+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * DaVinci Key Scan Driver for TI platforms
- *
- * Copyright (C) 2009 Texas Instruments, Inc
- *
- * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
- *
- * Initial Code: Sandeep Paulraj <s-paulraj@ti.com>
- */
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/types.h>
-#include <linux/input.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-
-#include <linux/platform_data/keyscan-davinci.h>
-
-/* Key scan registers */
-#define DAVINCI_KEYSCAN_KEYCTRL 0x0000
-#define DAVINCI_KEYSCAN_INTENA 0x0004
-#define DAVINCI_KEYSCAN_INTFLAG 0x0008
-#define DAVINCI_KEYSCAN_INTCLR 0x000c
-#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010
-#define DAVINCI_KEYSCAN_INTERVAL 0x0014
-#define DAVINCI_KEYSCAN_CONTTIME 0x0018
-#define DAVINCI_KEYSCAN_CURRENTST 0x001c
-#define DAVINCI_KEYSCAN_PREVSTATE 0x0020
-#define DAVINCI_KEYSCAN_EMUCTRL 0x0024
-#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c
-
-/* Key Control Register (KEYCTRL) */
-#define DAVINCI_KEYSCAN_KEYEN 0x00000001
-#define DAVINCI_KEYSCAN_PREVMODE 0x00000002
-#define DAVINCI_KEYSCAN_CHATOFF 0x00000004
-#define DAVINCI_KEYSCAN_AUTODET 0x00000008
-#define DAVINCI_KEYSCAN_SCANMODE 0x00000010
-#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020
-
-/* Masks for the interrupts */
-#define DAVINCI_KEYSCAN_INT_CONT 0x00000008
-#define DAVINCI_KEYSCAN_INT_OFF 0x00000004
-#define DAVINCI_KEYSCAN_INT_ON 0x00000002
-#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001
-#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f
-
-struct davinci_ks {
- struct input_dev *input;
- struct davinci_ks_platform_data *pdata;
- int irq;
- void __iomem *base;
- resource_size_t pbase;
- size_t base_size;
- unsigned short keymap[];
-};
-
-/* Initializing the kp Module */
-static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
-{
- struct device *dev = &davinci_ks->input->dev;
- struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
- u32 matrix_ctrl;
-
- /* Enable all interrupts */
- __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
- davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
-
- /* Clear interrupts if any */
- __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
- davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
-
- /* Setup the scan period = strobe + interval */
- __raw_writel(pdata->strobe,
- davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
- __raw_writel(pdata->interval,
- davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
- __raw_writel(0x01,
- davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
-
- /* Define matrix type */
- switch (pdata->matrix_type) {
- case DAVINCI_KEYSCAN_MATRIX_4X4:
- matrix_ctrl = 0;
- break;
- case DAVINCI_KEYSCAN_MATRIX_5X3:
- matrix_ctrl = (1 << 6);
- break;
- default:
- dev_err(dev->parent, "wrong matrix type\n");
- return -EINVAL;
- }
-
- /* Enable key scan module and set matrix type */
- __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
- matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
-
- return 0;
-}
-
-static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
-{
- struct davinci_ks *davinci_ks = dev_id;
- struct device *dev = &davinci_ks->input->dev;
- unsigned short *keymap = davinci_ks->keymap;
- int keymapsize = davinci_ks->pdata->keymapsize;
- u32 prev_status, new_status, changed;
- bool release;
- int keycode = KEY_UNKNOWN;
- int i;
-
- /* Disable interrupt */
- __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
-
- /* Reading previous and new status of the key scan */
- prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
- new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
-
- changed = prev_status ^ new_status;
-
- if (changed) {
- /*
- * It goes through all bits in 'changed' to ensure
- * that no key changes are being missed
- */
- for (i = 0 ; i < keymapsize; i++) {
- if ((changed>>i) & 0x1) {
- keycode = keymap[i];
- release = (new_status >> i) & 0x1;
- dev_dbg(dev->parent, "key %d %s\n", keycode,
- release ? "released" : "pressed");
- input_report_key(davinci_ks->input, keycode,
- !release);
- input_sync(davinci_ks->input);
- }
- }
- /* Clearing interrupt */
- __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
- davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
- }
-
- /* Enable interrupts */
- __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
-
- return IRQ_HANDLED;
-}
-
-static int __init davinci_ks_probe(struct platform_device *pdev)
-{
- struct davinci_ks *davinci_ks;
- struct input_dev *key_dev;
- struct resource *res, *mem;
- struct device *dev = &pdev->dev;
- struct davinci_ks_platform_data *pdata = dev_get_platdata(dev);
- int error, i;
-
- if (pdata->device_enable) {
- error = pdata->device_enable(dev);
- if (error < 0) {
- dev_dbg(dev, "device enable function failed\n");
- return error;
- }
- }
-
- if (!pdata->keymap) {
- dev_dbg(dev, "no keymap from pdata\n");
- return -EINVAL;
- }
-
- davinci_ks = kzalloc(sizeof(struct davinci_ks) +
- sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
- if (!davinci_ks) {
- dev_dbg(dev, "could not allocate memory for private data\n");
- return -ENOMEM;
- }
-
- memcpy(davinci_ks->keymap, pdata->keymap,
- sizeof(unsigned short) * pdata->keymapsize);
-
- key_dev = input_allocate_device();
- if (!key_dev) {
- dev_dbg(dev, "could not allocate input device\n");
- error = -ENOMEM;
- goto fail1;
- }
-
- davinci_ks->input = key_dev;
-
- davinci_ks->irq = platform_get_irq(pdev, 0);
- if (davinci_ks->irq < 0) {
- error = davinci_ks->irq;
- goto fail2;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(dev, "no mem resource\n");
- error = -EINVAL;
- goto fail2;
- }
-
- davinci_ks->pbase = res->start;
- davinci_ks->base_size = resource_size(res);
-
- mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
- pdev->name);
- if (!mem) {
- dev_err(dev, "key scan registers at %08x are not free\n",
- davinci_ks->pbase);
- error = -EBUSY;
- goto fail2;
- }
-
- davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
- if (!davinci_ks->base) {
- dev_err(dev, "can't ioremap MEM resource.\n");
- error = -ENOMEM;
- goto fail3;
- }
-
- /* Enable auto repeat feature of Linux input subsystem */
- if (pdata->rep)
- __set_bit(EV_REP, key_dev->evbit);
-
- /* Setup input device */
- __set_bit(EV_KEY, key_dev->evbit);
-
- /* Setup the platform data */
- davinci_ks->pdata = pdata;
-
- for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
- __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
-
- key_dev->name = "davinci_keyscan";
- key_dev->phys = "davinci_keyscan/input0";
- key_dev->dev.parent = dev;
- key_dev->id.bustype = BUS_HOST;
- key_dev->id.vendor = 0x0001;
- key_dev->id.product = 0x0001;
- key_dev->id.version = 0x0001;
- key_dev->keycode = davinci_ks->keymap;
- key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
- key_dev->keycodemax = davinci_ks->pdata->keymapsize;
-
- error = input_register_device(davinci_ks->input);
- if (error < 0) {
- dev_err(dev, "unable to register davinci key scan device\n");
- goto fail4;
- }
-
- error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
- 0, pdev->name, davinci_ks);
- if (error < 0) {
- dev_err(dev, "unable to register davinci key scan interrupt\n");
- goto fail5;
- }
-
- error = davinci_ks_initialize(davinci_ks);
- if (error < 0) {
- dev_err(dev, "unable to initialize davinci key scan device\n");
- goto fail6;
- }
-
- platform_set_drvdata(pdev, davinci_ks);
- return 0;
-
-fail6:
- free_irq(davinci_ks->irq, davinci_ks);
-fail5:
- input_unregister_device(davinci_ks->input);
- key_dev = NULL;
-fail4:
- iounmap(davinci_ks->base);
-fail3:
- release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
-fail2:
- input_free_device(key_dev);
-fail1:
- kfree(davinci_ks);
-
- return error;
-}
-
-static int davinci_ks_remove(struct platform_device *pdev)
-{
- struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
-
- free_irq(davinci_ks->irq, davinci_ks);
-
- input_unregister_device(davinci_ks->input);
-
- iounmap(davinci_ks->base);
- release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
-
- kfree(davinci_ks);
-
- return 0;
-}
-
-static struct platform_driver davinci_ks_driver = {
- .driver = {
- .name = "davinci_keyscan",
- },
- .remove = davinci_ks_remove,
-};
-
-module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe);
-
-MODULE_AUTHOR("Miguel Aguilar");
-MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff