Input: add matrix keypad driver for Cirrus EP93xx
This is a keyboard driver for the Cirrus Logic EP93xx keypad matrix peripheral. This driver is based on the pxa27x_keypad driver. [dtor@mail.ru: Plug in input_dev->keycode so keymap can be changed from userspace.] Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
H Hartley Sweeten
Dmitry Torokhov
parent
864fe73c31
commit
e06003af56
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@ -0,0 +1,42 @@
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/*
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* arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h
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*/
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#ifndef __ASM_ARCH_EP93XX_KEYPAD_H
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#define __ASM_ARCH_EP93XX_KEYPAD_H
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#define MAX_MATRIX_KEY_ROWS (8)
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#define MAX_MATRIX_KEY_COLS (8)
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/* flags for the ep93xx_keypad driver */
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#define EP93XX_KEYPAD_DISABLE_3_KEY (1<<0) /* disable 3-key reset */
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#define EP93XX_KEYPAD_DIAG_MODE (1<<1) /* diagnostic mode */
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#define EP93XX_KEYPAD_BACK_DRIVE (1<<2) /* back driving mode */
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#define EP93XX_KEYPAD_TEST_MODE (1<<3) /* scan only column 0 */
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#define EP93XX_KEYPAD_KDIV (1<<4) /* 1/4 clock or 1/16 clock */
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#define EP93XX_KEYPAD_AUTOREPEAT (1<<5) /* enable key autorepeat */
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/**
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* struct ep93xx_keypad_platform_data - platform specific device structure
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* @matrix_key_rows: number of rows in the keypad matrix
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* @matrix_key_cols: number of columns in the keypad matrix
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* @matrix_key_map: array of keycodes defining the keypad matrix
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* @matrix_key_map_size: ARRAY_SIZE(matrix_key_map)
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* @debounce: debounce start count; terminal count is 0xff
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* @prescale: row/column counter pre-scaler load value
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* @flags: see above
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*/
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struct ep93xx_keypad_platform_data {
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unsigned int matrix_key_rows;
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unsigned int matrix_key_cols;
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unsigned int *matrix_key_map;
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int matrix_key_map_size;
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unsigned int debounce;
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unsigned int prescale;
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unsigned int flags;
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};
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/* macro for creating the matrix_key_map table */
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#define KEY(row, col, val) (((row) << 28) | ((col) << 24) | (val))
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#endif /* __ASM_ARCH_EP93XX_KEYPAD_H */
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@ -332,4 +332,14 @@ config KEYBOARD_SH_KEYSC
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To compile this driver as a module, choose M here: the
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module will be called sh_keysc.
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+
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config KEYBOARD_EP93XX
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tristate "EP93xx Matrix Keypad support"
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depends on ARCH_EP93XX
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help
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Say Y here to enable the matrix keypad on the Cirrus EP93XX.
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To compile this driver as a module, choose M here: the
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module will be called ep93xx_keypad.
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endif
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@ -28,3 +28,4 @@ obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o
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obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
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obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
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obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
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obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
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@ -0,0 +1,470 @@
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/*
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* Driver for the Cirrus EP93xx matrix keypad controller.
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*
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* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* NOTE:
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*
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* The 3-key reset is triggered by pressing the 3 keys in
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* Row 0, Columns 2, 4, and 7 at the same time. This action can
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* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
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*
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* Normal operation for the matrix does not autorepeat the key press.
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* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
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* flag.
