diff options
Diffstat (limited to 'drivers/input/keyboard/locomokbd.c')
| -rw-r--r-- | drivers/input/keyboard/locomokbd.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/drivers/input/keyboard/locomokbd.c b/drivers/input/keyboard/locomokbd.c new file mode 100644 index 0000000..d3e9dd6 --- /dev/null +++ b/drivers/input/keyboard/locomokbd.c @@ -0,0 +1,309 @@ +/* + * 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); |
