1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * CLPS711X GPIO driver
4 *
5 * Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
6 */
7
8 #include <linux/err.h>
9 #include <linux/module.h>
10 #include <linux/gpio/driver.h>
11 #include <linux/gpio/generic.h>
12 #include <linux/platform_device.h>
13
clps711x_gpio_probe(struct platform_device * pdev)14 static int clps711x_gpio_probe(struct platform_device *pdev)
15 {
16 struct gpio_generic_chip_config config = { };
17 struct device_node *np = pdev->dev.of_node;
18 struct gpio_generic_chip *gen_gc;
19 void __iomem *dat, *dir;
20 int err, id;
21
22 if (!np)
23 return -ENODEV;
24
25 id = of_alias_get_id(np, "gpio");
26 if ((id < 0) || (id > 4))
27 return -ENODEV;
28
29 gen_gc = devm_kzalloc(&pdev->dev, sizeof(*gen_gc), GFP_KERNEL);
30 if (!gen_gc)
31 return -ENOMEM;
32
33 dat = devm_platform_ioremap_resource(pdev, 0);
34 if (IS_ERR(dat))
35 return PTR_ERR(dat);
36
37 dir = devm_platform_ioremap_resource(pdev, 1);
38 if (IS_ERR(dir))
39 return PTR_ERR(dir);
40
41 config.dev = &pdev->dev;
42 config.sz = 1;
43 config.dat = dat;
44
45 switch (id) {
46 case 3:
47 /* PORTD is inverted logic for direction register */
48 config.dirin = dir;
49 break;
50 default:
51 config.dirout = dir;
52 break;
53 }
54
55 err = gpio_generic_chip_init(gen_gc, &config);
56 if (err)
57 return err;
58
59 switch (id) {
60 case 4:
61 /* PORTE is 3 lines only */
62 gen_gc->gc.ngpio = 3;
63 break;
64 default:
65 break;
66 }
67
68 gen_gc->gc.base = -1;
69 gen_gc->gc.owner = THIS_MODULE;
70
71 return devm_gpiochip_add_data(&pdev->dev, &gen_gc->gc, NULL);
72 }
73
74 static const struct of_device_id clps711x_gpio_ids[] = {
75 { .compatible = "cirrus,ep7209-gpio" },
76 { }
77 };
78 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
79
80 static struct platform_driver clps711x_gpio_driver = {
81 .driver = {
82 .name = "clps711x-gpio",
83 .of_match_table = clps711x_gpio_ids,
84 },
85 .probe = clps711x_gpio_probe,
86 };
87 module_platform_driver(clps711x_gpio_driver);
88
89 MODULE_LICENSE("GPL");
90 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
91 MODULE_DESCRIPTION("CLPS711X GPIO driver");
92 MODULE_ALIAS("platform:clps711x-gpio");
93