drivers: mfd: Move codec reset gpio config to early boot

WCD and WSA codecs uses MSM gpios that are accessed through pinctrl
mechanism. Codec reset gpios need to be configured before master
controller is initialized otherwise codec cannot be enumerated
on the bus. Add a new platform device driver to update reset gpio
configuration to valid state before bus initialization.

Change-Id: I1e36f4a85334704652c6b50950f50b90224a472e
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>

3 files changed, 199 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 5a846d32af00..8e7812a89e67 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1492,6 +1492,16 @@ config MFD_STW481X
 	  in various ST Microelectronics and ST-Ericsson embedded
 	  Nomadik series.
 
+config MSM_CDC_PINCTRL
+	tristate "MSM Codec Pinctrl"
+	select MFD_CORE
+	help
+	  Enables msm codec pinctrl driver. The pinctrl driver
+	  provides support for handling WCD and WSA MSM gpios. This
+	  pinctrl driver will handle WCD and WSA gpios pinctrl states.
+	  This driver acts as interface between codec and pinctrl
+	  framework.
+
 config WCD9330_CODEC
 	tristate "WCD9330 Codec"
 	select SLIMBUS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f5f7b51ea2a8..5bd54625c3e4 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -189,6 +189,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
 obj-$(CONFIG_MFD_SKY81452)	+= sky81452.o
+obj-$(CONFIG_MSM_CDC_PINCTRL)	+= msm-cdc-pinctrl.o
 obj-$(CONFIG_WCD9330_CODEC)	+= wcd9xxx-core.o wcd9xxx-irq.o wcd9xxx-slimslave.o\
 						wcd9xxx-core-resource.o wcd9330-regmap.o
 obj-$(CONFIG_WCD9335_CODEC)	+= wcd9xxx-core.o wcd9xxx-irq.o wcd9xxx-slimslave.o\
diff --git a/drivers/mfd/msm-cdc-pinctrl.c b/drivers/mfd/msm-cdc-pinctrl.c
new file mode 100644
index 000000000000..5f5c3692e9c4
--- /dev/null
+++ b/drivers/mfd/msm-cdc-pinctrl.c
@@ -0,0 +1,188 @@
+/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/mfd/msm-cdc-pinctrl.h>
+
+struct msm_cdc_pinctrl_info {
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pinctrl_active;
+	struct pinctrl_state *pinctrl_sleep;
+};
+
+static struct msm_cdc_pinctrl_info *msm_cdc_pinctrl_get_gpiodata(
+						struct device_node *np)
+{
+	struct platform_device *pdev;
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	if (!np) {
+		pr_err("%s: device node is null\n", __func__);
+		return NULL;
+	}
+
+	pdev = of_find_device_by_node(np);
+	if (!pdev) {
+		pr_err("%s: platform device not found!\n", __func__);
+		return NULL;
+	}
+
+	gpio_data = dev_get_drvdata(&pdev->dev);
+	if (!gpio_data)
+		dev_err(&pdev->dev, "%s: cannot find cdc gpio info\n",
+			__func__);
+
+	return gpio_data;
+}
+
+/*
+ * msm_cdc_pinctrl_select_sleep_state: select pinctrl sleep state
+ * @np: pointer to struct device_node
+ *
+ * Returns error code for failure
+ */
+int msm_cdc_pinctrl_select_sleep_state(struct device_node *np)
+{
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
+	if (!gpio_data)
+		return -EINVAL;
+
+	if (!gpio_data->pinctrl_sleep) {
+		pr_err("%s: pinctrl sleep state is null\n", __func__);
+		return -EINVAL;
+	}
+
