--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Delta modules, Q54SJ108A2 series 1/4 Brick DC/DC
+ * Regulated Power Module
+ *
+ * Copyright 2020 Delta LLC.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+#define STORE_DEFAULT_ALL 0x11
+#define ERASE_BLACKBOX_DATA 0xD1
+#define READ_HISTORY_EVENT_NUMBER 0xD2
+#define READ_HISTORY_EVENTS 0xE0
+#define SET_HISTORY_EVENT_OFFSET 0xE1
+#define PMBUS_FLASH_KEY_WRITE 0xEC
+
+enum chips {
+ q54sj108a2
+};
+
+enum {
+ Q54SJ108A2_DEBUGFS_OPERATION = 0,
+ Q54SJ108A2_DEBUGFS_CLEARFAULT,
+ Q54SJ108A2_DEBUGFS_WRITEPROTECT,
+ Q54SJ108A2_DEBUGFS_STOREDEFAULT,
+ Q54SJ108A2_DEBUGFS_VOOV_RESPONSE,
+ Q54SJ108A2_DEBUGFS_IOOC_RESPONSE,
+ Q54SJ108A2_DEBUGFS_PMBUS_VERSION,
+ Q54SJ108A2_DEBUGFS_MFR_ID,
+ Q54SJ108A2_DEBUGFS_MFR_MODEL,
+ Q54SJ108A2_DEBUGFS_MFR_REVISION,
+ Q54SJ108A2_DEBUGFS_MFR_LOCATION,
+ Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE,
+ Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET,
+ Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET,
+ Q54SJ108A2_DEBUGFS_BLACKBOX_READ,
+ Q54SJ108A2_DEBUGFS_FLASH_KEY,
+ Q54SJ108A2_DEBUGFS_NUM_ENTRIES
+};
+
+struct q54sj108a2_data {
+ enum chips chip;
+ struct i2c_client *client;
+
+ int debugfs_entries[Q54SJ108A2_DEBUGFS_NUM_ENTRIES];
+};
+
+#define to_psu(x, y) container_of((x), struct q54sj108a2_data, debugfs_entries[(y)])
+
+static struct pmbus_driver_info q54sj108a2_info[] = {
+ [q54sj108a2] = {
+ .pages = 1,
+
+ /* Source : Delta Q54SJ108A2 */
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+
+ .func[0] = PMBUS_HAVE_VIN |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_STATUS_INPUT,
+ },
+};
+
+static ssize_t q54sj108a2_debugfs_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct q54sj108a2_data *psu = to_psu(idxp, idx);
+ char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+ char data_char[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+ char *res;
+
+ switch (idx) {
+ case Q54SJ108A2_DEBUGFS_OPERATION:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_WRITEPROTECT:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_WRITE_PROTECT);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_VOOV_RESPONSE:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_OV_FAULT_RESPONSE);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_IOOC_RESPONSE:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_IOUT_OC_FAULT_RESPONSE);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_PMBUS_VERSION:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_MFR_ID:
+ rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_ID, data);
+ if (rc < 0)
+ return rc;
+ break;
+ case Q54SJ108A2_DEBUGFS_MFR_MODEL:
+ rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_MODEL, data);
+ if (rc < 0)
+ return rc;
+ break;
+ case Q54SJ108A2_DEBUGFS_MFR_REVISION:
+ rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_REVISION, data);
+ if (rc < 0)
+ return rc;
+ break;
+ case Q54SJ108A2_DEBUGFS_MFR_LOCATION:
+ rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_LOCATION, data);
+ if (rc < 0)
+ return rc;
+ break;
+ case Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET:
+ rc = i2c_smbus_read_byte_data(psu->client, READ_HISTORY_EVENT_NUMBER);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 3, "%02x", rc);
+ break;
+ case Q54SJ108A2_DEBUGFS_BLACKBOX_READ:
+ rc = i2c_smbus_read_block_data(psu->client, READ_HISTORY_EVENTS, data);
+ if (rc < 0)
+ return rc;
+
+ res = bin2hex(data, data_char, 32);
+ rc = res - data;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_FLASH_KEY:
+ rc = i2c_smbus_read_block_data(psu->client, PMBUS_FLASH_KEY_WRITE, data);
+ if (rc < 0)
+ return rc;
+
+ res = bin2hex(data, data_char, 4);
+ rc = res - data;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ data[rc] = '\n';
+ rc += 2;
+
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static ssize_t q54sj108a2_debugfs_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 flash_key[4];
+ u8 dst_data;
+ ssize_t rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct q54sj108a2_data *psu = to_psu(idxp, idx);
+
+ rc = i2c_smbus_write_byte_data(psu->client, PMBUS_WRITE_PROTECT, 0);
+ if (rc)
+ return rc;
+
+ switch (idx) {
+ case Q54SJ108A2_DEBUGFS_OPERATION:
+ rc = kstrtou8_from_user(buf, count, 0, &dst_data);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(psu->client, PMBUS_OPERATION, dst_data);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_CLEARFAULT:
+ rc = i2c_smbus_write_byte(psu->client, PMBUS_CLEAR_FAULTS);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_STOREDEFAULT:
+ flash_key[0] = 0x7E;
+ flash_key[1] = 0x15;
+ flash_key[2] = 0xDC;
+ flash_key[3] = 0x42;
+ rc = i2c_smbus_write_block_data(psu->client, PMBUS_FLASH_KEY_WRITE, 4, flash_key);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte(psu->client, STORE_DEFAULT_ALL);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_VOOV_RESPONSE:
+ rc = kstrtou8_from_user(buf, count, 0, &dst_data);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(psu->client, PMBUS_VOUT_OV_FAULT_RESPONSE, dst_data);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_IOOC_RESPONSE:
