--- /dev/null
+/*
+ * Keyboard driver for Sharp Corgi models (SL-C7xx)
+ *
+ * Copyright (c) 2004-2005 Richard Purdie
+ *
+ * Based on xtkbd.c/locomkbd.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/irq.h>
+
+#include <asm/arch/corgi.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/hardware/scoop.h>
+
+#define KB_ROWS 8
+#define KB_COLS 12
+#define KB_ROWMASK(r) (1 << (r))
+#define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
+/* zero code, 124 scancodes + 3 hinge combinations */
+#define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )
+#define SCAN_INTERVAL (HZ/10)
+#define CORGIKBD_PRESSED 1
+
+#define HINGE_SCAN_INTERVAL (HZ/4)
+
+#define CORGI_KEY_CALENDER KEY_F1
+#define CORGI_KEY_ADDRESS KEY_F2
+#define CORGI_KEY_FN KEY_F3
+#define CORGI_KEY_OFF KEY_SUSPEND
+#define CORGI_KEY_EXOK KEY_F5
+#define CORGI_KEY_EXCANCEL KEY_F6
+#define CORGI_KEY_EXJOGDOWN KEY_F7
+#define CORGI_KEY_EXJOGUP KEY_F8
+#define CORGI_KEY_JAP1 KEY_LEFTCTRL
+#define CORGI_KEY_JAP2 KEY_LEFTALT
+#define CORGI_KEY_OK KEY_F11
+#define CORGI_KEY_MENU KEY_F12
+#define CORGI_HINGE_0 KEY_KP0
+#define CORGI_HINGE_1 KEY_KP1
+#define CORGI_HINGE_2 KEY_KP2
+
+static unsigned char corgikbd_keycode[NR_SCANCODES] = {
+ 0, /* 0 */
+ 0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, /* 1-16 */
+ 0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0, /* 17-32 */
+ KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0, /* 33-48 */
+ CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0, /* 49-64 */
+ CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, /* 65-80 */
+ KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0, /* 81-96 */
+ KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0, /* 97-112 */
+ CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
+ CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2 /* 125-127 */
+};
+
+
+struct corgikbd {
+ unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
+ struct input_dev input;
+ char phys[32];
+
+ unsigned char state[ARRAY_SIZE(corgikbd_keycode)];
+ spinlock_t lock;
+
+ struct timer_list timer;
+ struct timer_list htimer;
+};
+
+static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data)
+{
+ if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {
+ corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;
+ input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);
+ if (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
+ input_event(&corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
+ } else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {
+ corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;
+ input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);
+ }
+}
+
+#define KB_DISCHARGE_DELAY 10
+#define KB_ACTIVATE_DELAY 10
+
+/* Helper functions for reading the keyboard matrix
+ * Note: We should really be using pxa_gpio_mode to alter GPDR but it
+ * requires a function call per GPIO bit which is excessive
+ * when we need to access 12 bits at once multiple times.
+ * These functions must be called within local_irq_save()/local_irq_restore()
+ * or similar.
+ */
+static inline void corgikbd_discharge_all(void)
+{
+ // STROBE All HiZ
+ GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
+ GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
+}
+
+static inline void corgikbd_activate_all(void)
+{
+ // STROBE ALL -> High
+ GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
+ GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
+
+ udelay(KB_DISCHARGE_DELAY);
+
+ // Clear any interrupts we may have triggered when altering the GPIO lines
+ GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
+ GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
+}
+
+static inline void corgikbd_activate_col(int col)
+{
+ // STROBE col -> High, not col -> HiZ
+ GPSR2 = CORGI_GPIO_STROBE_BIT(col);
+ GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
+}
+
+static inline void corgikbd_reset_col(int col)
+{
+ // STROBE col -> Low
+ GPCR2 = CORGI_GPIO_STROBE_BIT(col);
+ // STROBE col -> out, not col -> HiZ
+ GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
+}
+
+#define GET_ROWS_STATUS(c) (((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))
+
+/*
+ * The corgi keyboard only generates interrupts when a key is pressed.
+ * When a key is pressed, we enable a timer which then scans the
+ * keyboard to detect when the key is released.
+ */
+
+/* Scan the hardware keyboard and push any changes up through the input layer */
+static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
+{
+ unsigned int row, col, rowd, scancode;
+ unsigned long flags;
+ unsigned int num_pressed;
+
+ spin_lock_irqsave(&corgikbd_data->lock, flags);
+
+ if (regs)
+ input_regs(&corgikbd_data->input, regs);
+
+ num_pressed = 0;
+ for (col = 0; col < KB_COLS; col++) {
+ /*
+ * Discharge the output driver capacitatance
+ * in the keyboard matrix. (Yes it is significant..)
+ */
+
+ corgikbd_discharge_all();
+ udelay(KB_DISCHARGE_DELAY);
+
+ corgikbd_activate_col(col);
+ udelay(KB_ACTIVATE_DELAY);
+
+ rowd = GET_ROWS_STATUS(col);
+ for (row = 0; row < KB_ROWS; row++) {
+ scancode = SCANCODE(row, col);
+ handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);
+ if (rowd & KB_ROWMASK(row))
+ num_pressed++;
+ }
+ corgikbd_reset_col(col);
+ }
+
+ corgikbd_activate_all();
+
+ input_sync(&corgikbd_data->input);
+
+ /* if any keys are pressed, enable the timer */
+ if (num_pressed)
+ mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
+
+ spin_unlock_irqrestore(&corgikbd_data->lock, flags);
+}
+
+/*
+ * corgi keyboard interrupt handler.
