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 | ||
4d4e9bb3 TI |
40 | if (!beep->enabled) |
41 | return; | |
42 | ||
1cd2224c MR |
43 | /* generate tone */ |
44 | snd_hda_codec_write_cache(codec, beep->nid, 0, | |
45 | AC_VERB_SET_BEEP_CONTROL, beep->tone); | |
46 | } | |
47 | ||
fa797966 TI |
48 | /* (non-standard) Linear beep tone calculation for IDT/STAC codecs |
49 | * | |
50 | * The tone frequency of beep generator on IDT/STAC codecs is | |
51 | * defined from the 8bit tone parameter, in Hz, | |
52 | * freq = 48000 * (257 - tone) / 1024 | |
53 | * that is from 12kHz to 93.75kHz in step of 46.875 hz | |
54 | */ | |
55 | static int beep_linear_tone(struct hda_beep *beep, int hz) | |
56 | { | |
57 | hz *= 1000; /* fixed point */ | |
58 | hz = hz - DIGBEEP_HZ_MIN; | |
59 | if (hz < 0) | |
60 | hz = 0; /* turn off PC beep*/ | |
61 | else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN)) | |
62 | hz = 0xff; | |
63 | else { | |
64 | hz /= DIGBEEP_HZ_STEP; | |
65 | hz++; | |
66 | } | |
67 | return hz; | |
68 | } | |
69 | ||
70 | /* HD-audio standard beep tone parameter calculation | |
71 | * | |
72 | * The tone frequency in Hz is calculated as | |
73 | * freq = 48000 / (tone * 4) | |
74 | * from 47Hz to 12kHz | |
75 | */ | |
76 | static int beep_standard_tone(struct hda_beep *beep, int hz) | |
77 | { | |
78 | if (hz <= 0) | |
79 | return 0; /* disabled */ | |
80 | hz = 12000 / hz; | |
81 | if (hz > 0xff) | |
82 | return 0xff; | |
83 | if (hz <= 0) | |
84 | return 1; | |
85 | return hz; | |
86 | } | |
87 | ||
1cd2224c MR |
88 | static int snd_hda_beep_event(struct input_dev *dev, unsigned int type, |
89 | unsigned int code, int hz) | |
90 | { | |
91 | struct hda_beep *beep = input_get_drvdata(dev); | |
92 | ||
93 | switch (code) { | |
94 | case SND_BELL: | |
95 | if (hz) | |
96 | hz = 1000; | |
97 | case SND_TONE: | |
fa797966 TI |
98 | if (beep->linear_tone) |
99 | beep->tone = beep_linear_tone(beep, hz); | |
100 | else | |
101 | beep->tone = beep_standard_tone(beep, hz); | |
1cd2224c MR |
102 | break; |
103 | default: | |
104 | return -1; | |
105 | } | |
1cd2224c MR |
106 | |
107 | /* schedule beep event */ | |
108 | schedule_work(&beep->beep_work); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) | |
113 | { | |
114 | struct input_dev *input_dev; | |
115 | struct hda_beep *beep; | |
116 | int err; | |
117 | ||
118 | beep = kzalloc(sizeof(*beep), GFP_KERNEL); | |
119 | if (beep == NULL) | |
120 | return -ENOMEM; | |
121 | snprintf(beep->phys, sizeof(beep->phys), | |
122 | "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr); | |
123 | input_dev = input_allocate_device(); | |
6a12afb5 TI |
124 | if (!input_dev) { |
125 | kfree(beep); | |
126 | return -ENOMEM; | |
127 | } | |
1cd2224c MR |
128 | |
129 | /* setup digital beep device */ | |
130 | input_dev->name = "HDA Digital PCBeep"; | |
131 | input_dev->phys = beep->phys; | |
132 | input_dev->id.bustype = BUS_PCI; | |
133 | ||
134 | input_dev->id.vendor = codec->vendor_id >> 16; | |
135 | input_dev->id.product = codec->vendor_id & 0xffff; | |
136 | input_dev->id.version = 0x01; | |
137 | ||
138 | input_dev->evbit[0] = BIT_MASK(EV_SND); | |
139 | input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); | |
140 | input_dev->event = snd_hda_beep_event; | |
141 | input_dev->dev.parent = &codec->bus->pci->dev; | |
142 | input_set_drvdata(input_dev, beep); | |
143 | ||
144 | err = input_register_device(input_dev); | |
145 | if (err < 0) { | |
f6154d6d | 146 | input_free_device(input_dev); |
1cd2224c MR |
147 | kfree(beep); |
148 | return err; | |
149 | } | |
150 | ||
151 | /* enable linear scale */ | |
152 | snd_hda_codec_write(codec, nid, 0, | |
153 | AC_VERB_SET_DIGI_CONVERT_2, 0x01); | |
154 | ||
155 | beep->nid = nid; | |
156 | beep->dev = input_dev; | |
157 | beep->codec = codec; | |
4d4e9bb3 | 158 | beep->enabled = 1; |
1cd2224c MR |
159 | codec->beep = beep; |
160 | ||
161 | INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); | |
162 | return 0; | |
163 | } | |
ff7a3267 | 164 | EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device); |
1cd2224c MR |
165 | |
166 | void snd_hda_detach_beep_device(struct hda_codec *codec) | |
167 | { | |
168 | struct hda_beep *beep = codec->beep; | |
169 | if (beep) { | |
170 | cancel_work_sync(&beep->beep_work); | |
1cd2224c MR |
171 | |
172 | input_unregister_device(beep->dev); | |
173 | kfree(beep); | |
c44765b8 | 174 | codec->beep = NULL; |
1cd2224c MR |
175 | } |
176 | } | |
ff7a3267 | 177 | EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device); |