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/slab.h> 25 #include <linux/workqueue.h> 26 #include <sound/core.h> 27 #include "hda_beep.h" 28 #include "hda_local.h" 29 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 */ 34 }; 35 36 static void snd_hda_generate_beep(struct work_struct *work) 37 { 38 struct hda_beep *beep = 39 container_of(work, struct hda_beep, beep_work); 40 struct hda_codec *codec = beep->codec; 41 42 if (!beep->enabled) 43 return; 44 45 /* generate tone */ 46 snd_hda_codec_write(codec, beep->nid, 0, 47 AC_VERB_SET_BEEP_CONTROL, beep->tone); 48 } 49 50 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs 51 * 52 * The tone frequency of beep generator on IDT/STAC codecs is 53 * defined from the 8bit tone parameter, in Hz, 54 * freq = 48000 * (257 - tone) / 1024 55 * that is from 12kHz to 93.75Hz in steps of 46.875 Hz 56 */ 57 static int beep_linear_tone(struct hda_beep *beep, int hz) 58 { 59 if (hz <= 0) 60 return 0; 61 hz *= 1000; /* fixed point */ 62 hz = hz - DIGBEEP_HZ_MIN 63 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */ 64 if (hz < 0) 65 hz = 0; /* turn off PC beep*/ 66 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN)) 67 hz = 1; /* max frequency */ 68 else { 69 hz /= DIGBEEP_HZ_STEP; 70 hz = 255 - hz; 71 } 72 return hz; 73 } 74 75 /* HD-audio standard beep tone parameter calculation 76 * 77 * The tone frequency in Hz is calculated as 78 * freq = 48000 / (tone * 4) 79 * from 47Hz to 12kHz 80 */ 81 static int beep_standard_tone(struct hda_beep *beep, int hz) 82 { 83 if (hz <= 0) 84 return 0; /* disabled */ 85 hz = 12000 / hz; 86 if (hz > 0xff) 87 return 0xff; 88 if (hz <= 0) 89 return 1; 90 return hz; 91 } 92 93 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type, 94 unsigned int code, int hz) 95 { 96 struct hda_beep *beep = input_get_drvdata(dev); 97 98 switch (code) { 99 case SND_BELL: 100 if (hz) 101 hz = 1000; 102 case SND_TONE: 103 if (beep->linear_tone) 104 beep->tone = beep_linear_tone(beep, hz); 105 else 106 beep->tone = beep_standard_tone(beep, hz); 107 break; 108 default: 109 return -1; 110 } 111 112 /* schedule beep event */ 113 schedule_work(&beep->beep_work); 114 return 0; 115 } 116 117 static void snd_hda_do_detach(struct hda_beep *beep) 118 { 119 input_unregister_device(beep->dev); 120 beep->dev = NULL; 121 cancel_work_sync(&beep->beep_work); 122 /* turn off beep for sure */ 123 snd_hda_codec_write(beep->codec, beep->nid, 0, 124 AC_VERB_SET_BEEP_CONTROL, 0); 125 } 126 127 static int snd_hda_do_attach(struct hda_beep *beep) 128 { 129 struct input_dev *input_dev; 130 struct hda_codec *codec = beep->codec; 131 int err; 132 133 input_dev = input_allocate_device(); 134 if (!input_dev) { 135 printk(KERN_INFO "hda_beep: unable to allocate input device\n"); 136 return -ENOMEM; 137 } 138 139 /* setup digital beep device */ 140 input_dev->name = "HDA Digital PCBeep"; 141 input_dev->phys = beep->phys; 142 input_dev->id.bustype = BUS_PCI; 143 144 input_dev->id.vendor = codec->vendor_id >> 16; 145 input_dev->id.product = codec->vendor_id & 0xffff; 146 input_dev->id.version = 0x01; 147 148 input_dev->evbit[0] = BIT_MASK(EV_SND); 149 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 150 input_dev->event = snd_hda_beep_event; 151 input_dev->dev.parent = &codec->bus->pci->dev; 152 input_set_drvdata(input_dev, beep); 153 154 err = input_register_device(input_dev); 155 if (err < 0) { 156 input_free_device(input_dev); 157 printk(KERN_INFO "hda_beep: unable to register input device\n"); 158 return err; 159 } 160 beep->dev = input_dev; 161 return 0; 162 } 163 164 static void snd_hda_do_register(struct work_struct *work) 165 { 166 struct hda_beep *beep = 167 container_of(work, struct hda_beep, register_work); 168 169 mutex_lock(&beep->mutex); 170 if (beep->enabled && !beep->dev) 171 snd_hda_do_attach(beep); 172 mutex_unlock(&beep->mutex); 173 } 174 175 static void snd_hda_do_unregister(struct work_struct *work) 176 { 177 struct hda_beep *beep = 178 container_of(work, struct hda_beep, unregister_work.work); 179 180 mutex_lock(&beep->mutex); 181 if (!beep->enabled && beep->dev) 182 snd_hda_do_detach(beep); 183 mutex_unlock(&beep->mutex); 184 } 185 186 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable) 187 { 188 struct hda_beep *beep = codec->beep; 189 enable = !!enable; 190 if (beep == NULL) 191 return 0; 192 if (beep->enabled != enable) { 193 beep->enabled = enable; 194 if (!enable) { 195 /* turn off beep */ 196 snd_hda_codec_write(beep->codec, beep->nid, 0, 197 AC_VERB_SET_BEEP_CONTROL, 0); 198 } 199 if (beep->mode == HDA_BEEP_MODE_SWREG) { 200 if (enable) { 201 cancel_delayed_work(&beep->unregister_work); 202 schedule_work(&beep->register_work); 203 } else { 204 schedule_delayed_work(&beep->unregister_work, 205 HZ); 206 } 207 } 208 return 1; 209 } 210 return 0; 211 } 212 EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device); 213 214 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) 215 { 216 struct hda_beep *beep; 217 218 if (!snd_hda_get_bool_hint(codec, "beep")) 219 return 0; /* disabled explicitly by hints */ 220 if (codec->beep_mode == HDA_BEEP_MODE_OFF) 221 return 0; /* disabled by module option */ 222 223 beep = kzalloc(sizeof(*beep), GFP_KERNEL); 224 if (beep == NULL) 225 return -ENOMEM; 226 snprintf(beep->phys, sizeof(beep->phys), 227 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr); 228 /* enable linear scale */ 229 snd_hda_codec_write(codec, nid, 0, 230 AC_VERB_SET_DIGI_CONVERT_2, 0x01); 231 232 beep->nid = nid; 233 beep->codec = codec; 234 beep->mode = codec->beep_mode; 235 codec->beep = beep; 236 237 INIT_WORK(&beep->register_work, &snd_hda_do_register); 238 INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister); 239 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); 240 mutex_init(&beep->mutex); 241 242 if (beep->mode == HDA_BEEP_MODE_ON) { 243 int err = snd_hda_do_attach(beep); 244 if (err < 0) { 245 kfree(beep); 246 codec->beep = NULL; 247 return err; 248 } 249 } 250 251 return 0; 252 } 253 EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device); 254 255 void snd_hda_detach_beep_device(struct hda_codec *codec) 256 { 257 struct hda_beep *beep = codec->beep; 258 if (beep) { 259 cancel_work_sync(&beep->register_work); 260 cancel_delayed_work(&beep->unregister_work); 261 if (beep->dev) 262 snd_hda_do_detach(beep); 263 codec->beep = NULL; 264 kfree(beep); 265 } 266 } 267 EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device); 268