329 lines
8.4 KiB
C
329 lines
8.4 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* NXP LPC32xx SoC Key Scan Interface
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Kevin Wells <kevin.wells@nxp.com>
|
||
|
|
* Roland Stigge <stigge@antcom.de>
|
||
|
|
*
|
||
|
|
* Copyright (C) 2010 NXP Semiconductors
|
||
|
|
* Copyright (C) 2012 Roland Stigge
|
||
|
|
*
|
||
|
|
* This controller supports square key matrices from 1x1 up to 8x8
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/pm.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/input.h>
|
||
|
|
#include <linux/clk.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/input/matrix_keypad.h>
|
||
|
|
|
||
|
|
#define DRV_NAME "lpc32xx_keys"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Key scanner register offsets
|
||
|
|
*/
|
||
|
|
#define LPC32XX_KS_DEB(x) ((x) + 0x00)
|
||
|
|
#define LPC32XX_KS_STATE_COND(x) ((x) + 0x04)
|
||
|
|
#define LPC32XX_KS_IRQ(x) ((x) + 0x08)
|
||
|
|
#define LPC32XX_KS_SCAN_CTL(x) ((x) + 0x0C)
|
||
|
|
#define LPC32XX_KS_FAST_TST(x) ((x) + 0x10)
|
||
|
|
#define LPC32XX_KS_MATRIX_DIM(x) ((x) + 0x14) /* 1..8 */
|
||
|
|
#define LPC32XX_KS_DATA(x, y) ((x) + 0x40 + ((y) << 2))
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_DEB_NUM_DEB_PASS(n) ((n) & 0xFF)
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_SCOND_IN_IDLE 0x0
|
||
|
|
#define LPC32XX_KSCAN_SCOND_IN_SCANONCE 0x1
|
||
|
|
#define LPC32XX_KSCAN_SCOND_IN_IRQGEN 0x2
|
||
|
|
#define LPC32XX_KSCAN_SCOND_IN_SCAN_MATRIX 0x3
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_IRQ_PENDING_CLR 0x1
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_SCTRL_SCAN_DELAY(n) ((n) & 0xFF)
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_FTST_FORCESCANONCE 0x1
|
||
|
|
#define LPC32XX_KSCAN_FTST_USE32K_CLK 0x2
|
||
|
|
|
||
|
|
#define LPC32XX_KSCAN_MSEL_SELECT(n) ((n) & 0xF)
|
||
|
|
|
||
|
|
struct lpc32xx_kscan_drv {
|
||
|
|
struct input_dev *input;
|
||
|
|
struct clk *clk;
|
||
|
|
void __iomem *kscan_base;
|
||
|
|
unsigned int irq;
|
||
|
|
|
||
|
|
u32 matrix_sz; /* Size of matrix in XxY, ie. 3 = 3x3 */
|
||
|
|
u32 deb_clks; /* Debounce clocks (based on 32KHz clock) */
|
||
|
|
u32 scan_delay; /* Scan delay (based on 32KHz clock) */
|
||
|
|
|
||
|
|
unsigned short *keymap; /* Pointer to key map for the scan matrix */
|
||
|
|
unsigned int row_shift;
|
||
|
|
|
||
|
|
u8 lastkeystates[8];
|
||
|
|
};
|
||
|
|
|
||
|
|
static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
|
||
|
|
{
|
||
|
|
struct input_dev *input = kscandat->input;
|
||
|
|
unsigned row, changed, scancode, keycode;
|
||
|
|
u8 key;
|
||
|
|
|
||
|
|
key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
|
||
|
|
changed = key ^ kscandat->lastkeystates[col];
|
||
|
|
kscandat->lastkeystates[col] = key;
|
||
|
|
|
||
|
|
for (row = 0; changed; row++, changed >>= 1) {
|
||
|
|
if (changed & 1) {
|
||
|
|
/* Key state changed, signal an event */
|
||
|
|
scancode = MATRIX_SCAN_CODE(row, col,
|
||
|
|
kscandat->row_shift);
|
||
|
|
keycode = kscandat->keymap[scancode];
|
||
|
|
input_event(input, EV_MSC, MSC_SCAN, scancode);
|
||
|
|
input_report_key(input, keycode, key & (1 << row));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static irqreturn_t lpc32xx_kscan_irq(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
struct lpc32xx_kscan_drv *kscandat = dev_id;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < kscandat->matrix_sz; i++)
|
||
|
|
lpc32xx_mod_states(kscandat, i);
|
||
|
|
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
|
||
|
|
