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Date: Fri, 3 Jan 2014 02:36:41 +0100
From: Sebastian Reichel <sre@...g0.de>
To: Pavel Machek <pavel@....cz>
Cc: Marcel Holtmann <marcel@...tmann.org>,
Pali Rohár <pali.rohar@...il.com>,
Ивайло Димитров
<freemangordon@....bg>, "Gustavo F. Padovan" <gustavo@...ovan.org>,
Johan Hedberg <johan.hedberg@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
"linux-bluetooth@...r.kernel.org development"
<linux-bluetooth@...r.kernel.org>,
Ville Tervo <ville.tervo@...ia.com>
Subject: Re: [PATCH v4] Bluetooth: Add hci_h4p driver
Hi Pavel,
Here are some cleanup suggestions for probe, removal & module
initialization functions.
On Fri, Jan 03, 2014 at 01:17:54AM +0100, Pavel Machek wrote:
> +static int hci_h4p_probe(struct platform_device *pdev)
> +{
> + struct hci_h4p_platform_data *bt_plat_data;
> + struct hci_h4p_info *info;
> + int err;
> +
> + dev_info(&pdev->dev, "Registering HCI H4P device\n");
> + info = kzalloc(sizeof(struct hci_h4p_info), GFP_KERNEL);
info = devm_kzalloc(&pdev->dev, sizeof(struct hci_h4p_info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->dev = &pdev->dev;
> + info->tx_enabled = 1;
> + info->rx_enabled = 1;
> + spin_lock_init(&info->lock);
> + spin_lock_init(&info->clocks_lock);
> + skb_queue_head_init(&info->txq);
> +
> + if (pdev->dev.platform_data == NULL) {
> + dev_err(&pdev->dev, "Could not get Bluetooth config data\n");
> + kfree(info);
> + return -ENODATA;
> + }
> +
> + bt_plat_data = pdev->dev.platform_data;
> + info->chip_type = bt_plat_data->chip_type;
> + info->bt_wakeup_gpio = bt_plat_data->bt_wakeup_gpio;
> + info->host_wakeup_gpio = bt_plat_data->host_wakeup_gpio;
> + info->reset_gpio = bt_plat_data->reset_gpio;
> + info->reset_gpio_shared = bt_plat_data->reset_gpio_shared;
> + info->bt_sysclk = bt_plat_data->bt_sysclk;
> +
> + BT_DBG("RESET gpio: %d\n", info->reset_gpio);
> + BT_DBG("BTWU gpio: %d\n", info->bt_wakeup_gpio);
> + BT_DBG("HOSTWU gpio: %d\n", info->host_wakeup_gpio);
> + BT_DBG("sysclk: %d\n", info->bt_sysclk);
> +
> + init_completion(&info->test_completion);
> + complete_all(&info->test_completion);
> +
> + if (!info->reset_gpio_shared) {
> + err = gpio_request(info->reset_gpio, "bt_reset");
err = devm_gpio_request_one(&pdev->dev, info->reset_gpio, GPIOF_OUT_INIT_LOW, "bt_reset");
> + if (err < 0) {
> + dev_err(&pdev->dev, "Cannot get GPIO line %d\n",
> + info->reset_gpio);
> + goto cleanup_setup;
> + }
> + }
> +
> + err = gpio_request(info->bt_wakeup_gpio, "bt_wakeup");
err = devm_gpio_request_one(&pdev->dev, info->bt_wakeup_gpio, GPIOF_OUT_INIT_LOW, "bt_wakeup");
> + if (err < 0) {
> + dev_err(info->dev, "Cannot get GPIO line 0x%d",
> + info->bt_wakeup_gpio);
> + if (!info->reset_gpio_shared)
> + gpio_free(info->reset_gpio);
> + goto cleanup_setup;
> + }
> +
> + err = gpio_request(info->host_wakeup_gpio, "host_wakeup");
err = devm_gpio_request_one(&pdev->dev, info->host_wakeup_gpio, GPIOF_DIR_IN, "host_wakeup");
> + if (err < 0) {
> + dev_err(info->dev, "Cannot get GPIO line %d",
> + info->host_wakeup_gpio);
> + if (!info->reset_gpio_shared)
> + gpio_free(info->reset_gpio);
> + gpio_free(info->bt_wakeup_gpio);
> + goto cleanup_setup;
> + }
> +
> + gpio_direction_output(info->reset_gpio, 0);
> + gpio_direction_output(info->bt_wakeup_gpio, 0);
> + gpio_direction_input(info->host_wakeup_gpio);
You can remove these when you use the _request_one gpio_request
methods.
