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 DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, axp20x_store_attr_startup); 195 DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown, 196 axp20x_store_attr_shutdown); 197 198 static struct attribute *axp20x_attributes[] = { 199 &dev_attr_startup.attr, 200 &dev_attr_shutdown.attr, 201 NULL, 202 }; 203 204 static const struct attribute_group axp20x_attribute_group = { 205 .attrs = axp20x_attributes, 206 }; 207 208 static irqreturn_t axp20x_pek_irq(int irq, void *pwr) 209 { 210 struct input_dev *idev = pwr; 211 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev); 212 213 /* 214 * The power-button is connected to ground so a falling edge (dbf) 215 * means it is pressed. 216 */ 217 if (irq == axp20x_pek->irq_dbf) 218 input_report_key(idev, KEY_POWER, true); 219 else if (irq == axp20x_pek->irq_dbr) 220 input_report_key(idev, KEY_POWER, false); 221 222 input_sync(idev); 223 224 return IRQ_HANDLED; 225 } 226 227 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, 228 struct platform_device *pdev) 229 { 230 struct axp20x_dev *axp20x = axp20x_pek->axp20x; 231 struct input_dev *idev; 232 int error; 233 234 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); 235 if (axp20x_pek->irq_dbr < 0) { 236 dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n", 237 axp20x_pek->irq_dbr); 238 return axp20x_pek->irq_dbr; 239 } 240 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc, 241 axp20x_pek->irq_dbr); 242 243 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); 244 if (axp20x_pek->irq_dbf < 0) { 245 dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n", 246 axp20x_pek->irq_dbf); 247 return axp20x_pek->irq_dbf; 248 } 249 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc, 250 axp20x_pek->irq_dbf); 251 252 axp20x_pek->input = devm_input_allocate_device(&pdev->dev); 253 if (!axp20x_pek->input) 254 return -ENOMEM; 255 256 idev = axp20x_pek->input; 257 258 idev->name = "axp20x-pek"; 259 idev->phys = "m1kbd/input2"; 260 idev->dev.parent = &pdev->dev; 261 262 input_set_capability(idev, EV_KEY, KEY_POWER); 263 264 input_set_drvdata(idev, axp20x_pek); 265 266 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, 267 axp20x_pek_irq, 0, 268 "axp20x-pek-dbr", idev); 269 if (error < 0) { 270 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", 271 axp20x_pek->irq_dbr, error); 272 return error; 273 } 274 275 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, 276 axp20x_pek_irq, 0, 277 "axp20x-pek-dbf", idev); 278 if (error < 0) { 279 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", 280 axp20x_pek->irq_dbf, error); 281 return error; 282 } 283 284 error = input_register_device(idev); 285 if (error) { 286 dev_err(&pdev->dev, "Can't register input device: %d\n", 287 error); 288 return error; 289 } 290 291 if (axp20x_pek->axp20x->variant == AXP288_ID) 292 enable_irq_wake(axp20x_pek->irq_dbr); 293 294 return 0; 295 } 296 297 #ifdef CONFIG_ACPI 298 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 299 struct platform_device *pdev) 300 { 301 unsigned long long hrv = 0; 302 acpi_status status; 303 304 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && 305 axp20x_pek->axp20x->variant == AXP288_ID) { 306 status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent), 307 "_HRV", NULL, &hrv); 308 if (ACPI_FAILURE(status)) 309 dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n"); 310 311 /* 312 * On Cherry Trail platforms (hrv == 3), do not register the 313 * input device if there is an "INTCFD9" or "ACPI0011" gpio 314 * button ACPI device, as that handles the power button too, 315 * and otherwise we end up reporting all presses twice. 316 */ 317 if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) || 318 acpi_dev_present("ACPI0011", NULL, -1))) 319 return false; 320 321 } 322 323 return true; 324 } 325 #else 326 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, 327 struct platform_device *pdev) 328 { 329 return true; 330 } 331 #endif 332 333 static int axp20x_pek_probe(struct platform_device *pdev) 334 { 335 struct axp20x_pek *axp20x_pek; 336 const struct platform_device_id *match = platform_get_device_id(pdev); 337 int error; 338 339 if (!match) { 340 dev_err(&pdev->dev, "Failed to get platform_device_id\n"); 341 return -EINVAL; 342 } 343 344 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), 345 GFP_KERNEL); 346 if (!axp20x_pek) 347 return -ENOMEM; 348 349 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); 350 351 if (axp20x_pek_should_register_input(axp20x_pek, pdev)) { 352 error = axp20x_pek_probe_input_device(axp20x_pek, pdev); 353 if (error) 354 return error; 355 } 356 357 axp20x_pek->info = (struct axp20x_info *)match->driver_data; 358 359 error = devm_device_add_group(&pdev->dev, &axp20x_attribute_group); 360 if (error) { 361 dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n", 362 error); 363 return error; 364 } 365 366 platform_set_drvdata(pdev, axp20x_pek); 367 368 return 0; 369 } 370 371 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev) 372 { 373 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 374 375 if (axp20x_pek->axp20x->variant != AXP288_ID) 376 return 0; 377 378 /* 379 * Clear interrupts from button presses during suspend, to avoid 380 * a wakeup power-button press getting reported to userspace. 381 */ 382 regmap_write(axp20x_pek->axp20x->regmap, 383 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8, 384 BIT(AXP288_IRQ_POKN % 8)); 385 386 return 0; 387 } 388 389 static const struct dev_pm_ops axp20x_pek_pm_ops = { 390 #ifdef CONFIG_PM_SLEEP 391 .resume_noirq = axp20x_pek_resume_noirq, 392 #endif 393 }; 394 395 static const struct platform_device_id axp_pek_id_match[] = { 396 { 397 .name = "axp20x-pek", 398 .driver_data = (kernel_ulong_t)&axp20x_info, 399 }, 400 { 401 .name = "axp221-pek", 402 .driver_data = (kernel_ulong_t)&axp221_info, 403 }, 404 { /* sentinel */ } 405 }; 406 MODULE_DEVICE_TABLE(platform, axp_pek_id_match); 407 408 static struct platform_driver axp20x_pek_driver = { 409 .probe = axp20x_pek_probe, 410 .id_table = axp_pek_id_match, 411 .driver = { 412 .name = "axp20x-pek", 413 .pm = &axp20x_pek_pm_ops, 414 }, 415 }; 416 module_platform_driver(axp20x_pek_driver); 417 418 MODULE_DESCRIPTION("axp20x Power Button"); 419 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); 420 MODULE_LICENSE("GPL"); 421