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Input: twl4030-keypad - add device tree support

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Add device tree support for twl4030 keypad driver.

Tested on Nokia N900.

Signed-off-by: Sebastian Reichel <sre@debian.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Sebastian Reichel 2014-01-04 00:41:03 -08:00 committed by Dmitry Torokhov
parent f048dd1725
commit 7abf38d6d1
2 changed files with 77 additions and 17 deletions
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27
Documentation/devicetree/bindings/input/twl4030-keypad.txt Normal file
View file

@ -0,0 +1,27 @@
* TWL4030's Keypad Controller device tree bindings
TWL4030's Keypad controller is used to interface a SoC with a matrix-type
keypad device. The keypad controller supports multiple row and column lines.
A key can be placed at each intersection of a unique row and a unique column.
The keypad controller can sense a key-press and key-release and report the
event using a interrupt to the cpu.
This binding is based on the matrix-keymap binding with the following
changes:
* keypad,num-rows and keypad,num-columns are required.
Required SoC Specific Properties:
- compatible: should be one of the following
- "ti,twl4030-keypad": For controllers compatible with twl4030 keypad
controller.
- interrupt: should be one of the following
- <1>: For controllers compatible with twl4030 keypad controller.
Example:
twl_keypad: keypad {
compatible = "ti,twl4030-keypad";
interrupts = <1>;
keypad,num-rows = <8>;
keypad,num-columns = <8>;
};

67
drivers/input/keyboard/twl4030_keypad.c
View file

@ -33,6 +33,7 @@
#include <linux/platform_device.h>
#include <linux/i2c/twl.h>
#include <linux/slab.h>
#include <linux/of.h>
/*
* The TWL4030 family chips include a keypad controller that supports
@ -60,6 +61,7 @@
struct twl4030_keypad {
unsigned short keymap[TWL4030_KEYMAP_SIZE];
u16 kp_state[TWL4030_MAX_ROWS];
bool autorepeat;
unsigned n_rows;
unsigned n_cols;
unsigned irq;
@ -331,20 +333,12 @@ static int twl4030_kp_program(struct twl4030_keypad *kp)
static int twl4030_kp_probe(struct platform_device *pdev)
{
struct twl4030_keypad_data *pdata = dev_get_platdata(&pdev->dev);
const struct matrix_keymap_data *keymap_data;
const struct matrix_keymap_data *keymap_data = NULL;
struct twl4030_keypad *kp;
struct input_dev *input;
u8 reg;
int error;
if (!pdata || !pdata->rows || !pdata->cols || !pdata->keymap_data ||
pdata->rows > TWL4030_MAX_ROWS || pdata->cols > TWL4030_MAX_COLS) {
dev_err(&pdev->dev, "Invalid platform_data\n");
return -EINVAL;
}
keymap_data = pdata->keymap_data;
kp = kzalloc(sizeof(*kp), GFP_KERNEL);
input = input_allocate_device();
if (!kp || !input) {
@ -352,13 +346,9 @@ static int twl4030_kp_probe(struct platform_device *pdev)
goto err1;
}
/* Get the debug Device */
kp->dbg_dev = &pdev->dev;
kp->input = input;
kp->n_rows = pdata->rows;
kp->n_cols = pdata->cols;
kp->irq = platform_get_irq(pdev, 0);
/* get the debug device */
kp->dbg_dev = &pdev->dev;
kp->input = input;
/* setup input device */
input->name = "TWL4030 Keypad";
@ -370,6 +360,40 @@ static int twl4030_kp_probe(struct platform_device *pdev)
input->id.product = 0x0001;
input->id.version = 0x0003;
if (pdata) {
if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
dev_err(&pdev->dev, "Missing platform_data\n");
error = -EINVAL;
goto err1;
}
kp->n_rows = pdata->rows;
kp->n_cols = pdata->cols;
kp->autorepeat = pdata->rep;
keymap_data = pdata->keymap_data;
} else {
error = matrix_keypad_parse_of_params(&pdev->dev, &kp->n_rows,
&kp->n_cols);
if (error)
goto err1;
kp->autorepeat = true;
}
if (kp->n_rows > TWL4030_MAX_ROWS || kp->n_cols > TWL4030_MAX_COLS) {
dev_err(&pdev->dev,
"Invalid rows/cols amount specified in platform/devicetree data\n");
error = -EINVAL;
goto err1;
}
kp->irq = platform_get_irq(pdev, 0);
if (!kp->irq) {
dev_err(&pdev->dev, "no keyboard irq assigned\n");
error = -EINVAL;
goto err1;
}
error = matrix_keypad_build_keymap(keymap_data, NULL,
TWL4030_MAX_ROWS,
1 << TWL4030_ROW_SHIFT,
@ -381,7 +405,7 @@ static int twl4030_kp_probe(struct platform_device *pdev)
input_set_capability(input, EV_MSC, MSC_SCAN);
/* Enable auto repeat feature of Linux input subsystem */
if (pdata->rep)
if (kp->autorepeat)
__set_bit(EV_REP, input->evbit);
error = input_register_device(input);
@ -443,6 +467,14 @@ static int twl4030_kp_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id twl4030_keypad_dt_match_table[] = {
{ .compatible = "ti,twl4030-keypad" },
{},
};
MODULE_DEVICE_TABLE(of, twl4030_keypad_dt_match_table);
#endif
/*
* NOTE: twl4030 are multi-function devices connected via I2C.
* So this device is a child of an I2C parent, thus it needs to
@ -455,6 +487,7 @@ static struct platform_driver twl4030_kp_driver = {
.driver = {
.name = "twl4030_keypad",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(twl4030_keypad_dt_match_table),
},
};
module_platform_driver(twl4030_kp_driver);