mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-08-21 13:23:39 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16459 3c298f89-4303-0410-b956-a3cf2f4a3e73
1461 lines
43 KiB
Diff
1461 lines
43 KiB
Diff
From 6730377482c05a1742abb92f1463701f5d084a27 Mon Sep 17 00:00:00 2001
|
|
From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
|
|
Date: Wed, 15 Oct 2008 18:23:47 -0700
|
|
Subject: [PATCH 086/134] Input: Generic GPIO Input device.
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=utf-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
Supports keyboard matrixces, direct inputs, direct outputs and axes connected to gpios.
|
|
|
|
Signed-off-by: Arve Hjønnevåg <arve@android.com>
|
|
Signed-off-by: Nick Pelly <npelly@google.com>
|
|
---
|
|
drivers/input/misc/Kconfig | 5 +
|
|
drivers/input/misc/Makefile | 1 +
|
|
drivers/input/misc/gpio_axis.c | 180 +++++++++++++++++
|
|
drivers/input/misc/gpio_event.c | 224 +++++++++++++++++++++
|
|
drivers/input/misc/gpio_input.c | 343 ++++++++++++++++++++++++++++++++
|
|
drivers/input/misc/gpio_matrix.c | 406 ++++++++++++++++++++++++++++++++++++++
|
|
drivers/input/misc/gpio_output.c | 84 ++++++++
|
|
include/linux/gpio_event.h | 154 ++++++++++++++
|
|
8 files changed, 1397 insertions(+), 0 deletions(-)
|
|
create mode 100644 drivers/input/misc/gpio_axis.c
|
|
create mode 100644 drivers/input/misc/gpio_event.c
|
|
create mode 100644 drivers/input/misc/gpio_input.c
|
|
create mode 100644 drivers/input/misc/gpio_matrix.c
|
|
create mode 100644 drivers/input/misc/gpio_output.c
|
|
create mode 100644 include/linux/gpio_event.h
|
|
|
|
--- a/drivers/input/misc/Kconfig
|
|
+++ b/drivers/input/misc/Kconfig
|
|
@@ -212,6 +212,11 @@ config INPUT_SGI_BTNS
|
|
To compile this driver as a module, choose M here: the
|
|
module will be called sgi_btns.
|
|
|
|
+config INPUT_GPIO
|
|
+ tristate "GPIO driver support"
|
|
+ help
|
|
+ Say Y here if you want to support gpio based keys, wheels etc...
|
|
+
|
|
config HP_SDC_RTC
|
|
tristate "HP SDC Real Time Clock"
|
|
depends on (GSC || HP300) && SERIO
|
|
--- a/drivers/input/misc/Makefile
|
|
+++ b/drivers/input/misc/Makefile
|
|
@@ -25,3 +25,5 @@ obj-$(CONFIG_INPUT_UINPUT) += uinput.o
|
|
obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
|
|
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
|
|
obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o
|
|
+obj-$(CONFIG_INPUT_GPIO) += gpio_event.o gpio_matrix.o gpio_input.o gpio_output.o gpio_axis.o
|
|
+
|
|
--- /dev/null
|
|
+++ b/drivers/input/misc/gpio_axis.c
|
|
@@ -0,0 +1,180 @@
|
|
+/* drivers/input/misc/gpio_axis.c
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/gpio_event.h>
|
|
+#include <linux/interrupt.h>
|
|
+
|
|
+struct gpio_axis_state {
|
|
+ struct input_dev *input_dev;
|
|
+ struct gpio_event_axis_info *info;
|
|
+ uint32_t pos;
|
|
+};
|
|
+
|
|
+uint16_t gpio_axis_4bit_gray_map_table[] = {
|
|
+ [0x0] = 0x0, [0x1] = 0x1, /* 0000 0001 */
|
|
+ [0x3] = 0x2, [0x2] = 0x3, /* 0011 0010 */
|
|
+ [0x6] = 0x4, [0x7] = 0x5, /* 0110 0111 */
|
|
+ [0x5] = 0x6, [0x4] = 0x7, /* 0101 0100 */
|
|
+ [0xc] = 0x8, [0xd] = 0x9, /* 1100 1101 */
|
|
+ [0xf] = 0xa, [0xe] = 0xb, /* 1111 1110 */
|
|
+ [0xa] = 0xc, [0xb] = 0xd, /* 1010 1011 */
|
|
+ [0x9] = 0xe, [0x8] = 0xf, /* 1001 1000 */
|
|
+};
|
|
+uint16_t gpio_axis_4bit_gray_map(struct gpio_event_axis_info *info, uint16_t in)
|
|
+{
|
|
+ return gpio_axis_4bit_gray_map_table[in];
|
|
+}
|
|
+
|
|
+uint16_t gpio_axis_5bit_singletrack_map_table[] = {
|
|
+ [0x10] = 0x00, [0x14] = 0x01, [0x1c] = 0x02, /* 10000 10100 11100 */
|
|
+ [0x1e] = 0x03, [0x1a] = 0x04, [0x18] = 0x05, /* 11110 11010 11000 */
|
|
+ [0x08] = 0x06, [0x0a] = 0x07, [0x0e] = 0x08, /* 01000 01010 01110 */
|
|
+ [0x0f] = 0x09, [0x0d] = 0x0a, [0x0c] = 0x0b, /* 01111 01101 01100 */
|
|
+ [0x04] = 0x0c, [0x05] = 0x0d, [0x07] = 0x0e, /* 00100 00101 00111 */
|
|
+ [0x17] = 0x0f, [0x16] = 0x10, [0x06] = 0x11, /* 10111 10110 00110 */
|
|
+ [0x02] = 0x12, [0x12] = 0x13, [0x13] = 0x14, /* 00010 10010 10011 */
|
|
+ [0x1b] = 0x15, [0x0b] = 0x16, [0x03] = 0x17, /* 11011 01011 00011 */
|
|
+ [0x01] = 0x18, [0x09] = 0x19, [0x19] = 0x1a, /* 00001 01001 11001 */
|
|
+ [0x1d] = 0x1b, [0x15] = 0x1c, [0x11] = 0x1d, /* 11101 10101 10001 */
|
|
+};
|
|
+uint16_t gpio_axis_5bit_singletrack_map(
|
|
+ struct gpio_event_axis_info *info, uint16_t in)
|
|
+{
|
|
+ return gpio_axis_5bit_singletrack_map_table[in];
|
|
+}
|
|
+
|
|
+static void gpio_event_update_axis(struct gpio_axis_state *as, int report)
|
|
+{
|
|
+ struct gpio_event_axis_info *ai = as->info;
|
|
+ int i;
|
|
+ int change;
|
|
+ uint16_t state = 0;
|
|
+ uint16_t pos;
|
|
+ uint16_t old_pos = as->pos;
|
|
+ for (i = ai->count - 1; i >= 0; i--)
|
|
+ state = (state << 1) | gpio_get_value(ai->gpio[i]);
|
|
+ pos = ai->map(ai, state);
|
|
+ if (ai->flags & GPIOEAF_PRINT_RAW)
|
|
+ pr_info("axis %d-%d raw %x, pos %d -> %d\n",
|
|
+ ai->type, ai->code, state, old_pos, pos);
|
|
+ if (report && pos != old_pos) {
|
|
+ if (ai->type == EV_REL) {
|
|
+ change = (ai->decoded_size + pos - old_pos) %
|
|
+ ai->decoded_size;
|
|
+ if (change > ai->decoded_size / 2)
|
|
+ change -= ai->decoded_size;
|
|
+ if (change == ai->decoded_size / 2) {
|
|
+ if (ai->flags & GPIOEAF_PRINT_EVENT)
|
|
+ pr_info("axis %d-%d unknown direction, "
|
|
+ "pos %d -> %d\n", ai->type,
|
|
+ ai->code, old_pos, pos);
|
|
+ change = 0; /* no closest direction */
|
|
+ }
|
|
+ if (ai->flags & GPIOEAF_PRINT_EVENT)
|
|
+ pr_info("axis %d-%d change %d\n",
|
|
+ ai->type, ai->code, change);
|
|
+ input_report_rel(as->input_dev, ai->code, change);
|
|
+ } else {
|
|
+ if (ai->flags & GPIOEAF_PRINT_EVENT)
|
|
+ pr_info("axis %d-%d now %d\n",
|
|
+ ai->type, ai->code, pos);
|
|
