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Linux/sound/pci/cs5535audio/cs5535audio.c

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  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 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         synchronize_irq(cs5535au->irq);
241         pci_set_power_state(cs5535au->pci, PCI_D3hot);
242 
243         if (cs5535au->irq >= 0)
244                 free_irq(cs5535au->irq, cs5535au);
245 
246         pci_release_regions(cs5535au->pci);
247         pci_disable_device(cs5535au->pci);
248         kfree(cs5535au);
249         return 0;
250 }
251 
252 static int snd_cs5535audio_dev_free(struct snd_device *device)
253 {
254         struct cs5535audio *cs5535au = device->device_data;
255         return snd_cs5535audio_free(cs5535au);
256 }
257 
258 static int snd_cs5535audio_create(struct snd_card *card,
259                                   struct pci_dev *pci,
260                                   struct cs5535audio **rcs5535au)
261 {
262         struct cs5535audio *cs5535au;
263 
264         int err;
265         static struct snd_device_ops ops = {
266                 .dev_free =     snd_cs5535audio_dev_free,
267         };
268 
269         *rcs5535au = NULL;
270         if ((err = pci_enable_device(pci)) < 0)
271                 return err;
272 
273         if (dma_set_mask(&pci->dev, DMA_BIT_MASK(32)) < 0 ||
274             dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32)) < 0) {
275                 dev_warn(card->dev, "unable to get 32bit dma\n");
276                 err = -ENXIO;
277                 goto pcifail;
278         }
279 
280         cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL);
281         if (cs5535au == NULL) {
282                 err = -ENOMEM;
283                 goto pcifail;
284         }
285 
286         spin_lock_init(&cs5535au->reg_lock);
287         cs5535au->card = card;
288         cs5535au->pci = pci;
289         cs5535au->irq = -1;
290 
291         if ((err = pci_request_regions(pci, "CS5535 Audio")) < 0) {
292                 kfree(cs5535au);
293                 goto pcifail;
294         }
295 
296         cs5535au->port = pci_resource_start(pci, 0);
297 
298         if (request_irq(pci->irq, snd_cs5535audio_interrupt,
299                         IRQF_SHARED, KBUILD_MODNAME, cs5535au)) {
300                 dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
301                 err = -EBUSY;
302                 goto sndfail;
303         }
304 
305         cs5535au->irq = pci->irq;
306         pci_set_master(pci);
307 
308         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
309                                   cs5535au, &ops)) < 0)
310                 goto sndfail;
311 
312         *rcs5535au = cs5535au;
313         return 0;
314 
315 sndfail: /* leave the device alive, just kill the snd */
316         snd_cs5535audio_free(cs5535au);
317         return err;
318 
319 pcifail:
320         pci_disable_device(pci);
321         return err;
322 }
323 
324 static int snd_cs5535audio_probe(struct pci_dev *pci,
325                                  const struct pci_device_id *pci_id)
326 {
327         static int dev;
328         struct snd_card *card;
329         struct cs5535audio *cs5535au;
330         int err;
331 
332         if (dev >= SNDRV_CARDS)
333                 return -ENODEV;
334         if (!enable[dev]) {
335                 dev++;
336                 return -ENOENT;
337         }
338 
339         err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
340                            0, &card);
341         if (err < 0)
342                 return err;
343 
344         if ((err = snd_cs5535audio_create(card, pci, &cs5535au)) < 0)
345                 goto probefail_out;
346 
347         card->private_data = cs5535au;
348 
349         if ((err = snd_cs5535audio_mixer(cs5535au)) < 0)
350                 goto probefail_out;
351 
352         if ((err = snd_cs5535audio_pcm(cs5535au)) < 0)
353                 goto probefail_out;
354 
355         strcpy(card->driver, DRIVER_NAME);
356 
357         strcpy(card->shortname, "CS5535 Audio");
358         sprintf(card->longname, "%s %s at 0x%lx, irq %i",
359                 card->shortname, card->driver,
360                 cs5535au->port, cs5535au->irq);
361 
362         if ((err = snd_card_register(card)) < 0)
363                 goto probefail_out;
364 
365         pci_set_drvdata(pci, card);
366         dev++;
367         return 0;
368 
369 probefail_out:
370         snd_card_free(card);
371         return err;
372 }
373 
374 static void snd_cs5535audio_remove(struct pci_dev *pci)
375 {
376         olpc_quirks_cleanup();
377         snd_card_free(pci_get_drvdata(pci));
378 }
379 
380 static struct pci_driver cs5535audio_driver = {
381         .name = KBUILD_MODNAME,
382         .id_table = snd_cs5535audio_ids,
383         .probe = snd_cs5535audio_probe,
384         .remove = snd_cs5535audio_remove,
385 #ifdef CONFIG_PM_SLEEP
386         .driver = {
387                 .pm = &snd_cs5535audio_pm,
388         },
389 #endif
390 };
391 
392 module_pci_driver(cs5535audio_driver);
393 
394 MODULE_AUTHOR("Jaya Kumar");
395 MODULE_LICENSE("GPL");
396 MODULE_DESCRIPTION("CS5535 Audio");
397 MODULE_SUPPORTED_DEVICE("CS5535 Audio");
398 

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