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Message-ID: <CAKdam57c=yc2AtG8R_ioMcxQhNj39i+f4PDuJM5wruWOSn5FYw@mail.gmail.com>
Date: Tue, 21 Aug 2012 17:00:44 +0530
From: "Poddar, Sourav" <sourav.poddar@...com>
To: balbi@...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
Hi,
On Tue, Aug 21, 2012 at 4:15 PM, Felipe Balbi <balbi@...com> wrote:
> 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
>
True. Will remove "free_irq" from the code.
>> +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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