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Date: Wed, 14 Jan 2015 11:38:22 -0600
From: Felipe Balbi <balbi@...com>
To: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC: Felipe Balbi <balbi@...com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Arnd Bergmann <arnd@...db.de>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: Re: [PATCH 09/12] usb: gadget: at91_udc: Simplify probe and remove
functions
On Wed, Jan 14, 2015 at 05:22:01PM +0100, Alexandre Belloni wrote:
> From: Boris Brezillon <boris.brezillon@...e-electrons.com>
>
> Make use of devm_ functions to simplify probe and remove code.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Acked-by: Felipe Balbi <balbi@...com>
> ---
> drivers/usb/gadget/udc/at91_udc.c | 116 +++++++++++++-------------------------
> 1 file changed, 39 insertions(+), 77 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c
> index be7e16037ac4..4dba2c65dfd4 100644
> --- a/drivers/usb/gadget/udc/at91_udc.c
> +++ b/drivers/usb/gadget/udc/at91_udc.c
> @@ -1710,15 +1710,6 @@ static int at91udc_probe(struct platform_device *pdev)
> int retval;
> struct resource *res;
>
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (!res)
> - return -ENXIO;
> -
> - if (!request_mem_region(res->start, resource_size(res), driver_name)) {
> - DBG("someone's using UDC memory\n");
> - return -EBUSY;
> - }
> -
> /* init software state */
> udc = &controller;
> udc->gadget.dev.parent = dev;
> @@ -1731,13 +1722,13 @@ static int at91udc_probe(struct platform_device *pdev)
> if (cpu_is_at91rm9200()) {
> if (!gpio_is_valid(udc->board.pullup_pin)) {
> DBG("no D+ pullup?\n");
> - retval = -ENODEV;
> - goto fail0;
> + return -ENODEV;
> }
> - retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
> + retval = devm_gpio_request(dev, udc->board.pullup_pin,
> + "udc_pullup");
> if (retval) {
> DBG("D+ pullup is busy\n");
> - goto fail0;
> + return retval;
> }
> gpio_direction_output(udc->board.pullup_pin,
> udc->board.pullup_active_low);
> @@ -1756,32 +1747,32 @@ static int at91udc_probe(struct platform_device *pdev)
> udc->ep[3].maxpacket = 64;
> }
>
> - udc->udp_baseaddr = ioremap(res->start, resource_size(res));
> - if (!udc->udp_baseaddr) {
> - retval = -ENOMEM;
> - goto fail0a;
> - }
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + udc->udp_baseaddr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(udc->udp_baseaddr))
> + return PTR_ERR(udc->udp_baseaddr);
>
> udc_reinit(udc);
>
> /* get interface and function clocks */
> - udc->iclk = clk_get(dev, "pclk");
> - udc->fclk = clk_get(dev, "hclk");
> - if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
> - DBG("clocks missing\n");
> - retval = -ENODEV;
> - goto fail1;
> - }
> + udc->iclk = devm_clk_get(dev, "pclk");
> + if (IS_ERR(udc->iclk))
> + return PTR_ERR(udc->iclk);
> +
> + udc->fclk = devm_clk_get(dev, "hclk");
> + if (IS_ERR(udc->fclk))
> + return PTR_ERR(udc->fclk);
>
> /* don't do anything until we have both gadget driver and VBUS */
> clk_set_rate(udc->fclk, 48000000);
> retval = clk_prepare(udc->fclk);
> if (retval)
> - goto fail1;
> + return retval;
>
> retval = clk_prepare_enable(udc->iclk);
> if (retval)
> - goto fail1b;
> + goto err_unprepare_fclk;
> +
> at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
> at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
> /* Clear all pending interrupts - UDP may be used by bootloader. */
