*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
* License terms: GNU General Public License (GPL) version 2
*/
#define pr_fmt(fmt) "pinmux core: " fmt
#include "core.h"
#include "pinmux.h"
-/**
- * struct pinmux_group - group list item for pinmux groups
- * @node: pinmux group list node
- * @func_selector: the function selector for the pinmux device handling
- * this pinmux
- * @group_selector: the group selector for this group
- */
-struct pinmux_group {
- struct list_head node;
- unsigned func_selector;
- unsigned group_selector;
-};
-
int pinmux_check_ops(struct pinctrl_dev *pctldev)
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
return 0;
}
+int pinmux_validate_map(struct pinctrl_map const *map, int i)
+{
+ if (!map->data.mux.function) {
+ pr_err("failed to register map %s (%d): no function given\n",
+ map->name, i);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
/**
* pin_request() - request a single pin to be muxed in, typically for GPIO
* @pin: the pin number in the global pin space
goto out;
}
- if (desc->owner && strcmp(desc->owner, owner)) {
+ if (desc->usecount && strcmp(desc->owner, owner)) {
dev_err(pctldev->dev,
"pin already requested\n");
goto out;
}
+
+ desc->usecount++;
+ if (desc->usecount > 1)
+ return 0;
+
desc->owner = owner;
/* Let each pin increase references to this module */
else
status = 0;
- if (status)
+ if (status) {
dev_err(pctldev->dev, "->request on device %s failed for pin %d\n",
pctldev->desc->name, pin);
+ module_put(pctldev->owner);
+ }
+
out_free_pin:
- if (status)
- desc->owner = NULL;
+ if (status) {
+ desc->usecount--;
+ if (!desc->usecount)
+ desc->owner = NULL;
+ }
out:
if (status)
dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
return NULL;
}
+ desc->usecount--;
+ if (desc->usecount)
+ return NULL;
+
/*
* If there is no kind of request function for the pin we just assume
* we got it by default and proceed.
return ret;
}
-/**
- * acquire_pins() - acquire all the pins for a certain function on a pinmux
- * @pctldev: the device to take the pins on
- * @owner: a representation of the owner of this pin; typically the device
- * name that controls its mux function
- * @group_selector: the group selector containing the pins to acquire
- */
-static int acquire_pins(struct pinctrl_dev *pctldev,
- const char *owner,
- unsigned group_selector)
-{
- const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- const unsigned *pins;
- unsigned num_pins;
- int ret;
- int i;
-
- ret = pctlops->get_group_pins(pctldev, group_selector,
- &pins, &num_pins);
- if (ret)
- return ret;
-
- dev_dbg(pctldev->dev, "requesting the %u pins from group %u\n",
- num_pins, group_selector);
-
- /* Try to allocate all pins in this group, one by one */
- for (i = 0; i < num_pins; i++) {
- ret = pin_request(pctldev, pins[i], owner, NULL);
- if (ret) {
- dev_err(pctldev->dev,
- "could not get request pin %d on device %s - conflicting mux mappings?\n",
- pins[i],
- pinctrl_dev_get_name(pctldev));
- /* On error release all taken pins */
- i--; /* this pin just failed */
- for (; i >= 0; i--)
- pin_free(pctldev, pins[i], NULL);
- return -ENODEV;
- }
- }
- return 0;
-}
-
-/**
- * release_pins() - release pins taken by earlier acquirement
- * @pctldev: the device to free the pins on
- * @group_selector: the group selector containing the pins to free
- */
-static void release_pins(struct pinctrl_dev *pctldev,
- unsigned group_selector)
-{
- const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- const unsigned *pins;
- unsigned num_pins;
- int ret;
- int i;
-
- ret = pctlops->get_group_pins(pctldev, group_selector,
- &pins, &num_pins);
- if (ret) {
- dev_err(pctldev->dev, "could not get pins to release for group selector %d\n",
- group_selector);
- return;
- }
- for (i = 0; i < num_pins; i++)
- pin_free(pctldev, pins[i], NULL);
-}
-
-/**
- * pinmux_check_pin_group() - check function and pin group combo
- * @pctldev: device to check the pin group vs function for
- * @func_selector: the function selector to check the pin group for, we have
- * already looked this up in the calling function
- * @pin_group: the pin group to match to the function
- *
- * This function will check that the pinmux driver can supply the
- * selected pin group for a certain function, returns the group selector if
- * the group and function selector will work fine together, else returns
- * negative
- */
-static int pinmux_check_pin_group(struct pinctrl_dev *pctldev,
- unsigned func_selector,
- const char *pin_group)
-{
- const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
- const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- int ret;
-
- /*
- * If the driver does not support different pin groups for the
- * functions, we only support group 0, and assume this exists.
- */
- if (!pctlops || !pctlops->list_groups)
- return 0;
-
- /*
- * Passing NULL (no specific group) will select the first and
- * hopefully only group of pins available for this function.
