![Stephen Kitt](/assets/img/avatar_default.png)
Many hwmon drivers don't use the id information provided by the old i2c probe function, and the remainder can easily be adapted to the new form ("probe_new") by calling i2c_match_id explicitly. This avoids scanning the identifier tables during probes. Drivers which didn't use the id are converted as-is; drivers which did are modified as follows: * if the information in i2c_client is sufficient, that's used instead (client->name); * anything else is handled by calling i2c_match_id() with the same level of error-handling (if any) as before. A few drivers aren't included in this patch because they have a different set of maintainers. They will be covered by other patches. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
523 lines
14 KiB
C
523 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Lineage Compact Power Line series of power entry modules.
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*
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* Copyright (C) 2010, 2011 Ericsson AB.
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*
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* Documentation:
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* http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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/*
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* This driver supports various Lineage Compact Power Line DC/DC and AC/DC
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* converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.
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*
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* The devices are nominally PMBus compliant. However, most standard PMBus
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* commands are not supported. Specifically, all hardware monitoring and
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* status reporting commands are non-standard. For this reason, a standard
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* PMBus driver can not be used.
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*
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* All Lineage CPL devices have a built-in I2C bus master selector (PCA9541).
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* To ensure device access, this driver should only be used as client driver
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* to the pca9541 I2C master selector driver.
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*/
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/* Command codes */
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#define PEM_OPERATION 0x01
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#define PEM_CLEAR_INFO_FLAGS 0x03
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#define PEM_VOUT_COMMAND 0x21
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#define PEM_VOUT_OV_FAULT_LIMIT 0x40
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#define PEM_READ_DATA_STRING 0xd0
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#define PEM_READ_INPUT_STRING 0xdc
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#define PEM_READ_FIRMWARE_REV 0xdd
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#define PEM_READ_RUN_TIMER 0xde
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#define PEM_FAN_HI_SPEED 0xdf
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#define PEM_FAN_NORMAL_SPEED 0xe0
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#define PEM_READ_FAN_SPEED 0xe1
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/* offsets in data string */
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#define PEM_DATA_STATUS_2 0
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#define PEM_DATA_STATUS_1 1
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#define PEM_DATA_ALARM_2 2
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#define PEM_DATA_ALARM_1 3
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#define PEM_DATA_VOUT_LSB 4
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#define PEM_DATA_VOUT_MSB 5
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#define PEM_DATA_CURRENT 6
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#define PEM_DATA_TEMP 7
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/* Virtual entries, to report constants */
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#define PEM_DATA_TEMP_MAX 10
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#define PEM_DATA_TEMP_CRIT 11
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/* offsets in input string */
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#define PEM_INPUT_VOLTAGE 0
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#define PEM_INPUT_POWER_LSB 1
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#define PEM_INPUT_POWER_MSB 2
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/* offsets in fan data */
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#define PEM_FAN_ADJUSTMENT 0
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#define PEM_FAN_FAN1 1
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#define PEM_FAN_FAN2 2
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#define PEM_FAN_FAN3 3
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/* Status register bits */
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#define STS1_OUTPUT_ON (1 << 0)
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#define STS1_LEDS_FLASHING (1 << 1)
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#define STS1_EXT_FAULT (1 << 2)
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#define STS1_SERVICE_LED_ON (1 << 3)
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#define STS1_SHUTDOWN_OCCURRED (1 << 4)
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#define STS1_INT_FAULT (1 << 5)
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#define STS1_ISOLATION_TEST_OK (1 << 6)
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#define STS2_ENABLE_PIN_HI (1 << 0)
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#define STS2_DATA_OUT_RANGE (1 << 1)
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#define STS2_RESTARTED_OK (1 << 1)
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#define STS2_ISOLATION_TEST_FAIL (1 << 3)
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#define STS2_HIGH_POWER_CAP (1 << 4)
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#define STS2_INVALID_INSTR (1 << 5)
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#define STS2_WILL_RESTART (1 << 6)
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#define STS2_PEC_ERR (1 << 7)
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/* Alarm register bits */
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#define ALRM1_VIN_OUT_LIMIT (1 << 0)
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#define ALRM1_VOUT_OUT_LIMIT (1 << 1)
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#define ALRM1_OV_VOLT_SHUTDOWN (1 << 2)
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#define ALRM1_VIN_OVERCURRENT (1 << 3)
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#define ALRM1_TEMP_WARNING (1 << 4)
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#define ALRM1_TEMP_SHUTDOWN (1 << 5)
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#define ALRM1_PRIMARY_FAULT (1 << 6)
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#define ALRM1_POWER_LIMIT (1 << 7)
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#define ALRM2_5V_OUT_LIMIT (1 << 1)
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#define ALRM2_TEMP_FAULT (1 << 2)
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#define ALRM2_OV_LOW (1 << 3)
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#define ALRM2_DCDC_TEMP_HIGH (1 << 4)
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#define ALRM2_PRI_TEMP_HIGH (1 << 5)
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#define ALRM2_NO_PRIMARY (1 << 6)
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#define ALRM2_FAN_FAULT (1 << 7)
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#define FIRMWARE_REV_LEN 4
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#define DATA_STRING_LEN 9
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#define INPUT_STRING_LEN 5 /* 4 for most devices */
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#define FAN_SPEED_LEN 5
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struct pem_data {
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struct i2c_client *client;
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const struct attribute_group *groups[4];
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struct mutex update_lock;
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bool valid;
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bool fans_supported;