+ input_event(as->input_dev, ai->type, ai->code, pos);
|
|
+ }
|
|
+ input_sync(as->input_dev);
|
|
+ }
|
|
+ as->pos = pos;
|
|
+}
|
|
+
|
|
+static irqreturn_t gpio_axis_irq_handler(int irq, void *dev_id)
|
|
+{
|
|
+ struct gpio_axis_state *as = dev_id;
|
|
+ gpio_event_update_axis(as, 1);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+int gpio_event_axis_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func)
|
|
+{
|
|
+ int ret;
|
|
+ int i;
|
|
+ int irq;
|
|
+ struct gpio_event_axis_info *ai;
|
|
+ struct gpio_axis_state *as;
|
|
+
|
|
+ ai = container_of(info, struct gpio_event_axis_info, info);
|
|
+ if (func == GPIO_EVENT_FUNC_SUSPEND) {
|
|
+ for (i = 0; i < ai->count; i++)
|
|
+ disable_irq(gpio_to_irq(ai->gpio[i]));
|
|
+ return 0;
|
|
+ }
|
|
+ if (func == GPIO_EVENT_FUNC_RESUME) {
|
|
+ for (i = 0; i < ai->count; i++)
|
|
+ enable_irq(gpio_to_irq(ai->gpio[i]));
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_INIT) {
|
|
+ *data = as = kmalloc(sizeof(*as), GFP_KERNEL);
|
|
+ if (as == NULL) {
|
|
+ ret = -ENOMEM;
|
|
+ goto err_alloc_axis_state_failed;
|
|
+ }
|
|
+ as->input_dev = input_dev;
|
|
+ as->info = ai;
|
|
+
|
|
+ input_set_capability(input_dev, ai->type, ai->code);
|
|
+ if (ai->type == EV_ABS) {
|
|
+ input_set_abs_params(input_dev, ai->code, 0,
|
|
+ ai->decoded_size - 1, 0, 0);
|
|
+ }
|
|
+ for (i = 0; i < ai->count; i++) {
|
|
+ ret = gpio_request(ai->gpio[i], "gpio_event_axis");
|
|
+ if (ret < 0)
|
|
+ goto err_request_gpio_failed;
|
|
+ ret = gpio_direction_input(ai->gpio[i]);
|
|
+ if (ret < 0)
|
|
+ goto err_gpio_direction_input_failed;
|
|
+ ret = irq = gpio_to_irq(ai->gpio[i]);
|
|
+ if (ret < 0)
|
|
+ goto err_get_irq_num_failed;
|
|
+ ret = request_irq(irq, gpio_axis_irq_handler,
|
|
+ IRQF_TRIGGER_RISING |
|
|
+ IRQF_TRIGGER_FALLING,
|
|
+ "gpio_event_axis", as);
|
|
+ if (ret < 0)
|
|
+ goto err_request_irq_failed;
|
|
+ }
|
|
+ gpio_event_update_axis(as, 0);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ ret = 0;
|
|
+ as = *data;
|
|
+ for (i = ai->count - 1; i >= 0; i--) {
|
|
+ free_irq(gpio_to_irq(ai->gpio[i]), as);
|
|
+err_request_irq_failed:
|
|
+err_get_irq_num_failed:
|
|
+err_gpio_direction_input_failed:
|
|
+ gpio_free(ai->gpio[i]);
|
|
+err_request_gpio_failed:
|
|
+ ;
|
|
+ }
|
|
+ kfree(as);
|
|
+ *data = NULL;
|
|
+err_alloc_axis_state_failed:
|
|
+ return ret;
|
|
+}
|
|
--- /dev/null
|
|
+++ b/drivers/input/misc/gpio_event.c
|
|
@@ -0,0 +1,224 @@
|
|
+/* drivers/input/misc/gpio_event.c
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/earlysuspend.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/input.h>
|
|
+#include <linux/gpio_event.h>
|
|
+#include <linux/hrtimer.h>
|
|
+#include <linux/platform_device.h>
|
|
+
|
|
+struct gpio_event {
|
|
+ struct input_dev *input_dev;
|
|
+ const struct gpio_event_platform_data *info;
|
|
+ struct early_suspend early_suspend;
|
|
+ void *state[0];
|
|
+};
|
|
+
|
|
+static int gpio_input_event(
|
|
+ struct input_dev *dev, unsigned int type, unsigned int code, int value)
|
|
+{
|
|
+ int i;
|
|
+ int ret = 0;
|
|
+ int tmp_ret;
|
|
+ struct gpio_event_info **ii;
|
|
+ struct gpio_event *ip = input_get_drvdata(dev);
|
|
+
|
|
+ for (i = 0, ii = ip->info->info; i < ip->info->info_count; i++, ii++) {
|
|
+ if ((*ii)->event) {
|
|
+ tmp_ret = (*ii)->event(ip->input_dev, *ii,
|
|
+ &ip->state[i], type, code, value);
|
|
+ if (tmp_ret)
|
|
+ ret = tmp_ret;
|
|
+ }
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int gpio_event_call_all_func(struct gpio_event *ip, int func)
|
|
+{
|
|
+ int i;
|
|
+ int ret;
|
|
+ struct gpio_event_info **ii;
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_INIT || func == GPIO_EVENT_FUNC_RESUME) {
|
|
+ ii = ip->info->info;
|
|
+ for (i = 0; i < ip->info->info_count; i++, ii++) {
|
|
+ if ((*ii)->func == NULL) {
|
|
+ ret = -ENODEV;
|
|
+ pr_err("gpio_event_probe: Incomplete pdata, "
|
|
+ "no function\n");
|
|
+ goto err_no_func;
|
|
+ }
|
|
+ ret = (*ii)->func(ip->input_dev, *ii, &ip->state[i],
|
|
+ func);
|
|
+ if (ret) {
|
|
+ pr_err("gpio_event_probe: function failed\n");
|
|
+ goto err_func_failed;
|
|
+ }
|
|
+ }
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ ret = 0;
|
|
+ i = ip->info->info_count;
|
|
+ ii = ip->info->info + i;
|
|
+ while (i > 0) {
|
|
+ i--;
|
|
+ ii--;
|
|
+ (*ii)->func(ip->input_dev, *ii, &ip->state[i], func & ~1);
|
|
+err_func_failed:
|
|
+err_no_func:
|
|
+ ;
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+#ifdef CONFIG_HAS_EARLYSUSPEND
|
|
+void gpio_event_suspend(struct early_suspend *h)
|
|
+{
|
|
+ struct gpio_event *ip;
|
|
+ ip = container_of(h, struct gpio_event, early_suspend);
|
|
+ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_SUSPEND);
|
|
+ ip->info->power(ip->info, 0);
|
|
+}
|
|
+
|
|
+void gpio_event_resume(struct early_suspend *h)
|
|
+{
|
|
+ struct gpio_event *ip;
|
|
+ ip = container_of(h, struct gpio_event, early_suspend);
|
|
+ ip->info->power(ip->info, 1);
|
|
+ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_RESUME);
|
|
+}
|
|
+#endif
|
|
+
|
|
+static int __init gpio_event_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int err;
|
|
+ struct gpio_event *ip;
|
|
+ struct input_dev *input_dev;
|
|
+ struct gpio_event_platform_data *event_info;
|
|
+
|
|
+ event_info = pdev->dev.platform_data;
|
|
+ if (event_info == NULL) {
|
|
+ pr_err("gpio_event_probe: No pdata\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+ if (event_info->name == NULL ||
|
|
+ event_info->info == NULL ||
|
|
+ event_info->info_count == 0) {
|
|
+ pr_err("gpio_event_probe: Incomplete pdata\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+ ip = kzalloc(sizeof(*ip) +
|
|
+ sizeof(ip->state[0]) * event_info->info_count, GFP_KERNEL);
|
|
+ if (ip == NULL) {
