mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
Input: add st-keyscan driver
This patch adds ST Keyscan driver to use the keypad hw a subset of ST boards provide. Specific board setup will be put in the given dt. Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org> Signed-off-by: Giuseppe Condorelli <giuseppe.condorelli@st.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
parent
c898620869
commit
062589b139
4 changed files with 346 additions and 0 deletions
60
Documentation/devicetree/bindings/input/st-keyscan.txt
Normal file
60
Documentation/devicetree/bindings/input/st-keyscan.txt
Normal file
|
@ -0,0 +1,60 @@
|
|||
* ST Keyscan controller Device Tree bindings
|
||||
|
||||
The ST keyscan controller Device Tree binding is based on the
|
||||
matrix-keymap.
|
||||
|
||||
Required properties:
|
||||
- compatible: "st,sti-keyscan"
|
||||
|
||||
- reg: Register base address and size of st-keyscan controller.
|
||||
|
||||
- interrupts: Interrupt number for the st-keyscan controller.
|
||||
|
||||
- clocks: Must contain one entry, for the module clock.
|
||||
See ../clocks/clock-bindings.txt for details.
|
||||
|
||||
- pinctrl: Should specify pin control groups used for this controller.
|
||||
See ../pinctrl/pinctrl-bindings.txt for details.
|
||||
|
||||
- linux,keymap: The keymap for keys as described in the binding document
|
||||
devicetree/bindings/input/matrix-keymap.txt.
|
||||
|
||||
- keypad,num-rows: Number of row lines connected to the keypad controller.
|
||||
|
||||
- keypad,num-columns: Number of column lines connected to the keypad
|
||||
controller.
|
||||
|
||||
Optional property:
|
||||
- st,debounce_us: Debouncing interval time in microseconds
|
||||
|
||||
Example:
|
||||
|
||||
keyscan: keyscan@fe4b0000 {
|
||||
compatible = "st,sti-keyscan";
|
||||
reg = <0xfe4b0000 0x2000>;
|
||||
interrupts = <GIC_SPI 212 IRQ_TYPE_NONE>;
|
||||
clocks = <&CLK_SYSIN>;
|
||||
pinctrl-names = "default";
|
||||
pinctrl-0 = <&pinctrl_keyscan>;
|
||||
|
||||
keypad,num-rows = <4>;
|
||||
keypad,num-columns = <4>;
|
||||
st,debounce_us = <5000>;
|
||||
|
||||
linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_F13)
|
||||
MATRIX_KEY(0x00, 0x01, KEY_F9)
|
||||
MATRIX_KEY(0x00, 0x02, KEY_F5)
|
||||
MATRIX_KEY(0x00, 0x03, KEY_F1)
|
||||
MATRIX_KEY(0x01, 0x00, KEY_F14)
|
||||
MATRIX_KEY(0x01, 0x01, KEY_F10)
|
||||
MATRIX_KEY(0x01, 0x02, KEY_F6)
|
||||
MATRIX_KEY(0x01, 0x03, KEY_F2)
|
||||
MATRIX_KEY(0x02, 0x00, KEY_F15)
|
||||
MATRIX_KEY(0x02, 0x01, KEY_F11)
|
||||
MATRIX_KEY(0x02, 0x02, KEY_F7)
|
||||
MATRIX_KEY(0x02, 0x03, KEY_F3)
|
||||
MATRIX_KEY(0x03, 0x00, KEY_F16)
|
||||
MATRIX_KEY(0x03, 0x01, KEY_F12)
|
||||
MATRIX_KEY(0x03, 0x02, KEY_F8)
|
||||
MATRIX_KEY(0x03, 0x03, KEY_F4) >;
|
||||
};
|
|
@ -524,6 +524,17 @@ config KEYBOARD_STOWAWAY
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called stowaway.
|
||||
|
||||
config KEYBOARD_ST_KEYSCAN
|
||||
tristate "STMicroelectronics keyscan support"
|
||||
depends on ARCH_STI || COMPILE_TEST
|
||||
select INPUT_MATRIXKMAP
|
||||
help
|
||||
Say Y here if you want to use a keypad attached to the keyscan block
|
||||
on some STMicroelectronics SoC devices.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called st-keyscan.
