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 { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 46 | const struct gpio_keys_platform_data *pdata; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 47 | struct input_dev *input; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 48 | struct mutex disable_lock; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 49 | struct gpio_button_data data[0]; |
| 50 | }; |
| 51 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 52 | /* |
| 53 | * SYSFS interface for enabling/disabling keys and switches: |
| 54 | * |
| 55 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ |
| 56 | * keys [ro] - bitmap of keys (EV_KEY) which can be |
| 57 | * disabled |
| 58 | * switches [ro] - bitmap of switches (EV_SW) which can be |
| 59 | * disabled |
| 60 | * disabled_keys [rw] - bitmap of keys currently disabled |
| 61 | * disabled_switches [rw] - bitmap of switches currently disabled |
| 62 | * |
| 63 | * Userland can change these values and hence disable event generation |
| 64 | * for each key (or switch). Disabling a key means its interrupt line |
| 65 | * is disabled. |
| 66 | * |
| 67 | * For example, if we have following switches set up as gpio-keys: |
| 68 | * SW_DOCK = 5 |
| 69 | * SW_CAMERA_LENS_COVER = 9 |
| 70 | * SW_KEYPAD_SLIDE = 10 |
| 71 | * SW_FRONT_PROXIMITY = 11 |
| 72 | * This is read from switches: |
| 73 | * 11-9,5 |
| 74 | * Next we want to disable proximity (11) and dock (5), we write: |
| 75 | * 11,5 |
| 76 | * to file disabled_switches. Now proximity and dock IRQs are disabled. |
| 77 | * This can be verified by reading the file disabled_switches: |
| 78 | * 11,5 |
| 79 | * If we now want to enable proximity (11) switch we write: |
| 80 | * 5 |
| 81 | * to disabled_switches. |
| 82 | * |
| 83 | * We can disable only those keys which don't allow sharing the irq. |
| 84 | */ |
| 85 | |
| 86 | /** |
| 87 | * get_n_events_by_type() - returns maximum number of events per @type |
| 88 | * @type: type of button (%EV_KEY, %EV_SW) |
| 89 | * |
| 90 | * Return value of this function can be used to allocate bitmap |
| 91 | * large enough to hold all bits for given type. |
| 92 | */ |
| 93 | static inline int get_n_events_by_type(int type) |
| 94 | { |
| 95 | BUG_ON(type != EV_SW && type != EV_KEY); |
| 96 | |
| 97 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * gpio_keys_disable_button() - disables given GPIO button |
| 102 | * @bdata: button data for button to be disabled |
| 103 | * |
| 104 | * Disables button pointed by @bdata. This is done by masking |
| 105 | * IRQ line. After this function is called, button won't generate |
| 106 | * input events anymore. Note that one can only disable buttons |
| 107 | * that don't share IRQs. |
| 108 | * |
| 109 | * Make sure that @bdata->disable_lock is locked when entering |
| 110 | * this function to avoid races when concurrent threads are |
| 111 | * disabling buttons at the same time. |
| 112 | */ |
| 113 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) |
| 114 | { |
| 115 | if (!bdata->disabled) { |
| 116 | /* |
| 117 | * Disable IRQ and possible debouncing timer. |
| 118 | */ |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 119 | disable_irq(bdata->irq); |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 120 | if (bdata->timer_debounce) |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 121 | del_timer_sync(&bdata->timer); |
| 122 | |
| 123 | bdata->disabled = true; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * gpio_keys_enable_button() - enables given GPIO button |
| 129 | * @bdata: button data for button to be disabled |
| 130 | * |
| 131 | * Enables given button pointed by @bdata. |
| 132 | * |
| 133 | * Make sure that @bdata->disable_lock is locked when entering |
| 134 | * this function to avoid races with concurrent threads trying |
| 135 | * to enable the same button at the same time. |
| 136 | */ |
| 137 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) |
| 138 | { |
| 139 | if (bdata->disabled) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 140 | enable_irq(bdata->irq); |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 141 | bdata->disabled = false; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons |
| 147 | * @ddata: pointer to drvdata |
| 148 | * @buf: buffer where stringified bitmap is written |
| 149 | * @type: button type (%EV_KEY, %EV_SW) |
| 150 | * @only_disabled: does caller want only those buttons that are |
| 151 | * currently disabled or all buttons that can be |
| 152 | * disabled |
| 153 | * |
| 154 | * This function writes buttons that can be disabled to @buf. If |
