Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Driver for keys on GPIO lines capable of generating interrupts. |
| 3 | * |
| 4 | * Copyright 2005 Phil Blundell |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 5 | * Copyright 2010, 2011 David Jander <david@protonic.nl> |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 13 | |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/irq.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/pm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 21 | #include <linux/sysctl.h> |
| 22 | #include <linux/proc_fs.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/input.h> |
David Brownell | 49015be | 2007-03-05 00:30:22 -0800 | [diff] [blame] | 26 | #include <linux/gpio_keys.h> |
Jani Nikula | da0d03f | 2009-06-28 22:38:56 -0700 | [diff] [blame] | 27 | #include <linux/workqueue.h> |
Ben Dooks | 111bc59 | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 28 | #include <linux/gpio.h> |
Sachin Kamat | 415a4ca | 2013-10-06 00:55:14 -0700 | [diff] [blame] | 29 | #include <linux/of.h> |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 30 | #include <linux/of_platform.h> |
| 31 | #include <linux/of_gpio.h> |
Alexander Stein | f2d347f | 2014-11-25 11:53:45 -0800 | [diff] [blame] | 32 | #include <linux/of_irq.h> |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 33 | #include <linux/spinlock.h> |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 34 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 35 | struct gpio_button_data { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 36 | const struct gpio_keys_button *button; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 37 | struct input_dev *input; |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 38 | |
| 39 | struct timer_list release_timer; |
| 40 | unsigned int release_delay; /* in msecs, for IRQ-only buttons */ |
| 41 | |
| 42 | struct delayed_work work; |
| 43 | unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */ |
| 44 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 45 | unsigned int irq; |
| 46 | spinlock_t lock; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 47 | bool disabled; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 48 | bool key_pressed; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 49 | }; |
| 50 | |
| 51 | struct gpio_keys_drvdata { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 52 | const struct gpio_keys_platform_data *pdata; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 53 | struct input_dev *input; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 54 | struct mutex disable_lock; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 55 | struct gpio_button_data data[0]; |
| 56 | }; |
| 57 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 58 | /* |
| 59 | * SYSFS interface for enabling/disabling keys and switches: |
| 60 | * |
| 61 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ |
| 62 | * keys [ro] - bitmap of keys (EV_KEY) which can be |
| 63 | * disabled |
| 64 | * switches [ro] - bitmap of switches (EV_SW) which can be |
| 65 | * disabled |
| 66 | * disabled_keys [rw] - bitmap of keys currently disabled |
| 67 | * disabled_switches [rw] - bitmap of switches currently disabled |
| 68 | * |
| 69 | * Userland can change these values and hence disable event generation |
| 70 | * for each key (or switch). Disabling a key means its interrupt line |
| 71 | * is disabled. |
| 72 | * |
| 73 | * For example, if we have following switches set up as gpio-keys: |
| 74 | * SW_DOCK = 5 |
| 75 | * SW_CAMERA_LENS_COVER = 9 |
| 76 | * SW_KEYPAD_SLIDE = 10 |
| 77 | * SW_FRONT_PROXIMITY = 11 |
| 78 | * This is read from switches: |
| 79 | * 11-9,5 |
| 80 | * Next we want to disable proximity (11) and dock (5), we write: |
| 81 | * 11,5 |
| 82 | * to file disabled_switches. Now proximity and dock IRQs are disabled. |
| 83 | * This can be verified by reading the file disabled_switches: |
| 84 | * 11,5 |
| 85 | * If we now want to enable proximity (11) switch we write: |
| 86 | * 5 |
| 87 | * to disabled_switches. |
| 88 | * |
| 89 | * We can disable only those keys which don't allow sharing the irq. |
| 90 | */ |
| 91 | |
| 92 | /** |
| 93 | * get_n_events_by_type() - returns maximum number of events per @type |
| 94 | * @type: type of button (%EV_KEY, %EV_SW) |
| 95 | * |
| 96 | * Return value of this function can be used to allocate bitmap |
| 97 | * large enough to hold all bits for given type. |
| 98 | */ |
| 99 | static inline int get_n_events_by_type(int type) |
| 100 | { |
| 101 | BUG_ON(type != EV_SW && type != EV_KEY); |
| 102 | |
| 103 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * gpio_keys_disable_button() - disables given GPIO button |
| 108 | * @bdata: button data for button to be disabled |
| 109 | * |
| 110 | * Disables button pointed by @bdata. This is done by masking |
| 111 | * IRQ line. After this function is called, button won't generate |
| 112 | * input events anymore. Note that one can only disable buttons |
| 113 | * that don't share IRQs. |
| 114 | * |
| 115 | * Make sure that @bdata->disable_lock is locked when entering |
| 116 | * this function to avoid races when concurrent threads are |
