1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * CLPS711X GPIO driver 4 * 5 * Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/module.h> 10 #include <linux/gpio/driver.h> 11 #include <linux/platform_device.h> 12 13 static int clps711x_gpio_probe(struct platform_device *pdev) 14 { 15 struct device_node *np = pdev->dev.of_node; 16 void __iomem *dat, *dir; 17 struct gpio_chip *gc; 18 int err, id; 19 20 if (!np) 21 return -ENODEV; 22 23 id = of_alias_get_id(np, "gpio"); 24 if ((id < 0) || (id > 4)) 25 return -ENODEV; 26 27 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); 28 if (!gc) 29 return -ENOMEM; 30 31 dat = devm_platform_ioremap_resource(pdev, 0); 32 if (IS_ERR(dat)) 33 return PTR_ERR(dat); 34 35 dir = devm_platform_ioremap_resource(pdev, 1); 36 if (IS_ERR(dir)) 37 return PTR_ERR(dir); 38 39 switch (id) { 40 case 3: 41 /* PORTD is inverted logic for direction register */ 42 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 43 NULL, dir, 0); 44 break; 45 default: 46 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, 47 dir, NULL, 0); 48 break; 49 } 50 51 if (err) 52 return err; 53 54 switch (id) { 55 case 4: 56 /* PORTE is 3 lines only */ 57 gc->ngpio = 3; 58 break; 59 default: 60 break; 61 } 62 63 gc->base = -1; 64 gc->owner = THIS_MODULE; 65 platform_set_drvdata(pdev, gc); 66 67 return devm_gpiochip_add_data(&pdev->dev, gc, NULL); 68 } 69 70 static const struct of_device_id clps711x_gpio_ids[] = { 71 { .compatible = "cirrus,ep7209-gpio" }, 72 { } 73 }; 74 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids); 75 76 static struct platform_driver clps711x_gpio_driver = { 77 .driver = { 78 .name = "clps711x-gpio", 79 .of_match_table = clps711x_gpio_ids, 80 }, 81 .probe = clps711x_gpio_probe, 82 }; 83 module_platform_driver(clps711x_gpio_driver); 84 85 MODULE_LICENSE("GPL"); 86 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 87 MODULE_DESCRIPTION("CLPS711X GPIO driver"); 88 MODULE_ALIAS("platform:clps711x-gpio"); 89