1 /* 2 * (C) Copyright 2017 Rockchip Electronics Co., Ltd 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <adc.h> 9 #include <div64.h> 10 #include <dm.h> 11 #include <irq-generic.h> 12 #include <key.h> 13 #include <dm/lists.h> 14 #include <dm/uclass-internal.h> 15 16 #define KEY_WARN(fmt, args...) printf("Key Warn: "fmt, ##args) 17 #define KEY_ERR(fmt, args...) printf("Key Error: "fmt, ##args) 18 #define KEY_DBG(fmt, args...) debug("Key Debug: "fmt, ##args) 19 20 static inline uint64_t arch_counter_get_cntpct(void) 21 { 22 uint64_t cval = 0; 23 24 isb(); 25 #ifdef CONFIG_ARM64 26 asm volatile("mrs %0, cntpct_el0" : "=r" (cval)); 27 #else 28 asm volatile("mrrc p15, 0, %Q0, %R0, c14" : "=r" (cval)); 29 #endif 30 return cval; 31 } 32 33 uint64_t key_timer(uint64_t base) 34 { 35 uint64_t cntpct; 36 37 cntpct = arch_counter_get_cntpct() / 24000UL; 38 return (cntpct > base) ? (cntpct - base) : 0; 39 } 40 41 #ifdef CONFIG_ADC 42 static int adc_raw_to_mV(struct udevice *dev, unsigned int raw, int *mV) 43 { 44 unsigned int data_mask; 45 int ret, vref = 1800000; 46 u64 raw64 = raw; 47 48 ret = adc_data_mask(dev, &data_mask); 49 if (ret) 50 return ret; 51 52 raw64 *= vref; 53 do_div(raw64, data_mask); 54 *mV = raw64; 55 56 return 0; 57 } 58 59 static int key_adc_event(struct udevice *dev, 60 struct dm_key_uclass_platdata *uc_key, int adcval) 61 { 62 int val = adcval; 63 64 if (uc_key->in_volt) { 65 if (adc_raw_to_mV(dev, adcval, &val)) 66 return KEY_PRESS_NONE; 67 } 68 69 debug("[%s] <%d, %d, %d>: adcval=%d -> mV=%d\n", 70 uc_key->name, uc_key->min, uc_key->center, uc_key->max, 71 adcval, val); 72 73 return (val <= uc_key->max && val >= uc_key->min) ? 74 KEY_PRESS_DOWN : KEY_PRESS_NONE; 75 } 76 #endif 77 78 static int key_gpio_event(struct dm_key_uclass_platdata *uc_key) 79 { 80 if (!dm_gpio_is_valid(&uc_key->gpio)) { 81 KEY_ERR("'%s' Invalid gpio\n", uc_key->name); 82 return KEY_PRESS_NONE; 83 } 84 85 return dm_gpio_get_value(&uc_key->gpio) ? 86 KEY_PRESS_DOWN : KEY_PRESS_NONE; 87 } 88 89 static int key_gpio_interrupt_event(struct dm_key_uclass_platdata *uc_key) 90 { 91 int event; 92 93 debug("%s: %s: up=%llu, down=%llu, delta=%llu\n", 94 __func__, uc_key->name, uc_key->rise_ms, uc_key->fall_ms, 95 uc_key->rise_ms - uc_key->fall_ms); 96 97 /* Possible this is machine power-on long pressed, so ignore this */ 98 if (uc_key->fall_ms == 0 && uc_key->rise_ms != 0) { 99 event = KEY_PRESS_NONE; 100 goto out; 101 } 102 103 if ((uc_key->rise_ms > uc_key->fall_ms) && 104 (uc_key->rise_ms - uc_key->fall_ms) >= KEY_LONG_DOWN_MS) { 105 uc_key->rise_ms = 0; 106 uc_key->fall_ms = 0; 107 event = KEY_PRESS_LONG_DOWN; 108 KEY_DBG("%s key long pressed..\n", uc_key->name); 109 } else if (uc_key->fall_ms && 110 key_timer(uc_key->fall_ms) >= KEY_LONG_DOWN_MS) { 111 uc_key->rise_ms = 0; 112 uc_key->fall_ms = 0; 113 event = KEY_PRESS_LONG_DOWN; 114 KEY_DBG("%s key long pressed(hold)..\n", uc_key->name); 115 } else if ((uc_key->rise_ms > uc_key->fall_ms) && 116 (uc_key->rise_ms - uc_key->fall_ms) < KEY_LONG_DOWN_MS) { 117 uc_key->rise_ms = 0; 118 uc_key->fall_ms = 0; 119 event = KEY_PRESS_DOWN; 120 KEY_DBG("%s key short pressed..\n", uc_key->name); 121 /* Possible in charge animation, we enable irq after fuel gauge updated */ 122 } else if (uc_key->rise_ms && uc_key->fall_ms && 123 (uc_key->rise_ms == uc_key->fall_ms)) { 124 uc_key->rise_ms = 0; 125 uc_key->fall_ms = 0; 126 event = KEY_PRESS_DOWN; 127 KEY_DBG("%s key short pressed..