![Abraham Arce](/assets/img/avatar_default.png)
Enable Runtime PM functionality in OMAP4 driver based on the following assumptions: - keyboard controller in wakeup domain so it is always on and power impact is minimal; - in OMAP4 the device control is at module/device level and ick/fclk level control is difficult so cutting of clocks will prevent interrupts. Signed-off-by: Abraham Arce <x0066660@ti.com> Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
355 lines
9.3 KiB
C
355 lines
9.3 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/input.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <plat/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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struct omap4_keypad {
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struct input_dev *input;
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void __iomem *base;
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int irq;
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unsigned int rows;
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unsigned int cols;
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unsigned int row_shift;
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unsigned char key_state[8];
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unsigned short keymap[];
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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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__raw_writel(OMAP4_VAL_IRQDISABLE,
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keypad_data->base + OMAP4_KBD_IRQENABLE);
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*new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
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*(new_state + 1) = __raw_readl(keypad_data->base
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+ 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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__raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
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keypad_data->base + OMAP4_KBD_IRQSTATUS);
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/* enable interrupts */
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__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
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keypad_data->base + OMAP4_KBD_IRQENABLE);
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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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__raw_writel(OMAP4_VAL_FUNCTIONALCFG,
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keypad_data->base + OMAP4_KBD_CTRL);
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__raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
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keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
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__raw_writel(OMAP4_VAL_IRQDISABLE,
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keypad_data->base + OMAP4_KBD_IRQSTATUS);
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__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
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keypad_data->base + OMAP4_KBD_IRQENABLE);
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__raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA,
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keypad_data->base + OMAP4_KBD_WAKEUPENABLE);
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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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__raw_writel(OMAP4_VAL_IRQDISABLE,
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keypad_data->base + OMAP4_KBD_IRQENABLE);
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/* clear pending interrupts */
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__raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
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keypad_data->base + 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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static int __devinit 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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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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resource_size_t size;
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unsigned int row_shift, max_keys;
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int irq;
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int error;
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/* platform data */
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data defined\n");
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return -EINVAL;
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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, "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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if (!pdata->keymap_data) {
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dev_err(&pdev->dev, "no keymap data defined\n");
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return -EINVAL;
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}
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row_shift = get_count_order(pdata->cols);
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max_keys = pdata->rows << row_shift;
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keypad_data = kzalloc(sizeof(struct omap4_keypad) +
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max_keys * sizeof(keypad_data->keymap[0]),
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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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size = resource_size(res);
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res = request_mem_region(res->start, size, 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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keypad_data->irq = irq;
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keypad_data->row_shift = row_shift;
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keypad_data->rows = pdata->rows;
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keypad_data->cols = pdata->cols;
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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_unmap;
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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_dev->keycode = keypad_data->keymap;
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input_dev->keycodesize = sizeof(keypad_data->keymap[0]);
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input_dev->keycodemax = max_keys;
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_REP, input_dev->evbit);
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(input_dev, keypad_data);
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matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
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input_dev->keycode, input_dev->keybit);
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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_enable(&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_input:
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input_free_device(input_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, size);
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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 __devexit 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);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver omap4_keypad_driver = {
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.probe = omap4_keypad_probe,
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.remove = __devexit_p(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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},
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};
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static int __init omap4_keypad_init(void)
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{
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return platform_driver_register(&omap4_keypad_driver);
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}
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module_init(omap4_keypad_init);
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static void __exit omap4_keypad_exit(void)
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{
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platform_driver_unregister(&omap4_keypad_driver);
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}
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module_exit(omap4_keypad_exit);
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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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