| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | struct resource *res; |
| 23 | int err, id; |
| 24 | |
| 25 | if (!np) |
| 26 | return -ENODEV; |
| 27 | |
| 28 | id = of_alias_get_id(np, "gpio"); |
| 29 | if ((id < 0) || (id > 4)) |
| 30 | return -ENODEV; |
| 31 | |
| 32 | gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); |
| 33 | if (!gc) |
| 34 | return -ENOMEM; |
| 35 | |
| 36 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 37 | dat = devm_ioremap_resource(&pdev->dev, res); |
| 38 | if (IS_ERR(dat)) |
| 39 | return PTR_ERR(dat); |
| 40 | |
| 41 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 42 | dir = devm_ioremap_resource(&pdev->dev, res); |
| 43 | if (IS_ERR(dir)) |
| 44 | return PTR_ERR(dir); |
| 45 | |
| 46 | switch (id) { |
| 47 | case 3: |
| 48 | /* PORTD is inverted logic for direction register */ |
| 49 | err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, |
| 50 | NULL, dir, 0); |
| 51 | break; |
| 52 | default: |
| 53 | err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL, |
| 54 | dir, NULL, 0); |
| 55 | break; |
| 56 | } |
| 57 | |
| 58 | if (err) |
| 59 | return err; |
| 60 | |
| 61 | switch (id) { |
| 62 | case 4: |
| 63 | /* PORTE is 3 lines only */ |
| 64 | gc->ngpio = 3; |
| 65 | break; |
| 66 | default: |
| 67 | break; |
| 68 | } |
| 69 | |
| 70 | gc->base = -1; |
| 71 | gc->owner = THIS_MODULE; |
| 72 | platform_set_drvdata(pdev, gc); |
| 73 | |
| 74 | return devm_gpiochip_add_data(&pdev->dev, gc, NULL); |
| 75 | } |
| 76 | |
| 77 | static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = { |
| 78 | { .compatible = "cirrus,ep7209-gpio" }, |
| 79 | { } |
| 80 | }; |
| 81 | MODULE_DEVICE_TABLE(of, clps711x_gpio_ids); |
| 82 | |
| 83 | static struct platform_driver clps711x_gpio_driver = { |
| 84 | .driver = { |
| 85 | .name = "clps711x-gpio", |
| 86 | .of_match_table = of_match_ptr(clps711x_gpio_ids), |
| 87 | }, |
| 88 | .probe = clps711x_gpio_probe, |
| 89 | }; |
| 90 | module_platform_driver(clps711x_gpio_driver); |
| 91 | |
| 92 | MODULE_LICENSE("GPL"); |
| 93 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); |
| 94 | MODULE_DESCRIPTION("CLPS711X GPIO driver"); |
| 95 | MODULE_ALIAS("platform:clps711x-gpio"); |