Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 1 | /* drivers/input/misc/gpio_event.c |
| 2 | * |
| 3 | * Copyright (C) 2007 Google, Inc. |
| 4 | * |
| 5 | * This software is licensed under the terms of the GNU General Public |
| 6 | * License version 2, as published by the Free Software Foundation, and |
| 7 | * may be copied, distributed, and modified under those terms. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | */ |
| 15 | |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/input.h> |
| 18 | #include <linux/gpio_event.h> |
| 19 | #include <linux/hrtimer.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/slab.h> |
| 22 | |
| 23 | struct gpio_event { |
| 24 | struct gpio_event_input_devs *input_devs; |
| 25 | const struct gpio_event_platform_data *info; |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 26 | void *state[0]; |
| 27 | }; |
| 28 | |
| 29 | static int gpio_input_event( |
| 30 | struct input_dev *dev, unsigned int type, unsigned int code, int value) |
| 31 | { |
| 32 | int i; |
| 33 | int devnr; |
| 34 | int ret = 0; |
| 35 | int tmp_ret; |
| 36 | struct gpio_event_info **ii; |
| 37 | struct gpio_event *ip = input_get_drvdata(dev); |
| 38 | |
| 39 | for (devnr = 0; devnr < ip->input_devs->count; devnr++) |
| 40 | if (ip->input_devs->dev[devnr] == dev) |
| 41 | break; |
| 42 | if (devnr == ip->input_devs->count) { |
| 43 | pr_err("gpio_input_event: unknown device %p\n", dev); |
| 44 | return -EIO; |
| 45 | } |
| 46 | |
| 47 | for (i = 0, ii = ip->info->info; i < ip->info->info_count; i++, ii++) { |
| 48 | if ((*ii)->event) { |
| 49 | tmp_ret = (*ii)->event(ip->input_devs, *ii, |
| 50 | &ip->state[i], |
| 51 | devnr, type, code, value); |
| 52 | if (tmp_ret) |
| 53 | ret = tmp_ret; |
| 54 | } |
| 55 | } |
| 56 | return ret; |
| 57 | } |
| 58 | |
| 59 | static int gpio_event_call_all_func(struct gpio_event *ip, int func) |
| 60 | { |
| 61 | int i; |
| 62 | int ret; |
| 63 | struct gpio_event_info **ii; |
| 64 | |
| 65 | if (func == GPIO_EVENT_FUNC_INIT || func == GPIO_EVENT_FUNC_RESUME) { |
| 66 | ii = ip->info->info; |
| 67 | for (i = 0; i < ip->info->info_count; i++, ii++) { |
| 68 | if ((*ii)->func == NULL) { |
| 69 | ret = -ENODEV; |
| 70 | pr_err("gpio_event_probe: Incomplete pdata, " |
| 71 | "no function\n"); |
| 72 | goto err_no_func; |
| 73 | } |
| 74 | if (func == GPIO_EVENT_FUNC_RESUME && (*ii)->no_suspend) |
| 75 | continue; |
| 76 | ret = (*ii)->func(ip->input_devs, *ii, &ip->state[i], |
| 77 | func); |
| 78 | if (ret) { |
| 79 | pr_err("gpio_event_probe: function failed\n"); |
| 80 | goto err_func_failed; |
| 81 | } |
| 82 | } |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | ret = 0; |
| 87 | i = ip->info->info_count; |
| 88 | ii = ip->info->info + i; |
| 89 | while (i > 0) { |
| 90 | i--; |
| 91 | ii--; |
| 92 | if ((func & ~1) == GPIO_EVENT_FUNC_SUSPEND && (*ii)->no_suspend) |
| 93 | continue; |
| 94 | (*ii)->func(ip->input_devs, *ii, &ip->state[i], func & ~1); |
| 95 | err_func_failed: |
| 96 | err_no_func: |
| 97 | ; |
| 98 | } |
| 99 | return ret; |
| 100 | } |
| 101 | |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 102 | static void __maybe_unused gpio_event_suspend(struct gpio_event *ip) |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 103 | { |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 104 | gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_SUSPEND); |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 105 | if (ip->info->power) |
| 106 | ip->info->power(ip->info, 0); |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 109 | static void __maybe_unused gpio_event_resume(struct gpio_event *ip) |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 110 | { |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 111 | if (ip->info->power) |
| 112 | ip->info->power(ip->info, 1); |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 113 | gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_RESUME); |
| 114 | } |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 115 | |
| 116 | static int gpio_event_probe(struct platform_device *pdev) |
| 117 | { |
| 118 | int err; |
| 119 | struct gpio_event *ip; |
| 120 | struct gpio_event_platform_data *event_info; |
| 121 | int dev_count = 1; |
