diff mbox

[PATCHv3,2/4] Input: keypad: Add smsc ece1099 keypad driver

Message ID 1349089310-22134-1-git-send-email-sourav.poddar@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Poddar, Sourav Oct. 1, 2012, 11:01 a.m. UTC
From: G, Manjunath Kondaiah <manjugk@ti.com>

SMSC ECE1099 is a keyboard scan or GPIO expansion device.The device
supports a keypad scan matrix of 23*8.This driver uses this
device as a keypad driver.

Tested on omap5430 evm with 3.6-rc6 custom kernel.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
---
Changes since v2:
 - Replace magic numbers through driver variable.
 - Provide comments for some initialisation done in probe.
 drivers/input/keyboard/Kconfig               |   11 +
 drivers/input/keyboard/Makefile              |    1 +
 drivers/input/keyboard/smsc-ece1099-keypad.c |  304 ++++++++++++++++++++++++++
 3 files changed, 316 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/keyboard/smsc-ece1099-keypad.c

Comments

Shubhrajyoti Datta Oct. 1, 2012, 2:58 p.m. UTC | #1
On Monday 01 October 2012 04:31 PM, Sourav Poddar wrote:
> +smsc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct smsc *smsc = dev_get_drvdata(pdev->dev.parent);
> +	struct input_dev *input;
> +	struct smsc_keypad *kp;
> +	int ret = 0, error;
> +	int col, i, max_keys, row_shift;
> +	int irq;
> +	int addr;
> +
> +	kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL);
> +
> +	input = input_allocate_device();
> +	if (!kp || !input) {
> +		error = -ENOMEM;
> +		goto err1;
> +	}
> +
> +	error = smsc_keypad_parse_dt(&pdev->dev, kp);
> +	if (error)
> +		return error;
>
Are we leaking input here?
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Dmitry Torokhov Oct. 2, 2012, 6:18 a.m. UTC | #2
Hi Sourav,

On Mon, Oct 01, 2012 at 04:31:50PM +0530, Sourav Poddar wrote:
> From: G, Manjunath Kondaiah <manjugk@ti.com>
> 
> SMSC ECE1099 is a keyboard scan or GPIO expansion device.The device
> supports a keypad scan matrix of 23*8.This driver uses this
> device as a keypad driver.
> 
> Tested on omap5430 evm with 3.6-rc6 custom kernel.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: Benoit Cousson <b-cousson@ti.com>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com>
> Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
> Acked-by: Felipe Balbi <balbi@ti.com>
> ---
> Changes since v2:
>  - Replace magic numbers through driver variable.
>  - Provide comments for some initialisation done in probe.
>  drivers/input/keyboard/Kconfig               |   11 +
>  drivers/input/keyboard/Makefile              |    1 +
>  drivers/input/keyboard/smsc-ece1099-keypad.c |  304 ++++++++++++++++++++++++++
>  3 files changed, 316 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/keyboard/smsc-ece1099-keypad.c
> 
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index c50fa75..b03a39c 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -593,6 +593,17 @@ config KEYBOARD_TWL4030
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called twl4030_keypad.
>  
> +config KEYBOARD_SMSC
> +       tristate "SMSC ECE1099 keypad support"

Should also select INPUT_MATRIXKMAP.