| 117 | * disabling buttons at the same time. |
| 118 | */ |
| 119 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) |
| 120 | { |
| 121 | if (!bdata->disabled) { |
| 122 | /* |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 123 | * Disable IRQ and associated timer/work structure. |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 124 | */ |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 125 | disable_irq(bdata->irq); |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 126 | |
| 127 | if (gpio_is_valid(bdata->button->gpio)) |
| 128 | cancel_delayed_work_sync(&bdata->work); |
| 129 | else |
| 130 | del_timer_sync(&bdata->release_timer); |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 131 | |
| 132 | bdata->disabled = true; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * gpio_keys_enable_button() - enables given GPIO button |
| 138 | * @bdata: button data for button to be disabled |
| 139 | * |
| 140 | * Enables given button pointed by @bdata. |
| 141 | * |
| 142 | * Make sure that @bdata->disable_lock is locked when entering |
| 143 | * this function to avoid races with concurrent threads trying |
| 144 | * to enable the same button at the same time. |
| 145 | */ |
| 146 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) |
| 147 | { |
| 148 | if (bdata->disabled) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 149 | enable_irq(bdata->irq); |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 150 | bdata->disabled = false; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons |
| 156 | * @ddata: pointer to drvdata |
| 157 | * @buf: buffer where stringified bitmap is written |
| 158 | * @type: button type (%EV_KEY, %EV_SW) |
| 159 | * @only_disabled: does caller want only those buttons that are |
| 160 | * currently disabled or all buttons that can be |
| 161 | * disabled |
| 162 | * |
| 163 | * This function writes buttons that can be disabled to @buf. If |
| 164 | * @only_disabled is true, then @buf contains only those buttons |
| 165 | * that are currently disabled. Returns 0 on success or negative |
| 166 | * errno on failure. |
| 167 | */ |
| 168 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, |
| 169 | char *buf, unsigned int type, |
| 170 | bool only_disabled) |
| 171 | { |
| 172 | int n_events = get_n_events_by_type(type); |
| 173 | unsigned long *bits; |
| 174 | ssize_t ret; |
| 175 | int i; |
| 176 | |
| 177 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 178 | if (!bits) |
| 179 | return -ENOMEM; |
| 180 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 181 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 182 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 183 | |
| 184 | if (bdata->button->type != type) |
| 185 | continue; |
| 186 | |
| 187 | if (only_disabled && !bdata->disabled) |
| 188 | continue; |
| 189 | |
| 190 | __set_bit(bdata->button->code, bits); |
| 191 | } |
| 192 | |
Tejun Heo | 0b48003 | 2015-02-13 14:37:48 -0800 | [diff] [blame] | 193 | ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits); |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 194 | buf[ret++] = '\n'; |
| 195 | buf[ret] = '\0'; |
| 196 | |
| 197 | kfree(bits); |
| 198 | |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap |
| 204 | * @ddata: pointer to drvdata |
| 205 | * @buf: buffer from userspace that contains stringified bitmap |
| 206 | * @type: button type (%EV_KEY, %EV_SW) |
| 207 | * |
| 208 | * This function parses stringified bitmap from @buf and disables/enables |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 209 | * GPIO buttons accordingly. Returns 0 on success and negative error |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 210 | * on failure. |
| 211 | */ |
| 212 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, |
| 213 | const char *buf, unsigned int type) |
| 214 | { |
| 215 | int n_events = get_n_events_by_type(type); |
| 216 | unsigned long *bits; |
| 217 | ssize_t error; |
| 218 | int i; |
| 219 | |
| 220 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 221 | if (!bits) |
| 222 | return -ENOMEM; |
| 223 | |
| 224 | error = bitmap_parselist(buf, bits, n_events); |
| 225 | if (error) |
| 226 | goto out; |
| 227 | |
| 228 | /* First validate */ |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 229 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 230 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 231 | |
| 232 | if (bdata->button->type != type) |
| 233 | continue; |
| 234 | |
| 235 | if (test_bit(bdata->button->code, bits) && |
| 236 | !bdata->button->can_disable) { |
| 237 | error = -EINVAL; |
| 238 | goto out; |
| 239 | } |
| 240 | } |
| 241 | |
Peng Fan | 4ea14a5 | 2015-08-24 10:42:25 -0700 | [diff] [blame] | 242 | if (i == ddata->pdata->nbuttons) { |
| 243 | error = -EINVAL; |
| 244 | goto out; |
| 245 | } |
| 246 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 247 | mutex_lock(&ddata->disable_lock); |
| 248 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 249 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 250 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 251 | |
| 252 | if (bdata->button->type != type) |
