1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Apple Onboard Audio feature call GPIO control 4 * 5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This file contains the GPIO control routines for 8 * direct (through feature calls) access to the GPIO 9 * registers. 10 */ 11 12 #include <linux/of_irq.h> 13 #include <linux/interrupt.h> 14 #include <asm/pmac_feature.h> 15 #include "../aoa.h" 16 17 /* TODO: these are lots of global variables 18 * that aren't used on most machines... 19 * Move them into a dynamically allocated 20 * structure and use that. 21 */ 22 23 /* these are the GPIO numbers (register addresses as offsets into 24 * the GPIO space) */ 25 static int headphone_mute_gpio; 26 static int master_mute_gpio; 27 static int amp_mute_gpio; 28 static int lineout_mute_gpio; 29 static int hw_reset_gpio; 30 static int lineout_detect_gpio; 31 static int headphone_detect_gpio; 32 static int linein_detect_gpio; 33 34 /* see the SWITCH_GPIO macro */ 35 static int headphone_mute_gpio_activestate; 36 static int master_mute_gpio_activestate; 37 static int amp_mute_gpio_activestate; 38 static int lineout_mute_gpio_activestate; 39 static int hw_reset_gpio_activestate; 40 static int lineout_detect_gpio_activestate; 41 static int headphone_detect_gpio_activestate; 42 static int linein_detect_gpio_activestate; 43 44 /* node pointers that we save when getting the GPIO number 45 * to get the interrupt later */ 46 static struct device_node *lineout_detect_node; 47 static struct device_node *linein_detect_node; 48 static struct device_node *headphone_detect_node; 49 50 static int lineout_detect_irq; 51 static int linein_detect_irq; 52 static int headphone_detect_irq; 53 54 static struct device_node *get_gpio(char *name, 55 char *altname, 56 int *gpioptr, 57 int *gpioactiveptr) 58 { 59 struct device_node *np, *gpio; 60 const u32 *reg; 61 const char *audio_gpio; 62 63 *gpioptr = -1; 64 65 /* check if we can get it the easy way ... */ 66 np = of_find_node_by_name(NULL, name); 67 if (!np) { 68 /* some machines have only gpioX/extint-gpioX nodes, 69 * and an audio-gpio property saying what it is ... 70 * So what we have to do is enumerate all children 71 * of the gpio node and check them all. */ 72 gpio = of_find_node_by_name(NULL, "gpio"); 73 if (!gpio) 74 return NULL; 75 while ((np = of_get_next_child(gpio, np))) { 76 audio_gpio = of_get_property(np, "audio-gpio", NULL); 77 if (!audio_gpio) 78 continue; 79 if (strcmp(audio_gpio, name) == 0) 80 break; 81 if (altname && (strcmp(audio_gpio, altname) == 0)) 82 break; 83 } 84 of_node_put(gpio); 85 /* still not found, assume not there */ 86 if (!np) 87 return NULL; 88 } 89 90 reg = of_get_property(np, "reg", NULL); 91 if (!reg) { 92 of_node_put(np); 93 return NULL; 94 } 95 96 *gpioptr = *reg; 97 98 /* this is a hack, usually the GPIOs 'reg' property 99 * should have the offset based from the GPIO space 100 * which is at 0x50, but apparently not always... */ 101 if (*gpioptr < 0x50) 102 *gpioptr += 0x50; 103 104 reg = of_get_property(np, "audio-gpio-active-state", NULL); 105 if (!reg) 106 /* Apple seems to default to 1, but 107 * that doesn't seem right at least on most 108 * machines. So until proven that the opposite 109 * is necessary, we default to 0 110 * (which, incidentally, snd-powermac also does...) */ 111 *gpioactiveptr = 0; 112 else 113 *gpioactiveptr = *reg; 114 115 return np; 116 } 117 118 static void get_irq(struct device_node * np, int *irqptr) 119 { 120 if (np) 121 *irqptr = irq_of_parse_and_map(np, 0); 122 else 123 *irqptr = 0; 124 } 125 126 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */ 127 #define SWITCH_GPIO(name, v, on) \ 128 (((v)&~1) | ((on)? \ 129 (name##_gpio_activestate==0?4:5): \ 130 (name##_gpio_activestate==0?5:4))) 131 132 #define FTR_GPIO(name, bit) \ 133 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\ 134 { \ 135 int v; \ 136 \ 137 if (unlikely(!rt)) return; \ 138 \ 139 if (name##_mute_gpio < 0) \ 140 return; \ 141 \ 142 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, \ 143 name##_mute_gpio, \ 144 0); \ 145 \ 146 /* muted = !on... */ \ 147 v = SWITCH_GPIO(name##_mute, v, !on); \ 148 \ 149 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, \ 150 name##_mute_gpio, v); \ 151 \ 152 rt->implementation_private &= ~(1<<bit); \ 153 rt->implementation_private |= (!!on << bit); \ 154 } \ 155 static int ftr_gpio_get_##name(struct gpio_runtime *rt) \ 156 { \ 157 if (unlikely(!rt)) return 0; \ 158 return (rt->implementation_private>>bit)&1; \ 159 } 160 161 FTR_GPIO(headphone, 0); 162 FTR_GPIO(amp, 1); 163 FTR_GPIO(lineout, 2); 164 FTR_GPIO(master, 3); 165 166 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on) 167 { 168 int v; 169 170 if (unlikely(!rt)) return; 171 if (hw_reset_gpio < 0) 172 return; 173 174 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, 175 hw_reset_gpio, 0); 176 v = SWITCH_GPIO(hw_reset, v, on); 177 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, 178 hw_reset_gpio, v); 179 } 180 181 static struct gpio_methods methods; 182 183 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt) 184 { 185 int saved; 186 187 if (unlikely(!rt)) return; 188 saved = rt->implementation_private; 189 ftr_gpio_set_headphone(rt, 0); 190 ftr_gpio_set_amp(rt, 0); 191 ftr_gpio_set_lineout(rt, 0); 192 if (methods.set_master) 193 ftr_gpio_set_master(rt, 0); 194 rt->implementation_private = saved; 195 } 196 197 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt) 198 { 199 int s; 200 201 if (unlikely(!rt)) return; 202 s = rt->implementation_private; 203 ftr_gpio_set_headphone(rt, (s>>0)&1); 204 ftr_gpio_set_amp(rt, (s>>1)&1); 205 ftr_gpio_set_lineout(rt, (s>>2)&1); 206 if (methods.set_master) 207 ftr_gpio_set_master(rt, (s>>3)&1); 208 } 209 210 static void ftr_handle_notify(struct work_struct *work) 211 { 212 struct gpio_notification *notif = 213 container_of(work, struct gpio_notification, work.work); 214 215 guard(mutex)(¬if->mutex); 216 if (notif->notify) 217 notif->notify(notif->data); 218 } 219 220 static void gpio_enable_dual_edge(int gpio) 221 { 222 int v; 223 224 if (gpio == -1) 225 return; 226 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); 227 v |= 0x80; /* enable dual edge */ 228 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v); 229 } 230 231 static void ftr_gpio_init(struct gpio_runtime *rt) 232 { 233 get_gpio("headphone-mute", NULL, 234 &headphone_mute_gpio, 235 &headphone_mute_gpio_activestate); 236 get_gpio("amp-mute", NULL, 237 &_mute_gpio, 238 &_mute_gpio_activestate); 239 get_gpio("lineout-mute", NULL, 240 &lineout_mute_gpio, 241 &lineout_mute_gpio_activestate); 242 get_gpio("hw-reset", "audio-hw-reset", 243 &hw_reset_gpio, 244 &hw_reset_gpio_activestate); 245 if (get_gpio("master-mute", NULL, 246 &master_mute_gpio, 247 &master_mute_gpio_activestate)) { 248 methods.set_master = ftr_gpio_set_master; 249 methods.get_master = ftr_gpio_get_master; 250 } 251 252 headphone_detect_node = get_gpio("headphone-detect", NULL, 253 &headphone_detect_gpio, 254 &headphone_detect_gpio_activestate); 255 /* go Apple, and thanks for giving these different names 256 * across the board... */ 257 lineout_detect_node = get_gpio("lineout-detect", "line-output-detect", 258 &lineout_detect_gpio, 259 &lineout_detect_gpio_activestate); 260 linein_detect_node = get_gpio("linein-detect", "line-input-detect", 261 &linein_detect_gpio, 262 &linein_detect_gpio_activestate); 263 264 gpio_enable_dual_edge(headphone_detect_gpio); 265 gpio_enable_dual_edge(lineout_detect_gpio); 266 gpio_enable_dual_edge(linein_detect_gpio); 267 268 get_irq(headphone_detect_node, &headphone_detect_irq); 269 get_irq(lineout_detect_node, &lineout_detect_irq); 270 get_irq(linein_detect_node, &linein_detect_irq); 271 272 ftr_gpio_all_amps_off(rt); 273 rt->implementation_private = 0; 274 INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify); 275 INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify); 276 INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify); 277 mutex_init(&rt->headphone_notify.mutex); 278 mutex_init(&rt->line_in_notify.mutex); 279 mutex_init(&rt->line_out_notify.mutex); 280 } 281 282 static void ftr_gpio_exit(struct gpio_runtime *rt) 283 { 284 ftr_gpio_all_amps_off(rt); 285 rt->implementation_private = 0; 286 if (rt->headphone_notify.notify) 287 free_irq(headphone_detect_irq, &rt->headphone_notify); 288 if (rt->line_in_notify.gpio_private) 289 free_irq(linein_detect_irq, &rt->line_in_notify); 290 if (rt->line_out_notify.gpio_private) 291 free_irq(lineout_detect_irq, &rt->line_out_notify); 292 cancel_delayed_work_sync(&rt->headphone_notify.work); 293 cancel_delayed_work_sync(&rt->line_in_notify.work); 294 cancel_delayed_work_sync(&rt->line_out_notify.work); 295 mutex_destroy(&rt->headphone_notify.mutex); 296 mutex_destroy(&rt->line_in_notify.mutex); 297 mutex_destroy(&rt->line_out_notify.mutex); 298 } 299 300 static irqreturn_t ftr_handle_notify_irq(int xx, void *data) 301 { 302 struct gpio_notification *notif = data; 303 304 schedule_delayed_work(¬if->work, 0); 305 306 return IRQ_HANDLED; 307 } 308 309 static int ftr_set_notify(struct gpio_runtime *rt, 310 enum notify_type type, 311 notify_func_t notify, 312 void *data) 313 { 314 struct gpio_notification *notif; 315 notify_func_t old; 316 int irq; 317 char *name; 318 int err = -EBUSY; 319 320 switch (type) { 321 case AOA_NOTIFY_HEADPHONE: 322 notif = &rt->headphone_notify; 323 name = "headphone-detect"; 324 irq = headphone_detect_irq; 325 break; 326 case AOA_NOTIFY_LINE_IN: 327 notif = &rt->line_in_notify; 328 name = "linein-detect"; 329 irq = linein_detect_irq; 330 break; 331 case AOA_NOTIFY_LINE_OUT: 332 notif = &rt->line_out_notify; 333 name = "lineout-detect"; 334 irq = lineout_detect_irq; 335 break; 336 default: 337 return -EINVAL; 338 } 339 340 if (!irq) 341 return -ENODEV; 342 343 guard(mutex)(¬if->mutex); 344 345 old = notif->notify; 346 347 if (!old && !notify) 348 return 0; 349 350 if (old && notify) { 351 if (old == notify && notif->data == data) 352 err = 0; 353 return err; 354 } 355 356 if (old && !notify) 357 free_irq(irq, notif); 358 359 if (!old && notify) { 360 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif); 361 if (err) 362 return err; 363 } 364 365 notif->notify = notify; 366 notif->data = data; 367 368 return 0; 369 } 370 371 static int ftr_get_detect(struct gpio_runtime *rt, 372 enum notify_type type) 373 { 374 int gpio, ret, active; 375 376 switch (type) { 377 case AOA_NOTIFY_HEADPHONE: 378 gpio = headphone_detect_gpio; 379 active = headphone_detect_gpio_activestate; 380 break; 381 case AOA_NOTIFY_LINE_IN: 382 gpio = linein_detect_gpio; 383 active = linein_detect_gpio_activestate; 384 break; 385 case AOA_NOTIFY_LINE_OUT: 386 gpio = lineout_detect_gpio; 387 active = lineout_detect_gpio_activestate; 388 break; 389 default: 390 return -EINVAL; 391 } 392 393 if (gpio == -1) 394 return -ENODEV; 395 396 ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); 397 if (ret < 0) 398 return ret; 399 return ((ret >> 1) & 1) == active; 400 } 401 402 static struct gpio_methods methods = { 403 .init = ftr_gpio_init, 404 .exit = ftr_gpio_exit, 405 .all_amps_off = ftr_gpio_all_amps_off, 406 .all_amps_restore = ftr_gpio_all_amps_restore, 407 .set_headphone = ftr_gpio_set_headphone, 408 .set_speakers = ftr_gpio_set_amp, 409 .set_lineout = ftr_gpio_set_lineout, 410 .set_hw_reset = ftr_gpio_set_hw_reset, 411 .get_headphone = ftr_gpio_get_headphone, 412 .get_speakers = ftr_gpio_get_amp, 413 .get_lineout = ftr_gpio_get_lineout, 414 .set_notify = ftr_set_notify, 415 .get_detect = ftr_get_detect, 416 }; 417 418 struct gpio_methods *ftr_gpio_methods = &methods; 419 EXPORT_SYMBOL_GPL(ftr_gpio_methods); 420