1 /* 2 * axp20x power button driver. 3 * 4 * Copyright (C) 2013 Carlo Caione <carlo@caione.org> 5 * 6 * This file is subject to the terms and conditions of the GNU General 7 * Public License. See the file "COPYING" in the main directory of this 8 * archive for more details. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/acpi.h> 17 #include <linux/errno.h> 18 #include <linux/irq.h> 19 #include <linux/init.h> 20 #include <linux/input.h> 21 #include <linux/interrupt.h> 22 #include <linux/kernel.h> 23 #include <linux/mfd/axp20x.h> 24 #include <linux/module.h> 25 #include <linux/platform_device.h> 26 #include <linux/regmap.h> 27 #include <linux/slab.h> 28 29 #define AXP20X_PEK_STARTUP_MASK (0xc0) 30 #define AXP20X_PEK_SHUTDOWN_MASK (0x03) 31 32 struct axp20x_info { 33 const struct axp20x_time *startup_time; 34 unsigned int startup_mask; 35 const struct axp20x_time *shutdown_time; 36 unsigned int shutdown_mask; 37 }; 38 39 struct axp20x_pek { 40 struct axp20x_dev *axp20x; 41 struct input_dev *input; 42 struct axp20x_info *info; 43 int irq_dbr; 44 int irq_dbf; 45 }; 46 47 struct axp20x_time { 48 unsigned int time; 49 unsigned int idx; 50 }; 51 52 static const struct axp20x_time startup_time[] = { 53 { .time = 128, .idx = 0 }, 54 { .time = 1000, .idx = 2 }, 55 { .time = 3000, .idx = 1 }, 56 { .time = 2000, .idx = 3 }, 57 }; 58 59 static const struct axp20x_time axp221_startup_time[] = { 60 { .time = 128, .idx = 0 }, 61 { .time = 1000, .idx = 1 }, 62 { .time = 2000, .idx = 2 }, 63 { .time = 3000, .idx = 3 }, 64 }; 65 66 static const struct axp20x_time shutdown_time[] = { 67 { .time = 4000, .idx = 0 }, 68 { .time = 6000, .idx = 1 }, 69 { .time = 8000, .idx = 2 }, 70 { .time = 10000, .idx = 3 }, 71 }; 72 73 static const struct axp20x_info axp20x_info = { 74 .startup_time = startup_time, 75 .startup_mask = AXP20X_PEK_STARTUP_MASK, 76 .shutdown_time = shutdown_time, 77 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK, 78 }; 79 80 static const struct axp20x_info axp221_info = { 81 .startup_time = axp221_startup_time, 82 .startup_mask = AXP20X_PEK_STARTUP_MASK, 83 .shutdown_time = shutdown_time, 84 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK, 85 }; 86 87 static ssize_t axp20x_show_attr(struct device *dev, 88 const struct axp20x_time *time, 89 unsigned int mask, char *buf) 90 { 91 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 92 unsigned int val; 93 int ret, i; 94 95 ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val); 96 if (ret != 0) 97 return ret; 98 99 val &= mask; 100 val >>= ffs(mask) - 1; 101 102 for (i = 0; i < 4; i++) 103 if (val == time[i].idx) 104 val = time[i].time; 105 106 return sprintf(buf, "%u\n", val); 107 } 108 109 static ssize_t axp20x_show_attr_startup(struct device *dev, 110 struct device_attribute *attr, 111 char *buf) 112 { 113 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 114 115 return axp20x_show_attr(dev, axp20x_pek->info->startup_time, 116 axp20x_pek->info->startup_mask, buf); 117 } 118 119 static ssize_t axp20x_show_attr_shutdown(struct device *dev, 120 struct device_attribute *attr, 121 char *buf) 122 { 123 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 124 125 return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time, 126 axp20x_pek->info->shutdown_mask, buf); 127 } 128 129 static ssize_t axp20x_store_attr(struct device *dev, 130 const struct axp20x_time *time, 131 unsigned int mask, const char *buf, 132 size_t count) 133 { 134 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 135 char val_str[20]; 136 size_t len; 137 int ret, i; 138 unsigned int val, idx = 0; 139 unsigned int best_err = UINT_MAX; 140 141 val_str[sizeof(val_str) - 1] = '\0'; 142 strncpy(val_str, buf, sizeof(val_str) - 1); 143 len = strlen(val_str); 144 145 if (len && val_str[len - 1] == '\n') 146 val_str[len - 1] = '\0'; 147 148 ret = kstrtouint(val_str, 10, &val); 149 if (ret) 150 return ret; 151 152 for (i = 3; i >= 0; i--) { 153 unsigned int err; 154 155 err = abs(time[i].time - val); 156 if (err < best_err) { 157 best_err = err; 158 idx = time[i].idx; 159 } 160 161 if (!err) 162 break; 163 } 164 165 idx <<= ffs(mask) - 1; 166 ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, 167 mask, idx); 168 if (ret != 0) 169 return -EINVAL; 170 171 return count; 172 } 173 174 static ssize_t axp20x_store_attr_startup(struct device *dev, 175 struct device_attribute *attr, 176 const char *buf, size_t count) 177 { 178 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 179 180 return axp20x_store_attr(dev, axp20x_pek->info->startup_time, 181 axp20x_pek->info->startup_mask, buf, count); 182 } 183 184 static ssize_t axp20x_store_attr_shutdown(struct device *dev, 185 struct device_attribute *attr, 186 const char *buf, size_t count) 187 { 188 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 189 190 return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time, 191 axp20x_pek->info->shutdown_mask, buf, count); 192 } 193 194 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, 195 axp20x_store_attr_startup); 196 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown, 197 axp20x_store_attr_shutdown); 198 199 static struct attribute *axp20x_attrs[] = { 200 &dev_attr_startup.attr, 201 &dev_attr_shutdown.attr, 202 NULL, 203 }; 204 ATTRIBUTE_GROUPS(axp20x); 205 206 static irqreturn_t axp20x_pek_irq(int irq, void *pwr) 207 { 208 struct axp20x_pek *axp20x_pek = pwr; 209 struct input_dev *idev = axp20x_pek->input; 210 211 if (!idev) 212 return IRQ_HANDLED; 213 214 /* 215 * The power-button is connected to ground so a falling edge (dbf) 216 * means it is pressed. 217 */ 218 if (irq == axp20x_pek->irq_dbf) 219 input_report_key(idev, KEY_POWER, true); 220 else if (irq == axp20x_pek->irq_dbr) 221 input_report_key(idev, KEY_POWER, false); 222 223 input_sync(idev); 224 225 return IRQ_HANDLED; 226 } 227 228 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, 229 struct platform_device *pdev) 230 { 231 struct input_dev *idev; 232 int error; 233 234 axp20x_pek->input = devm_input_allocate_device(&pdev->dev); 235 if (!axp20x_pek->input) 236 return -ENOMEM; 237 238 idev = axp20x_pek->input; 239 240 idev->name = "axp20x-pek"; 241 idev->phys = "m1kbd/input2"; 242 idev->dev.parent = &pdev->dev; 243 244 input_set_capability(idev, EV_KEY, KEY_POWER); 245 246 input_set_drvdata(idev, axp20x_pek); 247 248 error = input_register_device(idev); 249 if (error) { 250 dev_err(&pdev->dev, "Can't register input device: %d\n", 251 error); 252 return error; 253 } 254 255 return 0; 256 } 257 258 #ifdef CONFIG_ACPI 259 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 260 struct platform_device *pdev) 261 { 262 unsigned long long hrv = 0; 263 acpi_status status; 264 265 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && 266 axp20x_pek->axp20x->variant == AXP288_ID) { 267 status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent), 268 "_HRV", NULL, &hrv); 269 if (ACPI_FAILURE(status)) 270 dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n"); 271 272 /* 273 * On Cherry Trail platforms (hrv == 3), do not register the 274 * input device if there is an "INTCFD9" or "ACPI0011" gpio 275 * button ACPI device, as that handles the power button too, 276 * and otherwise we end up reporting all presses twice. 277 */ 278 if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) || 279 acpi_dev_present("ACPI0011", NULL, -1))) 280 return false; 281 282 } 283 284 return true; 285 } 286 #else 287 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 288 struct platform_device *pdev) 289 { 290 return true; 291 } 292 #endif 293 294 static int axp20x_pek_probe(struct platform_device *pdev) 295 { 296 struct axp20x_pek *axp20x_pek; 297 const struct platform_device_id *match = platform_get_device_id(pdev); 298 int error; 299 300 if (!match) { 301 dev_err(&pdev->dev, "Failed to get platform_device_id\n"); 302 return -EINVAL; 303 } 304 305 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), 306 GFP_KERNEL); 307 if (!axp20x_pek) 308 return -ENOMEM; 309 310 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); 311 312 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); 313 if (axp20x_pek->irq_dbr < 0) 314 return axp20x_pek->irq_dbr; 315 axp20x_pek->irq_dbr = regmap_irq_get_virq( 316 axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr); 317 318 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); 319 if (axp20x_pek->irq_dbf < 0) 320 return axp20x_pek->irq_dbf; 321 axp20x_pek->irq_dbf = regmap_irq_get_virq( 322 axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf); 323 324 if (axp20x_pek_should_register_input(axp20x_pek, pdev)) { 325 error = axp20x_pek_probe_input_device(axp20x_pek, pdev); 326 if (error) 327 return error; 328 } 329 330 axp20x_pek->info = (struct axp20x_info *)match->driver_data; 331 332 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, 333 axp20x_pek_irq, 0, 334 "axp20x-pek-dbr", axp20x_pek); 335 if (error < 0) { 336 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", 337 axp20x_pek->irq_dbr, error); 338 return error; 339 } 340 341 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, 342 axp20x_pek_irq, 0, 343 "axp20x-pek-dbf", axp20x_pek); 344 if (error < 0) { 345 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", 346 axp20x_pek->irq_dbf, error); 347 return error; 348 } 349 350 device_init_wakeup(&pdev->dev, true); 351 352 platform_set_drvdata(pdev, axp20x_pek); 353 354 return 0; 355 } 356 357 static int __maybe_unused axp20x_pek_suspend(struct device *dev) 358 { 359 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 360 361 /* 362 * As nested threaded IRQs are not automatically disabled during 363 * suspend, we must explicitly disable non-wakeup IRQs. 364 */ 365 if (device_may_wakeup(dev)) { 366 enable_irq_wake(axp20x_pek->irq_dbf); 367 enable_irq_wake(axp20x_pek->irq_dbr); 368 } else { 369 disable_irq(axp20x_pek->irq_dbf); 370 disable_irq(axp20x_pek->irq_dbr); 371 } 372 373 return 0; 374 } 375 376 static int __maybe_unused axp20x_pek_resume(struct device *dev) 377 { 378 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 379 380 if (device_may_wakeup(dev)) { 381 disable_irq_wake(axp20x_pek->irq_dbf); 382 disable_irq_wake(axp20x_pek->irq_dbr); 383 } else { 384 enable_irq(axp20x_pek->irq_dbf); 385 enable_irq(axp20x_pek->irq_dbr); 386 } 387 388 return 0; 389 } 390 391 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev) 392 { 393 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 394 395 if (axp20x_pek->axp20x->variant != AXP288_ID) 396 return 0; 397 398 /* 399 * Clear interrupts from button presses during suspend, to avoid 400 * a wakeup power-button press getting reported to userspace. 401 */ 402 regmap_write(axp20x_pek->axp20x->regmap, 403 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8, 404 BIT(AXP288_IRQ_POKN % 8)); 405 406 return 0; 407 } 408 409 static const struct dev_pm_ops axp20x_pek_pm_ops = { 410 SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume) 411 #ifdef CONFIG_PM_SLEEP 412 .resume_noirq = axp20x_pek_resume_noirq, 413 #endif 414 }; 415 416 static const struct platform_device_id axp_pek_id_match[] = { 417 { 418 .name = "axp20x-pek", 419 .driver_data = (kernel_ulong_t)&axp20x_info, 420 }, 421 { 422 .name = "axp221-pek", 423 .driver_data = (kernel_ulong_t)&axp221_info, 424 }, 425 { /* sentinel */ } 426 }; 427 MODULE_DEVICE_TABLE(platform, axp_pek_id_match); 428 429 static struct platform_driver axp20x_pek_driver = { 430 .probe = axp20x_pek_probe, 431 .id_table = axp_pek_id_match, 432 .driver = { 433 .name = "axp20x-pek", 434 .pm = &axp20x_pek_pm_ops, 435 .dev_groups = axp20x_groups, 436 }, 437 }; 438 module_platform_driver(axp20x_pek_driver); 439 440 MODULE_DESCRIPTION("axp20x Power Button"); 441 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); 442 MODULE_LICENSE("GPL"); 443