diff options
Diffstat (limited to 'drivers/hwmon/pmbus/adm1275.c')
| -rw-r--r-- | drivers/hwmon/pmbus/adm1275.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c new file mode 100644 index 0000000..d29f604 --- /dev/null +++ b/drivers/hwmon/pmbus/adm1275.c @@ -0,0 +1,457 @@ +/* + * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller + * and Digital Power Monitor + * + * Copyright (c) 2011 Ericsson AB. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include "pmbus.h" + +enum chips { adm1075, adm1275, adm1276, adm1278 }; + +#define ADM1275_PEAK_IOUT 0xd0 +#define ADM1275_PEAK_VIN 0xd1 +#define ADM1275_PEAK_VOUT 0xd2 +#define ADM1278_PMON_CONTROL 0xd3 +#define ADM1275_PMON_CONFIG 0xd4 + +#define ADM1278_CFG_TSFLT (1 << 15) +#define ADM1278_CFG_SIMULTANEOUS (1 << 14) +#define ADM1278_CFG_PMON_MODE (1 << 4) +#define ADM1278_CFG_TEMP1_EN (1 << 3) +#define ADM1278_CFG_VIN_EN (1 << 2) +#define ADM1278_CFG_VOUT_EN (1 << 1) + +#define ADM1275_VIN_VOUT_SELECT (1 << 6) +#define ADM1275_VRANGE (1 << 5) +#define ADM1075_IRANGE_50 (1 << 4) +#define ADM1075_IRANGE_25 (1 << 3) +#define ADM1075_IRANGE_MASK ((1 << 3) | (1 << 4)) + +#define ADM1275_IOUT_WARN2_LIMIT 0xd7 +#define ADM1275_DEVICE_CONFIG 0xd8 + +#define ADM1275_IOUT_WARN2_SELECT (1 << 4) + +#define ADM1276_PEAK_PIN 0xda + +#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0) + +#define ADM1075_READ_VAUX 0xdd +#define ADM1075_VAUX_OV_WARN_LIMIT 0xde +#define ADM1075_VAUX_UV_WARN_LIMIT 0xdf +#define ADM1075_VAUX_STATUS 0xf6 + +#define ADM1075_VAUX_OV_WARN (1<<7) +#define ADM1075_VAUX_UV_WARN (1<<6) + +struct adm1275_data { + int id; + bool have_oc_fault; + struct pmbus_driver_info info; +}; + +#define to_adm1275_data(x) container_of(x, struct adm1275_data, info) + +#define ADM1278_R_SENSE 500 /* R_sense resistor value in microohms */ + +static int r_sense = ADM1278_R_SENSE; +module_param(r_sense, int, 0644); +MODULE_PARM_DESC(r_sense, "Rsense resistor value in microohms"); + + +static int adm1275_read_word_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + const struct adm1275_data *data = to_adm1275_data(info); + int ret = 0; + + if (page) + return -ENXIO; + + switch (reg) { + case PMBUS_IOUT_UC_FAULT_LIMIT: + if (data->have_oc_fault) { + ret = -ENXIO; + break; + } + ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); + break; + case PMBUS_IOUT_OC_FAULT_LIMIT: + if (!data->have_oc_fault) { + ret = -ENXIO; + break; + } + ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); + break; + case PMBUS_VOUT_OV_WARN_LIMIT: + if (data->id != adm1075) { + ret = -ENODATA; + break; + } + ret = pmbus_read_word_data(client, 0, + ADM1075_VAUX_OV_WARN_LIMIT); + break; + case PMBUS_VOUT_UV_WARN_LIMIT: + if (data->id != adm1075) { + ret = -ENODATA; + break; + } + ret = pmbus_read_word_data(client, 0, + ADM1075_VAUX_UV_WARN_LIMIT); + break; + case PMBUS_READ_VOUT: + if (data->id != adm1075) { + ret = -ENODATA; + break; + } + ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX); + break; + case PMBUS_VIRT_READ_IOUT_MAX: + ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT); + break; + case PMBUS_VIRT_READ_VOUT_MAX: + ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT); + break; + case PMBUS_VIRT_READ_VIN_MAX: + ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN); + break; + case PMBUS_VIRT_READ_PIN_MAX: + if (data->id == adm1275) { + ret = -ENXIO; + break; + } + ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN); + break; + case PMBUS_VIRT_RESET_IOUT_HISTORY: + case PMBUS_VIRT_RESET_VOUT_HISTORY: + case PMBUS_VIRT_RESET_VIN_HISTORY: + break; + case PMBUS_VIRT_RESET_PIN_HISTORY: + if (data->id == adm1275) + ret = -ENXIO; + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static int adm1275_write_word_data(struct i2c_client *client, int page, int reg, + u16 word) +{ + int ret; + + if (page) + return -ENXIO; + + switch (reg) { + case PMBUS_IOUT_UC_FAULT_LIMIT: + case PMBUS_IOUT_OC_FAULT_LIMIT: + ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT, + word); + break; + case PMBUS_VIRT_RESET_IOUT_HISTORY: + ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0); + break; + case PMBUS_VIRT_RESET_VOUT_HISTORY: + ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0); + break; + case PMBUS_VIRT_RESET_VIN_HISTORY: + ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0); + break; + case PMBUS_VIRT_RESET_PIN_HISTORY: + ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0); + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + const struct adm1275_data *data = to_adm1275_data(info); + int mfr_status, ret; + + if (page > 0) + return -ENXIO; + + switch (reg) { + case PMBUS_STATUS_IOUT: + ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT); + if (ret < 0) + break; + mfr_status = pmbus_read_byte_data(client, page, + PMBUS_STATUS_MFR_SPECIFIC); + if (mfr_status < 0) { + ret = mfr_status; + break; + } + if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) { + ret |= data->have_oc_fault ? + PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT; + } + break; + case PMBUS_STATUS_VOUT: + if (data->id != adm1075) { + ret = -ENODATA; + break; + } + ret = 0; + mfr_status = pmbus_read_byte_data(client, 0, + ADM1075_VAUX_STATUS); + if (mfr_status & ADM1075_VAUX_OV_WARN) + ret |= PB_VOLTAGE_OV_WARNING; + if (mfr_status & ADM1075_VAUX_UV_WARN) + ret |= PB_VOLTAGE_UV_WARNING; + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static const struct i2c_device_id adm1275_id[] = { + { "adm1075", adm1075 }, + { "adm1275", adm1275 }, + { "adm1276", adm1276 }, + { "adm1278", adm1278 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adm1275_id); + +static int adm1275_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + int config, device_config; + int ret; + struct pmbus_driver_info *info; + struct adm1275_data *data; + const struct i2c_device_id *mid; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA + | I2C_FUNC_SMBUS_BLOCK_DATA)) + return -ENODEV; + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer); + if (ret < 0) { + dev_err(&client->dev, "Failed to read Manufacturer ID\n"); + return ret; + } + if (ret != 3 || strncmp(block_buffer, "ADI", 3)) { + dev_err(&client->dev, "Unsupported Manufacturer ID\n"); + return -ENODEV; + } + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer); + if (ret < 0) { + dev_err(&client->dev, "Failed to read Manufacturer Model\n"); + return ret; + } + for (mid = adm1275_id; mid->name[0]; mid++) { + if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) + break; + } + if (!mid->name[0]) { + dev_err(&client->dev, "Unsupported device\n"); + return -ENODEV; + } + + if (id->driver_data != mid->driver_data) + dev_notice(&client->dev, + "Device mismatch: Configured %s, detected %s\n", + id->name, mid->name); + + config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG); + if (config < 0) + return config; + + device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG); + if (device_config < 0) + return device_config; + + data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = mid->driver_data; + + info = &data->info; + + info->pages = 1; + info->format[PSC_VOLTAGE_IN] = direct; + info->format[PSC_VOLTAGE_OUT] = direct; + info->format[PSC_CURRENT_OUT] = direct; + if (data->id == adm1278) + info->m[PSC_CURRENT_OUT] = 807 * r_sense / 1000; + else + info->m[PSC_CURRENT_OUT] = 807; + info->b[PSC_CURRENT_OUT] = 20475; + info->R[PSC_CURRENT_OUT] = -1; + info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; + + if (data->id == adm1278) { + /* Configure monitoring */ + ret = i2c_smbus_write_byte_data(client, + ADM1278_PMON_CONTROL, 0); + if (ret < 0) + return ret; + ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG); + ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG, + ADM1278_CFG_PMON_MODE | + ADM1278_CFG_TEMP1_EN | + ADM1278_CFG_VIN_EN | + ADM1278_CFG_VOUT_EN); + if (ret < 0) + return ret; + ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG); + ret = i2c_smbus_write_byte_data(client, ADM1278_PMON_CONTROL, 1); + if (ret < 0) + return ret; + } else { + /* TODO klahey -- there might be adm1278 issues here, too. */ + info->read_word_data = adm1275_read_word_data; + info->read_byte_data = adm1275_read_byte_data; + info->write_word_data = adm1275_write_word_data; + } + + if (data->id == adm1278) { + info->m[PSC_VOLTAGE_IN] = 19599; + info->b[PSC_VOLTAGE_IN] = 0; + info->R[PSC_VOLTAGE_IN] = -2; + info->m[PSC_VOLTAGE_OUT] = 19599; + info->b[PSC_VOLTAGE_OUT] = 0; + info->R[PSC_VOLTAGE_OUT] = -2; + } else if (data->id == adm1075) { + info->m[PSC_VOLTAGE_IN] = 27169; + info->b[PSC_VOLTAGE_IN] = 0; + info->R[PSC_VOLTAGE_IN] = -1; + info->m[PSC_VOLTAGE_OUT] = 27169; + info->b[PSC_VOLTAGE_OUT] = 0; + info->R[PSC_VOLTAGE_OUT] = -1; + } else if (config & ADM1275_VRANGE) { + info->m[PSC_VOLTAGE_IN] = 19199; + info->b[PSC_VOLTAGE_IN] = 0; + info->R[PSC_VOLTAGE_IN] = -2; + info->m[PSC_VOLTAGE_OUT] = 19199; + info->b[PSC_VOLTAGE_OUT] = 0; + info->R[PSC_VOLTAGE_OUT] = -2; + } else { + info->m[PSC_VOLTAGE_IN] = 6720; + info->b[PSC_VOLTAGE_IN] = 0; + info->R[PSC_VOLTAGE_IN] = -1; + info->m[PSC_VOLTAGE_OUT] = 6720; + info->b[PSC_VOLTAGE_OUT] = 0; + info->R[PSC_VOLTAGE_OUT] = -1; + } + + if (device_config & ADM1275_IOUT_WARN2_SELECT) + data->have_oc_fault = true; + + switch (data->id) { + case adm1075: + info->format[PSC_POWER] = direct; + info->b[PSC_POWER] = 0; + info->R[PSC_POWER] = -1; + switch (config & ADM1075_IRANGE_MASK) { + case ADM1075_IRANGE_25: + info->m[PSC_POWER] = 8549; + info->m[PSC_CURRENT_OUT] = 806; + break; + case ADM1075_IRANGE_50: + info->m[PSC_POWER] = 4279; + info->m[PSC_CURRENT_OUT] = 404; + break; + default: + dev_err(&client->dev, "Invalid input current range"); + info->m[PSC_POWER] = 0; + info->m[PSC_CURRENT_OUT] = 0; + break; + } + info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN + | PMBUS_HAVE_STATUS_INPUT; + if (config & ADM1275_VIN_VOUT_SELECT) + info->func[0] |= + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; + break; + case adm1275: + if (config & ADM1275_VIN_VOUT_SELECT) + info->func[0] |= + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; + else + info->func[0] |= + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT; + break; + case adm1276: + info->format[PSC_POWER] = direct; + info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN + | PMBUS_HAVE_STATUS_INPUT; + if (config & ADM1275_VIN_VOUT_SELECT) + info->func[0] |= + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; + if (config & ADM1275_VRANGE) { + info->m[PSC_POWER] = 6043; + info->b[PSC_POWER] = 0; + info->R[PSC_POWER] = -2; + } else { + info->m[PSC_POWER] = 2115; + info->b[PSC_POWER] = 0; + info->R[PSC_POWER] = -1; + } + break; + case adm1278: + info->format[PSC_POWER] = direct; + info->format[PSC_TEMPERATURE] = direct; + info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT + | PMBUS_HAVE_STATUS_INPUT + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; + info->m[PSC_POWER] = 6123 * r_sense / 1000; + info->b[PSC_POWER] = 0; + info->R[PSC_POWER] = -2; + info->m[PSC_TEMPERATURE] = 42; + info->b[PSC_TEMPERATURE] = 31880; + info->R[PSC_TEMPERATURE] = -1; + break; + } + + return pmbus_do_probe(client, id, info); +} + +static struct i2c_driver adm1275_driver = { + .driver = { + .name = "adm1275", + }, + .probe = adm1275_probe, + .remove = pmbus_do_remove, + .id_table = adm1275_id, +}; + +module_i2c_driver(adm1275_driver); + +MODULE_AUTHOR("Guenter Roeck"); +MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles"); +MODULE_LICENSE("GPL"); |
