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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