273 lines
6.3 KiB
C
273 lines
6.3 KiB
C
/*
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* linux/drivers/input/keyboard/pxa27x_keyboard.c
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*
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* Driver for the pxa27x matrix keyboard controller.
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*
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* Created: Feb 22, 2007
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* Author: Rodolfo Giometti <giometti@linux.it>
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*
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* Based on a previous implementations by Kevin O'Connor
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* <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
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* on some suggestions by Nicolas Pitre <nico@cam.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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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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/input.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/irqs.h>
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#include <asm/arch/pxa27x_keyboard.h>
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#define DRIVER_NAME "pxa27x-keyboard"
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#define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \
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col/2 == 1 ? KPASMKP1 : \
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col/2 == 2 ? KPASMKP2 : KPASMKP3)
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#define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2)))
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static struct clk *pxakbd_clk;
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static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input_dev = platform_get_drvdata(pdev);
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unsigned long kpc = KPC;
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int p, row, col, rel;
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if (kpc & KPC_DI) {
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unsigned long kpdk = KPDK;
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if (!(kpdk & KPDK_DKP)) {
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/* better luck next time */
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} else if (kpc & KPC_REE0) {
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unsigned long kprec = KPREC;
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KPREC = 0x7f;
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if (kprec & KPREC_OF0)
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rel = (kprec & 0xff) + 0x7f;
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else if (kprec & KPREC_UF0)
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rel = (kprec & 0xff) - 0x7f - 0xff;
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else
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rel = (kprec & 0xff) - 0x7f;
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if (rel) {
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input_report_rel(input_dev, REL_WHEEL, rel);
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input_sync(input_dev);
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}
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}
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}
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if (kpc & KPC_MI) {
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/* report the status of every button */
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for (row = 0; row < pdata->nr_rows; row++) {
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for (col = 0; col < pdata->nr_cols; col++) {
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p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
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1 : 0;
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pr_debug("keycode %x - pressed %x\n",
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pdata->keycodes[row][col], p);
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input_report_key(input_dev,
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pdata->keycodes[row][col], p);
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}
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}
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input_sync(input_dev);
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}
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return IRQ_HANDLED;
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}
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static int pxakbd_open(struct input_dev *dev)
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{
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/* Set keypad control register */
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KPC |= (KPC_ASACT |
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KPC_MS_ALL |
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(2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
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KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
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KPC &= ~KPC_AS; /* disable automatic scan */
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KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */
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/* Set rotary count to mid-point value */
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KPREC = 0x7F;
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/* Enable unit clock */
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clk_enable(pxakbd_clk);
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return 0;
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}
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static void pxakbd_close(struct input_dev *dev)
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{
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/* Disable clock unit */
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clk_disable(pxakbd_clk);
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}
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#ifdef CONFIG_PM
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static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
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/* Save controller status */
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pdata->reg_kpc = KPC;
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pdata->reg_kprec = KPREC;
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return 0;
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}
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static int pxakbd_resume(struct platform_device *pdev)
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{
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struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input_dev = platform_get_drvdata(pdev);
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mutex_lock(&input_dev->mutex);
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if (input_dev->users) {
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/* Restore controller status */
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KPC = pdata->reg_kpc;
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KPREC = pdata->reg_kprec;
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/* Enable unit clock */
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clk_disable(pxakbd_clk);
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clk_enable(pxakbd_clk);
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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
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#define pxakbd_suspend NULL
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#define pxakbd_resume NULL
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#endif
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static int __devinit pxakbd_probe(struct platform_device *pdev)
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{
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struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input_dev;
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int i, row, col, error;
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pxakbd_clk = clk_get(&pdev->dev, "KBDCLK");
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if (IS_ERR(pxakbd_clk)) {
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error = PTR_ERR(pxakbd_clk);
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goto err_clk;
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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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printk(KERN_ERR "Cannot request keypad device\n");
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error = -ENOMEM;
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goto err_alloc;
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}
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input_dev->name = DRIVER_NAME;
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input_dev->id.bustype = BUS_HOST;
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input_dev->open = pxakbd_open;
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input_dev->close = pxakbd_close;
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input_dev->dev.parent = &pdev->dev;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
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input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
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for (row = 0; row < pdata->nr_rows; row++) {
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for (col = 0; col < pdata->nr_cols; col++) {
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int code = pdata->keycodes[row][col];
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if (code > 0)
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set_bit(code, input_dev->keybit);
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}
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}
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error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
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DRIVER_NAME, pdev);
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if (error) {
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printk(KERN_ERR "Cannot request keypad IRQ\n");
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goto err_free_dev;
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}
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platform_set_drvdata(pdev, input_dev);
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/* Register the input device */
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error = input_register_device(input_dev);
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if (error)
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goto err_free_irq;
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/* Setup GPIOs. */
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for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
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pxa_gpio_mode(pdata->gpio_modes[i]);
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/*
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* Store rows/cols info into keyboard registers.
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*/
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KPC |= (pdata->nr_rows - 1) << 26;
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KPC |= (pdata->nr_cols - 1) << 23;
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for (col = 0; col < pdata->nr_cols; col++)
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KPC |= KPC_MS0 << col;
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return 0;
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err_free_irq:
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platform_set_drvdata(pdev, NULL);
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free_irq(IRQ_KEYPAD, pdev);
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err_free_dev:
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input_free_device(input_dev);
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err_alloc:
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clk_put(pxakbd_clk);
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err_clk:
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return error;
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}
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static int __devexit pxakbd_remove(struct platform_device *pdev)
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{
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struct input_dev *input_dev = platform_get_drvdata(pdev);
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input_unregister_device(input_dev);
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free_irq(IRQ_KEYPAD, pdev);
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clk_put(pxakbd_clk);
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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 pxakbd_driver = {
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.probe = pxakbd_probe,
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.remove = __devexit_p(pxakbd_remove),
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.suspend = pxakbd_suspend,
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.resume = pxakbd_resume,
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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static int __init pxakbd_init(void)
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{
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return platform_driver_register(&pxakbd_driver);
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}
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static void __exit pxakbd_exit(void)
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{
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platform_driver_unregister(&pxakbd_driver);
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}
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module_init(pxakbd_init);
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module_exit(pxakbd_exit);
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MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
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MODULE_LICENSE("GPL");
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