| 155 | * @only_disabled is true, then @buf contains only those buttons |
| 156 | * that are currently disabled. Returns 0 on success or negative |
| 157 | * errno on failure. |
| 158 | */ |
| 159 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, |
| 160 | char *buf, unsigned int type, |
| 161 | bool only_disabled) |
| 162 | { |
| 163 | int n_events = get_n_events_by_type(type); |
| 164 | unsigned long *bits; |
| 165 | ssize_t ret; |
| 166 | int i; |
| 167 | |
| 168 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 169 | if (!bits) |
| 170 | return -ENOMEM; |
| 171 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 172 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 173 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 174 | |
| 175 | if (bdata->button->type != type) |
| 176 | continue; |
| 177 | |
| 178 | if (only_disabled && !bdata->disabled) |
| 179 | continue; |
| 180 | |
| 181 | __set_bit(bdata->button->code, bits); |
| 182 | } |
| 183 | |
| 184 | ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); |
| 185 | buf[ret++] = '\n'; |
| 186 | buf[ret] = '\0'; |
| 187 | |
| 188 | kfree(bits); |
| 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap |
| 195 | * @ddata: pointer to drvdata |
| 196 | * @buf: buffer from userspace that contains stringified bitmap |
| 197 | * @type: button type (%EV_KEY, %EV_SW) |
| 198 | * |
| 199 | * This function parses stringified bitmap from @buf and disables/enables |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 200 | * GPIO buttons accordingly. Returns 0 on success and negative error |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 201 | * on failure. |
| 202 | */ |
| 203 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, |
| 204 | const char *buf, unsigned int type) |
| 205 | { |
| 206 | int n_events = get_n_events_by_type(type); |
| 207 | unsigned long *bits; |
| 208 | ssize_t error; |
| 209 | int i; |
| 210 | |
| 211 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); |
| 212 | if (!bits) |
| 213 | return -ENOMEM; |
| 214 | |
| 215 | error = bitmap_parselist(buf, bits, n_events); |
| 216 | if (error) |
| 217 | goto out; |
| 218 | |
| 219 | /* First validate */ |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 220 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 221 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 222 | |
| 223 | if (bdata->button->type != type) |
| 224 | continue; |
| 225 | |
| 226 | if (test_bit(bdata->button->code, bits) && |
| 227 | !bdata->button->can_disable) { |
| 228 | error = -EINVAL; |
| 229 | goto out; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | mutex_lock(&ddata->disable_lock); |
| 234 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 235 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 236 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 237 | |
| 238 | if (bdata->button->type != type) |
| 239 | continue; |
| 240 | |
| 241 | if (test_bit(bdata->button->code, bits)) |
| 242 | gpio_keys_disable_button(bdata); |
| 243 | else |
| 244 | gpio_keys_enable_button(bdata); |
| 245 | } |
| 246 | |
| 247 | mutex_unlock(&ddata->disable_lock); |
| 248 | |
| 249 | out: |
| 250 | kfree(bits); |
| 251 | return error; |
| 252 | } |
| 253 | |
| 254 | #define ATTR_SHOW_FN(name, type, only_disabled) \ |
| 255 | static ssize_t gpio_keys_show_##name(struct device *dev, \ |
| 256 | struct device_attribute *attr, \ |
| 257 | char *buf) \ |
| 258 | { \ |
| 259 | struct platform_device *pdev = to_platform_device(dev); \ |
| 260 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 261 | \ |
| 262 | return gpio_keys_attr_show_helper(ddata, buf, \ |
| 263 | type, only_disabled); \ |
| 264 | } |
| 265 | |
| 266 | ATTR_SHOW_FN(keys, EV_KEY, false); |
| 267 | ATTR_SHOW_FN(switches, EV_SW, false); |
| 268 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); |
| 269 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); |
| 270 | |
| 271 | /* |
| 272 | * ATTRIBUTES: |
| 273 | * |
| 274 | * /sys/devices/platform/gpio-keys/keys [ro] |
| 275 | * /sys/devices/platform/gpio-keys/switches [ro] |
| 276 | */ |
| 277 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); |
| 278 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); |
| 279 | |
| 280 | #define ATTR_STORE_FN(name, type) \ |
| 281 | static ssize_t gpio_keys_store_##name(struct device *dev, \ |
| 282 | struct device_attribute *attr, \ |
| 283 | const char *buf, \ |
| 284 | size_t count) \ |
| 285 | { \ |
| 286 | struct platform_device *pdev = to_platform_device(dev); \ |
| 287 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ |
