beep.c 7.7 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281
  1. /*
  2. * Beep using pcm
  3. *
  4. * Copyright (c) by Takashi Iwai <tiwai@suse.de>
  5. *
  6. * This program is free software; you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation; either version 2 of the License, or
  9. * (at your option) any later version.
  10. *
  11. * This program is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License
  17. * along with this program; if not, write to the Free Software
  18. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19. */
  20. #include <sound/driver.h>
  21. #include <asm/io.h>
  22. #include <asm/irq.h>
  23. #include <linux/init.h>
  24. #include <linux/slab.h>
  25. #include <linux/input.h>
  26. #include <linux/pci.h>
  27. #include <linux/dma-mapping.h>
  28. #include <sound/core.h>
  29. #include <sound/control.h>
  30. #include "pmac.h"
  31. struct pmac_beep {
  32. int running; /* boolean */
  33. int volume; /* mixer volume: 0-100 */
  34. int volume_play; /* currently playing volume */
  35. int hz;
  36. int nsamples;
  37. short *buf; /* allocated wave buffer */
  38. dma_addr_t addr; /* physical address of buffer */
  39. struct input_dev *dev;
  40. };
  41. /*
  42. * stop beep if running
  43. */
  44. void snd_pmac_beep_stop(struct snd_pmac *chip)
  45. {
  46. struct pmac_beep *beep = chip->beep;
  47. if (beep && beep->running) {
  48. beep->running = 0;
  49. snd_pmac_beep_dma_stop(chip);
  50. }
  51. }
  52. /*
  53. * Stuff for outputting a beep. The values range from -327 to +327
  54. * so we can multiply by an amplitude in the range 0..100 to get a
  55. * signed short value to put in the output buffer.
  56. */
  57. static short beep_wform[256] = {
  58. 0, 40, 79, 117, 153, 187, 218, 245,
  59. 269, 288, 304, 316, 323, 327, 327, 324,
  60. 318, 310, 299, 288, 275, 262, 249, 236,
  61. 224, 213, 204, 196, 190, 186, 183, 182,
  62. 182, 183, 186, 189, 192, 196, 200, 203,
  63. 206, 208, 209, 209, 209, 207, 204, 201,
  64. 197, 193, 188, 183, 179, 174, 170, 166,
  65. 163, 161, 160, 159, 159, 160, 161, 162,
  66. 164, 166, 168, 169, 171, 171, 171, 170,
  67. 169, 167, 163, 159, 155, 150, 144, 139,
  68. 133, 128, 122, 117, 113, 110, 107, 105,
  69. 103, 103, 103, 103, 104, 104, 105, 105,
  70. 105, 103, 101, 97, 92, 86, 78, 68,
  71. 58, 45, 32, 18, 3, -11, -26, -41,
  72. -55, -68, -79, -88, -95, -100, -102, -102,
  73. -99, -93, -85, -75, -62, -48, -33, -16,
  74. 0, 16, 33, 48, 62, 75, 85, 93,
  75. 99, 102, 102, 100, 95, 88, 79, 68,
  76. 55, 41, 26, 11, -3, -18, -32, -45,
  77. -58, -68, -78, -86, -92, -97, -101, -103,
  78. -105, -105, -105, -104, -104, -103, -103, -103,
  79. -103, -105, -107, -110, -113, -117, -122, -128,
  80. -133, -139, -144, -150, -155, -159, -163, -167,
  81. -169, -170, -171, -171, -171, -169, -168, -166,
  82. -164, -162, -161, -160, -159, -159, -160, -161,
  83. -163, -166, -170, -174, -179, -183, -188, -193,
  84. -197, -201, -204, -207, -209, -209, -209, -208,
  85. -206, -203, -200, -196, -192, -189, -186, -183,
  86. -182, -182, -183, -186, -190, -196, -204, -213,
  87. -224, -236, -249, -262, -275, -288, -299, -310,
  88. -318, -324, -327, -327, -323, -316, -304, -288,
  89. -269, -245, -218, -187, -153, -117, -79, -40,
  90. };
  91. #define BEEP_SRATE 22050 /* 22050 Hz sample rate */
  92. #define BEEP_BUFLEN 512
  93. #define BEEP_VOLUME 15 /* 0 - 100 */
  94. static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,
  95. unsigned int code, int hz)
  96. {
  97. struct snd_pmac *chip;
  98. struct pmac_beep *beep;
  99. unsigned long flags;
  100. int beep_speed = 0;
  101. int srate;
  102. int period, ncycles, nsamples;
  103. int i, j, f;
  104. short *p;
  105. if (type != EV_SND)
  106. return -1;
  107. switch (code) {
  108. case SND_BELL: if (hz) hz = 1000;
  109. case SND_TONE: break;
  110. default: return -1;
  111. }
  112. chip = dev->private;
  113. if (! chip || (beep = chip->beep) == NULL)
  114. return -1;
  115. if (! hz) {
  116. spin_lock_irqsave(&chip->reg_lock, flags);
  117. if (beep->running)
  118. snd_pmac_beep_stop(chip);
  119. spin_unlock_irqrestore(&chip->reg_lock, flags);
  120. return 0;
  121. }
  122. beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
  123. srate = chip->freq_table[beep_speed];
  124. if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
  125. hz = 1000;
