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> |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 29 | #include <linux/of_platform.h> |
| 30 | #include <linux/of_gpio.h> |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 31 | #include <linux/spinlock.h> |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 32 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 33 | struct gpio_button_data { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 34 | const struct gpio_keys_button *button; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 35 | struct input_dev *input; |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 36 | struct timer_list timer; |
Jani Nikula | da0d03f | 2009-06-28 22:38:56 -0700 | [diff] [blame] | 37 | struct work_struct work; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 38 | unsigned int timer_debounce; /* in msecs */ |
| 39 | unsigned int irq; |
| 40 | spinlock_t lock; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 41 | bool disabled; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 42 | bool key_pressed; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | struct gpio_keys_drvdata { |
| 46 | struct input_dev *input; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 47 | struct mutex disable_lock; |
| 48 | unsigned int n_buttons; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 49 | int (*enable)(struct device *dev); |
| 50 | void (*disable)(struct device *dev); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 51 | struct gpio_button_data data[0]; |
| 52 | }; |
| 53 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 54 | /* |
| 55 | * SYSFS interface for enabling/disabling keys and switches: |
| 56 | * |
| 57 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ |
| 58 | * keys [ro] - bitmap of keys (EV_KEY) which can be |
| 59 | * disabled |
| 60 | * switches [ro] - bitmap of switches (EV_SW) which can be |
| 61 | * disabled |
| 62 | * disabled_keys [rw] - bitmap of keys currently disabled |
| 63 | * disabled_switches [rw] - bitmap of switches currently disabled |
| 64 | * |
| 65 | * Userland can change these values and hence disable event generation |
| 66 | * for each key (or switch). Disabling a key means its interrupt line |
| 67 | * is disabled. |
| 68 | * |
| 69 | * For example, if we have following switches set up as gpio-keys: |
| 70 | * SW_DOCK = 5 |
| 71 | * SW_CAMERA_LENS_COVER = 9 |
| 72 | * SW_KEYPAD_SLIDE = 10 |
| 73 | * SW_FRONT_PROXIMITY = 11 |
| 74 | * This is read from switches: |
| 75 | * 11-9,5 |
| 76 | * Next we want to disable proximity (11) and dock (5), we write: |
| 77 | * 11,5 |
| 78 | * to file disabled_switches. Now proximity and dock IRQs are disabled. |
| 79 | * This can be verified by reading the file disabled_switches: |
| 80 | * 11,5 |
| 81 | * If we now want to enable proximity (11) switch we write: |
| 82 | * 5 |
| 83 | * to disabled_switches. |
| 84 | * |
| 85 | * We can disable only those keys which don't allow sharing the irq. |
| 86 | */ |
| 87 | |
| 88 | /** |
| 89 | * get_n_events_by_type() - returns maximum number of events per @type |
| 90 | * @type: type of button (%EV_KEY, %EV_SW) |
| 91 | * |
| 92 | * Return value of this function can be used to allocate bitmap |
| 93 | * large enough to hold all bits for given type. |
| 94 | */ |
| 95 | static inline int get_n_events_by_type(int type) |
| 96 | { |
| 97 | BUG_ON(type != EV_SW && type != EV_KEY); |
| 98 | |
| 99 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * gpio_keys_disable_button() - disables given GPIO button |
| 104 | * @bdata: button data for button to be disabled |
| 105 | * |
| 106 | * Disables button pointed by @bdata. This is done by masking |
| 107 | * IRQ line. After this function is called, button won't generate |
| 108 | * input events anymore. Note that one can only disable buttons |
| 109 | * that don't share IRQs. |
| 110 | * |
| 111 | * Make sure that @bdata->disable_lock is locked when entering |
| 112 | * this function to avoid races when concurrent threads are |
| 113 | * disabling buttons at the same time. |
| 114 | */ |
| 115 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) |
| 116 | { |
| 117 | if (!bdata->disabled) { |
| 118 | /* |
| 119 | * Disable IRQ and possible debouncing timer. |
| 120 | */ |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 121 | disable_irq(bdata->irq); |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 122 | if (bdata->timer_debounce) |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 123 | del_timer_sync(&bdata->timer); |