| 288 | ssize_t error; \ |
| 289 | \ |
| 290 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ |
| 291 | if (error) \ |
| 292 | return error; \ |
| 293 | \ |
| 294 | return count; \ |
| 295 | } |
| 296 | |
| 297 | ATTR_STORE_FN(disabled_keys, EV_KEY); |
| 298 | ATTR_STORE_FN(disabled_switches, EV_SW); |
| 299 | |
| 300 | /* |
| 301 | * ATTRIBUTES: |
| 302 | * |
| 303 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] |
| 304 | * /sys/devices/platform/gpio-keys/disables_switches [rw] |
| 305 | */ |
| 306 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, |
| 307 | gpio_keys_show_disabled_keys, |
| 308 | gpio_keys_store_disabled_keys); |
| 309 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, |
| 310 | gpio_keys_show_disabled_switches, |
| 311 | gpio_keys_store_disabled_switches); |
| 312 | |
| 313 | static struct attribute *gpio_keys_attrs[] = { |
| 314 | &dev_attr_keys.attr, |
| 315 | &dev_attr_switches.attr, |
| 316 | &dev_attr_disabled_keys.attr, |
| 317 | &dev_attr_disabled_switches.attr, |
| 318 | NULL, |
| 319 | }; |
| 320 | |
| 321 | static struct attribute_group gpio_keys_attr_group = { |
| 322 | .attrs = gpio_keys_attrs, |
| 323 | }; |
| 324 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 325 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 326 | { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 327 | const struct gpio_keys_button *button = bdata->button; |
Uwe Kleine-König | ce25d7e | 2008-08-08 12:14:36 -0400 | [diff] [blame] | 328 | struct input_dev *input = bdata->input; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 329 | unsigned int type = button->type ?: EV_KEY; |
Philippe Langlais | 94a8cab | 2011-01-20 23:09:30 -0800 | [diff] [blame] | 330 | 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] | 331 | |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 332 | if (type == EV_ABS) { |
| 333 | if (state) |
| 334 | input_event(input, type, button->code, button->value); |
| 335 | } else { |
| 336 | input_event(input, type, button->code, !!state); |
| 337 | } |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 338 | input_sync(input); |
| 339 | } |
| 340 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 341 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 342 | { |
| 343 | struct gpio_button_data *bdata = |
| 344 | container_of(work, struct gpio_button_data, work); |
| 345 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 346 | gpio_keys_gpio_report_event(bdata); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 347 | } |
| 348 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 349 | static void gpio_keys_gpio_timer(unsigned long _data) |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 350 | { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 351 | struct gpio_button_data *bdata = (struct gpio_button_data *)_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 | schedule_work(&bdata->work); |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 354 | } |
| 355 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 356 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 357 | { |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 358 | struct gpio_button_data *bdata = dev_id; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 359 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 360 | BUG_ON(irq != bdata->irq); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 361 | |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 362 | if (bdata->timer_debounce) |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 363 | mod_timer(&bdata->timer, |
Grazvydas Ignotas | 28ed684 | 2010-06-28 10:59:32 -0700 | [diff] [blame] | 364 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
Jani Nikula | ca865a7 | 2009-06-28 22:38:44 -0700 | [diff] [blame] | 365 | else |
Jani Nikula | da0d03f | 2009-06-28 22:38:56 -0700 | [diff] [blame] | 366 | schedule_work(&bdata->work); |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 367 | |
Uwe Kleine-König | 57ffe9d | 2008-08-08 12:14:34 -0400 | [diff] [blame] | 368 | return IRQ_HANDLED; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 369 | } |
| 370 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 371 | static void gpio_keys_irq_timer(unsigned long _data) |
| 372 | { |
| 373 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
| 374 | struct input_dev *input = bdata->input; |
| 375 | unsigned long flags; |
| 376 | |
| 377 | spin_lock_irqsave(&bdata->lock, flags); |
| 378 | if (bdata->key_pressed) { |
| 379 | input_event(input, EV_KEY, bdata->button->code, 0); |
| 380 | input_sync(input); |
