Commit | Line | Data |
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1cd2224c MR |
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 | /* generate tone */ | |
41 | snd_hda_codec_write_cache(codec, beep->nid, 0, | |
42 | AC_VERB_SET_BEEP_CONTROL, beep->tone); | |
43 | } | |
44 | ||
45 | static int snd_hda_beep_event(struct input_dev *dev, unsigned int type, | |
46 | unsigned int code, int hz) | |
47 | { | |
48 | struct hda_beep *beep = input_get_drvdata(dev); | |
49 | ||
50 | switch (code) { | |
51 | case SND_BELL: | |
52 | if (hz) | |
53 | hz = 1000; | |
54 | case SND_TONE: | |
55 | hz *= 1000; /* fixed point */ | |
56 | hz = hz - DIGBEEP_HZ_MIN; | |
57 | if (hz < 0) | |
58 | hz = 0; /* turn off PC beep*/ | |
59 | else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN)) | |
60 | hz = 0xff; | |
61 | else { | |
62 | hz /= DIGBEEP_HZ_STEP; | |
63 | hz++; | |
64 | } | |
65 | break; | |
66 | default: | |
67 | return -1; | |
68 | } | |
69 | beep->tone = hz; | |
70 | ||
71 | /* schedule beep event */ | |
72 | schedule_work(&beep->beep_work); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) | |
77 | { | |
78 | struct input_dev *input_dev; | |
79 | struct hda_beep *beep; | |
80 | int err; | |
81 | ||
82 | beep = kzalloc(sizeof(*beep), GFP_KERNEL); | |
83 | if (beep == NULL) | |
84 | return -ENOMEM; | |
85 | snprintf(beep->phys, sizeof(beep->phys), | |
86 | "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr); | |
87 | input_dev = input_allocate_device(); | |
88 | ||
89 | /* setup digital beep device */ | |
90 | input_dev->name = "HDA Digital PCBeep"; | |
91 | input_dev->phys = beep->phys; | |
92 | input_dev->id.bustype = BUS_PCI; | |
93 | ||
94 | input_dev->id.vendor = codec->vendor_id >> 16; | |
95 | input_dev->id.product = codec->vendor_id & 0xffff; | |
96 | input_dev->id.version = 0x01; | |
97 | ||
98 | input_dev->evbit[0] = BIT_MASK(EV_SND); | |
99 | input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); | |
100 | input_dev->event = snd_hda_beep_event; | |
101 | input_dev->dev.parent = &codec->bus->pci->dev; | |
102 | input_set_drvdata(input_dev, beep); | |
103 | ||
104 | err = input_register_device(input_dev); | |
105 | if (err < 0) { | |
106 | kfree(input_dev); | |
107 | kfree(beep); | |
108 | return err; | |
109 | } | |
110 | ||
111 | /* enable linear scale */ | |
112 | snd_hda_codec_write(codec, nid, 0, | |
113 | AC_VERB_SET_DIGI_CONVERT_2, 0x01); | |
114 | ||
115 | beep->nid = nid; | |
116 | beep->dev = input_dev; | |
117 | beep->codec = codec; | |
118 | codec->beep = beep; | |
119 | ||
120 | INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | void snd_hda_detach_beep_device(struct hda_codec *codec) | |
125 | { | |
126 | struct hda_beep *beep = codec->beep; | |
127 | if (beep) { | |
128 | cancel_work_sync(&beep->beep_work); | |
129 | flush_scheduled_work(); | |
130 | ||
131 | input_unregister_device(beep->dev); | |
132 | kfree(beep); | |
133 | } | |
134 | } |