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 sof_wm8804_quirk_cb(const struct dmi_system_id * id)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 sof_wm8804_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 = asoc_substream_to_rtd(substream); 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 ret = snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq); 128 if (ret < 0) { 129 dev_err(rtd->card->dev, "Failed to set WM8804 PLL\n"); 130 return ret; 131 } 132 133 ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL, 134 sysclk, SND_SOC_CLOCK_OUT); 135 if (ret < 0) { 136 dev_err(rtd->card->dev, 137 "Failed to set WM8804 SYSCLK: %d\n", ret); 138 return ret; 139 } 140 141 /* set sampling frequency status bits */ 142 snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f, 143 sampling_freq); 144 145 ctx->sample_rate = samplerate; 146 147 return 0; 148 } 149 150 /* machine stream operations */ 151 static struct snd_soc_ops sof_wm8804_ops = { 152 .hw_params = sof_wm8804_hw_params, 153 }; 154 155 SND_SOC_DAILINK_DEF(ssp5_pin, 156 DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin"))); 157 158 SND_SOC_DAILINK_DEF(ssp5_codec, 159 DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif"))); 160 161 SND_SOC_DAILINK_DEF(platform, 162 DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0"))); 163 164 static struct snd_soc_dai_link dailink[] = { 165 /* back ends */ 166 { 167 .name = "SSP5-Codec", 168 .id = 0, 169 .no_pcm = 1, 170 .dpcm_playback = 1, 171 .dpcm_capture = 1, 172 .ops = &sof_wm8804_ops, 173 SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform), 174 }, 175 }; 176 177 /* SoC card */ 178 static struct snd_soc_card sof_wm8804_card = { 179 .name = "wm8804", /* sof- prefix added automatically */ 180 .owner = THIS_MODULE, 181 .dai_link = dailink, 182 .num_links = ARRAY_SIZE(dailink), 183 }; 184 185 /* i2c-<HID>:00 with HID being 8 chars */ 186 static char codec_name[SND_ACPI_I2C_ID_LEN]; 187 188 /* 189 * to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to 190 * select the clock source. On the Up2 board, this means 191 * Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404. 192 * 193 * Using the ACPI device name is not very nice, but since we only use 194 * the value for the Up2 board there is no risk of conflict with other 195 * platforms. 196 */ 197 198 static struct gpiod_lookup_table up2_gpios_table = { 199 /* .dev_id is set during probe */ 200 .table = { 201 GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH), 202 GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH), 203 { }, 204 }, 205 }; 206 sof_wm8804_probe(struct platform_device * pdev)207 static int sof_wm8804_probe(struct platform_device *pdev) 208 { 209 struct snd_soc_card *card; 210 struct snd_soc_acpi_mach *mach; 211 struct sof_card_private *ctx; 212 struct acpi_device *adev; 213 int dai_index = 0; 214 int ret; 215 int i; 216 217 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 218 if (!ctx) 219 return -ENOMEM; 220 221 mach = pdev->dev.platform_data; 222 card = &sof_wm8804_card; 223 card->dev = &pdev->dev; 224 225 dmi_check_system(sof_wm8804_quirk_table); 226 227 if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) { 228 up2_gpios_table.dev_id = dev_name(&pdev->dev); 229 gpiod_add_lookup_table(&up2_gpios_table); 230 231 /* 232 * The gpios are required for specific boards with 233 * local oscillators, and optional in other cases. 234 * Since we can't identify when they are needed, use 235 * the GPIO as non-optional 236 */ 237 238 ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5", 239 GPIOD_OUT_LOW); 240 if (IS_ERR(ctx->gpio_44)) { 241 ret = PTR_ERR(ctx->gpio_44); 242 dev_err(&pdev->dev, 243 "could not get BCM-GPIO5: %d\n", 244 ret); 245 return ret; 246 } 247 248 ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6", 249 GPIOD_OUT_LOW); 250 if (IS_ERR(ctx->gpio_48)) { 251 ret = PTR_ERR(ctx->gpio_48); 252 dev_err(&pdev->dev, 253 "could not get BCM-GPIO6: %d\n", 254 ret); 255 return ret; 256 } 257 } 258 259 /* fix index of codec dai */ 260 for (i = 0; i < ARRAY_SIZE(dailink); i++) { 261 if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) { 262 dai_index = i; 263 break; 264 } 265 } 266 267 /* fixup codec name based on HID */ 268 adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1); 269 if (adev) { 270 snprintf(codec_name, sizeof(codec_name), 271 "%s%s", "i2c-", acpi_dev_name(adev)); 272 dailink[dai_index].codecs->name = codec_name; 273 } 274 acpi_dev_put(adev); 275 276 snd_soc_card_set_drvdata(card, ctx); 277 278 return devm_snd_soc_register_card(&pdev->dev, card); 279 } 280 sof_wm8804_remove(struct platform_device * pdev)281 static void sof_wm8804_remove(struct platform_device *pdev) 282 { 283 if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) 284 gpiod_remove_lookup_table(&up2_gpios_table); 285 } 286 287 static struct platform_driver sof_wm8804_driver = { 288 .driver = { 289 .name = "sof-wm8804", 290 .pm = &snd_soc_pm_ops, 291 }, 292 .probe = sof_wm8804_probe, 293 .remove_new = sof_wm8804_remove, 294 }; 295 module_platform_driver(sof_wm8804_driver); 296 297 MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver"); 298 MODULE_AUTHOR("Pierre-Louis Bossart"); 299 MODULE_LICENSE("GPL v2"); 300 MODULE_ALIAS("platform:sof-wm8804"); 301