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    SubjectRE: input: add mxc-keypad driver to support the keypad interface present in the mxc application processors family.
    Date
    From
    On Friday, January 08, 2010 11:58 AM, Alberto Panizzo wrote:
    > The MXC family of Application Processors is shipped with a
    > Keypad Port supported now by this driver.
    >
    > The peripheral can control up to an 8x8 matrix key pad where
    > all the scanning procedure is done via software.
    >
    > The hardware provide two interrupts: one for a key pressed (KDI)
    > and one for all key releases (KRI). There is also a simple circuit for glitch
    > reduction (said for synchronization) made by two series of 3 D-latches
    > that stabilize the interrupts sources.
    > KDI and KRI are fired only if the respective conditions are maintained for
    > at last 4 keypad-clock cycle.
    >
    > Those simple synchronization circuits are used also for multiple
    > key pressures: between a KDI and a KRI the driver reset the
    > sync circuit and re-enable the KDI interrupt so after 3
    > keypad-clock cycle another KDI is fired making possible to repeat
    > the matrix scan operation.
    >
    > This algorithm is done via a threaded management of the keypad
    > interrupt source and delayed by a proper (and longer) debounce
    > interval controlled by the platform initialization.
    > If a key is pressed for a lot of time, the driver relaxes a bit
    > the timings to not over load the cpu in a long time keypad interaction.
    >
    > Key configuration is done via platform initialization in
    > a standard matrix_keypad manner.
    >
    > This driver is tested for build in kernel or as a module
    > and follow the specification of freescale i.MX 25 27 31 35 51
    > especially it is tested in the mx31pdk board.
    >

    You might consider using some of the matrix_keypad support already in
    the kernel. Specific's below.

    >
    > Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
    > ---
    > arch/arm/plat-mxc/include/mach/mxc_keypad.h | 20 ++
    > drivers/input/keyboard/Kconfig | 9 +
    > drivers/input/keyboard/Makefile | 1 +
    > drivers/input/keyboard/mxc_keypad.c | 485 +++++++++++++++++++++++++++
    > 4 files changed, 515 insertions(+), 0 deletions(-)
    > create mode 100644 arch/arm/plat-mxc/include/mach/mxc_keypad.h
    > create mode 100644 drivers/input/keyboard/mxc_keypad.c
    >
    > diff --git a/arch/arm/plat-mxc/include/mach/mxc_keypad.h b/arch/arm/plat-mxc/include/mach/mxc_keypad.h
    > new file mode 100644
    > index 0000000..1b05093
    > --- /dev/null
    > +++ b/arch/arm/plat-mxc/include/mach/mxc_keypad.h
    > @@ -0,0 +1,20 @@
    > +#ifndef __MACH_MXC_KEYPAD_H
    > +#define __MACH_MXC_KEYPAD_H
    > +
    > +#define MAX_MATRIX_KEY_ROWS (8)
    > +#define MAX_MATRIX_KEY_COLS (8)
    > +#define MATRIX_ROW_SHIFT (3)
    > +
    > +struct mxc_keypad_platform_data {
    > +
    > + /* code map for the matrix keys */
    > + unsigned int matrix_key_rows;
    > + unsigned int matrix_key_cols;
    > + unsigned int *matrix_key_map;
    > + int matrix_key_map_size;
    > +
    > + /* key debounce interval */
    > + unsigned int debounce_ms;
    > +};

    You could use struct matrix_keymap_data to hold your matrix_key_map and
    matrix_key_map_size. Take a look at include/linux/input/matrix_keypad.h.

