[PATCH 4/5] amd_sfh:Add support for PM suspend and resume

[Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>]

Add support for power management routines.

Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
---
 drivers/hid/amd-sfh-hid/amd_sfh_client.c |  1 -
 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c   | 49 ++++++++++++++++++++++++
 drivers/hid/amd-sfh-hid/amd_sfh_pcie.h   |  5 +++
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_client.c b/drivers/hid/amd-sfh-hid/amd_sfh_client.c
index 4982ccf9dc25..050df796aa2e 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_client.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_client.c
@@ -17,7 +17,6 @@
 #include "amd_sfh_pcie.h"
 #include "amd_sfh_hid.h"
 
-#define AMD_SFH_IDLE_LOOP	200
 
 struct request_list {
 	struct hid_device *hid;
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
index fd2e3011086d..bdef47118c3d 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -264,6 +264,54 @@ static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
 	return amd_sfh_hid_client_init(privdata);
 }
 
+static int __maybe_unused amd_mp2_pci_resume(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct amd_mp2_dev *mp2 = pci_get_drvdata(pdev);
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	struct amd_mp2_sensor_info info;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_sts[i] == SENSOR_DISABLED) {
+			info.period = AMD_SFH_IDLE_LOOP;
+			info.sensor_idx = cl_data->sensor_idx[i];
+			info.dma_address = cl_data->sensor_dma_addr[i];
+			mp2->mp2_ops->start(mp2, info);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], SENSOR_ENABLED);
+			if (status == SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_ENABLED;
+		}
+	}
+
+	return 0;
+}
+
+static int __maybe_unused amd_mp2_pci_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct amd_mp2_dev *mp2 = pci_get_drvdata(pdev);
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_idx[i] != HPD_IDX &&
+		    cl_data->sensor_sts[i] == SENSOR_ENABLED) {
+			mp2->mp2_ops->stop(mp2, cl_data->sensor_idx[i]);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], SENSOR_DISABLED);
+			if (status != SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_DISABLED;
+		}
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(amd_mp2_pm_ops, amd_mp2_pci_suspend,
+		amd_mp2_pci_resume);
+
 static const struct pci_device_id amd_mp2_pci_tbl[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2) },
 	{ }
@@ -274,6 +322,7 @@ static struct pci_driver amd_mp2_pci_driver = {
 	.name		= DRIVER_NAME,
 	.id_table	= amd_mp2_pci_tbl,
 	.probe		= amd_mp2_pci_probe,
+	.driver.pm	= &amd_mp2_pm_ops,
 };
 module_pci_driver(amd_mp2_pci_driver);
 
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
index 21ef55da712a..1ff6f83cb6fd 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
@@ -36,6 +36,8 @@
 
 #define HPD_IDX		16
 
+#define AMD_SFH_IDLE_LOOP	200
+
 /* SFH Command register */
 union sfh_cmd_base {
 	u32 ul;
@@ -129,6 +131,9 @@ void amd_stop_all_sensors(struct amd_mp2_dev *privdata);
 int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id);
 int amd_sfh_hid_client_init(struct amd_mp2_dev *privdata);
 int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata);
+u32 amd_sfh_wait_for_response(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
+void amd_mp2_suspend(struct amd_mp2_dev *mp2);
+void amd_mp2_resume(struct amd_mp2_dev *mp2);
 
 struct amd_mp2_ops {
 	 void (*start)(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info);
-- 
2.25.1