Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Driver for buttons on GPIO lines not capable of generating interrupts |
| 3 | * |
| 4 | * Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org> |
| 5 | * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com> |
| 6 | * |
| 7 | * This file was based on: /drivers/input/misc/cobalt_btns.c |
| 8 | * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> |
| 9 | * |
| 10 | * also was based on: /drivers/input/keyboard/gpio_keys.c |
| 11 | * Copyright 2005 Phil Blundell |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License version 2 as |
| 15 | * published by the Free Software Foundation. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 20 | #include <linux/slab.h> |
| 21 | #include <linux/input.h> |
| 22 | #include <linux/input-polldev.h> |
| 23 | #include <linux/ioport.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/gpio.h> |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 26 | #include <linux/gpio/consumer.h> |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 27 | #include <linux/gpio_keys.h> |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 28 | #include <linux/property.h> |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 29 | |
| 30 | #define DRV_NAME "gpio-keys-polled" |
| 31 | |
| 32 | struct gpio_keys_button_data { |
| 33 | int last_state; |
| 34 | int count; |
| 35 | int threshold; |
| 36 | int can_sleep; |
| 37 | }; |
| 38 | |
| 39 | struct gpio_keys_polled_dev { |
| 40 | struct input_polled_dev *poll_dev; |
| 41 | struct device *dev; |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 42 | const struct gpio_keys_platform_data *pdata; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 43 | struct gpio_keys_button_data data[0]; |
| 44 | }; |
| 45 | |
| 46 | static void gpio_keys_polled_check_state(struct input_dev *input, |
| 47 | struct gpio_keys_button *button, |
| 48 | struct gpio_keys_button_data *bdata) |
| 49 | { |
| 50 | int state; |
| 51 | |
| 52 | if (bdata->can_sleep) |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 53 | state = !!gpiod_get_value_cansleep(button->gpiod); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 54 | else |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 55 | state = !!gpiod_get_value(button->gpiod); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 56 | |
| 57 | if (state != bdata->last_state) { |
| 58 | unsigned int type = button->type ?: EV_KEY; |
| 59 | |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 60 | input_event(input, type, button->code, state); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 61 | input_sync(input); |
| 62 | bdata->count = 0; |
| 63 | bdata->last_state = state; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static void gpio_keys_polled_poll(struct input_polled_dev *dev) |
| 68 | { |
| 69 | struct gpio_keys_polled_dev *bdev = dev->private; |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 70 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 71 | struct input_dev *input = dev->input; |
| 72 | int i; |
| 73 | |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 74 | for (i = 0; i < pdata->nbuttons; i++) { |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 75 | struct gpio_keys_button_data *bdata = &bdev->data[i]; |
| 76 | |
| 77 | if (bdata->count < bdata->threshold) |
| 78 | bdata->count++; |
| 79 | else |
| 80 | gpio_keys_polled_check_state(input, &pdata->buttons[i], |
| 81 | bdata); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static void gpio_keys_polled_open(struct input_polled_dev *dev) |
| 86 | { |
| 87 | struct gpio_keys_polled_dev *bdev = dev->private; |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 88 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 89 | |
| 90 | if (pdata->enable) |
| 91 | pdata->enable(bdev->dev); |
| 92 | } |
| 93 | |
| 94 | static void gpio_keys_polled_close(struct input_polled_dev *dev) |
| 95 | { |
| 96 | struct gpio_keys_polled_dev *bdev = dev->private; |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 97 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 98 | |
| 99 | if (pdata->disable) |
| 100 | pdata->disable(bdev->dev); |
| 101 | } |
| 102 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 103 | static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct device *dev) |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 104 | { |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 105 | struct gpio_keys_platform_data *pdata; |
| 106 | struct gpio_keys_button *button; |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 107 | struct fwnode_handle *child; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 108 | int error; |
| 109 | int nbuttons; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 110 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 111 | nbuttons = device_get_child_node_count(dev); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 112 | if (nbuttons == 0) |
| 113 | return NULL; |
