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271 lines
6.4 KiB
271 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Support code for the SCOOP interface found on various Sharp PDAs |
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* |
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* Copyright (c) 2004 Richard Purdie |
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* |
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* Based on code written by Sharp/Lineo for 2.4 kernels |
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*/ |
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#include <linux/device.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/export.h> |
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#include <linux/io.h> |
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#include <asm/hardware/scoop.h> |
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/* PCMCIA to Scoop linkage |
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There is no easy way to link multiple scoop devices into one |
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single entity for the pxa2xx_pcmcia device so this structure |
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is used which is setup by the platform code. |
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This file is never modular so this symbol is always |
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accessile to the board support files. |
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*/ |
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struct scoop_pcmcia_config *platform_scoop_config; |
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EXPORT_SYMBOL(platform_scoop_config); |
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struct scoop_dev { |
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void __iomem *base; |
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struct gpio_chip gpio; |
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spinlock_t scoop_lock; |
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unsigned short suspend_clr; |
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unsigned short suspend_set; |
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u32 scoop_gpwr; |
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}; |
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void reset_scoop(struct device *dev) |
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{ |
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struct scoop_dev *sdev = dev_get_drvdata(dev); |
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iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */ |
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iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */ |
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iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */ |
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iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */ |
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iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */ |
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iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */ |
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iowrite16(0x0000, sdev->base + SCOOP_IRM); |
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} |
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static void __scoop_gpio_set(struct scoop_dev *sdev, |
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unsigned offset, int value) |
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{ |
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unsigned short gpwr; |
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gpwr = ioread16(sdev->base + SCOOP_GPWR); |
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if (value) |
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gpwr |= 1 << (offset + 1); |
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else |
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gpwr &= ~(1 << (offset + 1)); |
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iowrite16(gpwr, sdev->base + SCOOP_GPWR); |
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} |
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static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
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{ |
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struct scoop_dev *sdev = gpiochip_get_data(chip); |
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unsigned long flags; |
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spin_lock_irqsave(&sdev->scoop_lock, flags); |
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__scoop_gpio_set(sdev, offset, value); |
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spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
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} |
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static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct scoop_dev *sdev = gpiochip_get_data(chip); |
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/* XXX: I'm unsure, but it seems so */ |
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return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1))); |
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} |
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static int scoop_gpio_direction_input(struct gpio_chip *chip, |
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unsigned offset) |
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{ |
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struct scoop_dev *sdev = gpiochip_get_data(chip); |
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unsigned long flags; |
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unsigned short gpcr; |
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spin_lock_irqsave(&sdev->scoop_lock, flags); |
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gpcr = ioread16(sdev->base + SCOOP_GPCR); |
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gpcr &= ~(1 << (offset + 1)); |
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iowrite16(gpcr, sdev->base + SCOOP_GPCR); |
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spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
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return 0; |
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} |
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static int scoop_gpio_direction_output(struct gpio_chip *chip, |
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unsigned offset, int value) |
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{ |
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struct scoop_dev *sdev = gpiochip_get_data(chip); |
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unsigned long flags; |
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unsigned short gpcr; |
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spin_lock_irqsave(&sdev->scoop_lock, flags); |
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__scoop_gpio_set(sdev, offset, value); |
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gpcr = ioread16(sdev->base + SCOOP_GPCR); |
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gpcr |= 1 << (offset + 1); |
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iowrite16(gpcr, sdev->base + SCOOP_GPCR); |
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spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
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return 0; |
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} |
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unsigned short read_scoop_reg(struct device *dev, unsigned short reg) |
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{ |
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struct scoop_dev *sdev = dev_get_drvdata(dev); |
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return ioread16(sdev->base + reg); |
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} |
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void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) |
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{ |
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struct scoop_dev *sdev = dev_get_drvdata(dev); |
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iowrite16(data, sdev->base + reg); |
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} |
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EXPORT_SYMBOL(reset_scoop); |
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EXPORT_SYMBOL(read_scoop_reg); |
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EXPORT_SYMBOL(write_scoop_reg); |
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#ifdef CONFIG_PM |
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static void check_scoop_reg(struct scoop_dev *sdev) |
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{ |
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unsigned short mcr; |
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mcr = ioread16(sdev->base + SCOOP_MCR); |
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if ((mcr & 0x100) == 0) |
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iowrite16(0x0101, sdev->base + SCOOP_MCR); |
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} |
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static int scoop_suspend(struct platform_device *dev, pm_message_t state) |
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{ |
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struct scoop_dev *sdev = platform_get_drvdata(dev); |
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check_scoop_reg(sdev); |
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sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR); |
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iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR); |
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return 0; |
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} |
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static int scoop_resume(struct platform_device *dev) |
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{ |
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struct scoop_dev *sdev = platform_get_drvdata(dev); |
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check_scoop_reg(sdev); |
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iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR); |
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return 0; |
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} |
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#else |
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#define scoop_suspend NULL |
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#define scoop_resume NULL |
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#endif |
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static int scoop_probe(struct platform_device *pdev) |
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{ |
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struct scoop_dev *devptr; |
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struct scoop_config *inf; |
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struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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int ret; |
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if (!mem) |
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return -EINVAL; |
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devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); |
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if (!devptr) |
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return -ENOMEM; |
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spin_lock_init(&devptr->scoop_lock); |
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inf = pdev->dev.platform_data; |
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devptr->base = ioremap(mem->start, resource_size(mem)); |
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if (!devptr->base) { |
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ret = -ENOMEM; |
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goto err_ioremap; |
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} |
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platform_set_drvdata(pdev, devptr); |
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printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base); |
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iowrite16(0x0140, devptr->base + SCOOP_MCR); |
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reset_scoop(&pdev->dev); |
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iowrite16(0x0000, devptr->base + SCOOP_CPR); |
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iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR); |
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iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR); |
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devptr->suspend_clr = inf->suspend_clr; |
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devptr->suspend_set = inf->suspend_set; |
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devptr->gpio.base = -1; |
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if (inf->gpio_base != 0) { |
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devptr->gpio.label = dev_name(&pdev->dev); |
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devptr->gpio.base = inf->gpio_base; |
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devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */ |
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devptr->gpio.set = scoop_gpio_set; |
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devptr->gpio.get = scoop_gpio_get; |
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devptr->gpio.direction_input = scoop_gpio_direction_input; |
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devptr->gpio.direction_output = scoop_gpio_direction_output; |
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ret = gpiochip_add_data(&devptr->gpio, devptr); |
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if (ret) |
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goto err_gpio; |
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} |
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return 0; |
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err_gpio: |
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platform_set_drvdata(pdev, NULL); |
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err_ioremap: |
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iounmap(devptr->base); |
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kfree(devptr); |
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return ret; |
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} |
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static int scoop_remove(struct platform_device *pdev) |
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{ |
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struct scoop_dev *sdev = platform_get_drvdata(pdev); |
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if (!sdev) |
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return -EINVAL; |
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if (sdev->gpio.base != -1) |
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gpiochip_remove(&sdev->gpio); |
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platform_set_drvdata(pdev, NULL); |
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iounmap(sdev->base); |
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kfree(sdev); |
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return 0; |
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} |
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static struct platform_driver scoop_driver = { |
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.probe = scoop_probe, |
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.remove = scoop_remove, |
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.suspend = scoop_suspend, |
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.resume = scoop_resume, |
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.driver = { |
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.name = "sharp-scoop", |
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}, |
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}; |
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static int __init scoop_init(void) |
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{ |
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return platform_driver_register(&scoop_driver); |
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} |
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subsys_initcall(scoop_init);
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