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 int ret, i; 137 unsigned int val, idx = 0; 138 unsigned int best_err = UINT_MAX; 139 140 ret = kstrtouint(buf, 10, &val); 141 if (ret) 142 return ret; 143 144 for (i = 3; i >= 0; i--) { 145 unsigned int err; 146 147 err = abs(time[i].time - val); 148 if (err < best_err) { 149 best_err = err; 150 idx = time[i].idx; 151 } 152 153 if (!err) 154 break; 155 } 156 157 idx <<= ffs(mask) - 1; 158 ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, 159 mask, idx); 160 if (ret != 0) 161 return -EINVAL; 162 163 return count; 164 } 165 166 static ssize_t axp20x_store_attr_startup(struct device *dev, 167 struct device_attribute *attr, 168 const char *buf, size_t count) 169 { 170 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 171 172 return axp20x_store_attr(dev, axp20x_pek->info->startup_time, 173 axp20x_pek->info->startup_mask, buf, count); 174 } 175 176 static ssize_t axp20x_store_attr_shutdown(struct device *dev, 177 struct device_attribute *attr, 178 const char *buf, size_t count) 179 { 180 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 181 182 return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time, 183 axp20x_pek->info->shutdown_mask, buf, count); 184 } 185 186 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, 187 axp20x_store_attr_startup); 188 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown, 189 axp20x_store_attr_shutdown); 190 191 static struct attribute *axp20x_attrs[] = { 192 &dev_attr_startup.attr, 193 &dev_attr_shutdown.attr, 194 NULL, 195 }; 196 ATTRIBUTE_GROUPS(axp20x); 197 198 static irqreturn_t axp20x_pek_irq(int irq, void *pwr) 199 { 200 struct input_dev *idev = pwr; 201 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev); 202 203 /* 204 * The power-button is connected to ground so a falling edge (dbf) 205 * means it is pressed. 206 */ 207 if (irq == axp20x_pek->irq_dbf) 208 input_report_key(idev, KEY_POWER, true); 209 else if (irq == axp20x_pek->irq_dbr) 210 input_report_key(idev, KEY_POWER, false); 211 212 input_sync(idev); 213 214 return IRQ_HANDLED; 215 } 216 217 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, 218 struct platform_device *pdev) 219 { 220 struct axp20x_dev *axp20x = axp20x_pek->axp20x; 221 struct input_dev *idev; 222 int error; 223 224 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); 225 if (axp20x_pek->irq_dbr < 0) 226 return axp20x_pek->irq_dbr; 227 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc, 228 axp20x_pek->irq_dbr); 229 230 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); 231 if (axp20x_pek->irq_dbf < 0) 232 return axp20x_pek->irq_dbf; 233 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc, 234 axp20x_pek->irq_dbf); 235 236 axp20x_pek->input = devm_input_allocate_device(&pdev->dev); 237 if (!axp20x_pek->input) 238 return -ENOMEM; 239 240 idev = axp20x_pek->input; 241 242 idev->name = "axp20x-pek"; 243 idev->phys = "m1kbd/input2"; 244 idev->dev.parent = &pdev->dev; 245 246 input_set_capability(idev, EV_KEY, KEY_POWER); 247 248 input_set_drvdata(idev, axp20x_pek); 249 250 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, 251 axp20x_pek_irq, 0, 252 "axp20x-pek-dbr", idev); 253 if (error < 0) { 254 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", 255 axp20x_pek->irq_dbr, error); 256 return error; 257 } 258 259 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, 260 axp20x_pek_irq, 0, 261 "axp20x-pek-dbf", idev); 262 if (error < 0) { 263 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", 264 axp20x_pek->irq_dbf, error); 265 return error; 266 } 267 268 error = input_register_device(idev); 269 if (error) { 270 dev_err(&pdev->dev, "Can't register input device: %d\n", 271 error); 272 return error; 273 } 274 275 device_init_wakeup(&pdev->dev, true); 276 277 return 0; 278 } 279 280 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek) 281 { 282 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && 283 axp20x_pek->axp20x->variant == AXP288_ID) { 284 /* 285 * On Cherry Trail platforms (hrv == 3), do not register the 286 * input device if there is an "INTCFD9" or "ACPI0011" gpio 287 * button ACPI device, as that handles the power button too, 288 * and otherwise we end up reporting all presses twice. 