diff options
Diffstat (limited to 'target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch')
| -rw-r--r-- | target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch | 1460 |
1 files changed, 1460 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch b/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch new file mode 100644 index 0000000000..1025633802 --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch @@ -0,0 +1,1460 @@ +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 |