|
|
+ err = -ENOMEM;
|
|
+ pr_err("gpio_event_probe: Failed to allocate private data\n");
|
|
+ goto err_kp_alloc_failed;
|
|
+ }
|
|
+ platform_set_drvdata(pdev, ip);
|
|
+
|
|
+ input_dev = input_allocate_device();
|
|
+ if (input_dev == NULL) {
|
|
+ err = -ENOMEM;
|
|
+ pr_err("gpio_event_probe: Failed to allocate input device\n");
|
|
+ goto err_input_dev_alloc_failed;
|
|
+ }
|
|
+ input_set_drvdata(input_dev, ip);
|
|
+ ip->input_dev = input_dev;
|
|
+ ip->info = event_info;
|
|
+ if (event_info->power) {
|
|
+#ifdef CONFIG_HAS_EARLYSUSPEND
|
|
+ ip->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
|
|
+ ip->early_suspend.suspend = gpio_event_suspend;
|
|
+ ip->early_suspend.resume = gpio_event_resume;
|
|
+ register_early_suspend(&ip->early_suspend);
|
|
+#endif
|
|
+ ip->info->power(ip->info, 1);
|
|
+ }
|
|
+
|
|
+ input_dev->name = ip->info->name;
|
|
+ input_dev->event = gpio_input_event;
|
|
+
|
|
+ err = gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_INIT);
|
|
+ if (err)
|
|
+ goto err_call_all_func_failed;
|
|
+
|
|
+ err = input_register_device(input_dev);
|
|
+ if (err) {
|
|
+ pr_err("gpio_event_probe: Unable to register %s input device\n",
|
|
+ input_dev->name);
|
|
+ goto err_input_register_device_failed;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_input_register_device_failed:
|
|
+ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT);
|
|
+err_call_all_func_failed:
|
|
+ if (event_info->power) {
|
|
+#ifdef CONFIG_HAS_EARLYSUSPEND
|
|
+ unregister_early_suspend(&ip->early_suspend);
|
|
+#endif
|
|
+ ip->info->power(ip->info, 0);
|
|
+ }
|
|
+ input_free_device(input_dev);
|
|
+err_input_dev_alloc_failed:
|
|
+ kfree(ip);
|
|
+err_kp_alloc_failed:
|
|
+ return err;
|
|
+}
|
|
+
|
|
+static int gpio_event_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct gpio_event *ip = platform_get_drvdata(pdev);
|
|
+
|
|
+ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT);
|
|
+ if (ip->info->power) {
|
|
+#ifdef CONFIG_HAS_EARLYSUSPEND
|
|
+ unregister_early_suspend(&ip->early_suspend);
|
|
+#endif
|
|
+ ip->info->power(ip->info, 0);
|
|
+ }
|
|
+ input_unregister_device(ip->input_dev);
|
|
+ kfree(ip);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct platform_driver gpio_event_driver = {
|
|
+ .probe = gpio_event_probe,
|
|
+ .remove = gpio_event_remove,
|
|
+ .driver = {
|
|
+ .name = GPIO_EVENT_DEV_NAME,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __devinit gpio_event_init(void)
|
|
+{
|
|
+ return platform_driver_register(&gpio_event_driver);
|
|
+}
|
|
+
|
|
+static void __exit gpio_event_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&gpio_event_driver);
|
|
+}
|
|
+
|
|
+module_init(gpio_event_init);
|
|
+module_exit(gpio_event_exit);
|
|
+
|
|
+MODULE_DESCRIPTION("GPIO Event Driver");
|
|
+MODULE_LICENSE("GPL");
|
|
+
|
|
--- /dev/null
|
|
+++ b/drivers/input/misc/gpio_input.c
|
|
@@ -0,0 +1,343 @@
|
|
+/* drivers/input/misc/gpio_input.c
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/gpio_event.h>
|
|
+#include <linux/hrtimer.h>
|
|
+#include <linux/input.h>
|
|
+#include <linux/interrupt.h>
|
|
+#include <linux/wakelock.h>
|
|
+
|
|
+enum {
|
|
+ DEBOUNCE_UNSTABLE = BIT(0), /* Got irq, while debouncing */
|
|
+ DEBOUNCE_PRESSED = BIT(1),
|
|
+ DEBOUNCE_NOTPRESSED = BIT(2),
|
|
+ DEBOUNCE_WAIT_IRQ = BIT(3), /* Stable irq state */
|
|
+ DEBOUNCE_POLL = BIT(4), /* Stable polling state */
|
|
+
|
|
+ DEBOUNCE_UNKNOWN =
|
|
+ DEBOUNCE_PRESSED | DEBOUNCE_NOTPRESSED,
|
|
+};
|
|
+
|
|
+struct gpio_key_state {
|
|
+ struct gpio_input_state *ds;
|
|
+ uint8_t debounce;
|
|
+};
|
|
+
|
|
+struct gpio_input_state {
|
|
+ struct input_dev *input_dev;
|
|
+ const struct gpio_event_input_info *info;
|
|
+ struct hrtimer timer;
|
|
+ int use_irq;
|
|
+ int debounce_count;
|
|
+ spinlock_t irq_lock;
|
|
+ struct wake_lock wake_lock;
|
|
+ struct gpio_key_state key_state[0];
|
|
+};
|
|
+
|
|
+static enum hrtimer_restart gpio_event_input_timer_func(struct hrtimer *timer)
|
|
+{
|
|
+ int i;
|
|
+ int pressed;
|
|
+ struct gpio_input_state *ds =
|
|
+ container_of(timer, struct gpio_input_state, timer);
|
|
+ unsigned gpio_flags = ds->info->flags;
|
|
+ unsigned npolarity;
|
|
+ int nkeys = ds->info->keymap_size;
|
|
+ const struct gpio_event_direct_entry *key_entry;
|
|
+ struct gpio_key_state *key_state;
|
|
+ unsigned long irqflags;
|
|
+ uint8_t debounce;
|
|
+
|
|
+#if 0
|
|
+ key_entry = kp->keys_info->keymap;
|
|
+ key_state = kp->key_state;
|
|
+ for (i = 0; i < nkeys; i++, key_entry++, key_state++)
|
|
+ pr_info("gpio_read_detect_status %d %d\n", key_entry->gpio,
|
|
+ gpio_read_detect_status(key_entry->gpio));
|
|
+#endif
|
|
+ key_entry = ds->info->keymap;
|
|
+ key_state = ds->key_state;
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ for (i = 0; i < nkeys; i++, key_entry++, key_state++) {
|
|
+ debounce = key_state->debounce;
|
|
+ if (debounce & DEBOUNCE_WAIT_IRQ)
|
|
+ continue;
|
|
+ if (key_state->debounce & DEBOUNCE_UNSTABLE) {
|
|
+ debounce = key_state->debounce = DEBOUNCE_UNKNOWN;
|
|
+ enable_irq(gpio_to_irq(key_entry->gpio));
|
|
+ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
|
|
+ "(%d) continue debounce\n",
|
|
+ ds->info->type, key_entry->code,
|
|
+ i, key_entry->gpio);
|
|
+ }
|
|
+ npolarity = !(gpio_flags & GPIOEDF_ACTIVE_HIGH);
|
|
+ pressed = gpio_get_value(key_entry->gpio) ^ npolarity;
|
|
+ if (debounce & DEBOUNCE_POLL) {
|
|
+ if (pressed == !(debounce & DEBOUNCE_PRESSED)) {
|
|
+ ds->debounce_count++;
|
|
+ key_state->debounce = DEBOUNCE_UNKNOWN;
|
|
+ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
|
|
+ pr_info("gpio_keys_scan_keys: key %x-"
|
|
+ "%x, %d (%d) start debounce\n",
|
|
+ ds->info->type, key_entry->code,
|
|