\n", uc_key->name); 128 } else { 129 event = KEY_PRESS_NONE; 130 } 131 132 out: 133 return event; 134 } 135 136 int key_is_pressed(int event) 137 { 138 return (event == KEY_PRESS_DOWN || event == KEY_PRESS_LONG_DOWN); 139 } 140 141 static int key_core_read(struct dm_key_uclass_platdata *uc_key) 142 { 143 if (uc_key->type == ADC_KEY) { 144 #ifdef CONFIG_ADC 145 struct udevice *dev; 146 unsigned int adcval; 147 int ret; 148 149 ret = uclass_get_device_by_name(UCLASS_ADC, "saradc", &dev); 150 if (ret) { 151 KEY_ERR("%s: No saradc\n", uc_key->name); 152 return KEY_NOT_EXIST; 153 } 154 155 ret = adc_start_channel(dev, uc_key->channel); 156 if (ret) { 157 KEY_ERR("%s: Failed to start saradc\n", uc_key->name); 158 return KEY_NOT_EXIST; 159 } 160 161 ret = adc_channel_data(dev, uc_key->channel, &adcval); 162 if (ret) { 163 KEY_ERR("%s: Failed to read saradc, %d\n", uc_key->name, ret); 164 return KEY_NOT_EXIST; 165 } 166 167 return key_adc_event(dev, uc_key, adcval); 168 #else 169 return KEY_NOT_EXIST; 170 #endif 171 } 172 173 return (uc_key->code == KEY_POWER) ? 174 key_gpio_interrupt_event(uc_key) : 175 key_gpio_event(uc_key); 176 } 177 178 int key_read(int code) 179 { 180 struct dm_key_uclass_platdata *uc_key; 181 struct udevice *dev; 182 struct uclass *uc; 183 bool allow_pre_reloc = false; 184 int ret, event = KEY_NOT_EXIST; 185 186 ret = uclass_get(UCLASS_KEY, &uc); 187 if (ret) 188 return ret; 189 190 try_again: 191 for (uclass_first_device(UCLASS_KEY, &dev); 192 dev; 193 uclass_next_device(&dev)) { 194 uc_key = dev_get_uclass_platdata(dev); 195 196 if (!allow_pre_reloc && uc_key->pre_reloc) 197 continue; 198 199 if (uc_key->code != code) 200 continue; 201 202 event = key_core_read(uc_key); 203 if (key_is_pressed(event)) 204 return event; 205 } 206 207 /* If not find valid key node from kernel, try from u-boot */ 208 if (event == KEY_NOT_EXIST && !allow_pre_reloc) { 209 allow_pre_reloc = true; 210 goto try_again; 211 } 212 213 return event; 214 } 215 216 int key_exist(int code) 217 { 218 struct dm_key_uclass_platdata *uc_key; 219 struct udevice *dev; 220 221 for (uclass_find_first_device(UCLASS_KEY, &dev); 222 dev; 223 uclass_find_next_device(&dev)) { 224 uc_key = dev_get_uclass_platdata(dev); 225 226 if (uc_key->code == code) 227 return 1; 228 } 229 230 return 0; 231 } 232 233 #if CONFIG_IS_ENABLED(IRQ) 234 #if defined(CONFIG_PWRKEY_DNL_TRIGGER_NUM) && \ 235 (CONFIG_PWRKEY_DNL_TRIGGER_NUM > 0) 236 static void power_key_download(struct dm_key_uclass_platdata *uc_key) 237 { 238 int trig_cnt = CONFIG_PWRKEY_DNL_TRIGGER_NUM; 239 static u64 old_rise_ms; 240 241 if (uc_key->code == KEY_POWER && old_rise_ms != uc_key->rise_ms) { 242 old_rise_ms = uc_key->rise_ms; 243 uc_key->trig_cnt++; 244 if (uc_key->trig_cnt >= trig_cnt) { 245 printf("\nEnter download mode by pwrkey\n"); 246 irq_handler_disable(uc_key->irq); 247 run_command("download", 0); 248 } 249 } 250 } 251 252 int pwrkey_download_init(void) 253 { 254 return (KEY_NOT_EXIST == key_read(KEY_POWER)); 255 } 256 #endif 257 258 static void gpio_irq_handler(int irq, void *data) 259 { 260 struct udevice *dev = data; 261 struct dm_key_uclass_platdata *uc_key = dev_get_uclass_platdata(dev); 262 263 if (uc_key->irq != irq) 264 return; 265 266 if (uc_key->irq_thread) { 267 uc_key->irq_thread(irq, data); 268 } else { 269 if (irq_get_gpio_level(irq)) { 