sound/ppc/toonie.c

   1 /*
   2  * Mac Mini "toonie" mixer control
   3  *
   4  * Copyright (c) 2005 by Benjamin Herrenschmidt <benh@kernel.crashing.org>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #include <sound/driver.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/i2c.h>
  25 #include <linux/i2c-dev.h>
  26 #include <linux/kmod.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <sound/core.h>
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/machdep.h>
  33 #include <asm/pmac_feature.h>
  34 #include "pmac.h"
  35
  36 #undef DEBUG
  37
  38 #ifdef DEBUG
  39 #define DBG(fmt...) printk(fmt)
  40 #else
  41 #define DBG(fmt...)
  42 #endif
  43
  44 struct pmac_gpio {
  45         unsigned int addr;
  46         u8 active_val;
  47         u8 inactive_val;
  48         u8 active_state;
  49 };
  50
  51 struct pmac_toonie
  52 {
  53         struct pmac_gpio        hp_detect_gpio;
  54         struct pmac_gpio        hp_mute_gpio;
  55         struct pmac_gpio        amp_mute_gpio;
  56         int                     hp_detect_irq;
  57         int                     auto_mute_notify;
  58         struct work_struct      detect_work;
  59 };
  60
  61
  62 /*
  63  * gpio access
  64  */
  65 #define do_gpio_write(gp, val) \
  66         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, (gp)->addr, val)
  67 #define do_gpio_read(gp) \
  68         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, (gp)->addr, 0)
  69 #define tumbler_gpio_free(gp) /* NOP */
  70
  71 static void write_audio_gpio(struct pmac_gpio *gp, int active)
  72 {
  73         if (! gp->addr)
  74                 return;
  75         active = active ? gp->active_val : gp->inactive_val;
  76         do_gpio_write(gp, active);
  77         DBG("(I) gpio %x write %d\n", gp->addr, active);
  78 }
  79
  80 static int check_audio_gpio(struct pmac_gpio *gp)
  81 {
  82         int ret;
  83
  84         if (! gp->addr)
  85                 return 0;
  86
  87         ret = do_gpio_read(gp);
  88
  89         return (ret & 0xd) == (gp->active_val & 0xd);
  90 }
  91
  92 static int read_audio_gpio(struct pmac_gpio *gp)
  93 {
  94         int ret;
  95         if (! gp->addr)
  96                 return 0;
  97         ret = ((do_gpio_read(gp) & 0x02) !=0);
  98         return ret == gp->active_state;
  99 }
 100
 101
 102 enum { TOONIE_MUTE_HP, TOONIE_MUTE_AMP };
 103
 104 static int toonie_get_mute_switch(snd_kcontrol_t *kcontrol,
 105                                   snd_ctl_elem_value_t *ucontrol)
 106 {
 107         pmac_t *chip = snd_kcontrol_chip(kcontrol);
 108         struct pmac_toonie *mix = chip->mixer_data;
 109         struct pmac_gpio *gp;
 110
 111         if (mix == NULL)
 112                 return -ENODEV;
 113         switch(kcontrol->private_value) {
 114         case TOONIE_MUTE_HP:
 115                 gp = &mix->hp_mute_gpio;
 116                 break;
 117         case TOONIE_MUTE_AMP:
 118                 gp = &mix->amp_mute_gpio;
 119                 break;
 120         default:
 121                 return -EINVAL;;
 122         }
 123         ucontrol->value.integer.value[0] = !check_audio_gpio(gp);
 124         return 0;
 125 }
 126
 127 static int toonie_put_mute_switch(snd_kcontrol_t *kcontrol,
 128                                    snd_ctl_elem_value_t *ucontrol)
 129 {
 130         pmac_t *chip = snd_kcontrol_chip(kcontrol);
 131         struct pmac_toonie *mix = chip->mixer_data;
 132         struct pmac_gpio *gp;
 133         int val;
 134
 135         if (chip->update_automute && chip->auto_mute)
 136                 return 0; /* don't touch in the auto-mute mode */
 137
 138         if (mix == NULL)
 139                 return -ENODEV;
 140
 141         switch(kcontrol->private_value) {
 142         case TOONIE_MUTE_HP:
 143                 gp = &mix->hp_mute_gpio;
 144                 break;
 145         case TOONIE_MUTE_AMP:
 146                 gp = &mix->amp_mute_gpio;
 147                 break;
 148         default:
 149                 return -EINVAL;;
 150         }
 151         val = ! check_audio_gpio(gp);
 152         if (val != ucontrol->value.integer.value[0]) {
 153                 write_audio_gpio(gp, ! ucontrol->value.integer.value[0]);
 154                 return 1;
 155         }
 156         return 0;
