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_data/x86/soc.h> 26 #include <linux/platform_device.h> 27 #include <linux/regmap.h> 28 #include <linux/slab.h> 29 30 #define AXP20X_PEK_STARTUP_MASK (0xc0) 31 #define AXP20X_PEK_SHUTDOWN_MASK (0x03) 32 33 struct axp20x_info { 34 const struct axp20x_time *startup_time; 35 unsigned int startup_mask; 36 const struct axp20x_time *shutdown_time; 37 unsigned int shutdown_mask; 38 }; 39 40 struct axp20x_pek { 41 struct axp20x_dev *axp20x; 42 struct input_dev *input; 43 struct axp20x_info *info; 44 int irq_dbr; 45 int irq_dbf; 46 }; 47 48 struct axp20x_time { 49 unsigned int time; 50 unsigned int idx; 51 }; 52 53 static const struct axp20x_time startup_time[] = { 54 { .time = 128, .idx = 0 }, 55 { .time = 1000, .idx = 2 }, 56 { .time = 3000, .idx = 1 }, 57 { .time = 2000, .idx = 3 }, 58 }; 59 60 static const struct axp20x_time axp221_startup_time[] = { 61 { .time = 128, .idx = 0 }, 62 { .time = 1000, .idx = 1 }, 63 { .time = 2000, .idx = 2 }, 64 { .time = 3000, .idx = 3 }, 65 }; 66 67 static const struct axp20x_time shutdown_time[] = { 68 { .time = 4000, .idx = 0 }, 69 { .time = 6000, .idx = 1 }, 70 { .time = 8000, .idx = 2 }, 71 { .time = 10000, .idx = 3 }, 72 }; 73 74 static const struct axp20x_info axp20x_info = { 75 .startup_time = startup_time, 76 .startup_mask = AXP20X_PEK_STARTUP_MASK, 77 .shutdown_time = shutdown_time, 78 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK, 79 }; 80 81 static const struct axp20x_info axp221_info = { 82 .startup_time = axp221_startup_time, 83 .startup_mask = AXP20X_PEK_STARTUP_MASK, 84 .shutdown_time = shutdown_time, 85 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK, 86 }; 87 88 static ssize_t axp20x_show_attr(struct device *dev, 89 const struct axp20x_time *time, 90 unsigned int mask, char *buf) 91 { 92 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 93 unsigned int val; 94 int ret, i; 95 96 ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val); 97 if (ret != 0) 98 return ret; 99 100 val &= mask; 101 val >>= ffs(mask) - 1; 102 103 for (i = 0; i < 4; i++) 104 if (val == time[i].idx) 105 val = time[i].time; 106 107 return sprintf(buf, "%u\n", val); 108 } 109 110 static ssize_t axp20x_show_attr_startup(struct device *dev, 111 struct device_attribute *attr, 112 char *buf) 113 { 114 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 115 116 return axp20x_show_attr(dev, axp20x_pek->info->startup_time, 117 axp20x_pek->info->startup_mask, buf); 118 } 119 120 static ssize_t axp20x_show_attr_shutdown(struct device *dev, 121 struct device_attribute *attr, 122 char *buf) 123 { 124 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 125 126 return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time, 127 axp20x_pek->info->shutdown_mask, buf); 128 } 129 130 static ssize_t axp20x_store_attr(struct device *dev, 131 const struct axp20x_time *time, 132 unsigned int mask, const char *buf, 133 size_t count) 134 { 135 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 136 char val_str[20]; 137 size_t len; 138 int ret, i; 139 unsigned int val, idx = 0; 140 unsigned int best_err = UINT_MAX; 141 142 val_str[sizeof(val_str) - 1] = '\0'; 143 strncpy(val_str, buf, sizeof(val_str) - 1); 144 len = strlen(val_str); 145 146 if (len && val_str[len - 1] == '\n') 147 val_str[len - 1] = '\0'; 148 149 ret = kstrtouint(val_str, 10, &val); 150 if (ret) 151 return ret; 152 153 for (i = 3; i >= 0; i--) { 154 unsigned int err; 155 156 err = abs(time[i].time - val); 157 if (err < best_err) { 158 best_err = err; 159 idx = time[i].idx; 160 } 161 162 if (!err) 163 break; 164 } 