Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-nvram
[linux-2.6] / sound / pci / hda / hda_beep.c
1 /*
2  * Digital Beep Input Interface for HD-audio codec
3  *
4  * Author: Matthew Ranostay <mranostay@embeddedalley.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/pci.h>
24 #include <linux/workqueue.h>
25 #include <sound/core.h>
26 #include "hda_beep.h"
27
28 enum {
29         DIGBEEP_HZ_STEP = 46875,        /* 46.875 Hz */
30         DIGBEEP_HZ_MIN = 93750,         /* 93.750 Hz */
31         DIGBEEP_HZ_MAX = 12000000,      /* 12 KHz */
32 };
33
34 static void snd_hda_generate_beep(struct work_struct *work)
35 {
36         struct hda_beep *beep =
37                 container_of(work, struct hda_beep, beep_work);
38         struct hda_codec *codec = beep->codec;
39
40         if (!beep->enabled)
41                 return;
42
43         /* generate tone */
44         snd_hda_codec_write_cache(codec, beep->nid, 0,
45                         AC_VERB_SET_BEEP_CONTROL, beep->tone);
46 }
47
48 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
49                                 unsigned int code, int hz)
50 {
51         struct hda_beep *beep = input_get_drvdata(dev);
52
53         switch (code) {
54         case SND_BELL:
55                 if (hz)
56                         hz = 1000;
57         case SND_TONE:
58                 hz *= 1000; /* fixed point */
59                 hz = hz - DIGBEEP_HZ_MIN;
60                 if (hz < 0)
61                         hz = 0; /* turn off PC beep*/
62                 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
63                         hz = 0xff;
64                 else {
65                         hz /= DIGBEEP_HZ_STEP;
66                         hz++;
67                 }
68                 break;
69         default:
70                 return -1;
71         }
72         beep->tone = hz;
73
74         /* schedule beep event */
75         schedule_work(&beep->beep_work);
76         return 0;
77 }
78
79 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
80 {
81         struct input_dev *input_dev;
82         struct hda_beep *beep;
83         int err;
84
85         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
86         if (beep == NULL)
87                 return -ENOMEM;
88         snprintf(beep->phys, sizeof(beep->phys),
89                 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
90         input_dev = input_allocate_device();
91         if (!input_dev) {
92                 kfree(beep);
93                 return -ENOMEM;
94         }
95
96         /* setup digital beep device */
97         input_dev->name = "HDA Digital PCBeep";
98         input_dev->phys = beep->phys;
99         input_dev->id.bustype = BUS_PCI;
100
101         input_dev->id.vendor = codec->vendor_id >> 16;
102         input_dev->id.product = codec->vendor_id & 0xffff;
103         input_dev->id.version = 0x01;
104
105         input_dev->evbit[0] = BIT_MASK(EV_SND);
106         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
107         input_dev->event = snd_hda_beep_event;
108         input_dev->dev.parent = &codec->bus->pci->dev;
109         input_set_drvdata(input_dev, beep);
110
111         err = input_register_device(input_dev);
112         if (err < 0) {
113                 input_free_device(input_dev);
114                 kfree(beep);
115                 return err;
116         }
117
118         /* enable linear scale */
119         snd_hda_codec_write(codec, nid, 0,
120                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
121
122         beep->nid = nid;
123         beep->dev = input_dev;
124         beep->codec = codec;
125         beep->enabled = 1;
126         codec->beep = beep;
127
128         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
129         return 0;
130 }
131 EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
132
133 void snd_hda_detach_beep_device(struct hda_codec *codec)
134 {
135         struct hda_beep *beep = codec->beep;
136         if (beep) {
137                 cancel_work_sync(&beep->beep_work);
138                 flush_scheduled_work();
139
140                 input_unregister_device(beep->dev);
141                 kfree(beep);
142         }
143 }
144 EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);