigned int freq, int dir) 97 { 98 struct snd_soc_component *component = codec_dai->component; 99 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 100 unsigned int val; 101 int i, j = 0; 102 103 wm8524->sysclk = freq; 104 105 wm8524->rate_constraint.count = 0; 106 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { 107 val = freq / lrclk_ratios[i].ratio; 108 /* Check that it's a standard rate since core can't 109 * cope with others and having the odd rates confuses 110 * constraint matching. 111 */ 112 switch (val) { 113 case 8000: 114 case 32000: 115 case 44100: 116 case 48000: 117 case 88200: 118 case 96000: 119 case 176400: 120 case 192000: 121 dev_dbg(component->dev, "Supported sample rate: %dHz\n", 122 val); 123 wm8524->rate_constraint_list[j++] = val; 124 wm8524->rate_constraint.count++; 125 break; 126 default: 127 dev_dbg(component->dev, "Skipping sample rate: %dHz\n", 128 val); 129 } 130 } 131 132 /* Need at least one supported rate... */ 133 if (wm8524->rate_constraint.count == 0) 134 return -EINVAL; 135 136 return 0; 137 } 138 139 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) 140 { 141 fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK | 142 SND_SOC_DAIFMT_MASTER_MASK); 143 144 if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 145 SND_SOC_DAIFMT_CBS_CFS)) { 146 dev_err(codec_dai->dev, "Invalid DAI format\n"); 147 return -EINVAL; 148 } 149 150 return 0; 151 } 152 153 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream) 154 { 155 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component); 156 157 if (wm8524->mute) 158 gpiod_set_value_cansleep(wm8524->mute, mute); 159 160 return 0; 161 } 162 163 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000 164 165 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) 166 167 static const struct snd_soc_dai_ops wm8524_dai_ops = { 168 .startup = wm8524_startup, 169 .shutdown = wm8524_shutdown, 170 .set_sysclk = wm8524_set_dai_sysclk, 171 .set_fmt = wm8524_set_fmt, 172 .mute_stream = wm8524_mute_stream, 173 }; 174 175 static struct snd_soc_dai_driver wm8524_dai = { 176 .name = "wm8524-hifi", 177 .playback = { 178 .stream_name = "Playback", 179 .channels_min = 2, 180 .channels_max = 2, 181 .rates = WM8524_RATES, 182 .formats = WM8524_FORMATS, 183 }, 184 .ops = &wm8524_dai_ops, 185 }; 186 187 static int wm8524_probe(struct snd_soc_component *component) 188 { 189 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 190 191 wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0]; 192 wm8524->rate_constraint.count = 193 ARRAY_SIZE(wm8524->rate_constraint_list); 194 195 return 0; 196 } 197 198 static const struct snd_soc_component_driver soc_component_dev_wm8524 = { 199 .probe = wm8524_probe, 200 .dapm_widgets = wm8524_dapm_widgets, 201 .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets), 202 .dapm_routes = wm8524_dapm_routes, 203 .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes), 204 .idle_bias_on = 1, 205 .use_pmdown_time = 1, 206 .endianness = 1, 207 .non_legacy_dai_naming = 1, 208 }; 209 210 static const struct of_device_id wm8524_of_match[] = { 211 { .compatible = "wlf,wm8524" }, 212 { /* sentinel*/ } 213 }; 214 MODULE_DEVICE_TABLE(of, wm8524_of_match); 215 216 static int wm8524_codec_probe(struct platform_device *pdev) 217 { 218 struct wm8524_priv *wm8524; 219 int ret; 220 221 wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv), 222 GFP_KERNEL); 223 if (wm8524 == NULL) 224 return -ENOMEM; 225 226 platform_set_drvdata(pdev, wm8524); 227 228 wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW); 229 if (IS_ERR(wm8524->mute)) { 230 ret = PTR_ERR(wm8524->mute); 231 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret); 232 return ret; 233 } 234 235 ret = devm_snd_soc_register_component(&pdev->dev, 236 &soc_component_dev_wm8524, &wm8524_dai, 1); 237 if (ret < 0) 238 dev_err(&pdev->dev, "Failed to register component: %d\n", ret); 239 240 return ret; 241 } 242 243 static struct platform_driver wm8524_codec_driver = { 244 .probe = wm8524_codec_probe, 245 .driver = { 246 .name = "wm8524-codec", 247 .of_match_table = wm8524_of_match, 248 }, 249 }; 250 module_platform_driver(wm8524_codec_driver); 251 252 MODULE_DESCRIPTION("ASoC WM8524 driver"); 253 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>"); 254 MODULE_ALIAS("platform:wm8524-codec"); 255 MODULE_LICENSE("GPL"); 256