projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3bb16560 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 5041e791 JG |
2 | /* |
| 3 | * GPIO driver for the TS-4800 board | |
| 4 | * | |
| 5 | * Copyright (c) 2016 - Savoir-faire Linux | |
| 5041e791 JG |
6 | */ |
| 7 | ||
| 8 | #include <linux/gpio/driver.h> | |
| 7de9a6c7 | 9 | #include <linux/module.h> |
| e91d0f05 | 10 | #include <linux/of.h> |
| 5041e791 JG |
11 | #include <linux/platform_device.h> |
| 12 | ||
| 13 | #define DEFAULT_PIN_NUMBER 16 | |
| 14 | #define INPUT_REG_OFFSET 0x00 | |
| 15 | #define OUTPUT_REG_OFFSET 0x02 | |
| 16 | #define DIRECTION_REG_OFFSET 0x04 | |
| 17 | ||
| 18 | static int ts4800_gpio_probe(struct platform_device *pdev) | |
| 19 | { | |
| 20 | struct device_node *node; | |
| 21 | struct gpio_chip *chip; | |
| 5041e791 JG |
22 | void __iomem *base_addr; |
| 23 | int retval; | |
| 24 | u32 ngpios; | |
| 25 | ||
| 26 | chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL); | |
| 27 | if (!chip) | |
| 28 | return -ENOMEM; | |
| 29 | ||
| f7a6e467 | 30 | base_addr = devm_platform_ioremap_resource(pdev, 0); |
| 5041e791 JG |
31 | if (IS_ERR(base_addr)) |
| 32 | return PTR_ERR(base_addr); | |
| 33 | ||
| 34 | node = pdev->dev.of_node; | |
| 35 | if (!node) | |
| 36 | return -EINVAL; | |
| 37 | ||
| 38 | retval = of_property_read_u32(node, "ngpios", &ngpios); | |
| 39 | if (retval == -EINVAL) | |
| 40 | ngpios = DEFAULT_PIN_NUMBER; | |
| 41 | else if (retval) | |
| 42 | return retval; | |
| 43 | ||
| 44 | retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET, | |
| 45 | base_addr + OUTPUT_REG_OFFSET, NULL, | |
| 047b2f62 | 46 | base_addr + DIRECTION_REG_OFFSET, NULL, 0); |
| 5041e791 JG |
47 | if (retval) { |
| 48 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
| 49 | return retval; | |
| 50 | } | |
| 51 | ||
| 5041e791 JG |
52 | chip->ngpio = ngpios; |
| 53 | ||
| 54 | platform_set_drvdata(pdev, chip); | |
| 55 | ||
| 33ba54ee | 56 | return devm_gpiochip_add_data(&pdev->dev, chip, NULL); |
| 5041e791 JG |
57 | } |
| 58 | ||
| 59 | static const struct of_device_id ts4800_gpio_of_match[] = { | |
| 60 | { .compatible = "technologic,ts4800-gpio", }, | |
| 61 | {}, | |
| 62 | }; | |
| 91f1551a | 63 | MODULE_DEVICE_TABLE(of, ts4800_gpio_of_match); |
| 5041e791 JG |
64 | |
| 65 | static struct platform_driver ts4800_gpio_driver = { | |
| 66 | .driver = { | |
| 67 | .name = "ts4800-gpio", | |
| 68 | .of_match_table = ts4800_gpio_of_match, | |
| 69 | }, | |
| 70 | .probe = ts4800_gpio_probe, | |
| 5041e791 JG |
71 | }; |
| 72 | ||
| 73 | module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe); | |
| 74 | ||
| 75 | MODULE_AUTHOR("Julien Grossholtz <[email protected]>"); | |
| 76 | MODULE_DESCRIPTION("TS4800 FPGA GPIO driver"); | |
| 77 | MODULE_LICENSE("GPL v2"); |