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 struct device_node *np = pdev->dev.of_node; 21 void __iomem *dat, *dir; 22 struct bgpio_chip *bgc; 23 struct resource *res; 24 int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id; 25 26 if ((id < 0) || (id > 4)) 27 return -ENODEV; 28 29 bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL); 30 if (!bgc) 31 return -ENOMEM; 32 33 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 34 dat = devm_ioremap_resource(&pdev->dev, res); 35 if (IS_ERR(dat)) 36 return PTR_ERR(dat); 37 38 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 39 dir = devm_ioremap_resource(&pdev->dev, res); 40 if (IS_ERR(dir)) 41 return PTR_ERR(dir); 42 43 switch (id) { 44 case 3: 45 /* PORTD is inverted logic for direction register */ 46 err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL, 47 NULL, dir, 0); 48 break; 49 default: 50 err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL, 51 dir, NULL, 0); 52 break; 53 } 54 55 if (err) 56 return err; 57 58 switch (id) { 59 case 4: 60 /* PORTE is 3 lines only */ 61 bgc->gc.ngpio = 3; 62 break; 63 default: 64 break; 65 } 66 67 bgc->gc.base = id * 8; 68 bgc->gc.owner = THIS_MODULE; 69 platform_set_drvdata(pdev, bgc); 70 71 return gpiochip_add(&bgc->gc); 72 } 73 74 static int clps711x_gpio_remove(struct platform_device *pdev) 75 { 76 struct bgpio_chip *bgc = platform_get_drvdata(pdev); 77 78 return bgpio_remove(bgc); 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