| 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 | .owner = THIS_MODULE, |
| 91 | .of_match_table = of_match_ptr(clps711x_gpio_ids), |
| 92 | }, |
| 93 | .probe = clps711x_gpio_probe, |
| 94 | .remove = clps711x_gpio_remove, |
| 95 | }; |
| 96 | module_platform_driver(clps711x_gpio_driver); |
| 97 | |
| 98 | MODULE_LICENSE("GPL"); |
| 99 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); |
| 100 | MODULE_DESCRIPTION("CLPS711X GPIO driver"); |
| 101 | MODULE_ALIAS("platform:clps711x-gpio"); |