--- /dev/null
+/*
+ * Keyboard driver for Sharp Tosa models (SL-6000x)
+ *
+ * Copyright (c) 2005 Dirk Opfer
+ * Copyright (c) 2007 Dmitry Baryshkov
+ *
+ * Based on xtkbd.c/locomkbd.c/corgikbd.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+
+#include <asm/arch/gpio.h>
+#include <asm/arch/tosa.h>
+
+#define KB_ROWMASK(r) (1 << (r))
+#define SCANCODE(r, c) (((r)<<4) + (c) + 1)
+#define NR_SCANCODES SCANCODE(TOSA_KEY_SENSE_NUM - 1, TOSA_KEY_STROBE_NUM - 1) + 1
+
+#define SCAN_INTERVAL (HZ/10)
+
+#define KB_DISCHARGE_DELAY 10
+#define KB_ACTIVATE_DELAY 10
+
+static unsigned int tosakbd_keycode[NR_SCANCODES] = {
+0,
+0, KEY_W, 0, 0, 0, KEY_K, KEY_BACKSPACE, KEY_P,
+0, 0, 0, 0, 0, 0, 0, 0,
+KEY_Q, KEY_E, KEY_T, KEY_Y, 0, KEY_O, KEY_I, KEY_COMMA,
+0, 0, 0, 0, 0, 0, 0, 0,
+KEY_A, KEY_D, KEY_G, KEY_U, 0, KEY_L, KEY_ENTER, KEY_DOT,
+0, 0, 0, 0, 0, 0, 0, 0,
+KEY_Z, KEY_C, KEY_V, KEY_J, TOSA_KEY_ADDRESSBOOK, TOSA_KEY_CANCEL, TOSA_KEY_CENTER, TOSA_KEY_OK,
+KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, 0,
+KEY_S, KEY_R, KEY_B, KEY_N, TOSA_KEY_CALENDAR, TOSA_KEY_HOMEPAGE, KEY_LEFTCTRL, TOSA_KEY_LIGHT,
+0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,
+KEY_TAB, KEY_SLASH, KEY_H, KEY_M, TOSA_KEY_MENU, 0, KEY_UP, 0,
+0, 0, TOSA_KEY_FN, 0, 0, 0, 0, 0,
+KEY_X, KEY_F, KEY_SPACE, KEY_APOSTROPHE, TOSA_KEY_MAIL, KEY_LEFT, KEY_DOWN, KEY_RIGHT,
+0, 0, 0,
+};
+
+struct tosakbd {
+ unsigned int keycode[ARRAY_SIZE(tosakbd_keycode)];
+ struct input_dev *input;
+
+ spinlock_t lock; /* protect kbd scanning */
+ struct timer_list timer;
+};
+
+
+/* Helper functions for reading the keyboard matrix
+ * Note: We should really be using pxa_gpio_mode to alter GPDR but it
+ * requires a function call per GPIO bit which is excessive
+ * when we need to access 12 bits at once, multiple times.
+ * These functions must be called within local_irq_save()/local_irq_restore()
+ * or similar.
+ */
+#define GET_ROWS_STATUS(c) ((GPLR2 & TOSA_GPIO_ALL_SENSE_BIT) >> TOSA_GPIO_ALL_SENSE_RSHIFT)
+
+static inline void tosakbd_discharge_all(void)
+{
+ /* STROBE All HiZ */
+ GPCR1 = TOSA_GPIO_HIGH_STROBE_BIT;
+ GPDR1 &= ~TOSA_GPIO_HIGH_STROBE_BIT;
+ GPCR2 = TOSA_GPIO_LOW_STROBE_BIT;
+ GPDR2 &= ~TOSA_GPIO_LOW_STROBE_BIT;
+}
+
+static inline void tosakbd_activate_all(void)
+{
+ /* STROBE ALL -> High */
+ GPSR1 = TOSA_GPIO_HIGH_STROBE_BIT;
+ GPDR1 |= TOSA_GPIO_HIGH_STROBE_BIT;
+ GPSR2 = TOSA_GPIO_LOW_STROBE_BIT;
+ GPDR2 |= TOSA_GPIO_LOW_STROBE_BIT;
+
+ udelay(KB_DISCHARGE_DELAY);
+
+ /* STATE CLEAR */
+ GEDR2 |= TOSA_GPIO_ALL_SENSE_BIT;
+}
+
+static inline void tosakbd_activate_col(int col)
+{
+ if (col <= 5) {
+ /* STROBE col -> High, not col -> HiZ */
+ GPSR1 = TOSA_GPIO_STROBE_BIT(col);
+ GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
+ } else {
+ /* STROBE col -> High, not col -> HiZ */
+ GPSR2 = TOSA_GPIO_STROBE_BIT(col);
+ GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
+ }
+}
+
+static inline void tosakbd_reset_col(int col)
+{
+ if (col <= 5) {
+ /* STROBE col -> Low */
+ GPCR1 = TOSA_GPIO_STROBE_BIT(col);
+ /* STROBE col -> out, not col -> HiZ */
+ GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
+ } else {
+ /* STROBE col -> Low */
+ GPCR2 = TOSA_GPIO_STROBE_BIT(col);
+ /* STROBE col -> out, not col -> HiZ */
+ GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
+ }
+}
+/*
+ * The tosa keyboard only generates interrupts when a key is pressed.
