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Linux/sound/pci/cs5535audio/cs5535audio.c

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  1 /*
  2  * Driver for audio on multifunction CS5535/6 companion device
  3  * Copyright (C) Jaya Kumar
  4  *
  5  * Based on Jaroslav Kysela and Takashi Iwai's examples.
  6  * This work was sponsored by CIS(M) Sdn Bhd.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  */
 23 
 24 #include <linux/delay.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/init.h>
 27 #include <linux/pci.h>
 28 #include <linux/slab.h>
 29 #include <linux/module.h>
 30 #include <asm/io.h>
 31 #include <sound/core.h>
 32 #include <sound/control.h>
 33 #include <sound/pcm.h>
 34 #include <sound/rawmidi.h>
 35 #include <sound/ac97_codec.h>
 36 #include <sound/initval.h>
 37 #include <sound/asoundef.h>
 38 #include "cs5535audio.h"
 39 
 40 #define DRIVER_NAME "cs5535audio"
 41 
 42 static char *ac97_quirk;
 43 module_param(ac97_quirk, charp, 0444);
 44 MODULE_PARM_DESC(ac97_quirk, "AC'97 board specific workarounds.");
 45 
 46 static struct ac97_quirk ac97_quirks[] = {
 47 #if 0 /* Not yet confirmed if all 5536 boards are HP only */
 48         {
 49                 .subvendor = PCI_VENDOR_ID_AMD, 
 50                 .subdevice = PCI_DEVICE_ID_AMD_CS5536_AUDIO, 
 51                 .name = "AMD RDK",     
 52                 .type = AC97_TUNE_HP_ONLY
 53         },
 54 #endif
 55         {}
 56 };
 57 
 58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 59 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 60 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 61 
 62 module_param_array(index, int, NULL, 0444);
 63 MODULE_PARM_DESC(index, "Index value for " DRIVER_NAME);
 64 module_param_array(id, charp, NULL, 0444);
 65 MODULE_PARM_DESC(id, "ID string for " DRIVER_NAME);
 66 module_param_array(enable, bool, NULL, 0444);
 67 MODULE_PARM_DESC(enable, "Enable " DRIVER_NAME);
 68 
 69 static DEFINE_PCI_DEVICE_TABLE(snd_cs5535audio_ids) = {
 70         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_AUDIO) },
 71         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO) },
 72         {}
 73 };
 74 
 75 MODULE_DEVICE_TABLE(pci, snd_cs5535audio_ids);
 76 
 77 static void wait_till_cmd_acked(struct cs5535audio *cs5535au, unsigned long timeout)
 78 {
 79         unsigned int tmp;
 80         do {
 81                 tmp = cs_readl(cs5535au, ACC_CODEC_CNTL);
 82                 if (!(tmp & CMD_NEW))
 83                         break;
 84                 udelay(1);
 85         } while (--timeout);
 86         if (!timeout)
 87                 snd_printk(KERN_ERR "Failure writing to cs5535 codec\n");
 88 }
 89 
 90 static unsigned short snd_cs5535audio_codec_read(struct cs5535audio *cs5535au,
 91                                                  unsigned short reg)
 92 {
 93         unsigned int regdata;
 94         unsigned int timeout;
 95         unsigned int val;
 96 
 97         regdata = ((unsigned int) reg) << 24;
 98         regdata |= ACC_CODEC_CNTL_RD_CMD;
 99         regdata |= CMD_NEW;
100 
101         cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
102         wait_till_cmd_acked(cs5535au, 50);
103 
104         timeout = 50;
105         do {
106                 val = cs_readl(cs5535au, ACC_CODEC_STATUS);
107                 if ((val & STS_NEW) && reg == (val >> 24))
108                         break;
109                 udelay(1);
110         } while (--timeout);
111         if (!timeout)
112                 snd_printk(KERN_ERR "Failure reading codec reg 0x%x,"
113                                         "Last value=0x%x\n", reg, val);
114 
115         return (unsigned short) val;
116 }
117 
118 static void snd_cs5535audio_codec_write(struct cs5535audio *cs5535au,
119                                         unsigned short reg, unsigned short val)
120 {
121         unsigned int regdata;
122 
123         regdata = ((unsigned int) reg) << 24;
124         regdata |= val;
125         regdata &= CMD_MASK;
126         regdata |= CMD_NEW;
127         regdata &= ACC_CODEC_CNTL_WR_CMD;
128 
129         cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
130         wait_till_cmd_acked(cs5535au, 50);
131 }
132 
133 static void snd_cs5535audio_ac97_codec_write(struct snd_ac97 *ac97,
134                                              unsigned short reg, unsigned short val)
135 {
136         struct cs5535audio *cs5535au = ac97->private_data;
137         snd_cs5535audio_codec_write(cs5535au, reg, val);
138 }
139 
140 static unsigned short snd_cs5535audio_ac97_codec_read(struct snd_ac97 *ac97,
141                                                       unsigned short reg)