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int input_length;
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unsigned long last_updated; /* in jiffies */
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u8 firmware_rev[FIRMWARE_REV_LEN];
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u8 data_string[DATA_STRING_LEN];
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u8 input_string[INPUT_STRING_LEN];
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u8 fan_speed[FAN_SPEED_LEN];
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};
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static int pem_read_block(struct i2c_client *client, u8 command, u8 *data,
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int data_len)
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{
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX];
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int result;
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result = i2c_smbus_read_block_data(client, command, block_buffer);
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if (unlikely(result < 0))
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goto abort;
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if (unlikely(result == 0xff || result != data_len)) {
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result = -EIO;
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goto abort;
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}
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memcpy(data, block_buffer, data_len);
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result = 0;
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abort:
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return result;
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}
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static struct pem_data *pem_update_device(struct device *dev)
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{
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struct pem_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct pem_data *ret = data;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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int result;
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/* Read data string */
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result = pem_read_block(client, PEM_READ_DATA_STRING,
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data->data_string,
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sizeof(data->data_string));
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if (unlikely(result < 0)) {
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ret = ERR_PTR(result);
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goto abort;
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}
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/* Read input string */
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if (data->input_length) {
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result = pem_read_block(client, PEM_READ_INPUT_STRING,
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data->input_string,
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data->input_length);
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if (unlikely(result < 0)) {
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ret = ERR_PTR(result);
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goto abort;
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}
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}
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/* Read fan speeds */
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if (data->fans_supported) {
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result = pem_read_block(client, PEM_READ_FAN_SPEED,
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data->fan_speed,
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sizeof(data->fan_speed));
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if (unlikely(result < 0)) {
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ret = ERR_PTR(result);
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goto abort;
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}
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}
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i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static long pem_get_data(u8 *data, int len, int index)
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{
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long val;
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switch (index) {
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case PEM_DATA_VOUT_LSB:
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val = (data[index] + (data[index+1] << 8)) * 5 / 2;
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break;
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case PEM_DATA_CURRENT:
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val = data[index] * 200;
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break;
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case PEM_DATA_TEMP:
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val = data[index] * 1000;
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break;
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case PEM_DATA_TEMP_MAX:
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val = 97 * 1000; /* 97 degrees C per datasheet */
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break;
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case PEM_DATA_TEMP_CRIT:
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val = 107 * 1000; /* 107 degrees C per datasheet */
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break;
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default:
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WARN_ON_ONCE(1);
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val = 0;
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}
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return val;
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}
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static long pem_get_input(u8 *data, int len, int index)
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{
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long val;
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switch (index) {
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case PEM_INPUT_VOLTAGE:
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if (len == INPUT_STRING_LEN)
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val = (data[index] + (data[index+1] << 8) - 75) * 1000;
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else
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val = (data[index] - 75) * 1000;
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break;
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case PEM_INPUT_POWER_LSB:
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if (len == INPUT_STRING_LEN)
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index++;
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val = (data[index] + (data[index+1] << 8)) * 1000000L;
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break;
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default:
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WARN_ON_ONCE(1);
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val = 0;
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}
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return val;
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}
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static long pem_get_fan(u8 *data, int len, int index)
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{
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long val;
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switch (index) {
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case PEM_FAN_FAN1:
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case PEM_FAN_FAN2:
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case PEM_FAN_FAN3:
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val = data[index] * 100;
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break;
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default:
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WARN_ON_ONCE(1);
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val = 0;
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}
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return val;
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}
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/*
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* Show boolean, either a fault or an alarm.