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*/
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/clk.h>
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#include <mach/hardware.h>
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#include <mach/gpio.h>
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#include <mach/ep93xx_keypad.h>
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/*
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* Keypad Interface Register offsets
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*/
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#define KEY_INIT 0x00 /* Key Scan Initialization register */
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#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
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#define KEY_REG 0x08 /* Key Value Capture register */
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/* Key Scan Initialization Register bit defines */
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#define KEY_INIT_DBNC_MASK (0x00ff0000)
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#define KEY_INIT_DBNC_SHIFT (16)
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#define KEY_INIT_DIS3KY (1<<15)
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#define KEY_INIT_DIAG (1<<14)
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#define KEY_INIT_BACK (1<<13)
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#define KEY_INIT_T2 (1<<12)
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#define KEY_INIT_PRSCL_MASK (0x000003ff)
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#define KEY_INIT_PRSCL_SHIFT (0)
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/* Key Scan Diagnostic Register bit defines */
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#define KEY_DIAG_MASK (0x0000003f)
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#define KEY_DIAG_SHIFT (0)
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/* Key Value Capture Register bit defines */
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#define KEY_REG_K (1<<15)
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#define KEY_REG_INT (1<<14)
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#define KEY_REG_2KEYS (1<<13)
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#define KEY_REG_1KEY (1<<12)
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#define KEY_REG_KEY2_MASK (0x00000fc0)
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#define KEY_REG_KEY2_SHIFT (6)
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#define KEY_REG_KEY1_MASK (0x0000003f)
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#define KEY_REG_KEY1_SHIFT (0)
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#define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
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#define keypad_writel(v, off) __raw_writel((v), keypad->mmio_base + (off))
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#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
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struct ep93xx_keypad {
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struct ep93xx_keypad_platform_data *pdata;
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struct clk *clk;
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struct input_dev *input_dev;
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void __iomem *mmio_base;
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int irq;
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int enabled;
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int key1;
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int key2;
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unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
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};
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static void ep93xx_keypad_build_keycode(struct ep93xx_keypad *keypad)
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{
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struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
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struct input_dev *input_dev = keypad->input_dev;
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int i;
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for (i = 0; i < pdata->matrix_key_map_size; i++) {
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unsigned int key = pdata->matrix_key_map[i];
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int row = (key >> 28) & 0xf;
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int col = (key >> 24) & 0xf;
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int code = key & 0xffffff;
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keypad->matrix_keycodes[(row << 3) + col] = code;
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__set_bit(code, input_dev->keybit);
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}
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}
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static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
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{
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struct ep93xx_keypad *keypad = dev_id;
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struct input_dev *input_dev = keypad->input_dev;
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unsigned int status = keypad_readl(KEY_REG);
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int keycode, key1, key2;
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keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
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key1 = keypad->matrix_keycodes[keycode];
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keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
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key2 = keypad->matrix_keycodes[keycode];
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if (status & KEY_REG_2KEYS) {
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if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
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input_report_key(input_dev, keypad->key1, 0);
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if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
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input_report_key(input_dev, keypad->key2, 0);
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input_report_key(input_dev, key1, 1);
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input_report_key(input_dev, key2, 1);
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keypad->key1 = key1;
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keypad->key2 = key2;
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} else if (status & KEY_REG_1KEY) {
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if (keypad->key1 && key1 != keypad->key1)
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input_report_key(input_dev, keypad->key1, 0);
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if (keypad->key2 && key1 != keypad->key2)
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input_report_key(input_dev, keypad->key2, 0);
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input_report_key(input_dev, key1, 1);
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keypad->key1 = key1;
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keypad->key2 = 0;
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} else {
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input_report_key(input_dev, keypad->key1, 0);
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input_report_key(input_dev, keypad->key2, 0);
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keypad->key1 = keypad->key2 = 0;
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}
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input_sync(input_dev);
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return IRQ_HANDLED;
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}
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static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
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{
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struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
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unsigned int val = 0;
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clk_set_rate(keypad->clk, pdata->flags & EP93XX_KEYPAD_KDIV);
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if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
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val |= KEY_INIT_DIS3KY;
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if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
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val |= KEY_INIT_DIAG;
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if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
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val |= KEY_INIT_BACK;
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if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
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val |= KEY_INIT_T2;
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val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
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val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
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keypad_writel(val, KEY_INIT);
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}
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static int ep93xx_keypad_open(struct input_dev *pdev)
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{
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struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
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if (!keypad->enabled) {
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ep93xx_keypad_config(keypad);
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clk_enable(keypad->clk);
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keypad->enabled = 1;
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}
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return 0;
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}
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static void ep93xx_keypad_close(struct input_dev *pdev)
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{
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struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
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if (keypad->enabled) {
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clk_disable(keypad->clk);
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keypad->enabled = 0;
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}
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}
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#ifdef CONFIG_PM
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/*
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* NOTE: I don't know if this is correct, or will work on the ep93xx.