| 381 | bdata->key_pressed = false; |
| 382 | } |
| 383 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 384 | } |
| 385 | |
| 386 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) |
| 387 | { |
| 388 | struct gpio_button_data *bdata = dev_id; |
| 389 | const struct gpio_keys_button *button = bdata->button; |
| 390 | struct input_dev *input = bdata->input; |
| 391 | unsigned long flags; |
| 392 | |
| 393 | BUG_ON(irq != bdata->irq); |
| 394 | |
| 395 | spin_lock_irqsave(&bdata->lock, flags); |
| 396 | |
| 397 | if (!bdata->key_pressed) { |
| 398 | input_event(input, EV_KEY, button->code, 1); |
| 399 | input_sync(input); |
| 400 | |
| 401 | if (!bdata->timer_debounce) { |
| 402 | input_event(input, EV_KEY, button->code, 0); |
| 403 | input_sync(input); |
| 404 | goto out; |
| 405 | } |
| 406 | |
| 407 | bdata->key_pressed = true; |
| 408 | } |
| 409 | |
| 410 | if (bdata->timer_debounce) |
| 411 | mod_timer(&bdata->timer, |
| 412 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
| 413 | out: |
| 414 | spin_unlock_irqrestore(&bdata->lock, flags); |
| 415 | return IRQ_HANDLED; |
| 416 | } |
| 417 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 418 | static int __devinit gpio_keys_setup_key(struct platform_device *pdev, |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 419 | struct input_dev *input, |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 420 | struct gpio_button_data *bdata, |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 421 | const struct gpio_keys_button *button) |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 422 | { |
Alexander Stein | 92a4767 | 2011-04-11 23:34:37 -0700 | [diff] [blame] | 423 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 424 | struct device *dev = &pdev->dev; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 425 | irq_handler_t isr; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 426 | unsigned long irqflags; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 427 | int irq, error; |
| 428 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 429 | bdata->input = input; |
| 430 | bdata->button = button; |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 431 | spin_lock_init(&bdata->lock); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 432 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 433 | if (gpio_is_valid(button->gpio)) { |
| 434 | |
| 435 | error = gpio_request(button->gpio, desc); |
| 436 | if (error < 0) { |
| 437 | dev_err(dev, "Failed to request GPIO %d, error %d\n", |
| 438 | button->gpio, error); |
| 439 | return error; |
| 440 | } |
| 441 | |
| 442 | error = gpio_direction_input(button->gpio); |
| 443 | if (error < 0) { |
| 444 | dev_err(dev, |
| 445 | "Failed to configure direction for GPIO %d, error %d\n", |
| 446 | button->gpio, error); |
| 447 | goto fail; |
| 448 | } |
| 449 | |
| 450 | if (button->debounce_interval) { |
| 451 | error = gpio_set_debounce(button->gpio, |
| 452 | button->debounce_interval * 1000); |
| 453 | /* use timer if gpiolib doesn't provide debounce */ |
| 454 | if (error < 0) |
| 455 | bdata->timer_debounce = |
| 456 | button->debounce_interval; |
| 457 | } |
| 458 | |
| 459 | irq = gpio_to_irq(button->gpio); |
| 460 | if (irq < 0) { |
| 461 | error = irq; |
| 462 | dev_err(dev, |
| 463 | "Unable to get irq number for GPIO %d, error %d\n", |
| 464 | button->gpio, error); |
| 465 | goto fail; |
| 466 | } |
| 467 | bdata->irq = irq; |
| 468 | |
| 469 | INIT_WORK(&bdata->work, gpio_keys_gpio_work_func); |
| 470 | setup_timer(&bdata->timer, |
| 471 | gpio_keys_gpio_timer, (unsigned long)bdata); |
| 472 | |
| 473 | isr = gpio_keys_gpio_isr; |
| 474 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; |
| 475 | |
| 476 | } else { |
| 477 | if (!button->irq) { |
| 478 | dev_err(dev, "No IRQ specified\n"); |
| 479 | return -EINVAL; |
| 480 | } |
| 481 | bdata->irq = button->irq; |
| 482 | |
| 483 | if (button->type && button->type != EV_KEY) { |
| 484 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); |
| 485 | return -EINVAL; |
| 486 | } |
| 487 | |
| 488 | bdata->timer_debounce = button->debounce_interval; |
| 489 | setup_timer(&bdata->timer, |
| 490 | gpio_keys_irq_timer, (unsigned long)bdata); |
| 491 | |
| 492 | isr = gpio_keys_irq_isr; |
| 493 | irqflags = 0; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 494 | } |
| 495 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 496 | input_set_capability(input, button->type ?: EV_KEY, button->code); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 497 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 498 | /* |