| 253 | continue; |
| 254 | |
| 255 | if (test_bit(bdata->button->code, bits)) |
| 256 | gpio_keys_disable_button(bdata); |
| 257 | else |
| 258 | gpio_keys_enable_button(bdata); |
| 259 | } |
| 260 | |
| 261 | mutex_unlock(&ddata->disable_lock); |
| 262 | |
| 263 | out: |
| 264 | kfree(bits); |
| 265 | return error; |
| 266 | } |
| 267 | |
| 268 | #define ATTR_SHOW_FN(name, type, only_disabled) \ |
| 269 | static ssize_t gpio_keys_show_##name(struct device *dev, \ |
| 270 | struct device_attribute *attr, \ |
| 271 | char *buf) \ |
| 272 | { \ |
| 273 | struct platform_device *pdev = to_platform_device(dev); \ |
| 274 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 275 | \ |
| 276 | return gpio_keys_attr_show_helper(ddata, buf, \ |
| 277 | type, only_disabled); \ |
| 278 | } |
| 279 | |
| 280 | ATTR_SHOW_FN(keys, EV_KEY, false); |
| 281 | ATTR_SHOW_FN(switches, EV_SW, false); |
| 282 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); |
| 283 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); |
| 284 | |
| 285 | /* |
| 286 | * ATTRIBUTES: |
| 287 | * |
| 288 | * /sys/devices/platform/gpio-keys/keys [ro] |
| 289 | * /sys/devices/platform/gpio-keys/switches [ro] |
| 290 | */ |
| 291 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); |
| 292 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); |
| 293 | |
| 294 | #define ATTR_STORE_FN(name, type) \ |
| 295 | static ssize_t gpio_keys_store_##name(struct device *dev, \ |
| 296 | struct device_attribute *attr, \ |
| 297 | const char *buf, \ |
| 298 | size_t count) \ |
| 299 | { \ |
| 300 | struct platform_device *pdev = to_platform_device(dev); \ |
| 301 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 302 | ssize_t error; \ |
| 303 | \ |
| 304 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ |
| 305 | if (error) \ |
| 306 | return error; \ |
| 307 | \ |
| 308 | return count; \ |
| 309 | } |
| 310 | |
| 311 | ATTR_STORE_FN(disabled_keys, EV_KEY); |
| 312 | ATTR_STORE_FN(disabled_switches, EV_SW); |
| 313 | |
| 314 | /* |
| 315 | * ATTRIBUTES: |
| 316 | * |
| 317 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] |
| 318 | * /sys/devices/platform/gpio-keys/disables_switches [rw] |
| 319 | */ |
| 320 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, |
| 321 | gpio_keys_show_disabled_keys, |
| 322 | gpio_keys_store_disabled_keys); |
| 323 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, |
| 324 | gpio_keys_show_disabled_switches, |
| 325 | gpio_keys_store_disabled_switches); |
| 326 | |
| 327 | static struct attribute *gpio_keys_attrs[] = { |
| 328 | &dev_attr_keys.attr, |
| 329 | &dev_attr_switches.attr, |
| 330 | &dev_attr_disabled_keys.attr, |
| 331 | &dev_attr_disabled_switches.attr, |
| 332 | NULL, |
| 333 | }; |
| 334 | |
| 335 | static struct attribute_group gpio_keys_attr_group = { |
| 336 | .attrs = gpio_keys_attrs, |
| 337 | }; |
| 338 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 339 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 340 | { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 341 | const struct gpio_keys_button *button = bdata->button; |
Uwe Kleine-König | ce25d7e | 2008-08-08 12:14:36 -0400 | [diff] [blame] | 342 | struct input_dev *input = bdata->input; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 343 | unsigned int type = button->type ?: EV_KEY; |
Bjorn Andersson | 77fa055 | 2015-10-02 10:44:00 -0700 | [diff] [blame] | 344 | int state = gpio_get_value_cansleep(button->gpio); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 345 | |
Bjorn Andersson | 77fa055 | 2015-10-02 10:44:00 -0700 | [diff] [blame] | 346 | if (state < 0) { |
| 347 | dev_err(input->dev.parent, "failed to get gpio state\n"); |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | state = (state ? 1 : 0) ^ button->active_low; |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 352 | if (type == EV_ABS) { |
| 353 | if (state) |
| 354 | input_event(input, type, button->code, button->value); |
| 355 | } else { |
| 356 | input_event(input, type, button->code, !!state); |
| 357 | } |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 358 | input_sync(input); |
| 359 | } |
| 360 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 361 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 362 | { |
| 363 | struct gpio_button_data *bdata = |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 364 | container_of(work, struct gpio_button_data, work.work); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 365 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 366 | gpio_keys_gpio_report_event(bdata); |
NeilBrown | 2fba26c | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 367 | |
| 368 | if (bdata->button->wakeup) |
| 369 | pm_relax(bdata->input->dev.parent); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 370 | } |
| 371 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 372 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 373 | { |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 374 | struct gpio_button_data *bdata = dev_id; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 375 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 376 | BUG_ON(irq != bdata->irq); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 377 | |
