1 files changed, 110 insertions, 193 deletions

diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c
index a43c0ce5e3d8..fc686a350ae8 100644
--- a/drivers/i2c/muxes/i2c-mux-pinctrl.c
+++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c
@@ -1,275 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * I2C multiplexer using pinctrl API
  *
  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
-#include <linux/init.h>
 #include <linux/module.h>
-#include <linux/of_i2c.h>
 #include <linux/pinctrl/consumer.h>
-#include <linux/i2c-mux-pinctrl.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include "../../pinctrl/core.h"
 
 struct i2c_mux_pinctrl {
-	struct device *dev;
-	struct i2c_mux_pinctrl_platform_data *pdata;
 	struct pinctrl *pinctrl;
-	struct pinctrl_state **states;
-	struct pinctrl_state *state_idle;
-	struct i2c_adapter *parent;
-	struct i2c_adapter **busses;
+	struct pinctrl_state *states[];
 };
 
-static int i2c_mux_pinctrl_select(struct i2c_adapter *adap, void *data,
-				  u32 chan)
+static int i2c_mux_pinctrl_select(struct i2c_mux_core *muxc, u32 chan)
 {
-	struct i2c_mux_pinctrl *mux = data;
+	struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc);
 
 	return pinctrl_select_state(mux->pinctrl, mux->states[chan]);
 }
 
-static int i2c_mux_pinctrl_deselect(struct i2c_adapter *adap, void *data,
-				    u32 chan)
+static int i2c_mux_pinctrl_deselect(struct i2c_mux_core *muxc, u32 chan)
 {
-	struct i2c_mux_pinctrl *mux = data;
-
-	return pinctrl_select_state(mux->pinctrl, mux->state_idle);
+	return i2c_mux_pinctrl_select(muxc, muxc->num_adapters);
 }
 
-#ifdef CONFIG_OF
-static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
-				struct platform_device *pdev)
+static struct i2c_adapter *i2c_mux_pinctrl_root_adapter(
+	struct pinctrl_state *state)
 {
-	struct device_node *np = pdev->dev.of_node;
-	int num_names, i, ret;
-	struct device_node *adapter_np;
-	struct i2c_adapter *adapter;
+	struct i2c_adapter *root = NULL;
+	struct pinctrl_setting *setting;
+	struct i2c_adapter *pin_root;
 
-	if (!np)
-		return 0;
-
-	mux->pdata = devm_kzalloc(&pdev->dev, sizeof(*mux->pdata), GFP_KERNEL);
-	if (!mux->pdata) {
-		dev_err(mux->dev,
-			"Cannot allocate i2c_mux_pinctrl_platform_data\n");
-		return -ENOMEM;
+	list_for_each_entry(setting, &state->settings, node) {
+		pin_root = i2c_root_adapter(setting->pctldev->dev);
+		if (!pin_root)
+			return NULL;
+		if (!root)
+			root = pin_root;
+		else if (root != pin_root)
+			return NULL;
 	}
 
-	num_names = of_property_count_strings(np, "pinctrl-names");
-	if (num_names < 0) {
-		dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n",
-			num_names);
-		return num_names;
-	}
-
-	mux->pdata->pinctrl_states = devm_kzalloc(&pdev->dev,
-		sizeof(*mux->pdata->pinctrl_states) * num_names,
-		GFP_KERNEL);
-	if (!mux->pdata->pinctrl_states) {
-		dev_err(mux->dev, "Cannot allocate pinctrl_states\n");
-		return -ENOMEM;
-	}
+	return root;
+}
 
-	for (i = 0; i < num_names; i++) {
-		ret = of_property_read_string_index(np, "pinctrl-names", i,
-			&mux->pdata->pinctrl_states[mux->pdata->bus_count]);
-		if (ret < 0) {
-			dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n",
-				ret);
-			return ret;
-		}
-		if (!strcmp(mux->pdata->pinctrl_states[mux->pdata->bus_count],
-			    "idle")) {
-			if (i != num_names - 1) {
-				dev_err(mux->dev, "idle state must be last\n");
-				return -EINVAL;
-			}
-			mux->pdata->pinctrl_state_idle = "idle";
-		} else {
-			mux->pdata->bus_count++;
-		}
-	}
+static struct i2c_adapter *i2c_mux_pinctrl_parent_adapter(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *parent_np;
+	struct i2c_adapter *parent;
 