142 {
143         struct cs5535audio *cs5535au = ac97->private_data;
144         return snd_cs5535audio_codec_read(cs5535au, reg);
145 }
146 
147 static int snd_cs5535audio_mixer(struct cs5535audio *cs5535au)
148 {
149         struct snd_card *card = cs5535au->card;
150         struct snd_ac97_bus *pbus;
151         struct snd_ac97_template ac97;
152         int err;
153         static struct snd_ac97_bus_ops ops = {
154                 .write = snd_cs5535audio_ac97_codec_write,
155                 .read = snd_cs5535audio_ac97_codec_read,
156         };
157 
158         if ((err = snd_ac97_bus(card, 0, &ops, NULL, &pbus)) < 0)
159                 return err;
160 
161         memset(&ac97, 0, sizeof(ac97));
162         ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM
163                         | AC97_SCAP_POWER_SAVE;
164         ac97.private_data = cs5535au;
165         ac97.pci = cs5535au->pci;
166 
167         /* set any OLPC-specific scaps */
168         olpc_prequirks(card, &ac97);
169 
170         if ((err = snd_ac97_mixer(pbus, &ac97, &cs5535au->ac97)) < 0) {
171                 snd_printk(KERN_ERR "mixer failed\n");
172                 return err;
173         }
174 
175         snd_ac97_tune_hardware(cs5535au->ac97, ac97_quirks, ac97_quirk);
176 
177         err = olpc_quirks(card, cs5535au->ac97);
178         if (err < 0) {
179                 snd_printk(KERN_ERR "olpc quirks failed\n");
180                 return err;
181         }
182 
183         return 0;
184 }
185 
186 static void process_bm0_irq(struct cs5535audio *cs5535au)
187 {
188         u8 bm_stat;
189         spin_lock(&cs5535au->reg_lock);
190         bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS);
191         spin_unlock(&cs5535au->reg_lock);
192         if (bm_stat & EOP) {
193                 struct cs5535audio_dma *dma;
194                 dma = cs5535au->playback_substream->runtime->private_data;
195                 snd_pcm_period_elapsed(cs5535au->playback_substream);
196         } else {
197                 snd_printk(KERN_ERR "unexpected bm0 irq src, bm_stat=%x\n",
198                                         bm_stat);
199         }
200 }
201 
202 static void process_bm1_irq(struct cs5535audio *cs5535au)
203 {
204         u8 bm_stat;
205         spin_lock(&cs5535au->reg_lock);
206         bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS);
207         spin_unlock(&cs5535au->reg_lock);
208         if (bm_stat & EOP) {
209                 struct cs5535audio_dma *dma;
210                 dma = cs5535au->capture_substream->runtime->private_data;
211                 snd_pcm_period_elapsed(cs5535au->capture_substream);
212         }
213 }
214 
215 static irqreturn_t snd_cs5535audio_interrupt(int irq, void *dev_id)
216 {
217         u16 acc_irq_stat;
218         unsigned char count;
219         struct cs5535audio *cs5535au = dev_id;
220 
221         if (cs5535au == NULL)
222                 return IRQ_NONE;
223 
224         acc_irq_stat = cs_readw(cs5535au, ACC_IRQ_STATUS);
225 
226         if (!acc_irq_stat)
227                 return IRQ_NONE;
228         for (count = 0; count < 4; count++) {
229                 if (acc_irq_stat & (1 << count)) {
230                         switch (count) {
231                         case IRQ_STS:
232                                 cs_readl(cs5535au, ACC_GPIO_STATUS);
233                                 break;
234                         case WU_IRQ_STS:
235                                 cs_readl(cs5535au, ACC_GPIO_STATUS);
236                                 break;
237                         case BM0_IRQ_STS:
238                                 process_bm0_irq(cs5535au);
239                                 break;
240                         case BM1_IRQ_STS:
241                                 process_bm1_irq(cs5535au);
242                                 break;
243                         default:
244                                 snd_printk(KERN_ERR "Unexpected irq src: "
245                                                 "0x%x\n", acc_irq_stat);
246                                 break;
247                         }
248                 }
249         }
250         return IRQ_HANDLED;
251 }
252 
253 static int snd_cs5535audio_free(struct cs5535audio *cs5535au)
254 {
255         synchronize_irq(cs5535au->irq);
256         pci_set_power_state(cs5535au->pci, 3);
257 
258         if (cs5535au->irq >= 0)
259                 free_irq(cs5535au->irq, cs5535au);
260 
261         pci_release_regions(cs5535au->pci);
262         pci_disable_device(cs5535au->pci);
263         kfree(cs5535au);
264         return 0;
265 }
266 
267 static int snd_cs5535audio_dev_free(struct snd_device *device)
268 {
