1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright (c) 2018-2020, Intel Corporation 3 // 4 // sof-wm8804.c - ASoC machine driver for Up and Up2 board 5 // based on WM8804/Hifiberry Digi+ 6 7 8 #include <linux/acpi.h> 9 #include <linux/dmi.h> 10 #include <linux/gpio/consumer.h> 11 #include <linux/gpio/machine.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/slab.h> 15 #include <sound/pcm.h> 16 #include <sound/pcm_params.h> 17 #include <sound/soc.h> 18 #include <sound/soc-acpi.h> 19 #include "../../codecs/wm8804.h" 20 21 struct sof_card_private { 22 struct gpio_desc *gpio_44; 23 struct gpio_desc *gpio_48; 24 int sample_rate; 25 }; 26 27 #define SOF_WM8804_UP2_QUIRK BIT(0) 28 29 static unsigned long sof_wm8804_quirk; 30 31 static int sof_wm8804_quirk_cb(const struct dmi_system_id *id) 32 { 33 sof_wm8804_quirk = (unsigned long)id->driver_data; 34 return 1; 35 } 36 37 static const struct dmi_system_id sof_wm8804_quirk_table[] = { 38 { 39 .callback = sof_wm8804_quirk_cb, 40 .matches = { 41 DMI_MATCH(DMI_SYS_VENDOR, "AAEON"), 42 DMI_MATCH(DMI_PRODUCT_NAME, "UP-APL01"), 43 }, 44 .driver_data = (void *)SOF_WM8804_UP2_QUIRK, 45 }, 46 {} 47 }; 48 49 static int sof_wm8804_hw_params(struct snd_pcm_substream *substream, 50 struct snd_pcm_hw_params *params) 51 { 52 struct snd_soc_pcm_runtime *rtd = substream->private_data; 53 struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card); 54 struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); 55 struct snd_soc_component *codec = codec_dai->component; 56 const int sysclk = 27000000; /* This is fixed on this board */ 57 int samplerate; 58 long mclk_freq; 59 int mclk_div; 60 int sampling_freq; 61 bool clk_44; 62 int ret; 63 64 samplerate = params_rate(params); 65 if (samplerate == ctx->sample_rate) 66 return 0; 67 68 ctx->sample_rate = 0; 69 70 if (samplerate <= 96000) { 71 mclk_freq = samplerate * 256; 72 mclk_div = WM8804_MCLKDIV_256FS; 73 } else { 74 mclk_freq = samplerate * 128; 75 mclk_div = WM8804_MCLKDIV_128FS; 76 } 77 78 switch (samplerate) { 79 case 32000: 80 sampling_freq = 0x03; 81 break; 82 case 44100: 83 sampling_freq = 0x00; 84 break; 85 case 48000: 86 sampling_freq = 0x02; 87 break; 88 case 88200: 89 sampling_freq = 0x08; 90 break; 91 case 96000: 92 sampling_freq = 0x0a; 93 break; 94 case 176400: 95 sampling_freq = 0x0c; 96 break; 97 case 192000: 98 sampling_freq = 0x0e; 99 break; 100 default: 101 dev_err(rtd->card->dev, 102 "unsupported samplerate %d\n", samplerate); 103 return -EINVAL; 104 } 105 106 if (samplerate % 16000) 107 clk_44 = true; /* use 44.1 kHz root frequency */ 108 else 109 clk_44 = false; 110 111 if (!(IS_ERR_OR_NULL(ctx->gpio_44) || 112 IS_ERR_OR_NULL(ctx->gpio_48))) { 113 /* 114 * ensure both GPIOs are LOW first, then drive the 115 * relevant one to HIGH 116 */ 117 if (clk_44) { 118 gpiod_set_value_cansleep(ctx->gpio_48, !clk_44); 119 gpiod_set_value_cansleep(ctx->gpio_44, clk_44); 120 } else { 121 gpiod_set_value_cansleep(ctx->gpio_44, clk_44); 122 gpiod_set_value_cansleep(ctx->gpio_48, !clk_44); 123 } 124 } 125 126 snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div); 127 snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq); 128 129 ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL, 130 sysclk, SND_SOC_CLOCK_OUT); 131 if (ret < 0) { 132 dev_err(rtd->card->dev, 133 "Failed to set WM8804 SYSCLK: %d\n", ret); 134 return ret; 135 } 136 137 /* set sampling frequency status bits */ 138 snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f, 139 sampling_freq); 140 141 ctx->sample_rate = samplerate; 142 143 return 0; 144 } 145 146 /* machine stream operations */ 147 static struct snd_soc_ops sof_wm8804_ops = { 148 .hw_params = sof_wm8804_hw_params, 149 }; 150 151 SND_SOC_DAILINK_DEF(ssp5_pin, 152 DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin"))); 153 154 SND_SOC_DAILINK_DEF(ssp5_codec, 155 DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif"))); 156 157 