1/*
2 * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
3 *
4 * Helper functions for S3C24XX/S3C64XX SoC series CAMIF driver
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/gpio.h>
12#include <plat/gpio-cfg.h>
13#include <mach/gpio-samsung.h>
14
15/* Number of camera port pins, without FIELD */
16#define S3C_CAMIF_NUM_GPIOS	13
17
18/* Default camera port configuration helpers. */
19
20static void camif_get_gpios(int *gpio_start, int *gpio_reset)
21{
22#ifdef CONFIG_ARCH_S3C24XX
23	*gpio_start = S3C2410_GPJ(0);
24	*gpio_reset = S3C2410_GPJ(12);
25#else
26	/* s3c64xx */
27	*gpio_start = S3C64XX_GPF(0);
28	*gpio_reset = S3C64XX_GPF(3);
29#endif
30}
31
32int s3c_camif_gpio_get(void)
33{
34	int gpio_start, gpio_reset;
35	int ret, i;
36
37	camif_get_gpios(&gpio_start, &gpio_reset);
38
39	for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
40		int gpio = gpio_start + i;
41
42		if (gpio == gpio_reset)
43			continue;
44
45		ret = gpio_request(gpio, "camif");
46		if (!ret)
47			ret = s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
48		if (ret) {
49			pr_err("failed to configure GPIO %d\n", gpio);
50			for (--i; i >= 0; i--)
51				gpio_free(gpio--);
52			return ret;
53		}
54		s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
55	}
56
57	return 0;
58}
59
60void s3c_camif_gpio_put(void)
61{
62	int i, gpio_start, gpio_reset;
63
64	camif_get_gpios(&gpio_start, &gpio_reset);
65
66	for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
67		int gpio = gpio_start + i;
68		if (gpio != gpio_reset)
69			gpio_free(gpio);
70	}
71}
72