diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/input/keyboard/imx_keypad.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/input/keyboard/imx_keypad.c | 627 |
1 files changed, 0 insertions, 627 deletions
diff --git a/ANDROID_3.4.5/drivers/input/keyboard/imx_keypad.c b/ANDROID_3.4.5/drivers/input/keyboard/imx_keypad.c deleted file mode 100644 index fb87b3bc..00000000 --- a/ANDROID_3.4.5/drivers/input/keyboard/imx_keypad.c +++ /dev/null @@ -1,627 +0,0 @@ -/* - * Driver for the IMX keypad port. - * Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> - * - * 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. - * - * <<Power management needs to be implemented>>. - */ - -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/input/matrix_keypad.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/jiffies.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/timer.h> - -/* - * Keypad Controller registers (halfword) - */ -#define KPCR 0x00 /* Keypad Control Register */ - -#define KPSR 0x02 /* Keypad Status Register */ -#define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ -#define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ -#define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ -#define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ -#define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ -#define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ -#define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ - -#define KDDR 0x04 /* Keypad Data Direction Register */ -#define KPDR 0x06 /* Keypad Data Register */ - -#define MAX_MATRIX_KEY_ROWS 8 -#define MAX_MATRIX_KEY_COLS 8 -#define MATRIX_ROW_SHIFT 3 - -#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) - -struct imx_keypad { - - struct clk *clk; - struct input_dev *input_dev; - void __iomem *mmio_base; - - int irq; - struct timer_list check_matrix_timer; - - /* - * The matrix is stable only if no changes are detected after - * IMX_KEYPAD_SCANS_FOR_STABILITY scans - */ -#define IMX_KEYPAD_SCANS_FOR_STABILITY 3 - int stable_count; - - bool enabled; - - /* Masks for enabled rows/cols */ - unsigned short rows_en_mask; - unsigned short cols_en_mask; - - unsigned short keycodes[MAX_MATRIX_KEY_NUM]; - - /* - * Matrix states: - * -stable: achieved after a complete debounce process. - * -unstable: used in the debouncing process. - */ - unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; - unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; -}; - -/* Scan the matrix and return the new state in *matrix_volatile_state. */ -static void imx_keypad_scan_matrix(struct imx_keypad *keypad, - unsigned short *matrix_volatile_state) -{ - int col; - unsigned short reg_val; - - for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { - if ((keypad->cols_en_mask & (1 << col)) == 0) - continue; - /* - * Discharge keypad capacitance: - * 2. write 1s on column data. - * 3. configure columns as totem-pole to discharge capacitance. - * 4. configure columns as open-drain. - */ - reg_val = readw(keypad->mmio_base + KPDR); - reg_val |= 0xff00; - writew(reg_val, keypad->mmio_base + KPDR); - - reg_val = readw(keypad->mmio_base + KPCR); - reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); - writew(reg_val, keypad->mmio_base + KPCR); - - udelay(2); - - reg_val = readw(keypad->mmio_base + KPCR); - reg_val |= (keypad->cols_en_mask & 0xff) << 8; - writew(reg_val, keypad->mmio_base + KPCR); - - /* - * 5. Write a single column to 0, others to 1. - * 6. Sample row inputs and save data. - * 7. Repeat steps 2 - 6 for remaining columns. - */ - reg_val = readw(keypad->mmio_base + KPDR); - reg_val &= ~(1 << (8 + col)); - writew(reg_val, keypad->mmio_base + KPDR); - - /* - * Delay added to avoid propagating the 0 from column to row - * when scanning. - */ - udelay(5); - - /* - * 1s in matrix_volatile_state[col] means key pressures - * throw data from non enabled rows. - */ - reg_val = readw(keypad->mmio_base + KPDR); - matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; - } - - /* - * Return in standby mode: - * 9. write 0s to columns - */ - reg_val = readw(keypad->mmio_base + KPDR); - reg_val &= 0x00ff; - writew(reg_val, keypad->mmio_base + KPDR); -} - -/* - * Compare the new matrix state (volatile) with the stable one stored in - * keypad->matrix_stable_state and fire events if