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/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)
36 #define CORGIKBD_PRESSED 1
38 #define HINGE_SCAN_INTERVAL (HZ/4)
40 #define CORGI_KEY_CALENDER KEY_F1
41 #define CORGI_KEY_ADDRESS KEY_F2
42 #define CORGI_KEY_FN KEY_F3
43 #define CORGI_KEY_CANCEL KEY_F4
44 #define CORGI_KEY_OFF KEY_SUSPEND
45 #define CORGI_KEY_EXOK KEY_F5
46 #define CORGI_KEY_EXCANCEL KEY_F6
47 #define CORGI_KEY_EXJOGDOWN KEY_F7
48 #define CORGI_KEY_EXJOGUP KEY_F8
49 #define CORGI_KEY_JAP1 KEY_LEFTCTRL
50 #define CORGI_KEY_JAP2 KEY_LEFTALT
51 #define CORGI_KEY_MAIL KEY_F10
52 #define CORGI_KEY_OK KEY_F11
53 #define CORGI_KEY_MENU KEY_F12
54 #define CORGI_HINGE_0 KEY_KP0
55 #define CORGI_HINGE_1 KEY_KP1
56 #define CORGI_HINGE_2 KEY_KP2
58 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
60 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 */
61 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 */
62 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 */
63 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 */
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 */
65 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 */
66 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 */
67 CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
68 CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2 /* 125-127 */
73 unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
74 struct input_dev input;
77 unsigned char state[ARRAY_SIZE(corgikbd_keycode)];
80 struct timer_list timer;
81 struct timer_list htimer;
83 unsigned int suspended;
84 unsigned long suspend_jiffies;
87 static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data)
89 if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {
90 corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;
91 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);
92 if ((corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
93 && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
94 input_event(&corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
95 corgikbd_data->suspend_jiffies=jiffies;
97 } else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {
98 corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;
99 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);
103 #define KB_DISCHARGE_DELAY 10
104 #define KB_ACTIVATE_DELAY 10
106 /* Helper functions for reading the keyboard matrix
107 * Note: We should really be using pxa_gpio_mode to alter GPDR but it
108 * requires a function call per GPIO bit which is excessive
109 * when we need to access 12 bits at once multiple times.
110 * These functions must be called within local_irq_save()/local_irq_restore()
113 static inline void corgikbd_discharge_all(void)
116 GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
117 GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
120 static inline void corgikbd_activate_all(void)
122 // STROBE ALL -> High
123 GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
124 GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
126 udelay(KB_DISCHARGE_DELAY);
128 // Clear any interrupts we may have triggered when altering the GPIO lines
129 GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
130 GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
133 static inline void corgikbd_activate_col(int col)
135 // STROBE col -> High, not col -> HiZ
136 GPSR2 = CORGI_GPIO_STROBE_BIT(col);
137 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
140 static inline void corgikbd_reset_col(int col)
143 GPCR2 = CORGI_GPIO_STROBE_BIT(col);
144 // STROBE col -> out, not col -> HiZ
145 GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
148 #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))
151 * The corgi keyboard only generates interrupts when a key is pressed.
152 * When a key is pressed, we enable a timer which then scans the
153 * keyboard to detect when the key is released.
156 /* Scan the hardware keyboard and push any changes up through the input layer */
157 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
159 unsigned int row, col, rowd, scancode;
161 unsigned int num_pressed;
163 if (corgikbd_data->suspended)
166 spin_lock_irqsave(&corgikbd_data->lock, flags);
169 input_regs(&corgikbd_data->input, regs);
172 for (col = 0; col < KB_COLS; col++) {
174 * Discharge the output driver capacitatance
175 * in the keyboard matrix. (Yes it is significant..)
178 corgikbd_discharge_all();
179 udelay(KB_DISCHARGE_DELAY);
181 corgikbd_activate_col(col);
182 udelay(KB_ACTIVATE_DELAY);
184 rowd = GET_ROWS_STATUS(col);
185 for (row = 0; row < KB_ROWS; row++) {
186 scancode = SCANCODE(row, col);
187 handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);
188 if (rowd & KB_ROWMASK(row))
191 corgikbd_reset_col(col);
194 corgikbd_activate_all();
196 input_sync(&corgikbd_data->input);
198 /* if any keys are pressed, enable the timer */
200 mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
202 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
206 * corgi keyboard interrupt handler.
