/* * Hardware monitoring driver for LM25066 / LM5064 / LM5066 * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #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 { lm25066, lm5064, lm5066 }; #define LM25066_READ_VAUX 0xd0 #define LM25066_MFR_READ_IIN 0xd1 #define LM25066_MFR_READ_PIN 0xd2 #define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3 #define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4 #define LM25066_READ_PIN_PEAK 0xd5 #define LM25066_CLEAR_PIN_PEAK 0xd6 #define LM25066_DEVICE_SETUP 0xd9 #define LM25066_READ_AVG_VIN 0xdc #define LM25066_READ_AVG_VOUT 0xdd #define LM25066_READ_AVG_IIN 0xde #define LM25066_READ_AVG_PIN 0xdf #define LM25066_DEV_SETUP_CL (1 << 4) /* Current limit */ struct lm25066_data { int id; struct pmbus_driver_info info; }; #define to_lm25066_data(x) container_of(x, struct lm25066_data, info) static int lm25066_read_word_data(struct i2c_client *client, int page, int reg) { const struct pmbus_driver_info *info = pmbus_get_driver_info(client); const struct lm25066_data *data = to_lm25066_data(info); int ret; if (page > 1) return -ENXIO; /* Map READ_VAUX into READ_VOUT register on page 1 */ if (page == 1) { switch (reg) { case PMBUS_READ_VOUT: ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX); if (ret < 0) break; /* Adjust returned value to match VOUT coefficients */ switch (data->id) { case lm25066: /* VOUT: 4.54 mV VAUX: 283.2 uV LSB */ ret = DIV_ROUND_CLOSEST(ret * 2832, 45400); break; case lm5064: /* VOUT: 4.53 mV VAUX: 700 uV LSB */ ret = DIV_ROUND_CLOSEST(ret * 70, 453); break; case lm5066: /* VOUT: 2.18 mV VAUX: 725 uV LSB */ ret = DIV_ROUND_CLOSEST(ret * 725, 2180); break; } break; default: /* No other valid registers on page 1 */ ret = -ENXIO; break; } goto done; } switch (reg) { case PMBUS_READ_IIN: ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN); break; case PMBUS_READ_PIN: ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN); break; case PMBUS_IIN_OC_WARN_LIMIT: ret = pmbus_read_word_data(client, 0, LM25066_MFR_IIN_OC_WARN_LIMIT); break; case PMBUS_PIN_OP_WARN_LIMIT: ret = pmbus_read_word_data(client, 0, LM25066_MFR_PIN_OP_WARN_LIMIT); break; case PMBUS_VIRT_READ_VIN_AVG: ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN); break; case PMBUS_VIRT_READ_VOUT_AVG: ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT); break; case PMBUS_VIRT_READ_IIN_AVG: ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN); break; case PMBUS_VIRT_READ_PIN_AVG: ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN); break; case PMBUS_VIRT_READ_PIN_MAX: ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK); break; case PMBUS_VIRT_RESET_PIN_HISTORY: ret = 0; break; default: ret = -ENODATA; break; } done: return ret; } static int lm25066_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { int ret; if (page > 1) return -ENXIO; switch (reg) { case PMBUS_IIN_OC_WARN_LIMIT: ret = pmbus_write_word_data(client, 0, LM25066_MFR_IIN_OC_WARN_LIMIT, word); break; case PMBUS_PIN_OP_WARN_LIMIT: ret = pmbus_write_word_data(client, 0, LM25066_MFR_PIN_OP_WARN_LIMIT, word); break; case PMBUS_VIRT_RESET_PIN_HISTORY: ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK); break; default: ret = -ENODATA; break; } return ret; } static int lm25066_write_byte(struct i2c_client *client, int page, u8 value) { if (page > 1) return -ENXIO; if (page <= 0) return pmbus_write_byte(client, page, value); return 0; } static int lm25066_probe(struct i2c_client *client, const struct i2c_device_id *id) { int config; int ret; struct lm25066_data *data; struct pmbus_driver_info *info; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) return -ENODEV; data = kzalloc(sizeof(struct lm25066_data), GFP_KERNEL); if (!data) return -ENOMEM; config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP); if (config < 0) { ret = config; goto err_mem; } data->id = id->driver_data; info = &data->info; info->pages = 2; info->format[PSC_VOLTAGE_IN] = direct; info->format[PSC_VOLTAGE_OUT] = direct; info->format[PSC_CURRENT_IN] = direct; info->format[PSC_TEMPERATURE] = direct; info->format[PSC_POWER] = direct; info->m[PSC_TEMPERATURE] = 16; info->b[PSC_TEMPERATURE] = 0; info->R[PSC_TEMPERATURE] = 0; info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; info->func[1] = PMBUS_HAVE_VOUT; info->read_word_data = lm25066_read_word_data; info->write_word_data = lm25066_write_word_data; info->write_byte = lm25066_write_byte; switch (id->driver_data) { case lm25066: info->m[PSC_VOLTAGE_IN] = 22070; info->b[PSC_VOLTAGE_IN] = 0; info->R[PSC_VOLTAGE_IN] = -2; info->m[PSC_VOLTAGE_OUT] = 22070; info->b[PSC_VOLTAGE_OUT] = 0; info->R[PSC_VOLTAGE_OUT] = -2; if (config & LM25066_DEV_SETUP_CL) { info->m[PSC_CURRENT_IN] = 6852; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 369; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -2; } else { info->m[PSC_CURRENT_IN] = 13661; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 736; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -2; } break; case lm5064: info->m[PSC_VOLTAGE_IN] = 22075; info->b[PSC_VOLTAGE_IN] = 0; info->R[PSC_VOLTAGE_IN] = -2; info->m[PSC_VOLTAGE_OUT] = 22075; info->b[PSC_VOLTAGE_OUT] = 0; info->R[PSC_VOLTAGE_OUT] = -2; if (config & LM25066_DEV_SETUP_CL) { info->m[PSC_CURRENT_IN] = 6713; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 3619; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -3; } else { info->m[PSC_CURRENT_IN] = 13426; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 7238; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -3; } break; case lm5066: info->m[PSC_VOLTAGE_IN] = 4587; info->b[PSC_VOLTAGE_IN] = 0; info->R[PSC_VOLTAGE_IN] = -2; info->m[PSC_VOLTAGE_OUT] = 4587; info->b[PSC_VOLTAGE_OUT] = 0; info->R[PSC_VOLTAGE_OUT] = -2; if (config & LM25066_DEV_SETUP_CL) { info->m[PSC_CURRENT_IN] = 10753; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 1204; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -3; } else { info->m[PSC_CURRENT_IN] = 5405; info->b[PSC_CURRENT_IN] = 0; info->R[PSC_CURRENT_IN] = -2; info->m[PSC_POWER] = 605; info->b[PSC_POWER] = 0; info->R[PSC_POWER] = -3; } break; default: ret = -ENODEV; goto err_mem; } ret = pmbus_do_probe(client, id, info); if (ret) goto err_mem; return 0; err_mem: kfree(data); return ret; } static int lm25066_remove(struct i2c_client *client) { const struct pmbus_driver_info *info = pmbus_get_driver_info(client); const struct lm25066_data *data = to_lm25066_data(info); pmbus_do_remove(client); kfree(data); return 0; } static const struct i2c_device_id lm25066_id[] = { {"lm25066", lm25066}, {"lm5064", lm5064}, {"lm5066", lm5066}, { } }; MODULE_DEVICE_TABLE(i2c, lm25066_id); /* This is the driver that will be inserted */ static struct i2c_driver lm25066_driver = { .driver = { .name = "lm25066", }, .probe = lm25066_probe, .remove = lm25066_remove, .id_table = lm25066_id, }; static int __init lm25066_init(void) { return i2c_add_driver(&lm25066_driver); } static void __exit lm25066_exit(void) { i2c_del_driver(&lm25066_driver); } MODULE_AUTHOR("Guenter Roeck"); MODULE_DESCRIPTION("PMBus driver for LM25066/LM5064/LM5066"); MODULE_LICENSE("GPL"); module_init(lm25066_init); module_exit(lm25066_exit);