diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/input/keyboard/locomokbd.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/input/keyboard/locomokbd.c b/drivers/input/keyboard/locomokbd.c new file mode 100644 index 000000000..dae053596 --- /dev/null +++ b/drivers/input/keyboard/locomokbd.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LoCoMo keyboard driver for Linux-based ARM PDAs: + * - SHARP Zaurus Collie (SL-5500) + * - SHARP Zaurus Poodle (SL-5600) + * + * Copyright (c) 2005 John Lenz + * Based on from xtkbd.c + */ + +#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 const 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 KB_DELAY 8 +#define SCAN_INTERVAL (HZ/10) + +struct locomokbd { + unsigned char keycode[LOCOMOKBD_NUMKEYS]; + struct input_dev *input; + char phys[32]; + + unsigned long base; + spinlock_t lock; + + struct timer_list timer; + unsigned long suspend_jiffies; + unsigned int count_cancel; +}; + +/* 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) +{ + unsigned int row, col, rowd; + unsigned long flags; + unsigned int num_pressed; + unsigned long membase = locomokbd->base; + + spin_lock_irqsave(&locomokbd->lock, flags); + + 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++) { + unsigned int scancode, pressed, key; + + scancode = SCANCODE(col, row); + pressed = rowd & KB_ROWMASK(row); + key = locomokbd->keycode[scancode]; + + input_report_key(locomokbd->input, key, pressed); + if (likely(!pressed)) + continue; + + num_pressed++; + + /* The "Cancel/ESC" key is labeled "On/Off" on + * Collie and Poodle and should suspend the device + * if it was pressed for more than a second. */ + if (unlikely(key == KEY_ESC)) { + if (!time_after(jiffies, + locomokbd->suspend_jiffies + HZ)) + continue; + if (locomokbd->count_cancel++ + != (HZ/SCAN_INTERVAL + 1)) + continue; + input_event(locomokbd->input, EV_PWR, + KEY_SUSPEND, 1); + locomokbd->suspend_jiffies = jiffies; + } else + locomokbd->count_cancel = 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); + else + locomokbd->count_cancel = 0; + + spin_unlock_irqrestore(&locomokbd->lock, flags); +} + +/* + * LoCoMo keyboard interrupt handler. + */ +static irqreturn_t locomokbd_interrupt(int irq, void *dev_id) +{ + struct locomokbd *locomokbd = dev_id; + u16 r; + + r = locomo_readl(locomokbd->base + LOCOMO_KIC); + if ((r & 0x0001) == 0) + return IRQ_HANDLED; + + locomo_writel(r & ~0x0100, locomokbd->base + LOCOMO_KIC); /* Ack */ + + /** wait chattering delay **/ + udelay(100); + + locomokbd_scankeyboard(locomokbd); + return IRQ_HANDLED; +} + +/* + * LoCoMo timer checking for released keys + */ +static void locomokbd_timer_callback(struct timer_list *t) +{ + struct locomokbd *locomokbd = from_timer(locomokbd, t, timer); + + locomokbd_scankeyboard(locomokbd); +} + +static int locomokbd_open(struct input_dev *dev) +{ + struct locomokbd *locomokbd = input_get_drvdata(dev); + u16 r; + + r = locomo_readl(locomokbd->base + LOCOMO_KIC) | 0x0010; + locomo_writel(r, locomokbd->base + LOCOMO_KIC); + return 0; +} + +static void locomokbd_close(struct input_dev *dev) +{ + struct locomokbd *locomokbd = input_get_drvdata(dev); + u16 r; + + r = locomo_readl(locomokbd->base + LOCOMO_KIC) & ~0x0010; + locomo_writel(r, locomokbd->base + LOCOMO_KIC); +} + +static int locomokbd_probe(struct locomo_dev *dev) +{ + struct locomokbd *locomokbd; + struct input_dev *input_dev; + int i, err; + + locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!locomokbd || !input_dev) { + err = -ENOMEM; + goto err_free_mem; + } + + /* try and claim memory region */ + if (!request_mem_region((unsigned long) dev->mapbase, + dev->length, + LOCOMO_DRIVER_NAME(dev))) { + err = -EBUSY; + printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n"); + goto err_free_mem; + } + + locomo_set_drvdata(dev, locomokbd); + + locomokbd->base = (unsigned long) dev->mapbase; + + spin_lock_init(&locomokbd->lock); + + timer_setup(&locomokbd->timer, locomokbd_timer_callback, 0); + + locomokbd->suspend_jiffies = jiffies; + + locomokbd->input = input_dev; + strcpy(locomokbd->phys, "locomokbd/input0"); + + input_dev->name = "LoCoMo keyboard"; + input_dev->phys = locomokbd->phys; + input_dev->id.bustype = BUS_HOST; + input_dev->id.vendor = 0x0001; + input_dev->id.product = 0x0001; + input_dev->id.version = 0x0100; + input_dev->open = locomokbd_open; + input_dev->close = locomokbd_close; + input_dev->dev.parent = &dev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | + BIT_MASK(EV_PWR); + input_dev->keycode = locomokbd->keycode; + input_dev->keycodesize = sizeof(locomokbd_keycode[0]); + input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode); + + input_set_drvdata(input_dev, locomokbd); + + memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode)); + for (i = 0; i < LOCOMOKBD_NUMKEYS; i++) + set_bit(locomokbd->keycode[i], input_dev->keybit); + clear_bit(0, input_dev->keybit); + + /* attempt to get the interrupt */ + err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd); + if (err) { + printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n"); + goto err_release_region; + } + + err = input_register_device(locomokbd->input); + if (err) + goto err_free_irq; + + return 0; + + err_free_irq: + free_irq(dev->irq[0], locomokbd); + err_release_region: + release_mem_region((unsigned long) dev->mapbase, dev->length); + locomo_set_drvdata(dev, NULL); + err_free_mem: + input_free_device(input_dev); + kfree(locomokbd); + + return err; +} + +static void 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); +} + +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); |