linux-kernel - [PATCH 3/3] firmware: xilinx: Add sysfs support for feature config

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Message-ID: <20210817130553.20219-4-ronak.jain@xilinx.com>
Date:   Tue, 17 Aug 2021 06:05:53 -0700
From:   Ronak Jain <ronak.jain@...inx.com>
To:     <michal.simek@...inx.com>, <linux-kernel@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>, <rajan.vaja@...inx.com>,
        <corbet@....net>, <linux-arm-kernel@...ts.infradead.org>,
        <arnd@...db.de>, <lakshmi.sai.krishna.potthuri@...inx.com>,
        Ronak Jain <ronak.jain@...inx.com>
Subject: [PATCH 3/3] firmware: xilinx: Add sysfs support for feature config

This patch adds support for sysfs interface for runtime features
 configuration. The user can configure the features at runtime. First
 the user need to select the config id of the supported features and
 then the user can configure the parameters of the feature based on
 the config id. So far the support is added for the over temperature
 and external watchdog features.

Signed-off-by: Ronak Jain <ronak.jain@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c | 71 ++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index e2b0a8fb6f44..4c5010899837 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -1344,6 +1344,75 @@ static DEVICE_ATTR_RW(pggs1);
 static DEVICE_ATTR_RW(pggs2);
 static DEVICE_ATTR_RW(pggs3);

+static atomic_t feature_conf_id;
+
+static ssize_t feature_config_id_show(struct device *device,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+       return sysfs_emit(buf, "%d\n", atomic_read(&feature_conf_id));
+}
+
+static ssize_t feature_config_id_store(struct device *device,
+                                      struct device_attribute *attr,
+                                      const char *buf, size_t count)
+{
+       u32 config_id;
+       int ret;
+
+       if (!buf)
+               return -EINVAL;
+
+       ret = kstrtou32(buf, 10, &config_id);
+       if (ret)
+               return ret;
+
+       atomic_set(&feature_conf_id, config_id);
+
+       return count;
+}
+
+static DEVICE_ATTR_RW(feature_config_id);
+
+static ssize_t feature_config_value_show(struct device *device,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+       int ret;
+       u32 ret_payload[PAYLOAD_ARG_CNT];
+
+       ret = zynqmp_pm_get_feature_config(atomic_read(&feature_conf_id),
+                                          ret_payload);
+       if (ret)
+               return ret;
+
+       return sysfs_emit(buf, "%d\n", ret_payload[1]);
+}
+
+static ssize_t feature_config_value_store(struct device *device,
+                                         struct device_attribute *attr,
+                                         const char *buf, size_t count)
+{
+       u32 value;
+       int ret;
+
+       if (!buf)
+               return -EINVAL;
+
+       ret = kstrtou32(buf, 10, &value);
+       if (ret)
+               return ret;
+
+       ret = zynqmp_pm_set_feature_config(atomic_read(&feature_conf_id),
+                                          value);
+       if (ret)
+               return ret;
+
+       return count;
+}
+
+static DEVICE_ATTR_RW(feature_config_value);
+
 static struct attribute *zynqmp_firmware_attrs[] = {
        &dev_attr_ggs0.attr,
        &dev_attr_ggs1.attr,
@@ -1355,6 +1424,8 @@ static struct attribute *zynqmp_firmware_attrs[] = {
        &dev_attr_pggs3.attr,
        &dev_attr_shutdown_scope.attr,
        &dev_attr_health_status.attr,
+       &dev_attr_feature_config_id.attr,
+       &dev_attr_feature_config_value.attr,
        NULL,
 };

--
2.32.0.93.g670b81a

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