SND_SOC_DAILINK_DEF(platform, 158 DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0"))); 159 160 static struct snd_soc_dai_link dailink[] = { 161 /* back ends */ 162 { 163 .name = "SSP5-Codec", 164 .id = 0, 165 .no_pcm = 1, 166 .nonatomic = true, 167 .dpcm_playback = 1, 168 .dpcm_capture = 1, 169 .ops = &sof_wm8804_ops, 170 SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform), 171 }, 172 }; 173 174 /* SoC card */ 175 static struct snd_soc_card sof_wm8804_card = { 176 .name = "wm8804", /* sof- prefix added automatically */ 177 .owner = THIS_MODULE, 178 .dai_link = dailink, 179 .num_links = ARRAY_SIZE(dailink), 180 }; 181 182 /* i2c-<HID>:00 with HID being 8 chars */ 183 static char codec_name[SND_ACPI_I2C_ID_LEN]; 184 185 /* 186 * to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to 187 * select the clock source. On the Up2 board, this means 188 * Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404. 189 * 190 * Using the ACPI device name is not very nice, but since we only use 191 * the value for the Up2 board there is no risk of conflict with other 192 * platforms. 193 */ 194 195 static struct gpiod_lookup_table up2_gpios_table = { 196 /* .dev_id is set during probe */ 197 .table = { 198 GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH), 199 GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH), 200 { }, 201 }, 202 }; 203 204 static int sof_wm8804_probe(struct platform_device *pdev) 205 { 206 struct snd_soc_card *card; 207 struct snd_soc_acpi_mach *mach; 208 struct sof_card_private *ctx; 209 struct acpi_device *adev; 210 int dai_index = 0; 211 int ret; 212 int i; 213 214 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 215 if (!ctx) 216 return -ENOMEM; 217 218 mach = pdev->dev.platform_data; 219 card = &sof_wm8804_card; 220 card->dev = &pdev->dev; 221 222 dmi_check_system(sof_wm8804_quirk_table); 223 224 if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) { 225 up2_gpios_table.dev_id = dev_name(&pdev->dev); 226 gpiod_add_lookup_table(&up2_gpios_table); 227 228 /* 229 * The gpios are required for specific boards with 230 * local oscillators, and optional in other cases. 231 * Since we can't identify when they are needed, use 232 * the GPIO as non-optional 233 */ 234 235 ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5", 236 GPIOD_OUT_LOW); 237 if (IS_ERR(ctx->gpio_44)) { 238 ret = PTR_ERR(ctx->gpio_44); 239 dev_err(&pdev->dev, 240 "could not get BCM-GPIO5: %d\n", 241 ret); 242 return ret; 243 } 244 245 ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6", 246 GPIOD_OUT_LOW); 247 if (IS_ERR(ctx->gpio_48)) { 248 ret = PTR_ERR(ctx->gpio_48); 249 dev_err(&pdev->dev, 250 "could not get BCM-GPIO6: %d\n", 251 ret); 252 return ret; 253 } 254 } 255 256 /* fix index of codec dai */ 257 for (i = 0; i < ARRAY_SIZE(dailink); i++) { 258 if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) { 259 dai_index = i; 260 break; 261 } 262 } 263 264 /* fixup codec name based on HID */ 265 adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1); 266 if (adev) { 267 snprintf(codec_name, sizeof(codec_name), 268 "%s%s", "i2c-", acpi_dev_name(adev)); 269 put_device(&adev->dev); 270 dailink[dai_index].codecs->name = codec_name; 271 } 272 273 snd_soc_card_set_drvdata(card, ctx); 274 275 return devm_snd_soc_register_card(&pdev->dev, card); 276 } 277 278 static int sof_wm8804_remove(struct platform_device *pdev) 279 { 280 if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) 281 gpiod_remove_lookup_table(&up2_gpios_table); 282 return 0; 283 } 284 285 static struct platform_driver sof_wm8804_driver = { 286 .driver = { 287 .name = "sof-wm8804", 288 .pm = &snd_soc_pm_ops, 289 }, 290 .probe = sof_wm8804_probe, 291 .remove = sof_wm8804_remove, 292 }; 293 module_platform_driver(sof_wm8804_driver); 294 295 MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver"); 296 MODULE_AUTHOR("Pierre-Louis Bossart"); 297 MODULE_LICENSE("GPL v2"); 298 MODULE_ALIAS("platform:sof-wm8804"); 299