+ i, key_entry->gpio);
|
|
+ }
|
|
+ continue;
|
|
+ }
|
|
+ if (pressed && (debounce & DEBOUNCE_NOTPRESSED)) {
|
|
+ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
|
|
+ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
|
|
+ "(%d) debounce pressed 1\n",
|
|
+ ds->info->type, key_entry->code,
|
|
+ i, key_entry->gpio);
|
|
+ key_state->debounce = DEBOUNCE_PRESSED;
|
|
+ continue;
|
|
+ }
|
|
+ if (!pressed && (debounce & DEBOUNCE_PRESSED)) {
|
|
+ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
|
|
+ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
|
|
+ "(%d) debounce pressed 0\n",
|
|
+ ds->info->type, key_entry->code,
|
|
+ i, key_entry->gpio);
|
|
+ key_state->debounce = DEBOUNCE_NOTPRESSED;
|
|
+ continue;
|
|
+ }
|
|
+ /* key is stable */
|
|
+ ds->debounce_count--;
|
|
+ if (ds->use_irq)
|
|
+ key_state->debounce |= DEBOUNCE_WAIT_IRQ;
|
|
+ else
|
|
+ key_state->debounce |= DEBOUNCE_POLL;
|
|
+ if (gpio_flags & GPIOEDF_PRINT_KEYS)
|
|
+ pr_info("gpio_keys_scan_keys: key %x-%x, %d (%d) "
|
|
+ "changed to %d\n", ds->info->type,
|
|
+ key_entry->code, i, key_entry->gpio, pressed);
|
|
+ input_event(ds->input_dev, ds->info->type,
|
|
+ key_entry->code, pressed);
|
|
+ }
|
|
+
|
|
+#if 0
|
|
+ key_entry = kp->keys_info->keymap;
|
|
+ key_state = kp->key_state;
|
|
+ for (i = 0; i < nkeys; i++, key_entry++, key_state++) {
|
|
+ pr_info("gpio_read_detect_status %d %d\n", key_entry->gpio,
|
|
+ gpio_read_detect_status(key_entry->gpio));
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ if (ds->debounce_count)
|
|
+ hrtimer_start(timer, ds->info->debounce_time, HRTIMER_MODE_REL);
|
|
+ else if (!ds->use_irq)
|
|
+ hrtimer_start(timer, ds->info->poll_time, HRTIMER_MODE_REL);
|
|
+ else
|
|
+ wake_unlock(&ds->wake_lock);
|
|
+
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+
|
|
+ return HRTIMER_NORESTART;
|
|
+}
|
|
+
|
|
+static irqreturn_t gpio_event_input_irq_handler(int irq, void *dev_id)
|
|
+{
|
|
+ struct gpio_key_state *ks = dev_id;
|
|
+ struct gpio_input_state *ds = ks->ds;
|
|
+ int keymap_index = ks - ds->key_state;
|
|
+ const struct gpio_event_direct_entry *key_entry;
|
|
+ unsigned long irqflags;
|
|
+ int pressed;
|
|
+
|
|
+ if (!ds->use_irq)
|
|
+ return IRQ_HANDLED;
|
|
+
|
|
+ key_entry = &ds->info->keymap[keymap_index];
|
|
+
|
|
+ if (ds->info->debounce_time.tv64) {
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ if (ks->debounce & DEBOUNCE_WAIT_IRQ) {
|
|
+ ks->debounce = DEBOUNCE_UNKNOWN;
|
|
+ if (ds->debounce_count++ == 0) {
|
|
+ wake_lock(&ds->wake_lock);
|
|
+ hrtimer_start(
|
|
+ &ds->timer, ds->info->debounce_time,
|
|
+ HRTIMER_MODE_REL);
|
|
+ }
|
|
+ if (ds->info->flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
|
|
+ pr_info("gpio_event_input_irq_handler: "
|
|
+ "key %x-%x, %d (%d) start debounce\n",
|
|
+ ds->info->type, key_entry->code,
|
|
+ keymap_index, key_entry->gpio);
|
|
+ } else {
|
|
+ disable_irq(irq);
|
|
+ ks->debounce = DEBOUNCE_UNSTABLE;
|
|
+ }
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+ } else {
|
|
+ pressed = gpio_get_value(key_entry->gpio) ^
|
|
+ !(ds->info->flags & GPIOEDF_ACTIVE_HIGH);
|
|
+ if (ds->info->flags & GPIOEDF_PRINT_KEYS)
|
|
+ pr_info("gpio_event_input_irq_handler: key %x-%x, %d "
|
|
+ "(%d) changed to %d\n",
|
|
+ ds->info->type, key_entry->code, keymap_index,
|
|
+ key_entry->gpio, pressed);
|
|
+ input_event(ds->input_dev, ds->info->type,
|
|
+ key_entry->code, pressed);
|
|
+ }
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static int gpio_event_input_request_irqs(struct gpio_input_state *ds)
|
|
+{
|
|
+ int i;
|
|
+ int err;
|
|
+ unsigned int irq;
|
|
+ unsigned long req_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
|
|
+
|
|
+ for (i = 0; i < ds->info->keymap_size; i++) {
|
|
+ err = irq = gpio_to_irq(ds->info->keymap[i].gpio);
|
|
+ if (err < 0)
|
|
+ goto err_gpio_get_irq_num_failed;
|
|
+ err = request_irq(irq, gpio_event_input_irq_handler,
|
|
+ req_flags, "gpio_keys", &ds->key_state[i]);
|
|
+ if (err) {
|
|
+ pr_err("gpio_event_input_request_irqs: request_irq "
|
|
+ "failed for input %d, irq %d\n",
|
|
+ ds->info->keymap[i].gpio, irq);
|
|
+ goto err_request_irq_failed;
|
|
+ }
|
|
+ enable_irq_wake(irq);
|
|
+ }
|
|
+ return 0;
|
|
+
|
|
+ for (i = ds->info->keymap_size - 1; i >= 0; i--) {
|
|
+ free_irq(gpio_to_irq(ds->info->keymap[i].gpio),
|
|
+ &ds->key_state[i]);
|
|
+err_request_irq_failed:
|
|
+err_gpio_get_irq_num_failed:
|
|
+ ;
|
|
+ }
|
|
+ return err;
|
|
+}
|
|
+
|
|
+int gpio_event_input_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func)
|
|
+{
|
|
+ int ret;
|
|
+ int i;
|
|
+ unsigned long irqflags;
|
|
+ struct gpio_event_input_info *di;
|
|
+ struct gpio_input_state *ds = *data;
|
|
+
|
|
+ di = container_of(info, struct gpio_event_input_info, info);
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_SUSPEND) {
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ if (ds->use_irq)
|
|
+ for (i = 0; i < di->keymap_size; i++)
|
|
+ disable_irq(gpio_to_irq(di->keymap[i].gpio));
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+ hrtimer_cancel(&ds->timer);
|
|
+ return 0;
|
|
+ }
|
|
+ if (func == GPIO_EVENT_FUNC_RESUME) {
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ if (ds->use_irq)
|
|
+ for (i = 0; i < di->keymap_size; i++)
|
|
+ enable_irq(gpio_to_irq(di->keymap[i].gpio));
|
|
+ hrtimer_start(&ds->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_INIT) {
|
|
+ if (ktime_to_ns(di->poll_time) <= 0)
|
|
+ di->poll_time = ktime_set(0, 20 * NSEC_PER_MSEC);
|
|
+
|
|
+ *data = ds = kzalloc(sizeof(*ds) + sizeof(ds->key_state[0]) *
|
|
+ di->keymap_size, GFP_KERNEL);
|
|
+ if (ds == NULL) {
|
|
+ ret = -ENOMEM;
|
|
+ pr_err("gpio_event_input_func: "
|
|
+ "Failed to allocate private data\n");