| 124 | |
| 125 | bdata->disabled = true; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * gpio_keys_enable_button() - enables given GPIO button |
| 131 | * @bdata: button data for button to be disabled |
| 132 | * |
| 133 | * Enables given button pointed by @bdata. |
| 134 | * |
| 135 | * Make sure that @bdata->disable_lock is locked when entering |
| 136 | * this function to avoid races with concurrent threads trying |
| 137 | * to enable the same button at the same time. |
| 138 | */ |
| 139 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) |
| 140 | { |
| 141 | if (bdata->disabled) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 142 | enable_irq(bdata->irq); |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 143 | bdata->disabled = false; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons |
| 149 | * @ddata: pointer to drvdata |
| 150 | * @buf: buffer where stringified bitmap is written |
| 151 | * @type: button type (%EV_KEY, %EV_SW) |
| 152 | * @only_disabled: does caller want only those buttons that are |
| 153 | * currently disabled or all buttons that can be |
| 154 | * disabled |
| 155 | * |
| 156 | * This function writes buttons that can be disabled to @buf. If |
| 157 | * @only_disabled is true, then @buf contains only those buttons |
| 158 | * that are currently disabled. Returns 0 on success or negative |
| 159 | * errno on failure. |
| 160 | */ |
| 161 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, |
| 162 | char *buf, unsigned int type, |
| 163 | bool only_disabled) |
| 164 | { |
| 165 | int n_events = get_n_events_by_type(type); |
| 166 | unsigned long *bits; |
| 167 | ssize_t ret; |
| 168 | int i; |
| 169 | |
| 170 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 171 | if (!bits) |
| 172 | return -ENOMEM; |
| 173 | |
| 174 | for (i = 0; i < ddata->n_buttons; i++) { |
| 175 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 176 | |
| 177 | if (bdata->button->type != type) |
| 178 | continue; |
| 179 | |
| 180 | if (only_disabled && !bdata->disabled) |
| 181 | continue; |
| 182 | |
| 183 | __set_bit(bdata->button->code, bits); |
| 184 | } |
| 185 | |
| 186 | ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); |
| 187 | buf[ret++] = '\n'; |
| 188 | buf[ret] = '\0'; |
| 189 | |
| 190 | kfree(bits); |
| 191 | |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap |
| 197 | * @ddata: pointer to drvdata |
| 198 | * @buf: buffer from userspace that contains stringified bitmap |
| 199 | * @type: button type (%EV_KEY, %EV_SW) |
| 200 | * |
| 201 | * This function parses stringified bitmap from @buf and disables/enables |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 202 | * GPIO buttons accordingly. Returns 0 on success and negative error |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 203 | * on failure. |
| 204 | */ |
| 205 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, |
| 206 | const char *buf, unsigned int type) |
| 207 | { |
| 208 | int n_events = get_n_events_by_type(type); |
| 209 | unsigned long *bits; |
| 210 | ssize_t error; |
| 211 | int i; |
| 212 | |
| 213 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 214 | if (!bits) |
| 215 | return -ENOMEM; |
| 216 | |
| 217 | error = bitmap_parselist(buf, bits, n_events); |
| 218 | if (error) |
| 219 | goto out; |
| 220 | |
| 221 | /* First validate */ |
| 222 | for (i = 0; i < ddata->n_buttons; i++) { |
| 223 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 224 | |
| 225 | if (bdata->button->type != type) |
| 226 | continue; |
| 227 | |
| 228 | if (test_bit(bdata->button->code, bits) && |
| 229 | !bdata->button->can_disable) { |
| 230 | error = -EINVAL; |
| 231 | goto out; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | mutex_lock(&ddata->disable_lock); |
| 236 | |
| 237 | for (i = 0; i < ddata->n_buttons; i++) { |
| 238 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 239 | |
| 240 | if (bdata->button->type != type) |
| 241 | continue; |
| 242 | |
| 243 | if (test_bit(bdata->button->code, bits)) |
| 244 | gpio_keys_disable_button(bdata); |
| 245 | else |
| 246 | gpio_keys_enable_button(bdata); |
| 247 | } |
| 248 | |
| 249 | mutex_unlock(&ddata->disable_lock); |
| 250 | |
| 251 | out: |
| 252 | kfree(bits); |
| 253 | return error; |
| 254 | } |
| 255 | |
| 256 | #define ATTR_SHOW_FN(name, type, only_disabled) \ |
| 257 | static ssize_t gpio_keys_show_##name(struct device *dev, \ |