 157 }
 158
 159 static snd_kcontrol_new_t toonie_hp_sw __initdata = {
 160         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 161         .name = "Headphone Playback Switch",
 162         .info = snd_pmac_boolean_mono_info,
 163         .get = toonie_get_mute_switch,
 164         .put = toonie_put_mute_switch,
 165         .private_value = TOONIE_MUTE_HP,
 166 };
 167 static snd_kcontrol_new_t toonie_speaker_sw __initdata = {
 168         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 169         .name = "PC Speaker Playback Switch",
 170         .info = snd_pmac_boolean_mono_info,
 171         .get = toonie_get_mute_switch,
 172         .put = toonie_put_mute_switch,
 173         .private_value = TOONIE_MUTE_AMP,
 174 };
 175
 176 /*
 177  * auto-mute stuffs
 178  */
 179 static int toonie_detect_headphone(pmac_t *chip)
 180 {
 181         struct pmac_toonie *mix = chip->mixer_data;
 182         int detect = 0;
 183
 184         if (mix->hp_detect_gpio.addr)
 185                 detect |= read_audio_gpio(&mix->hp_detect_gpio);
 186         return detect;
 187 }
 188
 189 static void toonie_check_mute(pmac_t *chip, struct pmac_gpio *gp, int val,
 190                               int do_notify, snd_kcontrol_t *sw)
 191 {
 192         if (check_audio_gpio(gp) != val) {
 193                 write_audio_gpio(gp, val);
 194                 if (do_notify)
 195                         snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
 196                                        &sw->id);
 197         }
 198 }
 199
 200 static void toonie_detect_handler(void *self)
 201 {
 202         pmac_t *chip = (pmac_t*) self;
 203         struct pmac_toonie *mix;
 204         int headphone;
 205
 206         if (!chip)
 207                 return;
 208
 209         mix = chip->mixer_data;
 210         snd_assert(mix, return);
 211
 212         headphone = toonie_detect_headphone(chip);
 213
 214         DBG("headphone: %d, lineout: %d\n", headphone, lineout);
 215
 216         if (headphone) {
 217                 /* unmute headphone/lineout & mute speaker */
 218                 toonie_check_mute(chip, &mix->hp_mute_gpio, 0,
 219                                   mix->auto_mute_notify, chip->master_sw_ctl);
 220                 toonie_check_mute(chip, &mix->amp_mute_gpio, 1,
 221                                   mix->auto_mute_notify, chip->speaker_sw_ctl);
 222         } else {
 223                 /* unmute speaker, mute others */
 224                 toonie_check_mute(chip, &mix->amp_mute_gpio, 0,
 225                                   mix->auto_mute_notify, chip->speaker_sw_ctl);
 226                 toonie_check_mute(chip, &mix->hp_mute_gpio, 1,
 227                                   mix->auto_mute_notify, chip->master_sw_ctl);
 228         }
 229         if (mix->auto_mute_notify) {
 230                 snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
 231                                        &chip->hp_detect_ctl->id);
 232         }
 233 }
 234
 235 static void toonie_update_automute(pmac_t *chip, int do_notify)
 236 {
 237         if (chip->auto_mute) {
 238                 struct pmac_toonie *mix;
 239                 mix = chip->mixer_data;
 240                 snd_assert(mix, return);
 241                 mix->auto_mute_notify = do_notify;
 242                 schedule_work(&mix->detect_work);
 243         }
 244 }
 245
 246 /* interrupt - headphone plug changed */
 247 static irqreturn_t toonie_hp_intr(int irq, void *devid, struct pt_regs *regs)
 248 {
 249         pmac_t *chip = devid;
 250
 251         if (chip->update_automute && chip->initialized) {
 252                 chip->update_automute(chip, 1);
 253                 return IRQ_HANDLED;
 254         }
 255         return IRQ_NONE;
 256 }
 257
 258 /* look for audio gpio device */
 259 static int find_audio_gpio(const char *name, const char *platform,
 260                            struct pmac_gpio *gp)
 261 {
 262         struct device_node *np;
 263         u32 *base, addr;
 264
 265         if (! (np = find_devices("gpio")))
 266                 return -ENODEV;
 267
 268         for (np = np->child; np; np = np->sibling) {
 269                 char *property = get_property(np, "audio-gpio", NULL);
 270                 if (property && strcmp(property, name) == 0)