165 166 idx <<= ffs(mask) - 1; 167 ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, 168 mask, idx); 169 if (ret != 0) 170 return -EINVAL; 171 172 return count; 173 } 174 175 static ssize_t axp20x_store_attr_startup(struct device *dev, 176 struct device_attribute *attr, 177 const char *buf, size_t count) 178 { 179 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 180 181 return axp20x_store_attr(dev, axp20x_pek->info->startup_time, 182 axp20x_pek->info->startup_mask, buf, count); 183 } 184 185 static ssize_t axp20x_store_attr_shutdown(struct device *dev, 186 struct device_attribute *attr, 187 const char *buf, size_t count) 188 { 189 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 190 191 return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time, 192 axp20x_pek->info->shutdown_mask, buf, count); 193 } 194 195 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, 196 axp20x_store_attr_startup); 197 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown, 198 axp20x_store_attr_shutdown); 199 200 static struct attribute *axp20x_attrs[] = { 201 &dev_attr_startup.attr, 202 &dev_attr_shutdown.attr, 203 NULL, 204 }; 205 ATTRIBUTE_GROUPS(axp20x); 206 207 static irqreturn_t axp20x_pek_irq(int irq, void *pwr) 208 { 209 struct axp20x_pek *axp20x_pek = pwr; 210 struct input_dev *idev = axp20x_pek->input; 211 212 if (!idev) 213 return IRQ_HANDLED; 214 215 /* 216 * The power-button is connected to ground so a falling edge (dbf) 217 * means it is pressed. 218 */ 219 if (irq == axp20x_pek->irq_dbf) 220 input_report_key(idev, KEY_POWER, true); 221 else if (irq == axp20x_pek->irq_dbr) 222 input_report_key(idev, KEY_POWER, false); 223 224 input_sync(idev); 225 226 return IRQ_HANDLED; 227 } 228 229 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, 230 struct platform_device *pdev) 231 { 232 struct input_dev *idev; 233 int error; 234 235 axp20x_pek->input = devm_input_allocate_device(&pdev->dev); 236 if (!axp20x_pek->input) 237 return -ENOMEM; 238 239 idev = axp20x_pek->input; 240 241 idev->name = "axp20x-pek"; 242 idev->phys = "m1kbd/input2"; 243 idev->dev.parent = &pdev->dev; 244 245 input_set_capability(idev, EV_KEY, KEY_POWER); 246 247 input_set_drvdata(idev, axp20x_pek); 248 249 error = input_register_device(idev); 250 if (error) { 251 dev_err(&pdev->dev, "Can't register input device: %d\n", 252 error); 253 return error; 254 } 255 256 return 0; 257 } 258 259 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek) 260 { 261 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && 262 axp20x_pek->axp20x->variant == AXP288_ID) { 263 /* 264 * On Cherry Trail platforms (hrv == 3), do not register the 265 * input device if there is an "INTCFD9" or "ACPI0011" gpio 266 * button ACPI device, as that handles the power button too, 267 * and otherwise we end up reporting all presses twice. 268 */ 269 if (soc_intel_is_cht() && 270 (acpi_dev_present("INTCFD9", NULL, -1) || 271 acpi_dev_present("ACPI0011", NULL, -1))) 272 return false; 273 } 274 275 return true; 276 } 277 278 static int axp20x_pek_probe(struct platform_device *pdev) 279 { 280 struct axp20x_pek *axp20x_pek; 281 const struct platform_device_id *match = platform_get_device_id(pdev); 282 int error; 283 284 if (!match) { 285 dev_err(&pdev->dev, "Failed to get platform_device_id\n"); 286 return -EINVAL; 287 } 288 289 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), 290 GFP_KERNEL); 291 if (!axp20x_pek) 292 return -ENOMEM; 293 294 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); 295 296 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); 297 if (axp20x_pek->irq_dbr < 0) 298 return