Input: add support for key scan interface of the LPC32xx SoC
This is a driver for the key scan interface of the LPC32xx SoC Signed-off-by: Roland Stigge <stigge@antcom.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
parent
13987435cc
commit
69690bec40
28
Documentation/devicetree/bindings/input/lpc32xx-key.txt
Normal file
28
Documentation/devicetree/bindings/input/lpc32xx-key.txt
Normal file
|
@ -0,0 +1,28 @@
|
|||
NXP LPC32xx Key Scan Interface
|
||||
|
||||
Required Properties:
|
||||
- compatible: Should be "nxp,lpc3220-key"
|
||||
- reg: Physical base address of the controller and length of memory mapped
|
||||
region.
|
||||
- interrupts: The interrupt number to the cpu.
|
||||
- keypad,num-rows: Number of rows and columns, e.g. 1: 1x1, 6: 6x6
|
||||
- keypad,num-columns: Must be equal to keypad,num-rows since LPC32xx only
|
||||
supports square matrices
|
||||
- nxp,debounce-delay-ms: Debounce delay in ms
|
||||
- nxp,scan-delay-ms: Repeated scan period in ms
|
||||
- linux,keymap: the key-code to be reported when the key is pressed
|
||||
and released, see also
|
||||
Documentation/devicetree/bindings/input/matrix-keymap.txt
|
||||
|
||||
Example:
|
||||
|
||||
key@40050000 {
|
||||
compatible = "nxp,lpc3220-key";
|
||||
reg = <0x40050000 0x1000>;
|
||||
interrupts = <54 0>;
|
||||
keypad,num-rows = <1>;
|
||||
keypad,num-columns = <1>;
|
||||
nxp,debounce-delay-ms = <3>;
|
||||
nxp,scan-delay-ms = <34>;
|
||||
linux,keymap = <0x00000002>;
|
||||
};
|
|
@ -332,6 +332,16 @@ config KEYBOARD_LOCOMO
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called locomokbd.
|
||||
|
||||
config KEYBOARD_LPC32XX
|
||||
tristate "LPC32XX matrix key scanner support"
|
||||
depends on ARCH_LPC32XX && OF
|
||||
help
|
||||
Say Y here if you want to use NXP LPC32XX SoC key scanner interface,
|
||||
connected to a key matrix.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called lpc32xx-keys.
|
||||
|
||||
config KEYBOARD_MAPLE
|
||||
tristate "Maple bus keyboard"
|
||||
depends on SH_DREAMCAST && MAPLE
|
||||
|
|
|
@ -26,6 +26,7 @@ obj-$(CONFIG_KEYBOARD_LKKBD) += lkkbd.o
|
|||
obj-$(CONFIG_KEYBOARD_LM8323) += lm8323.o
|
||||
obj-$(CONFIG_KEYBOARD_LM8333) += lm8333.o
|
||||
obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o
|
||||
obj-$(CONFIG_KEYBOARD_LPC32XX) += lpc32xx-keys.o
|
||||
obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
|
||||
obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o
|
||||
obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o
|
||||
|
|
394
drivers/input/keyboard/lpc32xx-keys.c
Normal file
394
drivers/input/keyboard/lpc32xx-keys.c
Normal file
|
@ -0,0 +1,394 @@
|
|||
/*
|
||||
* 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 program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
*
|
||||
* 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;
|
||||
struct resource *iores;
|
||||
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 __devinit lpc32xx_parse_dt(struct device *dev,
|
||||
struct lpc32xx_kscan_drv *kscandat)
|
||||
{
|
||||
struct device_node *np = dev->of_node;
|
||||
u32 rows = 0, columns = 0;
|
||||
|
||||
of_property_read_u32(np, "keypad,num-rows", &rows);
|
||||
of_property_read_u32(np, "keypad,num-columns", &columns);
|
||||
if (!rows || rows != columns) {
|
||||
dev_err(dev,
|
||||
"rows and columns must be specified and 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 __devinit 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 || irq >= NR_IRQS) {
|
||||
dev_err(&pdev->dev, "failed to get platform irq\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
kscandat = kzalloc(sizeof(struct lpc32xx_kscan_drv), GFP_KERNEL);
|
||||
if (!kscandat) {
|
||||
dev_err(&pdev->dev, "failed to allocate memory\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
