95 строки
2.3 KiB
C
95 строки
2.3 KiB
C
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/*
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* GPIO driver for the TS-4800 board
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*
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* Copyright (c) 2016 - Savoir-faire Linux
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/gpio/driver.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#define DEFAULT_PIN_NUMBER 16
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#define INPUT_REG_OFFSET 0x00
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#define OUTPUT_REG_OFFSET 0x02
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#define DIRECTION_REG_OFFSET 0x04
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static int ts4800_gpio_probe(struct platform_device *pdev)
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{
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struct device_node *node;
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struct gpio_chip *chip;
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struct resource *res;
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void __iomem *base_addr;
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int retval;
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u32 ngpios;
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chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base_addr = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base_addr))
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return PTR_ERR(base_addr);
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node = pdev->dev.of_node;
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if (!node)
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return -EINVAL;
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retval = of_property_read_u32(node, "ngpios", &ngpios);
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if (retval == -EINVAL)
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ngpios = DEFAULT_PIN_NUMBER;
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else if (retval)
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return retval;
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retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET,
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base_addr + OUTPUT_REG_OFFSET, NULL,
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base_addr + DIRECTION_REG_OFFSET, NULL,
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BGPIOF_BIG_ENDIAN & BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (retval) {
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dev_err(&pdev->dev, "bgpio_init failed\n");
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return retval;
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}
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chip->base = -1;
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chip->label = dev_name(&pdev->dev);
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chip->ngpio = ngpios;
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platform_set_drvdata(pdev, chip);
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return gpiochip_add_data(chip, NULL);
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}
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static int ts4800_gpio_remove(struct platform_device *pdev)
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{
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struct gpio_chip *chip = platform_get_drvdata(pdev);
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gpiochip_remove(chip);
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return 0;
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}
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static const struct of_device_id ts4800_gpio_of_match[] = {
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{ .compatible = "technologic,ts4800-gpio", },
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{},
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};
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static struct platform_driver ts4800_gpio_driver = {
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.driver = {
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.name = "ts4800-gpio",
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.of_match_table = ts4800_gpio_of_match,
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},
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.probe = ts4800_gpio_probe,
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.remove = ts4800_gpio_remove,
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};
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module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);
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MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");
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MODULE_DESCRIPTION("TS4800 FPGA GPIO driver");
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MODULE_LICENSE("GPL v2");
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