linux-kernel - [PATCH 2/2] thermal: int340x: processor_thermal: Export additional attributes

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Date:   Sun, 16 May 2021 23:14:41 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     daniel.lezcano@...aro.org, rui.zhang@...el.com, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 2/2] thermal: int340x: processor_thermal: Export additional attributes

Export additional attributes:

ddr_data_rate (RO) : Show current DDR (Double Data Rate) data rate.
rfi_restriction (RW) : Show or set current state for RFI (Radio
			Frequency Interference) protection.

These attributes use mailbox commands to get/set information. Here
command codes are:
0x0007: Read RFI restriction
0x0107: Read DDR data rate
0x0008: Write RFI restriction

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../int340x_thermal/processor_thermal_rfim.c  | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
index aef993a813e2..2b8a3235d518 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
@@ -190,6 +190,59 @@ static DEVICE_ATTR_RO(ddr_data_rate_point_2);
 static DEVICE_ATTR_RO(ddr_data_rate_point_3);
 static DEVICE_ATTR_RW(rfi_disable);
 
+static ssize_t rfi_restriction_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	u16 cmd_id = 0x0008;
+	u32 cmd_resp;
+	u32 input;
+	int ret;
+
+	ret = kstrtou32(buf, 10, &input);
+	if (ret)
+		return ret;
+
+	ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id, input, &cmd_resp);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static ssize_t rfi_restriction_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	u16 cmd_id = 0x0007;
+	u32 cmd_resp;
+	int ret;
+
+	ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id, 0, &cmd_resp);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u\n", cmd_resp);
+}
+
+static ssize_t ddr_data_rate_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	u16 cmd_id = 0x0107;
+	u32 cmd_resp;
+	int ret;
+
+	ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id, 0, &cmd_resp);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u\n", cmd_resp);
+}
+
+static DEVICE_ATTR_RW(rfi_restriction);
+static DEVICE_ATTR_RO(ddr_data_rate);
+
 static struct attribute *dvfs_attrs[] = {
 	&dev_attr_rfi_restriction_run_busy.attr,
 	&dev_attr_rfi_restriction_err_code.attr,
@@ -199,6 +252,8 @@ static struct attribute *dvfs_attrs[] = {
 	&dev_attr_ddr_data_rate_point_2.attr,
 	&dev_attr_ddr_data_rate_point_3.attr,
 	&dev_attr_rfi_disable.attr,
+	&dev_attr_ddr_data_rate.attr,
+	&dev_attr_rfi_restriction.attr,
 	NULL
 };
 
-- 
2.27.0