270 uc_key->rise_ms = key_timer(0); 271 KEY_DBG("%s: key dn: %llu ms\n", 272 uc_key->name, uc_key->fall_ms); 273 } else { 274 uc_key->fall_ms = key_timer(0); 275 KEY_DBG("%s: key up: %llu ms\n", 276 uc_key->name, uc_key->rise_ms); 277 } 278 279 /* Must delay */ 280 mdelay(10); 281 irq_revert_irq_type(irq); 282 } 283 284 /* Hook event: enter download mode by pwrkey */ 285 #if defined(CONFIG_PWRKEY_DNL_TRIGGER_NUM) && \ 286 (CONFIG_PWRKEY_DNL_TRIGGER_NUM > 0) 287 power_key_download(uc_key); 288 #endif 289 } 290 #endif 291 292 int key_bind_children(struct udevice *dev, const char *drv_name) 293 { 294 const char *name; 295 ofnode node; 296 int ret; 297 298 dev_for_each_subnode(node, dev) { 299 /* 300 * If this node has "compatible" property, this is not 301 * a amp subnode, but a normal device. skip. 302 */ 303 ofnode_get_property(node, "compatible", &ret); 304 if (ret >= 0) 305 continue; 306 307 if (ret != -FDT_ERR_NOTFOUND) 308 return ret; 309 310 name = ofnode_get_name(node); 311 if (!name) 312 return -EINVAL; 313 ret = device_bind_driver_to_node(dev, drv_name, name, 314 node, NULL); 315 if (ret) 316 return ret; 317 } 318 319 return 0; 320 } 321 322 static int key_post_probe(struct udevice *dev) 323 { 324 struct dm_key_uclass_platdata *uc_key; 325 int ret; 326 327 uc_key = dev_get_uclass_platdata(dev); 328 if (!uc_key) 329 return -ENXIO; 330 331 /* True from U-Boot key node */ 332 uc_key->pre_reloc = dev_read_bool(dev, "u-boot,dm-pre-reloc") || 333 dev_read_bool(dev, "u-boot,dm-spl"); 334 335 if (uc_key->type != ADC_KEY) { 336 if (uc_key->code == KEY_POWER) { 337 #if CONFIG_IS_ENABLED(IRQ) 338 int irq; 339 340 if (uc_key->skip_irq_init) 341 return 0; 342 343 irq = phandle_gpio_to_irq(uc_key->gpios[0], 344 uc_key->gpios[1]); 345 if (irq < 0) { 346 KEY_ERR("%s: failed to request irq, ret=%d\n", 347 uc_key->name, irq); 348 return irq; 349 } 350 351 if (uc_key->code != KEY_POWER && uc_key->irq_thread) { 352 KEY_WARN("%s: only power key can request irq thread\n", 353 uc_key->name); 354 return -EINVAL; 355 } 356 357 uc_key->irq = irq; 358 irq_install_handler(irq, gpio_irq_handler, dev); 359 irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING); 360 irq_handler_enable(irq); 361 #else 362 KEY_WARN("%s: no IRQ framework available\n", uc_key->name); 363 #endif 364 } else { 365 ret = gpio_request_by_name(dev, "gpios", 0, 366 &uc_key->gpio, GPIOD_IS_IN); 367 if (ret) { 368 KEY_ERR("%s: failed to request gpio, ret=%d\n", 369 uc_key->name, ret); 370 return ret; 371 } 372 } 373 } 374 375 #ifdef DEBUG 376 printf("[%s] (%s, %s, %s):\n", uc_key->name, 377 uc_key->type == ADC_KEY ? "ADC" : "GPIO", 378 uc_key->pre_reloc ? "U-Boot" : "Kernel", 379 dev->parent->name); 380 381 if (uc_key->type == ADC_KEY) { 382 printf(" %s: %d (%d, %d)\n", 383 uc_key->in_volt ? "volt" : " adc", 384 uc_key->center, uc_key->min, uc_key->max); 385 printf(" channel: %d\n\n", uc_key->channel); 386 } else { 387 const char *gpio_name = 388 ofnode_get_name(ofnode_get_by_phandle(uc_key->gpios[0])); 389 390 printf(" irq: %d\n", uc_key->irq); 391 printf(" gpio[0]: %s\n", gpio_name); 392 printf(" gpio[1]: %d\n\n", uc_key->gpios[1]); 393 } 394 #endif 395 396 return 0; 397 } 398 399 UCLASS_DRIVER(key) = { 400 .id = UCLASS_KEY, 401 .name = "key", 402 .post_probe = key_post_probe, 403 .per_device_platdata_auto_alloc_size = 404 sizeof(struct dm_key_uclass_platdata), 405 }; 406