changes are detected. - */ -static void imx_keypad_fire_events(struct imx_keypad *keypad, - unsigned short *matrix_volatile_state) -{ - struct input_dev *input_dev = keypad->input_dev; - int row, col; - - for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { - unsigned short bits_changed; - int code; - - if ((keypad->cols_en_mask & (1 << col)) == 0) - continue; /* Column is not enabled */ - - bits_changed = keypad->matrix_stable_state[col] ^ - matrix_volatile_state[col]; - - if (bits_changed == 0) - continue; /* Column does not contain changes */ - - for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { - if ((keypad->rows_en_mask & (1 << row)) == 0) - continue; /* Row is not enabled */ - if ((bits_changed & (1 << row)) == 0) - continue; /* Row does not contain changes */ - - code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); - input_event(input_dev, EV_MSC, MSC_SCAN, code); - input_report_key(input_dev, keypad->keycodes[code], - matrix_volatile_state[col] & (1 << row)); - dev_dbg(&input_dev->dev, "Event code: %d, val: %d", - keypad->keycodes[code], - matrix_volatile_state[col] & (1 << row)); - } - } - input_sync(input_dev); -} - -/* - * imx_keypad_check_for_events is the timer handler. - */ -static void imx_keypad_check_for_events(unsigned long data) -{ - struct imx_keypad *keypad = (struct imx_keypad *) data; - unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; - unsigned short reg_val; - bool state_changed, is_zero_matrix; - int i; - - memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); - - imx_keypad_scan_matrix(keypad, matrix_volatile_state); - - state_changed = false; - for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { - if ((keypad->cols_en_mask & (1 << i)) == 0) - continue; - - if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { - state_changed = true; - break; - } - } - - /* - * If the matrix state is changed from the previous scan - * (Re)Begin the debouncing process, saving the new state in - * keypad->matrix_unstable_state. - * else - * Increase the count of number of scans with a stable state. - */ - if (state_changed) { - memcpy(keypad->matrix_unstable_state, matrix_volatile_state, - sizeof(matrix_volatile_state)); - keypad->stable_count = 0; - } else - keypad->stable_count++; - - /* - * If the matrix is not as stable as we want reschedule scan - * in the near future. - */ - if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { - mod_timer(&keypad->check_matrix_timer, - jiffies + msecs_to_jiffies(10)); - return; - } - - /* - * If the matrix state is stable, fire the events and save the new - * stable state. Note, if the matrix is kept stable for longer - * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all - * events have already been generated. - */ - if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { - imx_keypad_fire_events(keypad, matrix_volatile_state); - - memcpy(keypad->matrix_stable_state, matrix_volatile_state, - sizeof(matrix_volatile_state)); - } - - is_zero_matrix = true; - for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { - if (matrix_volatile_state[i] != 0) { - is_zero_matrix = false; - break; - } - } - - - if (is_zero_matrix) { - /* - * All keys have been released. Enable only the KDI - * interrupt for future key presses (clear the KDI - * status bit and its sync chain before that). - */ - reg_val = readw(keypad->mmio_base + KPSR); - reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; - writew(reg_val, keypad->mmio_base + KPSR); - - reg_val = readw(keypad->mmio_base + KPSR); - reg_val |= KBD_STAT_KDIE; - reg_val &= ~KBD_STAT_KRIE; - writew(reg_val, keypad->mmio_base + KPSR); - } else { - /* - * Some keys are still pressed. Schedule a rescan in - * attempt to detect multiple key presses and enable - * the KRI interrupt to react quickly to key release - * event. - */ - mod_timer(&keypad->check_matrix_timer, - jiffies + msecs_to_jiffies(60)); - - reg_val = readw(keypad->mmio_base + KPSR); - reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; - writew(reg_val, keypad->mmio_base + KPSR); - - reg_val = readw(keypad->mmio_base + KPSR); - reg_val |= KBD_STAT_KRIE; - reg_val &= ~KBD_STAT_KDIE; - writew(reg_val, keypad->mmio_base + KPSR); - } -} - -static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) -{ - struct imx_keypad *keypad = dev_id; - unsigned short