    > +
    > +#endif /* __MACH_MXC_KEYPAD_H */
    > diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
    > index ee98b1b..eff32fe 100644
    > --- a/drivers/input/keyboard/Kconfig
    > +++ b/drivers/input/keyboard/Kconfig
    > @@ -282,6 +282,15 @@ config KEYBOARD_MAX7359
    > To compile this driver as a module, choose M here: the
    > module will be called max7359_keypad.
    >
    > +config KEYBOARD_MXC
    > + tristate "MXC keypad support"
    > + depends on ARCH_MXC
    > + help
    > + Enable support for MXC keypad port.
    > +
    > + To compile this driver as a module, choose M here: the
    > + module will be called mxc_keypad.
    > +
    > config KEYBOARD_NEWTON
    > tristate "Newton keyboard"
    > select SERIO
    > diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
    > index babad5e..9c7133a 100644
    > --- a/drivers/input/keyboard/Makefile
    > +++ b/drivers/input/keyboard/Makefile
    > @@ -23,6 +23,7 @@ obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o
    > obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
    > obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o
    > obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o
    > +obj-$(CONFIG_KEYBOARD_MXC) += mxc_keypad.o
    > obj-$(CONFIG_KEYBOARD_NEWTON) += newtonkbd.o
    > obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
    > obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o
    > diff --git a/drivers/input/keyboard/mxc_keypad.c b/drivers/input/keyboard/mxc_keypad.c
    > new file mode 100644
    > index 0000000..4acd311
    > --- /dev/null
    > +++ b/drivers/input/keyboard/mxc_keypad.c
    > @@ -0,0 +1,485 @@
    > +/*
    > + * linux/drivers/input/keyboard/mxc_keypad.c
    > + *
    > + * Driver for the MXC keypad port.
    > + * Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
    > + * based on Rodolfo Giometti & others work in pxa27x_keypad.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.
    > + *
    > + * >>Power management need 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.h>
    > +#include <linux/input/matrix_keypad.h>

    input.h is not needed if you are including matrix_keypad.h

    > +#include <linux/interrupt.h>
    > +#include <linux/io.h>
    > +#include <linux/kernel.h>
    > +#include <linux/module.h>
    > +#include <linux/platform_device.h>
    > +
    > +#include <mach/mxc_keypad.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 */
    > +#define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit */
    > +#define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit */
    > +#define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit */
    > +#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 keypad_readw(off) __raw_readw(keypad->mmio_base + (off))
    > +#define keypad_writew(off, v) __raw_writew((v), keypad->mmio_base + (off))

    Please make the above macros inline functions.
    See Documentation/CodingStyle, Chapter 12.

    > +
    > +#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
    > +
    > +struct mxc_keypad {
    > + struct mxc_keypad_platform_data *pdata;
    > +
    > + struct clk *clk;
    > + struct input_dev *input_dev;
    > + void __iomem *mmio_base;
    > +
    > + int irq;
    > +
    > +#define MXC_IRQ_DEPRESS 1
    > +#define MXC_IRQ_RELEASE 2
    > + unsigned int irq_type;
    > +
    > + int irq_since_last_change;
    > +
    > + unsigned short keycodes[MAX_MATRIX_KEY_NUM];
    > +
    > + /* state row bits of each column scan */
    > + unsigned short matrix_key_state[MAX_MATRIX_KEY_COLS];
    > +};
    > +
    > +static void mxc_keypad_build_keycode(struct mxc_keypad *keypad)
    > +{
    > + struct mxc_keypad_platform_data *pdata = keypad->pdata;
    > + struct input_dev *input_dev = keypad->input_dev;
    > + unsigned short keycode;
    > + int i;
    > +
    > + for (i = 0; i < pdata->matrix_key_map_size; i++) {
    > + unsigned int key = pdata->matrix_key_map[i];
    > + unsigned int row = KEY_ROW(key);
    > + unsigned int col = KEY_COL(key);
    > + unsigned int scancode = MATRIX_SCAN_CODE(row, col,
    > + MATRIX_ROW_SHIFT);
    > +
    > + keycode = KEY_VAL(key);
    > + keypad->keycodes[scancode] = keycode;
    > + __set_bit(keycode, input_dev->keybit);
    > + }
    > +
    > + __clear_bit(KEY_RESERVED, input_dev->keybit);
    > +}

    You should be able to use matrix_keypad_build_keymap() if you use
    struct matrix_keymap_data as mentioned above.

