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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> |
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10 | #include <linux/of_address.h> |
11 | #include <linux/of_device.h> | |
12 | #include <linux/platform_device.h> | |
13 | ||
14 | #define DEFAULT_PIN_NUMBER 16 | |
15 | #define INPUT_REG_OFFSET 0x00 | |
16 | #define OUTPUT_REG_OFFSET 0x02 | |
17 | #define DIRECTION_REG_OFFSET 0x04 | |
18 | ||
19 | static int ts4800_gpio_probe(struct platform_device *pdev) | |
20 | { | |
21 | struct device_node *node; | |
22 | struct gpio_chip *chip; | |
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23 | void __iomem *base_addr; |
24 | int retval; | |
25 | u32 ngpios; | |
26 | ||
27 | chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL); | |
28 | if (!chip) | |
29 | return -ENOMEM; | |
30 | ||
f7a6e467 | 31 | base_addr = devm_platform_ioremap_resource(pdev, 0); |
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32 | if (IS_ERR(base_addr)) |
33 | return PTR_ERR(base_addr); | |
34 | ||
35 | node = pdev->dev.of_node; | |
36 | if (!node) | |
37 | return -EINVAL; | |
38 | ||
39 | retval = of_property_read_u32(node, "ngpios", &ngpios); | |
40 | if (retval == -EINVAL) | |
41 | ngpios = DEFAULT_PIN_NUMBER; | |
42 | else if (retval) | |
43 | return retval; | |
44 | ||
45 | retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET, | |
46 | base_addr + OUTPUT_REG_OFFSET, NULL, | |
047b2f62 | 47 | base_addr + DIRECTION_REG_OFFSET, NULL, 0); |
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48 | if (retval) { |
49 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
50 | return retval; | |
51 | } | |
52 | ||
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53 | chip->ngpio = ngpios; |
54 | ||
55 | platform_set_drvdata(pdev, chip); | |
56 | ||
33ba54ee | 57 | return devm_gpiochip_add_data(&pdev->dev, chip, NULL); |
5041e791 JG |
58 | } |
59 | ||
60 | static const struct of_device_id ts4800_gpio_of_match[] = { | |
61 | { .compatible = "technologic,ts4800-gpio", }, | |
62 | {}, | |
63 | }; | |
91f1551a | 64 | MODULE_DEVICE_TABLE(of, ts4800_gpio_of_match); |
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65 | |
66 | static struct platform_driver ts4800_gpio_driver = { | |
67 | .driver = { | |
68 | .name = "ts4800-gpio", | |
69 | .of_match_table = ts4800_gpio_of_match, | |
70 | }, | |
71 | .probe = ts4800_gpio_probe, | |
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72 | }; |
73 | ||
74 | module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe); | |
75 | ||
76 | MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>"); | |
77 | MODULE_DESCRIPTION("TS4800 FPGA GPIO driver"); | |
78 | MODULE_LICENSE("GPL v2"); |