1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based 4 * ATMEL AT91SAM9G20ek board. 5 * 6 * Copyright (C) 2005 SAN People 7 * Copyright (C) 2008 Atmel 8 * 9 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> 10 * 11 * Based on ati_b1_wm8731.c by: 12 * Frank Mandarino <fmandarino@endrelia.com> 13 * Copyright 2006 Endrelia Technologies Inc. 14 * Based on corgi.c by: 15 * Copyright 2005 Wolfson Microelectronics PLC. 16 * Copyright 2005 Openedhand Ltd. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/moduleparam.h> 21 #include <linux/kernel.h> 22 #include <linux/clk.h> 23 #include <linux/timer.h> 24 #include <linux/interrupt.h> 25 #include <linux/platform_device.h> 26 #include <linux/i2c.h> 27 #include <linux/of.h> 28 29 #include <linux/atmel-ssc.h> 30 31 #include <sound/core.h> 32 #include <sound/pcm.h> 33 #include <sound/pcm_params.h> 34 #include <sound/soc.h> 35 36 #include "../codecs/wm8731.h" 37 #include "atmel-pcm.h" 38 #include "atmel_ssc_dai.h" 39 40 #define MCLK_RATE 12000000 41 42 /* 43 * As shipped the board does not have inputs. However, it is relatively 44 * straightforward to modify the board to hook them up so support is left 45 * in the driver. 46 */ 47 #undef ENABLE_MIC_INPUT 48 49 static struct clk *mclk; 50 51 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 52 struct snd_soc_dapm_context *dapm, 53 enum snd_soc_bias_level level) 54 { 55 static int mclk_on; 56 int ret = 0; 57 58 switch (level) { 59 case SND_SOC_BIAS_ON: 60 case SND_SOC_BIAS_PREPARE: 61 if (!mclk_on) 62 ret = clk_enable(mclk); 63 if (ret == 0) 64 mclk_on = 1; 65 break; 66 67 case SND_SOC_BIAS_OFF: 68 case SND_SOC_BIAS_STANDBY: 69 if (mclk_on) 70 clk_disable(mclk); 71 mclk_on = 0; 72 break; 73 } 74 75 return ret; 76 } 77 78 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 79 SND_SOC_DAPM_MIC("Int Mic", NULL), 80 SND_SOC_DAPM_SPK("Ext Spk", NULL), 81 }; 82 83 static const struct snd_soc_dapm_route intercon[] = { 84 85 /* speaker connected to LHPOUT/RHPOUT */ 86 {"Ext Spk", NULL, "LHPOUT"}, 87 {"Ext Spk", NULL, "RHPOUT"}, 88 89 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 90 {"MICIN", NULL, "Mic Bias"}, 91 {"Mic Bias", NULL, "Int Mic"}, 92 }; 93 94 /* 95 * Logic for a wm8731 as connected on a at91sam9g20ek board. 96 */ 97 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 98 { 99 struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); 100 struct device *dev = rtd->dev; 101 int ret; 102 103 dev_dbg(dev, "%s called\n", __func__); 104 105 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 106 MCLK_RATE, SND_SOC_CLOCK_IN); 107 if (ret < 0) { 108 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret); 109 return ret; 110 } 111 112 #ifndef ENABLE_MIC_INPUT 113 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); 114 #endif 115 116 return 0; 117 } 118 119 SND_SOC_DAILINK_DEFS(pcm, 120 DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")), 121 DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")), 122 DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0"))); 123 124 static struct snd_soc_dai_link at91sam9g20ek_dai = { 125 .name = "WM8731", 126 .stream_name = "WM8731 PCM", 127 .init = at91sam9g20ek_wm8731_init, 128 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 129 SND_SOC_DAIFMT_CBP_CFP, 130 SND_SOC_DAILINK_REG(pcm), 131 }; 132 133 static struct snd_soc_card snd_soc_at91sam9g20ek = { 134 .name = "AT91SAMG20-EK", 135 .owner = THIS_MODULE, 136 .dai_link = &at91sam9g20ek_dai, 137 .num_links = 1, 138 .set_bias_level = at91sam9g20ek_set_bias_level, 139 