|
|
+ goto err_ds_alloc_failed;
|
|
+ }
|
|
+ ds->debounce_count = di->keymap_size;
|
|
+ ds->input_dev = input_dev;
|
|
+ ds->info = di;
|
|
+ wake_lock_init(&ds->wake_lock, WAKE_LOCK_SUSPEND, "gpio_input");
|
|
+ spin_lock_init(&ds->irq_lock);
|
|
+
|
|
+ for (i = 0; i < di->keymap_size; i++) {
|
|
+ input_set_capability(input_dev, di->type,
|
|
+ di->keymap[i].code);
|
|
+ ds->key_state[i].ds = ds;
|
|
+ ds->key_state[i].debounce = DEBOUNCE_UNKNOWN;
|
|
+ }
|
|
+
|
|
+ for (i = 0; i < di->keymap_size; i++) {
|
|
+ ret = gpio_request(di->keymap[i].gpio, "gpio_kp_in");
|
|
+ if (ret) {
|
|
+ pr_err("gpio_event_input_func: gpio_request "
|
|
+ "failed for %d\n", di->keymap[i].gpio);
|
|
+ goto err_gpio_request_failed;
|
|
+ }
|
|
+ ret = gpio_direction_input(di->keymap[i].gpio);
|
|
+ if (ret) {
|
|
+ pr_err("gpio_event_input_func: "
|
|
+ "gpio_direction_input failed for %d\n",
|
|
+ di->keymap[i].gpio);
|
|
+ goto err_gpio_configure_failed;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ ret = gpio_event_input_request_irqs(ds);
|
|
+
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ ds->use_irq = ret == 0;
|
|
+
|
|
+ pr_info("GPIO Input Driver: Start gpio inputs for %s in %s "
|
|
+ "mode\n",
|
|
+ input_dev->name, ret == 0 ? "interrupt" : "polling");
|
|
+
|
|
+ hrtimer_init(&ds->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
+ ds->timer.function = gpio_event_input_timer_func;
|
|
+ hrtimer_start(&ds->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ ret = 0;
|
|
+ spin_lock_irqsave(&ds->irq_lock, irqflags);
|
|
+ hrtimer_cancel(&ds->timer);
|
|
+ if (ds->use_irq) {
|
|
+ for (i = di->keymap_size - 1; i >= 0; i--) {
|
|
+ free_irq(gpio_to_irq(di->keymap[i].gpio),
|
|
+ &ds->key_state[i]);
|
|
+ }
|
|
+ }
|
|
+ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
|
|
+
|
|
+ for (i = di->keymap_size - 1; i >= 0; i--) {
|
|
+err_gpio_configure_failed:
|
|
+ gpio_free(di->keymap[i].gpio);
|
|
+err_gpio_request_failed:
|
|
+ ;
|
|
+ }
|
|
+ wake_lock_destroy(&ds->wake_lock);
|
|
+ kfree(ds);
|
|
+err_ds_alloc_failed:
|
|
+ return ret;
|
|
+}
|
|
--- /dev/null
|
|
+++ b/drivers/input/misc/gpio_matrix.c
|
|
@@ -0,0 +1,406 @@
|
|
+/* drivers/input/misc/gpio_matrix.c
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/gpio_event.h>
|
|
+#include <linux/hrtimer.h>
|
|
+#include <linux/interrupt.h>
|
|
+#include <linux/wakelock.h>
|
|
+
|
|
+struct gpio_kp {
|
|
+ struct input_dev *input_dev;
|
|
+ struct gpio_event_matrix_info *keypad_info;
|
|
+ struct hrtimer timer;
|
|
+ struct wake_lock wake_lock;
|
|
+ int current_output;
|
|
+ unsigned int use_irq:1;
|
|
+ unsigned int key_state_changed:1;
|
|
+ unsigned int last_key_state_changed:1;
|
|
+ unsigned int some_keys_pressed:2;
|
|
+ unsigned long keys_pressed[0];
|
|
+};
|
|
+
|
|
+static void clear_phantom_key(struct gpio_kp *kp, int out, int in)
|
|
+{
|
|
+ struct gpio_event_matrix_info *mi = kp->keypad_info;
|
|
+ int key_index = out * mi->ninputs + in;
|
|
+ unsigned short keycode = mi->keymap[key_index];;
|
|
+
|
|
+ if (!test_bit(keycode, kp->input_dev->key)) {
|
|
+ if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
|
|
+ pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
|
|
+ "cleared\n", keycode, out, in,
|
|
+ mi->output_gpios[out], mi->input_gpios[in]);
|
|
+ __clear_bit(key_index, kp->keys_pressed);
|
|
+ } else {
|
|
+ if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
|
|
+ pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
|
|
+ "not cleared\n", keycode, out, in,
|
|
+ mi->output_gpios[out], mi->input_gpios[in]);
|
|
+ }
|
|
+}
|
|
+
|
|
+static int restore_keys_for_input(struct gpio_kp *kp, int out, int in)
|
|
+{
|
|
+ int rv = 0;
|
|
+ int key_index;
|
|
+
|
|
+ key_index = out * kp->keypad_info->ninputs + in;
|
|
+ while (out < kp->keypad_info->noutputs) {
|
|
+ if (test_bit(key_index, kp->keys_pressed)) {
|
|
+ rv = 1;
|
|
+ clear_phantom_key(kp, out, in);
|
|
+ }
|
|
+ key_index += kp->keypad_info->ninputs;
|
|
+ out++;
|
|
+ }
|
|
+ return rv;
|
|
+}
|
|
+
|
|
+static void remove_phantom_keys(struct gpio_kp *kp)
|
|
+{
|
|
+ int out, in, inp;
|
|
+ int key_index;
|
|
+
|
|
+ if (kp->some_keys_pressed < 3)
|
|
+ return;
|
|
+
|
|
+ for (out = 0; out < kp->keypad_info->noutputs; out++) {
|
|
+ inp = -1;
|
|
+ key_index = out * kp->keypad_info->ninputs;
|
|
+ for (in = 0; in < kp->keypad_info->ninputs; in++, key_index++) {
|
|
+ if (test_bit(key_index, kp->keys_pressed)) {
|
|
+ if (inp == -1) {
|
|
+ inp = in;
|
|
+ continue;
|
|
+ }
|
|
+ if (inp >= 0) {
|
|
+ if (!restore_keys_for_input(kp, out + 1,
|
|
+ inp))
|
|
+ break;
|
|
+ clear_phantom_key(kp, out, inp);
|
|
+ inp = -2;
|
|
+ }
|
|
+ restore_keys_for_input(kp, out, in);
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+static void report_key(struct gpio_kp *kp, int key_index, int out, int in)
|
|
+{
|
|
+ struct gpio_event_matrix_info *mi = kp->keypad_info;
|
|
+ int pressed = test_bit(key_index, kp->keys_pressed);
|
|
+ unsigned short keycode = mi->keymap[key_index];
|
|
+ if (pressed != test_bit(keycode, kp->input_dev->key)) {
|
|
+ if (keycode == KEY_RESERVED) {
|
|
+ if (mi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS)
|
|
+ pr_info("gpiomatrix: unmapped key, %d-%d "
|
|
+ "(%d-%d) changed to %d\n",
|
|
+ out, in, mi->output_gpios[out],
|
|
+ mi->input_gpios[in], pressed);
|
|
+ } else {
|
|
+ if (mi->flags & GPIOKPF_PRINT_MAPPED_KEYS)
|
|
+ pr_info("gpiomatrix: key %x, %d-%d (%d-%d) "
|
|
+ "changed to %d\n", keycode,
|
|
+ out, in, mi->output_gpios[out],
|
|
+ mi->input_gpios[in], pressed);
|
|
+ input_report_key(kp->input_dev, keycode, pressed);
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+static enum hrtimer_restart gpio_keypad_timer_func(struct hrtimer *timer)