> @@ -1790,18 +1781,21 @@ static int at91udc_probe(struct platform_device *pdev)
>
> /* request UDC and maybe VBUS irqs */
> udc->udp_irq = platform_get_irq(pdev, 0);
> - retval = request_irq(udc->udp_irq, at91_udc_irq,
> - 0, driver_name, udc);
> - if (retval < 0) {
> + retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
> + driver_name, udc);
> + if (retval) {
> DBG("request irq %d failed\n", udc->udp_irq);
> - goto fail1c;
> + goto err_unprepare_iclk;
> }
> +
> if (gpio_is_valid(udc->board.vbus_pin)) {
> - retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
> - if (retval < 0) {
> + retval = devm_gpio_request(dev, udc->board.vbus_pin,
> + "udc_vbus");
> + if (retval) {
> DBG("request vbus pin failed\n");
> - goto fail2;
> + goto err_unprepare_iclk;
> }
> +
> gpio_direction_input(udc->board.vbus_pin);
>
> /*
> @@ -1818,12 +1812,13 @@ static int at91udc_probe(struct platform_device *pdev)
> mod_timer(&udc->vbus_timer,
> jiffies + VBUS_POLL_TIMEOUT);
> } else {
> - if (request_irq(gpio_to_irq(udc->board.vbus_pin),
> - at91_vbus_irq, 0, driver_name, udc)) {
> + retval = devm_request_irq(dev,
> + gpio_to_irq(udc->board.vbus_pin),
> + at91_vbus_irq, 0, driver_name, udc);
> + if (retval) {
> DBG("request vbus irq %d failed\n",
> udc->board.vbus_pin);
> - retval = -EBUSY;
> - goto fail3;
> + goto err_unprepare_iclk;
> }
> }
> } else {
> @@ -1832,44 +1827,27 @@ static int at91udc_probe(struct platform_device *pdev)
> }
> retval = usb_add_gadget_udc(dev, &udc->gadget);
> if (retval)
> - goto fail4;
> + goto err_unprepare_iclk;
> dev_set_drvdata(dev, udc);
> device_init_wakeup(dev, 1);
> create_debug_file(udc);
>
> INFO("%s version %s\n", driver_name, DRIVER_VERSION);
> return 0;
> -fail4:
> - if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
> - free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
> -fail3:
> - if (gpio_is_valid(udc->board.vbus_pin))
> - gpio_free(udc->board.vbus_pin);
> -fail2:
> - free_irq(udc->udp_irq, udc);
> -fail1c:
> +
> +err_unprepare_iclk:
> clk_unprepare(udc->iclk);
> -fail1b:
> +err_unprepare_fclk:
> clk_unprepare(udc->fclk);
> -fail1:
> - if (!IS_ERR(udc->fclk))
> - clk_put(udc->fclk);
> - if (!IS_ERR(udc->iclk))
> - clk_put(udc->iclk);
> - iounmap(udc->udp_baseaddr);
> -fail0a:
> - if (cpu_is_at91rm9200())
> - gpio_free(udc->board.pullup_pin);
> -fail0:
> - release_mem_region(res->start, resource_size(res));
> +
> DBG("%s probe failed, %d\n", driver_name, retval);
> +
> return retval;
> }
>
> static int __exit at91udc_remove(struct platform_device *pdev)
> {
> struct at91_udc *udc = platform_get_drvdata(pdev);
> - struct resource *res;
> unsigned long flags;
>
> DBG("remove\n");
> @@ -1884,25 +1862,9 @@ static int __exit at91udc_remove(struct platform_device *pdev)
>
> device_init_wakeup(&pdev->dev, 0);
> remove_debug_file(udc);
> - if (gpio_is_valid(udc->board.vbus_pin)) {
> - free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
> - gpio_free(udc->board.vbus_pin);
> - }
> - free_irq(udc->udp_irq, udc);
> - iounmap(udc->udp_baseaddr);
> -
> - if (cpu_is_at91rm9200())
> - gpio_free(udc->board.pullup_pin);
> -
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - release_mem_region(res->start, resource_size(res));
> -
> clk_unprepare(udc->fclk);
> clk_unprepare(udc->iclk);
>
> - clk_put(udc->iclk);
> - clk_put(udc->fclk);
> -
> return 0;
> }
>
> --
> 2.1.0
>
--
balbi
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