NeilBrown | 2fba26c | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 378 | if (bdata->button->wakeup) |
| 379 | pm_stay_awake(bdata->input->dev.parent); |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 380 | |
| 381 | mod_delayed_work(system_wq, |
| 382 | &bdata->work, |
| 383 | msecs_to_jiffies(bdata->software_debounce)); |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 384 | |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 385 | return IRQ_HANDLED; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 386 | } |
| 387 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 388 | static void gpio_keys_irq_timer(unsigned long _data) |
| 389 | { |
| 390 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
| 391 | struct input_dev *input = bdata->input; |
| 392 | unsigned long flags; |
| 393 | |
| 394 | spin_lock_irqsave(&bdata->lock, flags); |
| 395 | if (bdata->key_pressed) { |
| 396 | input_event(input, EV_KEY, bdata->button->code, 0); |
| 397 | input_sync(input); |
| 398 | bdata->key_pressed = false; |
| 399 | } |
| 400 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 401 | } |
| 402 | |
| 403 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) |
| 404 | { |
| 405 | struct gpio_button_data *bdata = dev_id; |
| 406 | const struct gpio_keys_button *button = bdata->button; |
| 407 | struct input_dev *input = bdata->input; |
| 408 | unsigned long flags; |
| 409 | |
| 410 | BUG_ON(irq != bdata->irq); |
| 411 | |
| 412 | spin_lock_irqsave(&bdata->lock, flags); |
| 413 | |
| 414 | if (!bdata->key_pressed) { |
NeilBrown | 2fba26c | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 415 | if (bdata->button->wakeup) |
| 416 | pm_wakeup_event(bdata->input->dev.parent, 0); |
| 417 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 418 | input_event(input, EV_KEY, button->code, 1); |
| 419 | input_sync(input); |
| 420 | |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 421 | if (!bdata->release_delay) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 422 | input_event(input, EV_KEY, button->code, 0); |
| 423 | input_sync(input); |
| 424 | goto out; |
| 425 | } |
| 426 | |
| 427 | bdata->key_pressed = true; |
| 428 | } |
| 429 | |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 430 | if (bdata->release_delay) |
| 431 | mod_timer(&bdata->release_timer, |
| 432 | jiffies + msecs_to_jiffies(bdata->release_delay)); |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 433 | out: |
| 434 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 435 | return IRQ_HANDLED; |
| 436 | } |
| 437 | |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 438 | static void gpio_keys_quiesce_key(void *data) |
| 439 | { |
| 440 | struct gpio_button_data *bdata = data; |
| 441 | |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 442 | if (gpio_is_valid(bdata->button->gpio)) |
| 443 | cancel_delayed_work_sync(&bdata->work); |
| 444 | else |
| 445 | del_timer_sync(&bdata->release_timer); |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 448 | static int gpio_keys_setup_key(struct platform_device *pdev, |
| 449 | struct input_dev *input, |
| 450 | struct gpio_button_data *bdata, |
| 451 | const struct gpio_keys_button *button) |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 452 | { |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 453 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 454 | struct device *dev = &pdev->dev; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 455 | irq_handler_t isr; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 456 | unsigned long irqflags; |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 457 | int irq; |
| 458 | int error; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 459 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 460 | bdata->input = input; |
| 461 | bdata->button = button; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 462 | spin_lock_init(&bdata->lock); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 463 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 464 | if (gpio_is_valid(button->gpio)) { |
| 465 | |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 466 | error = devm_gpio_request_one(&pdev->dev, button->gpio, |
| 467 | GPIOF_IN, desc); |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 468 | if (error < 0) { |
| 469 | dev_err(dev, "Failed to request GPIO %d, error %d\n", |
| 470 | button->gpio, error); |
| 471 | return error; |
| 472 | } |
| 473 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 474 | if (button->debounce_interval) { |
| 475 | error = gpio_set_debounce(button->gpio, |
| 476 | button->debounce_interval * 1000); |
| 477 | /* use timer if gpiolib doesn't provide debounce */ |
| 478 | if (error < 0) |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 479 | bdata->software_debounce = |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 480 | button->debounce_interval; |
| 481 | } |
| 482 | |
Dmitry Torokhov | 97d86e0 | 2014-11-14 15:57:09 -0800 | [diff] [blame] | 483 | if (button->irq) { |
| 484 | bdata->irq = button->irq; |
| 485 | } else { |
| 486 | irq = gpio_to_irq(button->gpio); |