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* .nr points to the register, .index is the bit mask to check
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*/
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static ssize_t pem_bool_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
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struct pem_data *data = pem_update_device(dev);
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u8 status;
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if (IS_ERR(data))
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return PTR_ERR(data);
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status = data->data_string[attr->nr] & attr->index;
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return snprintf(buf, PAGE_SIZE, "%d\n", !!status);
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}
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static ssize_t pem_data_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct pem_data *data = pem_update_device(dev);
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long value;
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if (IS_ERR(data))
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return PTR_ERR(data);
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value = pem_get_data(data->data_string, sizeof(data->data_string),
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attr->index);
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return snprintf(buf, PAGE_SIZE, "%ld\n", value);
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}
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static ssize_t pem_input_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct pem_data *data = pem_update_device(dev);
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long value;
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if (IS_ERR(data))
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return PTR_ERR(data);
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value = pem_get_input(data->input_string, sizeof(data->input_string),
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attr->index);
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return snprintf(buf, PAGE_SIZE, "%ld\n", value);
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}
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static ssize_t pem_fan_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct pem_data *data = pem_update_device(dev);
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long value;
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if (IS_ERR(data))
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return PTR_ERR(data);
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value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed),
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attr->index);
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return snprintf(buf, PAGE_SIZE, "%ld\n", value);
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}
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/* Voltages */
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static SENSOR_DEVICE_ATTR_RO(in1_input, pem_data, PEM_DATA_VOUT_LSB);
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static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_VOUT_OUT_LIMIT);
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static SENSOR_DEVICE_ATTR_2_RO(in1_crit_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_OV_VOLT_SHUTDOWN);
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static SENSOR_DEVICE_ATTR_RO(in2_input, pem_input, PEM_INPUT_VOLTAGE);
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static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT);
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/* Currents */
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static SENSOR_DEVICE_ATTR_RO(curr1_input, pem_data, PEM_DATA_CURRENT);
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static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_VIN_OVERCURRENT);
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/* Power */
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static SENSOR_DEVICE_ATTR_RO(power1_input, pem_input, PEM_INPUT_POWER_LSB);
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static SENSOR_DEVICE_ATTR_2_RO(power1_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_POWER_LIMIT);
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/* Fans */
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static SENSOR_DEVICE_ATTR_RO(fan1_input, pem_fan, PEM_FAN_FAN1);
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static SENSOR_DEVICE_ATTR_RO(fan2_input, pem_fan, PEM_FAN_FAN2);
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static SENSOR_DEVICE_ATTR_RO(fan3_input, pem_fan, PEM_FAN_FAN3);
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static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, pem_bool, PEM_DATA_ALARM_2,
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ALRM2_FAN_FAULT);
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/* Temperatures */
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static SENSOR_DEVICE_ATTR_RO(temp1_input, pem_data, PEM_DATA_TEMP);
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static SENSOR_DEVICE_ATTR_RO(temp1_max, pem_data, PEM_DATA_TEMP_MAX);
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static SENSOR_DEVICE_ATTR_RO(temp1_crit, pem_data, PEM_DATA_TEMP_CRIT);
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static SENSOR_DEVICE_ATTR_2_RO(temp1_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_TEMP_WARNING);
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static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, pem_bool, PEM_DATA_ALARM_1,
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ALRM1_TEMP_SHUTDOWN);
