forked from Minki/linux
4384041533
We now have a binding which adds two parameters to the matrix keypad DT node. This is separate from the GPIO-driven matrix keypad binding, and unfortunately incompatible, since that uses row-gpios/col-gpios for the row and column counts. So the easiest option here is to provide a function for non-GPIO drivers to use to decode the binding. Note: We could in fact create an entirely separate structure to hold these two fields, but it does not seem worth it, yet. If we have more parameters then we can add this, and then refactor each driver to hold such a structure. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> (v2) Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
450 lines
12 KiB
C
450 lines
12 KiB
C
/*
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* OMAP4 Keypad Driver
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*
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* Copyright (C) 2010 Texas Instruments
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*
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* Author: Abraham Arce <x0066660@ti.com>
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* Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_data/omap4-keypad.h>
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/* OMAP4 registers */
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#define OMAP4_KBD_REVISION 0x00
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#define OMAP4_KBD_SYSCONFIG 0x10
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#define OMAP4_KBD_SYSSTATUS 0x14
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#define OMAP4_KBD_IRQSTATUS 0x18
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#define OMAP4_KBD_IRQENABLE 0x1C
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#define OMAP4_KBD_WAKEUPENABLE 0x20
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#define OMAP4_KBD_PENDING 0x24
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#define OMAP4_KBD_CTRL 0x28
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#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
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#define OMAP4_KBD_LONGKEYTIME 0x30
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#define OMAP4_KBD_TIMEOUT 0x34
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#define OMAP4_KBD_STATEMACHINE 0x38
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#define OMAP4_KBD_ROWINPUTS 0x3C
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#define OMAP4_KBD_COLUMNOUTPUTS 0x40
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#define OMAP4_KBD_FULLCODE31_0 0x44
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#define OMAP4_KBD_FULLCODE63_32 0x48
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/* OMAP4 bit definitions */
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#define OMAP4_DEF_IRQENABLE_EVENTEN (1 << 0)
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#define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1)
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#define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2)
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#define OMAP4_DEF_WUP_EVENT_ENA (1 << 0)
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#define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1)
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#define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1)
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#define OMAP4_DEF_CTRLPTVVALUE (1 << 2)
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#define OMAP4_DEF_CTRLPTV (1 << 1)
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/* OMAP4 values */
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#define OMAP4_VAL_IRQDISABLE 0x00
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#define OMAP4_VAL_DEBOUNCINGTIME 0x07
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#define OMAP4_VAL_FUNCTIONALCFG 0x1E
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#define OMAP4_MASK_IRQSTATUSDISABLE 0xFFFF
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enum {
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KBD_REVISION_OMAP4 = 0,
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KBD_REVISION_OMAP5,
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};
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struct omap4_keypad {
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struct input_dev *input;
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void __iomem *base;
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unsigned int irq;
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unsigned int rows;
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unsigned int cols;
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u32 reg_offset;
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u32 irqreg_offset;
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unsigned int row_shift;
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bool no_autorepeat;
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unsigned char key_state[8];
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unsigned short *keymap;
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};
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static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
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{
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return __raw_readl(keypad_data->base +
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keypad_data->reg_offset + offset);
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}
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static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
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{
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__raw_writel(value,
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keypad_data->base + keypad_data->reg_offset + offset);
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}
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static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
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{
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return __raw_readl(keypad_data->base +
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keypad_data->irqreg_offset + offset);
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}
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static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
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u32 offset, u32 value)
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{
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__raw_writel(value,
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keypad_data->base + keypad_data->irqreg_offset + offset);
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}
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/* Interrupt handler */
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static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
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{
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struct omap4_keypad *keypad_data = dev_id;
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struct input_dev *input_dev = keypad_data->input;
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unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
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unsigned int col, row, code, changed;
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u32 *new_state = (u32 *) key_state;
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/* Disable interrupts */
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
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OMAP4_VAL_IRQDISABLE);
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*new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
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*(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
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for (row = 0; row < keypad_data->rows; row++) {
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changed = key_state[row] ^ keypad_data->key_state[row];
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if (!changed)
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continue;
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for (col = 0; col < keypad_data->cols; col++) {
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if (changed & (1 << col)) {
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code = MATRIX_SCAN_CODE(row, col,
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keypad_data->row_shift);
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev,
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keypad_data->keymap[code],
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key_state[row] & (1 << col));
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}
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}