 271                         break;
 272                 if (device_is_compatible(np, name))
 273                         break;
 274         }
 275         if (np == NULL)
 276                 return -ENODEV;
 277
 278         base = (u32 *)get_property(np, "AAPL,address", NULL);
 279         if (! base) {
 280                 base = (u32 *)get_property(np, "reg", NULL);
 281                 if (!base) {
 282                         DBG("(E) cannot find address for device %s !\n", name);
 283                         return -ENODEV;
 284                 }
 285                 addr = *base;
 286                 if (addr < 0x50)
 287                         addr += 0x50;
 288         } else
 289                 addr = *base;
 290
 291         gp->addr = addr & 0x0000ffff;
 292
 293         /* Try to find the active state, default to 0 ! */
 294         base = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
 295         if (base) {
 296                 gp->active_state = *base;
 297                 gp->active_val = (*base) ? 0x5 : 0x4;
 298                 gp->inactive_val = (*base) ? 0x4 : 0x5;
 299         } else {
 300                 u32 *prop = NULL;
 301                 gp->active_state = 0;
 302                 gp->active_val = 0x4;
 303                 gp->inactive_val = 0x5;
 304                 /* Here are some crude hacks to extract the GPIO polarity and
 305                  * open collector informations out of the do-platform script
 306                  * as we don't yet have an interpreter for these things
 307                  */
 308                 if (platform)
 309                         prop = (u32 *)get_property(np, platform, NULL);
 310                 if (prop) {
 311                         if (prop[3] == 0x9 && prop[4] == 0x9) {
 312                                 gp->active_val = 0xd;
 313                                 gp->inactive_val = 0xc;
 314                         }
 315                         if (prop[3] == 0x1 && prop[4] == 0x1) {
 316                                 gp->active_val = 0x5;
 317                                 gp->inactive_val = 0x4;
 318                         }
 319                 }
 320         }
 321
 322         DBG("(I) GPIO device %s found, offset: %x, active state: %d !\n",
 323             name, gp->addr, gp->active_state);
 324
 325         return (np->n_intrs > 0) ? np->intrs[0].line : 0;
 326 }
 327
 328 static void toonie_cleanup(pmac_t *chip)
 329 {
 330         struct pmac_toonie *mix = chip->mixer_data;
 331         if (! mix)
 332                 return;
 333         if (mix->hp_detect_irq >= 0)
 334                 free_irq(mix->hp_detect_irq, chip);
 335         kfree(mix);
 336         chip->mixer_data = NULL;
 337 }
 338
 339 int snd_pmac_toonie_init(pmac_t *chip)
 340 {
 341         struct pmac_toonie *mix;
 342
 343         mix = kmalloc(sizeof(*mix), GFP_KERNEL);
 344         if (! mix)
 345                 return -ENOMEM;
 346
 347         chip->mixer_data = mix;
 348         chip->mixer_free = toonie_cleanup;
 349
 350         find_audio_gpio("headphone-mute", NULL, &mix->hp_mute_gpio);
 351         find_audio_gpio("amp-mute", NULL, &mix->amp_mute_gpio);
 352         mix->hp_detect_irq = find_audio_gpio("headphone-detect",
 353                                              NULL, &mix->hp_detect_gpio);
 354
 355         strcpy(chip->card->mixername, "PowerMac Toonie");
 356
 357         chip->master_sw_ctl = snd_ctl_new1(&toonie_hp_sw, chip);
 358         snd_ctl_add(chip->card, chip->master_sw_ctl);
 359
 360         chip->speaker_sw_ctl = snd_ctl_new1(&toonie_speaker_sw, chip);
 361         snd_ctl_add(chip->card, chip->speaker_sw_ctl);
 362
 363         INIT_WORK(&mix->detect_work, toonie_detect_handler, (void *)chip);
 364
 365         if (mix->hp_detect_irq >= 0) {
 366                 snd_pmac_add_automute(chip);
 367
 368                 chip->detect_headphone = toonie_detect_headphone;
 369                 chip->update_automute = toonie_update_automute;
 370                 toonie_update_automute(chip, 0);
 371
 372                 if (request_irq(mix->hp_detect_irq, toonie_hp_intr, 0,
 373                                 "Sound Headphone Detection", chip) < 0)
 374                         mix->hp_detect_irq = -1;
 375         }
 376
 377         return 0;
 378 }
 379