- */
- if (!pin_group) {
- char const * const *groups;
- unsigned num_groups;
-
- ret = pmxops->get_function_groups(pctldev, func_selector,
- &groups, &num_groups);
- if (ret)
- return ret;
- if (num_groups < 1)
- return -EINVAL;
- ret = pinctrl_get_group_selector(pctldev, groups[0]);
- if (ret < 0) {
- dev_err(pctldev->dev,
- "function %s wants group %s but the pin controller does not seem to have that group\n",
- pmxops->get_function_name(pctldev, func_selector),
- groups[0]);
- return ret;
- }
-
- if (num_groups > 1)
- dev_dbg(pctldev->dev,
- "function %s support more than one group, default-selecting first group %s (%d)\n",
- pmxops->get_function_name(pctldev, func_selector),
- groups[0],
- ret);
-
- return ret;
- }
-
- dev_dbg(pctldev->dev,
- "check if we have pin group %s on controller %s\n",
- pin_group, pinctrl_dev_get_name(pctldev));
-
- ret = pinctrl_get_group_selector(pctldev, pin_group);
- if (ret < 0) {
- dev_dbg(pctldev->dev,
- "%s does not support pin group %s with function %s\n",
- pinctrl_dev_get_name(pctldev),
- pin_group,
- pmxops->get_function_name(pctldev, func_selector));
- }
- return ret;
-}
-
-/**
- * pinmux_search_function() - check pin control driver for a certain function
- * @pctldev: device to check for function and position
- * @map: function map containing the function and position to look for
- * @func_selector: returns the applicable function selector if found
- * @group_selector: returns the applicable group selector if found
- *
- * This will search the pinmux driver for an applicable
- * function with a specific pin group, returns 0 if these can be mapped
- * negative otherwise
- */
-static int pinmux_search_function(struct pinctrl_dev *pctldev,
- struct pinctrl_map const *map,
- unsigned *func_selector,
- unsigned *group_selector)
+static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
+ const char *function)
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
unsigned selector = 0;
while (ops->list_functions(pctldev, selector) >= 0) {
const char *fname = ops->get_function_name(pctldev,
selector);
- int ret;
-
- if (!strcmp(map->function, fname)) {
- /* Found the function, check pin group */
- ret = pinmux_check_pin_group(pctldev, selector,
- map->group);
- if (ret < 0)
- return ret;
- /* This function and group selector can be used */
- *func_selector = selector;
- *group_selector = ret;
- return 0;
+ if (!strcmp(function, fname))
+ return selector;
- }
selector++;
}
pr_err("%s does not support function %s\n",
- pinctrl_dev_get_name(pctldev), map->function);
+ pinctrl_dev_get_name(pctldev), function);
return -EINVAL;
}
-/**
- * pinmux_enable_muxmap() - enable a map entry for a certain pinmux
- */
-static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev,
- struct pinctrl *p,
- struct device *dev,
- const char *devname,
- struct pinctrl_map const *map)
+int pinmux_map_to_setting(struct pinctrl_map const *map,
+ struct pinctrl_setting *setting)
{
- unsigned func_selector;
- unsigned group_selector;
- struct pinmux_group *grp;
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ char const * const *groups;
+ unsigned num_groups;
int ret;
+ const char *group;
+ int i;
+ const unsigned *pins;
+ unsigned num_pins;
- /*
- * Note that we're not locking the pinmux mutex here, because
- * this is only called at pinmux initialization time when it
- * has not been added to any list and thus is not reachable
- * by anyone else.
- */
+ setting->data.mux.func =
+ pinmux_func_name_to_selector(pctldev, map->data.mux.function);
+ if (setting->data.mux.func < 0)
+ return setting->data.mux.func;
- if (p->pctldev && p->pctldev != pctldev) {
- dev_err(pctldev->dev,
- "different pin control devices given for device %s, function %s\n",
- devname, map->function);
+ ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
+ &groups, &num_groups);
+ if (ret < 0)
+ return ret;
+ if (!num_groups)
return -EINVAL;
+
+ if (map->data.mux.group) {
+ bool found = false;
+ group = map->data.mux.group;
+ for (i = 0; i < num_groups; i++) {
+ if (!strcmp(group, groups[i])) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ return -EINVAL;
+ } else {
+ group = groups[0];
}
- p->dev = dev;
- p->pctldev = pctldev;
- /* Now go into the driver and try to match a function and group */
- ret = pinmux_search_function(pctldev, map, &func_selector,
- &group_selector);
- if (ret < 0)
- return ret;
+ setting->data.mux.group = pinctrl_get_group_selector(pctldev, group);
+ if (setting->data.mux.group < 0)
+ return setting->data.mux.group;
- /* Now add this group selector, we may have many of them */
- grp = kmalloc(sizeof(*grp), GFP_KERNEL);
- if (!grp)
- return -ENOMEM;
- grp->func_selector = func_selector;
