+++ /dev/null
-/* 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/slab.h>
-#include <linux/gpio.h>
-#include <linux/gpio_event.h>
-#include <linux/hrtimer.h>
-#include <linux/interrupt.h>
-
-struct gpio_kp {
- struct input_dev *input_dev;
- struct gpio_event_matrix_info *keypad_info;
- struct hrtimer timer;
- 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]));
- 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]);
- }
- 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;
- 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");
-
- 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);
- 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;
-}
projects / mv-sheeva.git / blobdiff