1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * wm8524.c -- WM8524 ALSA SoC Audio driver 4 * 5 * Copyright 2009 Wolfson Microelectronics plc 6 * Copyright 2017 NXP 7 * 8 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown 9 */ 10 11 #include <linux/module.h> 12 #include <linux/moduleparam.h> 13 #include <linux/init.h> 14 #include <linux/delay.h> 15 #include <linux/slab.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/of_device.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/pcm_params.h> 21 #include <sound/soc.h> 22 #include <sound/initval.h> 23 24 #define WM8524_NUM_RATES 7 25 26 /* codec private data */ 27 struct wm8524_priv { 28 struct gpio_desc *mute; 29 unsigned int sysclk; 30 unsigned int rate_constraint_list[WM8524_NUM_RATES]; 31 struct snd_pcm_hw_constraint_list rate_constraint; 32 }; 33 34 35 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = { 36 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 37 SND_SOC_DAPM_OUTPUT("LINEVOUTL"), 38 SND_SOC_DAPM_OUTPUT("LINEVOUTR"), 39 }; 40 41 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = { 42 { "LINEVOUTL", NULL, "DAC" }, 43 { "LINEVOUTR", NULL, "DAC" }, 44 }; 45 46 static const struct { 47 int value; 48 int ratio; 49 } lrclk_ratios[WM8524_NUM_RATES] = { 50 { 1, 128 }, 51 { 2, 192 }, 52 { 3, 256 }, 53 { 4, 384 }, 54 { 5, 512 }, 55 { 6, 768 }, 56 { 7, 1152 }, 57 }; 58 59 static int wm8524_startup(struct snd_pcm_substream *substream, 60 struct snd_soc_dai *dai) 61 { 62 struct snd_soc_component *component = dai->component; 63 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 64 65 /* The set of sample rates that can be supported depends on the 66 * MCLK supplied to the CODEC - enforce this. 67 */ 68 if (!wm8524->sysclk) { 69 dev_err(component->dev, 70 "No MCLK configured, call set_sysclk() on init\n"); 71 return -EINVAL; 72 } 73 74 snd_pcm_hw_constraint_list(substream->runtime, 0, 75 SNDRV_PCM_HW_PARAM_RATE, 76 &wm8524->rate_constraint); 77 78 gpiod_set_value_cansleep(wm8524->mute, 1); 79 80 return 0; 81 } 82 83 static void wm8524_shutdown(struct snd_pcm_substream *substream, 84 struct snd_soc_dai *dai) 85 { 86 struct snd_soc_component *component = dai->component; 87 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 88 89 gpiod_set_value_cansleep(wm8524->mute, 0); 90 } 91 92 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai, 93 int clk_id, unsigned int freq, int dir) 94 { 95 struct snd_soc_component *component = codec_dai->component; 96 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 97 unsigned int val; 98 int i, j = 0; 99 100 wm8524->sysclk = freq; 101 102 wm8524->rate_constraint.count = 0; 103 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { 104 val = freq / lrclk_ratios[i].ratio; 105 /* Check that it's a standard rate since core can't 106 * cope with others and having the odd rates confuses 107 * constraint matching. 108 */ 109 switch (val) { 110 case 8000: 111 case 32000: 112 case 44100: 113 case 48000: 114 case 88200: 115 case 96000: 116 case 176400: 117 case 192000: 118 dev_dbg(component->dev, "Supported sample rate: %dHz\n", 119 val); 120 wm8524->rate_constraint_list[j++] = val; 121 wm8524->rate_constraint.count++; 122 break; 123 default: 124 dev_dbg(component->dev, "Skipping sample rate: %dHz\n", 125 val); 126 } 127 } 128 129 /* Need at least one supported rate... */ 130 if (wm8524->rate_constraint.count == 0) 131 return -EINVAL; 132 133 return 0; 134 } 135 136 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) 137 { 138 fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK | 139 SND_SOC_DAIFMT_MASTER_MASK); 140 141 if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 142 SND_SOC_DAIFMT_CBS_CFS)) { 143 dev_err(codec_dai->dev, "Invalid DAI format\n"); 144 return -EINVAL; 145 } 146 147 return 0; 148 } 149 150 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream) 151 { 152 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component); 153 154 if (wm8524->mute) 155 gpiod_set_value_cansleep(wm8524->mute, mute); 156 157 return 0; 158 } 159 160 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000 161 162 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) 163 164 static const struct snd_soc_dai_ops wm8524_dai_ops = { 165 .startup = wm8524_startup, 166 .shutdown = wm8524_shutdown, 167 .set_sysclk = wm8524_set_dai_sysclk, 168 .set_fmt = wm8524_set_fmt, 169 .mute_stream = wm8524_mute_stream, 170 }; 171 172 static struct snd_soc_dai_driver wm8524_dai = { 173 .name = "wm8524-hifi", 174 .playback = { 175 .stream_name = "Playback", 176 .channels_min = 2, 177 .channels_max = 2, 178 .rates = WM8524_RATES, 179 .formats = WM8524_FORMATS, 180 }, 181 .ops = &wm8524_dai_ops, 182 }; 183 184 static int wm8524_probe(struct snd_soc_component *component) 185 { 186 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component); 187 188 wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0]; 189 wm8524->rate_constraint.count = 190 ARRAY_SIZE(wm8524->rate_constraint_list); 191 192 return 0; 193 } 194 195 static const struct snd_soc_component_driver soc_component_dev_wm8524 = { 196 .probe = wm8524_probe, 197 .dapm_widgets = wm8524_dapm_widgets, 198 .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets), 199 .dapm_routes = wm8524_dapm_routes, 200 .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes), 201 .idle_bias_on = 1, 202 .use_pmdown_time = 1, 203 .endianness = 1, 204 .non_legacy_dai_naming = 1, 205 }; 206 207 static const struct of_device_id wm8524_of_match[] = { 208 { .compatible = "wlf,wm8524" }, 209 { /* sentinel*/ } 210 }; 211 MODULE_DEVICE_TABLE(of, wm8524_of_match); 212 213 static int wm8524_codec_probe(struct platform_device *pdev) 214 { 215 struct wm8524_priv *wm8524; 216 int ret; 217 218 wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv), 219 GFP_KERNEL); 220 if (wm8524 == NULL) 221 return -ENOMEM; 222 223 platform_set_drvdata(pdev, wm8524); 224 225 wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW); 226 if (IS_ERR(wm8524->mute)) { 227 ret = PTR_ERR(wm8524->mute); 228 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret); 229 return ret; 230 } 231 232 ret = devm_snd_soc_register_component(&pdev->dev, 233 &soc_component_dev_wm8524, &wm8524_dai, 1); 234 if (ret < 0) 235 dev_err(&pdev->dev, "Failed to register component: %d\n", ret); 236 237 return ret; 238 } 239 240 static struct platform_driver wm8524_codec_driver = { 241 .probe = wm8524_codec_probe, 242 .driver = { 243 .name = "wm8524-codec", 244 .of_match_table = wm8524_of_match, 245 }, 246 }; 247 module_platform_driver(wm8524_codec_driver); 248 249 MODULE_DESCRIPTION("ASoC WM8524 driver"); 250 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>"); 251 MODULE_ALIAS("platform:wm8524-codec"); 252 MODULE_LICENSE("GPL"); 253