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 int err, id; 23 24 if (!np) 25 return -ENODEV; 26 27 id = of_alias_get_id(np, "gpio"); 28 if ((id < 0) || (id > 4)) 29 return -ENODEV; 30 31 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); 32 if (!gc) 33 return -ENOMEM; 34 35 dat = devm_platform_ioremap_resource(pdev, 0); 36 if (IS_ERR(dat)) 37 return PTR_ERR(dat); 38 39 dir = devm_platform_ioremap_resource(pdev, 1); 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(gc, &pdev->dev, 1, dat, NULL, NULL, 47 NULL, dir, 0); 48 break; 49 default: 50 err = bgpio_init(gc, &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 gc->ngpio = 3; 62 break; 63 default: 64 break; 65 } 66 67 gc->base = -1; 68 gc->owner = THIS_MODULE; 69 platform_set_drvdata(pdev, gc); 70 71 return devm_gpiochip_add_data(&pdev->dev, gc, NULL); 72 } 73 74 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = { 75 { .compatible = "cirrus,ep7209-gpio" }, 76 { } 77 }; 78 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids); 79 80 static struct platform_driver clps711x_gpio_driver = { 81 .driver = { 82 .name = "clps711x-gpio", 83 .of_match_table = of_match_ptr(clps711x_gpio_ids), 84 }, 85 .probe = clps711x_gpio_probe, 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 MODULE_ALIAS("platform:clps711x-gpio"); 93