| /* |
| * Copyright (C) 2014-2015 Freescale Semiconductor, Inc. All Rights Reserved. |
| * |
| * The code contained herein is licensed under the GNU General Public |
| * License. You may obtain a copy of the GNU General Public License |
| * Version 2 or later at the following locations: |
| * |
| * http://www.opensource.org/licenses/gpl-license.html |
| * http://www.gnu.org/copyleft/gpl.html |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| |
| #define DRIVER_NAME "hannstar-cabc" |
| |
| static const struct of_device_id cabc_dt_ids[] = { |
| { .compatible = "hannstar,cabc", }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, cabc_dt_ids); |
| |
| static int cabc_probe(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node, *pp; |
| int cabc_gpio, ret = 0; |
| bool cabc_enable; |
| unsigned long gpio_flag; |
| enum of_gpio_flags flags; |
| |
| for_each_child_of_node(np, pp) { |
| if (!of_find_property(pp, "gpios", NULL)) { |
| dev_warn(&pdev->dev, "Found interface without " |
| "gpios\n"); |
| continue; |
| } |
| |
| cabc_gpio = of_get_gpio_flags(pp, 0, &flags); |
| if (!gpio_is_valid(cabc_gpio)) { |
| ret = cabc_gpio; |
| if (ret != -EPROBE_DEFER) |
| dev_err(&pdev->dev, |
| "Failed to get gpio flags, " |
| "error: %d\n", ret); |
| return ret; |
| } |
| |
| cabc_enable = of_property_read_bool(pp, "cabc-enable"); |
| |
| if (flags & OF_GPIO_ACTIVE_LOW) |
| gpio_flag = cabc_enable ? |
| GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH; |
| else |
| gpio_flag = cabc_enable ? |
| GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; |
| |
| devm_gpio_request_one(&pdev->dev, cabc_gpio, |
| gpio_flag, "hannstar-cabc"); |
| } |
| |
| return ret; |
| } |
| |
| static struct platform_driver cabc_driver = { |
| .probe = cabc_probe, |
| .driver = { |
| .of_match_table = cabc_dt_ids, |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| module_platform_driver(cabc_driver); |
| |
| MODULE_AUTHOR("Freescale Semiconductor, Inc."); |
| MODULE_DESCRIPTION("Hannstar CABC driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:" DRIVER_NAME); |