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beep.c
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1 /*
2  * Beep using pcm
3  *
4  * Copyright (c) by Takashi Iwai <[email protected]>
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 
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 
32 struct pmac_beep {
33  int running; /* boolean */
34  int volume; /* mixer volume: 0-100 */
35  int volume_play; /* currently playing volume */
36  int hz;
37  int nsamples;
38  short *buf; /* allocated wave buffer */
39  dma_addr_t addr; /* physical address of buffer */
40  struct input_dev *dev;
41 };
42 
43 /*
44  * stop beep if running
45  */
46 void snd_pmac_beep_stop(struct snd_pmac *chip)
47 {
48  struct pmac_beep *beep = chip->beep;
49  if (beep && beep->running) {
50  beep->running = 0;
51  snd_pmac_beep_dma_stop(chip);
52  }
53 }
54 
55 /*
56  * Stuff for outputting a beep. The values range from -327 to +327
57  * so we can multiply by an amplitude in the range 0..100 to get a
58  * signed short value to put in the output buffer.
59  */
60 static short beep_wform[256] = {
61  0, 40, 79, 117, 153, 187, 218, 245,
62  269, 288, 304, 316, 323, 327, 327, 324,
63  318, 310, 299, 288, 275, 262, 249, 236,
64  224, 213, 204, 196, 190, 186, 183, 182,
65  182, 183, 186, 189, 192, 196, 200, 203,
66  206, 208, 209, 209, 209, 207, 204, 201,
67  197, 193, 188, 183, 179, 174, 170, 166,
68  163, 161, 160, 159, 159, 160, 161, 162,
69  164, 166, 168, 169, 171, 171, 171, 170,
70  169, 167, 163, 159, 155, 150, 144, 139,
71  133, 128, 122, 117, 113, 110, 107, 105,
72  103, 103, 103, 103, 104, 104, 105, 105,
73  105, 103, 101, 97, 92, 86, 78, 68,
74  58, 45, 32, 18, 3, -11, -26, -41,
75  -55, -68, -79, -88, -95, -100, -102, -102,
76  -99, -93, -85, -75, -62, -48, -33, -16,
77  0, 16, 33, 48, 62, 75, 85, 93,
78  99, 102, 102, 100, 95, 88, 79, 68,
79  55, 41, 26, 11, -3, -18, -32, -45,
80  -58, -68, -78, -86, -92, -97, -101, -103,
81  -105, -105, -105, -104, -104, -103, -103, -103,
82  -103, -105, -107, -110, -113, -117, -122, -128,
83  -133, -139, -144, -150, -155, -159, -163, -167,
84  -169, -170, -171, -171, -171, -169, -168, -166,
85  -164, -162, -161, -160, -159, -159, -160, -161,
86  -163, -166, -170, -174, -179, -183, -188, -193,
87  -197, -201, -204, -207, -209, -209, -209, -208,
88  -206, -203, -200, -196, -192, -189, -186, -183,
89  -182, -182, -183, -186, -190, -196, -204, -213,
90  -224, -236, -249, -262, -275, -288, -299, -310,
91  -318, -324, -327, -327, -323, -316, -304, -288,
92  -269, -245, -218, -187, -153, -117, -79, -40,
93 };
94 
95 #define BEEP_SRATE 22050 /* 22050 Hz sample rate */
96 #define BEEP_BUFLEN 512
97 #define BEEP_VOLUME 15 /* 0 - 100 */
98 
99 static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,
100  unsigned int code, int hz)
101 {
102  struct snd_pmac *chip;
103  struct pmac_beep *beep;
104  unsigned long flags;
105  int beep_speed = 0;
106  int srate;
107  int period, ncycles, nsamples;
108  int i, j, f;
109  short *p;
110 
111  if (type != EV_SND)
112  return -1;
113 
114  switch (code) {
115  case SND_BELL: if (hz) hz = 1000;
116  case SND_TONE: break;
117  default: return -1;
118  }
119 
120  chip = input_get_drvdata(dev);
121  if (! chip || (beep = chip->beep) == NULL)
122  return -1;
123 
124  if (! hz) {
125  spin_lock_irqsave(&chip->reg_lock, flags);
126  if (beep->running)
127  snd_pmac_beep_stop(chip);
128  spin_unlock_irqrestore(&chip->reg_lock, flags);
129  return 0;
130  }
131 
132  beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
133  srate = chip->freq_table[beep_speed];
134 
135  if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
136  hz = 1000;
137 
138  spin_lock_irqsave(&chip->reg_lock, flags);
139  if (chip->playback.running || chip->capture.running || beep->running) {
140  spin_unlock_irqrestore(&chip->reg_lock, flags);
141  return 0;
142  }
143  beep->running = 1;
144  spin_unlock_irqrestore(&chip->reg_lock, flags);
145 
146  if (hz == beep->hz && beep->volume == beep->volume_play) {
147  nsamples = beep->nsamples;