| 487 | if (irq < 0) { |
| 488 | error = irq; |
| 489 | dev_err(dev, |
| 490 | "Unable to get irq number for GPIO %d, error %d\n", |
| 491 | button->gpio, error); |
| 492 | return error; |
| 493 | } |
| 494 | bdata->irq = irq; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 495 | } |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 496 | |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 497 | INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func); |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 498 | |
| 499 | isr = gpio_keys_gpio_isr; |
| 500 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; |
| 501 | |
| 502 | } else { |
| 503 | if (!button->irq) { |
| 504 | dev_err(dev, "No IRQ specified\n"); |
| 505 | return -EINVAL; |
| 506 | } |
| 507 | bdata->irq = button->irq; |
| 508 | |
| 509 | if (button->type && button->type != EV_KEY) { |
| 510 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); |
| 511 | return -EINVAL; |
| 512 | } |
| 513 | |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 514 | bdata->release_delay = button->debounce_interval; |
| 515 | setup_timer(&bdata->release_timer, |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 516 | gpio_keys_irq_timer, (unsigned long)bdata); |
| 517 | |
| 518 | isr = gpio_keys_irq_isr; |
| 519 | irqflags = 0; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 520 | } |
| 521 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 522 | input_set_capability(input, button->type ?: EV_KEY, button->code); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 523 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 524 | /* |
Dmitry Torokhov | 8ed9255 | 2014-11-14 17:32:01 -0800 | [diff] [blame] | 525 | * Install custom action to cancel release timer and |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 526 | * workqueue item. |
| 527 | */ |
| 528 | error = devm_add_action(&pdev->dev, gpio_keys_quiesce_key, bdata); |
| 529 | if (error) { |
| 530 | dev_err(&pdev->dev, |
| 531 | "failed to register quiesce action, error: %d\n", |
| 532 | error); |
| 533 | return error; |
| 534 | } |
| 535 | |
| 536 | /* |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 537 | * If platform has specified that the button can be disabled, |
| 538 | * we don't want it to share the interrupt line. |
| 539 | */ |
| 540 | if (!button->can_disable) |
| 541 | irqflags |= IRQF_SHARED; |
| 542 | |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 543 | error = devm_request_any_context_irq(&pdev->dev, bdata->irq, |
| 544 | isr, irqflags, desc, bdata); |
Philippe Langlais | 94a8cab | 2011-01-20 23:09:30 -0800 | [diff] [blame] | 545 | if (error < 0) { |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 546 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 547 | bdata->irq, error); |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 548 | return error; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | return 0; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 552 | } |
| 553 | |
Dmitry Torokhov | 5b76d7b | 2012-11-24 01:22:43 -0800 | [diff] [blame] | 554 | static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata) |
| 555 | { |
| 556 | struct input_dev *input = ddata->input; |
| 557 | int i; |
| 558 | |
| 559 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
| 560 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 561 | if (gpio_is_valid(bdata->button->gpio)) |
| 562 | gpio_keys_gpio_report_event(bdata); |
| 563 | } |
| 564 | input_sync(input); |
| 565 | } |
| 566 | |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 567 | static int gpio_keys_open(struct input_dev *input) |
| 568 | { |
| 569 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 570 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
Dmitry Torokhov | 5b76d7b | 2012-11-24 01:22:43 -0800 | [diff] [blame] | 571 | int error; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 572 | |
Dmitry Torokhov | 5b76d7b | 2012-11-24 01:22:43 -0800 | [diff] [blame] | 573 | if (pdata->enable) { |
| 574 | error = pdata->enable(input->dev.parent); |
| 575 | if (error) |
| 576 | return error; |
| 577 | } |
| 578 | |
| 579 | /* Report current state of buttons that are connected to GPIOs */ |
| 580 | gpio_keys_report_state(ddata); |
| 581 | |
| 582 | return 0; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 583 | } |
| 584 | |
| 585 | static void gpio_keys_close(struct input_dev *input) |
| 586 | { |
| 587 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 588 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 589 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 590 | if (pdata->disable) |
| 591 | pdata->disable(input->dev.parent); |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 592 | } |
| 593 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 594 | /* |
| 595 | * Handlers for alternative sources of platform_data |
| 596 | */ |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 597 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 598 | #ifdef CONFIG_OF |
| 599 | /* |
| 600 | * Translate OpenFirmware node properties into platform_data |
