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 JJ |
17 | #include <linux/platform_device.h> |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/of_address.h> | |
| 20 | #include <linux/of_gpio.h> | |
| 21 | #include <linux/pinctrl/consumer.h> | |
| 22 | #include <linux/delay.h> | |
| 23 | #include <linux/timer.h> | |
| 24 | #include <linux/bitops.h> | |
| 0f4630f3 | 25 | #include <linux/gpio/driver.h> |
| 0299b77b JJ |
26 | |
| 27 | #define GPIO_DATA_OUT 0x00 | |
| 28 | #define GPIO_DATA_IN 0x04 | |
| 29 | #define GPIO_PIN_DIRECTION 0x08 | |
| 30 | ||
| 0299b77b JJ |
31 | static int moxart_gpio_probe(struct platform_device *pdev) |
| 32 | { | |
| 33 | struct device *dev = &pdev->dev; | |
| 34 | struct resource *res; | |
| 0f4630f3 | 35 | struct gpio_chip *gc; |
| 3c01b9a8 | 36 | void __iomem *base; |
| 0299b77b JJ |
37 | int ret; |
| 38 | ||
| 0f4630f3 LW |
39 | gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); |
| 40 | if (!gc) | |
| 0299b77b | 41 | return -ENOMEM; |
| 0299b77b JJ |
42 | |
| 43 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 3c01b9a8 KP |
44 | base = devm_ioremap_resource(dev, res); |
| 45 | if (IS_ERR(base)) | |
| 46 | return PTR_ERR(base); | |
| 0299b77b | 47 | |
| 0f4630f3 | 48 | ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN, |
| f3066339 VZ |
49 | base + GPIO_DATA_OUT, NULL, |
| 50 | base + GPIO_PIN_DIRECTION, NULL, | |
| 51 | BGPIOF_READ_OUTPUT_REG_SET); | |
| 3c01b9a8 KP |
52 | if (ret) { |
| 53 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
| 54 | return ret; | |
| 55 | } | |
| 0299b77b | 56 | |
| 0f4630f3 LW |
57 | gc->label = "moxart-gpio"; |
| 58 | gc->request = gpiochip_generic_request; | |
| 59 | gc->free = gpiochip_generic_free; | |
| 0f4630f3 | 60 | gc->base = 0; |
| 0f4630f3 | 61 | gc->owner = THIS_MODULE; |
| 3c01b9a8 | 62 | |
| 33bde5c5 | 63 | ret = devm_gpiochip_add_data(dev, gc, NULL); |
| 0299b77b JJ |
64 | if (ret) { |
| 65 | dev_err(dev, "%s: gpiochip_add failed\n", | |
| 66 | dev->of_node->full_name); | |
| 67 | return ret; | |
| 68 | } | |
| 69 | ||
| 3c01b9a8 | 70 | return ret; |
| 0299b77b JJ |
71 | } |
| 72 | ||
| 73 | static const struct of_device_id moxart_gpio_match[] = { | |
| 74 | { .compatible = "moxa,moxart-gpio" }, | |
| 75 | { } | |
| 76 | }; | |
| 77 | ||
| 78 | static struct platform_driver moxart_gpio_driver = { | |
| 79 | .driver = { | |
| 80 | .name = "moxart-gpio", | |
| 0299b77b JJ |
81 | .of_match_table = moxart_gpio_match, |
| 82 | }, | |
| 83 | .probe = moxart_gpio_probe, | |
| 84 | }; | |
| 85 | module_platform_driver(moxart_gpio_driver); | |
| 86 | ||
| 87 | MODULE_DESCRIPTION("MOXART GPIO chip driver"); | |
| 88 | MODULE_LICENSE("GPL"); | |
| 89 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |