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d6ef90f1c0
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Eventually after all drivers are converted, .remove_new() is renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
182 lines
4.5 KiB
C
182 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* A low-level PATA driver to handle a Compact Flash connected on the
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* Mikrotik's RouterBoard 532 board.
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*
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* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
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* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
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*
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* This file was based on: drivers/ata/pata_ixp4xx_cf.c
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* Copyright (C) 2006-07 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* Also was based on the driver for Linux 2.4.xx published by Mikrotik for
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* their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
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* seems not to have a license.
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*/
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/gpio/consumer.h>
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#include <linux/libata.h>
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#include <scsi/scsi_host.h>
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#include <asm/mach-rc32434/rb.h>
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#define DRV_NAME "pata-rb532-cf"
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#define DRV_VERSION "0.1.0"
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#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
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#define RB500_CF_MAXPORTS 1
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#define RB500_CF_IO_DELAY 400
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#define RB500_CF_REG_BASE 0x0800
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#define RB500_CF_REG_ERR 0x080D
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#define RB500_CF_REG_CTRL 0x080E
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/* 32bit buffered data register offset */
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#define RB500_CF_REG_DBUF32 0x0C00
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struct rb532_cf_info {
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void __iomem *iobase;
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struct gpio_desc *gpio_line;
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unsigned int irq;
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};
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/* ------------------------------------------------------------------------ */
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static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
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{
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struct ata_host *ah = dev_instance;
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struct rb532_cf_info *info = ah->private_data;
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if (gpiod_get_value(info->gpio_line)) {
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irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
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ata_sff_interrupt(info->irq, dev_instance);
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} else {
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irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
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}
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return IRQ_HANDLED;
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}
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static struct ata_port_operations rb532_pata_port_ops = {
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.inherits = &ata_sff_port_ops,
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.sff_data_xfer = ata_sff_data_xfer32,
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};
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/* ------------------------------------------------------------------------ */
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static const struct scsi_host_template rb532_pata_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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/* ------------------------------------------------------------------------ */
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static void rb532_pata_setup_ports(struct ata_host *ah)
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{
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struct rb532_cf_info *info = ah->private_data;
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struct ata_port *ap;
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ap = ah->ports[0];
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ap->ops = &rb532_pata_port_ops;
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ap->pio_mask = ATA_PIO4;
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ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
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ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
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ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
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ata_sff_std_ports(&ap->ioaddr);
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ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
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ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
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}
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static int rb532_pata_driver_probe(struct platform_device *pdev)
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{
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int irq;
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struct gpio_desc *gpiod;
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struct resource *res;
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struct ata_host *ah;
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struct rb532_cf_info *info;
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "no IOMEM resource found\n");
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return -EINVAL;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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if (!irq)
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return -EINVAL;
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gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
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if (IS_ERR(gpiod)) {
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dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
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return PTR_ERR(gpiod);
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}
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gpiod_set_consumer_name(gpiod, DRV_NAME);
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/* allocate host */
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ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
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if (!ah)
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return -ENOMEM;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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ah->private_data = info;
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info->gpio_line = gpiod;
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info->irq = irq;
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info->iobase = devm_ioremap(&pdev->dev, res->start,
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resource_size(res));
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if (!info->iobase)
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return -ENOMEM;
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rb532_pata_setup_ports(ah);
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ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
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IRQF_TRIGGER_LOW, &rb532_pata_sht);
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if (ret)
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return ret;
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return 0;
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}
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static void rb532_pata_driver_remove(struct platform_device *pdev)
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{
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struct ata_host *ah = platform_get_drvdata(pdev);
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ata_host_detach(ah);
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}
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static struct platform_driver rb532_pata_platform_driver = {
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.probe = rb532_pata_driver_probe,
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.remove_new = rb532_pata_driver_remove,
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.driver = {
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.name = DRV_NAME,
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},
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};
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#define DRV_INFO DRV_DESC " version " DRV_VERSION
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module_platform_driver(rb532_pata_platform_driver);
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_VERSION(DRV_VERSION);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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