2 * Keyboard driver for Sharp Corgi models (SL-C7xx)
4 * Copyright (c) 2004-2005 Richard Purdie
6 * Based on xtkbd.c/locomkbd.c
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/delay.h>
15 #include <linux/platform_device.h>
16 #include <linux/init.h>
17 #include <linux/input.h>
18 #include <linux/interrupt.h>
19 #include <linux/jiffies.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
24 #include <asm/arch/corgi.h>
25 #include <asm/arch/hardware.h>
26 #include <asm/arch/pxa-regs.h>
27 #include <asm/hardware/scoop.h>
31 #define KB_ROWMASK(r) (1 << (r))
32 #define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
33 /* zero code, 124 scancodes + 3 hinge combinations */
34 #define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )
35 #define SCAN_INTERVAL (HZ/10)
37 #define HINGE_SCAN_INTERVAL (HZ/4)
39 #define CORGI_KEY_CALENDER KEY_F1
40 #define CORGI_KEY_ADDRESS KEY_F2
41 #define CORGI_KEY_FN KEY_F3
42 #define CORGI_KEY_CANCEL KEY_F4
43 #define CORGI_KEY_OFF KEY_SUSPEND
44 #define CORGI_KEY_EXOK KEY_F5
45 #define CORGI_KEY_EXCANCEL KEY_F6
46 #define CORGI_KEY_EXJOGDOWN KEY_F7
47 #define CORGI_KEY_EXJOGUP KEY_F8
48 #define CORGI_KEY_JAP1 KEY_LEFTCTRL
49 #define CORGI_KEY_JAP2 KEY_LEFTALT
50 #define CORGI_KEY_MAIL KEY_F10
51 #define CORGI_KEY_OK KEY_F11
52 #define CORGI_KEY_MENU KEY_F12
53 #define CORGI_HINGE_0 KEY_KP0
54 #define CORGI_HINGE_1 KEY_KP1
55 #define CORGI_HINGE_2 KEY_KP2
57 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
59 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 */
60 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 */
61 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 */
62 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 */
63 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 */
64 CORGI_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 */
65 KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0, /* 97-112 */
66 CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
67 CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2 /* 125-127 */
72 unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
73 struct input_dev *input;
76 struct timer_list timer;
77 struct timer_list htimer;
79 unsigned int suspended;
80 unsigned long suspend_jiffies;
83 #define KB_DISCHARGE_DELAY 10
84 #define KB_ACTIVATE_DELAY 10
86 /* Helper functions for reading the keyboard matrix
87 * Note: We should really be using pxa_gpio_mode to alter GPDR but it
88 * requires a function call per GPIO bit which is excessive
89 * when we need to access 12 bits at once multiple times.
90 * These functions must be called within local_irq_save()/local_irq_restore()
93 static inline void corgikbd_discharge_all(void)
96 GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
97 GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
100 static inline void corgikbd_activate_all(void)
102 /* STROBE ALL -> High */
103 GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
104 GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
106 udelay(KB_DISCHARGE_DELAY);
108 /* Clear any interrupts we may have triggered when altering the GPIO lines */
109 GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
110 GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
113 static inline void corgikbd_activate_col(int col)
115 /* STROBE col -> High, not col -> HiZ */
116 GPSR2 = CORGI_GPIO_STROBE_BIT(col);
117 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
120 static inline void corgikbd_reset_col(int col)
122 /* STROBE col -> Low */
123 GPCR2 = CORGI_GPIO_STROBE_BIT(col);
124 /* STROBE col -> out, not col -> HiZ */
125 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
128 #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))
131 * The corgi keyboard only generates interrupts when a key is pressed.
132 * When a key is pressed, we enable a timer which then scans the
133 * keyboard to detect when the key is released.
136 /* Scan the hardware keyboard and push any changes up through the input layer */
137 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
139 unsigned int row, col, rowd;
141 unsigned int num_pressed;
143 if (corgikbd_data->suspended)
146 spin_lock_irqsave(&corgikbd_data->lock, flags);
149 input_regs(corgikbd_data->input, regs);
152 for (col = 0; col < KB_COLS; col++) {
154 * Discharge the output driver capacitatance
155 * in the keyboard matrix. (Yes it is significant..)
158 corgikbd_discharge_all();
159 udelay(KB_DISCHARGE_DELAY);
161 corgikbd_activate_col(col);
162 udelay(KB_ACTIVATE_DELAY);
164 rowd = GET_ROWS_STATUS(col);
165 for (row = 0; row < KB_ROWS; row++) {
166 unsigned int scancode, pressed;
168 scancode = SCANCODE(row, col);
169 pressed = rowd & KB_ROWMASK(row);
171 input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
176 if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
177 && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
178 input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
179 corgikbd_data->suspend_jiffies=jiffies;
182 corgikbd_reset_col(col);
185 corgikbd_activate_all();
187 input_sync(corgikbd_data->input);
189 /* if any keys are pressed, enable the timer */
191 mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
193 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
197 * corgi keyboard interrupt handler.