| 114 | |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 115 | pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button), |
| 116 | GFP_KERNEL); |
| 117 | if (!pdata) |
| 118 | return ERR_PTR(-ENOMEM); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 119 | |
| 120 | pdata->buttons = (struct gpio_keys_button *)(pdata + 1); |
| 121 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 122 | pdata->rep = device_property_present(dev, "autorepeat"); |
| 123 | device_property_read_u32(dev, "poll-interval", &pdata->poll_interval); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 124 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 125 | device_for_each_child_node(dev, child) { |
| 126 | struct gpio_desc *desc; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 127 | |
Olliver Schinagl | 1feb57a | 2015-01-21 22:33:46 +0100 | [diff] [blame] | 128 | desc = devm_get_gpiod_from_child(dev, NULL, child); |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 129 | if (IS_ERR(desc)) { |
| 130 | error = PTR_ERR(desc); |
Gabor Juhos | d46329a | 2012-12-23 01:54:58 -0800 | [diff] [blame] | 131 | if (error != -EPROBE_DEFER) |
| 132 | dev_err(dev, |
| 133 | "Failed to get gpio flags, error: %d\n", |
| 134 | error); |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 135 | fwnode_handle_put(child); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 136 | return ERR_PTR(error); |
Gabor Juhos | d46329a | 2012-12-23 01:54:58 -0800 | [diff] [blame] | 137 | } |
| 138 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 139 | button = &pdata->buttons[pdata->nbuttons++]; |
| 140 | button->gpiod = desc; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 141 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 142 | if (fwnode_property_read_u32(child, "linux,code", &button->code)) { |
| 143 | dev_err(dev, "Button without keycode: %d\n", |
| 144 | pdata->nbuttons - 1); |
| 145 | fwnode_handle_put(child); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 146 | return ERR_PTR(-EINVAL); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 149 | fwnode_property_read_string(child, "label", &button->desc); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 150 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 151 | if (fwnode_property_read_u32(child, "linux,input-type", |
| 152 | &button->type)) |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 153 | button->type = EV_KEY; |
| 154 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 155 | button->wakeup = fwnode_property_present(child, "gpio-key,wakeup"); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 156 | |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 157 | if (fwnode_property_read_u32(child, "debounce-interval", |
| 158 | &button->debounce_interval)) |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 159 | button->debounce_interval = 5; |
| 160 | } |
| 161 | |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 162 | if (pdata->nbuttons == 0) |
| 163 | return ERR_PTR(-EINVAL); |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 164 | |
| 165 | return pdata; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Jingoo Han | 90c98ef | 2014-05-07 12:58:36 -0700 | [diff] [blame] | 168 | static const struct of_device_id gpio_keys_polled_of_match[] = { |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 169 | { .compatible = "gpio-keys-polled", }, |
| 170 | { }, |
| 171 | }; |
| 172 | MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match); |
| 173 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 174 | static int gpio_keys_polled_probe(struct platform_device *pdev) |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 175 | { |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 176 | struct device *dev = &pdev->dev; |
Dmitry Torokhov | 2976f24 | 2012-07-29 22:48:33 -0700 | [diff] [blame] | 177 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 178 | struct gpio_keys_polled_dev *bdev; |
| 179 | struct input_polled_dev *poll_dev; |
| 180 | struct input_dev *input; |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 181 | size_t size; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 182 | int error; |
| 183 | int i; |
| 184 | |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 185 | if (!pdata) { |
| 186 | pdata = gpio_keys_polled_get_devtree_pdata(dev); |
| 187 | if (IS_ERR(pdata)) |
| 188 | return PTR_ERR(pdata); |
| 189 | if (!pdata) { |
| 190 | dev_err(dev, "missing platform data\n"); |
| 191 | return -EINVAL; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | if (!pdata->poll_interval) { |
| 196 | dev_err(dev, "missing poll_interval value\n"); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 197 | return -EINVAL; |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 198 | } |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 199 | |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 200 | size = sizeof(struct gpio_keys_polled_dev) + |
| 201 | pdata->nbuttons * sizeof(struct gpio_keys_button_data); |
