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343 lines
8.7 KiB
343 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* LoCoMo keyboard driver for Linux-based ARM PDAs: |
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* - SHARP Zaurus Collie (SL-5500) |
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* - SHARP Zaurus Poodle (SL-5600) |
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* |
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* Copyright (c) 2005 John Lenz |
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* Based on from xtkbd.c |
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*/ |
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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 <[email protected]>"); |
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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 const unsigned char |
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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 KB_DELAY 8 |
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#define SCAN_INTERVAL (HZ/10) |
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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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unsigned long base; |
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spinlock_t lock; |
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struct timer_list timer; |
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unsigned long suspend_jiffies; |
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unsigned int count_cancel; |
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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) |
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{ |
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unsigned int row, col, rowd; |
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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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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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unsigned int scancode, pressed, key; |
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scancode = SCANCODE(col, row); |
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pressed = rowd & KB_ROWMASK(row); |
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key = locomokbd->keycode[scancode]; |
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input_report_key(locomokbd->input, key, pressed); |
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if (likely(!pressed)) |
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continue; |
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num_pressed++; |
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/* The "Cancel/ESC" key is labeled "On/Off" on |
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* Collie and Poodle and should suspend the device |
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* if it was pressed for more than a second. */ |
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if (unlikely(key == KEY_ESC)) { |
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if (!time_after(jiffies, |
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locomokbd->suspend_jiffies + HZ)) |
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continue; |
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if (locomokbd->count_cancel++ |
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!= (HZ/SCAN_INTERVAL + 1)) |
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continue; |
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input_event(locomokbd->input, EV_PWR, |
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KEY_SUSPEND, 1); |
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locomokbd->suspend_jiffies = jiffies; |
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} else |
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locomokbd->count_cancel = 0; |
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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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else |
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locomokbd->count_cancel = 0; |
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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) |
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{ |
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struct locomokbd *locomokbd = dev_id; |
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u16 r; |
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r = locomo_readl(locomokbd->base + LOCOMO_KIC); |
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if ((r & 0x0001) == 0) |
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return IRQ_HANDLED; |
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locomo_writel(r & ~0x0100, locomokbd->base + LOCOMO_KIC); /* Ack */ |
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/** wait chattering delay **/ |
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udelay(100); |
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locomokbd_scankeyboard(locomokbd); |
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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(struct timer_list *t) |
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{ |
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struct locomokbd *locomokbd = from_timer(locomokbd, t, timer); |
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locomokbd_scankeyboard(locomokbd); |
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} |
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static int locomokbd_open(struct input_dev *dev) |
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{ |
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struct locomokbd *locomokbd = input_get_drvdata(dev); |
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u16 r; |
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r = locomo_readl(locomokbd->base + LOCOMO_KIC) | 0x0010; |
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locomo_writel(r, locomokbd->base + LOCOMO_KIC); |
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return 0; |
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} |
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static void locomokbd_close(struct input_dev *dev) |
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{ |
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struct locomokbd *locomokbd = input_get_drvdata(dev); |
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u16 r; |
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r = locomo_readl(locomokbd->base + LOCOMO_KIC) & ~0x0010; |
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locomo_writel(r, locomokbd->base + LOCOMO_KIC); |
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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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struct input_dev *input_dev; |
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int i, err; |
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locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!locomokbd || !input_dev) { |
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err = -ENOMEM; |
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goto err_free_mem; |
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} |
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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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err = -EBUSY; |
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printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n"); |
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goto err_free_mem; |
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} |
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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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timer_setup(&locomokbd->timer, locomokbd_timer_callback, 0); |
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locomokbd->suspend_jiffies = jiffies; |
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locomokbd->input = input_dev; |
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strcpy(locomokbd->phys, "locomokbd/input0"); |
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input_dev->name = "LoCoMo keyboard"; |
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input_dev->phys = locomokbd->phys; |
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input_dev->id.bustype = BUS_HOST; |
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input_dev->id.vendor = 0x0001; |
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input_dev->id.product = 0x0001; |
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input_dev->id.version = 0x0100; |
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input_dev->open = locomokbd_open; |
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input_dev->close = locomokbd_close; |
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input_dev->dev.parent = &dev->dev; |
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | |
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BIT_MASK(EV_PWR); |
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input_dev->keycode = locomokbd->keycode; |
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input_dev->keycodesize = sizeof(locomokbd_keycode[0]); |
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input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode); |
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input_set_drvdata(input_dev, 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], input_dev->keybit); |
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clear_bit(0, input_dev->keybit); |
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/* attempt to get the interrupt */ |
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err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd); |
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if (err) { |
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printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n"); |
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goto err_release_region; |
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} |
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err = input_register_device(locomokbd->input); |
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if (err) |
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goto err_free_irq; |
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return 0; |
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err_free_irq: |
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free_irq(dev->irq[0], locomokbd); |
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err_release_region: |
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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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err_free_mem: |
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input_free_device(input_dev); |
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kfree(locomokbd); |
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return err; |
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} |
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static void 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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} |
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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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