linux-kernel - Re: [PATCHv5] Input: keypad: Add smsc ece1099 keypad driver

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Message-ID: <20121029162045.GK27566@arwen.pp.htv.fi>
Date:	Mon, 29 Oct 2012 18:20:45 +0200
From:	Felipe Balbi <balbi@...com>
To:	Sourav Poddar <sourav.poddar@...com>
CC:	<dmitry.torokhov@...il.com>, <linux-input@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <b-cousson@...com>, <balbi@...com>,
	<santosh.shilimkar@...com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv5] Input: keypad: Add smsc ece1099 keypad driver

Hi,

On Mon, Oct 29, 2012 at 04:08:49PM +0530, Sourav Poddar wrote:
> +static int __devinit
> +smsc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct input_dev *input;
> +	struct smsc_keypad *kp;
> +	int ret = 0;
> +	int i, max_keys, row_shift;
> +	int irq;
> +	int addr;
> +
> +	kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL);
> +
> +	input = devm_input_allocate_device(dev);
> +	if (!kp || !input)
> +		ret = -ENOMEM;
> +
> +	ret = smsc_keypad_parse_dt(dev, kp);
> +	if (ret)
> +		return ret;
> +
> +	/* Get the debug Device */
> +	kp->input = input;
> +	kp->irq = platform_get_irq(pdev, 0);
> +	kp->dev = dev;
> +
> +	/* 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;
> +
> +	input->open = smsc_keypad_open;
> +	input->close = smsc_keypad_close;
> +	input_set_drvdata(input, kp);
> +
> +	/* 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(dev, "Not enough memory for keymap\n");
> +		return -ENOMEM;
> +	}
> +
> +	ret = matrix_keypad_build_keymap(NULL, NULL, kp->rows,
> +			kp->cols, kp->keymap, input);
> +	if (ret) {
> +		dev_err(dev, "failed to build keymap\n");
> +		return ret;
> +	}
> +
> +	/*
> +	* 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(dev, "request_irq failed for irq no=%d\n",
> +			irq);
> +		return ret;
> +	}
> +
> +	ret = input_register_device(input);
> +	if (ret) {
> +		dev_err(kp->dev,
> +			"Unable to register twl4030 keypad device\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int __devexit smsc_remove(struct platform_device *pdev)
> +{

shouldn't you unregister the input device here ??

-- 
balbi

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