--- /dev/null
+/*
+ * Copyright (c) 2005 John Lenz
+ *
+ * Based on from xtkbd.c
+ */
+
+/*
+ * LoCoMo keyboard driver for Linux/ARM
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+
+#include <asm/hardware/locomo.h>
+#include <asm/irq.h>
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
+MODULE_DESCRIPTION("LoCoMo keyboard driver");
+MODULE_LICENSE("GPL");
+
+#define LOCOMOKBD_NUMKEYS 128
+
+#define KEY_ACTIVITY KEY_F16
+#define KEY_CONTACT KEY_F18
+#define KEY_CENTER KEY_F15
+
+static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
+ 0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0, /* 0 - 9 */
+ 0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT, /* 10 - 19 */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 29 */
+ 0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0, /* 30 - 39 */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT, /* 40 - 49 */
+ KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T, /* 50 - 59 */
+ KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0, /* 60 - 69 */
+ KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0, /* 70 - 79 */
+ 0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J, /* 80 - 89 */
+ KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0, /* 90 - 99 */
+ 0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A, /* 100 - 109 */
+ KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0, /* 110 - 119 */
+ KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0 /* 120 - 128 */
+};
+
+#define KB_ROWS 16
+#define KB_COLS 8
+#define KB_ROWMASK(r) (1 << (r))
+#define SCANCODE(c,r) ( ((c)<<4) + (r) + 1 )
+#define NR_SCANCODES 128
+
+#define KB_DELAY 8
+#define SCAN_INTERVAL (HZ/10)
+#define LOCOMOKBD_PRESSED 1
+
+struct locomokbd {
+ unsigned char keycode[LOCOMOKBD_NUMKEYS];
+ struct input_dev input;
+ char phys[32];
+
+ struct locomo_dev *ldev;
+ unsigned long base;
+ spinlock_t lock;
+
+ struct timer_list timer;
+};
+
+/* helper functions for reading the keyboard matrix */
+static inline void locomokbd_charge_all(unsigned long membase)
+{
+ locomo_writel(0x00FF, membase + LOCOMO_KSC);
+}
+
+static inline void locomokbd_activate_all(unsigned long membase)
+{
+ unsigned long r;
+
+ locomo_writel(0, membase + LOCOMO_KSC);
+ r = locomo_readl(membase + LOCOMO_KIC);
+ r &= 0xFEFF;
+ locomo_writel(r, membase + LOCOMO_KIC);
+}
+
+static inline void locomokbd_activate_col(unsigned long membase, int col)
+{
+ unsigned short nset;
+ unsigned short nbset;
+
+ nset = 0xFF & ~(1 << col);
+ nbset = (nset << 8) + nset;
+ locomo_writel(nbset, membase + LOCOMO_KSC);
+}
+
+static inline void locomokbd_reset_col(unsigned long membase, int col)
+{
+ unsigned short nbset;
+
+ nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
+ locomo_writel(nbset, membase + LOCOMO_KSC);
+}
+
+/*
+ * The LoCoMo 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 locomokbd_scankeyboard(struct locomokbd *locomokbd, struct pt_regs *regs)
+{
+ unsigned int row, col, rowd, scancode;
+ unsigned long flags;
+ unsigned int num_pressed;
+ unsigned long membase = locomokbd->base;
+
+ spin_lock_irqsave(&locomokbd->lock, flags);
+
+ if (regs)
+ input_regs(&locomokbd->input, regs);
+
+ locomokbd_charge_all(membase);
+
+ num_pressed = 0;
+ for (col = 0; col < KB_COLS; col++) {
+
+ locomokbd_activate_col(membase, col);
+ udelay(KB_DELAY);
+
+ rowd = ~locomo_readl(membase + LOCOMO_KIB);
+ for (row = 0; row < KB_ROWS; row++ ) {
+ scancode = SCANCODE(col, row);
+ if (rowd & KB_ROWMASK(row)) {
+ num_pressed += 1;
+ input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 1);
+ } else {
+ input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 0);
+ }
+ }
+ locomokbd_reset_col(membase, col);
+ }
+ locomokbd_activate_all(membase);
+
+ input_sync(&locomokbd->input);
+
+ /* if any keys are pressed, enable the timer */
+ if (num_pressed)
+ mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
+
+ spin_unlock_irqrestore(&locomokbd->lock, flags);
+}
+
+/*
+ * LoCoMo keyboard interrupt handler.