199 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
201 struct corgikbd *corgikbd_data = dev_id;
203 if (!timer_pending(&corgikbd_data->timer)) {
204 /** wait chattering delay **/
206 corgikbd_scankeyboard(corgikbd_data, regs);
213 * corgi timer checking for released keys
215 static void corgikbd_timer_callback(unsigned long data)
217 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
218 corgikbd_scankeyboard(corgikbd_data, NULL);
222 * The hinge switches generate no interrupt so they need to be
223 * monitored by a timer.
225 * We debounce the switches and pass them to the input system.
227 * gprr == 0x00 - Keyboard with Landscape Screen
228 * 0x08 - No Keyboard with Portrait Screen
229 * 0x0c - Keyboard and Screen Closed
232 #define HINGE_STABLE_COUNT 2
233 static int sharpsl_hinge_state;
234 static int hinge_count;
236 static void corgikbd_hinge_timer(unsigned long data)
238 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
242 gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
243 if (gprr != sharpsl_hinge_state) {
245 sharpsl_hinge_state = gprr;
246 } else if (hinge_count < HINGE_STABLE_COUNT) {
248 if (hinge_count >= HINGE_STABLE_COUNT) {
249 spin_lock_irqsave(&corgikbd_data->lock, flags);
251 input_report_switch(corgikbd_data->input, SW_0, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
252 input_report_switch(corgikbd_data->input, SW_1, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
253 input_sync(corgikbd_data->input);
255 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
258 mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
262 static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
264 struct corgikbd *corgikbd = platform_get_drvdata(dev);
265 corgikbd->suspended = 1;
270 static int corgikbd_resume(struct platform_device *dev)
272 struct corgikbd *corgikbd = platform_get_drvdata(dev);
274 /* Upon resume, ignore the suspend key for a short while */
275 corgikbd->suspend_jiffies=jiffies;
276 corgikbd->suspended = 0;
281 #define corgikbd_suspend NULL
282 #define corgikbd_resume NULL
285 static int __init corgikbd_probe(struct platform_device *pdev)
287 struct corgikbd *corgikbd;
288 struct input_dev *input_dev;
291 corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
292 input_dev = input_allocate_device();
293 if (!corgikbd || !input_dev) {
295 input_free_device(input_dev);
299 platform_set_drvdata(pdev, corgikbd);
301 corgikbd->input = input_dev;
302 spin_lock_init(&corgikbd->lock);
304 /* Init Keyboard rescan timer */
305 init_timer(&corgikbd->timer);
306 corgikbd->timer.function = corgikbd_timer_callback;
307 corgikbd->timer.data = (unsigned long) corgikbd;
309 /* Init Hinge Timer */
310 init_timer(&corgikbd->htimer);
311 corgikbd->htimer.function = corgikbd_hinge_timer;
312 corgikbd->htimer.data = (unsigned long) corgikbd;
314 corgikbd->suspend_jiffies=jiffies;
316 memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
318 input_dev->name = "Corgi Keyboard";
319 input_dev->phys = "corgikbd/input0";
320 input_dev->id.bustype = BUS_HOST;
321 input_dev->id.vendor = 0x0001;
322 input_dev->id.product = 0x0001;
323 input_dev->id.version = 0x0100;
324 input_dev->cdev.dev = &pdev->dev;
325 input_dev->private = corgikbd;
327 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);
328 input_dev->keycode = corgikbd->keycode;
329 input_dev->keycodesize = sizeof(unsigned char);
330 input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
332 for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
333 set_bit(corgikbd->keycode[i], input_dev->keybit);
334 clear_bit(0, input_dev->keybit);
335 set_bit(SW_0, input_dev->swbit);
336 set_bit(SW_1, input_dev->swbit);
338 input_register_device(corgikbd->input);
340 mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);
342 /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
343 for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
344 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
345 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
346 SA_INTERRUPT, "corgikbd", corgikbd))
347 printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
349 set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);
352 /* Set Strobe lines as outputs - set high */
353 for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
354 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
359 static int corgikbd_remove(struct platform_device *pdev)
362 struct corgikbd *corgikbd = platform_get_drvdata(pdev);
364 for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
365 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
367 del_timer_sync(&corgikbd->htimer);
368 del_timer_sync(&corgikbd->timer);
370 input_unregister_device(corgikbd->input);
377 static struct platform_driver corgikbd_driver = {
378 .probe = corgikbd_probe,
379 .remove = corgikbd_remove,
380 .suspend = corgikbd_suspend,
381 .resume = corgikbd_resume,
383 .name = "corgi-keyboard",
387 static int __devinit corgikbd_init(void)
389 return platform_driver_register(&corgikbd_driver);
392 static void __exit corgikbd_exit(void)
394 platform_driver_unregister(&corgikbd_driver);
397 module_init(corgikbd_init);
398 module_exit(corgikbd_exit);
400 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
401 MODULE_DESCRIPTION("Corgi Keyboard Driver");
402 MODULE_LICENSE("GPLv2");