On Mon, Oct 29, 2012 at 06:20:45PM +0200, Felipe Balbi wrote:
> 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 ??
And that is why I do not like devm_* interface myself... But no, since
input device was allocated with devm_input_allocate_device() it does not
need to be explicitly freed or unregistered.
Thanks.
--
Dmitry
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