394349f778
This is a split-off from the earlier patch set which adds generic pin configuration for the pin controllers that want it. Since we may have a system with mixed generic and custom pin controllers, we pass a boolean in the pin controller ops vtable to indicate if it is generic. ChangeLog v1->v5: - Follow parent patch versioning number system. - Document the semantic meaning of return values from pin config get functions, so we can iterate over pins and check their properties from debugfs as part of the generic config code. - Use proper cast functions in the generic debugfs pin config file. - Expand generic config to optionally cover groups too. ChangeLog v5->v6: - Update to match underlying changes. ChangeLog v6->v7: - Drop DRIVE_OFF parameter, use bias high impedance for this - Delete argument for drive modes push-pull, od and os. These are now just state transitions. - Delete slew rate rising/falling due to discussions on on proper semantics - Drop config wakeup, struct irq_chip does this for now, add back if need be. - Set PIN_CONFIG_END to 0x7fff making room for custom config parameters from 0x8000 and up. - Prefix accessor functions with pinconf_
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* Core driver for the generic 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) "generic pinconfig core: " fmt
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#include <linux/kernel.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/pinctrl.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include "core.h"
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#include "pinconf.h"
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#ifdef CONFIG_DEBUG_FS
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struct pin_config_item {
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const enum pin_config_param param;
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const char * const display;
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const char * const format;
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};
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#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
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struct pin_config_item conf_items[] = {
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PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
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PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
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PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
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PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
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};
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void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned pin)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
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unsigned long config;
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int ret;
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/* We want to check out this parameter */
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config = pinconf_to_config_packed(conf_items[i].param, 0);
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ret = pin_config_get_for_pin(pctldev, pin, &config);
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/* These are legal errors */
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if (ret == -EINVAL || ret == -ENOTSUPP)
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continue;
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if (ret) {
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
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continue;
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}
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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].format &&
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pinconf_to_config_argument(config) != 0)
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seq_printf(s, " (%u %s)",
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pinconf_to_config_argument(config),
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conf_items[i].format);
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}
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}
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void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
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struct seq_file *s, const char *gname)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
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unsigned long config;
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int ret;
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/* We want to check out this parameter */
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config = pinconf_to_config_packed(conf_items[i].param, 0);
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ret = pin_config_group_get(dev_name(pctldev->dev), gname,
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&config);
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/* These are legal errors */
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if (ret == -EINVAL || ret == -ENOTSUPP)
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continue;
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if (ret) {
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
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continue;
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}
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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].format && config != 0)
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seq_printf(s, " (%u %s)",
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pinconf_to_config_argument(config),
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conf_items[i].format);
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}
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}
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#endif
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