Input: add support for Blackfin BF54x Keypad controller
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Michael Hennerich
Dmitry Torokhov
parent
937ad5c1e3
commit
8f740ef391
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@ -88,7 +88,7 @@ static struct platform_device bf54x_lq043_device = {
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#endif
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#if defined(CONFIG_KEYBOARD_BFIN) || defined(CONFIG_KEYBOARD_BFIN_MODULE)
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static int bf548_keymap[] = {
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static const unsigned int bf548_keymap[] = {
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KEYVAL(0, 0, KEY_ENTER),
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KEYVAL(0, 1, KEY_HELP),
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KEYVAL(0, 2, KEY_0),
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@ -284,4 +284,13 @@ config KEYBOARD_MAPLE
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To compile this driver as a module, choose M here: the
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module will be called maple_keyb.
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config KEYBOARD_BFIN
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tristate "Blackfin BF54x keypad support"
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depends on BF54x
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help
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Say Y here if you want to use the BF54x keypad.
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To compile this driver as a module, choose M here: the
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module will be called bf54x-keys.
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endif
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@ -24,4 +24,4 @@ obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
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obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o
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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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@ -0,0 +1,382 @@
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/*
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* File: drivers/input/keyboard/bf54x-keys.c
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* Based on:
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* Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
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*
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* Created:
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* Description: keypad driver for Analog Devices Blackfin BF54x Processors
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*
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*
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* Modified:
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* Copyright 2007 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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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, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <asm/portmux.h>
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#include <asm/mach/bf54x_keys.h>
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#define DRV_NAME "bf54x-keys"
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#define TIME_SCALE 100 /* 100 ns */
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#define MAX_MULT (0xFF * TIME_SCALE)
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#define MAX_RC 8 /* Max Row/Col */
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static const u16 per_rows[] = {
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P_KEY_ROW7,
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P_KEY_ROW6,
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P_KEY_ROW5,
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P_KEY_ROW4,
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P_KEY_ROW3,
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P_KEY_ROW2,
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P_KEY_ROW1,
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P_KEY_ROW0,
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0
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};
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static const u16 per_cols[] = {
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P_KEY_COL7,
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P_KEY_COL6,
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P_KEY_COL5,
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P_KEY_COL4,
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P_KEY_COL3,
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P_KEY_COL2,
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P_KEY_COL1,
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P_KEY_COL0,
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0
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};
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struct bf54x_kpad {
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struct input_dev *input;
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int irq;
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unsigned short lastkey;
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unsigned short *keycode;
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struct timer_list timer;
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unsigned int keyup_test_jiffies;
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};
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static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
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struct input_dev *input, u16 keyident)
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{
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u16 i;
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for (i = 0; i < input->keycodemax; i++)
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if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
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return bf54x_kpad->keycode[i];
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return -1;
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}
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static inline void bfin_keycodecpy(unsigned short *keycode,
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const unsigned int *pdata_kc,
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unsigned short keymapsize)
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{
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unsigned int i;
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for (i = 0; i < keymapsize; i++) {
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keycode[i] = pdata_kc[i] & 0xffff;
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keycode[i + keymapsize] = pdata_kc[i] >> 16;
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}
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}
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static inline u16 bfin_kpad_get_prescale(u32 timescale)
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{
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u32 sclk = get_sclk();
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return ((((sclk / 1000) * timescale) / 1024) - 1);
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}
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static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
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{
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return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
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}
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static inline void bfin_kpad_clear_irq(void)
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{
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bfin_write_KPAD_STAT(0xFFFF);
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bfin_write_KPAD_ROWCOL(0xFFFF);
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}
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static void bfin_kpad_timer(unsigned long data)
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{
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struct platform_device *pdev = (struct platform_device *) data;
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struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
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if (bfin_kpad_get_keypressed(bf54x_kpad)) {
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/* Try again later */
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mod_timer(&bf54x_kpad->timer,
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jiffies + bf54x_kpad->keyup_test_jiffies);
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return;
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}
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input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
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input_sync(bf54x_kpad->input);
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/* Clear IRQ Status */
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bfin_kpad_clear_irq();
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enable_irq(bf54x_kpad->irq);
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}
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static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
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struct input_dev *input = bf54x_kpad->input;
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int key;
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u16 rowcol = bfin_read_KPAD_ROWCOL();
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key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);
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input_report_key(input, key, 1);
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input_sync(input);
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if (bfin_kpad_get_keypressed(bf54x_kpad)) {
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disable_irq(bf54x_kpad->irq);
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bf54x_kpad->lastkey = key;
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mod_timer(&bf54x_kpad->timer,
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jiffies + bf54x_kpad->keyup_test_jiffies);
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} else {
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input_report_key(input, key, 0);
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input_sync(input);
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bfin_kpad_clear_irq();
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}
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return IRQ_HANDLED;
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}
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static int __devinit bfin_kpad_probe(struct platform_device *pdev)
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{
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struct bf54x_kpad *bf54x_kpad;
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struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input;
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int i, error;
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if (!pdata->rows || !pdata->cols || !pdata->keymap) {
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printk(KERN_ERR DRV_NAME
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": No rows, cols or keymap from pdata\n");
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return -EINVAL;
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}
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if (!pdata->keymapsize ||
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pdata->keymapsize > (pdata->rows * pdata->cols)) {
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printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
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return -EINVAL;
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}