input_sync(kscandat->input);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lpc32xx_kscan_open(struct input_dev *dev)
|
||
|
|
{
|
||
|
|
struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
|
||
|
|
int error;
|
||
|
|
|
||
|
|
error = clk_prepare_enable(kscandat->clk);
|
||
|
|
if (error)
|
||
|
|
return error;
|
||
|
|
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void lpc32xx_kscan_close(struct input_dev *dev)
|
||
|
|
{
|
||
|
|
struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
|
||
|
|
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
clk_disable_unprepare(kscandat->clk);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lpc32xx_parse_dt(struct device *dev,
|
||
|
|
struct lpc32xx_kscan_drv *kscandat)
|
||
|
|
{
|
||
|
|
struct device_node *np = dev->of_node;
|
||
|
|
u32 rows = 0, columns = 0;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = matrix_keypad_parse_properties(dev, &rows, &columns);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
if (rows != columns) {
|
||
|
|
dev_err(dev, "rows and columns must be equal!\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
kscandat->matrix_sz = rows;
|
||
|
|
kscandat->row_shift = get_count_order(columns);
|
||
|
|
|
||
|
|
of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);
|
||
|
|
of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
|
||
|
|
if (!kscandat->deb_clks || !kscandat->scan_delay) {
|
||
|
|
dev_err(dev, "debounce or scan delay not specified\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lpc32xx_kscan_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct lpc32xx_kscan_drv *kscandat;
|
||
|
|
struct input_dev *input;
|
||
|
|
struct resource *res;
|
||
|
|
size_t keymap_size;
|
||
|
|
int error;
|
||
|
|
int irq;
|
||
|
|
|
||
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
|
if (!res) {
|
||
|
|
dev_err(&pdev->dev, "failed to get platform I/O memory\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
irq = platform_get_irq(pdev, 0);
|
||
|
|
if (irq < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
kscandat = devm_kzalloc(&pdev->dev, sizeof(*kscandat),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!kscandat)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
error = lpc32xx_parse_dt(&pdev->dev, kscandat);
|
||
|
|
if (error) {
|
||
|
|
dev_err(&pdev->dev, "failed to parse device tree\n");
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
keymap_size = sizeof(kscandat->keymap[0]) *
|
||
|
|
(kscandat->matrix_sz << kscandat->row_shift);
|
||
|
|
kscandat->keymap = devm_kzalloc(&pdev->dev, keymap_size, GFP_KERNEL);
|
||
|
|
if (!kscandat->keymap)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
kscandat->input = input = devm_input_allocate_device(&pdev->dev);
|
||
|
|
if (!input) {
|
||
|
|
dev_err(&pdev->dev, "failed to allocate input device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Setup key input */
|
||
|
|
input->name = pdev->name;
|
||
|
|
input->phys = "lpc32xx/input0";
|
||
|
|
input->id.vendor = 0x0001;
|
||
|
|
input->id.product = 0x0001;
|
||
|
|
input->id.version = 0x0100;
|
||
|
|
input->open = lpc32xx_kscan_open;
|
||
|
|
input->close = lpc32xx_kscan_close;
|
||
|
|
input->dev.parent = &pdev->dev;
|
||
|
|
|
||
|
|
input_set_capability(input, EV_MSC, MSC_SCAN);
|
||
|
|
|
||
|
|
error = matrix_keypad_build_keymap(NULL, NULL,
|
||
|
|
kscandat->matrix_sz,
|
||
|
|
kscandat->matrix_sz,
|
||
|
|
kscandat->keymap, kscandat->input);
|
||
|
|
if (error) {
|
||
|
|
dev_err(&pdev->dev, "failed to build keymap\n");
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