> +       depends on I2C
> +       help
> +         Say Y here if your board use the smsc keypad controller
> +         for omap5 defconfig. It's safe to say enable this
> +         even on boards that don't use the keypad controller.
> +
> +         To compile this driver as a module, choose M here: the
> +         module will be called smsc-ece1099-keypad.
> +
>  config KEYBOARD_XTKBD
>  	tristate "XT keyboard"
>  	select SERIO
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 44e7600..0f2aa26 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -52,5 +52,6 @@ obj-$(CONFIG_KEYBOARD_TC3589X)		+= tc3589x-keypad.o
>  obj-$(CONFIG_KEYBOARD_TEGRA)		+= tegra-kbc.o
>  obj-$(CONFIG_KEYBOARD_TNETV107X)	+= tnetv107x-keypad.o
>  obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o
> +obj-$(CONFIG_KEYBOARD_SMSC)            += smsc-ece1099-keypad.o
>  obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o
>  obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o
> diff --git a/drivers/input/keyboard/smsc-ece1099-keypad.c b/drivers/input/keyboard/smsc-ece1099-keypad.c
> new file mode 100644
> index 0000000..15dc147
> --- /dev/null
> +++ b/drivers/input/keyboard/smsc-ece1099-keypad.c
> @@ -0,0 +1,304 @@
> +/*
> + * SMSC_ECE1099 Keypad driver
> + *
> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
> + *
> + * 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/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/input.h>
> +#include <linux/gpio.h>
> +#include <linux/slab.h>
> +#include <linux/jiffies.h>
> +#include <linux/input/matrix_keypad.h>
> +#include <linux/delay.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/smsc.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of.h>
> +
> +#define KEYPRESS_TIME          200
> +
> +struct smsc_keypad {
> +	struct smsc *smsc;
> +	struct matrix_keymap_data *keymap_data;
> +	unsigned int last_key_state[16];
> +	unsigned int last_col;
> +	unsigned int last_key_ms[16];
> +	unsigned short *keymap;
> +	struct i2c_client *client;
> +	struct input_dev *input;
> +	int rows, cols;
> +	int row_shift;
> +	bool no_autorepeat;
> +	unsigned        irq;
> +	struct device *dev;
> +};
> +
> +static void smsc_kp_scan(struct smsc_keypad *kp)
> +{
> +	struct input_dev *input = kp->input;
> +	int i, j;
> +	int row, col;
> +	int temp, code;
> +	unsigned int new_state[16];
> +	unsigned int bits_changed;
> +	int this_ms;
> +
> +	smsc_write(kp->dev, SMSC_KP_INT_MASK, 0x00);
> +	smsc_write(kp->dev, SMSC_KP_INT_STAT, 0xFF);
> +
> +	/* Scan for row and column */
> +	for (i = 0; i < kp->cols; i++) {
> +		smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_EVAL + i);
> +		/* Read Row Status */
> +		smsc_read(kp->dev, SMSC_KP_IN, &temp);
> +		if (temp == 0xFF)
> +			continue;
> +
> +		col = i;
> +		for (j = 0; j < kp->rows; j++) {
> +			if ((temp & 0x01) != 0x00) {
> +				temp = temp >> 1;
> +				continue;
> +			}
> +
> +			row = j;
> +			new_state[col] =  (1 << row);
> +			bits_changed = kp->last_key_state[col] ^ new_state[col];
> +			this_ms = jiffies_to_msecs(jiffies);
> +			if (bits_changed != 0 || (!bits_changed &&
> +					((this_ms - kp->last_key_ms[col]) >= KEYPRESS_TIME))) {
> +				code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
> +				input_event(input, EV_MSC, MSC_SCAN, code);
> +				input_report_key(input, kp->keymap[code], 1);
> +				input_report_key(input, kp->keymap[code], 0);
> +				kp->last_key_state[col] = new_state[col];
> +				if (kp->last_col != col)
> +					kp->last_key_state[kp->last_col] = 0;
> +				kp->last_key_ms[col] = this_ms;
> +			}
> +			temp = temp >> 1;
> +		}
> +	}
> +	input_sync(input);
> +
> +	smsc_write(kp->dev, SMSC_KP_INT_MASK, 0xFF);
> +
> +	/* Set up Low Power Mode (Wake-up) (0xFB) */
> +	smsc_write(kp->dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
> +
> +	/*Enable Keypad Scan (generate interrupt on key press) (0x40)*/
> +	smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
> +}
> +
> +static irqreturn_t do_kp_irq(int irq, void *_kp)
> +{
> +	struct smsc_keypad *kp = _kp;
> +	int int_status;
> +
> +	smsc_read(kp->dev, SMSC_KP_INT_STAT, &int_status);
> +	if (int_status)
> +		smsc_kp_scan(kp);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_OF
> +static int __devinit smsc_keypad_parse_dt(struct device *dev,
> +				struct smsc_keypad *kp)
> +{
> +	struct device_node *np = dev->of_node;
> +
> +	if (!np) {
> +		dev_err(dev, "missing DT data");
> +		return -EINVAL;
> +	}
> +
> +	of_property_read_u32(np, "keypad,num-rows", &kp->rows);
> +	of_property_read_u32(np, "keypad,num-columns", &kp->cols);
> +	if (!kp->rows || !kp->cols) {
> +		dev_err(dev, "number of keypad rows/columns not specified\n");
> +		return -EINVAL;
> +	}
> +
> +	if (of_property_read_bool(np, "linux,input-no-autorepeat"))
> +		kp->no_autorepeat = true;
> +
> +	return 0;
> +}
> +#else
> +static inline int smsc_keypad_parse_dt(struct device *dev,
> +				struct smsc_keypad *kp)
> +{
> +	return -ENOSYS;
> +}
> +#endif
> +
> +static int __devinit
> +smsc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct smsc *smsc = dev_get_drvdata(pdev->dev.parent);
> +	struct input_dev *input;
> +	struct smsc_keypad *kp;
> +	int ret = 0, error;
> +	int col, i, max_keys, row_shift;
> +	int irq;
> +	int addr;
> +
> +	kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL);
> +
> +	input = input_allocate_device();
> +	if (!kp || !input) {
> +		error = -ENOMEM;
> +		goto err1;
> +	}
> +
> +	error = smsc_keypad_parse_dt(&pdev->dev, kp);

It doe snot look like the driver is useful without DT... Should it
simply depend on OF and not even provide !OF stubs?

> +	if (error)

You are leaking input device here.

> +		return error;
> +
> +	/* Get the debug Device */
> +	kp->input = input;
> +	kp->smsc = smsc;
> +	kp->irq = platform_get_irq(pdev, 0);
> +	kp->dev = dev;
> +
> +	for (col = 0; col < 16; col++) {
> +		kp->last_key_state[col] = 0;
> +		kp->last_key_ms[col] = 0;

kzalloc should have already taken care of this.

> +	}
> +
> +	/* setup input device */
> +	 __set_bit(EV_KEY, input->evbit);
> +
> +	/* Enable auto repeat feature of Linux input subsystem */
> +	if (!(kp->no_autorepeat))

No need for extra parenthesis.

