On Fri, May 22, 2015 at 10:36:37PM +0800, Frank.Li@xxxxxxxxxxxxx wrote:
> +static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
> +{
> + struct pwrkey_drv_data *pdata = NULL;
> + struct input_dev *input = NULL;
> + struct device_node *np, *snvs_np;
> + int error;
> +
> + /* Get SNVS register Page */
> + np = pdev->dev.of_node;
> + if (!np)
> + return -ENODEV;
> +
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + snvs_np = of_get_parent(pdev->dev.of_node);
> + if (!snvs_np)
> + return -ENODEV;
> +
> + pdata->snvs = syscon_node_to_regmap(snvs_np);
Same here, I suggest you have a 'regmap' property and call
syscon_regmap_lookup_by_phandle() to get regmap.
Shawn
> + of_node_put(snvs_np);
> +
> + if (!pdata->snvs) {
> + pr_err("Can't get snvs syscon\n");
> + return -ENODEV;
> + }
> +
> + if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
> + pdata->keycode = KEY_POWER;
> + dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
> + }
> +
> + pdata->wakeup = of_property_read_bool(np, "wakeup");
> +
> + pdata->irq = platform_get_irq(pdev, 0);
> + if (pdata->irq < 0) {
> + dev_err(&pdev->dev, "no irq defined in platform data\n");
> + return -EINVAL;
> + }
> +
> + regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
> +
> + /* clear the unexpected interrupt before driver ready */
> + regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
> +
> + setup_timer(&pdata->check_timer,
> + imx_imx_snvs_check_for_events, (unsigned long) pdata);
> +
> + input = devm_input_allocate_device(&pdev->dev);
> + if (!input) {
> + dev_err(&pdev->dev, "failed to allocate the input device\n");
> + return -ENOMEM;
> + }
> +
> + input->name = pdev->name;
> + input->phys = "snvs-pwrkey/input0";
> + input->id.bustype = BUS_HOST;
> +
> + input_set_capability(input, EV_KEY, pdata->keycode);
> +
> + /* input customer action to cancel release timer */
> + error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
> + if (error) {
> + dev_err(&pdev->dev, "failed to register remove action\n");
> + return error;
> + }
> +
> + error = devm_request_irq(&pdev->dev, pdata->irq,
> + imx_snvs_pwrkey_interrupt,
> + 0, pdev->name, pdev);
> +
> + if (error) {
> + dev_err(&pdev->dev, "interrupt not available.\n");
> + return error;
> + }
> +
> + error = input_register_device(input);
> + if (error < 0) {
> + dev_err(&pdev->dev, "failed to register input device\n");
> + input_free_device(input);
> + return error;
> + }
> +
> + pdata->input = input;
> + platform_set_drvdata(pdev, pdata);
> +
> + device_init_wakeup(&pdev->dev, pdata->wakeup);
> +
> + return 0;
> +}
> +
> +static int imx_snvs_pwrkey_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
> +
> + if (device_may_wakeup(&pdev->dev))
> + enable_irq_wake(pdata->irq);
> +
> + return 0;
> +}
> +
> +static int imx_snvs_pwrkey_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
> +
> + if (device_may_wakeup(&pdev->dev))
> + disable_irq_wake(pdata->irq);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id imx_snvs_pwrkey_ids[] = {
> + { .compatible = "fsl,sec-v4.0-pwrkey" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
> +
> +static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend,
> + imx_snvs_pwrkey_resume);
> +
> +static struct platform_driver imx_snvs_pwrkey_driver = {
> + .driver = {
> + .name = "snvs_pwrkey",
> + .pm = &imx_snvs_pwrkey_pm_ops,
> + .of_match_table = imx_snvs_pwrkey_ids,
> + },
> + .probe = imx_snvs_pwrkey_probe,
> +};
> +module_platform_driver(imx_snvs_pwrkey_driver);
> +
> +MODULE_AUTHOR("Freescale Semiconductor");
> +MODULE_DESCRIPTION("i.MX snvs power key Driver");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
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