2008-03-05 00:23:45 +01:00
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/*
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* SuperH KEYSC Keypad Driver
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*
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* Copyright (C) 2008 Magnus Damm
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*
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* Based on gpio_keys.c, Copyright 2005 Phil Blundell
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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/irq.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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2008-10-31 12:21:23 +01:00
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#include <linux/clk.h>
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2008-03-05 00:23:45 +01:00
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#include <linux/io.h>
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#include <asm/sh_keysc.h>
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#define KYCR1_OFFS 0x00
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#define KYCR2_OFFS 0x04
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#define KYINDR_OFFS 0x08
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#define KYOUTDR_OFFS 0x0c
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#define KYCR2_IRQ_LEVEL 0x10
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#define KYCR2_IRQ_DISABLED 0x00
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static const struct {
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unsigned char kymd, keyout, keyin;
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} sh_keysc_mode[] = {
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[SH_KEYSC_MODE_1] = { 0, 6, 5 },
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[SH_KEYSC_MODE_2] = { 1, 5, 6 },
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[SH_KEYSC_MODE_3] = { 2, 4, 7 },
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};
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struct sh_keysc_priv {
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void __iomem *iomem_base;
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2008-10-31 12:21:23 +01:00
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struct clk *clk;
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2008-03-05 00:23:45 +01:00
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unsigned long last_keys;
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struct input_dev *input;
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struct sh_keysc_info pdata;
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};
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static irqreturn_t sh_keysc_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 sh_keysc_priv *priv = platform_get_drvdata(pdev);
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struct sh_keysc_info *pdata = &priv->pdata;
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unsigned long keys, keys1, keys0, mask;
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unsigned char keyin_set, tmp;
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int i, k;
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dev_dbg(&pdev->dev, "isr!\n");
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keys1 = ~0;
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keys0 = 0;
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do {
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keys = 0;
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keyin_set = 0;
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iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
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for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
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iowrite16(0xfff ^ (3 << (i * 2)),
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priv->iomem_base + KYOUTDR_OFFS);
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udelay(pdata->delay);
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tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
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keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
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tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
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keyin_set |= tmp;
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}
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iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
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iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
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priv->iomem_base + KYCR2_OFFS);
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keys ^= ~0;
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keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
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sh_keysc_mode[pdata->mode].keyout)) - 1;
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keys1 &= keys;
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keys0 |= keys;
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dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);
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} while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);
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dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
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priv->last_keys, keys0, keys1);
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for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
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k = pdata->keycodes[i];
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if (!k)
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continue;
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mask = 1 << i;
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if (!((priv->last_keys ^ keys0) & mask))
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continue;
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if ((keys1 | keys0) & mask) {
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input_event(priv->input, EV_KEY, k, 1);
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priv->last_keys |= mask;
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}
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if (!(keys1 & mask)) {
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input_event(priv->input, EV_KEY, k, 0);
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priv->last_keys &= ~mask;
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}
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}
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input_sync(priv->input);
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return IRQ_HANDLED;
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}
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#define res_size(res) ((res)->end - (res)->start + 1)
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static int __devinit sh_keysc_probe(struct platform_device *pdev)
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{
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struct sh_keysc_priv *priv;
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struct sh_keysc_info *pdata;
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struct resource *res;
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struct input_dev *input;
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2008-10-31 12:21:23 +01:00
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char clk_name[8];
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2008-03-05 00:23:45 +01:00
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int i, k;
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int irq, error;
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if (!pdev->dev.platform_data) {
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dev_err(&pdev->dev, "no platform data defined\n");
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error = -EINVAL;
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goto err0;
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}
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error = -ENXIO;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to get I/O memory\n");
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goto err0;
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}
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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 irq\n");
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goto err0;
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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error = -ENOMEM;
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goto err0;
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}
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platform_set_drvdata(pdev, priv);
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memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
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pdata = &priv->pdata;
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priv->iomem_base = ioremap_nocache(res->start, res_size(res));
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if (priv->iomem_base == NULL) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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error = -ENXIO;
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2008-07-19 00:46:53 +02:00
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goto err1;
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2008-03-05 00:23:45 +01:00
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}
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2008-10-31 12:21:23 +01:00
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snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