> +		__set_bit(EV_REP, input->evbit);
> +
> +	input_set_capability(input, EV_MSC, MSC_SCAN);
> +	input->name             = "SMSC Keypad";
> +	input->phys             = "smsc_keypad/input0";
> +	input->dev.parent       = &pdev->dev;
> +	input->id.bustype       = BUS_HOST;
> +	input->id.vendor        = 0x0001;
> +	input->id.product       = 0x0001;
> +	input->id.version       = 0x0003;
> +
> +	error = input_register_device(input);
> +	if (error) {
> +		dev_err(kp->dev,
> +			"Unable to register twl4030 keypad device\n");
> +		goto err1;
> +	}
> +
> +	/* Mask all GPIO interrupts (0x37-0x3B) */
> +	for (addr = SMSC_GPIO_INT_MASK_START;
> +			addr < SMSC_GPIO_INT_MASK_START + 4; addr++)
> +		smsc_write(dev, addr, 0);
> +
> +	/* Set all outputs high (0x05-0x09) */
> +	for (addr = SMSC_GPIO_DATA_OUT_START;
> +			addr < SMSC_GPIO_DATA_OUT_START + 4; addr++)
> +		smsc_write(dev, addr, 0xff);
> +
> +	/* Clear all GPIO interrupts (0x32-0x36) */
> +	for (addr = SMSC_GPIO_INT_STAT_START;
> +			addr < SMSC_GPIO_INT_STAT_START + 4; addr++)
> +		smsc_write(dev, addr, 0xff);
> +
> +	/* Configure the smsc pins as Keyboard scan Input */
> +	for (i = 0; i <= kp->rows; i++) {
> +		addr = 0x12 + i;
> +		smsc_write(dev, addr, SMSC_KP_KSI);
> +	}
> +
> +	/* Configure the smsc pins as Keyboard scan output */
> +	for (i = 0; i <= kp->cols; i++) {
> +		addr = 0x1A + i;
> +		smsc_write(dev, addr, SMSC_KP_KSO);
> +	}
> +
> +	smsc_write(dev, SMSC_KP_INT_STAT, SMSC_KP_SET_HIGH);
> +	smsc_write(dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
> +	smsc_write(dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
> +
> +	row_shift = get_count_order(kp->cols);
> +	max_keys = kp->rows << row_shift;
> +
> +	kp->row_shift = row_shift;
> +	kp->keymap = devm_kzalloc(dev, max_keys * sizeof(kp->keymap[0]),
> +					GFP_KERNEL);
> +	if (!kp->keymap) {
> +		dev_err(&pdev->dev, "Not enough memory for keymap\n");
> +		error = -ENOMEM;
> +	}
> +
> +	matrix_keypad_build_keymap(NULL, NULL, kp->rows,
> +			kp->cols, kp->keymap, input);

Needs error handling I believe.

> +
> +	/*
> +	* This ISR will always execute in kernel thread context because of
> +	* the need to access the SMSC over the I2C bus.
> +	*/
> +	ret = devm_request_threaded_irq(dev, kp->irq, NULL, do_kp_irq,
> +			IRQF_TRIGGER_FALLING | IRQF_ONESHOT, pdev->name, kp);
> +	if (ret) {
> +		dev_dbg(&pdev->dev, "request_irq failed for irq no=%d\n",
> +			irq);
> +		goto err2;
> +	}
> +
> +	/* Enable smsc keypad interrupts */
> +	ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff);
> +	if (ret < 0)
> +		goto err2;
> +
> +	return 0;
> +
> +err2:
> +	input_unregister_device(input);
> +err1:
> +	input_free_device(input);

Double free.

> +	return ret;
> +}
> +
> +static int __devexit smsc_remove(struct platform_device *pdev)
> +{
> +	struct smsc_keypad *kp = platform_get_drvdata(pdev);
> +	input_unregister_device(kp->input);

And your kernel goes *BOOM*

> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id smsc_keypad_dt_match[] = {
> +	{ .compatible = "smsc,keypad" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, smsc_keypad_dt_match);
> +#endif
> +
> +static struct platform_driver smsc_driver = {
> +	.driver = {
> +		.name	= "smsc-keypad",
> +		.of_match_table = of_match_ptr(smsc_keypad_dt_match),
> +		.owner  = THIS_MODULE,
> +	},
> +	.probe		= smsc_probe,
> +	.remove		= __devexit_p(smsc_remove),
> +};
> +
> +module_platform_driver(smsc_driver);
> +
> +MODULE_AUTHOR("G Kondaiah Manjunath <manjugk@ti.com>");
> +MODULE_DESCRIPTION("SMSC ECE1099 Keypad driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.1
> 