    > +
    > +/* Return 0 if no changes are detected in matrix */
    > +static int mxc_keypad_scan_matrix(struct mxc_keypad *keypad)
    > +{
    > + struct mxc_keypad_platform_data *pdata = keypad->pdata;
    > + struct input_dev *input_dev = keypad->input_dev;
    > + int row, col, changed = 0;
    > + unsigned short new_state[MAX_MATRIX_KEY_COLS];
    > + unsigned short reg_val;
    > +
    > + memset(new_state, 0, sizeof(new_state));
    > +
    > + for (col = 0; col < pdata->matrix_key_cols; col++) {
    > + /* 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 = keypad_readw(KPDR);
    > + reg_val |= 0xff00;
    > + keypad_writew(KPDR, reg_val);
    > +
    > + reg_val = keypad_readw(KPCR);
    > + reg_val &= ~(((1 << pdata->matrix_key_cols) - 1) << 8);
    > + keypad_writew(KPCR, reg_val);
    > +
    > + udelay(2);
    > +
    > + reg_val = keypad_readw(KPCR);
    > + reg_val |= ((1 << pdata->matrix_key_cols) - 1) << 8;
    > + keypad_writew(KPCR, reg_val);
    > +
    > + /*
    > + * 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 = keypad_readw(KPDR);
    > + reg_val &= ~(1 << (8 + col));
    > + keypad_writew(KPDR, reg_val);
    > +
    > + /* Delay added to avoid propagating the 0 from column to row
    > + * when scanning. */
    > + udelay(5);
    > +
    > + /* 1s in state detect a key pressure */
    > + new_state[col] = (~keypad_readw(KPDR)) & 0x00ff;
    > + }
    > +
    > + /* Test the state changes */
    > + for (col = 0; col < pdata->matrix_key_cols; col++) {
    > + unsigned short bits_changed;
    > + int code;
    > +
    > + bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
    > + if (bits_changed == 0)
    > + continue;
    > +
    > + changed = 1;
    > + for (row = 0; row < pdata->matrix_key_rows; row++) {
    > + if ((bits_changed & (1 << row)) == 0)
    > + continue;
    > +
    > + 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],
    > + new_state[col] & (1 << row));
    > + dev_dbg(&input_dev->dev, "Event code: %d, val: %d",
    > + keypad->keycodes[code],
    > + new_state[col] & (1 << row));
    > + }
    > + }
    > + input_sync(input_dev);
    > + memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
    > +
    > + /* Return in standby mode:
    > + * 9. write 0s to columns */
    > + reg_val = keypad_readw(KPDR);
    > + reg_val &= 0x00ff;
    > + keypad_writew(KPDR, reg_val);
    > +
    > + return changed;
    > +}
    > +
    > +static irqreturn_t mxc_keypad_irq_handler_thread(int irq, void *dev_id)
    > +{
    > + struct mxc_keypad *keypad = dev_id;
    > + struct mxc_keypad_platform_data *pdata = keypad->pdata;
    > + struct input_dev *idev = keypad->input_dev;
    > + unsigned short reg_val;
    > +
    > + dev_dbg(&idev->dev, "Handling Interrupt of type %x\n",
    > + keypad->irq_type);
    > +
    > + /* Wait till debounce */
    > + msleep(pdata->debounce_ms);
    > +
    > + /* Do the scan routine and Keep track for how many time we got
    > + * interrupt that make no change */
    > + if (mxc_keypad_scan_matrix(keypad))
    > + keypad->irq_since_last_change = 0;
    > + else
    > + keypad->irq_since_last_change++;
    > +
    > + /* If the key is pressed since too many time, relax the update period */
    > + if (keypad->irq_since_last_change > 2)
    > + msleep(100);
    > +
    > + /* 10. Clear KPKD and KPKR status bits
    > + * Set the KPKR sync chain and clear the KPKD sync chain */
    > + reg_val = keypad_readw(KPSR);
    > + reg_val |= KBD_STAT_KPKD | KBD_STAT_KPKR |
    > + KBD_STAT_KDSC | KBD_STAT_KRSS;
    > + keypad_writew(KPSR, reg_val);
    > +
    > + /* Re enable interrupts and clear sync reset bits.
    > + * Next KDI is used for detect multiple pressures. */
    > + reg_val = keypad_readw(KPSR);
    > + reg_val &= ~(KBD_STAT_KDSC | KBD_STAT_KRSS);
    > + keypad_writew(KPSR, reg_val);
    > +
    > + reg_val |= KBD_STAT_KDIE | KBD_STAT_KRIE;
    > + if (keypad->irq_type == MXC_IRQ_RELEASE)
    > + reg_val &= ~KBD_STAT_KRIE;
    > + keypad_writew(KPSR, reg_val);
    > +
    > + return IRQ_HANDLED;
    > +}
    > +static irqreturn_t mxc_keypad_irq_handler(int irq, void *dev_id)
    > +{
    > + struct mxc_keypad *keypad = dev_id;
    > + unsigned short reg_val;
    > +
    > + /* Disable every interrupt */
    > + reg_val = keypad_readw(KPSR);
    > + reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
    > + keypad_writew(KPSR, reg_val);
    > +
    > + keypad->irq_type = reg_val & KBD_STAT_KPKD ?
    > + MXC_IRQ_DEPRESS : MXC_IRQ_RELEASE;
    > +
    > + return IRQ_WAKE_THREAD;
    > +}
    > +
    > +static void mxc_keypad_config(struct mxc_keypad *keypad)
    > +{
    > + struct mxc_keypad_platform_data *pdata = keypad->pdata;
    > + unsigned short reg_val;
    > +
    > + /* Enable number of rows in keypad (KPCR[7:0])
    > + * Configure keypad columns as open-drain (KPCR[15:8])
    > + */
    > + reg_val = keypad_readw(KPCR);
    > + reg_val |= (1 << pdata->matrix_key_rows) - 1; /* LSB */
    > + reg_val |= ((1 << pdata->matrix_key_cols) - 1) << 8; /* MSB */
    > + keypad_writew(KPCR, reg_val);
    > +
    > + /* Write 0's to KPDR[15:8] (Colums)*/
    > + reg_val = keypad_readw(KPDR);
    > + reg_val &= 0x00ff;
    > + keypad_writew(KPDR, reg_val);
    > +
    > + /* Configure columns as output, rows as input (KDDR[15:0]) */
    > + reg_val = keypad_readw(KDDR);
    > + reg_val |= 0xff00;
    > + reg_val &= 0xff00;
