diff options
Diffstat (limited to 'drivers/input/keyboard/corgikbd.c')
| -rw-r--r-- | drivers/input/keyboard/corgikbd.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/drivers/input/keyboard/corgikbd.c b/drivers/input/keyboard/corgikbd.c new file mode 100644 index 0000000..c8ed065 --- /dev/null +++ b/drivers/input/keyboard/corgikbd.c @@ -0,0 +1,416 @@ +/* + * 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/platform_device.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <mach/corgi.h> +#include <mach/hardware.h> +#include <mach/pxa-regs.h> +#include <mach/pxa2xx-gpio.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 */ +#define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 ) + +#define SCAN_INTERVAL (50) /* ms */ +#define HINGE_SCAN_INTERVAL (250) /* ms */ + +#define CORGI_KEY_CALENDER KEY_F1 +#define CORGI_KEY_ADDRESS KEY_F2 +#define CORGI_KEY_FN KEY_F3 +#define CORGI_KEY_CANCEL KEY_F4 +#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_MAIL KEY_F10 +#define CORGI_KEY_OK KEY_F11 +#define CORGI_KEY_MENU KEY_F12 + +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 */ + 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 */ + 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 */ + CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */ +}; + + +struct corgikbd { + unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)]; + struct input_dev *input; + + spinlock_t lock; + struct timer_list timer; + struct timer_list htimer; + + unsigned int suspended; + unsigned long suspend_jiffies; +}; + +#define KB_DISCHARGE_DELAY 10 +#define KB_ACTIVATE_DELAY 10 + +/* Helper functions for reading the keyboard matrix + * Note: We should really be using the generic gpio functions 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) +{ + unsigned int row, col, rowd; + unsigned long flags; + unsigned int num_pressed; + + if (corgikbd_data->suspended) + return; + + spin_lock_irqsave(&corgikbd_data->lock, flags); + + 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++) { + unsigned int scancode, pressed; + + scancode = SCANCODE(row, col); + pressed = rowd & KB_ROWMASK(row); + + input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed); + + if (pressed) + num_pressed++; + + if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF) + && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) { + input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1); + corgikbd_data->suspend_jiffies=jiffies; + } + } + 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 + msecs_to_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 corgikbd *corgikbd_data = dev_id; + + if (!timer_pending(&corgikbd_data->timer)) { + /** wait chattering delay **/ + udelay(20); + corgikbd_scankeyboard(corgikbd_data); + } + + 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); +} + +/* + * The hinge switches generate no interrupt so they need to be + * monitored by a timer. + * + * We debounce the switches and pass them to the input system. + * + * gprr == 0x00 - Keyboard with Landscape Screen + * 0x08 - No Keyboard with Portrait Screen + * 0x0c - Keyboard and Screen Closed + */ + +#define READ_GPIO_BIT(x) (GPLR(x) & GPIO_bit(x)) +#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(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB); + gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0); + 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); + + input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0)); + input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0)); + input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0)); + input_sync(corgikbd_data->input); + + spin_unlock_irqrestore(&corgikbd_data->lock, flags); + } + } + mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL)); +} + +#ifdef CONFIG_PM +static int corgikbd_suspend(struct platform_device *dev, pm_message_t state) +{ + int i; + struct corgikbd *corgikbd = platform_get_drvdata(dev); + + corgikbd->suspended = 1; + /* strobe 0 is the power key so this can't be made an input for + powersaving therefore i = 1 */ + for (i = 1; i < CORGI_KEY_STROBE_NUM; i++) + pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN); + + return 0; +} + +static int corgikbd_resume(struct platform_device *dev) +{ + int i; + struct corgikbd *corgikbd = platform_get_drvdata(dev); + + for (i = 1; i < CORGI_KEY_STROBE_NUM; i++) + pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH); + + /* Upon resume, ignore the suspend key for a short while */ + corgikbd->suspend_jiffies=jiffies; + corgikbd->suspended = 0; + + return 0; +} +#else +#define corgikbd_suspend NULL +#define corgikbd_resume NULL +#endif + +static int __init corgikbd_probe(struct platform_device *pdev) +{ + struct corgikbd *corgikbd; + struct input_dev *input_dev; + int i, err = -ENOMEM; + + corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!corgikbd || !input_dev) + goto fail; + + platform_set_drvdata(pdev, corgikbd); + + corgikbd->input = input_dev; + 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; + + corgikbd->suspend_jiffies=jiffies; + + memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode)); + + input_dev->name = "Corgi Keyboard"; + input_dev->phys = "corgikbd/input0"; + input_dev->id.bustype = BUS_HOST; + input_dev->id.vendor = 0x0001; + input_dev->id.product = 0x0001; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &pdev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | + BIT_MASK(EV_PWR) | BIT_MASK(EV_SW); + input_dev->keycode = corgikbd->keycode; + input_dev->keycodesize = sizeof(unsigned char); + input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode); + + for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++) + set_bit(corgikbd->keycode[i], input_dev->keybit); + clear_bit(0, input_dev->keybit); + set_bit(SW_LID, input_dev->swbit); + set_bit(SW_TABLET_MODE, input_dev->swbit); + set_bit(SW_HEADPHONE_INSERT, input_dev->swbit); + + err = input_register_device(corgikbd->input); + if (err) + goto fail; + + mod_timer(&corgikbd->htimer, jiffies + msecs_to_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, + IRQF_DISABLED | IRQF_TRIGGER_RISING, + "corgikbd", corgikbd)) + printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i); + } + + /* 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); + + /* Setup the headphone jack as an input */ + pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN); + + return 0; + + fail: input_free_device(input_dev); + kfree(corgikbd); + return err; +} + +static int corgikbd_remove(struct platform_device *pdev) +{ + int i; + struct corgikbd *corgikbd = platform_get_drvdata(pdev); + + 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 platform_driver corgikbd_driver = { + .probe = corgikbd_probe, + .remove = corgikbd_remove, + .suspend = corgikbd_suspend, + .resume = corgikbd_resume, + .driver = { + .name = "corgi-keyboard", + .owner = THIS_MODULE, + }, +}; + +static int __devinit corgikbd_init(void) +{ + return platform_driver_register(&corgikbd_driver); +} + +static void __exit corgikbd_exit(void) +{ + platform_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("GPL v2"); +MODULE_ALIAS("platform:corgi-keyboard"); |