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static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, pem_bool, PEM_DATA_ALARM_2,
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ALRM2_TEMP_FAULT);
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static struct attribute *pem_attributes[] = {
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_alarm.dev_attr.attr,
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&sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_in2_alarm.dev_attr.attr,
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&sensor_dev_attr_curr1_alarm.dev_attr.attr,
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&sensor_dev_attr_power1_alarm.dev_attr.attr,
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&sensor_dev_attr_fan1_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_fault.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group pem_group = {
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.attrs = pem_attributes,
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};
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static struct attribute *pem_input_attributes[] = {
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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&sensor_dev_attr_power1_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group pem_input_group = {
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.attrs = pem_input_attributes,
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};
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static struct attribute *pem_fan_attributes[] = {
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&sensor_dev_attr_fan1_input.dev_attr.attr,
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&sensor_dev_attr_fan2_input.dev_attr.attr,
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&sensor_dev_attr_fan3_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group pem_fan_group = {
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.attrs = pem_fan_attributes,
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};
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static int pem_probe(struct i2c_client *client)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct pem_data *data;
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int ret, idx = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA
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| I2C_FUNC_SMBUS_WRITE_BYTE))
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return -ENODEV;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = client;
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mutex_init(&data->update_lock);
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/*
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* We use the next two commands to determine if the device is really
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* there.
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*/
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ret = pem_read_block(client, PEM_READ_FIRMWARE_REV,
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data->firmware_rev, sizeof(data->firmware_rev));
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
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if (ret < 0)
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return ret;
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dev_info(dev, "Firmware revision %d.%d.%d\n",
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data->firmware_rev[0], data->firmware_rev[1],
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data->firmware_rev[2]);
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/* sysfs hooks */
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data->groups[idx++] = &pem_group;
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/*
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* Check if input readings are supported.
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* This is the case if we can read input data,
|
|
* and if the returned data is not all zeros.
|
|
* Note that input alarms are always supported.
|
|
*/
|
|
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
|
|
data->input_string,
|
|
sizeof(data->input_string) - 1);
|
|
if (!ret && (data->input_string[0] || data->input_string[1] ||
|
|
data->input_string[2]))
|
|
data->input_length = sizeof(data->input_string) - 1;
|
|
else if (ret < 0) {
|
|
/* Input string is one byte longer for some devices */
|
|
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
|
|
data->input_string,
|
|
sizeof(data->input_string));
|
|
if (!ret && (data->input_string[0] || data->input_string[1] ||
|
|
data->input_string[2] || data->input_string[3]))
|
|
data->input_length = sizeof(data->input_string);
|
|
}
|
|
|
|
if (data->input_length)
|
|
data->groups[idx++] = &pem_input_group;
|
|
|
|
/*
|
|
* Check if fan speed readings are supported.
|
|
* This is the case if we can read fan speed data,
|
|
* and if the returned data is not all zeros.
|
|
* Note that the fan alarm is always supported.
|
|
*/
|
|
ret = pem_read_block(client, PEM_READ_FAN_SPEED,
|
|
data->fan_speed,
|
|
sizeof(data->fan_speed));
|
|
if (!ret && (data->fan_speed[0] || data->fan_speed[1] ||
|
|
data->fan_speed[2] || data->fan_speed[3])) {
|
|
data->fans_supported = true;
|
|
data->groups[idx++] = &pem_fan_group;
|
|
}
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data, data->groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id pem_id[] = {
|
|
{"lineage_pem", 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pem_id);
|
|
|
|
static struct i2c_driver pem_driver = {
|
|
.driver = {
|
|
.name = "lineage_pem",
|
|
},
|
|
.probe_new = pem_probe,
|
|
.id_table = pem_id,
|
|
};
|
|
|
|
module_i2c_driver(pem_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver");
|
|
MODULE_LICENSE("GPL");
|