+ */
+static irqreturn_t locomokbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct locomokbd *locomokbd = dev_id;
+ /** wait chattering delay **/
+ udelay(100);
+
+ locomokbd_scankeyboard(locomokbd, regs);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * LoCoMo timer checking for released keys
+ */
+static void locomokbd_timer_callback(unsigned long data)
+{
+ struct locomokbd *locomokbd = (struct locomokbd *) data;
+ locomokbd_scankeyboard(locomokbd, NULL);
+}
+
+static int locomokbd_probe(struct locomo_dev *dev)
+{
+ struct locomokbd *locomokbd;
+ int i, ret;
+
+ locomokbd = kmalloc(sizeof(struct locomokbd), GFP_KERNEL);
+ if (!locomokbd)
+ return -ENOMEM;
+
+ memset(locomokbd, 0, sizeof(struct locomokbd));
+
+ /* try and claim memory region */
+ if (!request_mem_region((unsigned long) dev->mapbase,
+ dev->length,
+ LOCOMO_DRIVER_NAME(dev))) {
+ ret = -EBUSY;
+ printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
+ goto free;
+ }
+
+ locomokbd->ldev = dev;
+ locomo_set_drvdata(dev, locomokbd);
+
+ locomokbd->base = (unsigned long) dev->mapbase;
+
+ spin_lock_init(&locomokbd->lock);
+
+ init_timer(&locomokbd->timer);
+ locomokbd->timer.function = locomokbd_timer_callback;
+ locomokbd->timer.data = (unsigned long) locomokbd;
+
+ locomokbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
+
+ init_input_dev(&locomokbd->input);
+ locomokbd->input.keycode = locomokbd->keycode;
+ locomokbd->input.keycodesize = sizeof(unsigned char);
+ locomokbd->input.keycodemax = ARRAY_SIZE(locomokbd_keycode);
+ locomokbd->input.private = locomokbd;
+
+ memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
+ for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
+ set_bit(locomokbd->keycode[i], locomokbd->input.keybit);
+ clear_bit(0, locomokbd->input.keybit);
+
+ strcpy(locomokbd->phys, "locomokbd/input0");
+
+ locomokbd->input.name = "LoCoMo keyboard";
+ locomokbd->input.phys = locomokbd->phys;
+ locomokbd->input.id.bustype = BUS_XTKBD;
+ locomokbd->input.id.vendor = 0x0001;
+ locomokbd->input.id.product = 0x0001;
+ locomokbd->input.id.version = 0x0100;
+
+ /* attempt to get the interrupt */
+ ret = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
+ if (ret) {
+ printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
+ goto out;
+ }
+
+ input_register_device(&locomokbd->input);
+
+ printk(KERN_INFO "input: LoCoMo keyboard on locomokbd\n");
+
+ return 0;
+
+out:
+ release_mem_region((unsigned long) dev->mapbase, dev->length);
+ locomo_set_drvdata(dev, NULL);
+free:
+ kfree(locomokbd);
+
+ return ret;
+}
+
+static int locomokbd_remove(struct locomo_dev *dev)
+{
+ struct locomokbd *locomokbd = locomo_get_drvdata(dev);
+
+ free_irq(dev->irq[0], locomokbd);
+
+ del_timer_sync(&locomokbd->timer);
+
+ input_unregister_device(&locomokbd->input);
+ locomo_set_drvdata(dev, NULL);
+
+ release_mem_region((unsigned long) dev->mapbase, dev->length);
+
+ kfree(locomokbd);
+
+ return 0;
+}
+
+static struct locomo_driver keyboard_driver = {
+ .drv = {
+ .name = "locomokbd"
+ },
+ .devid = LOCOMO_DEVID_KEYBOARD,
+ .probe = locomokbd_probe,
+ .remove = locomokbd_remove,
+};
+
+static int __init locomokbd_init(void)
+{
+ return locomo_driver_register(&keyboard_driver);
+}
+
+static void __exit locomokbd_exit(void)
+{
+ locomo_driver_unregister(&keyboard_driver);
+}
+
+module_init(locomokbd_init);
+module_exit(locomokbd_exit);
git://git.onelab.eu / linux-2.6.git / blobdiff