90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Copyright (C) 2014 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#define DRIVER_NAME "hannstar-cabc"
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static const struct of_device_id cabc_dt_ids[] = {
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{ .compatible = "hannstar,cabc", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, cabc_dt_ids);
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static int cabc_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node, *pp;
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int cabc_gpio, ret = 0;
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bool cabc_enable;
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unsigned long gpio_flag;
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enum of_gpio_flags flags;
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for_each_child_of_node(np, pp) {
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if (!of_find_property(pp, "gpios", NULL)) {
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dev_warn(&pdev->dev, "Found interface without "
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"gpios\n");
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continue;
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}
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cabc_gpio = of_get_gpio_flags(pp, 0, &flags);
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if (!gpio_is_valid(cabc_gpio)) {
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ret = cabc_gpio;
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Failed to get gpio flags, "
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"error: %d\n", ret);
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return ret;
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}
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cabc_enable = of_property_read_bool(pp, "cabc-enable");
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if (flags & OF_GPIO_ACTIVE_LOW)
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gpio_flag = cabc_enable ?
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GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
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else
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gpio_flag = cabc_enable ?
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GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
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devm_gpio_request_one(&pdev->dev, cabc_gpio,
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gpio_flag, "hannstar-cabc");
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}
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return ret;
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}
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static struct platform_driver cabc_driver = {
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.probe = cabc_probe,
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.driver = {
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.of_match_table = cabc_dt_ids,
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(cabc_driver);
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_DESCRIPTION("Hannstar CABC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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