|
|
+{
|
|
+ int out, in;
|
|
+ int key_index;
|
|
+ int gpio;
|
|
+ struct gpio_kp *kp = container_of(timer, struct gpio_kp, timer);
|
|
+ struct gpio_event_matrix_info *mi = kp->keypad_info;
|
|
+ unsigned gpio_keypad_flags = mi->flags;
|
|
+ unsigned polarity = !!(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH);
|
|
+
|
|
+ out = kp->current_output;
|
|
+ if (out == mi->noutputs) {
|
|
+ out = 0;
|
|
+ kp->last_key_state_changed = kp->key_state_changed;
|
|
+ kp->key_state_changed = 0;
|
|
+ kp->some_keys_pressed = 0;
|
|
+ } else {
|
|
+ key_index = out * mi->ninputs;
|
|
+ for (in = 0; in < mi->ninputs; in++, key_index++) {
|
|
+ gpio = mi->input_gpios[in];
|
|
+ if (gpio_get_value(gpio) ^ !polarity) {
|
|
+ if (kp->some_keys_pressed < 3)
|
|
+ kp->some_keys_pressed++;
|
|
+ kp->key_state_changed |= !__test_and_set_bit(
|
|
+ key_index, kp->keys_pressed);
|
|
+ } else
|
|
+ kp->key_state_changed |= __test_and_clear_bit(
|
|
+ key_index, kp->keys_pressed);
|
|
+ }
|
|
+ gpio = mi->output_gpios[out];
|
|
+ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
|
|
+ gpio_set_value(gpio, !polarity);
|
|
+ else
|
|
+ gpio_direction_input(gpio);
|
|
+ out++;
|
|
+ }
|
|
+ kp->current_output = out;
|
|
+ if (out < mi->noutputs) {
|
|
+ gpio = mi->output_gpios[out];
|
|
+ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
|
|
+ gpio_set_value(gpio, polarity);
|
|
+ else
|
|
+ gpio_direction_output(gpio, polarity);
|
|
+ hrtimer_start(timer, mi->settle_time, HRTIMER_MODE_REL);
|
|
+ return HRTIMER_NORESTART;
|
|
+ }
|
|
+ if (gpio_keypad_flags & GPIOKPF_DEBOUNCE) {
|
|
+ if (kp->key_state_changed) {
|
|
+ hrtimer_start(&kp->timer, mi->debounce_delay,
|
|
+ HRTIMER_MODE_REL);
|
|
+ return HRTIMER_NORESTART;
|
|
+ }
|
|
+ kp->key_state_changed = kp->last_key_state_changed;
|
|
+ }
|
|
+ if (kp->key_state_changed) {
|
|
+ if (gpio_keypad_flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS)
|
|
+ remove_phantom_keys(kp);
|
|
+ key_index = 0;
|
|
+ for (out = 0; out < mi->noutputs; out++)
|
|
+ for (in = 0; in < mi->ninputs; in++, key_index++)
|
|
+ report_key(kp, key_index, out, in);
|
|
+ }
|
|
+ if (!kp->use_irq || kp->some_keys_pressed) {
|
|
+ hrtimer_start(timer, mi->poll_time, HRTIMER_MODE_REL);
|
|
+ return HRTIMER_NORESTART;
|
|
+ }
|
|
+
|
|
+ /* No keys are pressed, reenable interrupt */
|
|
+ for (out = 0; out < mi->noutputs; out++) {
|
|
+ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
|
|
+ gpio_set_value(mi->output_gpios[out], polarity);
|
|
+ else
|
|
+ gpio_direction_output(mi->output_gpios[out], polarity);
|
|
+ }
|
|
+ for (in = 0; in < mi->ninputs; in++)
|
|
+ enable_irq(gpio_to_irq(mi->input_gpios[in]));
|
|
+ wake_unlock(&kp->wake_lock);
|
|
+ return HRTIMER_NORESTART;
|
|
+}
|
|
+
|
|
+static irqreturn_t gpio_keypad_irq_handler(int irq_in, void *dev_id)
|
|
+{
|
|
+ int i;
|
|
+ struct gpio_kp *kp = dev_id;
|
|
+ struct gpio_event_matrix_info *mi = kp->keypad_info;
|
|
+ unsigned gpio_keypad_flags = mi->flags;
|
|
+
|
|
+ if (!kp->use_irq) /* ignore interrupt while registering the handler */
|
|
+ return IRQ_HANDLED;
|
|
+
|
|
+ for (i = 0; i < mi->ninputs; i++)
|
|
+ disable_irq(gpio_to_irq(mi->input_gpios[i]));
|
|
+ for (i = 0; i < mi->noutputs; i++) {
|
|
+ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
|
|
+ gpio_set_value(mi->output_gpios[i],
|
|
+ !(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH));
|
|
+ else
|
|
+ gpio_direction_input(mi->output_gpios[i]);
|
|
+ }
|
|
+ wake_lock(&kp->wake_lock);
|
|
+ hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static int gpio_keypad_request_irqs(struct gpio_kp *kp)
|
|
+{
|
|
+ int i;
|
|
+ int err;
|
|
+ unsigned int irq;
|
|
+ unsigned long request_flags;
|
|
+ struct gpio_event_matrix_info *mi = kp->keypad_info;
|
|
+
|
|
+ switch (mi->flags & (GPIOKPF_ACTIVE_HIGH|GPIOKPF_LEVEL_TRIGGERED_IRQ)) {
|
|
+ default:
|
|
+ request_flags = IRQF_TRIGGER_FALLING;
|
|
+ break;
|
|
+ case GPIOKPF_ACTIVE_HIGH:
|
|
+ request_flags = IRQF_TRIGGER_RISING;
|
|
+ break;
|
|
+ case GPIOKPF_LEVEL_TRIGGERED_IRQ:
|
|
+ request_flags = IRQF_TRIGGER_LOW;
|
|
+ break;
|
|
+ case GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_ACTIVE_HIGH:
|
|
+ request_flags = IRQF_TRIGGER_HIGH;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ for (i = 0; i < mi->ninputs; i++) {
|
|
+ err = irq = gpio_to_irq(mi->input_gpios[i]);
|
|
+ if (err < 0)
|
|
+ goto err_gpio_get_irq_num_failed;
|
|
+ err = request_irq(irq, gpio_keypad_irq_handler, request_flags,
|
|
+ "gpio_kp", kp);
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: request_irq failed for input %d, "
|
|
+ "irq %d\n", mi->input_gpios[i], irq);
|
|
+ goto err_request_irq_failed;
|
|
+ }
|
|
+ err = set_irq_wake(irq, 1);
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: set_irq_wake failed for input %d, "
|
|
+ "irq %d\n", mi->input_gpios[i], irq);
|
|
+ }
|
|
+ disable_irq(irq);
|
|
+ }
|
|
+ return 0;
|
|
+
|
|
+ for (i = mi->noutputs - 1; i >= 0; i--) {
|
|
+ free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
|
|
+err_request_irq_failed:
|
|
+err_gpio_get_irq_num_failed:
|
|
+ ;
|
|
+ }
|
|
+ return err;
|
|
+}
|
|
+
|
|
+int gpio_event_matrix_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func)
|
|
+{
|
|
+ int i;
|
|
+ int err;
|
|
+ int key_count;
|
|
+ struct gpio_kp *kp;
|
|
+ struct gpio_event_matrix_info *mi;
|
|
+
|
|
+ mi = container_of(info, struct gpio_event_matrix_info, info);
|
|
+ if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME) {
|
|
+ /* TODO: disable scanning */
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_INIT) {
|
|
+ if (mi->keymap == NULL ||
|
|
+ mi->input_gpios == NULL ||
|
|
+ mi->output_gpios == NULL) {
|
|
+ err = -ENODEV;
|
|
+ pr_err("gpiomatrix: Incomplete pdata\n");