| 499 | * If platform has specified that the button can be disabled, |
| 500 | * we don't want it to share the interrupt line. |
| 501 | */ |
| 502 | if (!button->can_disable) |
| 503 | irqflags |= IRQF_SHARED; |
| 504 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 505 | error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata); |
Philippe Langlais | 94a8cab | 2011-01-20 23:09:30 -0800 | [diff] [blame] | 506 | if (error < 0) { |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 507 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 508 | bdata->irq, error); |
| 509 | goto fail; |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | return 0; |
| 513 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 514 | fail: |
| 515 | if (gpio_is_valid(button->gpio)) |
| 516 | gpio_free(button->gpio); |
| 517 | |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 518 | return error; |
| 519 | } |
| 520 | |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 521 | static int gpio_keys_open(struct input_dev *input) |
| 522 | { |
| 523 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 524 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 525 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 526 | return pdata->enable ? pdata->enable(input->dev.parent) : 0; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | static void gpio_keys_close(struct input_dev *input) |
| 530 | { |
| 531 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 532 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 533 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 534 | if (pdata->disable) |
| 535 | pdata->disable(input->dev.parent); |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 536 | } |
| 537 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 538 | /* |
| 539 | * Handlers for alternative sources of platform_data |
| 540 | */ |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 541 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 542 | #ifdef CONFIG_OF |
| 543 | /* |
| 544 | * Translate OpenFirmware node properties into platform_data |
| 545 | */ |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 546 | static struct gpio_keys_platform_data * __devinit |
| 547 | gpio_keys_get_devtree_pdata(struct device *dev) |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 548 | { |
| 549 | struct device_node *node, *pp; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 550 | struct gpio_keys_platform_data *pdata; |
| 551 | struct gpio_keys_button *button; |
| 552 | int error; |
| 553 | int nbuttons; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 554 | int i; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 555 | |
| 556 | node = dev->of_node; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 557 | if (!node) { |
| 558 | error = -ENODEV; |
| 559 | goto err_out; |
| 560 | } |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 561 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 562 | nbuttons = of_get_child_count(node); |
| 563 | if (nbuttons == 0) { |
| 564 | error = -ENODEV; |
| 565 | goto err_out; |
| 566 | } |
| 567 | |
| 568 | pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button), |
| 569 | GFP_KERNEL); |
| 570 | if (!pdata) { |
| 571 | error = -ENOMEM; |
| 572 | goto err_out; |
| 573 | } |
| 574 | |
| 575 | pdata->buttons = (struct gpio_keys_button *)(pdata + 1); |
| 576 | pdata->nbuttons = nbuttons; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 577 | |
Tobias Klauser | cca8469 | 2011-09-09 11:09:50 -0700 | [diff] [blame] | 578 | pdata->rep = !!of_get_property(node, "autorepeat", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 579 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 580 | i = 0; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 581 | for_each_child_of_node(node, pp) { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 582 | enum of_gpio_flags flags; |
| 583 | |
| 584 | if (!of_find_property(pp, "gpios", NULL)) { |
| 585 | pdata->nbuttons--; |
| 586 | dev_warn(dev, "Found button without gpios\n"); |
| 587 | continue; |
| 588 | } |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 589 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 590 | button = &pdata->buttons[i++]; |
| 591 | |
| 592 | button->gpio = of_get_gpio_flags(pp, 0, &flags); |
| 593 | button->active_low = flags & OF_GPIO_ACTIVE_LOW; |
| 594 | |
| 595 | if (of_property_read_u32(pp, "linux,code", &button->code)) { |
| 596 | dev_err(dev, "Button without keycode: 0x%x\n", |
| 597 | button->gpio); |
| 598 | error = -EINVAL; |