reg_val; - - reg_val = readw(keypad->mmio_base + KPSR); - - /* Disable both interrupt types */ - reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); - /* Clear interrupts status bits */ - reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; - writew(reg_val, keypad->mmio_base + KPSR); - - if (keypad->enabled) { - /* The matrix is supposed to be changed */ - keypad->stable_count = 0; - - /* Schedule the scanning procedure near in the future */ - mod_timer(&keypad->check_matrix_timer, - jiffies + msecs_to_jiffies(2)); - } - - return IRQ_HANDLED; -} - -static void imx_keypad_config(struct imx_keypad *keypad) -{ - unsigned short reg_val; - - /* - * Include enabled rows in interrupt generation (KPCR[7:0]) - * Configure keypad columns as open-drain (KPCR[15:8]) - */ - reg_val = readw(keypad->mmio_base + KPCR); - reg_val |= keypad->rows_en_mask & 0xff; /* rows */ - reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ - writew(reg_val, keypad->mmio_base + KPCR); - - /* Write 0's to KPDR[15:8] (Colums) */ - reg_val = readw(keypad->mmio_base + KPDR); - reg_val &= 0x00ff; - writew(reg_val, keypad->mmio_base + KPDR); - - /* Configure columns as output, rows as input (KDDR[15:0]) */ - writew(0xff00, keypad->mmio_base + KDDR); - - /* - * Clear Key Depress and Key Release status bit. - * Clear both synchronizer chain. - */ - reg_val = readw(keypad->mmio_base + KPSR); - reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | - KBD_STAT_KDSC | KBD_STAT_KRSS; - writew(reg_val, keypad->mmio_base + KPSR); - - /* Enable KDI and disable KRI (avoid false release events). */ - reg_val |= KBD_STAT_KDIE; - reg_val &= ~KBD_STAT_KRIE; - writew(reg_val, keypad->mmio_base + KPSR); -} - -static void imx_keypad_inhibit(struct imx_keypad *keypad) -{ - unsigned short reg_val; - - /* Inhibit KDI and KRI interrupts. */ - reg_val = readw(keypad->mmio_base + KPSR); - reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); - writew(reg_val, keypad->mmio_base + KPSR); - - /* Colums as open drain and disable all rows */ - writew(0xff00, keypad->mmio_base + KPCR); -} - -static void imx_keypad_close(struct input_dev *dev) -{ - struct imx_keypad *keypad = input_get_drvdata(dev); - - dev_dbg(&dev->dev, ">%s\n", __func__); - - /* Mark keypad as being inactive */ - keypad->enabled = false; - synchronize_irq(keypad->irq); - del_timer_sync(&keypad->check_matrix_timer); - - imx_keypad_inhibit(keypad); - - /* Disable clock unit */ - clk_disable(keypad->clk); -} - -static int imx_keypad_open(struct input_dev *dev) -{ - struct imx_keypad *keypad = input_get_drvdata(dev); - - dev_dbg(&dev->dev, ">%s\n", __func__); - - /* We became active from now */ - keypad->enabled = true; - - /* Enable the kpp clock */ - clk_enable(keypad->clk); - imx_keypad_config(keypad); - - /* Sanity control, not all the rows must be actived now. */ - if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) { - dev_err(&dev->dev, - "too many keys pressed, control pins initialisation\n"); - goto open_err; - } - - return 0; - -open_err: - imx_keypad_close(dev); - return -EIO; -} - -static int __devinit imx_keypad_probe(struct platform_device *pdev) -{ - const struct matrix_keymap_data *keymap_data = pdev->dev.platform_data; - struct imx_keypad *keypad; - struct input_dev *input_dev; - struct resource *res; - int irq, error, i; - - if (keymap_data == NULL) { - dev_err(&pdev->dev, "no keymap defined\n"); - return -EINVAL; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "no irq defined in platform data\n"); - return -EINVAL; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(&pdev->dev, "no I/O memory defined in platform data\n"); - return -EINVAL; - } - - res = request_mem_region(res->start, resource_size(res), pdev->name); - if (res == NULL) { - dev_err(&pdev->dev, "failed to request I/O memory\n"); - return -EBUSY; - } - - input_dev = input_allocate_device(); - if (!input_dev) { - dev_err(&pdev->dev, "failed to allocate the input device\n"); - error = -ENOMEM; - goto failed_rel_mem; - } - - keypad = kzalloc(sizeof(struct imx_keypad), GFP_KERNEL); - if (!keypad) { - dev_err(&pdev->dev, "not enough memory for driver data\n"); - error = -ENOMEM; - goto failed_free_input; - } - - keypad->input_dev = input_dev; - keypad->irq = irq; - keypad->stable_count = 0; - - setup_timer(&keypad->check_matrix_timer, - imx_keypad_check_for_events, (unsigned