208 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
210 struct corgikbd *corgikbd_data = dev_id;
212 if (!timer_pending(&corgikbd_data->timer)) {
213 /** wait chattering delay **/
215 corgikbd_scankeyboard(corgikbd_data, regs);
222 * corgi timer checking for released keys
224 static void corgikbd_timer_callback(unsigned long data)
226 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
227 corgikbd_scankeyboard(corgikbd_data, NULL);
231 * The hinge switches generate no interrupt so they need to be
232 * monitored by a timer.
234 * When we detect changes, we debounce it and then pass the three
235 * positions the system can take as keypresses to the input system.
238 #define HINGE_STABLE_COUNT 2
239 static int sharpsl_hinge_state;
240 static int hinge_count;
242 static void corgikbd_hinge_timer(unsigned long data)
244 struct corgikbd *corgikbd_data = (struct corgikbd *) data;
248 gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
249 if (gprr != sharpsl_hinge_state) {
251 sharpsl_hinge_state = gprr;
252 } else if (hinge_count < HINGE_STABLE_COUNT) {
254 if (hinge_count >= HINGE_STABLE_COUNT) {
255 spin_lock_irqsave(&corgikbd_data->lock, flags);
257 handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */
258 handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */
259 handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed */
260 input_sync(&corgikbd_data->input);
262 spin_unlock_irqrestore(&corgikbd_data->lock, flags);
265 mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
269 static int corgikbd_suspend(struct device *dev, pm_message_t state, uint32_t level)
271 if (level == SUSPEND_POWER_DOWN) {
272 struct corgikbd *corgikbd = dev_get_drvdata(dev);
273 corgikbd->suspended = 1;
278 static int corgikbd_resume(struct device *dev, uint32_t level)
280 if (level == RESUME_POWER_ON) {
281 struct corgikbd *corgikbd = dev_get_drvdata(dev);
283 /* Upon resume, ignore the suspend key for a short while */
284 corgikbd->suspend_jiffies=jiffies;
285 corgikbd->suspended = 0;
290 #define corgikbd_suspend NULL
291 #define corgikbd_resume NULL
294 static int __init corgikbd_probe(struct device *dev)
297 struct corgikbd *corgikbd;
299 corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
303 dev_set_drvdata(dev,corgikbd);
304 strcpy(corgikbd->phys, "corgikbd/input0");
306 spin_lock_init(&corgikbd->lock);
308 /* Init Keyboard rescan timer */
309 init_timer(&corgikbd->timer);
310 corgikbd->timer.function = corgikbd_timer_callback;
311 corgikbd->timer.data = (unsigned long) corgikbd;
313 /* Init Hinge Timer */
314 init_timer(&corgikbd->htimer);
315 corgikbd->htimer.function = corgikbd_hinge_timer;
316 corgikbd->htimer.data = (unsigned long) corgikbd;
318 corgikbd->suspend_jiffies=jiffies;
320 init_input_dev(&corgikbd->input);
321 corgikbd->input.private = corgikbd;
322 corgikbd->input.name = "Corgi Keyboard";
323 corgikbd->input.dev = dev;
324 corgikbd->input.phys = corgikbd->phys;
325 corgikbd->input.id.bustype = BUS_HOST;
326 corgikbd->input.id.vendor = 0x0001;
327 corgikbd->input.id.product = 0x0001;
328 corgikbd->input.id.version = 0x0100;
329 corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);
330 corgikbd->input.keycode = corgikbd->keycode;
331 corgikbd->input.keycodesize = sizeof(unsigned char);
332 corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);
334 memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
335 for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
336 set_bit(corgikbd->keycode[i], corgikbd->input.keybit);
337 clear_bit(0, corgikbd->input.keybit);
339 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);
356 printk(KERN_INFO "input: Corgi Keyboard Registered\n");
361 static int corgikbd_remove(struct device *dev)
364 struct corgikbd *corgikbd = dev_get_drvdata(dev);
366 for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
367 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
369 del_timer_sync(&corgikbd->htimer);
370 del_timer_sync(&corgikbd->timer);
372 input_unregister_device(&corgikbd->input);
379 static struct device_driver corgikbd_driver = {
380 .name = "corgi-keyboard",
381 .bus = &platform_bus_type,
382 .probe = corgikbd_probe,
383 .remove = corgikbd_remove,
384 .suspend = corgikbd_suspend,
385 .resume = corgikbd_resume,
388 static int __devinit corgikbd_init(void)
390 return driver_register(&corgikbd_driver);
393 static void __exit corgikbd_exit(void)
395 driver_unregister(&corgikbd_driver);
398 module_init(corgikbd_init);
399 module_exit(corgikbd_exit);
401 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
402 MODULE_DESCRIPTION("Corgi Keyboard Driver");
403 MODULE_LICENSE("GPLv2");