+ rc = kstrtou8_from_user(buf, count, 0, &dst_data);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(psu->client, PMBUS_IOUT_OC_FAULT_RESPONSE, dst_data);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE:
+ rc = i2c_smbus_write_byte(psu->client, ERASE_BLACKBOX_DATA);
+ if (rc < 0)
+ return rc;
+
+ break;
+ case Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET:
+ rc = kstrtou8_from_user(buf, count, 0, &dst_data);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(psu->client, SET_HISTORY_EVENT_OFFSET, dst_data);
+ if (rc < 0)
+ return rc;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static const struct file_operations q54sj108a2_fops = {
+ .llseek = noop_llseek,
+ .read = q54sj108a2_debugfs_read,
+ .write = q54sj108a2_debugfs_write,
+ .open = simple_open,
+};
+
+static const struct i2c_device_id q54sj108a2_id[] = {
+ { "q54sj108a2", q54sj108a2 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(i2c, q54sj108a2_id);
+
+static int q54sj108a2_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
+ enum chips chip_id;
+ int ret, i;
+ struct dentry *debugfs;
+ struct dentry *q54sj108a2_dir;
+ struct q54sj108a2_data *psu;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+
+ if (client->dev.of_node)
+ chip_id = (enum chips)(unsigned long)of_device_get_match_data(dev);
+ else
+ chip_id = i2c_match_id(q54sj108a2_id, client)->driver_data;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read Manufacturer ID\n");
+ return ret;
+ }
+ if (ret != 5 || strncmp(buf, "DELTA", 5)) {
+ buf[ret] = '\0';
+ dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
+ return -ENODEV;
+ }
+
+ /*
+ * The chips support reading PMBUS_MFR_MODEL.
+ */
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read Manufacturer Model\n");
+ return ret;
+ }
+ if (ret != 14 || strncmp(buf, "Q54SJ108A2", 10)) {
+ buf[ret] = '\0';
+ dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
+ return -ENODEV;
+ }
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read Manufacturer Revision\n");
+ return ret;
+ }
+ if (ret != 4 || buf[0] != 'S') {
+ buf[ret] = '\0';
+ dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf);
+ return -ENODEV;
+ }
+
+ ret = pmbus_do_probe(client, &q54sj108a2_info[chip_id]);
+ if (ret)
+ return ret;
+
+ psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+ if (!psu)
+ return 0;
+
+ psu->client = client;
+
+ debugfs = pmbus_get_debugfs_dir(client);
+
+ q54sj108a2_dir = debugfs_create_dir(client->name, debugfs);
+
+ for (i = 0; i < Q54SJ108A2_DEBUGFS_NUM_ENTRIES; ++i)
+ psu->debugfs_entries[i] = i;
+
+ debugfs_create_file("operation", 0644, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_OPERATION],
+ &q54sj108a2_fops);
+ debugfs_create_file("clear_fault", 0200, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_CLEARFAULT],
+ &q54sj108a2_fops);
+ debugfs_create_file("write_protect", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_WRITEPROTECT],
+ &q54sj108a2_fops);
+ debugfs_create_file("store_default", 0200, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_STOREDEFAULT],
+ &q54sj108a2_fops);
+ debugfs_create_file("vo_ov_response", 0644, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_VOOV_RESPONSE],
+ &q54sj108a2_fops);
+ debugfs_create_file("io_oc_response", 0644, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_IOOC_RESPONSE],
+ &q54sj108a2_fops);
+ debugfs_create_file("pmbus_revision", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_PMBUS_VERSION],
+ &q54sj108a2_fops);
+ debugfs_create_file("mfr_id", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_ID],
+ &q54sj108a2_fops);
+ debugfs_create_file("mfr_model", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_MODEL],
+ &q54sj108a2_fops);
+ debugfs_create_file("mfr_revision", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_REVISION],
+ &q54sj108a2_fops);
+ debugfs_create_file("mfr_location", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_LOCATION],
+ &q54sj108a2_fops);
+ debugfs_create_file("blackbox_erase", 0200, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE],
+ &q54sj108a2_fops);
+ debugfs_create_file("blackbox_read_offset", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET],
+ &q54sj108a2_fops);
+ debugfs_create_file("blackbox_set_offset", 0200, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET],
+ &q54sj108a2_fops);
+ debugfs_create_file("blackbox_read", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_READ],
+ &q54sj108a2_fops);
+ debugfs_create_file("flash_key", 0444, q54sj108a2_dir,
+ &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_FLASH_KEY],
+ &q54sj108a2_fops);
+
+ return 0;
+}
+
+static const struct of_device_id q54sj108a2_of_match[] = {
+ { .compatible = "delta,q54sj108a2", .data = (void *)q54sj108a2 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, q54sj108a2_of_match);
+
+static struct i2c_driver q54sj108a2_driver = {
+ .driver = {
+ .name = "q54sj108a2",
+ .of_match_table = q54sj108a2_of_match,
+ },
+ .probe_new = q54sj108a2_probe,
+ .id_table = q54sj108a2_id,
+};
+
+module_i2c_driver(q54sj108a2_driver);
+
+MODULE_AUTHOR("Xiao.Ma <xiao.mx.ma@deltaww.com>");
+MODULE_DESCRIPTION("PMBus driver for Delta Q54SJ108A2 series modules");
+MODULE_LICENSE("GPL");
OSDN Git Service
