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-rw-r--r--drivers/pinctrl/pinconf.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
new file mode 100644
index 0000000000..d9d5406547
--- /dev/null
+++ b/drivers/pinctrl/pinconf.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Core driver for the pin config portions of the pin control subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ */
+#define pr_fmt(fmt) "pinconfig core: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf.h>
+#include "core.h"
+#include "pinconf.h"
+
+int pinconf_check_ops(struct pinctrl_dev *pctldev)
+{
+ const struct pinconf_ops *ops = pctldev->desc->confops;
+
+ /* We have to be able to config the pins in SOME way */
+ if (!ops->pin_config_set && !ops->pin_config_group_set) {
+ dev_err(pctldev->dev,
+ "pinconf has to be able to set a pins config\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int pinconf_validate_map(const struct pinctrl_map *map, int i)
+{
+ if (!map->data.configs.group_or_pin) {
+ pr_err("failed to register map %s (%d): no group/pin given\n",
+ map->name, i);
+ return -EINVAL;
+ }
+
+ if (!map->data.configs.num_configs ||
+ !map->data.configs.configs) {
+ pr_err("failed to register map %s (%d): no configs given\n",
+ map->name, i);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *config)
+{
+ const struct pinconf_ops *ops = pctldev->desc->confops;
+
+ if (!ops || !ops->pin_config_get) {
+ dev_dbg(pctldev->dev,
+ "cannot get pin configuration, .pin_config_get missing in driver\n");
+ return -ENOTSUPP;
+ }
+
+ return ops->pin_config_get(pctldev, pin, config);
+}
+
+int pin_config_group_get(const char *dev_name, const char *pin_group,
+ unsigned long *config)
+{
+ struct pinctrl_dev *pctldev;
+ const struct pinconf_ops *ops;
+ int selector, ret;
+
+ pctldev = get_pinctrl_dev_from_devname(dev_name);
+ if (!pctldev) {
+ ret = -EINVAL;
+ return ret;
+ }
+
+ mutex_lock(&pctldev->mutex);
+
+ ops = pctldev->desc->confops;
+
+ if (!ops || !ops->pin_config_group_get) {
+ dev_dbg(pctldev->dev,
+ "cannot get configuration for pin group, missing group config get function in driver\n");
+ ret = -ENOTSUPP;
+ goto unlock;
+ }
+
+ selector = pinctrl_get_group_selector(pctldev, pin_group);
+ if (selector < 0) {
+ ret = selector;
+ goto unlock;
+ }
+
+ ret = ops->pin_config_group_get(pctldev, selector, config);
+
+unlock:
+ mutex_unlock(&pctldev->mutex);
+ return ret;
+}
+
+int pinconf_map_to_setting(const struct pinctrl_map *map,
+ struct pinctrl_setting *setting)
+{
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ int pin;
+
+ switch (setting->type) {
+ case PIN_MAP_TYPE_CONFIGS_PIN:
+ pin = pin_get_from_name(pctldev,
+ map->data.configs.group_or_pin);
+ if (pin < 0) {
+ dev_err(pctldev->dev, "could not map pin config for \"%s\"",
+ map->data.configs.group_or_pin);
+ return pin;
+ }
+ setting->data.configs.group_or_pin = pin;
+ break;
+ case PIN_MAP_TYPE_CONFIGS_GROUP:
+ pin = pinctrl_get_group_selector(pctldev,
+ map->data.configs.group_or_pin);
+ if (pin < 0) {
+ dev_err(pctldev->dev, "could not map group config for \"%s\"",
+ map->data.configs.group_or_pin);
+ return pin;
+ }
+ setting->data.configs.group_or_pin = pin;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ setting->data.configs.num_configs = map->data.configs.num_configs;
+ setting->data.configs.configs = map->data.configs.configs;
+
+ return 0;
+}
+
+void pinconf_free_setting(const struct pinctrl_setting *setting)
+{
+}
+
+int pinconf_apply_setting(const struct pinctrl_setting *setting)
+{
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinconf_ops *ops = pctldev->desc->confops;
+ int ret;
+
+ if (!ops) {
+ dev_err(pctldev->dev, "missing confops\n");
+ return -EINVAL;
+ }
+
+ switch (setting->type) {
+ case PIN_MAP_TYPE_CONFIGS_PIN:
+ if (!ops->pin_config_set) {
+ dev_err(pctldev->dev, "missing pin_config_set op\n");
+ return -EINVAL;
+ }
+ ret = ops->pin_config_set(pctldev,
+ setting->data.configs.group_or_pin,
+ setting->data.configs.configs,
+ setting->data.configs.num_configs);
+ if (ret < 0) {
+ dev_err(pctldev->dev,
+ "pin_config_set op failed for pin %d\n",
+ setting->data.configs.group_or_pin);
+ return ret;
+ }
+ break;
+ case PIN_MAP_TYPE_CONFIGS_GROUP:
+ if (!ops->pin_config_group_set) {
+ dev_err(pctldev->dev,
+ "missing pin_config_group_set op\n");
+ return -EINVAL;
+ }
+ ret = ops->pin_config_group_set(pctldev,
+ setting->data.configs.group_or_pin,
+ setting->data.configs.configs,
+ setting->data.configs.num_configs);
+ if (ret < 0) {
+ dev_err(pctldev->dev,
+ "pin_config_group_set op failed for group %d\n",
+ setting->data.configs.group_or_pin);