289 */ 290 if (soc_intel_is_cht() && 291 (acpi_dev_present("INTCFD9", NULL, -1) || 292 acpi_dev_present("ACPI0011", NULL, -1))) 293 return false; 294 } 295 296 return true; 297 } 298 299 static int axp20x_pek_probe(struct platform_device *pdev) 300 { 301 struct axp20x_pek *axp20x_pek; 302 const struct platform_device_id *match = platform_get_device_id(pdev); 303 int error; 304 305 if (!match) { 306 dev_err(&pdev->dev, "Failed to get platform_device_id\n"); 307 return -EINVAL; 308 } 309 310 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), 311 GFP_KERNEL); 312 if (!axp20x_pek) 313 return -ENOMEM; 314 315 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); 316 317 if (axp20x_pek_should_register_input(axp20x_pek)) { 318 error = axp20x_pek_probe_input_device(axp20x_pek, pdev); 319 if (error) 320 return error; 321 } 322 323 axp20x_pek->info = (struct axp20x_info *)match->driver_data; 324 325 platform_set_drvdata(pdev, axp20x_pek); 326 327 return 0; 328 } 329 330 static int axp20x_pek_suspend(struct device *dev) 331 { 332 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 333 334 /* 335 * As nested threaded IRQs are not automatically disabled during 336 * suspend, we must explicitly disable non-wakeup IRQs. 337 */ 338 if (device_may_wakeup(dev)) { 339 enable_irq_wake(axp20x_pek->irq_dbf); 340 enable_irq_wake(axp20x_pek->irq_dbr); 341 } else { 342 disable_irq(axp20x_pek->irq_dbf); 343 disable_irq(axp20x_pek->irq_dbr); 344 } 345 346 return 0; 347 } 348 349 static int axp20x_pek_resume(struct device *dev) 350 { 351 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 352 353 if (device_may_wakeup(dev)) { 354 disable_irq_wake(axp20x_pek->irq_dbf); 355 disable_irq_wake(axp20x_pek->irq_dbr); 356 } else { 357 enable_irq(axp20x_pek->irq_dbf); 358 enable_irq(axp20x_pek->irq_dbr); 359 } 360 361 return 0; 362 } 363 364 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev) 365 { 366 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); 367 368 if (axp20x_pek->axp20x->variant != AXP288_ID) 369 return 0; 370 371 /* 372 * Clear interrupts from button presses during suspend, to avoid 373 * a wakeup power-button press getting reported to userspace. 374 */ 375 regmap_write(axp20x_pek->axp20x->regmap, 376 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8, 377 BIT(AXP288_IRQ_POKN % 8)); 378 379 return 0; 380 } 381 382 static const struct dev_pm_ops axp20x_pek_pm_ops = { 383 SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume) 384 .resume_noirq = pm_sleep_ptr(axp20x_pek_resume_noirq), 385 }; 386 387 static const struct platform_device_id axp_pek_id_match[] = { 388 { 389 .name = "axp20x-pek", 390 .driver_data = (kernel_ulong_t)&axp20x_info, 391 }, 392 { 393 .name = "axp221-pek", 394 .driver_data = (kernel_ulong_t)&axp221_info, 395 }, 396 { /* sentinel */ } 397 }; 398 MODULE_DEVICE_TABLE(platform, axp_pek_id_match); 399 400 static struct platform_driver axp20x_pek_driver = { 401 .probe = axp20x_pek_probe, 402 .id_table = axp_pek_id_match, 403 .driver = { 404 .name = "axp20x-pek", 405 .pm = pm_sleep_ptr(&axp20x_pek_pm_ops), 406 .dev_groups = axp20x_groups, 407 }, 408 }; 409 module_platform_driver(axp20x_pek_driver); 410 411 MODULE_DESCRIPTION("axp20x Power Button"); 412 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); 413 MODULE_LICENSE("GPL"); 414