2021-02-18 14:52:49 +03:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for the STPDDC60 controller
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*
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* Copyright (c) 2021 Flextronics International Sweden AB.
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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/i2c.h>
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#include <linux/pmbus.h>
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#include "pmbus.h"
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#define STPDDC60_MFR_READ_VOUT 0xd2
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#define STPDDC60_MFR_OV_LIMIT_OFFSET 0xe5
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#define STPDDC60_MFR_UV_LIMIT_OFFSET 0xe6
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static const struct i2c_device_id stpddc60_id[] = {
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{"stpddc60", 0},
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{"bmr481", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, stpddc60_id);
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static struct pmbus_driver_info stpddc60_info = {
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.pages = 1,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_POUT,
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};
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/*
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* Calculate the closest absolute offset between commanded vout value
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* and limit value in steps of 50mv in the range 0 (50mv) to 7 (400mv).
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* Return 0 if the upper limit is lower than vout or if the lower limit
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* is higher than vout.
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*/
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static u8 stpddc60_get_offset(int vout, u16 limit, bool over)
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{
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int offset;
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long v, l;
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v = 250 + (vout - 1) * 5; /* Convert VID to mv */
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l = (limit * 1000L) >> 8; /* Convert LINEAR to mv */
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if (over == (l < v))
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return 0;
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offset = DIV_ROUND_CLOSEST(abs(l - v), 50);
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if (offset > 0)
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offset--;
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return clamp_val(offset, 0, 7);
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}
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/*
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* Adjust the linear format word to use the given fixed exponent.
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*/
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static u16 stpddc60_adjust_linear(u16 word, s16 fixed)
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{
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s16 e, m, d;
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e = ((s16)word) >> 11;
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m = ((s16)((word & 0x7ff) << 5)) >> 5;
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d = e - fixed;
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if (d >= 0)
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m <<= d;
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else
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m >>= -d;
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return clamp_val(m, 0, 0x3ff) | ((fixed << 11) & 0xf800);
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}
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/*
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* The VOUT_COMMAND register uses the VID format but the vout alarm limit
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* registers use the LINEAR format so we override VOUT_MODE here to force
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* LINEAR format for all registers.
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*/
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static int stpddc60_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret;
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if (page > 0)
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return -ENXIO;
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switch (reg) {
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case PMBUS_VOUT_MODE:
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ret = 0x18;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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/*
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* The vout related registers return values in LINEAR11 format when LINEAR16
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* is expected. Clear the top 5 bits to set the exponent part to zero to
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* convert the value to LINEAR16 format.
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*/
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static int stpddc60_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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int ret;
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if (page > 0)
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return -ENXIO;
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switch (reg) {
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case PMBUS_READ_VOUT:
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ret = pmbus_read_word_data(client, page, phase,
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STPDDC60_MFR_READ_VOUT);
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if (ret < 0)
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return ret;
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ret &= 0x7ff;
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break;
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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ret = pmbus_read_word_data(client, page, phase, reg);
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if (ret < 0)
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return ret;
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ret &= 0x7ff;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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/*
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* The vout under- and over-voltage limits are set as an offset relative to
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* the commanded vout voltage. The vin, iout, pout and temp limits must use
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* the same fixed exponent the chip uses to encode the data when read.
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*/
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static int stpddc60_write_word_data(struct i2c_client *client, int page,
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int reg, u16 word)
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{
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int ret;
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u8 offset;
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if (page > 0)
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return -ENXIO;
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switch (reg) {
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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ret = pmbus_read_word_data(client, page, 0xff,
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PMBUS_VOUT_COMMAND);
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if (ret < 0)
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return ret;
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offset = stpddc60_get_offset(ret, word, true);
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ret = pmbus_write_byte_data(client, page,
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STPDDC60_MFR_OV_LIMIT_OFFSET,
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offset);
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break;
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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ret = pmbus_read_word_data(client, page, 0xff,
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PMBUS_VOUT_COMMAND);
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if (ret < 0)
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return ret;
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offset = stpddc60_get_offset(ret, word, false);
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ret = pmbus_write_byte_data(client, page,
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STPDDC60_MFR_UV_LIMIT_OFFSET,
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offset);
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break;
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case PMBUS_VIN_OV_FAULT_LIMIT:
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case PMBUS_VIN_UV_FAULT_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_POUT_OP_FAULT_LIMIT:
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ret = pmbus_read_word_data(client, page, 0xff, reg);
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if (ret < 0)
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return ret;
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word = stpddc60_adjust_linear(word, ret >> 11);
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ret = pmbus_write_word_data(client, page, reg, word);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int stpddc60_probe(struct i2c_client *client)
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{
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int status;
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u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
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const struct i2c_device_id *mid;
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struct pmbus_driver_info *info = &stpddc60_info;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA
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| I2C_FUNC_SMBUS_BLOCK_DATA))
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return -ENODEV;
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status = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, device_id);
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if (status < 0) {
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dev_err(&client->dev, "Failed to read Manufacturer Model\n");
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return status;
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}
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for (mid = stpddc60_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
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break;
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}
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if (!mid->name[0]) {
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dev_err(&client->dev, "Unsupported device\n");
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return -ENODEV;
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}
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info->read_byte_data = stpddc60_read_byte_data;
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info->read_word_data = stpddc60_read_word_data;
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info->write_word_data = stpddc60_write_word_data;
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status = pmbus_do_probe(client, info);
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if (status < 0)
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return status;
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pmbus_set_update(client, PMBUS_VOUT_OV_FAULT_LIMIT, true);
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pmbus_set_update(client, PMBUS_VOUT_UV_FAULT_LIMIT, true);
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return 0;
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}
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static struct i2c_driver stpddc60_driver = {
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.driver = {
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.name = "stpddc60",
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},
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.probe_new = stpddc60_probe,
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.id_table = stpddc60_id,
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};
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module_i2c_driver(stpddc60_driver);
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MODULE_AUTHOR("Erik Rosen <erik.rosen@metormote.com>");
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MODULE_DESCRIPTION("PMBus driver for ST STPDDC60");
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MODULE_LICENSE("GPL");
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2021-04-20 09:07:07 +03:00
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MODULE_IMPORT_NS(PMBUS);
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