> + info->irq = bt_plat_data->uart_irq;
> + info->uart_base = ioremap(bt_plat_data->uart_base, SZ_2K);
info->uart_base = devm_ioremap(&pdev->dev, bt_plat_data->uart_base, SZ_2K);
> + info->uart_iclk = clk_get(NULL, bt_plat_data->uart_iclk);
> + info->uart_fclk = clk_get(NULL, bt_plat_data->uart_fclk);
devm_clk_get(...)
> + err = request_irq(info->irq, hci_h4p_interrupt, IRQF_DISABLED, "hci_h4p",
> + info);
devm_request_irq(...)
> + if (err < 0) {
> + dev_err(info->dev, "hci_h4p: unable to get IRQ %d\n", info->irq);
> + goto cleanup;
> + }
> +
> + err = request_irq(gpio_to_irq(info->host_wakeup_gpio),
> + hci_h4p_wakeup_interrupt, IRQF_TRIGGER_FALLING |
> + IRQF_TRIGGER_RISING | IRQF_DISABLED,
> + "hci_h4p_wkup", info);
devm_request_irq(...)
> + if (err < 0) {
> + dev_err(info->dev, "hci_h4p: unable to get wakeup IRQ %d\n",
> + gpio_to_irq(info->host_wakeup_gpio));
> + free_irq(info->irq, info);
> + goto cleanup;
> + }
> +
> + err = irq_set_irq_wake(gpio_to_irq(info->host_wakeup_gpio), 1);
> + if (err < 0) {
> + dev_err(info->dev, "hci_h4p: unable to set wakeup for IRQ %d\n",
> + gpio_to_irq(info->host_wakeup_gpio));
> + free_irq(info->irq, info);
> + free_irq(gpio_to_irq(info->host_wakeup_gpio), info);
> + goto cleanup;
> + }
> +
> + init_timer_deferrable(&info->lazy_release);
> + info->lazy_release.function = hci_h4p_lazy_clock_release;
> + info->lazy_release.data = (unsigned long)info;
> + hci_h4p_set_clk(info, &info->tx_clocks_en, 1);
> + err = hci_h4p_reset_uart(info);
> + if (err < 0)
> + goto cleanup_irq;
> + gpio_set_value(info->reset_gpio, 0);
> + hci_h4p_set_clk(info, &info->tx_clocks_en, 0);
> +
> + platform_set_drvdata(pdev, info);
> +
> + if (hci_h4p_register_hdev(info) < 0) {
> + dev_err(info->dev, "failed to register hci_h4p hci device\n");
> + goto cleanup_irq;
> + }
> +
> + return 0;
> +
> +cleanup_irq:
> + free_irq(info->irq, (void *)info);
> + free_irq(gpio_to_irq(info->host_wakeup_gpio), info);
> +cleanup:
> + gpio_set_value(info->reset_gpio, 0);
> + if (!info->reset_gpio_shared)
> + gpio_free(info->reset_gpio);
> + gpio_free(info->bt_wakeup_gpio);
> + gpio_free(info->host_wakeup_gpio);
> +cleanup_setup:
> + kfree(info);
> + return err;
> +}
This can be removed after the conversion to devm_ methods.
> [...]
>
> +static int __init hci_h4p_init(void)
> +{
> + int err = 0;
> +
> + /* Register the driver with LDM */
> + err = platform_driver_register(&hci_h4p_driver);
> + if (err < 0)
> + printk(KERN_WARNING "failed to register hci_h4p driver\n");
> +
> + return err;
> +}
> +
> +static void __exit hci_h4p_exit(void)
> +{
> + platform_driver_unregister(&hci_h4p_driver);
> +}
>
> +module_init(hci_h4p_init);
> +module_exit(hci_h4p_exit);
module_platform_driver(hci_h4p_driver);
-- Sebastian
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