|
||||
|
||||
config KEYBOARD_SUNKBD
|
||||
tristate "Sun Type 4 and Type 5 keyboard"
|
||||
select SERIO
|
||||
|
|
|
@ -51,6 +51,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
|
|||
obj-$(CONFIG_KEYBOARD_SPEAR) += spear-keyboard.o
|
||||
obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o
|
||||
obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
|
||||
obj-$(CONFIG_KEYBOARD_ST_KEYSCAN) += st-keyscan.o
|
||||
obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
|
||||
obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
|
||||
obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
|
||||
|
|
274
drivers/input/keyboard/st-keyscan.c
Normal file
274
drivers/input/keyboard/st-keyscan.c
Normal file
|
@ -0,0 +1,274 @@
|
|||
/*
|
||||
* STMicroelectronics Key Scanning driver
|
||||
*
|
||||
* Copyright (c) 2014 STMicroelectonics Ltd.
|
||||
* Author: Stuart Menefy <stuart.menefy@st.com>
|
||||
*
|
||||
* Based on sh_keysc.c, copyright 2008 Magnus Damm
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/input/matrix_keypad.h>
|
||||
|
||||
#define ST_KEYSCAN_MAXKEYS 16
|
||||
|
||||
#define KEYSCAN_CONFIG_OFF 0x0
|
||||
#define KEYSCAN_CONFIG_ENABLE 0x1
|
||||
#define KEYSCAN_DEBOUNCE_TIME_OFF 0x4
|
||||
#define KEYSCAN_MATRIX_STATE_OFF 0x8
|
||||
#define KEYSCAN_MATRIX_DIM_OFF 0xc
|
||||
#define KEYSCAN_MATRIX_DIM_X_SHIFT 0x0
|
||||
#define KEYSCAN_MATRIX_DIM_Y_SHIFT 0x2
|
||||
|
||||
struct st_keyscan {
|
||||
void __iomem *base;
|
||||
int irq;
|
||||
struct clk *clk;
|
||||
struct input_dev *input_dev;
|
||||
unsigned long last_state;
|
||||
unsigned int n_rows;
|
||||
unsigned int n_cols;
|
||||
unsigned int debounce_us;
|
||||
};
|
||||
|
||||
static irqreturn_t keyscan_isr(int irq, void *dev_id)
|
||||
{
|
||||
struct st_keyscan *keypad = dev_id;
|
||||
unsigned short *keycode = keypad->input_dev->keycode;
|
||||
unsigned long state, change;
|
||||
int bit_nr;
|
||||
|
||||
state = readl(keypad->base + KEYSCAN_MATRIX_STATE_OFF) & 0xffff;
|
||||
change = keypad->last_state ^ state;
|
||||
keypad->last_state = state;
|
||||
|
||||
for_each_set_bit(bit_nr, &change, BITS_PER_LONG)
|
||||
input_report_key(keypad->input_dev,
|
||||
keycode[bit_nr], state & BIT(bit_nr));
|
||||
|
||||
input_sync(keypad->input_dev);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int keyscan_start(struct st_keyscan *keypad)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = clk_enable(keypad->clk);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
writel(keypad->debounce_us * (clk_get_rate(keypad->clk) / 1000000),
|
||||
keypad->base + KEYSCAN_DEBOUNCE_TIME_OFF);
|
||||
|
||||
writel(((keypad->n_cols - 1) << KEYSCAN_MATRIX_DIM_X_SHIFT) |
|
||||
((keypad->n_rows - 1) << KEYSCAN_MATRIX_DIM_Y_SHIFT),
|
||||
keypad->base + KEYSCAN_MATRIX_DIM_OFF);
|
||||
|
||||
writel(KEYSCAN_CONFIG_ENABLE, keypad->base + KEYSCAN_CONFIG_OFF);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void keyscan_stop(struct st_keyscan *keypad)
|
||||
{
|
||||
writel(0, keypad->base + KEYSCAN_CONFIG_OFF);
|
||||
|
||||
clk_disable(keypad->clk);
|
||||
}
|
||||
|
||||
static int keyscan_open(struct input_dev *dev)
|
||||
{
|
||||
struct st_keyscan *keypad = input_get_drvdata(dev);
|
||||
|
||||
return keyscan_start(keypad);
|
||||
}
|
||||
|
||||
static void keyscan_close(struct input_dev *dev)
|
||||
{
|
||||
struct st_keyscan *keypad = input_get_drvdata(dev);
|
||||
|
||||
keyscan_stop(keypad);
|
||||
}
|
||||
|
||||
static int keypad_matrix_key_parse_dt(struct st_keyscan *keypad_data)
|
||||
{
|
||||
struct device *dev = keypad_data->input_dev->dev.parent;
|
||||
struct device_node *np = dev->of_node;
|
||||
int error;
|
||||
|
||||
error = matrix_keypad_parse_of_params(dev, &keypad_data->n_rows,
|
||||
&keypad_data->n_cols);
|
||||
if (error) {
|
||||
dev_err(dev, "failed to parse keypad params\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
of_property_read_u32(np, "st,debounce-us", &keypad_data->debounce_us);
|
||||
|
||||
dev_dbg(dev, "n_rows=%d n_col=%d debounce=%d\n",
|
||||
keypad_data->n_rows, keypad_data->n_cols,
|
||||
keypad_data->debounce_us);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int keyscan_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct st_keyscan *keypad_data;
|
||||
struct input_dev *input_dev;
|
||||
struct resource *res;
|
||||
int error;
|
||||
|
||||
if (!pdev->dev.of_node) {
|
||||
dev_err(&pdev->dev, "no DT data present\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
keypad_data = devm_kzalloc(&pdev->dev, sizeof(*keypad_data),
|
||||
GFP_KERNEL);
|
||||
if (!keypad_data)
|
||||
return -ENOMEM;
|
||||
|
||||
input_dev = devm_input_allocate_device(&pdev->dev);
|
||||
if (!input_dev) {
|
||||
dev_err(&pdev->dev, "failed to allocate the input device\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
input_dev->name = pdev->name;
|
||||
input_dev->phys = "keyscan-keys/input0";
|
||||
input_dev->dev.parent = &pdev->dev;
|
||||
input_dev->open = keyscan_open;
|
||||
input_dev->close = keyscan_close;
|
||||
|
||||
input_dev->id.bustype = BUS_HOST;
|
||||
|
||||
error = keypad_matrix_key_parse_dt(keypad_data);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
error = matrix_keypad_build_keymap(NULL, NULL,
|
||||
keypad_data->n_rows,
|
||||
keypad_data->n_cols,
|
||||
NULL, input_dev);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to build keymap\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
input_set_drvdata(input_dev, keypad_data);
|
||||
|
||||
keypad_data->input_dev = input_dev;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
keypad_data->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(keypad_data->base))
|
||||
return PTR_ERR(keypad_data->base);
|
||||
|
||||
keypad_data->clk = devm_clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(keypad_data->clk)) {
|
||||
dev_err(&pdev->dev, "cannot get clock\n");
|
||||
return PTR_ERR(keypad_data->clk);
|
||||
}
|
||||
|
||||
error = clk_enable(keypad_data->clk);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to enable clock\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
keyscan_stop(keypad_data);
|
||||
|
||||
keypad_data->irq = platform_get_irq(pdev, 0);
|
||||
if (keypad_data->irq < 0) {
|
||||
dev_err(&pdev->dev, "no IRQ specified\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
error = devm_request_irq(&pdev->dev, keypad_data->irq, keyscan_isr, 0,
|
||||
pdev->name, keypad_data);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to request IRQ\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
error = input_register_device(input_dev);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "failed to register input device\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, keypad_data);
|
||||
|
||||
device_set_wakeup_capable(&pdev->dev, 1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int keyscan_suspend(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct st_keyscan *keypad = platform_get_drvdata(pdev);
|
||||
struct input_dev *input = keypad->input_dev;
|
||||
|
||||
mutex_lock(&input->mutex);
|
||||
|
||||
if (device_may_wakeup(dev))
|
||||
enable_irq_wake(keypad->irq);
|
||||
else if (input->users)
|
||||
keyscan_stop(keypad);
|
||||
|
||||
mutex_unlock(&input->mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int keyscan_resume(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct st_keyscan *keypad = platform_get_drvdata(pdev);
|
||||
struct input_dev *input = keypad->input_dev;
|
||||
int retval = 0;
|
||||
|
||||
mutex_lock(&input->mutex);
|
||||
|
||||
if (device_may_wakeup(dev))
|
||||
disable_irq_wake(keypad->irq);
|
||||
else if (input->users)
|
||||
retval = keyscan_start(keypad);
|
||||
|
||||
mutex_unlock(&input->mutex);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops, keyscan_suspend, keyscan_resume);
|
||||
|
||||
static const struct of_device_id keyscan_of_match[] = {
|
||||
{ .compatible = "st,sti-keyscan" },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, keyscan_of_match);
|
||||
|
||||
static struct platform_driver keyscan_device_driver = {
|
||||
.probe = keyscan_probe,
|
||||
.driver = {
|
||||
.name = "st-keyscan",
|
||||
.pm = &keyscan_dev_pm_ops,
|
||||
.of_match_table = of_match_ptr(keyscan_of_match),
|
||||
}
|
||||
};
|
||||
|
||||
module_platform_driver(keyscan_device_driver);
|
||||
|
||||
MODULE_AUTHOR("Stuart Menefy <stuart.menefy@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics keyscan device driver");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue