1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for audio on multifunction CS5535/6 companion device 4 * Copyright (C) Jaya Kumar 5 * 6 * Based on Jaroslav Kysela and Takashi Iwai's examples. 7 * This work was sponsored by CIS(M) Sdn Bhd. 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/interrupt.h> 12 #include <linux/init.h> 13 #include <linux/pci.h> 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/io.h> 17 #include <sound/core.h> 18 #include <sound/control.h> 19 #include <sound/pcm.h> 20 #include <sound/rawmidi.h> 21 #include <sound/ac97_codec.h> 22 #include <sound/initval.h> 23 #include <sound/asoundef.h> 24 #include "cs5535audio.h" 25 26 #define DRIVER_NAME "cs5535audio" 27 28 static char *ac97_quirk; 29 module_param(ac97_quirk, charp, 0444); 30 MODULE_PARM_DESC(ac97_quirk, "AC'97 board specific workarounds."); 31 32 static const struct ac97_quirk ac97_quirks[] = { 33 #if 0 /* Not yet confirmed if all 5536 boards are HP only */ 34 { 35 .subvendor = PCI_VENDOR_ID_AMD, 36 .subdevice = PCI_DEVICE_ID_AMD_CS5536_AUDIO, 37 .name = "AMD RDK", 38 .type = AC97_TUNE_HP_ONLY 39 }, 40 #endif 41 {} 42 }; 43 44 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 45 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; 46 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; 47 48 module_param_array(index, int, NULL, 0444); 49 MODULE_PARM_DESC(index, "Index value for " DRIVER_NAME); 50 module_param_array(id, charp, NULL, 0444); 51 MODULE_PARM_DESC(id, "ID string for " DRIVER_NAME); 52 module_param_array(enable, bool, NULL, 0444); 53 MODULE_PARM_DESC(enable, "Enable " DRIVER_NAME); 54 55 static const struct pci_device_id snd_cs5535audio_ids[] = { 56 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_AUDIO) }, 57 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO) }, 58 {} 59 }; 60 61 MODULE_DEVICE_TABLE(pci, snd_cs5535audio_ids); 62 63 static void wait_till_cmd_acked(struct cs5535audio *cs5535au, unsigned long timeout) 64 { 65 unsigned int tmp; 66 do { 67 tmp = cs_readl(cs5535au, ACC_CODEC_CNTL); 68 if (!(tmp & CMD_NEW)) 69 break; 70 udelay(1); 71 } while (--timeout); 72 if (!timeout) 73 dev_err(cs5535au->card->dev, 74 "Failure writing to cs5535 codec\n"); 75 } 76 77 static unsigned short snd_cs5535audio_codec_read(struct cs5535audio *cs5535au, 78 unsigned short reg) 79 { 80 unsigned int regdata; 81 unsigned int timeout; 82 unsigned int val; 83 84 regdata = ((unsigned int) reg) << 24; 85 regdata |= ACC_CODEC_CNTL_RD_CMD; 86 regdata |= CMD_NEW; 87 88 cs_writel(cs5535au, ACC_CODEC_CNTL, regdata); 89 wait_till_cmd_acked(cs5535au, 50); 90 91 timeout = 50; 92 do { 93 val = cs_readl(cs5535au, ACC_CODEC_STATUS); 94 if ((val & STS_NEW) && reg == (val >> 24)) 95 break; 96 udelay(1); 97 } while (--timeout); 98 if (!timeout) 99 dev_err(cs5535au->card->dev, 100 "Failure reading codec reg 0x%x, Last value=0x%x\n", 101 reg, val); 102 103 return (unsigned short) val; 104 } 105 106 static void snd_cs5535audio_codec_write(struct cs5535audio *cs5535au, 107 unsigned short reg, unsigned short val) 108 { 109 unsigned int regdata; 110 111 regdata = ((unsigned int) reg) << 24; 112 regdata |= val; 113 regdata &= CMD_MASK; 114 regdata |= CMD_NEW; 115 regdata &= ACC_CODEC_CNTL_WR_CMD; 116 117 cs_writel(cs5535au, ACC_CODEC_CNTL, regdata); 118 wait_till_cmd_acked(cs5535au, 50); 119 } 120 121 static void snd_cs5535audio_ac97_codec_write(struct snd_ac97 *ac97, 122 unsigned short reg, unsigned