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/device.h>
16 #include <linux/init.h>
17 #include <linux/input.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
23 #include <asm/arch/corgi.h>
24 #include <asm/arch/hardware.h>
25 #include <asm/arch/pxa-regs.h>
26 #include <asm/hardware/scoop.h>
30 #define KB_ROWMASK(r) (1 << (r))
31 #define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
32 /* zero code, 124 scancodes + 3 hinge combinations */
33 #define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )
34 #define SCAN_INTERVAL (HZ/10)
35 #define CORGIKBD_PRESSED 1
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 unsigned char state[ARRAY_SIZE(corgikbd_keycode)];
79 struct timer_list timer;
80 struct timer_list htimer;
83 static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data)
85 if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {
86 corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;
87 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);
88 if (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
89 input_event(&corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
90 } else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {
91 corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;
92 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);
96 #define KB_DISCHARGE_DELAY 10
97 #define KB_ACTIVATE_DELAY 10
99 /* Helper functions for reading the keyboard matrix
100 * Note: We should really be using pxa_gpio_mode to alter GPDR but it
101 * requires a function call per GPIO bit which is excessive
102 * when we need to access 12 bits at once multiple times.
103 * These functions must be called within local_irq_save()/local_irq_restore()
106 static inline void corgikbd_discharge_all(void)
109 GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
110 GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
113 static inline void corgikbd_activate_all(void)
115 // STROBE ALL -> High
116 GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
117 GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
119 udelay(KB_DISCHARGE_DELAY);
121 // Clear any interrupts we may have triggered when altering the GPIO lines
122 GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
123 GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
126 static inline void corgikbd_activate_col(int col)
128 // STROBE col -> High, not col -> HiZ
129 GPSR2 = CORGI_GPIO_STROBE_BIT(col);
130 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
133 static inline void corgikbd_reset_col(int col)
136 GPCR2 = CORGI_GPIO_STROBE_BIT(col);
137 // STROBE col -> out, not col -> HiZ
138 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
141 #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))
144 * The corgi keyboard only generates interrupts when a key is pressed.
145 * When a key is pressed, we enable a timer which then scans the
146 * keyboard to detect when the key is released.
149 /* Scan the hardware keyboard and push any changes up through the input layer */
150 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
152 unsigned int row, col, rowd, scancode;
154 unsigned int num_pressed;
156 spin_lock_irqsave(&corgikbd_data->lock, flags);
159 input_regs(&corgikbd_data->input, regs);
162 for (col = 0; col < KB_COLS; col++) {
164 * Discharge the output driver capacitatance
165 * in the keyboard matrix. (Yes it is significant..)
168 corgikbd_discharge_all();
169 udelay(KB_DISCHARGE_DELAY);
171 corgikbd_activate_col(col);
172 udelay(KB_ACTIVATE_DELAY);
174 rowd = GET_ROWS_STATUS(col);
175 for (row = 0; row < KB_ROWS; row++) {
176 scancode = SCANCODE(row, col);
177 handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);
178 if (rowd & KB_ROWMASK(row))
181 corgikbd_reset_col(col);
184 corgikbd_activate_all();
186 input_sync(&corgikbd_data->input);
188 /* if any keys are pressed, enable the timer */
190 mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
192 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
196 * corgi keyboard interrupt handler.
198 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
200 struct corgikbd *corgikbd_data = dev_id;
202 if (!timer_pending(&corgikbd_data->timer)) {
203 /** wait chattering delay **/
205 corgikbd_scankeyboard(corgikbd_data, regs);
212 * corgi timer checking for released keys
214 static void corgikbd_timer_callback(unsigned long data)
216 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
217 corgikbd_scankeyboard(corgikbd_data, NULL);
221 * The hinge switches generate no interrupt so they need to be
222 * monitored by a timer.
224 * When we detect changes, we debounce it and then pass the three
225 * positions the system can take as keypresses to the input system.
228 #define HINGE_STABLE_COUNT 2
229 static int sharpsl_hinge_state;
230 static int hinge_count;
232 static void corgikbd_hinge_timer(unsigned long data)
234 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
238 gprr = read_scoop_reg(SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
239 if (gprr != sharpsl_hinge_state) {
241 sharpsl_hinge_state = gprr;
242 } else if (hinge_count < HINGE_STABLE_COUNT) {
244 if (hinge_count >= HINGE_STABLE_COUNT) {
245 spin_lock_irqsave(&corgikbd_data->lock, flags);
247 handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */
248 handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */
249 handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed */
250 input_sync(&corgikbd_data->input);
252 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
255 mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
258 static int __init corgikbd_probe(struct device *dev)
261 struct corgikbd *corgikbd;
263 corgikbd = kcalloc(1, sizeof(struct corgikbd), GFP_KERNEL);
267 dev_set_drvdata(dev,corgikbd);
268 strcpy(corgikbd->phys, "corgikbd/input0");
270 spin_lock_init(corgikbd->lock);
272 /* Init Keyboard rescan timer */
273 init_timer(&corgikbd->timer);
274 corgikbd->timer.function = corgikbd_timer_callback;
275 corgikbd->timer.data = (unsigned long) corgikbd;
277 /* Init Hinge Timer */
278 init_timer(&corgikbd->htimer);
279 corgikbd->htimer.function = corgikbd_hinge_timer;
280 corgikbd->htimer.data = (unsigned long) corgikbd;
282 init_input_dev(&corgikbd->input);
283 corgikbd->input.private = corgikbd;
284 corgikbd->input.name = "Corgi Keyboard";
285 corgikbd->input.dev = dev;
286 corgikbd->input.phys = corgikbd->phys;
287 corgikbd->input.id.bustype = BUS_HOST;
288 corgikbd->input.id.vendor = 0x0001;
289 corgikbd->input.id.product = 0x0001;
290 corgikbd->input.id.version = 0x0100;
291 corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);
292 corgikbd->input.keycode = corgikbd->keycode;
293 corgikbd->input.keycodesize = sizeof(unsigned char);
294 corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);
296 memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
297 for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
298 set_bit(corgikbd->keycode[i], corgikbd->input.keybit);
299 clear_bit(0, corgikbd->input.keybit);
301 input_register_device(&corgikbd->input);
302 mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);
304 /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
305 for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
306 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
307 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
308 SA_INTERRUPT, "corgikbd", corgikbd))
309 printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
311 set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);
314 /* Set Strobe lines as outputs - set high */
315 for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
316 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
318 printk(KERN_INFO "input: Corgi Keyboard Registered\n");
323 static int corgikbd_remove(struct device *dev)
326 struct corgikbd *corgikbd = dev_get_drvdata(dev);
328 for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
329 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
331 del_timer_sync(&corgikbd->htimer);
332 del_timer_sync(&corgikbd->timer);
334 input_unregister_device(&corgikbd->input);
341 static struct device_driver corgikbd_driver = {
342 .name = "corgi-keyboard",
343 .bus = &platform_bus_type,
344 .probe = corgikbd_probe,
345 .remove = corgikbd_remove,
348 static int __devinit corgikbd_init(void)
350 return driver_register(&corgikbd_driver);
353 static void __exit corgikbd_exit(void)
355 driver_unregister(&corgikbd_driver);
358 module_init(corgikbd_init);
359 module_exit(corgikbd_exit);
361 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
362 MODULE_DESCRIPTION("Corgi Keyboard Driver");
363 MODULE_LICENSE("GPLv2");