| 599 | goto err_free_pdata; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 600 | } |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 601 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 602 | button->desc = of_get_property(pp, "label", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 603 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 604 | if (of_property_read_u32(pp, "linux,input-type", &button->type)) |
| 605 | button->type = EV_KEY; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 606 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 607 | button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 608 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 609 | if (of_property_read_u32(pp, "debounce-interval", |
| 610 | &button->debounce_interval)) |
| 611 | button->debounce_interval = 5; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 612 | } |
| 613 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 614 | if (pdata->nbuttons == 0) { |
| 615 | error = -EINVAL; |
| 616 | goto err_free_pdata; |
| 617 | } |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 618 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 619 | return pdata; |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 620 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 621 | err_free_pdata: |
| 622 | kfree(pdata); |
| 623 | err_out: |
| 624 | return ERR_PTR(error); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | static struct of_device_id gpio_keys_of_match[] = { |
| 628 | { .compatible = "gpio-keys", }, |
| 629 | { }, |
| 630 | }; |
| 631 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); |
| 632 | |
| 633 | #else |
| 634 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 635 | static inline struct gpio_keys_platform_data * |
| 636 | gpio_keys_get_devtree_pdata(struct device *dev) |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 637 | { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 638 | return ERR_PTR(-ENODEV); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 639 | } |
| 640 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 641 | #endif |
| 642 | |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 643 | static void gpio_remove_key(struct gpio_button_data *bdata) |
| 644 | { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 645 | free_irq(bdata->irq, bdata); |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 646 | if (bdata->timer_debounce) |
| 647 | del_timer_sync(&bdata->timer); |
| 648 | cancel_work_sync(&bdata->work); |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 649 | if (gpio_is_valid(bdata->button->gpio)) |
| 650 | gpio_free(bdata->button->gpio); |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 651 | } |
| 652 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 653 | static int __devinit gpio_keys_probe(struct platform_device *pdev) |
| 654 | { |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 655 | struct device *dev = &pdev->dev; |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 656 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
| 657 | struct gpio_keys_drvdata *ddata; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 658 | struct input_dev *input; |
| 659 | int i, error; |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 660 | int wakeup = 0; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 661 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 662 | if (!pdata) { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 663 | pdata = gpio_keys_get_devtree_pdata(dev); |
| 664 | if (IS_ERR(pdata)) |
| 665 | return PTR_ERR(pdata); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 668 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
| 669 | pdata->nbuttons * sizeof(struct gpio_button_data), |
| 670 | GFP_KERNEL); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 671 | input = input_allocate_device(); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 672 | if (!ddata || !input) { |
Ben Dooks | db19fd8 | 2009-11-10 21:00:35 -0800 | [diff] [blame] | 673 | dev_err(dev, "failed to allocate state\n"); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 674 | error = -ENOMEM; |
| 675 | goto fail1; |
| 676 | } |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 677 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 678 | ddata->pdata = pdata; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 679 | ddata->input = input; |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 680 | mutex_init(&ddata->disable_lock); |
| 681 | |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 682 | platform_set_drvdata(pdev, ddata); |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 683 | input_set_drvdata(input, ddata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 684 | |