error = lpc32xx_parse_dt(&pdev->dev, kscandat);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to parse device tree\n");
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
keymap_size = sizeof(kscandat->keymap[0]) *
|
||||
(kscandat->matrix_sz << kscandat->row_shift);
|
||||
kscandat->keymap = kzalloc(keymap_size, GFP_KERNEL);
|
||||
if (!kscandat->keymap) {
|
||||
dev_err(&pdev->dev, "could not allocate memory for keymap\n");
|
||||
error = -ENOMEM;
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
kscandat->input = input = input_allocate_device();
|
||||
if (!input) {
|
||||
dev_err(&pdev->dev, "failed to allocate input device\n");
|
||||
error = -ENOMEM;
|
||||
goto err_free_keymap;
|
||||
}
|
||||
|
||||
/* 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");
|
||||
goto err_free_input;
|
||||
}
|
||||
|
||||
input_set_drvdata(kscandat->input, kscandat);
|
||||
|
||||
kscandat->iores = request_mem_region(res->start, resource_size(res),
|
||||
pdev->name);
|
||||
if (!kscandat->iores) {
|
||||
dev_err(&pdev->dev, "failed to request I/O memory\n");
|
||||
error = -EBUSY;
|
||||
goto err_free_input;
|
||||
}
|
||||
|
||||
kscandat->kscan_base = ioremap(kscandat->iores->start,
|
||||
resource_size(kscandat->iores));
|
||||
if (!kscandat->kscan_base) {
|
||||
dev_err(&pdev->dev, "failed to remap I/O memory\n");
|
||||
error = -EBUSY;
|
||||
goto err_release_memregion;
|
||||
}
|
||||
|
||||
/* Get the key scanner clock */
|
||||
kscandat->clk = clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(kscandat->clk)) {
|
||||
dev_err(&pdev->dev, "failed to get clock\n");
|
||||
error = PTR_ERR(kscandat->clk);
|
||||
goto err_unmap;
|
||||
}
|
||||
|
||||
/* Configure the key scanner */
|
||||
error = clk_prepare_enable(kscandat->clk);
|
||||
if (error)
|
||||
goto err_clk_put;
|
||||
|
||||
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 = request_irq(irq, lpc32xx_kscan_irq, 0, pdev->name, kscandat);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to request irq\n");
|
||||
goto err_clk_put;
|
||||
}
|
||||
|
||||
error = input_register_device(kscandat->input);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to register input device\n");
|
||||
goto err_free_irq;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, kscandat);
|
||||
return 0;
|
||||
|
||||
err_free_irq:
|
||||
free_irq(irq, kscandat);
|
||||
err_clk_put:
|
||||
clk_put(kscandat->clk);
|
||||
err_unmap:
|
||||
iounmap(kscandat->kscan_base);
|
||||
err_release_memregion:
|
||||
release_mem_region(kscandat->iores->start,
|
||||
resource_size(kscandat->iores));
|
||||
err_free_input:
|
||||
input_free_device(kscandat->input);
|
||||
err_free_keymap:
|
||||
kfree(kscandat->keymap);
|
||||
err_free_mem:
|
||||
kfree(kscandat);
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
static int __devexit lpc32xx_kscan_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
|
||||
|
||||
free_irq(platform_get_irq(pdev, 0), kscandat);
|
||||
clk_put(kscandat->clk);
|
||||
iounmap(kscandat->kscan_base);
|
||||
release_mem_region(kscandat->iores->start,
|
||||
resource_size(kscandat->iores));
|
||||
input_unregister_device(kscandat->input);
|
||||
kfree(kscandat->keymap);
|
||||
kfree(kscandat);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
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->users) {
|
||||
/* 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->users) {
|
||||
/* 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;
|
||||
}
|
||||
#endif
|
||||
|
||||
static 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,
|
||||
.remove = __devexit_p(lpc32xx_kscan_remove),
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.pm = &lpc32xx_kscan_pm_ops,
|
||||
.of_match_table = of_match_ptr(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");
|
Loading…
Reference in a new issue