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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" | |
b7b51141 | 27 | #include "hda_local.h" |
1cd2224c MR |
28 | |
29 | enum { | |
30 | DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */ | |
31 | DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */ | |
32 | DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */ | |
33 | }; | |
34 | ||
35 | static void snd_hda_generate_beep(struct work_struct *work) | |
36 | { | |
37 | struct hda_beep *beep = | |
38 | container_of(work, struct hda_beep, beep_work); | |
39 | struct hda_codec *codec = beep->codec; | |
40 | ||
4d4e9bb3 TI |
41 | if (!beep->enabled) |
42 | return; | |
43 | ||
1cd2224c MR |
44 | /* generate tone */ |
45 | snd_hda_codec_write_cache(codec, beep->nid, 0, | |
46 | AC_VERB_SET_BEEP_CONTROL, beep->tone); | |
47 | } | |
48 | ||
fa797966 TI |
49 | /* (non-standard) Linear beep tone calculation for IDT/STAC codecs |
50 | * | |
51 | * The tone frequency of beep generator on IDT/STAC codecs is | |
52 | * defined from the 8bit tone parameter, in Hz, | |
53 | * freq = 48000 * (257 - tone) / 1024 | |
369693dc | 54 | * that is from 12kHz to 93.75Hz in steps of 46.875 Hz |
fa797966 TI |
55 | */ |
56 | static int beep_linear_tone(struct hda_beep *beep, int hz) | |
57 | { | |
369693dc PV |
58 | if (hz <= 0) |
59 | return 0; | |
fa797966 | 60 | hz *= 1000; /* fixed point */ |
369693dc PV |
61 | hz = hz - DIGBEEP_HZ_MIN |
62 | + DIGBEEP_HZ_STEP / 2; /* round to nearest step */ | |
fa797966 TI |
63 | if (hz < 0) |
64 | hz = 0; /* turn off PC beep*/ | |
65 | else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN)) | |
369693dc | 66 | hz = 1; /* max frequency */ |
fa797966 TI |
67 | else { |
68 | hz /= DIGBEEP_HZ_STEP; | |
369693dc | 69 | hz = 255 - hz; |
fa797966 TI |
70 | } |
71 | return hz; | |
72 | } | |
73 | ||
74 | /* HD-audio standard beep tone parameter calculation | |
75 | * | |
76 | * The tone frequency in Hz is calculated as | |
77 | * freq = 48000 / (tone * 4) | |
78 | * from 47Hz to 12kHz | |
79 | */ | |
80 | static int beep_standard_tone(struct hda_beep *beep, int hz) | |
81 | { | |
82 | if (hz <= 0) | |
83 | return 0; /* disabled */ | |
84 | hz = 12000 / hz; | |
85 | if (hz > 0xff) | |
86 | return 0xff; | |
87 | if (hz <= 0) | |
88 | return 1; | |
89 | return hz; | |
90 | } | |
91 | ||
1cd2224c MR |
92 | static int snd_hda_beep_event(struct input_dev *dev, unsigned int type, |
93 | unsigned int code, int hz) | |
94 | { | |
95 | struct hda_beep *beep = input_get_drvdata(dev); | |
96 | ||
97 | switch (code) { | |
98 | case SND_BELL: | |
99 | if (hz) | |
100 | hz = 1000; | |
101 | case SND_TONE: | |
fa797966 TI |
102 | if (beep->linear_tone) |
103 | beep->tone = beep_linear_tone(beep, hz); | |
104 | else | |
105 | beep->tone = beep_standard_tone(beep, hz); | |
1cd2224c MR |
106 | break; |
107 | default: | |
108 | return -1; | |
109 | } | |
1cd2224c MR |
110 | |
111 | /* schedule beep event */ | |
112 | schedule_work(&beep->beep_work); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) | |
117 | { | |
118 | struct input_dev *input_dev; | |
119 | struct hda_beep *beep; | |
120 | int err; | |
121 | ||
b7b51141 TI |
122 | if (!snd_hda_get_bool_hint(codec, "beep")) |
123 | return 0; /* disabled explicitly */ | |
124 | ||
1cd2224c MR |
125 | beep = kzalloc(sizeof(*beep), GFP_KERNEL); |
126 | if (beep == NULL) | |
127 | return -ENOMEM; | |
128 | snprintf(beep->phys, sizeof(beep->phys), | |
129 | "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr); | |
130 | input_dev = input_allocate_device(); | |
6a12afb5 TI |
131 | if (!input_dev) { |
132 | kfree(beep); | |
133 | return -ENOMEM; | |
134 | } | |
1cd2224c MR |
135 | |
136 | /* setup digital beep device */ | |
137 | input_dev->name = "HDA Digital PCBeep"; | |
138 | input_dev->phys = beep->phys; | |
139 | input_dev->id.bustype = BUS_PCI; | |
140 | ||
141 | input_dev->id.vendor = codec->vendor_id >> 16; | |
142 | input_dev->id.product = codec->vendor_id & 0xffff; | |
143 | input_dev->id.version = 0x01; | |
144 | ||
145 | input_dev->evbit[0] = BIT_MASK(EV_SND); | |
146 | input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); | |
147 | input_dev->event = snd_hda_beep_event; | |
148 | input_dev->dev.parent = &codec->bus->pci->dev; | |
149 | input_set_drvdata(input_dev, beep); | |
150 | ||
151 | err = input_register_device(input_dev); | |
152 | if (err < 0) { | |
f6154d6d | 153 | input_free_device(input_dev); |
1cd2224c MR |
154 | kfree(beep); |
155 | return err; | |
156 | } | |
157 | ||
158 | /* enable linear scale */ | |
159 | snd_hda_codec_write(codec, nid, 0, | |
160 | AC_VERB_SET_DIGI_CONVERT_2, 0x01); | |
161 | ||
162 | beep->nid = nid; | |
163 | beep->dev = input_dev; | |
164 | beep->codec = codec; | |
4d4e9bb3 | 165 | beep->enabled = 1; |
1cd2224c MR |
166 | codec->beep = beep; |
167 | ||
168 | INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); | |
169 | return 0; | |
170 | } | |
ff7a3267 | 171 | EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device); |
1cd2224c MR |
172 | |
173 | void snd_hda_detach_beep_device(struct hda_codec *codec) | |
174 | { | |
175 | struct hda_beep *beep = codec->beep; | |
176 | if (beep) { | |
177 | cancel_work_sync(&beep->beep_work); | |
1cd2224c MR |
178 | |
179 | input_unregister_device(beep->dev); | |
180 | kfree(beep); | |
c44765b8 | 181 | codec->beep = NULL; |
1cd2224c MR |
182 | } |
183 | } | |
ff7a3267 | 184 | EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device); |