140 .dapm_widgets = at91sam9g20ek_dapm_widgets, 141 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), 142 .dapm_routes = intercon, 143 .num_dapm_routes = ARRAY_SIZE(intercon), 144 .fully_routed = true, 145 }; 146 147 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 148 { 149 struct device_node *np = pdev->dev.of_node; 150 struct device_node *codec_np, *cpu_np; 151 struct clk *pllb; 152 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 153 int ret; 154 155 if (!np) { 156 return -ENODEV; 157 } 158 159 ret = atmel_ssc_set_audio(0); 160 if (ret) { 161 dev_err(&pdev->dev, "ssc channel is not valid\n"); 162 return -EINVAL; 163 } 164 165 /* 166 * Codec MCLK is supplied by PCK0 - set it up. 167 */ 168 mclk = clk_get(NULL, "pck0"); 169 if (IS_ERR(mclk)) { 170 dev_err(&pdev->dev, "Failed to get MCLK\n"); 171 ret = PTR_ERR(mclk); 172 goto err; 173 } 174 175 pllb = clk_get(NULL, "pllb"); 176 if (IS_ERR(pllb)) { 177 dev_err(&pdev->dev, "Failed to get PLLB\n"); 178 ret = PTR_ERR(pllb); 179 goto err_mclk; 180 } 181 ret = clk_set_parent(mclk, pllb); 182 clk_put(pllb); 183 if (ret != 0) { 184 dev_err(&pdev->dev, "Failed to set MCLK parent\n"); 185 goto err_mclk; 186 } 187 188 clk_set_rate(mclk, MCLK_RATE); 189 190 card->dev = &pdev->dev; 191 192 /* Parse device node info */ 193 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 194 if (ret) 195 goto err; 196 197 ret = snd_soc_of_parse_audio_routing(card, 198 "atmel,audio-routing"); 199 if (ret) 200 goto err; 201 202 /* Parse codec info */ 203 at91sam9g20ek_dai.codecs->name = NULL; 204 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 205 if (!codec_np) { 206 dev_err(&pdev->dev, "codec info missing\n"); 207 return -EINVAL; 208 } 209 at91sam9g20ek_dai.codecs->of_node = codec_np; 210 211 /* Parse dai and platform info */ 212 at91sam9g20ek_dai.cpus->dai_name = NULL; 213 at91sam9g20ek_dai.platforms->name = NULL; 214 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 215 if (!cpu_np) { 216 dev_err(&pdev->dev, "dai and pcm info missing\n"); 217 of_node_put(codec_np); 218 return -EINVAL; 219 } 220 at91sam9g20ek_dai.cpus->of_node = cpu_np; 221 at91sam9g20ek_dai.platforms->of_node = cpu_np; 222 223 of_node_put(codec_np); 224 of_node_put(cpu_np); 225 226 ret = snd_soc_register_card(card); 227 if (ret) { 228 dev_err(&pdev->dev, "snd_soc_register_card() failed\n"); 229 } 230 231 return ret; 232 233 err_mclk: 234 clk_put(mclk); 235 mclk = NULL; 236 err: 237 atmel_ssc_put_audio(0); 238 return ret; 239 } 240 241 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 242 { 243 struct snd_soc_card *card = platform_get_drvdata(pdev); 244 245 clk_disable(mclk); 246 mclk = NULL; 247 snd_soc_unregister_card(card); 248 atmel_ssc_put_audio(0); 249 250 return 0; 251 } 252 253 #ifdef CONFIG_OF 254 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 255 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 256 { } 257 }; 258 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 259 #endif 260 261 static struct platform_driver at91sam9g20ek_audio_driver = { 262 .driver = { 263 .name = "at91sam9g20ek-audio", 264 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 265 }, 266 .probe = at91sam9g20ek_audio_probe, 267 .remove = at91sam9g20ek_audio_remove, 268 }; 269 270 module_platform_driver(at91sam9g20ek_audio_driver); 271 272 /* Module information */ 273 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 274 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 275 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 276 MODULE_LICENSE("GPL"); 277