+	return pinctrl_select_state(gpio_data->pinctrl,
+				    gpio_data->pinctrl_sleep);
+}
+EXPORT_SYMBOL(msm_cdc_pinctrl_select_sleep_state);
+
+/*
+ * msm_cdc_pinctrl_select_active_state: select pinctrl active state
+ * @np: pointer to struct device_node
+ *
+ * Returns error code for failure
+ */
+int msm_cdc_pinctrl_select_active_state(struct device_node *np)
+{
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
+	if (!gpio_data)
+		return -EINVAL;
+
+	if (!gpio_data->pinctrl_active) {
+		pr_err("%s: pinctrl active state is null\n", __func__);
+		return -EINVAL;
+	}
+
+	return pinctrl_select_state(gpio_data->pinctrl,
+				    gpio_data->pinctrl_active);
+}
+EXPORT_SYMBOL(msm_cdc_pinctrl_select_active_state);
+
+static int msm_cdc_pinctrl_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	gpio_data = devm_kzalloc(&pdev->dev,
+				 sizeof(struct msm_cdc_pinctrl_info),
+				 GFP_KERNEL);
+	if (!gpio_data)
+		return -ENOMEM;
+
+	gpio_data->pinctrl = devm_pinctrl_get(&pdev->dev);
+	if (IS_ERR_OR_NULL(gpio_data->pinctrl)) {
+		dev_err(&pdev->dev, "%s: Cannot get cdc gpio pinctrl:%ld\n",
+			__func__, PTR_ERR(gpio_data->pinctrl));
+		ret = PTR_ERR(gpio_data->pinctrl);
+		goto err_pctrl_get;
+	}
+
+	gpio_data->pinctrl_active = pinctrl_lookup_state(
+					gpio_data->pinctrl, "aud_active");
+	if (IS_ERR_OR_NULL(gpio_data->pinctrl_active)) {
+		dev_err(&pdev->dev, "%s: Cannot get aud_active pinctrl state:%ld\n",
+			__func__, PTR_ERR(gpio_data->pinctrl_active));
+		ret = PTR_ERR(gpio_data->pinctrl_active);
+		goto err_lookup_state;
+	}
+
+	gpio_data->pinctrl_sleep = pinctrl_lookup_state(
+					gpio_data->pinctrl, "aud_sleep");
+	if (IS_ERR_OR_NULL(gpio_data->pinctrl_sleep)) {
+		dev_err(&pdev->dev, "%s: Cannot get aud_sleep pinctrl state:%ld\n",
+			__func__, PTR_ERR(gpio_data->pinctrl_sleep));
+		ret = PTR_ERR(gpio_data->pinctrl_sleep);
+		goto err_lookup_state;
+	}
+
+	/* Set pinctrl state to aud_sleep by default */
+	ret = pinctrl_select_state(gpio_data->pinctrl,
+				   gpio_data->pinctrl_sleep);
+	if (ret)
+		dev_err(&pdev->dev, "%s: set cdc gpio sleep state fail: %d\n",
+			__func__, ret);
+
+	dev_set_drvdata(&pdev->dev, gpio_data);
+	return 0;
+
+err_lookup_state:
+	devm_pinctrl_put(gpio_data->pinctrl);
+err_pctrl_get:
+	devm_kfree(&pdev->dev, gpio_data);
+	return ret;
+}
+
+static int msm_cdc_pinctrl_remove(struct platform_device *pdev)
+{
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	gpio_data = dev_get_drvdata(&pdev->dev);
+
+	if (gpio_data && gpio_data->pinctrl)
+		devm_pinctrl_put(gpio_data->pinctrl);
+
+	devm_kfree(&pdev->dev, gpio_data);
+
+	return 0;
+}
+
+static const struct of_device_id msm_cdc_pinctrl_match[] = {
+	{.compatible = "qcom,msm-cdc-pinctrl"},
+	{}
+};
+
+static struct platform_driver msm_cdc_pinctrl_driver = {
+	.driver = {
+		.name = "msm-cdc-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = msm_cdc_pinctrl_match,
+	},
+	.probe = msm_cdc_pinctrl_probe,
+	.remove = msm_cdc_pinctrl_remove,
+};
+module_platform_driver(msm_cdc_pinctrl_driver);
+
+MODULE_DESCRIPTION("MSM CODEC pin control platform driver");
+MODULE_LICENSE("GPL v2");