linux-kernel - Re: [PATCH 2/4] Input: keypad: Add smsc ece1099 keypad driver

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Message-ID: <20120821104549.GT10347@arwen.pp.htv.fi>
Date:	Tue, 21 Aug 2012 13:45:49 +0300
From:	Felipe Balbi <balbi@...com>
To:	Sourav Poddar <sourav.poddar@...com>
Cc:	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 2/4] Input: keypad: Add smsc ece1099 keypad driver

On Tue, Aug 21, 2012 at 04:15:38PM +0530, Sourav Poddar wrote:
> From: G, Manjunath Kondaiah <manjugk@...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.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Benoit Cousson <b-cousson@...com>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
> Signed-off-by: G, Manjunath Kondaiah <manjugk@...com>
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>

looks good. If you just fix my comment on free_irq() below, you can add:

Acked-by: Felipe Balbi <balbi@...com>

> +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_start, 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 = 0x37; addr < 0x3B; addr++)
> +		smsc_write(dev, addr, 0);
> +
> +	/* Set all outputs high (0x05-0x09) */
> +	for (addr = 0x05; addr < 0x09; addr++)
> +		smsc_write(dev, addr, 0xff);
> +
> +	/* Clear all GPIO interrupts (0x32-0x36) */
> +	for (addr = 0x32; addr < 0x36; addr++)
> +		smsc_write(dev, addr, 0xff);
> +
> +	addr_start = 0x12;
> +	for (i = 0; i <= kp->rows; i++) {
> +		addr = 0x12 + i;
> +		smsc_write(dev, addr, SMSC_KP_KSI);
> +	}
> +
> +	addr_start =  0x1A;
> +	for (i = 0; i <= kp->cols; i++) {
> +		addr = 0x1A + i;
> +		smsc_write(dev, addr, SMSC_KP_KSO);
> +	}
> +
> +	addr = SMSC_KP_INT_STAT;
> +	smsc_write(dev, addr, SMSC_KP_SET_HIGH);
> +
> +	addr = SMSC_WKUP_CTRL;
> +	smsc_write(dev, addr, SMSC_KP_SET_LOW_PWR);
> +
> +	addr = SMSC_KP_OUT;
> +	smsc_write(dev, addr, SMSC_KSO_ALL_LOW);
> +
> +	row_shift = get_count_order(kp->cols);
> +	max_keys = kp->rows << row_shift;
> +
> +	kp->row_shift = row_shift;
> +	kp->keymap = kzalloc(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);
> +	free_irq(kp->irq, NULL);

you're using devm_request_threaded_irq, this is unnecessary

> +err1:
> +	input_free_device(input);
> +	return ret;
> +}
> +
> +static int smsc_remove(struct platform_device *pdev)
> +{
> +	struct smsc_keypad *kp = platform_get_drvdata(pdev);
> +	free_irq(kp->irq, kp);

ditto.


-- 
balbi

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