| 122 | int i; |
| 123 | int registered = 0; |
| 124 | |
| 125 | event_info = pdev->dev.platform_data; |
| 126 | if (event_info == NULL) { |
| 127 | pr_err("gpio_event_probe: No pdata\n"); |
| 128 | return -ENODEV; |
| 129 | } |
| 130 | if ((!event_info->name && !event_info->names[0]) || |
| 131 | !event_info->info || !event_info->info_count) { |
| 132 | pr_err("gpio_event_probe: Incomplete pdata\n"); |
| 133 | return -ENODEV; |
| 134 | } |
| 135 | if (!event_info->name) |
| 136 | while (event_info->names[dev_count]) |
| 137 | dev_count++; |
| 138 | ip = kzalloc(sizeof(*ip) + |
| 139 | sizeof(ip->state[0]) * event_info->info_count + |
| 140 | sizeof(*ip->input_devs) + |
| 141 | sizeof(ip->input_devs->dev[0]) * dev_count, GFP_KERNEL); |
| 142 | if (ip == NULL) { |
| 143 | err = -ENOMEM; |
| 144 | pr_err("gpio_event_probe: Failed to allocate private data\n"); |
| 145 | goto err_kp_alloc_failed; |
| 146 | } |
| 147 | ip->input_devs = (void*)&ip->state[event_info->info_count]; |
| 148 | platform_set_drvdata(pdev, ip); |
| 149 | |
| 150 | for (i = 0; i < dev_count; i++) { |
| 151 | struct input_dev *input_dev = input_allocate_device(); |
| 152 | if (input_dev == NULL) { |
| 153 | err = -ENOMEM; |
| 154 | pr_err("gpio_event_probe: " |
| 155 | "Failed to allocate input device\n"); |
| 156 | goto err_input_dev_alloc_failed; |
| 157 | } |
| 158 | input_set_drvdata(input_dev, ip); |
| 159 | input_dev->name = event_info->name ? |
| 160 | event_info->name : event_info->names[i]; |
| 161 | input_dev->event = gpio_input_event; |
| 162 | ip->input_devs->dev[i] = input_dev; |
| 163 | } |
| 164 | ip->input_devs->count = dev_count; |
| 165 | ip->info = event_info; |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 166 | if (event_info->power) |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 167 | ip->info->power(ip->info, 1); |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 168 | |
| 169 | err = gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_INIT); |
| 170 | if (err) |
| 171 | goto err_call_all_func_failed; |
| 172 | |
| 173 | for (i = 0; i < dev_count; i++) { |
| 174 | err = input_register_device(ip->input_devs->dev[i]); |
| 175 | if (err) { |
| 176 | pr_err("gpio_event_probe: Unable to register %s " |
| 177 | "input device\n", ip->input_devs->dev[i]->name); |
| 178 | goto err_input_register_device_failed; |
| 179 | } |
| 180 | registered++; |
| 181 | } |
| 182 | |
| 183 | return 0; |
| 184 | |
| 185 | err_input_register_device_failed: |
| 186 | gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT); |
| 187 | err_call_all_func_failed: |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 188 | if (event_info->power) |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 189 | ip->info->power(ip->info, 0); |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 190 | for (i = 0; i < registered; i++) |
| 191 | input_unregister_device(ip->input_devs->dev[i]); |
| 192 | for (i = dev_count - 1; i >= registered; i--) { |
| 193 | input_free_device(ip->input_devs->dev[i]); |
| 194 | err_input_dev_alloc_failed: |
| 195 | ; |
| 196 | } |
| 197 | kfree(ip); |
| 198 | err_kp_alloc_failed: |
| 199 | return err; |
| 200 | } |
| 201 | |
| 202 | static int gpio_event_remove(struct platform_device *pdev) |
| 203 | { |
| 204 | struct gpio_event *ip = platform_get_drvdata(pdev); |
| 205 | int i; |
| 206 | |
| 207 | gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT); |
Colin Cross | 1c70598 | 2012-02-01 20:26:28 -0800 | [diff] [blame] | 208 | if (ip->info->power) |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 209 | ip->info->power(ip->info, 0); |
Arve Hjønnevåg | ca98413 | 2008-10-15 18:23:47 -0700 | [diff] [blame] | 210 | for (i = 0; i < ip->input_devs->count; i++) |
| 211 | input_unregister_device(ip->input_devs->dev[i]); |
| 212 | kfree(ip); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static struct platform_driver gpio_event_driver = { |
| 217 | .probe = gpio_event_probe, |
| 218 | .remove = gpio_event_remove, |
| 219 | .driver = { |
| 220 | .name = GPIO_EVENT_DEV_NAME, |
| 221 | }, |
| 222 | }; |
| 223 | |
| 224 | module_platform_driver(gpio_event_driver); |
| 225 | |
| 226 | MODULE_DESCRIPTION("GPIO Event Driver"); |
| 227 | MODULE_LICENSE("GPL"); |
| 228 | |