| 258 | struct device_attribute *attr, \ |
| 259 | char *buf) \ |
| 260 | { \ |
| 261 | struct platform_device *pdev = to_platform_device(dev); \ |
| 262 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 263 | \ |
| 264 | return gpio_keys_attr_show_helper(ddata, buf, \ |
| 265 | type, only_disabled); \ |
| 266 | } |
| 267 | |
| 268 | ATTR_SHOW_FN(keys, EV_KEY, false); |
| 269 | ATTR_SHOW_FN(switches, EV_SW, false); |
| 270 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); |
| 271 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); |
| 272 | |
| 273 | /* |
| 274 | * ATTRIBUTES: |
| 275 | * |
| 276 | * /sys/devices/platform/gpio-keys/keys [ro] |
| 277 | * /sys/devices/platform/gpio-keys/switches [ro] |
| 278 | */ |
| 279 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); |
| 280 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); |
| 281 | |
| 282 | #define ATTR_STORE_FN(name, type) \ |
| 283 | static ssize_t gpio_keys_store_##name(struct device *dev, \ |
| 284 | struct device_attribute *attr, \ |
| 285 | const char *buf, \ |
| 286 | size_t count) \ |
| 287 | { \ |
| 288 | struct platform_device *pdev = to_platform_device(dev); \ |
| 289 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 290 | ssize_t error; \ |
| 291 | \ |
| 292 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ |
| 293 | if (error) \ |
| 294 | return error; \ |
| 295 | \ |
| 296 | return count; \ |
| 297 | } |
| 298 | |
| 299 | ATTR_STORE_FN(disabled_keys, EV_KEY); |
| 300 | ATTR_STORE_FN(disabled_switches, EV_SW); |
| 301 | |
| 302 | /* |
| 303 | * ATTRIBUTES: |
| 304 | * |
| 305 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] |
| 306 | * /sys/devices/platform/gpio-keys/disables_switches [rw] |
| 307 | */ |
| 308 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, |
| 309 | gpio_keys_show_disabled_keys, |
| 310 | gpio_keys_store_disabled_keys); |
| 311 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, |
| 312 | gpio_keys_show_disabled_switches, |
| 313 | gpio_keys_store_disabled_switches); |
| 314 | |
| 315 | static struct attribute *gpio_keys_attrs[] = { |
| 316 | &dev_attr_keys.attr, |
| 317 | &dev_attr_switches.attr, |
| 318 | &dev_attr_disabled_keys.attr, |
| 319 | &dev_attr_disabled_switches.attr, |
| 320 | NULL, |
| 321 | }; |
| 322 | |
| 323 | static struct attribute_group gpio_keys_attr_group = { |
| 324 | .attrs = gpio_keys_attrs, |
| 325 | }; |
| 326 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 327 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 328 | { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 329 | const struct gpio_keys_button *button = bdata->button; |
Uwe Kleine-König | ce25d7e | 2008-08-08 12:14:36 -0400 | [diff] [blame] | 330 | struct input_dev *input = bdata->input; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 331 | unsigned int type = button->type ?: EV_KEY; |
Philippe Langlais | 94a8cab | 2011-01-20 23:09:30 -0800 | [diff] [blame] | 332 | int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 333 | |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 334 | if (type == EV_ABS) { |
| 335 | if (state) |
| 336 | input_event(input, type, button->code, button->value); |
| 337 | } else { |
| 338 | input_event(input, type, button->code, !!state); |
| 339 | } |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 340 | input_sync(input); |
| 341 | } |
| 342 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 343 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 344 | { |
| 345 | struct gpio_button_data *bdata = |
| 346 | container_of(work, struct gpio_button_data, work); |
| 347 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 348 | gpio_keys_gpio_report_event(bdata); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 349 | } |
| 350 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 351 | static void gpio_keys_gpio_timer(unsigned long _data) |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 352 | { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 353 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 354 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 355 | schedule_work(&bdata->work); |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 358 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 359 | { |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 360 | struct gpio_button_data *bdata = dev_id; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 361 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 362 | BUG_ON(irq != bdata->irq); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 363 | |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 364 | if (bdata->timer_debounce) |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 365 | mod_timer(&bdata->timer, |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 366 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 367 | else |
