projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0299b77b JJ |
1 | /* |
| 2 | * MOXA ART SoCs GPIO driver. | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Jonas Jensen | |
| 5 | * | |
| 6 | * Jonas Jensen <jonas.jensen@gmail.com> | |
| 7 | * | |
| 8 | * This file is licensed under the terms of the GNU General Public | |
| 9 | * License version 2. This program is licensed "as is" without any | |
| 10 | * warranty of any kind, whether express or implied. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/err.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/irq.h> | |
| 16 | #include <linux/io.h> | |
| 0299b77b | 17 | #include <linux/platform_device.h> |
| 0299b77b JJ |
18 | #include <linux/of_address.h> |
| 19 | #include <linux/of_gpio.h> | |
| 20 | #include <linux/pinctrl/consumer.h> | |
| 21 | #include <linux/delay.h> | |
| 22 | #include <linux/timer.h> | |
| 23 | #include <linux/bitops.h> | |
| 0f4630f3 | 24 | #include <linux/gpio/driver.h> |
| 0299b77b JJ |
25 | |
| 26 | #define GPIO_DATA_OUT 0x00 | |
| 27 | #define GPIO_DATA_IN 0x04 | |
| 28 | #define GPIO_PIN_DIRECTION 0x08 | |
| 29 | ||
| 0299b77b JJ |
30 | static int moxart_gpio_probe(struct platform_device *pdev) |
| 31 | { | |
| 32 | struct device *dev = &pdev->dev; | |
| 33 | struct resource *res; | |
| 0f4630f3 | 34 | struct gpio_chip *gc; |
| 3c01b9a8 | 35 | void __iomem *base; |
| 0299b77b JJ |
36 | int ret; |
| 37 | ||
| 0f4630f3 LW |
38 | gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); |
| 39 | if (!gc) | |
| 0299b77b | 40 | return -ENOMEM; |
| 0299b77b JJ |
41 | |
| 42 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 3c01b9a8 KP |
43 | base = devm_ioremap_resource(dev, res); |
| 44 | if (IS_ERR(base)) | |
| 45 | return PTR_ERR(base); | |
| 0299b77b | 46 | |
| 0f4630f3 | 47 | ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN, |
| f3066339 VZ |
48 | base + GPIO_DATA_OUT, NULL, |
| 49 | base + GPIO_PIN_DIRECTION, NULL, | |
| 50 | BGPIOF_READ_OUTPUT_REG_SET); | |
| 3c01b9a8 KP |
51 | if (ret) { |
| 52 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
| 53 | return ret; | |
| 54 | } | |
| 0299b77b | 55 | |
| 0f4630f3 LW |
56 | gc->label = "moxart-gpio"; |
| 57 | gc->request = gpiochip_generic_request; | |
| 58 | gc->free = gpiochip_generic_free; | |
| 0f4630f3 | 59 | gc->base = 0; |
| 0f4630f3 | 60 | gc->owner = THIS_MODULE; |
| 3c01b9a8 | 61 | |
| 33bde5c5 | 62 | ret = devm_gpiochip_add_data(dev, gc, NULL); |
| 0299b77b JJ |
63 | if (ret) { |
| 64 | dev_err(dev, "%s: gpiochip_add failed\n", | |
| 65 | dev->of_node->full_name); | |
| 66 | return ret; | |
| 67 | } | |
| 68 | ||
| 3c01b9a8 | 69 | return ret; |
| 0299b77b JJ |
70 | } |
| 71 | ||
| 72 | static const struct of_device_id moxart_gpio_match[] = { | |
| 73 | { .compatible = "moxa,moxart-gpio" }, | |
| 74 | { } | |
| 75 | }; | |
| 76 | ||
| 77 | static struct platform_driver moxart_gpio_driver = { | |
| 78 | .driver = { | |
| 79 | .name = "moxart-gpio", | |
| 0299b77b JJ |
80 | .of_match_table = moxart_gpio_match, |
| 81 | }, | |
| 82 | .probe = moxart_gpio_probe, | |
| 83 | }; | |
| 4bb9f725 | 84 | builtin_platform_driver(moxart_gpio_driver); |