+ */
+static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct corgikbd *corgikbd_data = dev_id;
+
+ if (!timer_pending(&corgikbd_data->timer)) {
+ /** wait chattering delay **/
+ udelay(20);
+ corgikbd_scankeyboard(corgikbd_data, regs);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * corgi timer checking for released keys
+ */
+static void corgikbd_timer_callback(unsigned long data)
+{
+ struct corgikbd *corgikbd_data = (struct corgikbd *) data;
+ corgikbd_scankeyboard(corgikbd_data, NULL);
+}
+
+/*
+ * The hinge switches generate no interrupt so they need to be
+ * monitored by a timer.
+ *
+ * When we detect changes, we debounce it and then pass the three
+ * positions the system can take as keypresses to the input system.
+ */
+
+#define HINGE_STABLE_COUNT 2
+static int sharpsl_hinge_state;
+static int hinge_count;
+
+static void corgikbd_hinge_timer(unsigned long data)
+{
+ struct corgikbd *corgikbd_data = (struct corgikbd *) data;
+ unsigned long gprr;
+ unsigned long flags;
+
+ gprr = read_scoop_reg(SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
+ if (gprr != sharpsl_hinge_state) {
+ hinge_count = 0;
+ sharpsl_hinge_state = gprr;
+ } else if (hinge_count < HINGE_STABLE_COUNT) {
+ hinge_count++;
+ if (hinge_count >= HINGE_STABLE_COUNT) {
+ spin_lock_irqsave(&corgikbd_data->lock, flags);
+
+ handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */
+ handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */
+ handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed */
+ input_sync(&corgikbd_data->input);
+
+ spin_unlock_irqrestore(&corgikbd_data->lock, flags);
+ }
+ }
+ mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
+}
+
+static int __init corgikbd_probe(struct device *dev)
+{
+ int i;
+ struct corgikbd *corgikbd;
+
+ corgikbd = kcalloc(1, sizeof(struct corgikbd), GFP_KERNEL);
+ if (!corgikbd)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev,corgikbd);
+ strcpy(corgikbd->phys, "corgikbd/input0");
+
+ spin_lock_init(corgikbd->lock);
+
+ /* Init Keyboard rescan timer */
+ init_timer(&corgikbd->timer);
+ corgikbd->timer.function = corgikbd_timer_callback;
+ corgikbd->timer.data = (unsigned long) corgikbd;
+
+ /* Init Hinge Timer */
+ init_timer(&corgikbd->htimer);
+ corgikbd->htimer.function = corgikbd_hinge_timer;
+ corgikbd->htimer.data = (unsigned long) corgikbd;
+
+ init_input_dev(&corgikbd->input);
+ corgikbd->input.private = corgikbd;
+ corgikbd->input.name = "Corgi Keyboard";
+ corgikbd->input.dev = dev;
+ corgikbd->input.phys = corgikbd->phys;
+ corgikbd->input.id.bustype = BUS_HOST;
+ corgikbd->input.id.vendor = 0x0001;
+ corgikbd->input.id.product = 0x0001;
+ corgikbd->input.id.version = 0x0100;
+ corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);
+ corgikbd->input.keycode = corgikbd->keycode;
+ corgikbd->input.keycodesize = sizeof(unsigned char);
+ corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);
+
+ memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
+ for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
+ set_bit(corgikbd->keycode[i], corgikbd->input.keybit);
+ clear_bit(0, corgikbd->input.keybit);
+
+ input_register_device(&corgikbd->input);
+ mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);
+
+ /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
+ for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
+ pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
+ if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
+ SA_INTERRUPT, "corgikbd", corgikbd))
+ printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
+ else
+ set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);
+ }
+
+ /* Set Strobe lines as outputs - set high */
+ for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
+ pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
+
+ printk(KERN_INFO "input: Corgi Keyboard Registered\n");
+
+ return 0;
+}
+
+static int corgikbd_remove(struct device *dev)
+{
+ int i;
+ struct corgikbd *corgikbd = dev_get_drvdata(dev);
+
+ for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
+ free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
+
+ del_timer_sync(&corgikbd->htimer);
+ del_timer_sync(&corgikbd->timer);
+
+ input_unregister_device(&corgikbd->input);
+
+ kfree(corgikbd);
+
+ return 0;
+}
+
+static struct device_driver corgikbd_driver = {
+ .name = "corgi-keyboard",
+ .bus = &platform_bus_type,
+ .probe = corgikbd_probe,
+ .remove = corgikbd_remove,
+};
+
+static int __devinit corgikbd_init(void)
+{
+ return driver_register(&corgikbd_driver);
+}
+
+static void __exit corgikbd_exit(void)
+{
+ driver_unregister(&corgikbd_driver);
+}
+
+module_init(corgikbd_init);
+module_exit(corgikbd_exit);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
+MODULE_DESCRIPTION("Corgi Keyboard Driver");
+MODULE_LICENSE("GPLv2");
git://git.onelab.eu / linux-2.6.git / blobdiff