- grp->group_selector = group_selector;
- ret = acquire_pins(pctldev, devname, group_selector);
+ ret = pctlops->get_group_pins(pctldev, setting->data.mux.group, &pins,
+ &num_pins);
if (ret) {
- kfree(grp);
- return ret;
+ dev_err(pctldev->dev,
+ "could not get pins for device %s group selector %d\n",
+ pinctrl_dev_get_name(pctldev), setting->data.mux.group);
+ return -ENODEV;
+ }
+
+ /* Try to allocate all pins in this group, one by one */
+ for (i = 0; i < num_pins; i++) {
+ ret = pin_request(pctldev, pins[i], map->dev_name, NULL);
+ if (ret) {
+ dev_err(pctldev->dev,
+ "could not get request pin %d on device %s\n",
+ pins[i], pinctrl_dev_get_name(pctldev));
+ /* On error release all taken pins */
+ i--; /* this pin just failed */
+ for (; i >= 0; i--)
+ pin_free(pctldev, pins[i], NULL);
+ return -ENODEV;
+ }
}
- list_add_tail(&grp->node, &p->groups);
return 0;
}
-/**
- * pinmux_apply_muxmap() - apply a certain mux mapping entry
- */
-int pinmux_apply_muxmap(struct pinctrl_dev *pctldev,
- struct pinctrl *p,
- struct device *dev,
- const char *devname,
- struct pinctrl_map const *map)
+void pinmux_free_setting(struct pinctrl_setting const *setting)
{
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ const unsigned *pins;
+ unsigned num_pins;
int ret;
+ int i;
- ret = pinmux_enable_muxmap(pctldev, p, dev,
- devname, map);
+ ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
+ &pins, &num_pins);
if (ret) {
- pinmux_put(p);
- return ret;
+ dev_err(pctldev->dev,
+ "could not get pins for device %s group selector %d\n",
+ pinctrl_dev_get_name(pctldev), setting->data.mux.group);
+ return;
}
- return 0;
-}
-
-/**
- * pinmux_put() - free up the pinmux portions of a pin controller handle
- */
-void pinmux_put(struct pinctrl *p)
-{
- struct list_head *node, *tmp;
-
- list_for_each_safe(node, tmp, &p->groups) {
- struct pinmux_group *grp =
- list_entry(node, struct pinmux_group, node);
- /* Release all pins taken by this group */
- release_pins(p->pctldev, grp->group_selector);
- list_del(node);
- kfree(grp);
- }
+ for (i = 0; i < num_pins; i++)
+ pin_free(pctldev, pins[i], NULL);
}
-/**
- * pinmux_enable() - enable the pinmux portion of a pin control handle
- */
-int pinmux_enable(struct pinctrl *p)
+int pinmux_enable_setting(struct pinctrl_setting const *setting)
{
- struct pinctrl_dev *pctldev = p->pctldev;
+ struct pinctrl_dev *pctldev = setting->pctldev;
const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
- int ret;
- list_for_each_entry(grp, &p->groups, node) {
- ret = ops->enable(pctldev, grp->func_selector,
- grp->group_selector);
- if (ret)
- /*
- * TODO: call disable() on all groups we called
- * enable() on to this point?
- */
- return ret;
- }
- return 0;
+ return ops->enable(pctldev, setting->data.mux.func,
+ setting->data.mux.group);
}
-/**
- * pinmux_disable() - disable the pinmux portions of a pin control handle
- */
-void pinmux_disable(struct pinctrl *p)
+void pinmux_disable_setting(struct pinctrl_setting const *setting)
{
- struct pinctrl_dev *pctldev = p->pctldev;
+ struct pinctrl_dev *pctldev = setting->pctldev;
const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
- list_for_each_entry(grp, &p->groups, node) {
- ops->disable(pctldev, grp->func_selector,
- grp->group_selector);
- }
+ ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
}
#ifdef CONFIG_DEBUG_FS
return 0;
}
-void pinmux_dbg_show(struct seq_file *s, struct pinctrl *p)
+void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
{
- struct pinctrl_dev *pctldev = p->pctldev;
- const struct pinmux_ops *pmxops;
- const struct pinctrl_ops *pctlops;
- struct pinmux_group *grp;
- const char *sep = "";
-
- pmxops = pctldev->desc->pmxops;
- pctlops = pctldev->desc->pctlops;
-
- seq_printf(s, " groups: [");
- list_for_each_entry(grp, &p->groups, node) {
- seq_printf(s, "%s%s (%u)=%s (%u)",
- sep,
- pctlops->get_group_name(pctldev,
- grp->group_selector),
- grp->group_selector,
- pmxops->get_function_name(pctldev,
- grp->func_selector),
- grp->func_selector);
- sep = ", ";
- }
- seq_printf(s, " ]");
+ seq_printf(s, "group %s\nfunction %s\n",
+ map->data.mux.group ? map->data.mux.group : "(default)",
+ map->data.mux.function);
+}
+
+void pinmux_show_setting(struct seq_file *s,
+ struct pinctrl_setting const *setting)
+{
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+
+ seq_printf(s, "group: %s (%u) function: %s (%u)\n",
+ pctlops->get_group_name(pctldev, setting->data.mux.group),
+ setting->data.mux.group,
+ pmxops->get_function_name(pctldev, setting->data.mux.func),
+ setting->data.mux.func);
}
static int pinmux_functions_open(struct inode *inode, struct file *file)
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff