440 lines
11 KiB
C
440 lines
11 KiB
C
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/*
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* Copyright 2017 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/i2c.h>
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#include <linux/jiffies.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/pmbus.h>
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#include "pmbus.h"
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#define CFFPS_FRU_CMD 0x9A
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#define CFFPS_PN_CMD 0x9B
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#define CFFPS_SN_CMD 0x9E
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#define CFFPS_CCIN_CMD 0xBD
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#define CFFPS_FW_CMD_START 0xFA
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#define CFFPS_FW_NUM_BYTES 4
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#define CFFPS_SYS_CONFIG_CMD 0xDA
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#define CFFPS_INPUT_HISTORY_CMD 0xD6
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#define CFFPS_INPUT_HISTORY_SIZE 100
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/* STATUS_MFR_SPECIFIC bits */
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#define CFFPS_MFR_FAN_FAULT BIT(0)
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#define CFFPS_MFR_THERMAL_FAULT BIT(1)
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#define CFFPS_MFR_OV_FAULT BIT(2)
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#define CFFPS_MFR_UV_FAULT BIT(3)
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#define CFFPS_MFR_PS_KILL BIT(4)
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#define CFFPS_MFR_OC_FAULT BIT(5)
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#define CFFPS_MFR_VAUX_FAULT BIT(6)
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#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
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#define CFFPS_LED_BLINK BIT(0)
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#define CFFPS_LED_ON BIT(1)
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#define CFFPS_LED_OFF BIT(2)
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#define CFFPS_BLINK_RATE_MS 250
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enum {
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CFFPS_DEBUGFS_INPUT_HISTORY = 0,
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CFFPS_DEBUGFS_FRU,
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CFFPS_DEBUGFS_PN,
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CFFPS_DEBUGFS_SN,
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CFFPS_DEBUGFS_CCIN,
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CFFPS_DEBUGFS_FW,
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CFFPS_DEBUGFS_NUM_ENTRIES
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};
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struct ibm_cffps_input_history {
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struct mutex update_lock;
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unsigned long last_update;
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u8 byte_count;
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u8 data[CFFPS_INPUT_HISTORY_SIZE];
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};
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struct ibm_cffps {
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struct i2c_client *client;
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struct ibm_cffps_input_history input_history;
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int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
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char led_name[32];
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u8 led_state;
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struct led_classdev led;
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};
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#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
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static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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int rc;
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u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
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u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
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struct i2c_msg msg[2] = {
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{
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.addr = psu->client->addr,
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.flags = psu->client->flags,
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.len = 1,
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.buf = msgbuf0,
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}, {
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.addr = psu->client->addr,
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.flags = psu->client->flags | I2C_M_RD,
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.len = CFFPS_INPUT_HISTORY_SIZE + 1,
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.buf = msgbuf1,
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},
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};
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if (!*ppos) {
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mutex_lock(&psu->input_history.update_lock);
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if (time_after(jiffies, psu->input_history.last_update + HZ)) {
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/*
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* Use a raw i2c transfer, since we need more bytes
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* than Linux I2C supports through smbus xfr (only 32).
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*/
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rc = i2c_transfer(psu->client->adapter, msg, 2);
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if (rc < 0) {
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mutex_unlock(&psu->input_history.update_lock);
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return rc;
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}
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psu->input_history.byte_count = msgbuf1[0];
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memcpy(psu->input_history.data, &msgbuf1[1],
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CFFPS_INPUT_HISTORY_SIZE);
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psu->input_history.last_update = jiffies;
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}
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mutex_unlock(&psu->input_history.update_lock);
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}
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return simple_read_from_buffer(buf, count, ppos,
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psu->input_history.data,
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psu->input_history.byte_count);
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}
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static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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u8 cmd;
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int i, rc;
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int *idxp = file->private_data;
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int idx = *idxp;
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struct ibm_cffps *psu = to_psu(idxp, idx);
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char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
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switch (idx) {
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case CFFPS_DEBUGFS_INPUT_HISTORY:
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return ibm_cffps_read_input_history(psu, buf, count, ppos);
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case CFFPS_DEBUGFS_FRU:
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cmd = CFFPS_FRU_CMD;
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break;
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case CFFPS_DEBUGFS_PN:
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cmd = CFFPS_PN_CMD;
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break;
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case CFFPS_DEBUGFS_SN:
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cmd = CFFPS_SN_CMD;
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break;
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case CFFPS_DEBUGFS_CCIN:
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rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
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if (rc < 0)
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return rc;
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rc = snprintf(data, 5, "%04X", rc);
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goto done;
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case CFFPS_DEBUGFS_FW:
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for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
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rc = i2c_smbus_read_byte_data(psu->client,
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CFFPS_FW_CMD_START + i);
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if (rc < 0)
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return rc;
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snprintf(&data[i * 2], 3, "%02X", rc);
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}
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rc = i * 2;
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goto done;
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default:
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return -EINVAL;
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}
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rc = i2c_smbus_read_block_data(psu->client, cmd, data);
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if (rc < 0)
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return rc;
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done:
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data[rc] = '\n';
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rc += 2;
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return simple_read_from_buffer(buf, count, ppos, data, rc);
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}
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static const struct file_operations ibm_cffps_fops = {
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.llseek = noop_llseek,
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.read = ibm_cffps_debugfs_op,
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.open = simple_open,
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};
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static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
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int reg)
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{
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int rc, mfr;
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switch (reg) {
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case PMBUS_STATUS_VOUT:
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case PMBUS_STATUS_IOUT:
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case PMBUS_STATUS_TEMPERATURE:
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case PMBUS_STATUS_FAN_12:
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rc = pmbus_read_byte_data(client, page, reg);
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if (rc < 0)
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return rc;
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mfr = pmbus_read_byte_data(client, page,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfr < 0)
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/*
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* Return the status register instead of an error,
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* since we successfully read status.