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priv->clk = clk_get(&pdev->dev, clk_name);
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if (IS_ERR(priv->clk)) {
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dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
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error = PTR_ERR(priv->clk);
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goto err2;
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}
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2008-03-05 00:23:45 +01:00
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priv->input = input_allocate_device();
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if (!priv->input) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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error = -ENOMEM;
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2008-10-31 12:21:23 +01:00
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goto err3;
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2008-03-05 00:23:45 +01:00
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}
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input = priv->input;
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input->evbit[0] = BIT_MASK(EV_KEY);
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input->name = pdev->name;
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input->phys = "sh-keysc-keys/input0";
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input->dev.parent = &pdev->dev;
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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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error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
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if (error) {
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dev_err(&pdev->dev, "failed to request IRQ\n");
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2008-10-31 12:21:23 +01:00
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goto err4;
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2008-03-05 00:23:45 +01:00
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}
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for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
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k = pdata->keycodes[i];
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if (k)
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input_set_capability(input, EV_KEY, k);
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}
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error = input_register_device(input);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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2008-10-31 12:21:23 +01:00
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goto err5;
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2008-03-05 00:23:45 +01:00
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}
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2008-10-31 12:21:23 +01:00
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clk_enable(priv->clk);
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2008-03-05 00:23:45 +01:00
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iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) |
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pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
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iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
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iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);
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2009-03-10 07:24:21 +01:00
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device_init_wakeup(&pdev->dev, 1);
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2008-03-05 00:23:45 +01:00
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return 0;
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2008-10-31 12:21:23 +01:00
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err5:
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2008-07-19 00:46:53 +02:00
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free_irq(irq, pdev);
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2008-10-31 12:21:23 +01:00
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err4:
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2008-07-19 00:46:53 +02:00
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input_free_device(input);
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2008-10-31 12:21:23 +01:00
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err3:
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clk_put(priv->clk);
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2008-03-05 00:23:45 +01:00
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err2:
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2008-07-19 00:46:53 +02:00
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iounmap(priv->iomem_base);
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2008-03-05 00:23:45 +01:00
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err1:
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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err0:
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return error;
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}
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static int __devexit sh_keysc_remove(struct platform_device *pdev)
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{
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struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
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iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
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input_unregister_device(priv->input);
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free_irq(platform_get_irq(pdev, 0), pdev);
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iounmap(priv->iomem_base);
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2008-10-31 12:21:23 +01:00
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clk_disable(priv->clk);
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clk_put(priv->clk);
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2008-03-05 00:23:45 +01:00
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return 0;
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}
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2009-03-10 07:24:21 +01:00
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static int sh_keysc_suspend(struct device *dev)
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{
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2009-03-11 09:04:23 +01:00
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struct platform_device *pdev = to_platform_device(dev);
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struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
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2009-03-10 07:24:21 +01:00
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unsigned short value;
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value = ioread16(priv->iomem_base + KYCR1_OFFS);
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2008-03-05 00:23:45 +01:00
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2009-03-10 07:24:21 +01:00
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if (device_may_wakeup(dev))
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value |= 0x80;
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else
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value &= ~0x80;
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iowrite16(value, priv->iomem_base + KYCR1_OFFS);
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return 0;
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}
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static struct dev_pm_ops sh_keysc_dev_pm_ops = {
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.suspend = sh_keysc_suspend,
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};
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2008-03-05 00:23:45 +01:00
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struct platform_driver sh_keysc_device_driver = {
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.probe = sh_keysc_probe,
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.remove = __devexit_p(sh_keysc_remove),
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.driver = {
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.name = "sh_keysc",
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2009-03-10 07:24:21 +01:00
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.pm = &sh_keysc_dev_pm_ops,
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2008-03-05 00:23:45 +01:00
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}
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};
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static int __init sh_keysc_init(void)
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{
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return platform_driver_register(&sh_keysc_device_driver);
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}
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static void __exit sh_keysc_exit(void)
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{
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platform_driver_unregister(&sh_keysc_device_driver);
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}
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module_init(sh_keysc_init);
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module_exit(sh_keysc_exit);
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MODULE_AUTHOR("Magnus Damm");
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MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
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MODULE_LICENSE("GPL");
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