| /* |
| * 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 { adm1275, adm1276 }; |
| |
| #define ADM1275_PEAK_IOUT 0xd0 |
| #define ADM1275_PEAK_VIN 0xd1 |
| #define ADM1275_PEAK_VOUT 0xd2 |
| #define ADM1275_PMON_CONFIG 0xd4 |
| |
| #define ADM1275_VIN_VOUT_SELECT (1 << 6) |
| #define ADM1275_VRANGE (1 << 5) |
| |
| #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) |
| |
| 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) |
| |
| 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_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 != adm1276) { |
| 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 != adm1276) |
| 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; |
| default: |
| ret = -ENODATA; |
| break; |
| } |
| return ret; |
| } |
| |
| static const struct i2c_device_id adm1275_id[] = { |
| { "adm1275", adm1275 }, |
| { "adm1276", adm1276 }, |
| { } |
| }; |
| 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 = kzalloc(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; |
| 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; |
| |
| 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 (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 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; |
| } |
| |
| ret = pmbus_do_probe(client, id, info); |
| if (ret) |
| goto err_mem; |
| return 0; |
| |
| err_mem: |
| kfree(data); |
| return ret; |
| } |
| |
| static int adm1275_remove(struct i2c_client *client) |
| { |
| const struct pmbus_driver_info *info = pmbus_get_driver_info(client); |
| const struct adm1275_data *data = to_adm1275_data(info); |
| |
| pmbus_do_remove(client); |
| kfree(data); |
| return 0; |
| } |
| |
| static struct i2c_driver adm1275_driver = { |
| .driver = { |
| .name = "adm1275", |
| }, |
| .probe = adm1275_probe, |
| .remove = adm1275_remove, |
| .id_table = adm1275_id, |
| }; |
| |
| static int __init adm1275_init(void) |
| { |
| return i2c_add_driver(&adm1275_driver); |
| } |
| |
| static void __exit adm1275_exit(void) |
| { |
| i2c_del_driver(&adm1275_driver); |
| } |
| |
| MODULE_AUTHOR("Guenter Roeck"); |
| MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles"); |
| MODULE_LICENSE("GPL"); |
| module_init(adm1275_init); |
| module_exit(adm1275_exit); |