Jani Nikula | da0d03f | 2009-06-28 22:38:56 -0700 | [diff] [blame] | 368 | schedule_work(&bdata->work); |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 369 | |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 370 | return IRQ_HANDLED; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 371 | } |
| 372 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 373 | static void gpio_keys_irq_timer(unsigned long _data) |
| 374 | { |
| 375 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
| 376 | struct input_dev *input = bdata->input; |
| 377 | unsigned long flags; |
| 378 | |
| 379 | spin_lock_irqsave(&bdata->lock, flags); |
| 380 | if (bdata->key_pressed) { |
| 381 | input_event(input, EV_KEY, bdata->button->code, 0); |
| 382 | input_sync(input); |
| 383 | bdata->key_pressed = false; |
| 384 | } |
| 385 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 386 | } |
| 387 | |
| 388 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) |
| 389 | { |
| 390 | struct gpio_button_data *bdata = dev_id; |
| 391 | const struct gpio_keys_button *button = bdata->button; |
| 392 | struct input_dev *input = bdata->input; |
| 393 | unsigned long flags; |
| 394 | |
| 395 | BUG_ON(irq != bdata->irq); |
| 396 | |
| 397 | spin_lock_irqsave(&bdata->lock, flags); |
| 398 | |
| 399 | if (!bdata->key_pressed) { |
| 400 | input_event(input, EV_KEY, button->code, 1); |
| 401 | input_sync(input); |
| 402 | |
| 403 | if (!bdata->timer_debounce) { |
| 404 | input_event(input, EV_KEY, button->code, 0); |
| 405 | input_sync(input); |
| 406 | goto out; |
| 407 | } |
| 408 | |
| 409 | bdata->key_pressed = true; |
| 410 | } |
| 411 | |
| 412 | if (bdata->timer_debounce) |
| 413 | mod_timer(&bdata->timer, |
| 414 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
| 415 | out: |
| 416 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 417 | return IRQ_HANDLED; |
| 418 | } |
| 419 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 420 | static int __devinit gpio_keys_setup_key(struct platform_device *pdev, |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 421 | struct input_dev *input, |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 422 | struct gpio_button_data *bdata, |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 423 | const struct gpio_keys_button *button) |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 424 | { |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 425 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 426 | struct device *dev = &pdev->dev; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 427 | irq_handler_t isr; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 428 | unsigned long irqflags; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 429 | int irq, error; |
| 430 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 431 | bdata->input = input; |
| 432 | bdata->button = button; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 433 | spin_lock_init(&bdata->lock); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 434 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 435 | if (gpio_is_valid(button->gpio)) { |
| 436 | |
| 437 | error = gpio_request(button->gpio, desc); |
| 438 | if (error < 0) { |
| 439 | dev_err(dev, "Failed to request GPIO %d, error %d\n", |
| 440 | button->gpio, error); |
| 441 | return error; |
| 442 | } |
| 443 | |
| 444 | error = gpio_direction_input(button->gpio); |
| 445 | if (error < 0) { |
| 446 | dev_err(dev, |
| 447 | "Failed to configure direction for GPIO %d, error %d\n", |
| 448 | button->gpio, error); |
| 449 | goto fail; |
| 450 | } |
| 451 | |
| 452 | if (button->debounce_interval) { |
| 453 | error = gpio_set_debounce(button->gpio, |
| 454 | button->debounce_interval * 1000); |
| 455 | /* use timer if gpiolib doesn't provide debounce */ |
| 456 | if (error < 0) |
| 457 | bdata->timer_debounce = |
| 458 | button->debounce_interval; |
| 459 | } |
| 460 | |
| 461 | irq = gpio_to_irq(button->gpio); |
| 462 | if (irq < 0) { |
| 463 | error = irq; |
| 464 | dev_err(dev, |
| 465 | "Unable to get irq number for GPIO %d, error %d\n", |
| 466 | button->gpio, error); |