Thanks.
Poddar, Sourav Oct. 3, 2012, 5:56 a.m. UTC | #3
Hi Dmitry,

On Tue, Oct 2, 2012 at 11:48 AM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> Hi Sourav,
>
> On Mon, Oct 01, 2012 at 04:31:50PM +0530, Sourav Poddar wrote:
>> From: G, Manjunath Kondaiah <manjugk@ti.com>
>>
>> SMSC ECE1099 is a keyboard scan or GPIO expansion device.The device
>> supports a keypad scan matrix of 23*8.This driver uses this
>> device as a keypad driver.
>>
>> Tested on omap5430 evm with 3.6-rc6 custom kernel.
>>
>> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
>> Cc: Benoit Cousson <b-cousson@ti.com>
>> Cc: Felipe Balbi <balbi@ti.com>
>> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
>> Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com>
>> Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
>> Acked-by: Felipe Balbi <balbi@ti.com>
>> ---
>> Changes since v2:
>>  - Replace magic numbers through driver variable.
>>  - Provide comments for some initialisation done in probe.
>>  drivers/input/keyboard/Kconfig               |   11 +
>>  drivers/input/keyboard/Makefile              |    1 +
>>  drivers/input/keyboard/smsc-ece1099-keypad.c |  304 ++++++++++++++++++++++++++
>>  3 files changed, 316 insertions(+), 0 deletions(-)
>>  create mode 100644 drivers/input/keyboard/smsc-ece1099-keypad.c
>>
>> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
>> index c50fa75..b03a39c 100644
>> --- a/drivers/input/keyboard/Kconfig
>> +++ b/drivers/input/keyboard/Kconfig
>> @@ -593,6 +593,17 @@ config KEYBOARD_TWL4030
>>         To compile this driver as a module, choose M here: the
>>         module will be called twl4030_keypad.
>>
>> +config KEYBOARD_SMSC
>> +       tristate "SMSC ECE1099 keypad support"
>
> Should also select INPUT_MATRIXKMAP.
>
Yes, will include in the next version.
>> +       depends on I2C
>> +       help
>> +         Say Y here if your board use the smsc keypad controller
>> +         for omap5 defconfig. It's safe to say enable this
>> +         even on boards that don't use the keypad controller.
>> +
>> +         To compile this driver as a module, choose M here: the
>> +         module will be called smsc-ece1099-keypad.
>> +
>>  config KEYBOARD_XTKBD
>>       tristate "XT keyboard"
>>       select SERIO
>> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
>> index 44e7600..0f2aa26 100644
>> --- a/drivers/input/keyboard/Makefile
>> +++ b/drivers/input/keyboard/Makefile
>> @@ -52,5 +52,6 @@ obj-$(CONFIG_KEYBOARD_TC3589X)              += tc3589x-keypad.o
>>  obj-$(CONFIG_KEYBOARD_TEGRA)         += tegra-kbc.o
>>  obj-$(CONFIG_KEYBOARD_TNETV107X)     += tnetv107x-keypad.o
>>  obj-$(CONFIG_KEYBOARD_TWL4030)               += twl4030_keypad.o
>> +obj-$(CONFIG_KEYBOARD_SMSC)            += smsc-ece1099-keypad.o
>>  obj-$(CONFIG_KEYBOARD_XTKBD)         += xtkbd.o
>>  obj-$(CONFIG_KEYBOARD_W90P910)               += w90p910_keypad.o
>> diff --git a/drivers/input/keyboard/smsc-ece1099-keypad.c b/drivers/input/keyboard/smsc-ece1099-keypad.c
>> new file mode 100644
>> index 0000000..15dc147
>> --- /dev/null
>> +++ b/drivers/input/keyboard/smsc-ece1099-keypad.c
>> @@ -0,0 +1,304 @@
>> +/*
>> + * SMSC_ECE1099 Keypad driver
>> + *
>> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
>> + *
>> + * 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/i2c.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/init.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/input.h>
>> +#include <linux/gpio.h>
>> +#include <linux/slab.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/input/matrix_keypad.h>
>> +#include <linux/delay.h>
>> +#include <linux/mfd/core.h>
>> +#include <linux/mfd/smsc.h>
>> +#include <linux/of_gpio.h>
>> +#include <linux/of.h>
>> +
>> +#define KEYPRESS_TIME          200
>> +
>> +struct smsc_keypad {
>> +     struct smsc *smsc;
>> +     struct matrix_keymap_data *keymap_data;
>> +     unsigned int last_key_state[16];
>> +     unsigned int last_col;
>> +     unsigned int last_key_ms[16];
>> +     unsigned short *keymap;
>> +     struct i2c_client *client;
>> +     struct input_dev *input;
>> +     int rows, cols;
>> +     int row_shift;
>> +     bool no_autorepeat;
>> +     unsigned        irq;
>> +     struct device *dev;
>> +};
>> +
>> +static void smsc_kp_scan(struct smsc_keypad *kp)
>> +{
>> +     struct input_dev *input = kp->input;
>> +     int i, j;
>> +     int row, col;
>> +     int temp, code;
>> +     unsigned int new_state[16];
>> +     unsigned int bits_changed;
>> +     int this_ms;
>> +
>> +     smsc_write(kp->dev, SMSC_KP_INT_MASK, 0x00);
>> +     smsc_write(kp->dev, SMSC_KP_INT_STAT, 0xFF);
>> +
>> +     /* Scan for row and column */
>> +     for (i = 0; i < kp->cols; i++) {
>> +             smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_EVAL + i);
>> +             /* Read Row Status */
>> +             smsc_read(kp->dev, SMSC_KP_IN, &temp);
>> +             if (temp == 0xFF)
>> +                     continue;
>> +
>> +             col = i;
>> +             for (j = 0; j < kp->rows; j++) {
>> +                     if ((temp & 0x01) != 0x00) {
>> +                             temp = temp >> 1;
>> +                             continue;
>> +                     }
>> +
>> +                     row = j;
>> +                     new_state[col] =  (1 << row);
>> +                     bits_changed = kp->last_key_state[col] ^ new_state[col];
>> +                     this_ms = jiffies_to_msecs(jiffies);
>> +                     if (bits_changed != 0 || (!bits_changed &&
>> +                                     ((this_ms - kp->last_key_ms[col]) >= KEYPRESS_TIME))) {
>> +                             code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
>> +                             input_event(input, EV_MSC, MSC_SCAN, code);
>> +                             input_report_key(input, kp->keymap[code], 1);
>> +                             input_report_key(input, kp->keymap[code], 0);
>> +                             kp->last_key_state[col] = new_state[col];
>> +                             if (kp->last_col != col)
>> +                                     kp->last_key_state[kp->last_col] = 0;
>> +                             kp->last_key_ms[col] = this_ms;
>> +                     }
>> +                     temp = temp >> 1;
>> +             }
>> +     }
>> +     input_sync(input);
>> +
>> +     smsc_write(kp->dev, SMSC_KP_INT_MASK, 0xFF);
>> +
>> +     /* Set up Low Power Mode (Wake-up) (0xFB) */
>> +     smsc_write(kp->dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
>> +
>> +     /*Enable Keypad Scan (generate interrupt on key press) (0x40)*/
>> +     smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
>> +}
>> +
>> +static irqreturn_t do_kp_irq(int irq, void *_kp)
>> +{
>> +     struct smsc_keypad *kp = _kp;
>> +     int int_status;
>> +
>> +     smsc_read(kp->dev, SMSC_KP_INT_STAT, &int_status);
>> +     if (int_status)
>> +             smsc_kp_scan(kp);
>> +
>> +     return IRQ_HANDLED;
>> +}
>> +
>> +#ifdef CONFIG_OF
>> +static int __devinit smsc_keypad_parse_dt(struct device *dev,
>> +                             struct smsc_keypad *kp)
>> +{
>> +     struct device_node *np = dev->of_node;
>> +
>> +     if (!np) {
>> +             dev_err(dev, "missing DT data");
>> +             return -EINVAL;
>> +     }
>> +
>> +     of_property_read_u32(np, "keypad,num-rows", &kp->rows);
>> +     of_property_read_u32(np, "keypad,num-columns", &kp->cols);
>> +     if (!kp->rows || !kp->cols) {
>> +             dev_err(dev, "number of keypad rows/columns not specified\n");
>> +             return -EINVAL;
>> +     }
>> +
>> +     if (of_property_read_bool(np, "linux,input-no-autorepeat"))
>> +             kp->no_autorepeat = true;
>> +
>> +     return 0;
>> +}
>> +#else
>> +static inline int smsc_keypad_parse_dt(struct device *dev,
>> +                             struct smsc_keypad *kp)
>> +{
>> +     return -ENOSYS;
>> +}
>> +#endif
>> +
>> +static int __devinit
>> +smsc_probe(struct platform_device *pdev)
>> +{
>> +     struct device *dev = &pdev->dev;
>> +     struct smsc *smsc = dev_get_drvdata(pdev->dev.parent);
>> +     struct input_dev *input;
>> +     struct smsc_keypad *kp;
>> +     int ret = 0, error;
>> +     int col, i, max_keys, row_shift;
>> +     int irq;
>> +     int addr;
>> +
>> +     kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL);
>> +
>> +     input = input_allocate_device();
>> +     if (!kp || !input) {
>> +             error = -ENOMEM;
>> +             goto err1;
>> +     }
>> +
>> +     error = smsc_keypad_parse_dt(&pdev->dev, kp);
>
> It doe snot look like the driver is useful without DT... Should it
> simply depend on OF and not even provide !OF stubs?
>
Yes, the idea was to make this driver completely dt specific.

