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 = np ? of_alias_get_id(np, "gpio") : pdev->id; 24 25 if ((id < 0) || (id > 4)) 26 return -ENODEV; 27 28 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); 29 if (!gc) 30 return -ENOMEM; 31 32 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 33 dat = devm_ioremap_resource(&pdev->dev, res); 34 if (IS_ERR(dat)) 35 return PTR_ERR(dat); 36 37 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 38 dir = devm_ioremap_resource(&pdev->dev, res); 39 if (IS_ERR(dir)) 40 return PTR_ERR(dir); 41 42 switch (id) { 43 case 3: 44 /* PORTD is inverted logic for direction register */ 45 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 46 NULL, dir, 0); 47 break; 48 default: 49 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 50 dir, NULL, 0); 51 break; 52 } 53 54 if (err) 55 return err; 56 57 switch (id) { 58 case 4: 59 /* PORTE is 3 lines only */ 60 gc->ngpio = 3; 61 break; 62 default: 63 break; 64 } 65 66 gc->base = id * 8; 67 gc->owner = THIS_MODULE; 68 platform_set_drvdata(pdev, gc); 69 70 return gpiochip_add_data(gc, NULL); 71 } 72 73 static int clps711x_gpio_remove(struct platform_device *pdev) 74 { 75 struct gpio_chip *gc = platform_get_drvdata(pdev); 76 77 gpiochip_remove(gc); 78 return 0; 79 } 80 81 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = { 82 { .compatible = "cirrus,clps711x-gpio" }, 83 { } 84 }; 85 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids); 86 87 static struct platform_driver clps711x_gpio_driver = { 88 .driver = { 89 .name = "clps711x-gpio", 90 .of_match_table = of_match_ptr(clps711x_gpio_ids), 91 }, 92 .probe = clps711x_gpio_probe, 93 .remove = clps711x_gpio_remove, 94 }; 95 module_platform_driver(clps711x_gpio_driver); 96 97 MODULE_LICENSE("GPL"); 98 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 99 MODULE_DESCRIPTION("CLPS711X GPIO driver"); 100 MODULE_ALIAS("platform:clps711x-gpio"); 101