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bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
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if (!bf54x_kpad)
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return -ENOMEM;
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platform_set_drvdata(pdev, bf54x_kpad);
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/* Allocate memory for keymap followed by private LUT */
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bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
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sizeof(unsigned short) * 2, GFP_KERNEL);
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if (!bf54x_kpad->keycode) {
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error = -ENOMEM;
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goto out;
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}
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if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT ||
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!pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) {
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printk(KERN_ERR DRV_NAME
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": Invalid Debounce/Columdrive Time from pdata\n");
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bfin_write_KPAD_MSEL(0xFF0); /* Default MSEL */
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} else {
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bfin_write_KPAD_MSEL(
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((pdata->debounce_time / TIME_SCALE)
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& DBON_SCALE) |
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(((pdata->coldrive_time / TIME_SCALE) << 8)
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& COLDRV_SCALE));
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}
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if (!pdata->keyup_test_interval)
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bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
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else
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bf54x_kpad->keyup_test_jiffies =
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msecs_to_jiffies(pdata->keyup_test_interval);
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if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
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DRV_NAME)) {
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printk(KERN_ERR DRV_NAME
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": Requesting Peripherals failed\n");
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error = -EFAULT;
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goto out0;
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}
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if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
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DRV_NAME)) {
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printk(KERN_ERR DRV_NAME
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": Requesting Peripherals failed\n");
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error = -EFAULT;
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goto out1;
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}
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bf54x_kpad->irq = platform_get_irq(pdev, 0);
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if (bf54x_kpad->irq < 0) {
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error = -ENODEV;
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goto out2;
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}
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error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
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IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
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if (error) {
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printk(KERN_ERR DRV_NAME
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": unable to claim irq %d; error %d\n",
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bf54x_kpad->irq, error);
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error = -EBUSY;
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goto out2;
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}
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input = input_allocate_device();
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if (!input) {
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error = -ENOMEM;
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goto out3;
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}
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bf54x_kpad->input = input;
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input->name = pdev->name;
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input->phys = "bf54x-keys/input0";
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input->dev.parent = &pdev->dev;
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input_set_drvdata(input, bf54x_kpad);
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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input->keycodesize = sizeof(unsigned short);
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input->keycodemax = pdata->keymapsize;
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input->keycode = bf54x_kpad->keycode;
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bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
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/* setup input device */
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__set_bit(EV_KEY, input->evbit);
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if (pdata->repeat)
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__set_bit(EV_REP, input->evbit);
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for (i = 0; i < input->keycodemax; i++)
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__set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
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__clear_bit(KEY_RESERVED, input->keybit);
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error = input_register_device(input);
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if (error) {
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printk(KERN_ERR DRV_NAME
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": Unable to register input device (%d)\n", error);
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goto out4;
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}
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/* Init Keypad Key Up/Release test timer */
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setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
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bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
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bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
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(((pdata->rows - 1) << 10) & KPAD_ROWEN) |
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(2 & KPAD_IRQMODE));
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bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
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printk(KERN_ERR DRV_NAME
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": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);
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return 0;
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out4:
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input_free_device(input);
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out3:
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free_irq(bf54x_kpad->irq, pdev);
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out2:
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peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
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out1:
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peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
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out0:
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kfree(bf54x_kpad->keycode);
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out:
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kfree(bf54x_kpad);
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platform_set_drvdata(pdev, NULL);
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return error;
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}
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static int __devexit bfin_kpad_remove(struct platform_device *pdev)
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{
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struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
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struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
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del_timer_sync(&bf54x_kpad->timer);
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free_irq(bf54x_kpad->irq, pdev);
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input_unregister_device(bf54x_kpad->input);
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peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
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peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
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kfree(bf54x_kpad->keycode);
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kfree(bf54x_kpad);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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struct platform_driver bfin_kpad_device_driver = {
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.probe = bfin_kpad_probe,
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.remove = __devexit_p(bfin_kpad_remove),
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.driver = {
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.name = DRV_NAME,
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}
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};
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static int __init bfin_kpad_init(void)
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{
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return platform_driver_register(&bfin_kpad_device_driver);
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}
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static void __exit bfin_kpad_exit(void)
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{
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platform_driver_unregister(&bfin_kpad_device_driver);
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}
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module_init(bfin_kpad_init);
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module_exit(bfin_kpad_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
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@ -0,0 +1,17 @@
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#ifndef _BFIN_KPAD_H
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#define _BFIN_KPAD_H
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struct bfin_kpad_platform_data {
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int rows;
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int cols;
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const unsigned int *keymap;
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unsigned short keymapsize;
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unsigned short repeat;
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u32 debounce_time; /* in ns */
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u32 coldrive_time; /* in ns */
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u32 keyup_test_interval; /* in ms */
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};
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#define KEYVAL(col, row, val) (((1 << col) << 24) | ((1 << row) << 16) | (val))
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#endif
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