>> +     if (error)
>
> You are leaking input device here.
>
True, will include appropriate goto label.
>> +             return error;
>> +
>> +     /* Get the debug Device */
>> +     kp->input = input;
>> +     kp->smsc = smsc;
>> +     kp->irq = platform_get_irq(pdev, 0);
>> +     kp->dev = dev;
>> +
>> +     for (col = 0; col < 16; col++) {
>> +             kp->last_key_state[col] = 0;
>> +             kp->last_key_ms[col] = 0;
>
> kzalloc should have already taken care of this.
>
Ok. Will remove.
>> +     }
>> +
>> +     /* setup input device */
>> +      __set_bit(EV_KEY, input->evbit);
>> +
>> +     /* Enable auto repeat feature of Linux input subsystem */
>> +     if (!(kp->no_autorepeat))
>
> No need for extra parenthesis.
>
Will remove.
>> +             __set_bit(EV_REP, input->evbit);
>> +
>> +     input_set_capability(input, EV_MSC, MSC_SCAN);
>> +     input->name             = "SMSC Keypad";
>> +     input->phys             = "smsc_keypad/input0";
>> +     input->dev.parent       = &pdev->dev;
>> +     input->id.bustype       = BUS_HOST;
>> +     input->id.vendor        = 0x0001;
>> +     input->id.product       = 0x0001;
>> +     input->id.version       = 0x0003;
>> +
>> +     error = input_register_device(input);
>> +     if (error) {
>> +             dev_err(kp->dev,
>> +                     "Unable to register twl4030 keypad device\n");
>> +             goto err1;
>> +     }
>> +
>> +     /* Mask all GPIO interrupts (0x37-0x3B) */
>> +     for (addr = SMSC_GPIO_INT_MASK_START;
>> +                     addr < SMSC_GPIO_INT_MASK_START + 4; addr++)
>> +             smsc_write(dev, addr, 0);
>> +
>> +     /* Set all outputs high (0x05-0x09) */
>> +     for (addr = SMSC_GPIO_DATA_OUT_START;
>> +                     addr < SMSC_GPIO_DATA_OUT_START + 4; addr++)
>> +             smsc_write(dev, addr, 0xff);
>> +
>> +     /* Clear all GPIO interrupts (0x32-0x36) */
>> +     for (addr = SMSC_GPIO_INT_STAT_START;
>> +                     addr < SMSC_GPIO_INT_STAT_START + 4; addr++)
>> +             smsc_write(dev, addr, 0xff);
>> +
>> +     /* Configure the smsc pins as Keyboard scan Input */
>> +     for (i = 0; i <= kp->rows; i++) {
>> +             addr = 0x12 + i;
>> +             smsc_write(dev, addr, SMSC_KP_KSI);
>> +     }
>> +
>> +     /* Configure the smsc pins as Keyboard scan output */
>> +     for (i = 0; i <= kp->cols; i++) {
>> +             addr = 0x1A + i;
>> +             smsc_write(dev, addr, SMSC_KP_KSO);
>> +     }
>> +
>> +     smsc_write(dev, SMSC_KP_INT_STAT, SMSC_KP_SET_HIGH);
>> +     smsc_write(dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
>> +     smsc_write(dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
>> +
>> +     row_shift = get_count_order(kp->cols);
>> +     max_keys = kp->rows << row_shift;
>> +
>> +     kp->row_shift = row_shift;
>> +     kp->keymap = devm_kzalloc(dev, max_keys * sizeof(kp->keymap[0]),
>> +                                     GFP_KERNEL);
>> +     if (!kp->keymap) {
>> +             dev_err(&pdev->dev, "Not enough memory for keymap\n");
>> +             error = -ENOMEM;
>> +     }
>> +
>> +     matrix_keypad_build_keymap(NULL, NULL, kp->rows,
>> +                     kp->cols, kp->keymap, input);
>
> Needs error handling I believe.
>
True, missed that. Will include.
>> +
>> +     /*
>> +     * This ISR will always execute in kernel thread context because of
>> +     * the need to access the SMSC over the I2C bus.
>> +     */
>> +     ret = devm_request_threaded_irq(dev, kp->irq, NULL, do_kp_irq,
>> +                     IRQF_TRIGGER_FALLING | IRQF_ONESHOT, pdev->name, kp);
>> +     if (ret) {
>> +             dev_dbg(&pdev->dev, "request_irq failed for irq no=%d\n",
>> +                     irq);
>> +             goto err2;
>> +     }
>> +
>> +     /* Enable smsc keypad interrupts */
>> +     ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff);
>> +     if (ret < 0)
>> +             goto err2;
>> +
>> +     return 0;
>> +
>> +err2:
>> +     input_unregister_device(input);
>> +err1:
>> +     input_free_device(input);
>
> Double free.
>
I believe what you are trying to say here is that we dont really
need a " input_unregister_device" (as also I checked in other keypad
implementations) and do a "unregister_device" in the remove api ??
>> +     return ret;
>> +}
>> +
>> +static int __devexit smsc_remove(struct platform_device *pdev)
>> +{
>> +     struct smsc_keypad *kp = platform_get_drvdata(pdev);
>> +     input_unregister_device(kp->input);
>
> And your kernel goes *BOOM*
>
>> +
>> +     return 0;
>> +}
>> +
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id smsc_keypad_dt_match[] = {
>> +     { .compatible = "smsc,keypad" },
>> +     {},
>> +};
>> +MODULE_DEVICE_TABLE(of, smsc_keypad_dt_match);
>> +#endif
>> +
>> +static struct platform_driver smsc_driver = {
>> +     .driver = {
>> +             .name   = "smsc-keypad",
>> +             .of_match_table = of_match_ptr(smsc_keypad_dt_match),
>> +             .owner  = THIS_MODULE,
>> +     },
>> +     .probe          = smsc_probe,
>> +     .remove         = __devexit_p(smsc_remove),
>> +};
>> +
>> +module_platform_driver(smsc_driver);
>> +
>> +MODULE_AUTHOR("G Kondaiah Manjunath <manjugk@ti.com>");
>> +MODULE_DESCRIPTION("SMSC ECE1099 Keypad driver");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 1.7.1
>>
>
> Thanks.
>
> --
> Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Dmitry Torokhov Oct. 4, 2012, 7:24 a.m. UTC | #4
On Wed, Oct 03, 2012 at 11:26:46AM +0530, Poddar, Sourav wrote:
> Hi Dmitry,
> 
> On Tue, Oct 2, 2012 at 11:48 AM, Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> > Hi Sourav,
> >
> > On Mon, Oct 01, 2012 at 04:31:50PM +0530, Sourav Poddar wrote:
> >> From: G, Manjunath Kondaiah <manjugk@ti.com>
> >>
> >> +
> >> +     /* Enable smsc keypad interrupts */
> >> +     ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff);
> >> +     if (ret < 0)
> >> +             goto err2;
> >> +
> >> +     return 0;
> >> +
> >> +err2:
> >> +     input_unregister_device(input);
> >> +err1:
> >> +     input_free_device(input);
> >
> > Double free.
> >
> I believe what you are trying to say here is that we dont really
> need a " input_unregister_device" (as also I checked in other keypad
> implementations) and do a "unregister_device" in the remove api ??