  126. spin_lock_irqsave(&chip->reg_lock, flags);
  127. if (chip->playback.running || chip->capture.running || beep->running) {
  128. spin_unlock_irqrestore(&chip->reg_lock, flags);
  129. return 0;
  130. }
  131. beep->running = 1;
  132. spin_unlock_irqrestore(&chip->reg_lock, flags);
  133. if (hz == beep->hz && beep->volume == beep->volume_play) {
  134. nsamples = beep->nsamples;
  135. } else {
  136. period = srate * 256 / hz; /* fixed point */
  137. ncycles = BEEP_BUFLEN * 256 / period;
  138. nsamples = (period * ncycles) >> 8;
  139. f = ncycles * 65536 / nsamples;
  140. j = 0;
  141. p = beep->buf;
  142. for (i = 0; i < nsamples; ++i, p += 2) {
  143. p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
  144. j = (j + f) & 0xffff;
  145. }
  146. beep->hz = hz;
  147. beep->volume_play = beep->volume;
  148. beep->nsamples = nsamples;
  149. }
  150. spin_lock_irqsave(&chip->reg_lock, flags);
  151. snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
  152. spin_unlock_irqrestore(&chip->reg_lock, flags);
  153. return 0;
  154. }
  155. /*
  156. * beep volume mixer
  157. */
  158. static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
  159. struct snd_ctl_elem_info *uinfo)
  160. {
  161. uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  162. uinfo->count = 1;
  163. uinfo->value.integer.min = 0;
  164. uinfo->value.integer.max = 100;
  165. return 0;
  166. }
  167. static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,
  168. struct snd_ctl_elem_value *ucontrol)
  169. {
  170. struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
  171. snd_assert(chip->beep, return -ENXIO);
  172. ucontrol->value.integer.value[0] = chip->beep->volume;
  173. return 0;
  174. }
  175. static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
  176. struct snd_ctl_elem_value *ucontrol)
  177. {
  178. struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
  179. int oval;
  180. snd_assert(chip->beep, return -ENXIO);
  181. oval = chip->beep->volume;
  182. chip->beep->volume = ucontrol->value.integer.value[0];
  183. return oval != chip->beep->volume;
  184. }
  185. static struct snd_kcontrol_new snd_pmac_beep_mixer = {
  186. .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  187. .name = "Beep Playback Volume",
  188. .info = snd_pmac_info_beep,
  189. .get = snd_pmac_get_beep,
  190. .put = snd_pmac_put_beep,
  191. };
  192. /* Initialize beep stuff */
  193. int __init snd_pmac_attach_beep(struct snd_pmac *chip)
  194. {
  195. struct pmac_beep *beep;
  196. struct input_dev *input_dev;
  197. struct snd_kcontrol *beep_ctl;
  198. void *dmabuf;
  199. int err = -ENOMEM;
  200. beep = kzalloc(sizeof(*beep), GFP_KERNEL);
  201. if (! beep)
  202. return -ENOMEM;
  203. dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
  204. &beep->addr, GFP_KERNEL);
  205. input_dev = input_allocate_device();
  206. if (! dmabuf || ! input_dev)
  207. goto fail1;
  208. /* FIXME: set more better values */
  209. input_dev->name = "PowerMac Beep";
  210. input_dev->phys = "powermac/beep";
  211. input_dev->id.bustype = BUS_ADB;
  212. input_dev->id.vendor = 0x001f;
  213. input_dev->id.product = 0x0001;
  214. input_dev->id.version = 0x0100;
  215. input_dev->evbit[0] = BIT(EV_SND);
  216. input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  217. input_dev->event = snd_pmac_beep_event;
  218. input_dev->private = chip;
  219. input_dev->cdev.dev = &chip->pdev->dev;
  220. beep->dev = input_dev;
  221. beep->buf = dmabuf;
  222. beep->volume = BEEP_VOLUME;
  223. beep->running = 0;
  224. beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
  225. err = snd_ctl_add(chip->card, beep_ctl);
  226. if (err < 0)
  227. goto fail1;
  228. chip->beep = beep;
  229. err = input_register_device(beep->dev);
  230. if (err)
  231. goto fail2;
  232. return 0;
  233. fail2: snd_ctl_remove(chip->card, beep_ctl);
  234. fail1: input_free_device(input_dev);
  235. if (dmabuf)
  236. dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
  237. dmabuf, beep->addr);
  238. kfree(beep);
  239. return err;
  240. }
  241. void snd_pmac_detach_beep(struct snd_pmac *chip)
  242. {
  243. if (chip->beep) {
  244. input_unregister_device(chip->beep->dev);
  245. dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
  246. chip->beep->buf, chip->beep->addr);
  247. kfree(chip->beep);
  248. chip->beep = NULL;
  249. }
  250. }