![Stephen Warren](/assets/img/avatar_default.png)
Pin controllers should already be instantiated as a device, so there's no need for the pinctrl core to create a new struct device for each controller. This allows the controller's real name to be used in the mux mapping table, rather than e.g. "pinctrl.0", "pinctrl.1", etc. This necessitates removal of the PINMUX_MAP_PRIMARY*() macros, since their sole purpose was to hard-code the .ctrl_dev_name field to be "pinctrl.0". Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
303 lines
7.7 KiB
C
303 lines
7.7 KiB
C
/*
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* Core driver for the pin config portions of the pin control subsystem
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*
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* Copyright (C) 2011 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) "pinconfig core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinconf.h>
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#include "core.h"
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#include "pinconf.h"
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int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long *config)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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if (!ops || !ops->pin_config_get) {
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dev_err(pctldev->dev, "cannot get pin configuration, missing "
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"pin_config_get() function in driver\n");
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return -EINVAL;
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}
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return ops->pin_config_get(pctldev, pin, config);
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}
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/**
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* pin_config_get() - get the configuration of a single pin parameter
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* @pctldev: pin controller device for this pin
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* @name: name of the pin to get the config for
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* @config: the config pointed to by this argument will be filled in with the
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* current pin state, it can be used directly by drivers as a numeral, or
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* it can be dereferenced to any struct.
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*/
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int pin_config_get(struct pinctrl_dev *pctldev, const char *name,
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unsigned long *config)
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{
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int pin;
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pin = pin_get_from_name(pctldev, name);
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if (pin < 0)
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return pin;
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return pin_config_get_for_pin(pctldev, pin, config);
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}
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EXPORT_SYMBOL(pin_config_get);
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int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long config)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int ret;
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if (!ops || !ops->pin_config_set) {
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dev_err(pctldev->dev, "cannot configure pin, missing "
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"config function in driver\n");
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return -EINVAL;
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}
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ret = ops->pin_config_set(pctldev, pin, config);
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if (ret) {
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dev_err(pctldev->dev,
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"unable to set pin configuration on pin %d\n", pin);
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return ret;
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}
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return 0;
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}
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/**
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* pin_config_set() - set the configuration of a single pin parameter
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* @pctldev: pin controller device for this pin
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* @name: name of the pin to set the config for
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* @config: the config in this argument will contain the desired pin state, it
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* can be used directly by drivers as a numeral, or it can be dereferenced
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* to any struct.
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*/
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int pin_config_set(struct pinctrl_dev *pctldev, const char *name,
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unsigned long config)
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{
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int pin;
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pin = pin_get_from_name(pctldev, name);
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if (pin < 0)
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return pin;
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return pin_config_set_for_pin(pctldev, pin, config);
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}
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EXPORT_SYMBOL(pin_config_set);
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int pin_config_group_get(struct pinctrl_dev *pctldev, const char *pin_group,
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unsigned long *config)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int selector;
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if (!ops || !ops->pin_config_group_get) {
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dev_err(pctldev->dev, "cannot get configuration for pin "
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"group, missing group config get function in "
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"driver\n");
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return -EINVAL;
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}
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selector = pinctrl_get_group_selector(pctldev, pin_group);
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if (selector < 0)
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return selector;
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return ops->pin_config_group_get(pctldev, selector, config);
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}
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EXPORT_SYMBOL(pin_config_group_get);
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int pin_config_group_set(struct pinctrl_dev *pctldev, const char *pin_group,
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unsigned long config)
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{
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int selector;
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const unsigned *pins;
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unsigned num_pins;
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int ret;
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int i;
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if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
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dev_err(pctldev->dev, "cannot configure pin group, missing "
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"config function in driver\n");
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return -EINVAL;
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}
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selector = pinctrl_get_group_selector(pctldev, pin_group);
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if (selector < 0)
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return selector;
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ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
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if (ret) {
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dev_err(pctldev->dev, "cannot configure pin group, error "
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"getting pins\n");
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return ret;
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}
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/*
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* If the pin controller supports handling entire groups we use that
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* capability.
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*/
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if (ops->pin_config_group_set) {
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ret = ops->pin_config_group_set(pctldev, selector, config);
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/*
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* If the pin controller prefer that a certain group be handled
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* pin-by-pin as well, it returns -EAGAIN.
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*/
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if (ret != -EAGAIN)
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return ret;
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}
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/*
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* If the controller cannot handle entire groups, we configure each pin
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* individually.
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*/
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if (!ops->pin_config_set)
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return 0;
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for (i = 0; i < num_pins; i++) {
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ret = ops->pin_config_set(pctldev, pins[i], config);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL(pin_config_group_set);
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int pinconf_check_ops(const struct pinconf_ops *ops)
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{
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/* We must be able to read out pin status */
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if (!ops->pin_config_get && !ops->pin_config_group_get)
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return -EINVAL;
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/* We have to be able to config the pins in SOME way */
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if (!ops->pin_config_set && !ops->pin_config_group_set)
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return -EINVAL;
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return 0;
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}
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#ifdef CONFIG_DEBUG_FS
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static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
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struct seq_file *s, int pin)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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if (ops && ops->pin_config_dbg_show)
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ops->pin_config_dbg_show(pctldev, s, pin);
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}
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static int pinconf_pins_show(struct seq_file *s, void *what)
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{
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struct pinctrl_dev *pctldev = s->private;
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unsigned pin;
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seq_puts(s, "Pin config settings per pin\n");
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seq_puts(s, "Format: pin (name): pinmux setting array\n");
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/* The highest pin number need to be included in the loop, thus <= */
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for (pin = 0; pin <= pctldev->desc->maxpin; pin++) {
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struct pin_desc *desc;
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desc = pin_desc_get(pctldev, pin);
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/* Pin space may be sparse */
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if (desc == NULL)
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continue;
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seq_printf(s, "pin %d (%s):", pin,
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desc->name ? desc->name : "unnamed");
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pinconf_dump_pin(pctldev, s, pin);
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seq_printf(s, "\n");
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}
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return 0;
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}
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static void pinconf_dump_group(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned selector,
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const char *gname)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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if (ops && ops->pin_config_group_dbg_show)
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ops->pin_config_group_dbg_show(pctldev, s, selector);
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}
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static int pinconf_groups_show(struct seq_file *s, void *what)
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{
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struct pinctrl_dev *pctldev = s->private;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinconf_ops *ops = pctldev->desc->confops;
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unsigned selector = 0;
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if (!ops || !ops->pin_config_group_get)
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return 0;
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seq_puts(s, "Pin config settings per pin group\n");
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seq_puts(s, "Format: group (name): pinmux setting array\n");
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while (pctlops->list_groups(pctldev, selector) >= 0) {
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const char *gname = pctlops->get_group_name(pctldev, selector);
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seq_printf(s, "%u (%s):", selector, gname);
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pinconf_dump_group(pctldev, s, selector, gname);
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selector++;
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}
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return 0;
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}
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static int pinconf_pins_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pinconf_pins_show, inode->i_private);
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}
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static int pinconf_groups_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pinconf_groups_show, inode->i_private);
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}
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static const struct file_operations pinconf_pins_ops = {
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.open = pinconf_pins_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static const struct file_operations pinconf_groups_ops = {
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.open = pinconf_groups_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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void pinconf_init_device_debugfs(struct dentry *devroot,
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struct pinctrl_dev *pctldev)
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{
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debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
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devroot, pctldev, &pinconf_pins_ops);
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debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
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devroot, pctldev, &pinconf_groups_ops);
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}
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#endif
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