axp20x_pek->irq_dbr; 299 axp20x_pek->irq_dbr = regmap_irq_get_virq( 300 axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr); 301 302 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); 303 if (axp20x_pek->irq_dbf < 0) 304 return axp20x_pek->irq_dbf; 305 axp20x_pek->irq_dbf = regmap_irq_get_virq( 306 axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf); 307 308 if (axp20x_pek_should_register_input(axp20x_pek)) { 309 error = axp20x_pek_probe_input_device(axp20x_pek, pdev); 310 if (error) 311 return error; 312 } 313 314 axp20x_pek->info = (struct axp20x_info *)match->driver_data; 315 316 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, 317 axp20x_pek_irq, 0, 318 "axp20x-pek-dbr", axp20x_pek); 319 if (error < 0) { 320 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", 321 axp20x_pek->irq_dbr, error); 322 return error; 323 } 324 325 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, 326 axp20x_pek_irq, 0, 327 "axp20x-pek-dbf", axp20x_pek); 328 if (error < 0) { 329 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", 330 axp20x_pek->irq_dbf, error); 331 return error; 332 } 333 334 device_init_wakeup(&pdev->dev, true); 335 336 platform_set_drvdata(pdev, axp20x_pek); 337 338 return 0; 339 } 340 341 static int __maybe_unused axp20x_pek_suspend(struct device *dev) 342 { 343 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 344 345 /* 346 * As nested threaded IRQs are not automatically disabled during 347 * suspend, we must explicitly disable non-wakeup IRQs. 348 */ 349 if (device_may_wakeup(dev)) { 350 enable_irq_wake(axp20x_pek->irq_dbf); 351 enable_irq_wake(axp20x_pek->irq_dbr); 352 } else { 353 disable_irq(axp20x_pek->irq_dbf); 354 disable_irq(axp20x_pek->irq_dbr); 355 } 356 357 return 0; 358 } 359 360 static int __maybe_unused axp20x_pek_resume(struct device *dev) 361 { 362 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 363 364 if (device_may_wakeup(dev)) { 365 disable_irq_wake(axp20x_pek->irq_dbf); 366 disable_irq_wake(axp20x_pek->irq_dbr); 367 } else { 368 enable_irq(axp20x_pek->irq_dbf); 369 enable_irq(axp20x_pek->irq_dbr); 370 } 371 372 return 0; 373 } 374 375 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev) 376 { 377 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 378 379 if (axp20x_pek->axp20x->variant != AXP288_ID) 380 return 0; 381 382 /* 383 * Clear interrupts from button presses during suspend, to avoid 384 * a wakeup power-button press getting reported to userspace. 385 */ 386 regmap_write(axp20x_pek->axp20x->regmap, 387 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8, 388 BIT(AXP288_IRQ_POKN % 8)); 389 390 return 0; 391 } 392 393 static const struct dev_pm_ops axp20x_pek_pm_ops = { 394 SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume) 395 #ifdef CONFIG_PM_SLEEP 396 .resume_noirq = axp20x_pek_resume_noirq, 397 #endif 398 }; 399 400 static const struct platform_device_id axp_pek_id_match[] = { 401 { 402 .name = "axp20x-pek", 403 .driver_data = (kernel_ulong_t)&axp20x_info, 404 }, 405 { 406 .name = "axp221-pek", 407 .driver_data = (kernel_ulong_t)&axp221_info, 408 }, 409 { /* sentinel */ } 410 }; 411 MODULE_DEVICE_TABLE(platform, axp_pek_id_match); 412 413 static struct platform_driver axp20x_pek_driver = { 414 .probe = axp20x_pek_probe, 415 .id_table = axp_pek_id_match, 416 .driver = { 417 .name = "axp20x-pek", 418 .pm = &axp20x_pek_pm_ops, 419 .dev_groups = axp20x_groups, 420 }, 421 }; 422 module_platform_driver(axp20x_pek_driver); 423 424 MODULE_DESCRIPTION("axp20x Power Button"); 425 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); 426 MODULE_LICENSE("GPL"); 427