What I was trying to say is that if input device has been registered
then you need to call input_unregister_device() to unregister and free
it, otherwise you need to call input_free_device(), but not both.

Thanks.
Poddar, Sourav Oct. 4, 2012, 8:15 a.m. UTC | #5
Hi Dmitry,
On Thursday 04 October 2012 12:54 PM, Dmitry Torokhov wrote:
> On Wed, Oct 03, 2012 at 11:26:46AM +0530, Poddar, Sourav wrote:
>> Hi Dmitry,
>>
>> On Tue, Oct 2, 2012 at 11:48 AM, Dmitry Torokhov
>> <dmitry.torokhov@gmail.com> wrote:
>>> Hi Sourav,
>>>
>>> On Mon, Oct 01, 2012 at 04:31:50PM +0530, Sourav Poddar wrote:
>>>> From: G, Manjunath Kondaiah <manjugk@ti.com>
>>>>
>>>> +
>>>> +     /* Enable smsc keypad interrupts */
>>>> +     ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff);
>>>> +     if (ret < 0)
>>>> +             goto err2;
>>>> +
>>>> +     return 0;
>>>> +
>>>> +err2:
>>>> +     input_unregister_device(input);
>>>> +err1:
>>>> +     input_free_device(input);
>>> Double free.
>>>
>> I believe what you are trying to say here is that we dont really
>> need a " input_unregister_device" (as also I checked in other keypad
>> implementations) and do a "unregister_device" in the remove api ??
> What I was trying to say is that if input device has been registered
> then you need to call input_unregister_device() to unregister and free
> it, otherwise you need to call input_free_device(), but not both.
>
> Thanks.
Ok. Thanks for the clarification. Will update and post a new version.

