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249 lines
5.8 KiB
249 lines
5.8 KiB
// 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 <[email protected]>"); |
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MODULE_DESCRIPTION("PMBus driver for ST STPDDC60"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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