2 * MOXA ART SoCs GPIO driver.
4 * Copyright (C) 2013 Jonas Jensen
6 * Jonas Jensen <jonas.jensen@gmail.com>
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.
13 #include <linux/err.h>
14 #include <linux/init.h>
15 #include <linux/irq.h>
17 #include <linux/gpio.h>
18 #include <linux/platform_device.h>
19 #include <linux/module.h>
20 #include <linux/of_address.h>
21 #include <linux/of_gpio.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/delay.h>
24 #include <linux/timer.h>
25 #include <linux/bitops.h>
26 #include <linux/basic_mmio_gpio.h>
28 #define GPIO_DATA_OUT 0x00
29 #define GPIO_DATA_IN 0x04
30 #define GPIO_PIN_DIRECTION 0x08
32 static int moxart_gpio_request(struct gpio_chip
*chip
, unsigned offset
)
34 return pinctrl_request_gpio(offset
);
37 static void moxart_gpio_free(struct gpio_chip
*chip
, unsigned offset
)
39 pinctrl_free_gpio(offset
);
42 static int moxart_gpio_probe(struct platform_device
*pdev
)
44 struct device
*dev
= &pdev
->dev
;
46 struct bgpio_chip
*bgc
;
50 bgc
= devm_kzalloc(dev
, sizeof(*bgc
), GFP_KERNEL
);
54 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
55 base
= devm_ioremap_resource(dev
, res
);
59 ret
= bgpio_init(bgc
, dev
, 4, base
+ GPIO_DATA_IN
,
60 base
+ GPIO_DATA_OUT
, NULL
,
61 base
+ GPIO_PIN_DIRECTION
, NULL
,
62 BGPIOF_READ_OUTPUT_REG_SET
);
64 dev_err(&pdev
->dev
, "bgpio_init failed\n");
68 bgc
->gc
.label
= "moxart-gpio";
69 bgc
->gc
.request
= moxart_gpio_request
;
70 bgc
->gc
.free
= moxart_gpio_free
;
71 bgc
->data
= bgc
->read_reg(bgc
->reg_set
);
75 bgc
->gc
.owner
= THIS_MODULE
;
77 ret
= gpiochip_add(&bgc
->gc
);
79 dev_err(dev
, "%s: gpiochip_add failed\n",
80 dev
->of_node
->full_name
);
87 static const struct of_device_id moxart_gpio_match
[] = {
88 { .compatible
= "moxa,moxart-gpio" },
92 static struct platform_driver moxart_gpio_driver
= {
94 .name
= "moxart-gpio",
95 .of_match_table
= moxart_gpio_match
,
97 .probe
= moxart_gpio_probe
,
99 module_platform_driver(moxart_gpio_driver
);
101 MODULE_DESCRIPTION("MOXART GPIO chip driver");
102 MODULE_LICENSE("GPL");
103 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");