1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
310 lines
8.1 KiB
C
310 lines
8.1 KiB
C
/*
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* Copyright (c) 2005 John Lenz
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*
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* Based on from xtkbd.c
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*/
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/*
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* LoCoMo keyboard driver for Linux/ARM
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <asm/hardware/locomo.h>
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#include <asm/irq.h>
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MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
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MODULE_DESCRIPTION("LoCoMo keyboard driver");
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MODULE_LICENSE("GPL");
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#define LOCOMOKBD_NUMKEYS 128
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#define KEY_ACTIVITY KEY_F16
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#define KEY_CONTACT KEY_F18
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#define KEY_CENTER KEY_F15
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static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
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0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0, /* 0 - 9 */
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0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT, /* 10 - 19 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 29 */
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0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0, /* 30 - 39 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT, /* 40 - 49 */
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KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T, /* 50 - 59 */
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KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0, /* 60 - 69 */
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KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0, /* 70 - 79 */
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0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J, /* 80 - 89 */
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KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0, /* 90 - 99 */
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0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A, /* 100 - 109 */
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KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0, /* 110 - 119 */
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KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0 /* 120 - 128 */
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};
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#define KB_ROWS 16
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#define KB_COLS 8
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#define KB_ROWMASK(r) (1 << (r))
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#define SCANCODE(c,r) ( ((c)<<4) + (r) + 1 )
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#define NR_SCANCODES 128
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#define KB_DELAY 8
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#define SCAN_INTERVAL (HZ/10)
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#define LOCOMOKBD_PRESSED 1
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struct locomokbd {
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unsigned char keycode[LOCOMOKBD_NUMKEYS];
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struct input_dev input;
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char phys[32];
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struct locomo_dev *ldev;
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unsigned long base;
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spinlock_t lock;
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struct timer_list timer;
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};
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/* helper functions for reading the keyboard matrix */
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static inline void locomokbd_charge_all(unsigned long membase)
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{
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locomo_writel(0x00FF, membase + LOCOMO_KSC);
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}
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static inline void locomokbd_activate_all(unsigned long membase)
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{
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unsigned long r;
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locomo_writel(0, membase + LOCOMO_KSC);
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r = locomo_readl(membase + LOCOMO_KIC);
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r &= 0xFEFF;
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locomo_writel(r, membase + LOCOMO_KIC);
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}
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static inline void locomokbd_activate_col(unsigned long membase, int col)
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{
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unsigned short nset;
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unsigned short nbset;
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nset = 0xFF & ~(1 << col);
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nbset = (nset << 8) + nset;
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locomo_writel(nbset, membase + LOCOMO_KSC);
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}
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static inline void locomokbd_reset_col(unsigned long membase, int col)
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{
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unsigned short nbset;
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nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
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locomo_writel(nbset, membase + LOCOMO_KSC);
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}
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/*
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* The LoCoMo keyboard only generates interrupts when a key is pressed.
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* So when a key is pressed, we enable a timer. This timer scans the
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* keyboard, and this is how we detect when the key is released.
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*/
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/* Scan the hardware keyboard and push any changes up through the input layer */
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static void locomokbd_scankeyboard(struct locomokbd *locomokbd, struct pt_regs *regs)
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{
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unsigned int row, col, rowd, scancode;
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unsigned long flags;
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unsigned int num_pressed;
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unsigned long membase = locomokbd->base;
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spin_lock_irqsave(&locomokbd->lock, flags);
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if (regs)
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input_regs(&locomokbd->input, regs);
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locomokbd_charge_all(membase);
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num_pressed = 0;
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for (col = 0; col < KB_COLS; col++) {
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locomokbd_activate_col(membase, col);
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udelay(KB_DELAY);
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rowd = ~locomo_readl(membase + LOCOMO_KIB);
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for (row = 0; row < KB_ROWS; row++ ) {
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scancode = SCANCODE(col, row);
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if (rowd & KB_ROWMASK(row)) {
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num_pressed += 1;
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input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 1);
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} else {
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input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 0);
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}
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}
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locomokbd_reset_col(membase, col);
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}
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locomokbd_activate_all(membase);
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input_sync(&locomokbd->input);
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/* if any keys are pressed, enable the timer */
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if (num_pressed)
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mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
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spin_unlock_irqrestore(&locomokbd->lock, flags);
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}
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/*
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* LoCoMo keyboard interrupt handler.