-	adapter_np = of_parse_phandle(np, "i2c-parent", 0);
-	if (!adapter_np) {
-		dev_err(mux->dev, "Cannot parse i2c-parent\n");
-		return -ENODEV;
-	}
-	adapter = of_find_i2c_adapter_by_node(adapter_np);
-	if (!adapter) {
-		dev_err(mux->dev, "Cannot find parent bus\n");
-		return -ENODEV;
+	parent_np = of_parse_phandle(np, "i2c-parent", 0);
+	if (!parent_np) {
+		dev_err(dev, "Cannot parse i2c-parent\n");
+		return ERR_PTR(-ENODEV);
 	}
-	mux->pdata->parent_bus_num = i2c_adapter_id(adapter);
-	put_device(&adapter->dev);
+	parent = of_get_i2c_adapter_by_node(parent_np);
+	of_node_put(parent_np);
+	if (!parent)
+		return ERR_PTR(-EPROBE_DEFER);
 
-	return 0;
+	return parent;
 }
-#else
-static inline int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
-					   struct platform_device *pdev)
-{
-	return 0;
-}
-#endif
 
 static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct i2c_mux_core *muxc;
 	struct i2c_mux_pinctrl *mux;
-	int (*deselect)(struct i2c_adapter *, void *, u32);
-	int i, ret;
+	struct i2c_adapter *parent;
+	struct i2c_adapter *root;
+	int num_names, i, ret;
+	const char *name;
 
-	mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
-	if (!mux) {
-		dev_err(&pdev->dev, "Cannot allocate i2c_mux_pinctrl\n");
-		ret = -ENOMEM;
-		goto err;
+	num_names = of_property_count_strings(np, "pinctrl-names");
+	if (num_names < 0) {
+		dev_err(dev, "Cannot parse pinctrl-names: %d\n",
+			num_names);
+		return num_names;
 	}
-	platform_set_drvdata(pdev, mux);
-
-	mux->dev = &pdev->dev;
 
-	mux->pdata = pdev->dev.platform_data;
-	if (!mux->pdata) {
-		ret = i2c_mux_pinctrl_parse_dt(mux, pdev);
-		if (ret < 0)
-			goto err;
-	}
-	if (!mux->pdata) {
-		dev_err(&pdev->dev, "Missing platform data\n");
-		ret = -ENODEV;
-		goto err;
-	}
+	parent = i2c_mux_pinctrl_parent_adapter(dev);
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
 
-	mux->states = devm_kzalloc(&pdev->dev,
-				   sizeof(*mux->states) * mux->pdata->bus_count,
-				   GFP_KERNEL);
-	if (!mux->states) {
-		dev_err(&pdev->dev, "Cannot allocate states\n");
+	muxc = i2c_mux_alloc(parent, dev, num_names,
+			     struct_size(mux, states, num_names),
+			     0, i2c_mux_pinctrl_select, NULL);
+	if (!muxc) {
 		ret = -ENOMEM;
-		goto err;
+		goto err_put_parent;
 	}
+	mux = i2c_mux_priv(muxc);
 
-	mux->busses = devm_kzalloc(&pdev->dev,
-				   sizeof(*mux->busses) * mux->pdata->bus_count,
-				   GFP_KERNEL);
-	if (!mux->busses) {
-		dev_err(&pdev->dev, "Cannot allocate busses\n");
-		ret = -ENOMEM;
-		goto err;
-	}
+	platform_set_drvdata(pdev, muxc);
 
-	mux->pinctrl = devm_pinctrl_get(&pdev->dev);
+	mux->pinctrl = devm_pinctrl_get(dev);
 	if (IS_ERR(mux->pinctrl)) {
 		ret = PTR_ERR(mux->pinctrl);
-		dev_err(&pdev->dev, "Cannot get pinctrl: %d\n", ret);
-		goto err;
+		dev_err(dev, "Cannot get pinctrl: %d\n", ret);
+		goto err_put_parent;
 	}
-	for (i = 0; i < mux->pdata->bus_count; i++) {
-		mux->states[i] = pinctrl_lookup_state(mux->pinctrl,
-						mux->pdata->pinctrl_states[i]);
-			if (IS_ERR(mux->states[i])) {
-				ret = PTR_ERR(mux->states[i]);
-				dev_err(&pdev->dev,
-					"Cannot look up pinctrl state %s: %d\n",
-					mux->pdata->pinctrl_states[i], ret);
-				goto err;
-			}
-	}
-	if (mux->pdata->pinctrl_state_idle) {
-		mux->state_idle = pinctrl_lookup_state(mux->pinctrl,
-						mux->pdata->pinctrl_state_idle);
-		if (IS_ERR(mux->state_idle)) {
-			ret = PTR_ERR(mux->state_idle);
-			dev_err(&pdev->dev,
-				"Cannot look up pinctrl state %s: %d\n",
-				mux->pdata->pinctrl_state_idle, ret);
-			goto err;
+
+	for (i = 0; i < num_names; i++) {
+		ret = of_property_read_string_index(np, "pinctrl-names", i,
+						    &name);
+		if (ret < 0) {
+			dev_err(dev, "Cannot parse pinctrl-names: %d\n", ret);
+			goto err_put_parent;
+		}
+
+		mux->states[i] = pinctrl_lookup_state(mux->pinctrl, name);
+		if (IS_ERR(mux->states[i])) {
+			ret = PTR_ERR(mux->states[i]);
+			dev_err(dev, "Cannot look up pinctrl state %s: %d\n",
+				name, ret);
+			goto err_put_parent;
 		}
 