+ * So when a key is pressed, we enable a timer. This timer scans the
+ * keyboard, and this is how we detect when the key is released.
+ */
+
+/* Scan the hardware keyboard and push any changes up through the input layer */
+static void tosakbd_scankeyboard(struct platform_device *dev)
+{
+ struct tosakbd *tosakbd = platform_get_drvdata(dev);
+ unsigned int row, col, rowd;
+ unsigned long flags;
+ unsigned int num_pressed = 0;
+
+ spin_lock_irqsave(&tosakbd->lock, flags);
+
+ for (col = 0; col < TOSA_KEY_STROBE_NUM; col++) {
+ /*
+ * Discharge the output driver capacitatance
+ * in the keyboard matrix. (Yes it is significant..)
+ */
+ tosakbd_discharge_all();
+ udelay(KB_DISCHARGE_DELAY);
+
+ tosakbd_activate_col(col);
+ udelay(KB_ACTIVATE_DELAY);
+
+ rowd = GET_ROWS_STATUS(col);
+
+ for (row = 0; row < TOSA_KEY_SENSE_NUM; row++) {
+ unsigned int scancode, pressed;
+ scancode = SCANCODE(row, col);
+ pressed = rowd & KB_ROWMASK(row);
+
+ if (pressed && !tosakbd->keycode[scancode])
+ dev_warn(&dev->dev,
+ "unhandled scancode: 0x%02x\n",
+ scancode);
+
+ input_report_key(tosakbd->input,
+ tosakbd->keycode[scancode],
+ pressed);
+ if (pressed)
+ num_pressed++;
+ }
+
+ tosakbd_reset_col(col);
+ }
+
+ tosakbd_activate_all();
+
+ input_sync(tosakbd->input);
+
+ /* if any keys are pressed, enable the timer */
+ if (num_pressed)
+ mod_timer(&tosakbd->timer, jiffies + SCAN_INTERVAL);
+
+ spin_unlock_irqrestore(&tosakbd->lock, flags);
+}
+
+/*
+ * tosa keyboard interrupt handler.
+ */
+static irqreturn_t tosakbd_interrupt(int irq, void *__dev)
+{
+ struct platform_device *dev = __dev;
+ struct tosakbd *tosakbd = platform_get_drvdata(dev);
+
+ if (!timer_pending(&tosakbd->timer)) {
+ /** wait chattering delay **/
+ udelay(20);
+ tosakbd_scankeyboard(dev);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * tosa timer checking for released keys
+ */
+static void tosakbd_timer_callback(unsigned long __dev)
+{
+ struct platform_device *dev = (struct platform_device *)__dev;
+ tosakbd_scankeyboard(dev);
+}
+
+#ifdef CONFIG_PM
+static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct tosakbd *tosakbd = platform_get_drvdata(dev);
+
+ del_timer_sync(&tosakbd->timer);
+
+ return 0;
+}
+
+static int tosakbd_resume(struct platform_device *dev)
+{
+ tosakbd_scankeyboard(dev);
+
+ return 0;
+}
+#else
+#define tosakbd_suspend NULL
+#define tosakbd_resume NULL
+#endif
+
+static int __devinit tosakbd_probe(struct platform_device *pdev) {
+
+ int i;
+ struct tosakbd *tosakbd;
+ struct input_dev *input_dev;
+ int error;
+
+ tosakbd = kzalloc(sizeof(struct tosakbd), GFP_KERNEL);
+ if (!tosakbd)
+ return -ENOMEM;
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ kfree(tosakbd);
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, tosakbd);
+
+ spin_lock_init(&tosakbd->lock);
+
+ /* Init Keyboard rescan timer */
+ init_timer(&tosakbd->timer);
+ tosakbd->timer.function = tosakbd_timer_callback;
+ tosakbd->timer.data = (unsigned long) pdev;
+
+ tosakbd->input = input_dev;
+
+ input_set_drvdata(input_dev, tosakbd);
+ input_dev->name = "Tosa Keyboard";
+ input_dev->phys = "tosakbd/input0";
+ input_dev->dev.parent = &pdev->dev;
+
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->id.vendor = 0x0001;
+ input_dev->id.product = 0x0001;
+ input_dev->id.version = 0x0100;
+
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
+ input_dev->keycode = tosakbd->keycode;
+ input_dev->keycodesize = sizeof(unsigned int);