~Sourav

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index c50fa75..b03a39c 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -593,6 +593,17 @@  config KEYBOARD_TWL4030
 	  To compile this driver as a module, choose M here: the
 	  module will be called twl4030_keypad.
 
+config KEYBOARD_SMSC
+       tristate "SMSC ECE1099 keypad support"
+       depends on I2C
+       help
+         Say Y here if your board use the smsc keypad controller
+         for omap5 defconfig. It's safe to say enable this
+         even on boards that don't use the keypad controller.
+
+         To compile this driver as a module, choose M here: the
+         module will be called smsc-ece1099-keypad.
+
 config KEYBOARD_XTKBD
 	tristate "XT keyboard"
 	select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 44e7600..0f2aa26 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -52,5 +52,6 @@  obj-$(CONFIG_KEYBOARD_TC3589X)		+= tc3589x-keypad.o
 obj-$(CONFIG_KEYBOARD_TEGRA)		+= tegra-kbc.o
 obj-$(CONFIG_KEYBOARD_TNETV107X)	+= tnetv107x-keypad.o
 obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o
+obj-$(CONFIG_KEYBOARD_SMSC)            += smsc-ece1099-keypad.o
 obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o
 obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o
diff --git a/drivers/input/keyboard/smsc-ece1099-keypad.c b/drivers/input/keyboard/smsc-ece1099-keypad.c
new file mode 100644
index 0000000..15dc147
--- /dev/null
+++ b/drivers/input/keyboard/smsc-ece1099-keypad.c
@@ -0,0 +1,304 @@ 
+/*
+ * SMSC_ECE1099 Keypad driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/smsc.h>
+#include <linux/of_gpio.h>
+#include <linux/of.h>
+
+#define KEYPRESS_TIME          200
+
+struct smsc_keypad {
+	struct smsc *smsc;
+	struct matrix_keymap_data *keymap_data;
+	unsigned int last_key_state[16];
+	unsigned int last_col;
+	unsigned int last_key_ms[16];
+	unsigned short *keymap;
+	struct i2c_client *client;
+	struct input_dev *input;
+	int rows, cols;
+	int row_shift;
+	bool no_autorepeat;
+	unsigned        irq;
+	struct device *dev;
+};
+
+static void smsc_kp_scan(struct smsc_keypad *kp)
+{
+	struct input_dev *input = kp->input;
+	int i, j;
+	int row, col;
+	int temp, code;
+	unsigned int new_state[16];
+	unsigned int bits_changed;
+	int this_ms;
+
+	smsc_write(kp->dev, SMSC_KP_INT_MASK, 0x00);
+	smsc_write(kp->dev, SMSC_KP_INT_STAT, 0xFF);
+
+	/* Scan for row and column */
+	for (i = 0; i < kp->cols; i++) {
+		smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_EVAL + i);
+		/* Read Row Status */
+		smsc_read(kp->dev, SMSC_KP_IN, &temp);
+		if (temp == 0xFF)
+			continue;
+
+		col = i;
+		for (j = 0; j < kp->rows; j++) {
+			if ((temp & 0x01) != 0x00) {
+				temp = temp >> 1;
+				continue;
+			}
+
+			row = j;
+			new_state[col] =  (1 << row);
+			bits_changed = kp->last_key_state[col] ^ new_state[col];
+			this_ms = jiffies_to_msecs(jiffies);
+			if (bits_changed != 0 || (!bits_changed &&
+					((this_ms - kp->last_key_ms[col]) >= KEYPRESS_TIME))) {
+				code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
+				input_event(input, EV_MSC, MSC_SCAN, code);
+				input_report_key(input, kp->keymap[code], 1);
+				input_report_key(input, kp->keymap[code], 0);
+				kp->last_key_state[col] = new_state[col];
+				if (kp->last_col != col)
+					kp->last_key_state[kp->last_col] = 0;
+				kp->last_key_ms[col] = this_ms;
+			}
+			temp = temp >> 1;
+		}
+	}
+	input_sync(input);
+
+	smsc_write(kp->dev, SMSC_KP_INT_MASK, 0xFF);
+
+	/* Set up Low Power Mode (Wake-up) (0xFB) */
+	smsc_write(kp->dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
+
+	/*Enable Keypad Scan (generate interrupt on key press) (0x40)*/
+	smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
+}
+
+static irqreturn_t do_kp_irq(int irq, void *_kp)
+{
+	struct smsc_keypad *kp = _kp;
+	int int_status;
+
+	smsc_read(kp->dev, SMSC_KP_INT_STAT, &int_status);
+	if (int_status)
+		smsc_kp_scan(kp);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_OF
+static int __devinit smsc_keypad_parse_dt(struct device *dev,
+				struct smsc_keypad *kp)
+{
+	struct device_node *np = dev->of_node;
+
+	if (!np) {
+		dev_err(dev, "missing DT data");
+		return -EINVAL;
+	}
+
+	of_property_read_u32(np, "keypad,num-rows", &kp->rows);
+	of_property_read_u32(np, "keypad,num-columns", &kp->cols);
+	if (!kp->rows || !kp->cols) {