long) keypad); - - keypad->mmio_base = ioremap(res->start, resource_size(res)); - if (keypad->mmio_base == NULL) { - dev_err(&pdev->dev, "failed to remap I/O memory\n"); - error = -ENOMEM; - goto failed_free_priv; - } - - keypad->clk = clk_get(&pdev->dev, "kpp"); - if (IS_ERR(keypad->clk)) { - dev_err(&pdev->dev, "failed to get keypad clock\n"); - error = PTR_ERR(keypad->clk); - goto failed_unmap; - } - - /* Search for rows and cols enabled */ - for (i = 0; i < keymap_data->keymap_size; i++) { - keypad->rows_en_mask |= 1 << KEY_ROW(keymap_data->keymap[i]); - keypad->cols_en_mask |= 1 << KEY_COL(keymap_data->keymap[i]); - } - - if (keypad->rows_en_mask > ((1 << MAX_MATRIX_KEY_ROWS) - 1) || - keypad->cols_en_mask > ((1 << MAX_MATRIX_KEY_COLS) - 1)) { - dev_err(&pdev->dev, - "invalid key data (too many rows or colums)\n"); - error = -EINVAL; - goto failed_clock_put; - } - dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask); - dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask); - - /* Init the Input device */ - input_dev->name = pdev->name; - input_dev->id.bustype = BUS_HOST; - input_dev->dev.parent = &pdev->dev; - input_dev->open = imx_keypad_open; - input_dev->close = imx_keypad_close; - input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); - input_dev->keycode = keypad->keycodes; - input_dev->keycodesize = sizeof(keypad->keycodes[0]); - input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); - - matrix_keypad_build_keymap(keymap_data, MATRIX_ROW_SHIFT, - keypad->keycodes, input_dev->keybit); - - input_set_capability(input_dev, EV_MSC, MSC_SCAN); - input_set_drvdata(input_dev, keypad); - - /* Ensure that the keypad will stay dormant until opened */ - imx_keypad_inhibit(keypad); - - error = request_irq(irq, imx_keypad_irq_handler, 0, - pdev->name, keypad); - if (error) { - dev_err(&pdev->dev, "failed to request IRQ\n"); - goto failed_clock_put; - } - - /* Register the input device */ - error = input_register_device(input_dev); - if (error) { - dev_err(&pdev->dev, "failed to register input device\n"); - goto failed_free_irq; - } - - platform_set_drvdata(pdev, keypad); - device_init_wakeup(&pdev->dev, 1); - - return 0; - -failed_free_irq: - free_irq(irq, pdev); -failed_clock_put: - clk_put(keypad->clk); -failed_unmap: - iounmap(keypad->mmio_base); -failed_free_priv: - kfree(keypad); -failed_free_input: - input_free_device(input_dev); -failed_rel_mem: - release_mem_region(res->start, resource_size(res)); - return error; -} - -static int __devexit imx_keypad_remove(struct platform_device *pdev) -{ - struct imx_keypad *keypad = platform_get_drvdata(pdev); - struct resource *res; - - dev_dbg(&pdev->dev, ">%s\n", __func__); - - platform_set_drvdata(pdev, NULL); - - input_unregister_device(keypad->input_dev); - - free_irq(keypad->irq, keypad); - clk_put(keypad->clk); - - iounmap(keypad->mmio_base); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(res->start, resource_size(res)); - - kfree(keypad); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int imx_kbd_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct imx_keypad *kbd = platform_get_drvdata(pdev); - struct input_dev *input_dev = kbd->input_dev; - - /* imx kbd can wake up system even clock is disabled */ - mutex_lock(&input_dev->mutex); - - if (input_dev->users) - clk_disable(kbd->clk); - - mutex_unlock(&input_dev->mutex); - - if (device_may_wakeup(&pdev->dev)) - enable_irq_wake(kbd->irq); - - return 0; -} - -static int imx_kbd_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct imx_keypad *kbd = platform_get_drvdata(pdev); - struct input_dev *input_dev = kbd->input_dev; - - if (device_may_wakeup(&pdev->dev)) - disable_irq_wake(kbd->irq); - - mutex_lock(&input_dev->mutex); - - if (input_dev->users) - clk_enable(kbd->clk); - - mutex_unlock(&input_dev->mutex); - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume); - -static struct platform_driver imx_keypad_driver = { - .driver = { - .name = "imx-keypad", - .owner = THIS_MODULE, - .pm = &imx_kbd_pm_ops, - }, - .probe = imx_keypad_probe, - .remove = __devexit_p(imx_keypad_remove), -}; -module_platform_driver(imx_keypad_driver); - -MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); -MODULE_DESCRIPTION("IMX Keypad Port Driver"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:imx-keypad"); |