Alexander Stein | 4671127 | 2011-04-11 23:34:48 -0700 | [diff] [blame] | 685 | input->name = pdata->name ? : pdev->name; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 686 | input->phys = "gpio-keys/input0"; |
Dmitry Torokhov | 469ba4d | 2007-04-12 01:34:58 -0400 | [diff] [blame] | 687 | input->dev.parent = &pdev->dev; |
Shubhrajyoti D | 173bdd7 | 2010-08-03 19:44:40 -0700 | [diff] [blame] | 688 | input->open = gpio_keys_open; |
| 689 | input->close = gpio_keys_close; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 690 | |
| 691 | input->id.bustype = BUS_HOST; |
| 692 | input->id.vendor = 0x0001; |
| 693 | input->id.product = 0x0001; |
| 694 | input->id.version = 0x0100; |
| 695 | |
Dominic Curran | b67b4b1 | 2008-10-27 22:30:53 -0400 | [diff] [blame] | 696 | /* Enable auto repeat feature of Linux input subsystem */ |
| 697 | if (pdata->rep) |
| 698 | __set_bit(EV_REP, input->evbit); |
| 699 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 700 | for (i = 0; i < pdata->nbuttons; i++) { |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 701 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 702 | struct gpio_button_data *bdata = &ddata->data[i]; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 703 | |
Dmitry Torokhov | d908092 | 2012-03-18 23:36:29 -0700 | [diff] [blame] | 704 | error = gpio_keys_setup_key(pdev, input, bdata, button); |
Ben Dooks | bc8f1ea | 2009-11-10 21:01:31 -0800 | [diff] [blame] | 705 | if (error) |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 706 | goto fail2; |
Roman Moravcik | 84767d0 | 2007-05-01 00:39:13 -0400 | [diff] [blame] | 707 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 708 | if (button->wakeup) |
| 709 | wakeup = 1; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 710 | } |
| 711 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 712 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 713 | if (error) { |
| 714 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
| 715 | error); |
| 716 | goto fail2; |
| 717 | } |
| 718 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 719 | error = input_register_device(input); |
| 720 | if (error) { |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 721 | dev_err(dev, "Unable to register input device, error: %d\n", |
| 722 | error); |
| 723 | goto fail3; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 724 | } |
| 725 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 726 | /* get current state of buttons that are connected to GPIOs */ |
| 727 | for (i = 0; i < pdata->nbuttons; i++) { |
| 728 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 729 | if (gpio_is_valid(bdata->button->gpio)) |
| 730 | gpio_keys_gpio_report_event(bdata); |
| 731 | } |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 732 | input_sync(input); |
| 733 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 734 | device_init_wakeup(&pdev->dev, wakeup); |
| 735 | |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 736 | return 0; |
| 737 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 738 | fail3: |
| 739 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 740 | fail2: |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 741 | while (--i >= 0) |
| 742 | gpio_remove_key(&ddata->data[i]); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 743 | |
Anti Sullin | 006df30 | 2007-09-26 00:01:03 -0400 | [diff] [blame] | 744 | platform_set_drvdata(pdev, NULL); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 745 | fail1: |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 746 | input_free_device(input); |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 747 | kfree(ddata); |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 748 | /* If we have no platform data, we allocated pdata dynamically. */ |
| 749 | if (!dev_get_platdata(&pdev->dev)) |
| 750 | kfree(pdata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 751 | |
| 752 | return error; |
| 753 | } |
| 754 | |
| 755 | static int __devexit gpio_keys_remove(struct platform_device *pdev) |
| 756 | { |
Dmitry Baryshkov | a33466e | 2008-05-07 16:30:15 -0400 | [diff] [blame] | 757 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
| 758 | struct input_dev *input = ddata->input; |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 759 | int i; |
| 760 | |
Mika Westerberg | 9e3af04 | 2010-02-04 00:48:00 -0800 | [diff] [blame] | 761 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
| 762 | |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 763 | device_init_wakeup(&pdev->dev, 0); |