| 202 | bdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 203 | if (!bdev) { |
| 204 | dev_err(dev, "no memory for private data\n"); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 205 | return -ENOMEM; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 206 | } |
| 207 | |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 208 | poll_dev = devm_input_allocate_polled_device(&pdev->dev); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 209 | if (!poll_dev) { |
| 210 | dev_err(dev, "no memory for polled device\n"); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 211 | return -ENOMEM; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | poll_dev->private = bdev; |
| 215 | poll_dev->poll = gpio_keys_polled_poll; |
| 216 | poll_dev->poll_interval = pdata->poll_interval; |
| 217 | poll_dev->open = gpio_keys_polled_open; |
| 218 | poll_dev->close = gpio_keys_polled_close; |
| 219 | |
| 220 | input = poll_dev->input; |
| 221 | |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 222 | input->name = pdev->name; |
| 223 | input->phys = DRV_NAME"/input0"; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 224 | |
| 225 | input->id.bustype = BUS_HOST; |
| 226 | input->id.vendor = 0x0001; |
| 227 | input->id.product = 0x0001; |
| 228 | input->id.version = 0x0100; |
| 229 | |
Alexander Shiyan | 1a22e16 | 2012-11-29 08:57:17 -0800 | [diff] [blame] | 230 | __set_bit(EV_KEY, input->evbit); |
| 231 | if (pdata->rep) |
| 232 | __set_bit(EV_REP, input->evbit); |
| 233 | |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 234 | for (i = 0; i < pdata->nbuttons; i++) { |
| 235 | struct gpio_keys_button *button = &pdata->buttons[i]; |
| 236 | struct gpio_keys_button_data *bdata = &bdev->data[i]; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 237 | unsigned int type = button->type ?: EV_KEY; |
| 238 | |
| 239 | if (button->wakeup) { |
| 240 | dev_err(dev, DRV_NAME " does not support wakeup\n"); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 241 | return -EINVAL; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 242 | } |
| 243 | |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 244 | /* |
| 245 | * Legacy GPIO number so request the GPIO here and |
| 246 | * convert it to descriptor. |
| 247 | */ |
| 248 | if (!button->gpiod && gpio_is_valid(button->gpio)) { |
| 249 | unsigned flags = 0; |
| 250 | |
| 251 | if (button->active_low) |
| 252 | flags |= GPIOF_ACTIVE_LOW; |
| 253 | |
| 254 | error = devm_gpio_request_one(&pdev->dev, button->gpio, |
| 255 | flags, button->desc ? : DRV_NAME); |
| 256 | if (error) { |
| 257 | dev_err(dev, "unable to claim gpio %u, err=%d\n", |
| 258 | button->gpio, error); |
| 259 | return error; |
| 260 | } |
| 261 | |
| 262 | button->gpiod = gpio_to_desc(button->gpio); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 263 | } |
| 264 | |
Aaron Lu | 633a21d | 2014-10-21 23:30:25 +0200 | [diff] [blame] | 265 | if (IS_ERR(button->gpiod)) |
| 266 | return PTR_ERR(button->gpiod); |
| 267 | |
| 268 | bdata->can_sleep = gpiod_cansleep(button->gpiod); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 269 | bdata->last_state = -1; |
| 270 | bdata->threshold = DIV_ROUND_UP(button->debounce_interval, |
| 271 | pdata->poll_interval); |
| 272 | |
| 273 | input_set_capability(input, type, button->code); |
| 274 | } |
| 275 | |
| 276 | bdev->poll_dev = poll_dev; |
| 277 | bdev->dev = dev; |
| 278 | bdev->pdata = pdata; |
| 279 | platform_set_drvdata(pdev, bdev); |
| 280 | |
| 281 | error = input_register_polled_device(poll_dev); |
| 282 | if (error) { |
| 283 | dev_err(dev, "unable to register polled device, err=%d\n", |
| 284 | error); |
Alexander Shiyan | 6825263 | 2014-04-28 10:48:49 -0700 | [diff] [blame] | 285 | return error; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | /* report initial state of the buttons */ |
| 289 | for (i = 0; i < pdata->nbuttons; i++) |
| 290 | gpio_keys_polled_check_state(input, &pdata->buttons[i], |
Alexandre Pereira da Silva | a2f2524 | 2012-07-31 22:08:45 -0700 | [diff] [blame] | 291 | &bdev->data[i]); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 292 | |
| 293 | return 0; |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | static struct platform_driver gpio_keys_polled_driver = { |
| 297 | .probe = gpio_keys_polled_probe, |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 298 | .driver = { |
| 299 | .name = DRV_NAME, |
Aaron Lu | b26d4e2 | 2014-10-21 13:34:00 +0200 | [diff] [blame] | 300 | .of_match_table = gpio_keys_polled_of_match, |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 301 | }, |
| 302 | }; |
JJ Ding | 5146c84 | 2011-11-29 11:08:39 -0800 | [diff] [blame] | 303 | module_platform_driver(gpio_keys_polled_driver); |
Gabor Juhos | 0e7d0c8 | 2010-12-06 17:14:47 -0800 | [diff] [blame] | 304 | |
| 305 | MODULE_LICENSE("GPL v2"); |
| 306 | MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); |
| 307 | MODULE_DESCRIPTION("Polled GPIO Buttons driver"); |
| 308 | MODULE_ALIAS("platform:" DRV_NAME); |