269         struct cs5535audio *cs5535au = device->device_data;
270         return snd_cs5535audio_free(cs5535au);
271 }
272 
273 static int snd_cs5535audio_create(struct snd_card *card,
274                                   struct pci_dev *pci,
275                                   struct cs5535audio **rcs5535au)
276 {
277         struct cs5535audio *cs5535au;
278 
279         int err;
280         static struct snd_device_ops ops = {
281                 .dev_free =     snd_cs5535audio_dev_free,
282         };
283 
284         *rcs5535au = NULL;
285         if ((err = pci_enable_device(pci)) < 0)
286                 return err;
287 
288         if (pci_set_dma_mask(pci, DMA_BIT_MASK(32)) < 0 ||
289             pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)) < 0) {
290                 printk(KERN_WARNING "unable to get 32bit dma\n");
291                 err = -ENXIO;
292                 goto pcifail;
293         }
294 
295         cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL);
296         if (cs5535au == NULL) {
297                 err = -ENOMEM;
298                 goto pcifail;
299         }
300 
301         spin_lock_init(&cs5535au->reg_lock);
302         cs5535au->card = card;
303         cs5535au->pci = pci;
304         cs5535au->irq = -1;
305 
306         if ((err = pci_request_regions(pci, "CS5535 Audio")) < 0) {
307                 kfree(cs5535au);
308                 goto pcifail;
309         }
310 
311         cs5535au->port = pci_resource_start(pci, 0);
312 
313         if (request_irq(pci->irq, snd_cs5535audio_interrupt,
314                         IRQF_SHARED, KBUILD_MODNAME, cs5535au)) {
315                 snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
316                 err = -EBUSY;
317                 goto sndfail;
318         }
319 
320         cs5535au->irq = pci->irq;
321         pci_set_master(pci);
322 
323         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
324                                   cs5535au, &ops)) < 0)
325                 goto sndfail;
326 
327         snd_card_set_dev(card, &pci->dev);
328 
329         *rcs5535au = cs5535au;
330         return 0;
331 
332 sndfail: /* leave the device alive, just kill the snd */
333         snd_cs5535audio_free(cs5535au);
334         return err;
335 
336 pcifail:
337         pci_disable_device(pci);
338         return err;
339 }
340 
341 static int snd_cs5535audio_probe(struct pci_dev *pci,
342                                  const struct pci_device_id *pci_id)
343 {
344         static int dev;
345         struct snd_card *card;
346         struct cs5535audio *cs5535au;
347         int err;
348 
349         if (dev >= SNDRV_CARDS)
350                 return -ENODEV;
351         if (!enable[dev]) {
352                 dev++;
353                 return -ENOENT;
354         }
355 
356         err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
357         if (err < 0)
358                 return err;
359 
360         if ((err = snd_cs5535audio_create(card, pci, &cs5535au)) < 0)
361                 goto probefail_out;
362 
363         card->private_data = cs5535au;
364 
365         if ((err = snd_cs5535audio_mixer(cs5535au)) < 0)
366                 goto probefail_out;
367 
368         if ((err = snd_cs5535audio_pcm(cs5535au)) < 0)
369                 goto probefail_out;
370 
371         strcpy(card->driver, DRIVER_NAME);
372 
373         strcpy(card->shortname, "CS5535 Audio");
374         sprintf(card->longname, "%s %s at 0x%lx, irq %i",
375                 card->shortname, card->driver,
376                 cs5535au->port, cs5535au->irq);
377 
378         if ((err = snd_card_register(card)) < 0)
379                 goto probefail_out;
380 
381         pci_set_drvdata(pci, card);
382         dev++;
383         return 0;
384 
385 probefail_out:
386         snd_card_free(card);
387         return err;
388 }
389 
390 static void snd_cs5535audio_remove(struct pci_dev *pci)
391 {
392         olpc_quirks_cleanup();
393         snd_card_free(pci_get_drvdata(pci));
394         pci_set_drvdata(pci, NULL);
395 }
396 
397 static struct pci_driver cs5535audio_driver = {
398         .name = KBUILD_MODNAME,
399         .id_table = snd_cs5535audio_ids,
400         .probe = snd_cs5535audio_probe,
401         .remove = snd_cs5535audio_remove,
402 #ifdef CONFIG_PM_SLEEP
403         .driver = {
404                 .pm = &snd_cs5535audio_pm,
405         },
406 #endif
407 };
408 
409 module_pci_driver(cs5535audio_driver);
410 
411 MODULE_AUTHOR("Jaya Kumar");
412 MODULE_LICENSE("GPL");
413 MODULE_DESCRIPTION("CS5535 Audio");
414 MODULE_SUPPORTED_DEVICE("CS5535 Audio");
415 

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