| 764 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 765 | for (i = 0; i < ddata->pdata->nbuttons; i++) |
Dmitry Torokhov | a16ca23 | 2012-03-18 23:36:30 -0700 | [diff] [blame] | 766 | gpio_remove_key(&ddata->data[i]); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 767 | |
| 768 | input_unregister_device(input); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 769 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 770 | /* If we have no platform data, we allocated pdata dynamically. */ |
| 771 | if (!dev_get_platdata(&pdev->dev)) |
| 772 | kfree(ddata->pdata); |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 773 | |
Axel Lin | 1638207 | 2011-06-28 14:23:30 -0700 | [diff] [blame] | 774 | kfree(ddata); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 775 | |
| 776 | return 0; |
| 777 | } |
| 778 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 779 | #ifdef CONFIG_PM_SLEEP |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 780 | static int gpio_keys_suspend(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 781 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 782 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 783 | int i; |
| 784 | |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 785 | if (device_may_wakeup(dev)) { |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 786 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 787 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 788 | if (bdata->button->wakeup) |
| 789 | enable_irq_wake(bdata->irq); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 790 | } |
| 791 | } |
| 792 | |
| 793 | return 0; |
| 794 | } |
| 795 | |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 796 | static int gpio_keys_resume(struct device *dev) |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 797 | { |
David Jander | fd05d08 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 798 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 799 | int i; |
| 800 | |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 801 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 802 | struct gpio_button_data *bdata = &ddata->data[i]; |
| 803 | if (bdata->button->wakeup && device_may_wakeup(dev)) |
| 804 | disable_irq_wake(bdata->irq); |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 805 | |
Laxman Dewangan | d8ee4a1 | 2012-03-19 17:54:31 -0700 | [diff] [blame] | 806 | if (gpio_is_valid(bdata->button->gpio)) |
| 807 | gpio_keys_gpio_report_event(bdata); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 808 | } |
Daniel Mack | 6ee88d7 | 2009-11-30 00:04:02 -0800 | [diff] [blame] | 809 | input_sync(ddata->input); |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 810 | |
| 811 | return 0; |
| 812 | } |
Anti Sullin | e15b021 | 2007-09-26 00:01:17 -0400 | [diff] [blame] | 813 | #endif |
| 814 | |
Dmitry Torokhov | bdda821 | 2011-07-09 12:41:46 -0700 | [diff] [blame] | 815 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
| 816 | |
Uwe Kleine-König | 9b07044 | 2008-07-30 10:34:02 -0400 | [diff] [blame] | 817 | static struct platform_driver gpio_keys_device_driver = { |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 818 | .probe = gpio_keys_probe, |
| 819 | .remove = __devexit_p(gpio_keys_remove), |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 820 | .driver = { |
| 821 | .name = "gpio-keys", |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 822 | .owner = THIS_MODULE, |
Mike Rapoport | ae78e0e | 2009-07-22 23:02:54 -0700 | [diff] [blame] | 823 | .pm = &gpio_keys_pm_ops, |
Alexandre Pereira da Silva | 219edc7 | 2012-07-29 22:18:47 -0700 | [diff] [blame^] | 824 | .of_match_table = of_match_ptr(gpio_keys_of_match), |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 825 | } |
| 826 | }; |
| 827 | |
| 828 | static int __init gpio_keys_init(void) |
| 829 | { |
| 830 | return platform_driver_register(&gpio_keys_device_driver); |
| 831 | } |
| 832 | |
| 833 | static void __exit gpio_keys_exit(void) |
| 834 | { |
| 835 | platform_driver_unregister(&gpio_keys_device_driver); |
| 836 | } |
| 837 | |
David Jander | b233020 | 2011-06-23 01:30:09 -0700 | [diff] [blame] | 838 | late_initcall(gpio_keys_init); |
Phil Blundell | 78a56aa | 2007-01-18 00:44:09 -0500 | [diff] [blame] | 839 | module_exit(gpio_keys_exit); |
| 840 | |
| 841 | MODULE_LICENSE("GPL"); |
| 842 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); |
David Jander | 7e2ecdf | 2011-06-21 14:26:18 -0700 | [diff] [blame] | 843 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 844 | MODULE_ALIAS("platform:gpio-keys"); |