|
|
+ goto err_invalid_platform_data;
|
|
+ }
|
|
+ key_count = mi->ninputs * mi->noutputs;
|
|
+
|
|
+ *data = kp = kzalloc(sizeof(*kp) + sizeof(kp->keys_pressed[0]) *
|
|
+ BITS_TO_LONGS(key_count), GFP_KERNEL);
|
|
+ if (kp == NULL) {
|
|
+ err = -ENOMEM;
|
|
+ pr_err("gpiomatrix: Failed to allocate private data\n");
|
|
+ goto err_kp_alloc_failed;
|
|
+ }
|
|
+ kp->input_dev = input_dev;
|
|
+ kp->keypad_info = mi;
|
|
+ set_bit(EV_KEY, input_dev->evbit);
|
|
+ for (i = 0; i < key_count; i++) {
|
|
+ if (mi->keymap[i])
|
|
+ set_bit(mi->keymap[i] & KEY_MAX,
|
|
+ input_dev->keybit);
|
|
+ }
|
|
+
|
|
+ for (i = 0; i < mi->noutputs; i++) {
|
|
+ if (gpio_cansleep(mi->output_gpios[i])) {
|
|
+ pr_err("gpiomatrix: unsupported output gpio %d,"
|
|
+ " can sleep\n", mi->output_gpios[i]);
|
|
+ err = -EINVAL;
|
|
+ goto err_request_output_gpio_failed;
|
|
+ }
|
|
+ err = gpio_request(mi->output_gpios[i], "gpio_kp_out");
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: gpio_request failed for "
|
|
+ "output %d\n", mi->output_gpios[i]);
|
|
+ goto err_request_output_gpio_failed;
|
|
+ }
|
|
+ if (mi->flags & GPIOKPF_DRIVE_INACTIVE)
|
|
+ err = gpio_direction_output(mi->output_gpios[i],
|
|
+ !(mi->flags & GPIOKPF_ACTIVE_HIGH));
|
|
+ else
|
|
+ err = gpio_direction_input(mi->output_gpios[i]);
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: gpio_configure failed for "
|
|
+ "output %d\n", mi->output_gpios[i]);
|
|
+ goto err_output_gpio_configure_failed;
|
|
+ }
|
|
+ }
|
|
+ for (i = 0; i < mi->ninputs; i++) {
|
|
+ err = gpio_request(mi->input_gpios[i], "gpio_kp_in");
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: gpio_request failed for "
|
|
+ "input %d\n", mi->input_gpios[i]);
|
|
+ goto err_request_input_gpio_failed;
|
|
+ }
|
|
+ err = gpio_direction_input(mi->input_gpios[i]);
|
|
+ if (err) {
|
|
+ pr_err("gpiomatrix: gpio_direction_input failed"
|
|
+ " for input %d\n", mi->input_gpios[i]);
|
|
+ goto err_gpio_direction_input_failed;
|
|
+ }
|
|
+ }
|
|
+ kp->current_output = mi->noutputs;
|
|
+ kp->key_state_changed = 1;
|
|
+
|
|
+ hrtimer_init(&kp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
+ kp->timer.function = gpio_keypad_timer_func;
|
|
+ wake_lock_init(&kp->wake_lock, WAKE_LOCK_SUSPEND, "gpio_kp");
|
|
+ err = gpio_keypad_request_irqs(kp);
|
|
+ kp->use_irq = err == 0;
|
|
+
|
|
+ pr_info("GPIO Matrix Keypad Driver: Start keypad matrix for %s "
|
|
+ "in %s mode\n", input_dev->name,
|
|
+ kp->use_irq ? "interrupt" : "polling");
|
|
+
|
|
+ if (kp->use_irq)
|
|
+ wake_lock(&kp->wake_lock);
|
|
+ hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
|
|
+
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ err = 0;
|
|
+ kp = *data;
|
|
+
|
|
+ if (kp->use_irq)
|
|
+ for (i = mi->noutputs - 1; i >= 0; i--)
|
|
+ free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
|
|
+
|
|
+ hrtimer_cancel(&kp->timer);
|
|
+ wake_lock_destroy(&kp->wake_lock);
|
|
+ for (i = mi->noutputs - 1; i >= 0; i--) {
|
|
+err_gpio_direction_input_failed:
|
|
+ gpio_free(mi->input_gpios[i]);
|
|
+err_request_input_gpio_failed:
|
|
+ ;
|
|
+ }
|
|
+ for (i = mi->noutputs - 1; i >= 0; i--) {
|
|
+err_output_gpio_configure_failed:
|
|
+ gpio_free(mi->output_gpios[i]);
|
|
+err_request_output_gpio_failed:
|
|
+ ;
|
|
+ }
|
|
+ kfree(kp);
|
|
+err_kp_alloc_failed:
|
|
+err_invalid_platform_data:
|
|
+ return err;
|
|
+}
|
|
--- /dev/null
|
|
+++ b/drivers/input/misc/gpio_output.c
|
|
@@ -0,0 +1,84 @@
|
|
+/* drivers/input/misc/gpio_output.c
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/gpio_event.h>
|
|
+
|
|
+int gpio_event_output_event(
|
|
+ struct input_dev *input_dev, struct gpio_event_info *info, void **data,
|
|
+ unsigned int type, unsigned int code, int value)
|
|
+{
|
|
+ int i;
|
|
+ struct gpio_event_output_info *oi;
|
|
+ oi = container_of(info, struct gpio_event_output_info, info);
|
|
+ if (type != oi->type)
|
|
+ return 0;
|
|
+ if (!(oi->flags & GPIOEDF_ACTIVE_HIGH))
|
|
+ value = !value;
|
|
+ for (i = 0; i < oi->keymap_size; i++)
|
|
+ if (code == oi->keymap[i].code)
|
|
+ gpio_set_value(oi->keymap[i].gpio, value);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+int gpio_event_output_func(
|
|
+ struct input_dev *input_dev, struct gpio_event_info *info, void **data,
|
|
+ int func)
|
|
+{
|
|
+ int ret;
|
|
+ int i;
|
|
+ struct gpio_event_output_info *oi;
|
|
+ oi = container_of(info, struct gpio_event_output_info, info);
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME)
|
|
+ return 0;
|
|
+
|
|
+ if (func == GPIO_EVENT_FUNC_INIT) {
|
|
+ int output_level = !(oi->flags & GPIOEDF_ACTIVE_HIGH);
|
|
+ for (i = 0; i < oi->keymap_size; i++)
|
|
+ input_set_capability(input_dev, oi->type,
|
|
+ oi->keymap[i].code);
|
|
+
|
|
+ for (i = 0; i < oi->keymap_size; i++) {
|
|
+ ret = gpio_request(oi->keymap[i].gpio,
|
|
+ "gpio_event_output");
|
|
+ if (ret) {
|
|
+ pr_err("gpio_event_output_func: gpio_request "
|
|
+ "failed for %d\n", oi->keymap[i].gpio);
|
|
+ goto err_gpio_request_failed;
|
|
+ }
|
|
+ ret = gpio_direction_output(oi->keymap[i].gpio,
|
|
+ output_level);
|
|
+ if (ret) {
|
|
+ pr_err("gpio_event_output_func: "
|
|
+ "gpio_direction_output failed for %d\n",
|
|
+ oi->keymap[i].gpio);
|
|
+ goto err_gpio_direction_output_failed;
|
|
+ }
|
|
+ }
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ ret = 0;
|
|
+ for (i = oi->keymap_size - 1; i >= 0; i--) {
|
|
+err_gpio_direction_output_failed:
|
|
+ gpio_free(oi->keymap[i].gpio);
|
|
+err_gpio_request_failed:
|
|
+ ;
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+
|
|
--- /dev/null
|
|
+++ b/include/linux/gpio_event.h
|
|
@@ -0,0 +1,154 @@
|
|
+/* include/linux/gpio_event.h
|
|
+ *
|
|
+ * Copyright (C) 2007 Google, Inc.