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*
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* None of the existing ep93xx drivers have power management support.
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* But, this is basically what the pxa27x_keypad driver does.
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*/
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static int ep93xx_keypad_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
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struct input_dev *input_dev = keypad->input_dev;
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mutex_lock(&input_dev->mutex);
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if (keypad->enabled) {
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clk_disable(keypad->clk);
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keypad->enabled = 0;
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}
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mutex_unlock(&input_dev->mutex);
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(keypad->irq);
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return 0;
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}
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static int ep93xx_keypad_resume(struct platform_device *pdev)
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{
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struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
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struct input_dev *input_dev = keypad->input_dev;
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(keypad->irq);
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mutex_lock(&input_dev->mutex);
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if (input_dev->users) {
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if (!keypad->enabled) {
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ep93xx_keypad_config(keypad);
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clk_enable(keypad->clk);
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keypad->enabled = 1;
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}
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}
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mutex_unlock(&input_dev->mutex);
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return 0;
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}
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#else /* !CONFIG_PM */
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#define ep93xx_keypad_suspend NULL
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#define ep93xx_keypad_resume NULL
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#endif /* !CONFIG_PM */
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static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
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{
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struct ep93xx_keypad *keypad;
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struct ep93xx_keypad_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input_dev;
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struct resource *res;
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int irq, err, i, gpio;
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if (!pdata ||
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!pdata->matrix_key_rows ||
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pdata->matrix_key_rows > MAX_MATRIX_KEY_ROWS ||
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!pdata->matrix_key_cols ||
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pdata->matrix_key_cols > MAX_MATRIX_KEY_COLS) {
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dev_err(&pdev->dev, "invalid or missing platform data\n");
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return -EINVAL;
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}
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keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
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if (!keypad) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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return -ENOMEM;
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}
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keypad->pdata = pdata;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "failed to get keypad irq\n");
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err = -ENXIO;
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goto failed_free;
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}
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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, "failed to get I/O memory\n");
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err = -ENXIO;
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goto failed_free;
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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, "failed to request I/O memory\n");
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err = -EBUSY;
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goto failed_free;
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}
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keypad->mmio_base = ioremap(res->start, resource_size(res));
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if (keypad->mmio_base == NULL) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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err = -ENXIO;
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goto failed_free_mem;
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}
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/* Request the needed GPIO's */
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gpio = EP93XX_GPIO_LINE_ROW0;
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for (i = 0; i < keypad->pdata->matrix_key_rows; i++, gpio++) {
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err = gpio_request(gpio, pdev->name);
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if (err) {
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dev_err(&pdev->dev, "failed to request gpio-%d\n",
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gpio);
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goto failed_free_rows;
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}
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}
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gpio = EP93XX_GPIO_LINE_COL0;
