projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5041e791 JG |
1 | /* |
| 2 | * GPIO driver for the TS-4800 board | |
| 3 | * | |
| 4 | * Copyright (c) 2016 - Savoir-faire Linux | |
| 5 | * | |
| 6 | * This file is licensed under the terms of the GNU General Public | |
| 7 | * License version 2. This program is licensed "as is" without any | |
| 8 | * warranty of any kind, whether express or implied. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/gpio/driver.h> | |
| 12 | #include <linux/of_address.h> | |
| 13 | #include <linux/of_device.h> | |
| 14 | #include <linux/platform_device.h> | |
| 15 | ||
| 16 | #define DEFAULT_PIN_NUMBER 16 | |
| 17 | #define INPUT_REG_OFFSET 0x00 | |
| 18 | #define OUTPUT_REG_OFFSET 0x02 | |
| 19 | #define DIRECTION_REG_OFFSET 0x04 | |
| 20 | ||
| 21 | static int ts4800_gpio_probe(struct platform_device *pdev) | |
| 22 | { | |
| 23 | struct device_node *node; | |
| 24 | struct gpio_chip *chip; | |
| 25 | struct resource *res; | |
| 26 | void __iomem *base_addr; | |
| 27 | int retval; | |
| 28 | u32 ngpios; | |
| 29 | ||
| 30 | chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL); | |
| 31 | if (!chip) | |
| 32 | return -ENOMEM; | |
| 33 | ||
| 34 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 35 | base_addr = devm_ioremap_resource(&pdev->dev, res); | |
| 36 | if (IS_ERR(base_addr)) | |
| 37 | return PTR_ERR(base_addr); | |
| 38 | ||
| 39 | node = pdev->dev.of_node; | |
| 40 | if (!node) | |
| 41 | return -EINVAL; | |
| 42 | ||
| 43 | retval = of_property_read_u32(node, "ngpios", &ngpios); | |
| 44 | if (retval == -EINVAL) | |
| 45 | ngpios = DEFAULT_PIN_NUMBER; | |
| 46 | else if (retval) | |
| 47 | return retval; | |
| 48 | ||
| 49 | retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET, | |
| 50 | base_addr + OUTPUT_REG_OFFSET, NULL, | |
| 047b2f62 | 51 | base_addr + DIRECTION_REG_OFFSET, NULL, 0); |
| 5041e791 JG |
52 | if (retval) { |
| 53 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
| 54 | return retval; | |
| 55 | } | |
| 56 | ||
| 5041e791 JG |
57 | chip->ngpio = ngpios; |
| 58 | ||
| 59 | platform_set_drvdata(pdev, chip); | |
| 60 | ||
| 33ba54ee | 61 | return devm_gpiochip_add_data(&pdev->dev, chip, NULL); |
| 5041e791 JG |
62 | } |
| 63 | ||
| 64 | static const struct of_device_id ts4800_gpio_of_match[] = { | |
| 65 | { .compatible = "technologic,ts4800-gpio", }, | |
| 66 | {}, | |
| 67 | }; | |
| 68 | ||
| 69 | static struct platform_driver ts4800_gpio_driver = { | |
| 70 | .driver = { | |
| 71 | .name = "ts4800-gpio", | |
| 72 | .of_match_table = ts4800_gpio_of_match, | |
| 73 | }, | |
| 74 | .probe = ts4800_gpio_probe, | |
| 5041e791 JG |
75 | }; |
| 76 | ||
| 77 | module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe); | |
| 78 | ||
| 79 | MODULE_AUTHOR("Julien Grossholtz <[email protected]>"); | |
| 80 | MODULE_DESCRIPTION("TS4800 FPGA GPIO driver"); | |
| 81 | MODULE_LICENSE("GPL v2"); |