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 input_dev *idev = pwr; 209 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev); 210 211 /* 212 * The power-button is connected to ground so a falling edge (dbf) 213 * means it is pressed. 214 */ 215 if (irq == axp20x_pek->irq_dbf) 216 input_report_key(idev, KEY_POWER, true); 217 else if (irq == axp20x_pek->irq_dbr) 218 input_report_key(idev, KEY_POWER, false); 219 220 input_sync(idev); 221 222 return IRQ_HANDLED; 223 } 224 225 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, 226 struct platform_device *pdev) 227 { 228 struct axp20x_dev *axp20x = axp20x_pek->axp20x; 229 struct input_dev *idev; 230 int error; 231 232 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); 233 if (axp20x_pek->irq_dbr < 0) 234 return axp20x_pek->irq_dbr; 235 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc, 236 axp20x_pek->irq_dbr); 237 238 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); 239 if (axp20x_pek->irq_dbf < 0) 240 return axp20x_pek->irq_dbf; 241 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc, 242 axp20x_pek->irq_dbf); 243 244 axp20x_pek->input = devm_input_allocate_device(&pdev->dev); 245 if (!axp20x_pek->input) 246 return -ENOMEM; 247 248 idev = axp20x_pek->input; 249 250 idev->name = "axp20x-pek"; 251 idev->phys = "m1kbd/input2"; 252 idev->dev.parent = &pdev->dev; 253 254 input_set_capability(idev, EV_KEY, KEY_POWER); 255 256 input_set_drvdata(idev, axp20x_pek); 257 258 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, 259 axp20x_pek_irq, 0, 260 "axp20x-pek-dbr", idev); 261 if (error < 0) { 262 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", 263 axp20x_pek->irq_dbr, error); 264 return error; 265 } 266 267 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, 268 axp20x_pek_irq, 0, 269 "axp20x-pek-dbf", idev); 270 if (error < 0) { 271 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", 272 axp20x_pek->irq_dbf, error); 273 return error; 274 } 275 276 error = input_register_device(idev); 277 if (error) { 278 dev_err(&pdev->dev, "Can't register input device: %d\n", 279 error); 280 return error; 281 } 282 283 device_init_wakeup(&pdev->dev, true); 284 285 return 0; 286 } 287 288 #ifdef CONFIG_ACPI 289 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 290 struct platform_device *pdev) 291 { 292 unsigned long long hrv = 0; 293 acpi_status status; 294 295 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && 296 axp20x_pek->axp20x->variant == AXP288_ID) { 297 status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent), 298 "_HRV", NULL, &hrv); 299 if (ACPI_FAILURE(status)) 300 dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n"); 301 302 /* 303 * On Cherry Trail platforms (hrv == 3), do not register the 304 * input device if there is an "INTCFD9" or "ACPI0011" gpio 305 * button ACPI device, as that handles the power button too, 306 * and otherwise we end up reporting all presses twice. 307 */ 308 if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) || 309 acpi_dev_present("ACPI0011", NULL, -1))) 310 return false; 311 312 } 313 314 return true; 315 } 316 #else 317 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 318 struct platform_device *pdev) 319 { 320 return true; 321 } 322 #endif 323 324 static int axp20x_pek_probe(struct platform_device *pdev) 325 { 326 struct axp20x_pek *axp20x_pek; 327 const struct platform_device_id *match = platform_get_device_id(pdev); 328 int error; 329 330 if (!match) { 331 dev_err(&pdev->dev, "Failed to get platform_device_id\n"); 332 return -EINVAL; 333 } 334 335 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), 336 GFP_KERNEL); 337 if (!axp20x_pek) 338 return -ENOMEM; 339 340 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); 341 342 if (axp20x_pek_should_register_input(axp20x_pek, pdev)) { 343 error = axp20x_pek_probe_input_device(axp20x_pek, pdev); 344 if (error) 345 return error; 346 } 347 348 axp20x_pek->info = (struct axp20x_info *)match->driver_data; 349 350 platform_set_drvdata(pdev, axp20x_pek); 351 352 return 0; 353 } 354 355 static int __maybe_unused axp20x_pek_suspend(struct device *dev) 356 { 357 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 358 359 /* 360 * As nested threaded IRQs are not automatically disabled during 361 * suspend, we must explicitly disable non-wakeup IRQs. 362 */ 363 if (device_may_wakeup(dev)) { 364 enable_irq_wake(axp20x_pek->irq_dbf); 365 enable_irq_wake(axp20x_pek->irq_dbr); 366 } else { 367 disable_irq(axp20x_pek->irq_dbf); 368 disable_irq(axp20x_pek->irq_dbr); 369 } 370 371 return 0; 372 } 373 374 static int __maybe_unused axp20x_pek_resume(struct device *dev) 375 { 376 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 377 378 if (device_may_wakeup(dev)) { 379 disable_irq_wake(axp20x_pek->irq_dbf); 380 disable_irq_wake(axp20x_pek->irq_dbr); 381 } else { 382 enable_irq(axp20x_pek->irq_dbf); 383 enable_irq(axp20x_pek->irq_dbr); 384 } 385 386 return 0; 387 } 388 389 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev) 390 { 391 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 392 393 if (axp20x_pek->axp20x->variant != AXP288_ID) 394 return 0; 395 396 /* 397 * Clear interrupts from button presses during suspend, to avoid 398 * a wakeup power-button press getting reported to userspace. 399 */ 400 regmap_write(axp20x_pek->axp20x->regmap, 401 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8, 402 BIT(AXP288_IRQ_POKN % 8)); 403 404 return 0; 405 } 406 407 static const struct dev_pm_ops axp20x_pek_pm_ops = { 408 SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume) 409 #ifdef CONFIG_PM_SLEEP 410 .resume_noirq = axp20x_pek_resume_noirq, 411 #endif 412 }; 413 414 static const struct platform_device_id axp_pek_id_match[] = { 415 { 416 .name = "axp20x-pek", 417 .driver_data = (kernel_ulong_t)&axp20x_info, 418 }, 419 { 420 .name = "axp221-pek", 421 .driver_data = (kernel_ulong_t)&axp221_info, 422 }, 423 { /* sentinel */ } 424 }; 425 MODULE_DEVICE_TABLE(platform, axp_pek_id_match); 426 427 static struct platform_driver axp20x_pek_driver = { 428 .probe = axp20x_pek_probe, 429 .id_table = axp_pek_id_match, 430 .driver = { 431 .name = "axp20x-pek", 432 .pm = &axp20x_pek_pm_ops, 433 .dev_groups = axp20x_groups, 434 }, 435 }; 436 module_platform_driver(axp20x_pek_driver); 437 438 MODULE_DESCRIPTION("axp20x Power Button"); 439 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); 440 MODULE_LICENSE("GPL"); 441