| 601 | */ |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 602 | static struct gpio_keys_platform_data * |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 603 | gpio_keys_get_devtree_pdata(struct device *dev) |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 604 | { |
| 605 | struct device_node *node, *pp; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 606 | struct gpio_keys_platform_data *pdata; |
| 607 | struct gpio_keys_button *button; |
| 608 | int error; |
| 609 | int nbuttons; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 610 | int i; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 611 | |
| 612 | node = dev->of_node; |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 613 | if (!node) |
| 614 | return ERR_PTR(-ENODEV); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 615 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 616 | nbuttons = of_get_child_count(node); |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 617 | if (nbuttons == 0) |
| 618 | return ERR_PTR(-ENODEV); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 619 | |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 620 | pdata = devm_kzalloc(dev, |
| 621 | sizeof(*pdata) + nbuttons * sizeof(*button), |
| 622 | GFP_KERNEL); |
| 623 | if (!pdata) |
| 624 | return ERR_PTR(-ENOMEM); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 625 | |
| 626 | pdata->buttons = (struct gpio_keys_button *)(pdata + 1); |
| 627 | pdata->nbuttons = nbuttons; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 628 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 629 | pdata->rep = !!of_get_property(node, "autorepeat", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 630 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 631 | i = 0; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 632 | for_each_child_of_node(node, pp) { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 633 | enum of_gpio_flags flags; |
| 634 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 635 | button = &pdata->buttons[i++]; |
| 636 | |
Dmitry Torokhov | 97d86e0 | 2014-11-14 15:57:09 -0800 | [diff] [blame] | 637 | button->gpio = of_get_gpio_flags(pp, 0, &flags); |
| 638 | if (button->gpio < 0) { |
| 639 | error = button->gpio; |
| 640 | if (error != -ENOENT) { |
Alexander Stein | f2d347f | 2014-11-25 11:53:45 -0800 | [diff] [blame] | 641 | if (error != -EPROBE_DEFER) |
| 642 | dev_err(dev, |
| 643 | "Failed to get gpio flags, error: %d\n", |
| 644 | error); |
| 645 | return ERR_PTR(error); |
| 646 | } |
Dmitry Torokhov | 97d86e0 | 2014-11-14 15:57:09 -0800 | [diff] [blame] | 647 | } else { |
| 648 | button->active_low = flags & OF_GPIO_ACTIVE_LOW; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 649 | } |
| 650 | |
Dmitry Torokhov | 97d86e0 | 2014-11-14 15:57:09 -0800 | [diff] [blame] | 651 | button->irq = irq_of_parse_and_map(pp, 0); |
| 652 | |
| 653 | if (!gpio_is_valid(button->gpio) && !button->irq) { |
| 654 | dev_err(dev, "Found button without gpios or irqs\n"); |
| 655 | return ERR_PTR(-EINVAL); |
| 656 | } |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 657 | |
| 658 | if (of_property_read_u32(pp, "linux,code", &button->code)) { |
| 659 | dev_err(dev, "Button without keycode: 0x%x\n", |
| 660 | button->gpio); |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 661 | return ERR_PTR(-EINVAL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 662 | } |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 663 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 664 | button->desc = of_get_property(pp, "label", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 665 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 666 | if (of_property_read_u32(pp, "linux,input-type", &button->type)) |
| 667 | button->type = EV_KEY; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 668 | |
Dmitry Torokhov | 99b4ffb | 2015-07-16 12:10:05 -0700 | [diff] [blame] | 669 | button->wakeup = of_property_read_bool(pp, "wakeup-source") || |
| 670 | /* legacy name */ |
| 671 | of_property_read_bool(pp, "gpio-key,wakeup"); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 672 | |
Dmitry Torokhov | 97d86e0 | 2014-11-14 15:57:09 -0800 | [diff] [blame] | 673 | button->can_disable = !!of_get_property(pp, "linux,can-disable", NULL); |
| 674 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 675 | if (of_property_read_u32(pp, "debounce-interval", |
| 676 | &button->debounce_interval)) |
| 677 | button->debounce_interval = 5; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 678 | } |
| 679 | |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 680 | if (pdata->nbuttons == 0) |
| 681 | return ERR_PTR(-EINVAL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 682 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 683 | return pdata; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Jingoo Han | 22daae3 | 2014-05-07 12:58:06 -0700 | [diff] [blame] | 686 | static const struct of_device_id gpio_keys_of_match[] = { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 687 | { .compatible = "gpio-keys", }, |
| 688 | { }, |
| 689 | }; |
| 690 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); |
| 691 | |
| 692 | #else |