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*/
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return rc;
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/* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
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if (reg == PMBUS_STATUS_FAN_12) {
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if (mfr & CFFPS_MFR_FAN_FAULT)
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rc |= PB_FAN_FAN1_FAULT;
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} else if (reg == PMBUS_STATUS_TEMPERATURE) {
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if (mfr & CFFPS_MFR_THERMAL_FAULT)
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rc |= PB_TEMP_OT_FAULT;
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} else if (reg == PMBUS_STATUS_VOUT) {
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if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
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rc |= PB_VOLTAGE_OV_FAULT;
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if (mfr & CFFPS_MFR_UV_FAULT)
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rc |= PB_VOLTAGE_UV_FAULT;
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} else if (reg == PMBUS_STATUS_IOUT) {
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if (mfr & CFFPS_MFR_OC_FAULT)
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rc |= PB_IOUT_OC_FAULT;
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if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
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rc |= PB_CURRENT_SHARE_FAULT;
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}
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break;
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default:
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rc = -ENODATA;
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break;
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}
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return rc;
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}
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static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
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int reg)
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{
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int rc, mfr;
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switch (reg) {
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case PMBUS_STATUS_WORD:
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rc = pmbus_read_word_data(client, page, reg);
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if (rc < 0)
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return rc;
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mfr = pmbus_read_byte_data(client, page,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfr < 0)
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/*
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* Return the status register instead of an error,
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* since we successfully read status.
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*/
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return rc;
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if (mfr & CFFPS_MFR_PS_KILL)
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rc |= PB_STATUS_OFF;
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break;
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default:
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rc = -ENODATA;
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break;
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}
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return rc;
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}
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static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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int rc;
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struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
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if (brightness == LED_OFF) {
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psu->led_state = CFFPS_LED_OFF;
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} else {
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brightness = LED_FULL;
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if (psu->led_state != CFFPS_LED_BLINK)
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psu->led_state = CFFPS_LED_ON;
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}
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rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
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psu->led_state);
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if (rc < 0)
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return rc;
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led_cdev->brightness = brightness;
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return 0;
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}
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static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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int rc;
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struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
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psu->led_state = CFFPS_LED_BLINK;
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if (led_cdev->brightness == LED_OFF)
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return 0;
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rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
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CFFPS_LED_BLINK);
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if (rc < 0)
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return rc;
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*delay_on = CFFPS_BLINK_RATE_MS;
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*delay_off = CFFPS_BLINK_RATE_MS;
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return 0;
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}
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static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
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{
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int rc;
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struct i2c_client *client = psu->client;
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struct device *dev = &client->dev;
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snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
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client->addr);
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psu->led.name = psu->led_name;
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psu->led.max_brightness = LED_FULL;
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psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
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psu->led.blink_set = ibm_cffps_led_blink_set;
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rc = devm_led_classdev_register(dev, &psu->led);
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if (rc)
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dev_warn(dev, "failed to register led class: %d\n", rc);
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}
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static struct pmbus_driver_info ibm_cffps_info = {
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.pages = 1,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
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.read_byte_data = ibm_cffps_read_byte_data,
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.read_word_data = ibm_cffps_read_word_data,
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};
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static struct pmbus_platform_data ibm_cffps_pdata = {
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.flags = PMBUS_SKIP_STATUS_CHECK,
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};
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static int ibm_cffps_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int i, rc;
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struct dentry *debugfs;
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struct dentry *ibm_cffps_dir;
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struct ibm_cffps *psu;
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client->dev.platform_data = &ibm_cffps_pdata;
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|
|
rc = pmbus_do_probe(client, id, &ibm_cffps_info);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Don't fail the probe if there isn't enough memory for leds and
|
||
|
|
* debugfs.
|
||
|
|
*/
|
||
|
|
psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
|
||
|
|
if (!psu)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
psu->client = client;
|
||
|
|
mutex_init(&psu->input_history.update_lock);
|
||
|
|
psu->input_history.last_update = jiffies - HZ;
|
||
|
|
|
||
|
|
ibm_cffps_create_led_class(psu);
|
||
|
|
|
||
|
|
/* Don't fail the probe if we can't create debugfs */
|
||
|
|
debugfs = pmbus_get_debugfs_dir(client);
|
||
|
|
if (!debugfs)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
|
||
|
|
if (!ibm_cffps_dir)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
|
||
|
|
psu->debugfs_entries[i] = i;
|
||
|
|
|
||
|
|
debugfs_create_file("input_history", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
debugfs_create_file("fru", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
debugfs_create_file("part_number", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_PN],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_SN],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
debugfs_create_file("ccin", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
|
||
|
|
&psu->debugfs_entries[CFFPS_DEBUGFS_FW],
|
||
|
|
&ibm_cffps_fops);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id ibm_cffps_id[] = {
|
||
|
|
{ "ibm_cffps1", 1 },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
|
||
|
|
|
||
|
|
static const struct of_device_id ibm_cffps_of_match[] = {
|
||
|
|
{ .compatible = "ibm,cffps1" },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
|
||
|
|
|
||
|
|
static struct i2c_driver ibm_cffps_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "ibm-cffps",
|
||
|
|
.of_match_table = ibm_cffps_of_match,
|
||
|
|
},
|
||
|
|
.probe = ibm_cffps_probe,
|
||
|
|
.remove = pmbus_do_remove,
|
||
|
|
.id_table = ibm_cffps_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(ibm_cffps_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Eddie James");
|
||
|
|
MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
|
||
|
|
MODULE_LICENSE("GPL");
|