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Linux/sound/pci/hda/hda_beep.c

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  1 /*
  2  * Digital Beep Input Interface for HD-audio codec
  3  *
  4  * Author: Matt Ranostay <mranostay@gmail.com>
  5  * Copyright (c) 2008 Embedded Alley Solutions Inc
  6  *
  7  *  This driver is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License as published by
  9  *  the Free Software Foundation; either version 2 of the License, or
 10  *  (at your option) any later version.
 11  *
 12  *  This driver is distributed in the hope that it will be useful,
 13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *  GNU General Public License for more details.
 16  *
 17  *  You should have received a copy of the GNU General Public License
 18  *  along with this program; if not, write to the Free Software
 19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 20  */
 21 
 22 #include <linux/input.h>
 23 #include <linux/slab.h>
 24 #include <linux/workqueue.h>
 25 #include <linux/export.h>
 26 #include <sound/core.h>
 27 #include "hda_beep.h"
 28 #include "hda_local.h"
 29 
 30 enum {
 31         DIGBEEP_HZ_STEP = 46875,        /* 46.875 Hz */
 32         DIGBEEP_HZ_MIN = 93750,         /* 93.750 Hz */
 33         DIGBEEP_HZ_MAX = 12000000,      /* 12 KHz */
 34 };
 35 
 36 /* generate or stop tone */
 37 static void generate_tone(struct hda_beep *beep, int tone)
 38 {
 39         struct hda_codec *codec = beep->codec;
 40 
 41         if (tone && !beep->playing) {
 42                 snd_hda_power_up(codec);
 43                 if (beep->power_hook)
 44                         beep->power_hook(beep, true);
 45                 beep->playing = 1;
 46         }
 47         snd_hda_codec_write(codec, beep->nid, 0,
 48                             AC_VERB_SET_BEEP_CONTROL, tone);
 49         if (!tone && beep->playing) {
 50                 beep->playing = 0;
 51                 if (beep->power_hook)
 52                         beep->power_hook(beep, false);
 53                 snd_hda_power_down(codec);
 54         }
 55 }
 56 
 57 static void snd_hda_generate_beep(struct work_struct *work)
 58 {
 59         struct hda_beep *beep =
 60                 container_of(work, struct hda_beep, beep_work);
 61 
 62         if (beep->enabled)
 63                 generate_tone(beep, beep->tone);
 64 }
 65 
 66 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs 
 67  *
 68  * The tone frequency of beep generator on IDT/STAC codecs is
 69  * defined from the 8bit tone parameter, in Hz,
 70  *    freq = 48000 * (257 - tone) / 1024
 71  * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
 72  */
 73 static int beep_linear_tone(struct hda_beep *beep, int hz)
 74 {
 75         if (hz <= 0)
 76                 return 0;
 77         hz *= 1000; /* fixed point */
 78         hz = hz - DIGBEEP_HZ_MIN
 79                 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
 80         if (hz < 0)
 81                 hz = 0; /* turn off PC beep*/
 82         else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
 83                 hz = 1; /* max frequency */
 84         else {
 85                 hz /= DIGBEEP_HZ_STEP;
 86                 hz = 255 - hz;
 87         }
 88         return hz;
 89 }
 90 
 91 /* HD-audio standard beep tone parameter calculation
 92  *
 93  * The tone frequency in Hz is calculated as
 94  *   freq = 48000 / (tone * 4)
 95  * from 47Hz to 12kHz
 96  */
 97 static int beep_standard_tone(struct hda_beep *beep, int hz)
 98 {
 99         if (hz <= 0)
100                 return 0; /* disabled */
101         hz = 12000 / hz;
102         if (hz > 0xff)
103                 return 0xff;
104         if (hz <= 0)
105                 return 1;
106         return hz;
107 }
108 
109 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
110                                 unsigned int code, int hz)
111 {
112         struct hda_beep *beep = input_get_drvdata(dev);
113 
114         switch (code) {
115         case SND_BELL:
116                 if (hz)
117                         hz = 1000;
118                 /* fallthru */
119         case SND_TONE:
120                 if (beep->linear_tone)
121                         beep->tone = beep_linear_tone(beep, hz);
122                 else
123                         beep->tone = beep_standard_tone(beep, hz);
124                 break;
125         default:
126                 return -1;
127         }
128 
129         /* schedule beep event */
130         schedule_work(&beep->beep_work);
131         return 0;
132 }
133 
134 static void turn_off_beep(struct hda_beep *beep)
135 {
136         cancel_work_sync(&beep->beep_work);
137         if (beep->playing) {
138                 /* turn off beep */
139                 generate_tone(beep, 0);
140         }
141 }
142 
143 static void snd_hda_do_detach(struct hda_beep *beep)
144 {
145         if (beep->registered)
146                 input_unregister_device(beep->dev);
147         else
148                 input_free_device(beep->dev);
149         beep->dev = NULL;
150         turn_off_beep(beep);
151 }
152 
153 static int snd_hda_do_attach(struct hda_beep *beep)
154 {
155         struct input_dev *input_dev;
156         struct hda_codec *codec = beep->codec;
157 
158         input_dev = input_allocate_device();
159         if (!input_dev)
160                 return -ENOMEM;
161 
162         /* setup digital beep device */
163         input_dev->name = "HDA Digital PCBeep";
164         input_dev->phys = beep->phys;
165         input_dev->id.bustype = BUS_PCI;
166         input_dev->dev.parent = &codec->card->card_dev;
167 
168         input_dev->id.vendor = codec->core.vendor_id >> 16;
169         input_dev->id.product = codec->core.vendor_id & 0xffff;
170         input_dev->id.version = 0x01;
171 
172         input_dev->evbit[0] = BIT_MASK(EV_SND);
173         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
174         input_dev->event = snd_hda_beep_event;
175         input_set_drvdata(input_dev, beep);
176 
177         beep->dev = input_dev;
178         return 0;
179 }
180 
181 /**
182  * snd_hda_enable_beep_device - Turn on/off beep sound
183  * @codec: the HDA codec
184  * @enable: flag to turn on/off
185  */
186 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
187 {
188         struct hda_beep *beep = codec->beep;
189         if (!beep)
190                 return 0;
191         enable = !!enable;
192         if (beep->enabled != enable) {
193                 beep->enabled = enable;
194                 if (!enable)
195                         turn_off_beep(beep);
196                 return 1;
197         }
198         return 0;
199 }
200 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
201 
202 /**
203  * snd_hda_attach_beep_device - Attach a beep input device
204  * @codec: the HDA codec
205  * @nid: beep NID
206  *
207  * Attach a beep object to the given widget.  If beep hint is turned off
208  * explicitly or beep_mode of the codec is turned off, this doesn't nothing.
209  *
210  * The attached beep device has to be registered via
211  * snd_hda_register_beep_device() and released via snd_hda_detach_beep_device()
212  * appropriately.
213  *
214  * Currently, only one beep device is allowed to each codec.
215  */
216 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
217 {
218         struct hda_beep *beep;
219         int err;
220 
221         if (!snd_hda_get_bool_hint(codec, "beep"))
222                 return 0; /* disabled explicitly by hints */
223         if (codec->beep_mode == HDA_BEEP_MODE_OFF)
224                 return 0; /* disabled by module option */
225 
226         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
227         if (beep == NULL)
228                 return -ENOMEM;
229         snprintf(beep->phys, sizeof(beep->phys),
230                 "card%d/codec#%d/beep0", codec->card->number, codec->addr);
231         /* enable linear scale */
232         snd_hda_codec_write_cache(codec, nid, 0,
233                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
234 
235         beep->nid = nid;
236         beep->codec = codec;
237         codec->beep = beep;
238 
239         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
240         mutex_init(&beep->mutex);
241 
242         err = snd_hda_do_attach(beep);
243         if (err < 0) {
244                 kfree(beep);
245                 codec->beep = NULL;
246                 return err;
247         }
248 
249         return 0;
250 }
251 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
252 
253 /**
254  * snd_hda_detach_beep_device - Detach the beep device
255  * @codec: the HDA codec
256  */
257 void snd_hda_detach_beep_device(struct hda_codec *codec)
258 {
259         struct hda_beep *beep = codec->beep;
260         if (beep) {
261                 if (beep->dev)
262                         snd_hda_do_detach(beep);
263                 codec->beep = NULL;
264                 kfree(beep);
265         }
266 }
267 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
268 
269 /**
270  * snd_hda_register_beep_device - Register the beep device
271  * @codec: the HDA codec
272  */
273 int snd_hda_register_beep_device(struct hda_codec *codec)
274 {
275         struct hda_beep *beep = codec->beep;
276         int err;
277 
278         if (!beep || !beep->dev)
279                 return 0;
280 
281         err = input_register_device(beep->dev);
282         if (err < 0) {
283                 codec_err(codec, "hda_beep: unable to register input device\n");
284                 input_free_device(beep->dev);
285                 codec->beep = NULL;
286                 kfree(beep);
287                 return err;
288         }
289         beep->registered = true;
290         return 0;
291 }
292 EXPORT_SYMBOL_GPL(snd_hda_register_beep_device);
293 
294 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
295 {
296         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
297         return query_amp_caps(codec, get_amp_nid(kcontrol),
298                               get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
299 }
300 
301 /* get/put callbacks for beep mute mixer switches */
302 
303 /**
304  * snd_hda_mixer_amp_switch_get_beep - Get callback for beep controls
305  * @kcontrol: ctl element
306  * @ucontrol: pointer to get/store the data
307  */
308 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
309                                       struct snd_ctl_elem_value *ucontrol)
310 {
311         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
312         struct hda_beep *beep = codec->beep;
313         if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
314                 ucontrol->value.integer.value[0] =
315                         ucontrol->value.integer.value[1] = beep->enabled;
316                 return 0;
317         }
318         return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
319 }
320 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
321 
322 /**
323  * snd_hda_mixer_amp_switch_put_beep - Put callback for beep controls
324  * @kcontrol: ctl element
325  * @ucontrol: pointer to get/store the data
326  */
327 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
328                                       struct snd_ctl_elem_value *ucontrol)
329 {
330         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
331         struct hda_beep *beep = codec->beep;
332         if (beep) {
333                 u8 chs = get_amp_channels(kcontrol);
334                 int enable = 0;
335                 long *valp = ucontrol->value.integer.value;
336                 if (chs & 1) {
337                         enable |= *valp;
338                         valp++;
339                 }
340                 if (chs & 2)
341                         enable |= *valp;
342                 snd_hda_enable_beep_device(codec, enable);
343         }
344         if (!ctl_has_mute(kcontrol))
345                 return 0;
346         return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
347 }
348 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);
349 

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