short val) 123 { 124 struct cs5535audio *cs5535au = ac97->private_data; 125 snd_cs5535audio_codec_write(cs5535au, reg, val); 126 } 127 128 static unsigned short snd_cs5535audio_ac97_codec_read(struct snd_ac97 *ac97, 129 unsigned short reg) 130 { 131 struct cs5535audio *cs5535au = ac97->private_data; 132 return snd_cs5535audio_codec_read(cs5535au, reg); 133 } 134 135 static int snd_cs5535audio_mixer(struct cs5535audio *cs5535au) 136 { 137 struct snd_card *card = cs5535au->card; 138 struct snd_ac97_bus *pbus; 139 struct snd_ac97_template ac97; 140 int err; 141 static const struct snd_ac97_bus_ops ops = { 142 .write = snd_cs5535audio_ac97_codec_write, 143 .read = snd_cs5535audio_ac97_codec_read, 144 }; 145 146 if ((err = snd_ac97_bus(card, 0, &ops, NULL, &pbus)) < 0) 147 return err; 148 149 memset(&ac97, 0, sizeof(ac97)); 150 ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM 151 | AC97_SCAP_POWER_SAVE; 152 ac97.private_data = cs5535au; 153 ac97.pci = cs5535au->pci; 154 155 /* set any OLPC-specific scaps */ 156 olpc_prequirks(card, &ac97); 157 158 if ((err = snd_ac97_mixer(pbus, &ac97, &cs5535au->ac97)) < 0) { 159 dev_err(card->dev, "mixer failed\n"); 160 return err; 161 } 162 163 snd_ac97_tune_hardware(cs5535au->ac97, ac97_quirks, ac97_quirk); 164 165 err = olpc_quirks(card, cs5535au->ac97); 166 if (err < 0) { 167 dev_err(card->dev, "olpc quirks failed\n"); 168 return err; 169 } 170 171 return 0; 172 } 173 174 static void process_bm0_irq(struct cs5535audio *cs5535au) 175 { 176 u8 bm_stat; 177 spin_lock(&cs5535au->reg_lock); 178 bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS); 179 spin_unlock(&cs5535au->reg_lock); 180 if (bm_stat & EOP) { 181 snd_pcm_period_elapsed(cs5535au->playback_substream); 182 } else { 183 dev_err(cs5535au->card->dev, 184 "unexpected bm0 irq src, bm_stat=%x\n", 185 bm_stat); 186 } 187 } 188 189 static void process_bm1_irq(struct cs5535audio *cs5535au) 190 { 191 u8 bm_stat; 192 spin_lock(&cs5535au->reg_lock); 193 bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS); 194 spin_unlock(&cs5535au->reg_lock); 195 if (bm_stat & EOP) 196 snd_pcm_period_elapsed(cs5535au->capture_substream); 197 } 198 199 static irqreturn_t snd_cs5535audio_interrupt(int irq, void *dev_id) 200 { 201 u16 acc_irq_stat; 202 unsigned char count; 203 struct cs5535audio *cs5535au = dev_id; 204 205 if (cs5535au == NULL) 206 return IRQ_NONE; 207 208 acc_irq_stat = cs_readw(cs5535au, ACC_IRQ_STATUS); 209 210 if (!acc_irq_stat) 211 return IRQ_NONE; 212 for (count = 0; count < 4; count++) { 213 if (acc_irq_stat & (1 << count)) { 214 switch (count) { 215 case IRQ_STS: 216 cs_readl(cs5535au, ACC_GPIO_STATUS); 217 break; 218 case WU_IRQ_STS: 219 cs_readl(cs5535au, ACC_GPIO_STATUS); 220 break; 221 case BM0_IRQ_STS: 222 process_bm0_irq(cs5535au); 223 break; 224 case BM1_IRQ_STS: 225 process_bm1_irq(cs5535au); 226 break; 227 default: 228 dev_err(cs5535au->card->dev, 229 "Unexpected irq src: 0x%x\n", 230 acc_irq_stat); 231 break; 232 } 233 } 234 } 235 return IRQ_HANDLED; 236 } 237 238 static int snd_cs5535audio_free(struct cs5535audio *cs5535au) 239 { 240 pci_set_power_state(cs5535au->pci, PCI_D3hot); 241 242 if (cs5535au->irq >= 0) 243 free_irq(cs5535au->irq, cs5535au); 244 245 pci_release_regions(cs5535au->pci); 246 pci_disable_device(cs5535au->pci); 247 kfree(cs5535au); 248 return 0; 249 } 250 251 static int snd_cs5535audio_dev_free(struct snd_device *device) 252 { 253 