    > + keypad_writew(KDDR, reg_val);
    > +
    > + /* Clear Key Depress and Key Release status bit.
    > + * Clear synchronizer chain.
    > + * */
    > + reg_val = keypad_readw(KPSR);
    > + reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD |
    > + KBD_STAT_KDSC | KBD_STAT_KRSS;
    > + keypad_writew(KPSR, reg_val);
    > +
    > + /* Set the KDIE control bit, and clear the KRIE control bit
    > + * (avoid false release events). */
    > + reg_val |= KBD_STAT_KDIE;
    > + reg_val &= ~KBD_STAT_KRIE;
    > + keypad_writew(KPSR, reg_val);
    > +}
    > +
    > +static void mxc_keypad_inhibit(struct mxc_keypad *keypad)
    > +{
    > + unsigned short reg_val;
    > +
    > + /* Colums as open drain and disable rows */
    > + keypad_writew(KPCR, 0xff00);
    > +
    > + /* Clear the KPKD status flag and synchronizer chain.
    > + * Clear KDIE control bit and KRIE control bit.
    > + */
    > + reg_val = keypad_readw(KPSR);
    > + reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC;
    > + reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
    > + keypad_writew(KPSR, reg_val);
    > +}
    > +
    > +static int mxc_keypad_open(struct input_dev *dev)
    > +{
    > + struct mxc_keypad *keypad = input_get_drvdata(dev);
    > + struct mxc_keypad_platform_data *pdata = keypad->pdata;
    > +
    > + dev_dbg(&dev->dev, "%s\n", __func__);
    > +
    > + /* Enable unit clock */
    > + clk_enable(keypad->clk);
    > + mxc_keypad_config(keypad);
    > +
    > + /* Sanity control, not all the rows must be to 0s now. */
    > + if ((keypad_readw(KPDR) & ((1 << pdata->matrix_key_rows) - 1)) == 0) {
    > + dev_err(&dev->dev, "Too much keys pressed for now. "
    > + "Control pins initialisation.\n");
    > + goto open_err;
    > + }
    > +
    > + return 0;
    > +
    > +open_err:
    > + mxc_keypad_inhibit(keypad);
    > + return -EIO;
    > +}
    > +
    > +static void mxc_keypad_close(struct input_dev *dev)
    > +{
    > + struct mxc_keypad *keypad = input_get_drvdata(dev);
    > +
    > + mxc_keypad_inhibit(keypad);
    > +
    > + /* Disable clock unit */
    > + clk_disable(keypad->clk);
    > +}
    > +
    > +static int __devinit mxc_keypad_probe(struct platform_device *pdev)
    > +{
    > + struct mxc_keypad_platform_data *pdata = pdev->dev.platform_data;
    > + struct mxc_keypad *keypad;
    > + struct input_dev *input_dev;
    > + struct resource *res;
    > + int irq, error;
    > +
    > + if (pdata == NULL) {
    > + dev_err(&pdev->dev, "no platform data defined\n");
    > + return -EINVAL;
    > + }
    > +
    > + irq = platform_get_irq(pdev, 0);
    > + if (irq < 0) {
    > + dev_err(&pdev->dev, "failed to get keypad irq\n");
    > + return -ENXIO;
    > + }
    > +
    > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    > + if (res == NULL) {
    > + dev_err(&pdev->dev, "failed to get I/O memory\n");
    > + return -ENXIO;
    > + }
    > +
    > + keypad = kzalloc(sizeof(struct mxc_keypad), GFP_KERNEL);
    > + input_dev = input_allocate_device();
    > + if (!keypad || !input_dev) {
    > + dev_err(&pdev->dev, "failed to allocate memory\n");
    > + error = -ENOMEM;
    > + goto failed_free;
    > + }
    > +
    > + keypad->pdata = pdata;
    > + keypad->input_dev = input_dev;
    > + keypad->irq = irq;
    > +
    > + 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");
    > + error = -EBUSY;
    > + goto failed_free;
    > + }
    > +
    > + 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 = -ENXIO;
    > + goto failed_free_mem;
    > + }
    > +
    > + keypad->clk = clk_get(NULL, "kpp");
    > + if (IS_ERR(keypad->clk)) {
    > + dev_err(&pdev->dev, "failed to get keypad clock\n");
    > + error = PTR_ERR(keypad->clk);
    > + goto failed_free_io;
    > + }
    > +
    > + input_dev->name = pdev->name;
    > + input_dev->id.bustype = BUS_HOST;
    > + input_dev->open = mxc_keypad_open;
    > + input_dev->close = mxc_keypad_close;
    > + input_dev->dev.parent = &pdev->dev;
    > +
    > + input_dev->keycode = keypad->keycodes;
    > + input_dev->keycodesize = sizeof(keypad->keycodes[0]);
    > + input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
    > +
    > + input_set_drvdata(input_dev, keypad);
    > +
    > + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
    > + input_set_capability(input_dev, EV_MSC, MSC_SCAN);
    > +
    > + mxc_keypad_build_keycode(keypad);
    > +
    > + error = request_threaded_irq(irq, mxc_keypad_irq_handler,
    > + mxc_keypad_irq_handler_thread, IRQF_DISABLED,
    > + pdev->name, keypad);
    > + if (error) {
    > + dev_err(&pdev->dev, "failed to request IRQ\n");
    > + goto failed_put_clk;
    > + }
    > +
    > + /* 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);
    > +
    > + dev_info(&pdev->dev, "device probed.\n");
    > +
    > + return 0;
    > +
    > +failed_free_irq:
    > + free_irq(irq, pdev);
    > +failed_put_clk:
    > + clk_put(keypad->clk);
    > +failed_free_io:
    > + iounmap(keypad->mmio_base);
    > +failed_free_mem:
    > + release_mem_region(res->start, resource_size(res));
    > +failed_free:
    > + input_free_device(input_dev);
    > + kfree(keypad);
    > + return error;
    > +}
    > +
    > +static int __devexit mxc_keypad_remove(struct platform_device *pdev)
    > +{
    > + struct mxc_keypad *keypad = platform_get_drvdata(pdev);
    > + struct resource *res;
    > +
    > + free_irq(keypad->irq, keypad);