| 467 | goto fail; |
| 468 | } |
| 469 | bdata->irq = irq; |
| 470 | |
| 471 | INIT_WORK(&bdata->work, gpio_keys_gpio_work_func); |
| 472 | setup_timer(&bdata->timer, |
| 473 | gpio_keys_gpio_timer, (unsigned long)bdata); |
| 474 | |
| 475 | isr = gpio_keys_gpio_isr; |
| 476 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; |
| 477 | |
| 478 | } else { |
| 479 | if (!button->irq) { |
| 480 | dev_err(dev, "No IRQ specified\n"); |
| 481 | return -EINVAL; |
| 482 | } |
| 483 | bdata->irq = button->irq; |
| 484 | |
| 485 | if (button->type && button->type != EV_KEY) { |
| 486 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); |
| 487 | return -EINVAL; |
| 488 | } |
| 489 | |
| 490 | bdata->timer_debounce = button->debounce_interval; |
| 491 | setup_timer(&bdata->timer, |
| 492 | gpio_keys_irq_timer, (unsigned long)bdata); |
| 493 | |
| 494 | isr = gpio_keys_irq_isr; |
| 495 | irqflags = 0; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 496 | } |
| 497 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 498 | input_set_capability(input, button->type ?: EV_KEY, button->code); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 499 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 500 | /* |
| 501 | * If platform has specified that the button can be disabled, |
| 502 | * we don't want it to share the interrupt line. |
| 503 | */ |
| 504 | if (!button->can_disable) |
| 505 | irqflags |= IRQF_SHARED; |
| 506 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 507 | error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata); |
Philippe Langlais | 94a8cab | 2011-01-20 23:09:30 -0800 | [diff] [blame] | 508 | if (error < 0) { |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 509 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 510 | bdata->irq, error); |
| 511 | goto fail; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | return 0; |
| 515 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 516 | fail: |
| 517 | if (gpio_is_valid(button->gpio)) |
| 518 | gpio_free(button->gpio); |
| 519 | |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 520 | return error; |
| 521 | } |
| 522 | |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 523 | static int gpio_keys_open(struct input_dev *input) |
| 524 | { |
| 525 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
| 526 | |
| 527 | return ddata->enable ? ddata->enable(input->dev.parent) : 0; |
| 528 | } |
| 529 | |
| 530 | static void gpio_keys_close(struct input_dev *input) |
| 531 | { |
| 532 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
| 533 | |
| 534 | if (ddata->disable) |
| 535 | ddata->disable(input->dev.parent); |
| 536 | } |
| 537 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 538 | /* |
| 539 | * Handlers for alternative sources of platform_data |
| 540 | */ |
| 541 | #ifdef CONFIG_OF |
| 542 | /* |
| 543 | * Translate OpenFirmware node properties into platform_data |
| 544 | */ |
| 545 | static int gpio_keys_get_devtree_pdata(struct device *dev, |
| 546 | struct gpio_keys_platform_data *pdata) |
| 547 | { |
| 548 | struct device_node *node, *pp; |
| 549 | int i; |
| 550 | struct gpio_keys_button *buttons; |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 551 | u32 reg; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 552 | |
| 553 | node = dev->of_node; |
| 554 | if (node == NULL) |
| 555 | return -ENODEV; |
| 556 | |
| 557 | memset(pdata, 0, sizeof *pdata); |
| 558 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 559 | pdata->rep = !!of_get_property(node, "autorepeat", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 560 | |
| 561 | /* First count the subnodes */ |
| 562 | pdata->nbuttons = 0; |
| 563 | pp = NULL; |
| 564 | while ((pp = of_get_next_child(node, pp))) |
| 565 | pdata->nbuttons++; |
| 566 | |
| 567 | if (pdata->nbuttons == 0) |
| 568 | return -ENODEV; |
| 569 | |
| 570 | buttons = kzalloc(pdata->nbuttons * (sizeof *buttons), GFP_KERNEL); |
| 571 | if (!buttons) |
Tobias Klauser | 1f4bb06 | 2011-07-30 12:08:10 -0700 | [diff] [blame] | 572 | return -ENOMEM; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 573 | |
| 574 | pp = NULL; |
| 575 | i = 0; |
| 576 | while ((pp = of_get_next_child(node, pp))) { |
| 577 | enum of_gpio_flags flags; |
| 578 | |
| 579 | if (!of_find_property(pp, "gpios", NULL)) { |
| 580 | pdata->nbuttons--; |
| 581 | dev_warn(dev, "Found button without gpios\n"); |
| 582 | continue; |
| 583 | } |
| 584 | buttons[i].gpio = of_get_gpio_flags(pp, 0, &flags); |