| 693 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 694 | static inline struct gpio_keys_platform_data * |
| 695 | gpio_keys_get_devtree_pdata(struct device *dev) |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 696 | { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 697 | return ERR_PTR(-ENODEV); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 698 | } |
| 699 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 700 | #endif |
| 701 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 702 | static int gpio_keys_probe(struct platform_device *pdev) |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 703 | { |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 704 | struct device *dev = &pdev->dev; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 705 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
| 706 | struct gpio_keys_drvdata *ddata; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 707 | struct input_dev *input; |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 708 | size_t size; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 709 | int i, error; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 710 | int wakeup = 0; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 711 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 712 | if (!pdata) { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 713 | pdata = gpio_keys_get_devtree_pdata(dev); |
| 714 | if (IS_ERR(pdata)) |
| 715 | return PTR_ERR(pdata); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 716 | } |
| 717 | |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 718 | size = sizeof(struct gpio_keys_drvdata) + |
| 719 | pdata->nbuttons * sizeof(struct gpio_button_data); |
| 720 | ddata = devm_kzalloc(dev, size, GFP_KERNEL); |
| 721 | if (!ddata) { |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 722 | dev_err(dev, "failed to allocate state\n"); |
Andy Shevchenko | 5d422f2 | 2014-04-25 14:21:59 -0700 | [diff] [blame] | 723 | return -ENOMEM; |
| 724 | } |
| 725 | |
| 726 | input = devm_input_allocate_device(dev); |
| 727 | if (!input) { |
| 728 | dev_err(dev, "failed to allocate input device\n"); |
| 729 | return -ENOMEM; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 730 | } |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 731 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 732 | ddata->pdata = pdata; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 733 | ddata->input = input; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 734 | mutex_init(&ddata->disable_lock); |
| 735 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 736 | platform_set_drvdata(pdev, ddata); |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 737 | input_set_drvdata(input, ddata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 738 | |
Alexander Stein | 4671127 | 2011-04-11 23:34:48 -0700 | [diff] [blame] | 739 | input->name = pdata->name ? : pdev->name; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 740 | input->phys = "gpio-keys/input0"; |
Dmitry Torokhov | 469ba4d | 2007-04-12 01:34:58 -0400 | [diff] [blame] | 741 | input->dev.parent = &pdev->dev; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 742 | input->open = gpio_keys_open; |
| 743 | input->close = gpio_keys_close; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 744 | |
| 745 | input->id.bustype = BUS_HOST; |
| 746 | input->id.vendor = 0x0001; |
| 747 | input->id.product = 0x0001; |
| 748 | input->id.version = 0x0100; |
| 749 | |
Dominic Curran | b67b4b1 | 2008-10-27 22:30:53 -0400 | [diff] [blame] | 750 | /* Enable auto repeat feature of Linux input subsystem */ |
| 751 | if (pdata->rep) |
| 752 | __set_bit(EV_REP, input->evbit); |
| 753 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 754 | for (i = 0; i < pdata->nbuttons; i++) { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 755 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 756 | struct gpio_button_data *bdata = &ddata->data[i]; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 757 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 758 | error = gpio_keys_setup_key(pdev, input, bdata, button); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 759 | if (error) |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 760 | return error; |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 761 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 762 | if (button->wakeup) |
| 763 | wakeup = 1; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 764 | } |
| 765 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 766 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 767 | if (error) { |
| 768 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
| 769 | error); |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 770 | return error; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 771 | } |
| 772 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 773 | error = input_register_device(input); |
| 774 | if (error) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 775 | dev_err(dev, "Unable to register input device, error: %d\n", |
| 776 | error); |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 777 | goto err_remove_group; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 778 | } |
