--- /dev/null
+Kernel driver aps-379
+=====================
+
+Supported chips:
+
+ * Sony APS-379
+
+ Prefix: 'aps-379'
+
+ Addresses scanned: -
+
+ Authors:
+ - Chris Packham
+
+Description
+-----------
+
+This driver implements support for the PMBus monitor on the Sony APS-379
+modular power supply. The APS-379 deviates from the PMBus standard for the
+READ_VOUT command by using the linear11 format instead of linear16.
+
+The known supported PMBus commands are:
+
+=== ============================= ========= ======= =====
+Cmd Function Protocol Scaling Bytes
+=== ============================= ========= ======= =====
+01 On / Off Command (OPERATION) Byte R/W -- 1
+10 WRITE_PROTECT Byte R/W -- 1
+3B FAN_COMMAND_1 Word R/W -- 2
+46 Current Limit (in percent) Word R/W 2^0 2
+47 Current Limit Fault Response Byte R/W -- 1
+79 Alarm Data Bits (STATUS_WORD) Word Rd -- 2
+8B Output Voltage (READ_VOUT) Word Rd 2^-4 2
+8C Output Current (READ_IOUT) Word Rd 2^-2 2
+8D Power Supply Ambient Temp Word Rd 2^0 2
+90 READ_FAN_SPEED_1 Word Rd 2^6 2
+91 READ_FAN_SPEED_2 Word Rd 2^6 2
+96 Output Wattage (READ_POUT) Word Rd 2^1 2
+97 Input Wattage (READ_PIN) Word Rd 2^1 2
+9A Unit Model Number (MFR_MODEL) Block R/W -- 10
+9B Unit Revision Number Block R/W -- 10
+9E Unit Serial Number Block R/W -- 8
+99 Unit Manufacturer ID (MFR_ID) Block R/W -- 8
+D0 Unit Run Time Information Block Rd -- 4
+D5 Firmware Version Rd cust -- 8
+B0 User Data 1 (USER_DATA_00) Block R/W -- 4
+B1 User Data 2 (USER_DATA_01) Block R/W -- 4
+B2 User Data 3 (USER_DATA_02) Block R/W -- 4
+B3 User Data 4 (USER_DATA_03) Block R/W -- 4
+B4 User Data 5 (USER_DATA_04) Block R/W -- 4
+B5 User Data 6 (USER_DATA_05) Block R/W -- 4
+B6 User Data 7 (USER_DATA_06) Block R/W -- 4
+B7 User Data 8 (USER_DATA_07) Block R/W -- 4
+F0 Calibration command Byte R/W -- 1
+F1 Calibration data Word Wr 2^9 2
+F2 Unlock Calibration Byte Wr -- 1
+=== ============================= ========= ======= =====
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for Sony APS-379 Power Supplies
+ *
+ * Copyright 2026 Allied Telesis Labs
+ */
+
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+/*
+ * The VOUT format used by the chip is linear11, not linear16. Provide a hard
+ * coded VOUT_MODE that says VOUT is in linear mode with a fixed exponent of
+ * 2^-4.
+ */
+#define APS_379_VOUT_MODE ((u8)(-4 & 0x1f))
+
+static int aps_379_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ switch (reg) {
+ case PMBUS_VOUT_MODE:
+ return APS_379_VOUT_MODE;
+ default:
+ return -ENODATA;
+ }
+}
+
+/*
+ * The APS-379 uses linear11 format instead of linear16. We've reported the exponent
+ * via the PMBUS_VOUT_MODE so we just return the mantissa here.
+ */
+static int aps_379_read_vout(struct i2c_client *client)
+{
+ int ret;
+
+ ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_READ_VOUT);
+ if (ret < 0)
+ return ret;
+
+ return clamp_val(sign_extend32(ret & 0x7ff, 10), 0, 0x3ff);
+}
+
+static int aps_379_read_word_data(struct i2c_client *client, int page, int phase, int reg)
+{
+ switch (reg) {
+ case PMBUS_VOUT_UV_WARN_LIMIT:
+ case PMBUS_VOUT_OV_WARN_LIMIT:
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ case PMBUS_IOUT_UC_FAULT_LIMIT:
+ case PMBUS_UT_WARN_LIMIT:
+ case PMBUS_UT_FAULT_LIMIT:
+ case PMBUS_OT_WARN_LIMIT:
+ case PMBUS_OT_FAULT_LIMIT:
+ case PMBUS_PIN_OP_WARN_LIMIT:
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ case PMBUS_MFR_IIN_MAX:
+ case PMBUS_MFR_PIN_MAX:
+ case PMBUS_MFR_VOUT_MIN:
+ case PMBUS_MFR_VOUT_MAX:
+ case PMBUS_MFR_IOUT_MAX:
+ case PMBUS_MFR_POUT_MAX:
+ case PMBUS_MFR_MAX_TEMP_1:
+ /* These commands return data but it is invalid/un-documented */
+ return -ENXIO;
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ /*
+ * The standard requires this to be a value in Amps but it's
+ * actually a percentage of the rated output (123A for
+ * 110-240Vac, 110A for 90-100Vac) which we don't know. Ignore
+ * it rather than guessing.
+ */
+ return -ENXIO;
+ case PMBUS_READ_VOUT:
+ return aps_379_read_vout(client);
+ default:
+ return -ENODATA;
+ }
+}
+
+static struct pmbus_driver_info aps_379_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_OUT] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_POWER] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_FAN] = linear,
+ .func[0] = PMBUS_HAVE_VOUT |
+ PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+ PMBUS_HAVE_TEMP |
+ PMBUS_HAVE_FAN12,
+ .read_byte_data = aps_379_read_byte_data,
+ .read_word_data = aps_379_read_word_data,
+};
+
+static const struct i2c_device_id aps_379_id[] = {
+ { "aps-379", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, aps_379_id);
+
+static int aps_379_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = { 0 };
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_WORD_DATA
+ | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+ return -ENODEV;
+
+ 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 (strncasecmp(buf, aps_379_id[0].name, strlen(aps_379_id[0].name)) != 0) {
+ buf[ret] = '\0';
+ dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
+ return -ENODEV;
+ }
+
+ return pmbus_do_probe(client, &aps_379_info);
+}
+
+static const struct of_device_id __maybe_unused aps_379_of_match[] = {
+ { .compatible = "sony,aps-379" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, aps_379_of_match);
+
+static struct i2c_driver aps_379_driver = {
+ .driver = {
+ .name = "aps-379",
+ .of_match_table = of_match_ptr(aps_379_of_match),
+ },
+ .probe = aps_379_probe,
+ .id_table = aps_379_id,
+};
+
+module_i2c_driver(aps_379_driver);
+
+MODULE_AUTHOR("Chris Packham");
+MODULE_DESCRIPTION("PMBus driver for Sony APS-379");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
projects / thirdparty / kernel / linux.git / commitdiff