| 585 | buttons[i].active_low = flags & OF_GPIO_ACTIVE_LOW; |
| 586 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 587 | if (of_property_read_u32(pp, "linux,code", ®)) { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 588 | dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio); |
| 589 | goto out_fail; |
| 590 | } |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 591 | buttons[i].code = reg; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 592 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 593 | buttons[i].desc = of_get_property(pp, "label", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 594 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 595 | if (of_property_read_u32(pp, "linux,input-type", ®) == 0) |
| 596 | buttons[i].type = reg; |
| 597 | else |
| 598 | buttons[i].type = EV_KEY; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 599 | |
| 600 | buttons[i].wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); |
| 601 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 602 | if (of_property_read_u32(pp, "debounce-interval", ®) == 0) |
| 603 | buttons[i].debounce_interval = reg; |
| 604 | else |
| 605 | buttons[i].debounce_interval = 5; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 606 | |
| 607 | i++; |
| 608 | } |
| 609 | |
| 610 | pdata->buttons = buttons; |
| 611 | |
| 612 | return 0; |
| 613 | |
| 614 | out_fail: |
| 615 | kfree(buttons); |
| 616 | return -ENODEV; |
| 617 | } |
| 618 | |
| 619 | static struct of_device_id gpio_keys_of_match[] = { |
| 620 | { .compatible = "gpio-keys", }, |
| 621 | { }, |
| 622 | }; |
| 623 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); |
| 624 | |
| 625 | #else |
| 626 | |
| 627 | static int gpio_keys_get_devtree_pdata(struct device *dev, |
| 628 | struct gpio_keys_platform_data *altp) |
| 629 | { |
| 630 | return -ENODEV; |
| 631 | } |
| 632 | |
| 633 | #define gpio_keys_of_match NULL |
| 634 | |
| 635 | #endif |
| 636 | |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 637 | static void gpio_remove_key(struct gpio_button_data *bdata) |
| 638 | { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 639 | free_irq(bdata->irq, bdata); |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 640 | if (bdata->timer_debounce) |
| 641 | del_timer_sync(&bdata->timer); |
| 642 | cancel_work_sync(&bdata->work); |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 643 | if (gpio_is_valid(bdata->button->gpio)) |
| 644 | gpio_free(bdata->button->gpio); |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 647 | static int __devinit gpio_keys_probe(struct platform_device *pdev) |
| 648 | { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 649 | const struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 650 | struct gpio_keys_drvdata *ddata; |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 651 | struct device *dev = &pdev->dev; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 652 | struct gpio_keys_platform_data alt_pdata; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 653 | struct input_dev *input; |
| 654 | int i, error; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 655 | int wakeup = 0; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 656 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 657 | if (!pdata) { |
| 658 | error = gpio_keys_get_devtree_pdata(dev, &alt_pdata); |
| 659 | if (error) |
| 660 | return error; |
| 661 | pdata = &alt_pdata; |
| 662 | } |
| 663 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 664 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
| 665 | pdata->nbuttons * sizeof(struct gpio_button_data), |
| 666 | GFP_KERNEL); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 667 | input = input_allocate_device(); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 668 | if (!ddata || !input) { |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 669 | dev_err(dev, "failed to allocate state\n"); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 670 | error = -ENOMEM; |
| 671 | goto fail1; |
| 672 | } |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 673 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 674 | ddata->input = input; |
| 675 | ddata->n_buttons = pdata->nbuttons; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 676 | ddata->enable = pdata->enable; |
| 677 | ddata->disable = pdata->disable; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 678 | mutex_init(&ddata->disable_lock); |