+ input_dev->keycodemax = ARRAY_SIZE(tosakbd_keycode);
+
+ memcpy(tosakbd->keycode, tosakbd_keycode, sizeof(tosakbd_keycode));
+
+ for (i = 0; i < ARRAY_SIZE(tosakbd_keycode); i++)
+ __set_bit(tosakbd->keycode[i], input_dev->keybit);
+ clear_bit(0, input_dev->keybit);
+
+ /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
+ for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
+ int gpio = TOSA_GPIO_KEY_SENSE(i);
+ int irq;
+ error = gpio_request(gpio, "tosakbd");
+ if (error < 0) {
+ printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
+ " error %d\n", gpio, error);
+ goto fail;
+ }
+
+ error = gpio_direction_input(TOSA_GPIO_KEY_SENSE(i));
+ if (error < 0) {
+ printk(KERN_ERR "tosakbd: failed to configure input"
+ " direction for GPIO %d, error %d\n",
+ gpio, error);
+ gpio_free(gpio);
+ goto fail;
+ }
+
+ irq = gpio_to_irq(gpio);
+ if (irq < 0) {
+ error = irq;
+ printk(KERN_ERR "gpio-keys: Unable to get irq number"
+ " for GPIO %d, error %d\n",
+ gpio, error);
+ gpio_free(gpio);
+ goto fail;
+ }
+
+ error = request_irq(irq, tosakbd_interrupt,
+ IRQF_DISABLED | IRQF_TRIGGER_RISING,
+ "tosakbd", pdev);
+
+ if (error) {
+ printk("tosakbd: Can't get IRQ: %d: error %d!\n",
+ irq, error);
+ gpio_free(gpio);
+ goto fail;
+ }
+ }
+
+ /* Set Strobe lines as outputs - set high */
+ for (i = 0; i < TOSA_KEY_STROBE_NUM; i++) {
+ int gpio = TOSA_GPIO_KEY_STROBE(i);
+ error = gpio_request(gpio, "tosakbd");
+ if (error < 0) {
+ printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
+ " error %d\n", gpio, error);
+ goto fail2;
+ }
+
+ error = gpio_direction_output(gpio, 1);
+ if (error < 0) {
+ printk(KERN_ERR "tosakbd: failed to configure input"
+ " direction for GPIO %d, error %d\n",
+ gpio, error);
+ gpio_free(gpio);
+ goto fail;
+ }
+
+ }
+
+ error = input_register_device(input_dev);
+ if (error) {
+ printk(KERN_ERR "tosakbd: Unable to register input device, "
+ "error: %d\n", error);
+ goto fail;
+ }
+
+ printk(KERN_INFO "input: Tosa Keyboard Registered\n");
+
+ return 0;
+
+fail2:
+ while (--i >= 0)
+ gpio_free(TOSA_GPIO_KEY_STROBE(i));
+
+ i = TOSA_KEY_SENSE_NUM;
+fail:
+ while (--i >= 0) {
+ free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), pdev);
+ gpio_free(TOSA_GPIO_KEY_SENSE(i));
+ }
+
+ platform_set_drvdata(pdev, NULL);
+ input_free_device(input_dev);
+ kfree(tosakbd);
+
+ return error;
+}
+
+static int __devexit tosakbd_remove(struct platform_device *dev) {
+
+ int i;
+ struct tosakbd *tosakbd = platform_get_drvdata(dev);
+
+ for (i = 0; i < TOSA_KEY_STROBE_NUM; i++)
+ gpio_free(TOSA_GPIO_KEY_STROBE(i));
+
+ for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
+ free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), dev);
+ gpio_free(TOSA_GPIO_KEY_SENSE(i));
+ }
+
+ del_timer_sync(&tosakbd->timer);
+
+ input_unregister_device(tosakbd->input);
+
+ kfree(tosakbd);
+
+ return 0;
+}
+
+static struct platform_driver tosakbd_driver = {
+ .probe = tosakbd_probe,
+ .remove = __devexit_p(tosakbd_remove),
+ .suspend = tosakbd_suspend,
+ .resume = tosakbd_resume,
+ .driver = {
+ .name = "tosa-keyboard",
+ },
+};
+
+static int __devinit tosakbd_init(void)
+{
+ return platform_driver_register(&tosakbd_driver);
+}
+
+static void __exit tosakbd_exit(void)
+{
+ platform_driver_unregister(&tosakbd_driver);
+}
+
+module_init(tosakbd_init);
+module_exit(tosakbd_exit);
+
+MODULE_AUTHOR("Dirk Opfer <Dirk@Opfer-Online.de>");
+MODULE_DESCRIPTION("Tosa Keyboard Driver");
+MODULE_LICENSE("GPL v2");
projects / linux-2.6 / commitdiff