hwmon (occ): Add sensor types and versions

Add structures to define all sensor types and versions. Add sysfs show
and store functions for each sensor type. Add a method to construct the
"set user power cap" command and send it to the OCC. Add rate limit to
polling the OCC (in case user-space reads our hwmon entries rapidly).

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/occ/common.h

@@ -3,6 +3,8 @@
 #ifndef OCC_COMMON_H
 #define OCC_COMMON_H
 
+#include <linux/mutex.h>
+
 struct device;
 
 #define OCC_RESP_DATA_BYTES		4089
@@ -80,8 +82,12 @@ struct occ {
 	struct occ_response resp;
 	struct occ_sensors sensors;
 
+	int powr_sample_time_us;	/* average power sample time */
 	u8 poll_cmd_data;		/* to perform OCC poll command */
 	int (*send_cmd)(struct occ *occ, u8 *cmd);
+
+	unsigned long last_update;
+	struct mutex lock;		/* lock OCC access */
 };
 
 int occ_setup(struct occ *occ, const char *name);

drivers/hwmon/occ/p8_i2c.c

@@ -216,6 +216,7 @@ static int p8_i2c_occ_probe(struct i2c_client *client,
 	occ->bus_dev = &client->dev;
 	dev_set_drvdata(&client->dev, occ);
 
+	occ->powr_sample_time_us = 250;
 	occ->poll_cmd_data = 0x10;		/* P8 OCC poll data */
 	occ->send_cmd = p8_i2c_occ_send_cmd;
 

drivers/hwmon/occ/p9_sbe.c

@@ -69,6 +69,7 @@ static int p9_sbe_occ_probe(struct platform_device *pdev)
 	occ->bus_dev = &pdev->dev;
 	platform_set_drvdata(pdev, occ);
 
+	occ->powr_sample_time_us = 500;
 	occ->poll_cmd_data = 0x20;		/* P9 OCC poll data */
 	occ->send_cmd = p9_sbe_occ_send_cmd;