| 679 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 680 | platform_set_drvdata(pdev, ddata); |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 681 | input_set_drvdata(input, ddata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 682 | |
Alexander Stein | 4671127 | 2011-04-11 23:34:48 -0700 | [diff] [blame] | 683 | input->name = pdata->name ? : pdev->name; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 684 | input->phys = "gpio-keys/input0"; |
Dmitry Torokhov | 469ba4d | 2007-04-12 01:34:58 -0400 | [diff] [blame] | 685 | input->dev.parent = &pdev->dev; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 686 | input->open = gpio_keys_open; |
| 687 | input->close = gpio_keys_close; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 688 | |
| 689 | input->id.bustype = BUS_HOST; |
| 690 | input->id.vendor = 0x0001; |
| 691 | input->id.product = 0x0001; |
| 692 | input->id.version = 0x0100; |
| 693 | |
Dominic Curran | b67b4b1 | 2008-10-27 22:30:53 -0400 | [diff] [blame] | 694 | /* Enable auto repeat feature of Linux input subsystem */ |
| 695 | if (pdata->rep) |
| 696 | __set_bit(EV_REP, input->evbit); |
| 697 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 698 | for (i = 0; i < pdata->nbuttons; i++) { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 699 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 700 | struct gpio_button_data *bdata = &ddata->data[i]; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 701 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 702 | error = gpio_keys_setup_key(pdev, input, bdata, button); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 703 | if (error) |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 704 | goto fail2; |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 705 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 706 | if (button->wakeup) |
| 707 | wakeup = 1; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 708 | } |
| 709 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 710 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 711 | if (error) { |
| 712 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
| 713 | error); |
| 714 | goto fail2; |
| 715 | } |
| 716 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 717 | error = input_register_device(input); |
| 718 | if (error) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 719 | dev_err(dev, "Unable to register input device, error: %d\n", |
| 720 | error); |
| 721 | goto fail3; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 722 | } |
| 723 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 724 | /* get current state of buttons that are connected to GPIOs */ |
| 725 | for (i = 0; i < pdata->nbuttons; i++) { |
| 726 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 727 | if (gpio_is_valid(bdata->button->gpio)) |
| 728 | gpio_keys_gpio_report_event(bdata); |
| 729 | } |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 730 | input_sync(input); |
| 731 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 732 | device_init_wakeup(&pdev->dev, wakeup); |
| 733 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 734 | return 0; |
| 735 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 736 | fail3: |
| 737 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 738 | fail2: |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 739 | while (--i >= 0) |
| 740 | gpio_remove_key(&ddata->data[i]); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 741 | |
Anti Sullin | 006df30 | 2007-09-26 00:01:03 -0400 | [diff] [blame] | 742 | platform_set_drvdata(pdev, NULL); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 743 | fail1: |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 744 | input_free_device(input); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 745 | kfree(ddata); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 746 | /* If we have no platform_data, we allocated buttons dynamically. */ |
| 747 | if (!pdev->dev.platform_data) |
| 748 | kfree(pdata->buttons); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 749 | |
| 750 | return error; |
| 751 | } |
| 752 | |
| 753 | static int __devexit gpio_keys_remove(struct platform_device *pdev) |
| 754 | { |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 755 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
| 756 | struct input_dev *input = ddata->input; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 757 | int i; |