+ return ret;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *configs, size_t nconfigs)
+{
+ const struct pinconf_ops *ops;
+
+ ops = pctldev->desc->confops;
+ if (!ops || !ops->pin_config_set)
+ return -ENOTSUPP;
+
+ return ops->pin_config_set(pctldev, pin, configs, nconfigs);
+}
+
+#ifdef CONFIG_DEBUG_FS
+
+static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
+ unsigned long *configs, unsigned num_configs)
+{
+ const struct pinconf_ops *confops;
+ int i;
+
+ if (pctldev)
+ confops = pctldev->desc->confops;
+ else
+ confops = NULL;
+
+ for (i = 0; i < num_configs; i++) {
+ seq_puts(s, "config ");
+ if (confops && confops->pin_config_config_dbg_show)
+ confops->pin_config_config_dbg_show(pctldev, s,
+ configs[i]);
+ else
+ seq_printf(s, "%08lx", configs[i]);
+ seq_putc(s, '\n');
+ }
+}
+
+void pinconf_show_map(struct seq_file *s, const struct pinctrl_map *map)
+{
+ struct pinctrl_dev *pctldev;
+
+ pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
+
+ switch (map->type) {
+ case PIN_MAP_TYPE_CONFIGS_PIN:
+ seq_puts(s, "pin ");
+ break;
+ case PIN_MAP_TYPE_CONFIGS_GROUP:
+ seq_puts(s, "group ");
+ break;
+ default:
+ break;
+ }
+
+ seq_printf(s, "%s\n", map->data.configs.group_or_pin);
+
+ pinconf_show_config(s, pctldev, map->data.configs.configs,
+ map->data.configs.num_configs);
+}
+
+void pinconf_show_setting(struct seq_file *s,
+ const struct pinctrl_setting *setting)
+{
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ struct pin_desc *desc;
+
+ switch (setting->type) {
+ case PIN_MAP_TYPE_CONFIGS_PIN:
+ desc = pin_desc_get(setting->pctldev,
+ setting->data.configs.group_or_pin);
+ seq_printf(s, "pin %s (%d)", desc->name,
+ setting->data.configs.group_or_pin);
+ break;
+ case PIN_MAP_TYPE_CONFIGS_GROUP:
+ seq_printf(s, "group %s (%d)",
+ pctlops->get_group_name(pctldev,
+ setting->data.configs.group_or_pin),
+ setting->data.configs.group_or_pin);
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * FIXME: We should really get the pin controller to dump the config
+ * values, so they can be decoded to something meaningful.
+ */
+ pinconf_show_config(s, pctldev, setting->data.configs.configs,
+ setting->data.configs.num_configs);
+}
+
+static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
+ struct seq_file *s, int pin)
+{
+ const struct pinconf_ops *ops = pctldev->desc->confops;
+
+ /* no-op when not using generic pin config */
+ pinconf_generic_dump_pins(pctldev, s, NULL, pin);
+ if (ops && ops->pin_config_dbg_show)
+ ops->pin_config_dbg_show(pctldev, s, pin);
+}
+
+static int pinconf_pins_show(struct seq_file *s, void *what)
+{
+ struct pinctrl_dev *pctldev = s->private;
+ unsigned i, pin;
+
+ seq_puts(s, "Pin config settings per pin\n");
+ seq_puts(s, "Format: pin (name): configs\n");
+
+ mutex_lock(&pctldev->mutex);
+
+ /* The pin number can be retrived from the pin controller descriptor */
+ for (i = 0; i < pctldev->desc->npins; i++) {
+ struct pin_desc *desc;
+
+ pin = pctldev->desc->pins[i].number;
+ desc = pin_desc_get(pctldev, pin);
+ /* Skip if we cannot search the pin */
+ if (!desc)
+ continue;
+
+ seq_printf(s, "pin %d (%s): ", pin, desc->name);
+
+ pinconf_dump_pin(pctldev, s, pin);
+ seq_putc(s, '\n');
+ }
+
+ mutex_unlock(&pctldev->mutex);
+
+ return 0;
+}
+
+static void pinconf_dump_group(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned selector,
+ const char *gname)
+{
+ const struct pinconf_ops *ops = pctldev->desc->confops;
+
+ /* no-op when not using generic pin config */
+ pinconf_generic_dump_pins(pctldev, s, gname, 0);
+ if (ops && ops->pin_config_group_dbg_show)
+ ops->pin_config_group_dbg_show(pctldev, s, selector);
+}
+
+static int pinconf_groups_show(struct seq_file *s, void *what)
+{
+ struct pinctrl_dev *pctldev = s->private;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ unsigned ngroups = pctlops->get_groups_count(pctldev);
+ unsigned selector = 0;
+
+ seq_puts(s, "Pin config settings per pin group\n");
+ seq_puts(s, "Format: group (name): configs\n");
+
+ while (selector < ngroups) {
+ const char *gname = pctlops->get_group_name(pctldev, selector);
+
+ seq_printf(s, "%u (%s): ", selector, gname);
+ pinconf_dump_group(pctldev, s, selector, gname);
+ seq_putc(s, '\n');
+ selector++;
+ }
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
+DEFINE_SHOW_ATTRIBUTE(pinconf_groups);
+
+void pinconf_init_device_debugfs(struct dentry *devroot,
+ struct pinctrl_dev *pctldev)
+{
+ debugfs_create_file("pinconf-pins", 0444,
+ devroot, pctldev, &pinconf_pins_fops);
+ debugfs_create_file("pinconf-groups", 0444,
+ devroot, pctldev, &pinconf_groups_fops);
+}
+
+#endif