    You might want to move the platform_set_drvdata(pdev, NULL) to prevent
    any race conditions.

    > + clk_put(keypad->clk);
    > +
    > + input_unregister_device(keypad->input_dev);
    > + input_free_device(keypad->input_dev);

    input_free_device is unnecessary for already registered devices.

    > +
    > + iounmap(keypad->mmio_base);
    > +
    > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    > + release_mem_region(res->start, resource_size(res));
    > +
    > + platform_set_drvdata(pdev, NULL);
    > + kfree(keypad);
    > +
    > + return 0;
    > +}
    > +
    > +static struct platform_driver mxc_keypad_driver = {
    > + .driver = {
    > + .name = "mxc-keypad",
    > + .owner = THIS_MODULE,
    > + },
    > + .probe = mxc_keypad_probe,
    > + .remove = __devexit_p(mxc_keypad_remove),
    > +};
    > +
    > +static int __init mxc_keypad_init(void)
    > +{
    > + return platform_driver_register(&mxc_keypad_driver);
    > +}
    > +
    > +static void __exit mxc_keypad_exit(void)
    > +{
    > + platform_driver_unregister(&mxc_keypad_driver);
    > +}
    > +
    > +module_init(mxc_keypad_init);
    > +module_exit(mxc_keypad_exit);
    > +
    > +MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
    > +MODULE_DESCRIPTION("MXC Keypad Port Driver");
    > +MODULE_LICENSE("GPL v2");
    > +MODULE_ALIAS("platform:mxc-keypad");
    \
     
     \ /
      Last update: 2010-01-08 21:35    [W:0.071 / U:32.568 seconds]
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