| 758 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 759 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 760 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 761 | device_init_wakeup(&pdev->dev, 0); |
| 762 | |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 763 | for (i = 0; i < ddata->n_buttons; i++) |
| 764 | gpio_remove_key(&ddata->data[i]); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 765 | |
| 766 | input_unregister_device(input); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 767 | |
| 768 | /* |
| 769 | * If we had no platform_data, we allocated buttons dynamically, and |
| 770 | * must free them here. ddata->data[0].button is the pointer to the |
| 771 | * beginning of the allocated array. |
| 772 | */ |
| 773 | if (!pdev->dev.platform_data) |
| 774 | kfree(ddata->data[0].button); |
| 775 | |
Axel Lin | 1638207 | 2011-06-28 14:23:30 -0700 | [diff] [blame] | 776 | kfree(ddata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 777 | |
| 778 | return 0; |
| 779 | } |
| 780 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 781 | #ifdef CONFIG_PM_SLEEP |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 782 | static int gpio_keys_suspend(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 783 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 784 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 785 | int i; |
| 786 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 787 | if (device_may_wakeup(dev)) { |
| 788 | for (i = 0; i < ddata->n_buttons; i++) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 789 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 790 | if (bdata->button->wakeup) |
| 791 | enable_irq_wake(bdata->irq); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 792 | } |
| 793 | } |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 798 | static int gpio_keys_resume(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 799 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 800 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 801 | int i; |
| 802 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 803 | for (i = 0; i < ddata->n_buttons; i++) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 804 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 805 | if (bdata->button->wakeup && device_may_wakeup(dev)) |
| 806 | disable_irq_wake(bdata->irq); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 807 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 808 | if (gpio_is_valid(bdata->button->gpio)) |
| 809 | gpio_keys_gpio_report_event(bdata); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 810 | } |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 811 | input_sync(ddata->input); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 812 | |
| 813 | return 0; |
| 814 | } |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 815 | #endif |
| 816 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 817 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
| 818 | |
Uwe Kleine-König | 9b07044 | 2008-07-30 10:34:02 -0400 | [diff] [blame] | 819 | static struct platform_driver gpio_keys_device_driver = { |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 820 | .probe = gpio_keys_probe, |
| 821 | .remove = __devexit_p(gpio_keys_remove), |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 822 | .driver = { |
| 823 | .name = "gpio-keys", |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 824 | .owner = THIS_MODULE, |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 825 | .pm = &gpio_keys_pm_ops, |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 826 | .of_match_table = gpio_keys_of_match, |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 827 | } |
| 828 | }; |
| 829 | |
| 830 | static int __init gpio_keys_init(void) |
| 831 | { |
| 832 | return platform_driver_register(&gpio_keys_device_driver); |
| 833 | } |
| 834 | |
| 835 | static void __exit gpio_keys_exit(void) |
| 836 | { |
| 837 | platform_driver_unregister(&gpio_keys_device_driver); |
| 838 | } |
| 839 | |
David Jander | b233020 | 2011-06-23 01:30:09 -0700 | [diff] [blame] | 840 | late_initcall(gpio_keys_init); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 841 | module_exit(gpio_keys_exit); |
| 842 | |
| 843 | MODULE_LICENSE("GPL"); |
| 844 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); |
David Jander | 7e2ecdf | 2011-06-21 14:26:18 -0700 | [diff] [blame] | 845 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 846 | MODULE_ALIAS("platform:gpio-keys"); |