struct cs5535audio *cs5535au = device->device_data; 254 return snd_cs5535audio_free(cs5535au); 255 } 256 257 static int snd_cs5535audio_create(struct snd_card *card, 258 struct pci_dev *pci, 259 struct cs5535audio **rcs5535au) 260 { 261 struct cs5535audio *cs5535au; 262 263 int err; 264 static const struct snd_device_ops ops = { 265 .dev_free = snd_cs5535audio_dev_free, 266 }; 267 268 *rcs5535au = NULL; 269 if ((err = pci_enable_device(pci)) < 0) 270 return err; 271 272 if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(32))) { 273 dev_warn(card->dev, "unable to get 32bit dma\n"); 274 err = -ENXIO; 275 goto pcifail; 276 } 277 278 cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL); 279 if (cs5535au == NULL) { 280 err = -ENOMEM; 281 goto pcifail; 282 } 283 284 spin_lock_init(&cs5535au->reg_lock); 285 cs5535au->card = card; 286 cs5535au->pci = pci; 287 cs5535au->irq = -1; 288 289 if ((err = pci_request_regions(pci, "CS5535 Audio")) < 0) { 290 kfree(cs5535au); 291 goto pcifail; 292 } 293 294 cs5535au->port = pci_resource_start(pci, 0); 295 296 if (request_irq(pci->irq, snd_cs5535audio_interrupt, 297 IRQF_SHARED, KBUILD_MODNAME, cs5535au)) { 298 dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq); 299 err = -EBUSY; 300 goto sndfail; 301 } 302 303 cs5535au->irq = pci->irq; 304 card->sync_irq = cs5535au->irq; 305 pci_set_master(pci); 306 307 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, 308 cs5535au, &ops)) < 0) 309 goto sndfail; 310 311 *rcs5535au = cs5535au; 312 return 0; 313 314 sndfail: /* leave the device alive, just kill the snd */ 315 snd_cs5535audio_free(cs5535au); 316 return err; 317 318 pcifail: 319 pci_disable_device(pci); 320 return err; 321 } 322 323 static int snd_cs5535audio_probe(struct pci_dev *pci, 324 const struct pci_device_id *pci_id) 325 { 326 static int dev; 327 struct snd_card *card; 328 struct cs5535audio *cs5535au; 329 int err; 330 331 if (dev >= SNDRV_CARDS) 332 return -ENODEV; 333 if (!enable[dev]) { 334 dev++; 335 return -ENOENT; 336 } 337 338 err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, 339 0, &card); 340 if (err < 0) 341 return err; 342 343 if ((err = snd_cs5535audio_create(card, pci, &cs5535au)) < 0) 344 goto probefail_out; 345 346 card->private_data = cs5535au; 347 348 if ((err = snd_cs5535audio_mixer(cs5535au)) < 0) 349 goto probefail_out; 350 351 if ((err = snd_cs5535audio_pcm(cs5535au)) < 0) 352 goto probefail_out; 353 354 strcpy(card->driver, DRIVER_NAME); 355 356 strcpy(card->shortname, "CS5535 Audio"); 357 sprintf(card->longname, "%s %s at 0x%lx, irq %i", 358 card->shortname, card->driver, 359 cs5535au->port, cs5535au->irq); 360 361 if ((err = snd_card_register(card)) < 0) 362 goto probefail_out; 363 364 pci_set_drvdata(pci, card); 365 dev++; 366 return 0; 367 368 probefail_out: 369 snd_card_free(card); 370 return err; 371 } 372 373 static void snd_cs5535audio_remove(struct pci_dev *pci) 374 { 375 olpc_quirks_cleanup(); 376 snd_card_free(pci_get_drvdata(pci)); 377 } 378 379 static struct pci_driver cs5535audio_driver = { 380 .name = KBUILD_MODNAME, 381 .id_table = snd_cs5535audio_ids, 382 .probe = snd_cs5535audio_probe, 383 .remove = snd_cs5535audio_remove, 384 #ifdef CONFIG_PM_SLEEP 385 .driver = { 386 .pm = &snd_cs5535audio_pm, 387 }, 388 #endif 389 }; 390 391 module_pci_driver(cs5535audio_driver); 392 393 MODULE_AUTHOR("Jaya Kumar"); 394 MODULE_LICENSE("GPL"); 395 MODULE_DESCRIPTION("CS5535 Audio"); 396