From ddfb41ca2a33c9f5053126324597510974724a1f Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sun, 11 Sep 2011 20:31:09 -0700 Subject: hwmon: (pmbus/ltc2978) Add support for LTC3880 to LTC2978 driver The LTC3880 PMBus command set is comparable to LTC2978. Add support for it to the LTC2978 driver. Signed-off-by: Guenter Roeck Reviewed-by: Robert Coulson diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978 index 499129e..c365f9b 100644 --- a/Documentation/hwmon/ltc2978 +++ b/Documentation/hwmon/ltc2978 @@ -6,6 +6,10 @@ Supported chips: Prefix: 'ltc2978' Addresses scanned: - Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf + * Linear Technology LTC3880 + Prefix: 'ltc3880' + Addresses scanned: - + Datasheet: http://cds.linear.com/docs/Datasheet/3880f.pdf Author: Guenter Roeck @@ -14,7 +18,8 @@ Description ----------- The LTC2978 is an octal power supply monitor, supervisor, sequencer and -margin controller. +margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous +step-down switching regulator controller. Usage Notes @@ -43,12 +48,12 @@ in1_min_alarm Input voltage low alarm. in1_max_alarm Input voltage high alarm. in1_lcrit_alarm Input voltage critical low alarm. in1_crit_alarm Input voltage critical high alarm. -in1_lowest Lowest input voltage. +in1_lowest Lowest input voltage. LTC2978 only. in1_highest Highest input voltage. in1_reset_history Reset history. Writing into this attribute will reset history for all attributes. -in[2-9]_label "vout[1-8]". +in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only. in[2-9]_input Measured output voltage. in[2-9]_min Minimum output voltage. in[2-9]_max Maximum output voltage. @@ -58,21 +63,41 @@ in[2-9]_min_alarm Output voltage low alarm. in[2-9]_max_alarm Output voltage high alarm. in[2-9]_lcrit_alarm Output voltage critical low alarm. in[2-9]_crit_alarm Output voltage critical high alarm. -in[2-9]_lowest Lowest output voltage. +in[2-9]_lowest Lowest output voltage. LTC2978 only. in[2-9]_highest Lowest output voltage. in[2-9]_reset_history Reset history. Writing into this attribute will reset history for all attributes. -temp1_input Measured temperature. -temp1_min Mimimum temperature. -temp1_max Maximum temperature. -temp1_lcrit Critical low temperature. -temp1_crit Critical high temperature. -temp1_min_alarm Chip temperature low alarm. -temp1_max_alarm Chip temperature high alarm. -temp1_lcrit_alarm Chip temperature critical low alarm. -temp1_crit_alarm Chip temperature critical high alarm. -temp1_lowest Lowest measured temperature. -temp1_highest Highest measured temperature. -temp1_reset_history Reset history. Writing into this attribute will reset +temp[1-3]_input Measured temperature. + On LTC2978, only one temperature measurement is + supported and reflects the internal temperature. + On LTC3880, temp1 and temp2 report external + temperatures, and temp3 reports the internal + temperature. +temp[1-3]_min Mimimum temperature. +temp[1-3]_max Maximum temperature. +temp[1-3]_lcrit Critical low temperature. +temp[1-3]_crit Critical high temperature. +temp[1-3]_min_alarm Chip temperature low alarm. +temp[1-3]_max_alarm Chip temperature high alarm. +temp[1-3]_lcrit_alarm Chip temperature critical low alarm. +temp[1-3]_crit_alarm Chip temperature critical high alarm. +temp[1-3]_lowest Lowest measured temperature. LTC2978 only. +temp[1-3]_highest Highest measured temperature. +temp[1-3]_reset_history Reset history. Writing into this attribute will reset history for all attributes. + +power[1-2]_label "pout[1-2]". LTC3880 only. +power[1-2]_input Measured power. + +curr1_label "iin". LTC3880 only. +curr1_input Measured input current. +curr1_max Maximum input current. +curr1_max_alarm Input current high alarm. + +curr[2-3]_label "iout[1-2]". LTC3880 only. +curr[2-3]_input Measured input current. +curr[2-3]_max Maximum input current. +curr[2-3]_crit Critical input current. +curr[2-3]_max_alarm Input current high alarm. +curr[2-3]_crit_alarm Input current critical high alarm. diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index c4dcdca..4b26f51 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -47,11 +47,11 @@ config SENSORS_LM25066 be called lm25066. config SENSORS_LTC2978 - tristate "Linear Technologies LTC2978" + tristate "Linear Technologies LTC2978 and LTC3880" default n help If you say yes here you get hardware monitoring support for Linear - Technology LTC2978. + Technology LTC2978 and LTC3880. This driver can also be built as a module. If so, the module will be called ltc2978. diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c index 02b2e49..820fff4 100644 --- a/drivers/hwmon/pmbus/ltc2978.c +++ b/drivers/hwmon/pmbus/ltc2978.c @@ -1,5 +1,5 @@ /* - * Hardware monitoring driver for LTC2978 + * Hardware monitoring driver for LTC2978 and LTC3880 * * Copyright (c) 2011 Ericsson AB. * @@ -26,19 +26,28 @@ #include #include "pmbus.h" -enum chips { ltc2978 }; +enum chips { ltc2978, ltc3880 }; +/* LTC2978 and LTC3880 */ #define LTC2978_MFR_VOUT_PEAK 0xdd #define LTC2978_MFR_VIN_PEAK 0xde #define LTC2978_MFR_TEMPERATURE_PEAK 0xdf #define LTC2978_MFR_SPECIAL_ID 0xe7 +/* LTC2978 only */ #define LTC2978_MFR_VOUT_MIN 0xfb #define LTC2978_MFR_VIN_MIN 0xfc #define LTC2978_MFR_TEMPERATURE_MIN 0xfd +/* LTC3880 only */ +#define LTC3880_MFR_IOUT_PEAK 0xd7 +#define LTC3880_MFR_CLEAR_PEAKS 0xe3 +#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4 + #define LTC2978_ID_REV1 0x0121 #define LTC2978_ID_REV2 0x0122 +#define LTC3880_ID 0x4000 +#define LTC3880_ID_MASK 0xff00 /* * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which @@ -52,6 +61,8 @@ struct ltc2978_data { int vin_min, vin_max; int temp_min, temp_max; int vout_min[8], vout_max[8]; + int iout_max[2]; + int temp2_max[2]; struct pmbus_driver_info info; }; @@ -70,7 +81,8 @@ static inline int lin11_to_val(int data) return (e < 0 ? m >> -e : m << e); } -static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) +static int ltc2978_read_word_data_common(struct i2c_client *client, int page, + int reg) { const struct pmbus_driver_info *info = pmbus_get_driver_info(client); struct ltc2978_data *data = to_ltc2978_data(info); @@ -106,6 +118,25 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) ret = data->temp_max; } break; + case PMBUS_VIRT_RESET_VOUT_HISTORY: + case PMBUS_VIRT_RESET_VIN_HISTORY: + case PMBUS_VIRT_RESET_TEMP_HISTORY: + ret = 0; + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct ltc2978_data *data = to_ltc2978_data(info); + int ret; + + switch (reg) { case PMBUS_VIRT_READ_VIN_MIN: ret = pmbus_read_word_data(client, page, LTC2978_MFR_VIN_MIN); if (ret >= 0) { @@ -140,18 +171,74 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) ret = data->temp_min; } break; - case PMBUS_VIRT_RESET_VOUT_HISTORY: - case PMBUS_VIRT_RESET_VIN_HISTORY: - case PMBUS_VIRT_RESET_TEMP_HISTORY: + case PMBUS_VIRT_READ_IOUT_MAX: + case PMBUS_VIRT_RESET_IOUT_HISTORY: + case PMBUS_VIRT_READ_TEMP2_MAX: + case PMBUS_VIRT_RESET_TEMP2_HISTORY: + ret = -ENXIO; + break; + default: + ret = ltc2978_read_word_data_common(client, page, reg); + break; + } + return ret; +} + +static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct ltc2978_data *data = to_ltc2978_data(info); + int ret; + + switch (reg) { + case PMBUS_VIRT_READ_IOUT_MAX: + ret = pmbus_read_word_data(client, page, LTC3880_MFR_IOUT_PEAK); + if (ret >= 0) { + if (lin11_to_val(ret) + > lin11_to_val(data->iout_max[page])) + data->iout_max[page] = ret; + ret = data->iout_max[page]; + } + break; + case PMBUS_VIRT_READ_TEMP2_MAX: + ret = pmbus_read_word_data(client, page, + LTC3880_MFR_TEMPERATURE2_PEAK); + if (ret >= 0) { + if (lin11_to_val(ret) + > lin11_to_val(data->temp2_max[page])) + data->temp2_max[page] = ret; + ret = data->temp2_max[page]; + } + break; + case PMBUS_VIRT_READ_VIN_MIN: + case PMBUS_VIRT_READ_VOUT_MIN: + case PMBUS_VIRT_READ_TEMP_MIN: + ret = -ENXIO; + break; + case PMBUS_VIRT_RESET_IOUT_HISTORY: + case PMBUS_VIRT_RESET_TEMP2_HISTORY: ret = 0; break; default: - ret = -ENODATA; + ret = ltc2978_read_word_data_common(client, page, reg); break; } return ret; } +static int ltc2978_clear_peaks(struct i2c_client *client, int page, + enum chips id) +{ + int ret; + + if (id == ltc2978) + ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); + else + ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS); + + return ret; +} + static int ltc2978_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { @@ -160,20 +247,28 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, int ret; switch (reg) { + case PMBUS_VIRT_RESET_IOUT_HISTORY: + data->iout_max[page] = 0x7fff; + ret = ltc2978_clear_peaks(client, page, data->id); + break; + case PMBUS_VIRT_RESET_TEMP2_HISTORY: + data->temp2_max[page] = 0x7fff; + ret = ltc2978_clear_peaks(client, page, data->id); + break; case PMBUS_VIRT_RESET_VOUT_HISTORY: data->vout_min[page] = 0xffff; data->vout_max[page] = 0; - ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); + ret = ltc2978_clear_peaks(client, page, data->id); break; case PMBUS_VIRT_RESET_VIN_HISTORY: data->vin_min = 0x7bff; data->vin_max = 0; - ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); + ret = ltc2978_clear_peaks(client, page, data->id); break; case PMBUS_VIRT_RESET_TEMP_HISTORY: data->temp_min = 0x7bff; data->temp_max = 0x7fff; - ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); + ret = ltc2978_clear_peaks(client, page, data->id); break; default: ret = -ENODATA; @@ -184,6 +279,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, static const struct i2c_device_id ltc2978_id[] = { {"ltc2978", ltc2978}, + {"ltc3880", ltc3880}, {} }; MODULE_DEVICE_TABLE(i2c, ltc2978_id); @@ -211,6 +307,8 @@ static int ltc2978_probe(struct i2c_client *client, if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) { data->id = ltc2978; + } else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) { + data->id = ltc3880; } else { dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id); ret = -ENODEV; @@ -223,7 +321,6 @@ static int ltc2978_probe(struct i2c_client *client, ltc2978_id[data->id].name); info = &data->info; - info->read_word_data = ltc2978_read_word_data; info->write_word_data = ltc2978_write_word_data; data->vout_min[0] = 0xffff; @@ -233,6 +330,7 @@ static int ltc2978_probe(struct i2c_client *client, switch (id->driver_data) { case ltc2978: + info->read_word_data = ltc2978_read_word_data; info->pages = 8; info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT @@ -243,6 +341,21 @@ static int ltc2978_probe(struct i2c_client *client, data->vout_min[i] = 0xffff; } break; + case ltc3880: + info->read_word_data = ltc3880_read_word_data; + info->pages = 2; + info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN + | PMBUS_HAVE_STATUS_INPUT + | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; + info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_POUT + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; + data->vout_min[1] = 0xffff; + break; default: ret = -ENODEV; goto err_mem; @@ -289,7 +402,7 @@ static void __exit ltc2978_exit(void) } MODULE_AUTHOR("Guenter Roeck"); -MODULE_DESCRIPTION("PMBus driver for LTC2978"); +MODULE_DESCRIPTION("PMBus driver for LTC2978 and LTC3880"); MODULE_LICENSE("GPL"); module_init(ltc2978_init); module_exit(ltc2978_exit); -- cgit v0.10.2