148  } else {
149  period = srate * 256 / hz; /* fixed point */
150  ncycles = BEEP_BUFLEN * 256 / period;
151  nsamples = (period * ncycles) >> 8;
152  f = ncycles * 65536 / nsamples;
153  j = 0;
154  p = beep->buf;
155  for (i = 0; i < nsamples; ++i, p += 2) {
156  p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
157  j = (j + f) & 0xffff;
158  }
159  beep->hz = hz;
160  beep->volume_play = beep->volume;
161  beep->nsamples = nsamples;
162  }
163 
164  spin_lock_irqsave(&chip->reg_lock, flags);
165  snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
166  spin_unlock_irqrestore(&chip->reg_lock, flags);
167  return 0;
168 }
169 
170 /*
171  * beep volume mixer
172  */
173 
174 static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
175  struct snd_ctl_elem_info *uinfo)
176 {
177  uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
178  uinfo->count = 1;
179  uinfo->value.integer.min = 0;
180  uinfo->value.integer.max = 100;
181  return 0;
182 }
183 
184 static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,
185  struct snd_ctl_elem_value *ucontrol)
186 {
187  struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
188  if (snd_BUG_ON(!chip->beep))
189  return -ENXIO;
190  ucontrol->value.integer.value[0] = chip->beep->volume;
191  return 0;
192 }
193 
194 static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
195  struct snd_ctl_elem_value *ucontrol)
196 {
197  struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
198  unsigned int oval, nval;
199  if (snd_BUG_ON(!chip->beep))
200  return -ENXIO;
201  oval = chip->beep->volume;
202  nval = ucontrol->value.integer.value[0];
203  if (nval > 100)
204  return -EINVAL;
205  chip->beep->volume = nval;
206  return oval != chip->beep->volume;
207 }
208 
209 static struct snd_kcontrol_new snd_pmac_beep_mixer = {
210  .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
211  .name = "Beep Playback Volume",
212  .info = snd_pmac_info_beep,
213  .get = snd_pmac_get_beep,
214  .put = snd_pmac_put_beep,
215 };
216 
217 /* Initialize beep stuff */
218 int __devinit snd_pmac_attach_beep(struct snd_pmac *chip)
219 {
220  struct pmac_beep *beep;
221  struct input_dev *input_dev;
222  struct snd_kcontrol *beep_ctl;
223  void *dmabuf;
224  int err = -ENOMEM;
225 
226  beep = kzalloc(sizeof(*beep), GFP_KERNEL);
227  if (! beep)
228  return -ENOMEM;
229  dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
230  &beep->addr, GFP_KERNEL);
231  input_dev = input_allocate_device();
232  if (! dmabuf || ! input_dev)
233  goto fail1;
234 
235  /* FIXME: set more better values */
236  input_dev->name = "PowerMac Beep";
237  input_dev->phys = "powermac/beep";
238  input_dev->id.bustype = BUS_ADB;
239  input_dev->id.vendor = 0x001f;
240  input_dev->id.product = 0x0001;
241  input_dev->id.version = 0x0100;
242 
243  input_dev->evbit[0] = BIT_MASK(EV_SND);
244  input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
245  input_dev->event = snd_pmac_beep_event;
246  input_dev->dev.parent = &chip->pdev->dev;
247  input_set_drvdata(input_dev, chip);
248 
249  beep->dev = input_dev;
250  beep->buf = dmabuf;
251  beep->volume = BEEP_VOLUME;
252  beep->running = 0;
253 
254  beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
255  err = snd_ctl_add(chip->card, beep_ctl);
256  if (err < 0)
257  goto fail1;
258 
259  chip->beep = beep;
260 
261  err = input_register_device(beep->dev);
262  if (err)
263  goto fail2;
264 
265  return 0;
266 
267  fail2: snd_ctl_remove(chip->card, beep_ctl);
268  fail1: input_free_device(input_dev);
269  if (dmabuf)
270  dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
271  dmabuf, beep->addr);
272  kfree(beep);
273  return err;
274 }
275 
276 void snd_pmac_detach_beep(struct snd_pmac *chip)
277 {
278  if (chip->beep) {
279  input_unregister_device(chip->beep->dev);
280  dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
281  chip->beep->buf, chip->beep->addr);
282  kfree(chip->beep);
283  chip->beep = NULL;
284  }
285 }
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