blob: 67a274e8672703bc17bb57e96f3262b4effe184e [file] [log] [blame]
Linus Walleijab780292013-01-22 10:56:14 -07001/*
2 * Driver core interface to the pinctrl subsystem.
3 *
4 * Copyright (C) 2012 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 * Based on bits of regulator core, gpio core and clk core
7 *
8 * Author: Linus Walleij <linus.walleij@linaro.org>
9 *
10 * License terms: GNU General Public License (GPL) version 2
11 */
12
13#include <linux/device.h>
14#include <linux/pinctrl/devinfo.h>
15#include <linux/pinctrl/consumer.h>
16#include <linux/slab.h>
17
18/**
19 * pinctrl_bind_pins() - called by the device core before probe
20 * @dev: the device that is just about to probe
21 */
22int pinctrl_bind_pins(struct device *dev)
23{
24 int ret;
25
26 dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
27 if (!dev->pins)
28 return -ENOMEM;
29
30 dev->pins->p = devm_pinctrl_get(dev);
31 if (IS_ERR(dev->pins->p)) {
32 dev_dbg(dev, "no pinctrl handle\n");
33 ret = PTR_ERR(dev->pins->p);
34 goto cleanup_alloc;
35 }
36
37 dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
38 PINCTRL_STATE_DEFAULT);
39 if (IS_ERR(dev->pins->default_state)) {
40 dev_dbg(dev, "no default pinctrl state\n");
41 ret = 0;
42 goto cleanup_get;
43 }
44
45 ret = pinctrl_select_state(dev->pins->p, dev->pins->default_state);
46 if (ret) {
47 dev_dbg(dev, "failed to activate default pinctrl state\n");
48 goto cleanup_get;
49 }
50
51 return 0;
52
53 /*
54 * If no pinctrl handle or default state was found for this device,
55 * let's explicitly free the pin container in the device, there is
56 * no point in keeping it around.
57 */
58cleanup_get:
59 devm_pinctrl_put(dev->pins->p);
60cleanup_alloc:
61 devm_kfree(dev, dev->pins);
62 dev->pins = NULL;
63
64 /* Only return deferrals */
65 if (ret != -EPROBE_DEFER)
66 ret = 0;
67
68 return ret;
69}