+		dev_err(dev, "number of keypad rows/columns not specified\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_bool(np, "linux,input-no-autorepeat"))
+		kp->no_autorepeat = true;
+
+	return 0;
+}
+#else
+static inline int smsc_keypad_parse_dt(struct device *dev,
+				struct smsc_keypad *kp)
+{
+	return -ENOSYS;
+}
+#endif
+
+static int __devinit
+smsc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct smsc *smsc = dev_get_drvdata(pdev->dev.parent);
+	struct input_dev *input;
+	struct smsc_keypad *kp;
+	int ret = 0, error;
+	int col, i, max_keys, row_shift;
+	int irq;
+	int addr;
+
+	kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL);
+
+	input = input_allocate_device();
+	if (!kp || !input) {
+		error = -ENOMEM;
+		goto err1;
+	}
+
+	error = smsc_keypad_parse_dt(&pdev->dev, kp);
+	if (error)
+		return error;
+
+	/* Get the debug Device */
+	kp->input = input;
+	kp->smsc = smsc;
+	kp->irq = platform_get_irq(pdev, 0);
+	kp->dev = dev;
+
+	for (col = 0; col < 16; col++) {
+		kp->last_key_state[col] = 0;
+		kp->last_key_ms[col] = 0;
+	}
+
+	/* setup input device */
+	 __set_bit(EV_KEY, input->evbit);
+
+	/* Enable auto repeat feature of Linux input subsystem */
+	if (!(kp->no_autorepeat))
+		__set_bit(EV_REP, input->evbit);
+
+	input_set_capability(input, EV_MSC, MSC_SCAN);
+	input->name             = "SMSC Keypad";
+	input->phys             = "smsc_keypad/input0";
+	input->dev.parent       = &pdev->dev;
+	input->id.bustype       = BUS_HOST;
+	input->id.vendor        = 0x0001;
+	input->id.product       = 0x0001;
+	input->id.version       = 0x0003;
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(kp->dev,
+			"Unable to register twl4030 keypad device\n");
+		goto err1;
+	}
+
+	/* Mask all GPIO interrupts (0x37-0x3B) */
+	for (addr = SMSC_GPIO_INT_MASK_START;
+			addr < SMSC_GPIO_INT_MASK_START + 4; addr++)
+		smsc_write(dev, addr, 0);
+
+	/* Set all outputs high (0x05-0x09) */
+	for (addr = SMSC_GPIO_DATA_OUT_START;
+			addr < SMSC_GPIO_DATA_OUT_START + 4; addr++)
+		smsc_write(dev, addr, 0xff);
+
+	/* Clear all GPIO interrupts (0x32-0x36) */
+	for (addr = SMSC_GPIO_INT_STAT_START;
+			addr < SMSC_GPIO_INT_STAT_START + 4; addr++)
+		smsc_write(dev, addr, 0xff);
+
+	/* Configure the smsc pins as Keyboard scan Input */
+	for (i = 0; i <= kp->rows; i++) {
+		addr = 0x12 + i;
+		smsc_write(dev, addr, SMSC_KP_KSI);
+	}
+
+	/* Configure the smsc pins as Keyboard scan output */
+	for (i = 0; i <= kp->cols; i++) {
+		addr = 0x1A + i;
+		smsc_write(dev, addr, SMSC_KP_KSO);
+	}
+
+	smsc_write(dev, SMSC_KP_INT_STAT, SMSC_KP_SET_HIGH);
+	smsc_write(dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR);
+	smsc_write(dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW);
+
+	row_shift = get_count_order(kp->cols);
+	max_keys = kp->rows << row_shift;
+
+	kp->row_shift = row_shift;
+	kp->keymap = devm_kzalloc(dev, max_keys * sizeof(kp->keymap[0]),
+					GFP_KERNEL);
+	if (!kp->keymap) {
+		dev_err(&pdev->dev, "Not enough memory for keymap\n");
+		error = -ENOMEM;
+	}
+
+	matrix_keypad_build_keymap(NULL, NULL, kp->rows,
+			kp->cols, kp->keymap, input);
+
+	/*
+	* This ISR will always execute in kernel thread context because of
+	* the need to access the SMSC over the I2C bus.
+	*/
+	ret = devm_request_threaded_irq(dev, kp->irq, NULL, do_kp_irq,
+			IRQF_TRIGGER_FALLING | IRQF_ONESHOT, pdev->name, kp);
+	if (ret) {
+		dev_dbg(&pdev->dev, "request_irq failed for irq no=%d\n",
+			irq);
+		goto err2;
+	}
+
+	/* Enable smsc keypad interrupts */
+	ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff);
+	if (ret < 0)
+		goto err2;
+
+	return 0;
+
+err2:
+	input_unregister_device(input);
+err1:
+	input_free_device(input);
+	return ret;
+}
+
+static int __devexit smsc_remove(struct platform_device *pdev)
+{
+	struct smsc_keypad *kp = platform_get_drvdata(pdev);
+	input_unregister_device(kp->input);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id smsc_keypad_dt_match[] = {
+	{ .compatible = "smsc,keypad" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, smsc_keypad_dt_match);
+#endif
+
+static struct platform_driver smsc_driver = {
+	.driver = {
+		.name	= "smsc-keypad",
+		.of_match_table = of_match_ptr(smsc_keypad_dt_match),
+		.owner  = THIS_MODULE,
+	},
+	.probe		= smsc_probe,
+	.remove		= __devexit_p(smsc_remove),
+};
+
+module_platform_driver(smsc_driver);
+
+MODULE_AUTHOR("G Kondaiah Manjunath <manjugk@ti.com>");
+MODULE_DESCRIPTION("SMSC ECE1099 Keypad driver");
+MODULE_LICENSE("GPL v2");