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The OCC driver limits the rate of sending poll commands to the OCC. If a user reads a hwmon entry after a poll response resulted in an error and is rate-limited, the error is invisible to the user. Fix this by storing the last error and returning that in the rate-limited case. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/* Copyright IBM Corp 2019 */
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#ifndef OCC_COMMON_H
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#define OCC_COMMON_H
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#include <linux/hwmon-sysfs.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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struct device;
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#define OCC_RESP_DATA_BYTES 4089
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/*
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* Same response format for all OCC versions.
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* Allocate the largest possible response.
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*/
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struct occ_response {
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u8 seq_no;
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u8 cmd_type;
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u8 return_status;
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__be16 data_length;
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u8 data[OCC_RESP_DATA_BYTES];
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__be16 checksum;
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} __packed;
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struct occ_sensor_data_block_header {
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u8 eye_catcher[4];
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u8 reserved;
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u8 sensor_format;
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u8 sensor_length;
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u8 num_sensors;
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} __packed;
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struct occ_sensor_data_block {
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struct occ_sensor_data_block_header header;
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u32 data;
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} __packed;
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struct occ_poll_response_header {
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u8 status;
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u8 ext_status;
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u8 occs_present;
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u8 config_data;
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u8 occ_state;
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u8 mode;
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u8 ips_status;
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u8 error_log_id;
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__be32 error_log_start_address;
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__be16 error_log_length;
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u16 reserved;
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u8 occ_code_level[16];
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u8 eye_catcher[6];
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u8 num_sensor_data_blocks;
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u8 sensor_data_block_header_version;
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} __packed;
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struct occ_poll_response {
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struct occ_poll_response_header header;
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struct occ_sensor_data_block block;
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} __packed;
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struct occ_sensor {
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u8 num_sensors;
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u8 version;
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void *data; /* pointer to sensor data start within response */
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};
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/*
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* OCC only provides one sensor data block of each type, but any number of
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* sensors within that block.
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*/
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struct occ_sensors {
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struct occ_sensor temp;
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struct occ_sensor freq;
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struct occ_sensor power;
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struct occ_sensor caps;
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struct occ_sensor extended;
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};
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/*
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* Use our own attribute struct so we can dynamically allocate space for the
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* name.
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*/
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struct occ_attribute {
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char name[32];
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struct sensor_device_attribute_2 sensor;
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};
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struct occ {
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struct device *bus_dev;
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struct occ_response resp;
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struct occ_sensors sensors;
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int powr_sample_time_us; /* average power sample time */
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u8 poll_cmd_data; /* to perform OCC poll command */
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int (*send_cmd)(struct occ *occ, u8 *cmd);
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unsigned long last_update;
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struct mutex lock; /* lock OCC access */
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struct device *hwmon;
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struct occ_attribute *attrs;
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struct attribute_group group;
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const struct attribute_group *groups[2];
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int error; /* final transfer error after retry */
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int last_error; /* latest transfer error */
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unsigned int error_count; /* number of xfr errors observed */
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unsigned long last_safe; /* time OCC entered "safe" state */
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/*
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* Store the previous state data for comparison in order to notify
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* sysfs readers of state changes.
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*/
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int prev_error;
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u8 prev_stat;
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u8 prev_ext_stat;
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u8 prev_occs_present;
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};
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int occ_setup(struct occ *occ, const char *name);
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int occ_setup_sysfs(struct occ *occ);
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void occ_shutdown(struct occ *occ);
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void occ_sysfs_poll_done(struct occ *occ);
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int occ_update_response(struct occ *occ);
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#endif /* OCC_COMMON_H */
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