-		deselect = i2c_mux_pinctrl_deselect;
-	} else {
-		deselect = NULL;
+		if (strcmp(name, "idle"))
+			continue;
+
+		if (i != num_names - 1) {
+			dev_err(dev, "idle state must be last\n");
+			ret = -EINVAL;
+			goto err_put_parent;
+		}
+		muxc->deselect = i2c_mux_pinctrl_deselect;
 	}
 
-	mux->parent = i2c_get_adapter(mux->pdata->parent_bus_num);
-	if (!mux->parent) {
-		dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
-			mux->pdata->parent_bus_num);
-		ret = -ENODEV;
-		goto err;
+	root = i2c_root_adapter(&muxc->parent->dev);
+
+	muxc->mux_locked = true;
+	for (i = 0; i < num_names; i++) {
+		if (root != i2c_mux_pinctrl_root_adapter(mux->states[i])) {
+			muxc->mux_locked = false;
+			break;
+		}
 	}
+	if (muxc->mux_locked)
+		dev_info(dev, "mux-locked i2c mux\n");
 
-	for (i = 0; i < mux->pdata->bus_count; i++) {
-		u32 bus = mux->pdata->base_bus_num ?
-				(mux->pdata->base_bus_num + i) : 0;
-
-		mux->busses[i] = i2c_add_mux_adapter(mux->parent, &pdev->dev,
-						     mux, bus, i, 0,
-						     i2c_mux_pinctrl_select,
-						     deselect);
-		if (!mux->busses[i]) {
-			ret = -ENODEV;
-			dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
+	/* Do not add any adapter for the idle state (if it's there at all). */
+	for (i = 0; i < num_names - !!muxc->deselect; i++) {
+		ret = i2c_mux_add_adapter(muxc, 0, i);
+		if (ret)
 			goto err_del_adapter;
-		}
 	}
 
 	return 0;
 
 err_del_adapter:
-	for (; i > 0; i--)
-		i2c_del_mux_adapter(mux->busses[i - 1]);
-	i2c_put_adapter(mux->parent);
-err:
+	i2c_mux_del_adapters(muxc);
+err_put_parent:
+	i2c_put_adapter(parent);
+
 	return ret;
 }
 
-static int i2c_mux_pinctrl_remove(struct platform_device *pdev)
+static void i2c_mux_pinctrl_remove(struct platform_device *pdev)
 {
-	struct i2c_mux_pinctrl *mux = platform_get_drvdata(pdev);
-	int i;
+	struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
 
-	for (i = 0; i < mux->pdata->bus_count; i++)
-		i2c_del_mux_adapter(mux->busses[i]);
-
-	i2c_put_adapter(mux->parent);
-
-	return 0;
+	i2c_mux_del_adapters(muxc);
+	i2c_put_adapter(muxc->parent);
 }
 
-#ifdef CONFIG_OF
 static const struct of_device_id i2c_mux_pinctrl_of_match[] = {
 	{ .compatible = "i2c-mux-pinctrl", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, i2c_mux_pinctrl_of_match);
-#endif
 
 static struct platform_driver i2c_mux_pinctrl_driver = {
 	.driver	= {
 		.name	= "i2c-mux-pinctrl",
-		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(i2c_mux_pinctrl_of_match),
+		.of_match_table = i2c_mux_pinctrl_of_match,
 	},
 	.probe	= i2c_mux_pinctrl_probe,
-	.remove	= i2c_mux_pinctrl_remove,
+	.remove = i2c_mux_pinctrl_remove,
 };
 module_platform_driver(i2c_mux_pinctrl_driver);