| 779 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 780 | device_init_wakeup(&pdev->dev, wakeup); |
| 781 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 782 | return 0; |
| 783 | |
Alexander Shiyan | 2724551 | 2014-04-28 09:52:36 -0700 | [diff] [blame] | 784 | err_remove_group: |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 785 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 786 | return error; |
| 787 | } |
| 788 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 789 | static int gpio_keys_remove(struct platform_device *pdev) |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 790 | { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 791 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 792 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 793 | device_init_wakeup(&pdev->dev, 0); |
| 794 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 795 | return 0; |
| 796 | } |
| 797 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 798 | #ifdef CONFIG_PM_SLEEP |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 799 | static int gpio_keys_suspend(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 800 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 801 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 802 | struct input_dev *input = ddata->input; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 803 | int i; |
| 804 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 805 | if (device_may_wakeup(dev)) { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 806 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 807 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 808 | if (bdata->button->wakeup) |
| 809 | enable_irq_wake(bdata->irq); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 810 | } |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 811 | } else { |
| 812 | mutex_lock(&input->mutex); |
| 813 | if (input->users) |
| 814 | gpio_keys_close(input); |
| 815 | mutex_unlock(&input->mutex); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | return 0; |
| 819 | } |
| 820 | |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 821 | static int gpio_keys_resume(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 822 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 823 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 824 | struct input_dev *input = ddata->input; |
| 825 | int error = 0; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 826 | int i; |
| 827 | |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 828 | if (device_may_wakeup(dev)) { |
| 829 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
| 830 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 831 | if (bdata->button->wakeup) |
| 832 | disable_irq_wake(bdata->irq); |
| 833 | } |
| 834 | } else { |
| 835 | mutex_lock(&input->mutex); |
| 836 | if (input->users) |
| 837 | error = gpio_keys_open(input); |
| 838 | mutex_unlock(&input->mutex); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 839 | } |
Dmitry Torokhov | 5b76d7b | 2012-11-24 01:22:43 -0800 | [diff] [blame] | 840 | |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 841 | if (error) |
| 842 | return error; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 843 | |
Jonas Aaberg | dda19a9 | 2012-11-24 00:10:29 -0800 | [diff] [blame] | 844 | gpio_keys_report_state(ddata); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 845 | return 0; |
| 846 | } |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 847 | #endif |
| 848 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 849 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
| 850 | |
Uwe Kleine-König | 9b07044 | 2008-07-30 10:34:02 -0400 | [diff] [blame] | 851 | static struct platform_driver gpio_keys_device_driver = { |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 852 | .probe = gpio_keys_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 853 | .remove = gpio_keys_remove, |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 854 | .driver = { |
| 855 | .name = "gpio-keys", |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 856 | .pm = &gpio_keys_pm_ops, |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame] | 857 | .of_match_table = of_match_ptr(gpio_keys_of_match), |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 858 | } |
| 859 | }; |
| 860 | |
| 861 | static int __init gpio_keys_init(void) |
| 862 | { |
| 863 | return platform_driver_register(&gpio_keys_device_driver); |
| 864 | } |
| 865 | |
| 866 | static void __exit gpio_keys_exit(void) |
| 867 | { |
| 868 | platform_driver_unregister(&gpio_keys_device_driver); |
| 869 | } |
| 870 | |
David Jander | b233020 | 2011-06-23 01:30:09 -0700 | [diff] [blame] | 871 | late_initcall(gpio_keys_init); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 872 | module_exit(gpio_keys_exit); |
| 873 | |
| 874 | MODULE_LICENSE("GPL"); |
| 875 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); |
David Jander | 7e2ecdf | 2011-06-21 14:26:18 -0700 | [diff] [blame] | 876 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 877 | MODULE_ALIAS("platform:gpio-keys"); |