input_set_drvdata(kscandat->input, kscandat);
|
||
|
|
|
||
|
|
kscandat->kscan_base = devm_ioremap_resource(&pdev->dev, res);
|
||
|
|
if (IS_ERR(kscandat->kscan_base))
|
||
|
|
return PTR_ERR(kscandat->kscan_base);
|
||
|
|
|
||
|
|
/* Get the key scanner clock */
|
||
|
|
kscandat->clk = devm_clk_get(&pdev->dev, NULL);
|
||
|
|
if (IS_ERR(kscandat->clk)) {
|
||
|
|
dev_err(&pdev->dev, "failed to get clock\n");
|
||
|
|
return PTR_ERR(kscandat->clk);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure the key scanner */
|
||
|
|
error = clk_prepare_enable(kscandat->clk);
|
||
|
|
if (error)
|
||
|
|
return error;
|
||
|
|
|
||
|
|
writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));
|
||
|
|
writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));
|
||
|
|
writel(LPC32XX_KSCAN_FTST_USE32K_CLK,
|
||
|
|
LPC32XX_KS_FAST_TST(kscandat->kscan_base));
|
||
|
|
writel(kscandat->matrix_sz,
|
||
|
|
LPC32XX_KS_MATRIX_DIM(kscandat->kscan_base));
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
clk_disable_unprepare(kscandat->clk);
|
||
|
|
|
||
|
|
error = devm_request_irq(&pdev->dev, irq, lpc32xx_kscan_irq, 0,
|
||
|
|
pdev->name, kscandat);
|
||
|
|
if (error) {
|
||
|
|
dev_err(&pdev->dev, "failed to request irq\n");
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
error = input_register_device(kscandat->input);
|
||
|
|
if (error) {
|
||
|
|
dev_err(&pdev->dev, "failed to register input device\n");
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, kscandat);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lpc32xx_kscan_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct platform_device *pdev = to_platform_device(dev);
|
||
|
|
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
|
||
|
|
struct input_dev *input = kscandat->input;
|
||
|
|
|
||
|
|
mutex_lock(&input->mutex);
|
||
|
|
|
||
|
|
if (input_device_enabled(input)) {
|
||
|
|
/* Clear IRQ and disable clock */
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
clk_disable_unprepare(kscandat->clk);
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&input->mutex);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lpc32xx_kscan_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
struct platform_device *pdev = to_platform_device(dev);
|
||
|
|
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
|
||
|
|
struct input_dev *input = kscandat->input;
|
||
|
|
int retval = 0;
|
||
|
|
|
||
|
|
mutex_lock(&input->mutex);
|
||
|
|
|
||
|
|
if (input_device_enabled(input)) {
|
||
|
|
/* Enable clock and clear IRQ */
|
||
|
|
retval = clk_prepare_enable(kscandat->clk);
|
||
|
|
if (retval == 0)
|
||
|
|
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&input->mutex);
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(lpc32xx_kscan_pm_ops, lpc32xx_kscan_suspend,
|
||
|
|
lpc32xx_kscan_resume);
|
||
|
|
|
||
|
|
static const struct of_device_id lpc32xx_kscan_match[] = {
|
||
|
|
{ .compatible = "nxp,lpc3220-key" },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, lpc32xx_kscan_match);
|
||
|
|
|
||
|
|
static struct platform_driver lpc32xx_kscan_driver = {
|
||
|
|
.probe = lpc32xx_kscan_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = DRV_NAME,
|
||
|
|
.pm = pm_sleep_ptr(&lpc32xx_kscan_pm_ops),
|
||
|
|
.of_match_table = lpc32xx_kscan_match,
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(lpc32xx_kscan_driver);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
|
||
|
|
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
|
||
|
|
MODULE_DESCRIPTION("Key scanner driver for LPC32XX devices");
|