misc: issp: add sysfs node to control issp pins

issp_reset: toggle issp reset pin.
issp_usbreset: reload usb driver and toggle issp reset pin
issp_data: read and write the state of issp_data pin
issp_clk: read and write the state of issp_clk pin

Bug 1364476

Change-Id: I3b470f0745ed002b16bdc71f661e0d18629f796f
Signed-off-by: Jun Yan <juyan@nvidia.com>
Reviewed-on: http://git-master/r/259787
Reviewed-by: Anshul Jain (SW) <anshulj@nvidia.com>
Tested-by: Anshul Jain (SW) <anshulj@nvidia.com>
Reviewed-on: http://git-master/r/279099
Reviewed-by: Automatic_Commit_Validation_User

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/misc/issp/issp.c b/drivers/misc/issp/issp.c
index f77fca7a62cc..675f30b823d1 100644
--- a/drivers/misc/issp/issp.c
+++ b/drivers/misc/issp/issp.c
@@ -181,6 +181,77 @@ void issp_start_recovery_work(void)
 
 }
 
+static ssize_t issp_reset_set(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count) {
+	issp_uc_reset();
+	pr_err("issp: toggling reset pin on uC!");
+	return count;
+}
+
+static ssize_t issp_usbreset_set(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count) {
+	roth_usb_unload();
+	issp_uc_reset();
+	roth_usb_reload();
+	pr_err("issp: reset both usb and uC!");
+	return count;
+}
+
+static ssize_t issp_data_set(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count) {
+	int val;
+	struct issp_platform_data *pdata = dev->platform_data;
+
+	if (!kstrtoul(buf, 10, &val)) {
+		if (val == 1 || val == 0) {
+			gpio_set_value(pdata->data_gpio, val);
+			pr_err("issp: set data gpio to %d", val);
+		}
+	}
+	return count;
+}
+
+static ssize_t issp_data_show(struct device *dev, struct device_attribute *attr,
+		char *buf)  {
+	unsigned int val;
+	struct issp_platform_data *pdata = dev->platform_data;
+	val = gpio_get_value(pdata->data_gpio);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+
+static ssize_t issp_clk_set(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count) {
+	int val;
+	struct issp_platform_data *pdata = dev->platform_data;
+
+	if (!kstrtoul(buf, 10, &val)) {
+		if (val == 1 || val == 0) {
+			gpio_set_value(pdata->clk_gpio, val);
+			pr_err("issp: set clk gpio to %d", val);
+		}
+	}
+	return count;
+}
+
+static ssize_t issp_clk_show(struct device *dev, struct device_attribute *attr,
+		char *buf)  {
+	unsigned int val;
+	struct issp_platform_data *pdata = dev->platform_data;
+	val = gpio_get_value(pdata->clk_gpio);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static DEVICE_ATTR(issp_reset, S_IWGRP|S_IWUSR, NULL, issp_reset_set);
+static DEVICE_ATTR(issp_usbreset, S_IWGRP|S_IWUSR, NULL, issp_usbreset_set);
+static DEVICE_ATTR(issp_data, S_IWGRP|S_IWUSR|S_IRGRP|S_IRUSR,
+		issp_data_show, issp_data_set);
+static DEVICE_ATTR(issp_clk, S_IWGRP|S_IWUSR|S_IRGRP|S_IRUSR,
+		issp_clk_show, issp_clk_set);
+
 static int __init issp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -249,6 +320,22 @@ static int __init issp_probe(struct platform_device *pdev)
 			dev_err(dev, "Firmware update failed!\n");
 	}
 
+	ret = device_create_file(dev, &dev_attr_issp_reset);
+	if (ret)
+		dev_err(dev, "ISSP sysfs node create failed\n");
+
+	ret = device_create_file(dev, &dev_attr_issp_usbreset);
+	if (ret)
+		dev_err(dev, "ISSP sysfs node create failed\n");
+
+	ret = device_create_file(dev, &dev_attr_issp_data);
+	if (ret)
+		dev_err(dev, "ISSP sysfs node create failed\n");
+
+	ret = device_create_file(dev, &dev_attr_issp_clk);
+	if (ret)
+		dev_err(dev, "ISSP sysfs node create failed\n");
+
 	g_issp_wake_lock = devm_kzalloc(dev, sizeof(struct wake_lock),
 								GFP_KERNEL);
 	if (!g_issp_wake_lock)