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}
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input_sync(input_dev);
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memcpy(keypad_data->key_state, key_state,
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sizeof(keypad_data->key_state));
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/* clear pending interrupts */
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
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kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
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/* enable interrupts */
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
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OMAP4_DEF_IRQENABLE_EVENTEN |
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OMAP4_DEF_IRQENABLE_LONGKEY);
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return IRQ_HANDLED;
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}
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static int omap4_keypad_open(struct input_dev *input)
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{
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struct omap4_keypad *keypad_data = input_get_drvdata(input);
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pm_runtime_get_sync(input->dev.parent);
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disable_irq(keypad_data->irq);
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kbd_writel(keypad_data, OMAP4_KBD_CTRL,
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OMAP4_VAL_FUNCTIONALCFG);
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kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
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OMAP4_VAL_DEBOUNCINGTIME);
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
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OMAP4_VAL_IRQDISABLE);
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
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OMAP4_DEF_IRQENABLE_EVENTEN |
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OMAP4_DEF_IRQENABLE_LONGKEY);
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kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
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OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
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enable_irq(keypad_data->irq);
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return 0;
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}
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static void omap4_keypad_close(struct input_dev *input)
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{
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struct omap4_keypad *keypad_data = input_get_drvdata(input);
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disable_irq(keypad_data->irq);
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/* Disable interrupts */
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
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OMAP4_VAL_IRQDISABLE);
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/* clear pending interrupts */
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
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kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
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enable_irq(keypad_data->irq);
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pm_runtime_put_sync(input->dev.parent);
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}
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#ifdef CONFIG_OF
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static int omap4_keypad_parse_dt(struct device *dev,
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struct omap4_keypad *keypad_data)
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{
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struct device_node *np = dev->of_node;
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int err;
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err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
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&keypad_data->cols);
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if (err)
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return err;
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if (of_get_property(np, "linux,input-no-autorepeat", NULL))
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keypad_data->no_autorepeat = true;
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return 0;
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}
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#else
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static inline int omap4_keypad_parse_dt(struct device *dev,
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struct omap4_keypad *keypad_data)
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{
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return -ENOSYS;
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}
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#endif
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static int omap4_keypad_probe(struct platform_device *pdev)
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{
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const struct omap4_keypad_platform_data *pdata =
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dev_get_platdata(&pdev->dev);
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const struct matrix_keymap_data *keymap_data =
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pdata ? pdata->keymap_data : NULL;
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struct omap4_keypad *keypad_data;
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struct input_dev *input_dev;
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struct resource *res;
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unsigned int max_keys;
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int rev;
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int irq;
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int error;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "no base address specified\n");
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return -EINVAL;
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}
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irq = platform_get_irq(pdev, 0);
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if (!irq) {
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dev_err(&pdev->dev, "no keyboard irq assigned\n");
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return -EINVAL;
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}
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keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
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if (!keypad_data) {
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dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
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return -ENOMEM;
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}
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keypad_data->irq = irq;
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if (pdata) {
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keypad_data->rows = pdata->rows;
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keypad_data->cols = pdata->cols;
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} else {
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error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
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if (error)
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return error;
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}
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res = request_mem_region(res->start, resource_size(res), pdev->name);
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if (!res) {
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dev_err(&pdev->dev, "can't request mem region\n");
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error = -EBUSY;
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goto err_free_keypad;
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}
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keypad_data->base = ioremap(res->start, resource_size(res));
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if (!keypad_data->base) {
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dev_err(&pdev->dev, "can't ioremap mem resource\n");
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error = -ENOMEM;
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goto err_release_mem;
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}
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/*
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* Enable clocks for the keypad module so that we can read
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* revision register.
