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/gpio.h> 14 #include <linux/module.h> 15 #include <linux/basic_mmio_gpio.h> 16 #include <linux/platform_device.h> 17 18 static int clps711x_gpio_probe(struct platform_device *pdev) 19 { 20 void __iomem *dat, *dir; 21 struct bgpio_chip *bgc; 22 struct resource *res; 23 int err, id = pdev->id; 24 25 if ((id < 0) || (id > 4)) 26 return -ENODEV; 27 28 bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL); 29 if (!bgc) 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(bgc, &pdev->dev, 1, dat, NULL, NULL, 46 NULL, dir, 0); 47 break; 48 default: 49 err = bgpio_init(bgc, &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 bgc->gc.ngpio = 3; 61 break; 62 default: 63 break; 64 } 65 66 bgc->gc.base = id * 8; 67 platform_set_drvdata(pdev, bgc); 68 69 return gpiochip_add(&bgc->gc); 70 } 71 72 static int clps711x_gpio_remove(struct platform_device *pdev) 73 { 74 struct bgpio_chip *bgc = platform_get_drvdata(pdev); 75 76 return bgpio_remove(bgc); 77 } 78 79 static struct platform_driver clps711x_gpio_driver = { 80 .driver = { 81 .name = "clps711x-gpio", 82 .owner = THIS_MODULE, 83 }, 84 .probe = clps711x_gpio_probe, 85 .remove = clps711x_gpio_remove, 86 }; 87 module_platform_driver(clps711x_gpio_driver); 88 89 MODULE_LICENSE("GPL"); 90 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 91 MODULE_DESCRIPTION("CLPS711X GPIO driver"); 92