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*/
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static irqreturn_t locomokbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct locomokbd *locomokbd = dev_id;
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/** wait chattering delay **/
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udelay(100);
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locomokbd_scankeyboard(locomokbd, regs);
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return IRQ_HANDLED;
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}
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/*
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* LoCoMo timer checking for released keys
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*/
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static void locomokbd_timer_callback(unsigned long data)
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{
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struct locomokbd *locomokbd = (struct locomokbd *) data;
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locomokbd_scankeyboard(locomokbd, NULL);
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}
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static int locomokbd_probe(struct locomo_dev *dev)
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{
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struct locomokbd *locomokbd;
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int i, ret;
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locomokbd = kmalloc(sizeof(struct locomokbd), GFP_KERNEL);
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if (!locomokbd)
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return -ENOMEM;
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memset(locomokbd, 0, sizeof(struct locomokbd));
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/* try and claim memory region */
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if (!request_mem_region((unsigned long) dev->mapbase,
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dev->length,
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LOCOMO_DRIVER_NAME(dev))) {
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ret = -EBUSY;
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printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
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goto free;
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}
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locomokbd->ldev = dev;
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locomo_set_drvdata(dev, locomokbd);
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locomokbd->base = (unsigned long) dev->mapbase;
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spin_lock_init(&locomokbd->lock);
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init_timer(&locomokbd->timer);
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locomokbd->timer.function = locomokbd_timer_callback;
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locomokbd->timer.data = (unsigned long) locomokbd;
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locomokbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
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init_input_dev(&locomokbd->input);
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locomokbd->input.keycode = locomokbd->keycode;
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locomokbd->input.keycodesize = sizeof(unsigned char);
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locomokbd->input.keycodemax = ARRAY_SIZE(locomokbd_keycode);
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locomokbd->input.private = locomokbd;
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memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
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for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
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set_bit(locomokbd->keycode[i], locomokbd->input.keybit);
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clear_bit(0, locomokbd->input.keybit);
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strcpy(locomokbd->phys, "locomokbd/input0");
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locomokbd->input.name = "LoCoMo keyboard";
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locomokbd->input.phys = locomokbd->phys;
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locomokbd->input.id.bustype = BUS_XTKBD;
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locomokbd->input.id.vendor = 0x0001;
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locomokbd->input.id.product = 0x0001;
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locomokbd->input.id.version = 0x0100;
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/* attempt to get the interrupt */
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ret = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
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if (ret) {
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printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
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goto out;
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}
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input_register_device(&locomokbd->input);
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printk(KERN_INFO "input: LoCoMo keyboard on locomokbd\n");
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return 0;
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out:
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release_mem_region((unsigned long) dev->mapbase, dev->length);
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locomo_set_drvdata(dev, NULL);
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free:
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kfree(locomokbd);
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return ret;
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}
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static int locomokbd_remove(struct locomo_dev *dev)
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{
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struct locomokbd *locomokbd = locomo_get_drvdata(dev);
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free_irq(dev->irq[0], locomokbd);
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del_timer_sync(&locomokbd->timer);
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input_unregister_device(&locomokbd->input);
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locomo_set_drvdata(dev, NULL);
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release_mem_region((unsigned long) dev->mapbase, dev->length);
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kfree(locomokbd);
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return 0;
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}
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static struct locomo_driver keyboard_driver = {
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.drv = {
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.name = "locomokbd"
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},
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.devid = LOCOMO_DEVID_KEYBOARD,
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.probe = locomokbd_probe,
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.remove = locomokbd_remove,
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};
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static int __init locomokbd_init(void)
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{
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return locomo_driver_register(&keyboard_driver);
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}
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static void __exit locomokbd_exit(void)
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{
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locomo_driver_unregister(&keyboard_driver);
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}
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module_init(locomokbd_init);
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module_exit(locomokbd_exit);
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