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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
21#include <sound/driver.h>
22#include <asm/io.h>
23#include <asm/irq.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/input.h>
Benjamin Herrenschmidt7bbd8272005-04-16 15:24:32 -070027#include <linux/pci.h>
28#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <sound/core.h>
30#include <sound/control.h>
31#include "pmac.h"
32
33struct snd_pmac_beep {
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -050034 int running; /* boolean */
35 int volume; /* mixer volume: 0-100 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 int volume_play; /* currently playing volume */
37 int hz;
38 int nsamples;
39 short *buf; /* allocated wave buffer */
Benjamin Herrenschmidt7bbd8272005-04-16 15:24:32 -070040 dma_addr_t addr; /* physical address of buffer */
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -050041 struct input_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042};
43
44/*
45 * stop beep if running
46 */
47void snd_pmac_beep_stop(pmac_t *chip)
48{
49 pmac_beep_t *beep = chip->beep;
50 if (beep && beep->running) {
51 beep->running = 0;
52 snd_pmac_beep_dma_stop(chip);
53 }
54}
55
56/*
57 * Stuff for outputting a beep. The values range from -327 to +327
58 * so we can multiply by an amplitude in the range 0..100 to get a
59 * signed short value to put in the output buffer.
60 */
61static short beep_wform[256] = {
62 0, 40, 79, 117, 153, 187, 218, 245,
63 269, 288, 304, 316, 323, 327, 327, 324,
64 318, 310, 299, 288, 275, 262, 249, 236,
65 224, 213, 204, 196, 190, 186, 183, 182,
66 182, 183, 186, 189, 192, 196, 200, 203,
67 206, 208, 209, 209, 209, 207, 204, 201,
68 197, 193, 188, 183, 179, 174, 170, 166,
69 163, 161, 160, 159, 159, 160, 161, 162,
70 164, 166, 168, 169, 171, 171, 171, 170,
71 169, 167, 163, 159, 155, 150, 144, 139,
72 133, 128, 122, 117, 113, 110, 107, 105,
73 103, 103, 103, 103, 104, 104, 105, 105,
74 105, 103, 101, 97, 92, 86, 78, 68,
75 58, 45, 32, 18, 3, -11, -26, -41,
76 -55, -68, -79, -88, -95, -100, -102, -102,
77 -99, -93, -85, -75, -62, -48, -33, -16,
78 0, 16, 33, 48, 62, 75, 85, 93,
79 99, 102, 102, 100, 95, 88, 79, 68,
80 55, 41, 26, 11, -3, -18, -32, -45,
81 -58, -68, -78, -86, -92, -97, -101, -103,
82 -105, -105, -105, -104, -104, -103, -103, -103,
83 -103, -105, -107, -110, -113, -117, -122, -128,
84 -133, -139, -144, -150, -155, -159, -163, -167,
85 -169, -170, -171, -171, -171, -169, -168, -166,
86 -164, -162, -161, -160, -159, -159, -160, -161,
87 -163, -166, -170, -174, -179, -183, -188, -193,
88 -197, -201, -204, -207, -209, -209, -209, -208,
89 -206, -203, -200, -196, -192, -189, -186, -183,
90 -182, -182, -183, -186, -190, -196, -204, -213,
91 -224, -236, -249, -262, -275, -288, -299, -310,
92 -318, -324, -327, -327, -323, -316, -304, -288,
93 -269, -245, -218, -187, -153, -117, -79, -40,
94};
95
96#define BEEP_SRATE 22050 /* 22050 Hz sample rate */
97#define BEEP_BUFLEN 512
98#define BEEP_VOLUME 15 /* 0 - 100 */
99
100static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type, unsigned int code, int hz)
101{
102 pmac_t *chip;
103 pmac_beep_t *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 = dev->private;
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#define chip_t pmac_t
175
176static int snd_pmac_info_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
177{
178 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
179 uinfo->count = 1;
180 uinfo->value.integer.min = 0;
181 uinfo->value.integer.max = 100;
182 return 0;
183}
184
185static int snd_pmac_get_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
186{
187 pmac_t *chip = snd_kcontrol_chip(kcontrol);
188 snd_assert(chip->beep, return -ENXIO);
189 ucontrol->value.integer.value[0] = chip->beep->volume;
190 return 0;
191}
192
193static int snd_pmac_put_beep(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
194{
195 pmac_t *chip = snd_kcontrol_chip(kcontrol);
196 int oval;
197 snd_assert(chip->beep, return -ENXIO);
198 oval = chip->beep->volume;
199 chip->beep->volume = ucontrol->value.integer.value[0];
200 return oval != chip->beep->volume;
201}
202
203static snd_kcontrol_new_t snd_pmac_beep_mixer = {
204 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
205 .name = "Beep Playback Volume",
206 .info = snd_pmac_info_beep,
207 .get = snd_pmac_get_beep,
208 .put = snd_pmac_put_beep,
209};
210
211/* Initialize beep stuff */
212int __init snd_pmac_attach_beep(pmac_t *chip)
213{
214 pmac_beep_t *beep;
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500215 struct input_dev *input_dev;
216 void *dmabuf;
217 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500219 beep = kzalloc(sizeof(*beep), GFP_KERNEL);
220 dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
221 &beep->addr, GFP_KERNEL);
222 input_dev = input_allocate_device();
223 if (!beep || !dmabuf || !input_dev)
224 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 /* FIXME: set more better values */
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500227 input_dev->name = "PowerMac Beep";
228 input_dev->phys = "powermac/beep";
229 input_dev->id.bustype = BUS_ADB;
230 input_dev->id.vendor = 0x001f;
231 input_dev->id.product = 0x0001;
232 input_dev->id.version = 0x0100;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500234 input_dev->evbit[0] = BIT(EV_SND);
235 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
236 input_dev->event = snd_pmac_beep_event;
237 input_dev->private = chip;
238 input_dev->cdev.dev = &chip->pdev->dev;
239
240 beep->dev = input_dev;
241 beep->buf = dmabuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 beep->volume = BEEP_VOLUME;
243 beep->running = 0;
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500244
245 err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip));
246 if (err < 0)
247 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 chip->beep = beep;
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500250 input_register_device(beep->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 return 0;
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500253
254 fail: input_free_device(input_dev);
255 kfree(dmabuf);
256 kfree(beep);
257 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
260void snd_pmac_detach_beep(pmac_t *chip)
261{
262 if (chip->beep) {
Dmitry Torokhov5ebdcbc2005-09-15 02:01:49 -0500263 input_unregister_device(chip->beep->dev);
Benjamin Herrenschmidt7bbd8272005-04-16 15:24:32 -0700264 dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
265 chip->beep->buf, chip->beep->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 kfree(chip->beep);
267 chip->beep = NULL;
268 }
269}