1 /* 2 * CLPS711X GPIO driver 3 * 4 * Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/err.h> 13 #include <linux/module.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/platform_device.h> 16 17 static int clps711x_gpio_probe(struct platform_device *pdev) 18 { 19 struct device_node *np = pdev->dev.of_node; 20 void __iomem *dat, *dir; 21 struct gpio_chip *gc; 22 struct resource *res; 23 int err, id; 24 25 if (!np) 26 return -ENODEV; 27 28 id = of_alias_get_id(np, "gpio"); 29 if ((id < 0) || (id > 4)) 30 return -ENODEV; 31 32 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); 33 if (!gc) 34 return -ENOMEM; 35 36 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 37 dat = devm_ioremap_resource(&pdev->dev, res); 38 if (IS_ERR(dat)) 39 return PTR_ERR(dat); 40 41 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 42 dir = devm_ioremap_resource(&pdev->dev, res); 43 if (IS_ERR(dir)) 44 return PTR_ERR(dir); 45 46 switch (id) { 47 case 3: 48 /* PORTD is inverted logic for direction register */ 49 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 50 NULL, dir, 0); 51 break; 52 default: 53 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 54 dir, NULL, 0); 55 break; 56 } 57 58 if (err) 59 return err; 60 61 switch (id) { 62 case 4: 63 /* PORTE is 3 lines only */ 64 gc->ngpio = 3; 65 break; 66 default: 67 break; 68 } 69 70 gc->base = -1; 71 gc->owner = THIS_MODULE; 72 platform_set_drvdata(pdev, gc); 73 74 return devm_gpiochip_add_data(&pdev->dev, gc, NULL); 75 } 76 77 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = { 78 { .compatible = "cirrus,ep7209-gpio" }, 79 { } 80 }; 81 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids); 82 83 static struct platform_driver clps711x_gpio_driver = { 84 .driver = { 85 .name = "clps711x-gpio", 86 .of_match_table = of_match_ptr(clps711x_gpio_ids), 87 }, 88 .probe = clps711x_gpio_probe, 89 }; 90 module_platform_driver(clps711x_gpio_driver); 91 92 MODULE_LICENSE("GPL"); 93 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 94 MODULE_DESCRIPTION("CLPS711X GPIO driver"); 95 MODULE_ALIAS("platform:clps711x-gpio"); 96