projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ab78029e LW |
1 | /* |
| 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 <[email protected]> | |
| 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 | */ | |
| 22 | int 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 | ||
| 14005ee2 LW |
51 | #ifdef CONFIG_PM |
| 52 | /* | |
| 53 | * If power management is enabled, we also look for the optional | |
| 54 | * sleep and idle pin states, with semantics as defined in | |
| 55 | * <linux/pinctrl/pinctrl-state.h> | |
| 56 | */ | |
| 57 | dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p, | |
| 58 | PINCTRL_STATE_SLEEP); | |
| 59 | if (IS_ERR(dev->pins->sleep_state)) | |
| 60 | /* Not supplying this state is perfectly legal */ | |
| 61 | dev_dbg(dev, "no sleep pinctrl state\n"); | |
| 62 | ||
| 63 | dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p, | |
| 64 | PINCTRL_STATE_IDLE); | |
| 65 | if (IS_ERR(dev->pins->idle_state)) | |
| 66 | /* Not supplying this state is perfectly legal */ | |
| 67 | dev_dbg(dev, "no idle pinctrl state\n"); | |
| 68 | #endif | |
| 69 | ||
| ab78029e LW |
70 | return 0; |
| 71 | ||
| 72 | /* | |
| 73 | * If no pinctrl handle or default state was found for this device, | |
| 74 | * let's explicitly free the pin container in the device, there is | |
| 75 | * no point in keeping it around. | |
| 76 | */ | |
| 77 | cleanup_get: | |
| 78 | devm_pinctrl_put(dev->pins->p); | |
| 79 | cleanup_alloc: | |
| 80 | devm_kfree(dev, dev->pins); | |
| 81 | dev->pins = NULL; | |
| 82 | ||
| 83 | /* Only return deferrals */ | |
| 84 | if (ret != -EPROBE_DEFER) | |
| 85 | ret = 0; | |
| 86 | ||
| 87 | return ret; | |
| 88 | } |