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#ifndef _LINUX_GPIO_EVENT_H
|
|
+#define _LINUX_GPIO_EVENT_H
|
|
+
|
|
+#include <linux/input.h>
|
|
+
|
|
+enum {
|
|
+ GPIO_EVENT_FUNC_UNINIT = 0x0,
|
|
+ GPIO_EVENT_FUNC_INIT = 0x1,
|
|
+ GPIO_EVENT_FUNC_SUSPEND = 0x2,
|
|
+ GPIO_EVENT_FUNC_RESUME = 0x3,
|
|
+};
|
|
+struct gpio_event_info {
|
|
+ int (*func)(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info,
|
|
+ void **data, int func);
|
|
+ int (*event)(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info,
|
|
+ void **data, unsigned int type,
|
|
+ unsigned int code, int value); /* out events */
|
|
+};
|
|
+
|
|
+struct gpio_event_platform_data {
|
|
+ const char *name;
|
|
+ struct gpio_event_info **info;
|
|
+ size_t info_count;
|
|
+ int (*power)(const struct gpio_event_platform_data *pdata, bool on);
|
|
+};
|
|
+
|
|
+#define GPIO_EVENT_DEV_NAME "gpio-event"
|
|
+
|
|
+/* Key matrix */
|
|
+
|
|
+enum gpio_event_matrix_flags {
|
|
+ /* unset: drive active output low, set: drive active output high */
|
|
+ GPIOKPF_ACTIVE_HIGH = 1U << 0,
|
|
+ GPIOKPF_DEBOUNCE = 1U << 1,
|
|
+ GPIOKPF_REMOVE_SOME_PHANTOM_KEYS = 1U << 2,
|
|
+ GPIOKPF_REMOVE_PHANTOM_KEYS = GPIOKPF_REMOVE_SOME_PHANTOM_KEYS |
|
|
+ GPIOKPF_DEBOUNCE,
|
|
+ GPIOKPF_DRIVE_INACTIVE = 1U << 3,
|
|
+ GPIOKPF_LEVEL_TRIGGERED_IRQ = 1U << 4,
|
|
+ GPIOKPF_PRINT_UNMAPPED_KEYS = 1U << 16,
|
|
+ GPIOKPF_PRINT_MAPPED_KEYS = 1U << 17,
|
|
+ GPIOKPF_PRINT_PHANTOM_KEYS = 1U << 18,
|
|
+};
|
|
+
|
|
+extern int gpio_event_matrix_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func);
|
|
+struct gpio_event_matrix_info {
|
|
+ /* initialize to gpio_event_matrix_func */
|
|
+ struct gpio_event_info info;
|
|
+ /* size must be ninputs * noutputs */
|
|
+ const unsigned short *keymap;
|
|
+ unsigned int *input_gpios;
|
|
+ unsigned int *output_gpios;
|
|
+ unsigned int ninputs;
|
|
+ unsigned int noutputs;
|
|
+ /* time to wait before reading inputs after driving each output */
|
|
+ ktime_t settle_time;
|
|
+ /* time to wait before scanning the keypad a second time */
|
|
+ ktime_t debounce_delay;
|
|
+ ktime_t poll_time;
|
|
+ unsigned flags;
|
|
+};
|
|
+
|
|
+/* Directly connected inputs and outputs */
|
|
+
|
|
+enum gpio_event_direct_flags {
|
|
+ GPIOEDF_ACTIVE_HIGH = 1U << 0,
|
|
+/* GPIOEDF_USE_DOWN_IRQ = 1U << 1, */
|
|
+/* GPIOEDF_USE_IRQ = (1U << 2) | GPIOIDF_USE_DOWN_IRQ, */
|
|
+ GPIOEDF_PRINT_KEYS = 1U << 8,
|
|
+ GPIOEDF_PRINT_KEY_DEBOUNCE = 1U << 9,
|
|
+};
|
|
+
|
|
+struct gpio_event_direct_entry {
|
|
+ uint32_t gpio:23;
|
|
+ uint32_t code:9;
|
|
+};
|
|
+
|
|
+/* inputs */
|
|
+extern int gpio_event_input_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func);
|
|
+struct gpio_event_input_info {
|
|
+ /* initialize to gpio_event_input_func */
|
|
+ struct gpio_event_info info;
|
|
+ ktime_t debounce_time;
|
|
+ ktime_t poll_time;
|
|
+ uint16_t flags;
|
|
+ uint16_t type;
|
|
+ const struct gpio_event_direct_entry *keymap;
|
|
+ size_t keymap_size;
|
|
+};
|
|
+
|
|
+/* outputs */
|
|
+extern int gpio_event_output_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func);
|
|
+extern int gpio_event_output_event(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data,
|
|
+ unsigned int type, unsigned int code, int value);
|
|
+struct gpio_event_output_info {
|
|
+ /* initialize to gpio_event_output_func and gpio_event_output_event */
|
|
+ struct gpio_event_info info;
|
|
+ uint16_t flags;
|
|
+ uint16_t type;
|
|
+ const struct gpio_event_direct_entry *keymap;
|
|
+ size_t keymap_size;
|
|
+};
|
|
+
|
|
+
|
|
+/* axes */
|
|
+
|
|
+enum gpio_event_axis_flags {
|
|
+ GPIOEAF_PRINT_UNKNOWN_DIRECTION = 1U << 16,
|
|
+ GPIOEAF_PRINT_RAW = 1U << 17,
|
|
+ GPIOEAF_PRINT_EVENT = 1U << 18,
|
|
+};
|
|
+
|
|
+extern int gpio_event_axis_func(struct input_dev *input_dev,
|
|
+ struct gpio_event_info *info, void **data, int func);
|
|
+struct gpio_event_axis_info {
|
|
+ /* initialize to gpio_event_axis_func */
|
|
+ struct gpio_event_info info;
|
|
+ uint8_t count;
|
|
+ uint8_t type; /* EV_REL or EV_ABS */
|
|
+ uint16_t code;
|
|
+ uint16_t decoded_size;
|
|
+ uint16_t (*map)(struct gpio_event_axis_info *info, uint16_t in);
|
|
+ uint32_t *gpio;
|
|
+ uint32_t flags;
|
|
+};
|
|
+#define gpio_axis_2bit_gray_map gpio_axis_4bit_gray_map
|
|
+#define gpio_axis_3bit_gray_map gpio_axis_4bit_gray_map
|
|
+uint16_t gpio_axis_4bit_gray_map(
|
|
+ struct gpio_event_axis_info *info, uint16_t in);
|
|
+uint16_t gpio_axis_5bit_singletrack_map(
|
|
+ struct gpio_event_axis_info *info, uint16_t in);
|
|
+
|
|
+#endif
|