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+/*
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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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+
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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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+
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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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+
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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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+
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+ return ops->pin_config_get(pctldev, pin, config);
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+
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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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+
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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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+
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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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+
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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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+ /*
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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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+ /*
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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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+
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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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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(pin_config_group_set);
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+
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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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+
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+#ifdef CONFIG_DEBUG_FS
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ seq_printf(s, "pin %d (%s):", pin,
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+ desc->name ? desc->name : "unnamed");
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+
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+ pinconf_dump_pin(pctldev, s, pin);
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+
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+ seq_printf(s, "\n");
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+ }
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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+ if (!ops || !ops->pin_config_group_get)
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+ return 0;
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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+#endif
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Linus Walleij