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Commit 97ef9ec0 authored by Satya Durga Srinivasu Prabhala's avatar Satya Durga Srinivasu Prabhala
Browse files

sensors: add support to load SLPI images in SSC driver 



This commit adds support for loading SLPI images.

Change-Id: I27f00927ebcb9c79b21207a2d5d622750200b162
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent da9777c8

drivers/sensors/sensors_ssc.c

+190 −2
Original line number Diff line number Diff line 
/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2015, 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
@@ -22,6 +22,14 @@ 
#include <asm/arch_timer.h>

#include <linux/uaccess.h>



#include <linux/kernel.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/sysfs.h>

#include <soc/qcom/subsystem_restart.h>



#define IMAGE_LOAD_CMD 1

#define IMAGE_UNLOAD_CMD 0

#define CLASS_NAME	"ssc"

#define DRV_NAME	"sensors"

#define DRV_VERSION	"2.00"
@@ -37,6 +45,180 @@ struct sns_ssc_control_s { 
};

static struct sns_ssc_control_s sns_ctl;



static ssize_t slpi_boot_store(struct kobject *kobj,

	struct kobj_attribute *attr,

	const char *buf, size_t count);



struct slpi_loader_private {

	void *pil_h;

	struct kobject *boot_slpi_obj;

	struct attribute_group *attr_group;

};



static struct kobj_attribute slpi_boot_attribute =

	__ATTR(boot, 0220, NULL, slpi_boot_store);



static struct attribute *attrs[] = {

	&slpi_boot_attribute.attr,

	NULL,

};



static struct platform_device *slpi_private;



static void slpi_loader_do(struct platform_device *pdev)

{



	struct slpi_loader_private *priv = NULL;



	if (!pdev) {

		dev_err(&pdev->dev, "%s: Platform device null\n", __func__);

		goto fail;

	}



	if (!pdev->dev.of_node) {

		dev_err(&pdev->dev,

			"%s: Device tree information missing\n", __func__);

		goto fail;

	}



	priv = platform_get_drvdata(pdev);

	if (!priv) {

		dev_err(&pdev->dev,

		" %s: Private data get failed\n", __func__);

		goto fail;

	}



	priv->pil_h = subsystem_get("slpi");

	if (IS_ERR(priv->pil_h)) {

		dev_err(&pdev->dev, "%s: pil get failed,\n",

			__func__);

		goto fail;

	}



	dev_err(&pdev->dev, "%s: SLPI image is loaded\n", __func__);

	return;



fail:

	dev_err(&pdev->dev, "%s: SLPI image loading failed\n", __func__);

}



static void slpi_loader_unload(struct platform_device *pdev)

{

	struct slpi_loader_private *priv = NULL;



	priv = platform_get_drvdata(pdev);



	if (!priv)

		return;



	if (priv->pil_h) {

		dev_dbg(&pdev->dev, "%s: calling subsystem put\n", __func__);

		subsystem_put(priv->pil_h);

		priv->pil_h = NULL;

	}

}



static ssize_t slpi_boot_store(struct kobject *kobj,

	struct kobj_attribute *attr,

	const char *buf,

	size_t count)

{

	int boot = 0;



	if (sscanf(buf, "%du", &boot) != 1)

		return -EINVAL;



	if (boot == IMAGE_LOAD_CMD) {

		pr_debug("%s: going to call slpi_loader_do\n", __func__);

		slpi_loader_do(slpi_private);

	} else if (boot == IMAGE_UNLOAD_CMD) {

		pr_debug("%s: going to call slpi_unloader\n", __func__);

		slpi_loader_unload(slpi_private);

	}

	return count;

}



static int slpi_loader_init_sysfs(struct platform_device *pdev)

{

	int ret = -EINVAL;

	struct slpi_loader_private *priv = NULL;



	slpi_private = NULL;



	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);

	if (!priv) {

		ret = -ENOMEM;

		return ret;

	}



	platform_set_drvdata(pdev, priv);



	priv->pil_h = NULL;

	priv->boot_slpi_obj = NULL;

	priv->attr_group = devm_kzalloc(&pdev->dev,

				sizeof(*(priv->attr_group)),

				GFP_KERNEL);

	if (!priv->attr_group) {

		dev_err(&pdev->dev, "%s: malloc attr_group failed\n",

						__func__);

		ret = -ENOMEM;

		goto error_return;

	}



	priv->attr_group->attrs = attrs;



	priv->boot_slpi_obj = kobject_create_and_add("boot_slpi", kernel_kobj);

	if (!priv->boot_slpi_obj) {

		dev_err(&pdev->dev, "%s: sysfs create and add failed\n",

						__func__);

		ret = -ENOMEM;

		goto error_return;

	}



	ret = sysfs_create_group(priv->boot_slpi_obj, priv->attr_group);

	if (ret) {

		dev_err(&pdev->dev, "%s: sysfs create group failed %d\n",

							__func__, ret);

		goto error_return;

	}



	slpi_private = pdev;



	return 0;



error_return:



	if (priv->boot_slpi_obj) {

		kobject_del(priv->boot_slpi_obj);

		priv->boot_slpi_obj = NULL;

	}



	return ret;

}



static int slpi_loader_remove(struct platform_device *pdev)

{

	struct slpi_loader_private *priv = NULL;



	priv = platform_get_drvdata(pdev);



	if (!priv)

		return 0;



	if (priv->pil_h) {

		subsystem_put(priv->pil_h);

		priv->pil_h = NULL;

	}



	if (priv->boot_slpi_obj) {

		sysfs_remove_group(priv->boot_slpi_obj, priv->attr_group);

		kobject_del(priv->boot_slpi_obj);

		priv->boot_slpi_obj = NULL;

	}



	return 0;

}



/*

 * Read QTimer clock ticks and scale down to 32KHz clock as used

 * in DSPS
@@ -104,7 +286,12 @@ const struct file_operations sensors_ssc_fops = { 


static int sensors_ssc_probe(struct platform_device *pdev)

{

	int ret = 0;

	int ret = slpi_loader_init_sysfs(pdev);



	if (ret != 0) {

		dev_err(&pdev->dev, "%s: Error in initing sysfs\n", __func__);

		return ret;

	}



	sns_ctl.dev_class = class_create(THIS_MODULE, CLASS_NAME);

	if (sns_ctl.dev_class == NULL) {
@@ -156,6 +343,7 @@ res_err: 


static int sensors_ssc_remove(struct platform_device *pdev)

{

	slpi_loader_remove(pdev);

	cdev_del(sns_ctl.cdev);

	kfree(sns_ctl.cdev);

	sns_ctl.cdev = NULL;