block: fix module reference leak on put_disk() call for cgroups throttle
[linux/fpc-iii.git] / sound / pci / hda / hda_beep.c
blobc397e7da0eacf9808d136ccdb8ef40e583e58b19
1 /*
2 * Digital Beep Input Interface for HD-audio codec
4 * Author: Matt Ranostay <mranostay@gmail.com>
5 * Copyright (c) 2008 Embedded Alley Solutions Inc
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.
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.
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
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"
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 */
36 /* generate or stop tone */
37 static void generate_tone(struct hda_beep *beep, int tone)
39 struct hda_codec *codec = beep->codec;
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;
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);
57 static void snd_hda_generate_beep(struct work_struct *work)
59 struct hda_beep *beep =
60 container_of(work, struct hda_beep, beep_work);
62 if (beep->enabled)
63 generate_tone(beep, beep->tone);
66 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
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
73 static int beep_linear_tone(struct hda_beep *beep, int hz)
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;
88 return hz;
91 /* HD-audio standard beep tone parameter calculation
93 * The tone frequency in Hz is calculated as
94 * freq = 48000 / (tone * 4)
95 * from 47Hz to 12kHz
97 static int beep_standard_tone(struct hda_beep *beep, int hz)
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;
109 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
110 unsigned int code, int hz)
112 struct hda_beep *beep = input_get_drvdata(dev);
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;
129 /* schedule beep event */
130 schedule_work(&beep->beep_work);
131 return 0;
134 static void turn_off_beep(struct hda_beep *beep)
136 cancel_work_sync(&beep->beep_work);
137 if (beep->playing) {
138 /* turn off beep */
139 generate_tone(beep, 0);
143 static void snd_hda_do_detach(struct hda_beep *beep)
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);
153 static int snd_hda_do_attach(struct hda_beep *beep)
155 struct input_dev *input_dev;
156 struct hda_codec *codec = beep->codec;
158 input_dev = input_allocate_device();
159 if (!input_dev)
160 return -ENOMEM;
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;
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;
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);
177 beep->dev = input_dev;
178 return 0;
182 * snd_hda_enable_beep_device - Turn on/off beep sound
183 * @codec: the HDA codec
184 * @enable: flag to turn on/off
186 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
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;
198 return 0;
200 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
203 * snd_hda_attach_beep_device - Attach a beep input device
204 * @codec: the HDA codec
205 * @nid: beep NID
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.
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.
214 * Currently, only one beep device is allowed to each codec.
216 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
218 struct hda_beep *beep;
219 int err;
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 */
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);
235 beep->nid = nid;
236 beep->codec = codec;
237 codec->beep = beep;
239 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
240 mutex_init(&beep->mutex);
242 err = snd_hda_do_attach(beep);
243 if (err < 0) {
244 kfree(beep);
245 codec->beep = NULL;
246 return err;
249 return 0;
251 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
254 * snd_hda_detach_beep_device - Detach the beep device
255 * @codec: the HDA codec
257 void snd_hda_detach_beep_device(struct hda_codec *codec)
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);
267 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
270 * snd_hda_register_beep_device - Register the beep device
271 * @codec: the HDA codec
273 int snd_hda_register_beep_device(struct hda_codec *codec)
275 struct hda_beep *beep = codec->beep;
276 int err;
278 if (!beep || !beep->dev)
279 return 0;
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;
289 beep->registered = true;
290 return 0;
292 EXPORT_SYMBOL_GPL(snd_hda_register_beep_device);
294 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
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;
301 /* get/put callbacks for beep mute mixer switches */
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
308 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
309 struct snd_ctl_elem_value *ucontrol)
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;
318 return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
320 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
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
327 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
328 struct snd_ctl_elem_value *ucontrol)
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++;
340 if (chs & 2)
341 enable |= *valp;
342 snd_hda_enable_beep_device(codec, enable);
344 if (!ctl_has_mute(kcontrol))
345 return 0;
346 return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
348 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);