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for (i = 0; i < keypad->pdata->matrix_key_cols; i++, gpio++) {
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err = gpio_request(gpio, pdev->name);
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if (err) {
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dev_err(&pdev->dev, "failed to request gpio-%d\n",
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gpio);
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goto failed_free_cols;
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}
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}
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keypad->clk = clk_get(&pdev->dev, "key_clk");
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if (IS_ERR(keypad->clk)) {
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dev_err(&pdev->dev, "failed to get keypad clock\n");
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err = PTR_ERR(keypad->clk);
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goto failed_free_io;
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}
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/* Create and register the input driver */
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input_dev = input_allocate_device();
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if (!input_dev) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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err = -ENOMEM;
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goto failed_put_clk;
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}
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keypad->input_dev = input_dev;
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input_dev->name = pdev->name;
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input_dev->id.bustype = BUS_HOST;
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input_dev->open = ep93xx_keypad_open;
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input_dev->close = ep93xx_keypad_close;
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input_dev->dev.parent = &pdev->dev;
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input_dev->keycode = keypad->matrix_keycodes;
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input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]);
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input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes);
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input_set_drvdata(input_dev, keypad);
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input_dev->evbit[0] = BIT_MASK(EV_KEY);
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if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
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input_dev->evbit[0] |= BIT_MASK(EV_REP);
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ep93xx_keypad_build_keycode(keypad);
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platform_set_drvdata(pdev, keypad);
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err = request_irq(irq, ep93xx_keypad_irq_handler, IRQF_DISABLED,
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pdev->name, keypad);
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if (err) {
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dev_err(&pdev->dev, "failed to request IRQ\n");
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goto failed_free_dev;
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}
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keypad->irq = irq;
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/* Register the input device */
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err = input_register_device(input_dev);
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if (err) {
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dev_err(&pdev->dev, "failed to register input device\n");
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goto failed_free_irq;
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}
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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failed_free_irq:
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free_irq(irq, pdev);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
failed_free_dev:
|
||||
input_free_device(input_dev);
|
||||
failed_put_clk:
|
||||
clk_put(keypad->clk);
|
||||
failed_free_io:
|
||||
i = keypad->pdata->matrix_key_cols - 1;
|
||||
gpio = EP93XX_GPIO_LINE_COL0 + i;
|
||||
failed_free_cols:
|
||||
for ( ; i >= 0; i--, gpio--)
|
||||
gpio_free(gpio);
|
||||
i = keypad->pdata->matrix_key_rows - 1;
|
||||
gpio = EP93XX_GPIO_LINE_ROW0 + i;
|
||||
failed_free_rows:
|
||||
for ( ; i >= 0; i--, gpio--)
|
||||
gpio_free(gpio);
|
||||
iounmap(keypad->mmio_base);
|
||||
failed_free_mem:
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
failed_free:
|
||||
kfree(keypad);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit ep93xx_keypad_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
|
||||
struct resource *res;
|
||||
int i, gpio;
|
||||
|
||||
free_irq(keypad->irq, pdev);
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
if (keypad->enabled)
|
||||
clk_disable(keypad->clk);
|
||||
clk_put(keypad->clk);
|
||||
|
||||
input_unregister_device(keypad->input_dev);
|
||||
|
||||
i = keypad->pdata->matrix_key_cols - 1;
|
||||
gpio = EP93XX_GPIO_LINE_COL0 + i;
|
||||
for ( ; i >= 0; i--, gpio--)
|
||||
gpio_free(gpio);
|
||||
|
||||
i = keypad->pdata->matrix_key_rows - 1;
|
||||
gpio = EP93XX_GPIO_LINE_ROW0 + i;
|
||||
for ( ; i >= 0; i--, gpio--)
|
||||
gpio_free(gpio);
|
||||
|
||||
iounmap(keypad->mmio_base);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
|
||||
kfree(keypad);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver ep93xx_keypad_driver = {
|
||||
.driver = {
|
||||
.name = "ep93xx-keypad",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ep93xx_keypad_probe,
|
||||
.remove = __devexit_p(ep93xx_keypad_remove),
|
||||
.suspend = ep93xx_keypad_suspend,
|
||||
.resume = ep93xx_keypad_resume,
|
||||
};
|
||||
|
||||
static int __init ep93xx_keypad_init(void)
|
||||
{
|
||||
return platform_driver_register(&ep93xx_keypad_driver);
|
||||
}
|
||||
|
||||
static void __exit ep93xx_keypad_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&ep93xx_keypad_driver);
|
||||
}
|
||||
|
||||
module_init(ep93xx_keypad_init);
|
||||
module_exit(ep93xx_keypad_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
|
||||
MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
|
||||
MODULE_ALIAS("platform:ep93xx-keypad");
|
||||
Loading…
Reference in New Issue