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*/
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pm_runtime_enable(&pdev->dev);
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error = pm_runtime_get_sync(&pdev->dev);
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if (error) {
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dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
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goto err_unmap;
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}
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rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
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rev &= 0x03 << 30;
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rev >>= 30;
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switch (rev) {
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case KBD_REVISION_OMAP4:
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keypad_data->reg_offset = 0x00;
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keypad_data->irqreg_offset = 0x00;
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break;
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case KBD_REVISION_OMAP5:
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keypad_data->reg_offset = 0x10;
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keypad_data->irqreg_offset = 0x0c;
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break;
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default:
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dev_err(&pdev->dev,
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"Keypad reports unsupported revision %d", rev);
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error = -EINVAL;
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goto err_pm_put_sync;
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}
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/* input device allocation */
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keypad_data->input = input_dev = input_allocate_device();
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if (!input_dev) {
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error = -ENOMEM;
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goto err_pm_put_sync;
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}
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input_dev->name = pdev->name;
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input_dev->dev.parent = &pdev->dev;
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x0001;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0001;
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input_dev->open = omap4_keypad_open;
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input_dev->close = omap4_keypad_close;
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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if (!keypad_data->no_autorepeat)
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__set_bit(EV_REP, input_dev->evbit);
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input_set_drvdata(input_dev, keypad_data);
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keypad_data->row_shift = get_count_order(keypad_data->cols);
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max_keys = keypad_data->rows << keypad_data->row_shift;
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keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
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GFP_KERNEL);
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if (!keypad_data->keymap) {
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dev_err(&pdev->dev, "Not enough memory for keymap\n");
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error = -ENOMEM;
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goto err_free_input;
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}
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error = matrix_keypad_build_keymap(keymap_data, NULL,
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keypad_data->rows, keypad_data->cols,
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keypad_data->keymap, input_dev);
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if (error) {
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dev_err(&pdev->dev, "failed to build keymap\n");
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goto err_free_keymap;
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}
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error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
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IRQF_TRIGGER_RISING,
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"omap4-keypad", keypad_data);
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if (error) {
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dev_err(&pdev->dev, "failed to register interrupt\n");
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goto err_free_input;
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}
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pm_runtime_put_sync(&pdev->dev);
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error = input_register_device(keypad_data->input);
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if (error < 0) {
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dev_err(&pdev->dev, "failed to register input device\n");
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goto err_pm_disable;
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}
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platform_set_drvdata(pdev, keypad_data);
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return 0;
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err_pm_disable:
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pm_runtime_disable(&pdev->dev);
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free_irq(keypad_data->irq, keypad_data);
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err_free_keymap:
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kfree(keypad_data->keymap);
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err_free_input:
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input_free_device(input_dev);
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err_pm_put_sync:
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pm_runtime_put_sync(&pdev->dev);
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err_unmap:
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iounmap(keypad_data->base);
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err_release_mem:
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release_mem_region(res->start, resource_size(res));
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err_free_keypad:
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kfree(keypad_data);
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return error;
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}
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static int omap4_keypad_remove(struct platform_device *pdev)
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{
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struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
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struct resource *res;
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free_irq(keypad_data->irq, keypad_data);
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pm_runtime_disable(&pdev->dev);
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input_unregister_device(keypad_data->input);
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iounmap(keypad_data->base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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kfree(keypad_data->keymap);
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kfree(keypad_data);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id omap_keypad_dt_match[] = {
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{ .compatible = "ti,omap4-keypad" },
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{},
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};
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MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
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#endif
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static struct platform_driver omap4_keypad_driver = {
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.probe = omap4_keypad_probe,
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.remove = omap4_keypad_remove,
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.driver = {
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.name = "omap4-keypad",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(omap_keypad_dt_match),
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},
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};
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module_platform_driver(omap4_keypad_driver);
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MODULE_AUTHOR("Texas Instruments");
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MODULE_DESCRIPTION("OMAP4 Keypad Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:omap4-keypad");
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