diff options
Diffstat (limited to 'drivers/hwmon/pmbus/ltc2978.c')
-rw-r--r-- | drivers/hwmon/pmbus/ltc2978.c | 170 |
1 files changed, 142 insertions, 28 deletions
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c index 6d61307..586a89e 100644 --- a/drivers/hwmon/pmbus/ltc2978.c +++ b/drivers/hwmon/pmbus/ltc2978.c @@ -1,7 +1,8 @@ /* - * Hardware monitoring driver for LTC2978 and LTC3880 + * Hardware monitoring driver for LTC2974, LTC2978, LTC3880, and LTC3883 * * Copyright (c) 2011 Ericsson AB. + * Copyright (c) 2013 Guenter Roeck * * 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 @@ -26,28 +27,43 @@ #include <linux/i2c.h> #include "pmbus.h" -enum chips { ltc2978, ltc3880 }; +enum chips { ltc2974, ltc2978, ltc3880, ltc3883 }; -/* LTC2978 and LTC3880 */ +/* Common for all chips */ #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 */ +/* LTC2974 and LTC2978 */ #define LTC2978_MFR_VOUT_MIN 0xfb #define LTC2978_MFR_VIN_MIN 0xfc #define LTC2978_MFR_TEMPERATURE_MIN 0xfd -/* LTC3880 only */ +/* LTC2974 only */ +#define LTC2974_MFR_IOUT_PEAK 0xd7 +#define LTC2974_MFR_IOUT_MIN 0xd8 + +/* LTC3880 and LTC3883 */ #define LTC3880_MFR_IOUT_PEAK 0xd7 #define LTC3880_MFR_CLEAR_PEAKS 0xe3 #define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4 +/* LTC3883 only */ +#define LTC3883_MFR_IIN_PEAK 0xe1 + +#define LTC2974_ID 0x0212 #define LTC2978_ID_REV1 0x0121 #define LTC2978_ID_REV2 0x0122 #define LTC3880_ID 0x4000 #define LTC3880_ID_MASK 0xff00 +#define LTC3883_ID 0x4300 +#define LTC3883_ID_MASK 0xff00 + +#define LTC2974_NUM_PAGES 4 +#define LTC2978_NUM_PAGES 8 +#define LTC3880_NUM_PAGES 2 +#define LTC3883_NUM_PAGES 1 /* * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which @@ -56,13 +72,15 @@ enum chips { ltc2978, ltc3880 }; * internal cache of measured peak data, which is only cleared if an explicit * "clear peak" command is executed for the sensor in question. */ + struct ltc2978_data { enum chips id; - int vin_min, vin_max; - int temp_min, temp_max[2]; - int vout_min[8], vout_max[8]; - int iout_max[2]; - int temp2_max; + u16 vin_min, vin_max; + u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES]; + u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES]; + u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES]; + u16 iin_max; + u16 temp2_max; struct pmbus_driver_info info; }; @@ -167,9 +185,9 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) LTC2978_MFR_TEMPERATURE_MIN); if (ret >= 0) { if (lin11_to_val(ret) - < lin11_to_val(data->temp_min)) - data->temp_min = ret; - ret = data->temp_min; + < lin11_to_val(data->temp_min[page])) + data->temp_min[page] = ret; + ret = data->temp_min[page]; } break; case PMBUS_VIRT_READ_IOUT_MAX: @@ -185,6 +203,41 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg) return ret; } +static int ltc2974_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, LTC2974_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_IOUT_MIN: + ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_MIN); + if (ret >= 0) { + if (lin11_to_val(ret) + < lin11_to_val(data->iout_min[page])) + data->iout_min[page] = ret; + ret = data->iout_min[page]; + } + break; + case PMBUS_VIRT_RESET_IOUT_HISTORY: + ret = 0; + break; + default: + ret = ltc2978_read_word_data(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); @@ -226,15 +279,41 @@ static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg) return ret; } +static int ltc3883_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_IIN_MAX: + ret = pmbus_read_word_data(client, page, LTC3883_MFR_IIN_PEAK); + if (ret >= 0) { + if (lin11_to_val(ret) + > lin11_to_val(data->iin_max)) + data->iin_max = ret; + ret = data->iin_max; + } + break; + case PMBUS_VIRT_RESET_IIN_HISTORY: + ret = 0; + break; + default: + ret = ltc3880_read_word_data(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 + if (id == ltc3880 || id == ltc3883) ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS); + else + ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); return ret; } @@ -247,8 +326,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, int ret; switch (reg) { + case PMBUS_VIRT_RESET_IIN_HISTORY: + data->iin_max = 0x7c00; + ret = ltc2978_clear_peaks(client, page, data->id); + break; case PMBUS_VIRT_RESET_IOUT_HISTORY: data->iout_max[page] = 0x7c00; + data->iout_min[page] = 0xfbff; ret = ltc2978_clear_peaks(client, page, data->id); break; case PMBUS_VIRT_RESET_TEMP2_HISTORY: @@ -266,7 +350,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, ret = ltc2978_clear_peaks(client, page, data->id); break; case PMBUS_VIRT_RESET_TEMP_HISTORY: - data->temp_min = 0x7bff; + data->temp_min[page] = 0x7bff; data->temp_max[page] = 0x7c00; ret = ltc2978_clear_peaks(client, page, data->id); break; @@ -278,8 +362,10 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, } static const struct i2c_device_id ltc2978_id[] = { + {"ltc2974", ltc2974}, {"ltc2978", ltc2978}, {"ltc3880", ltc3880}, + {"ltc3883", ltc3883}, {} }; MODULE_DEVICE_TABLE(i2c, ltc2978_id); @@ -304,10 +390,14 @@ static int ltc2978_probe(struct i2c_client *client, if (chip_id < 0) return chip_id; - if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) { + if (chip_id == LTC2974_ID) { + data->id = ltc2974; + } else 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 if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) { + data->id = ltc3883; } else { dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id); return -ENODEV; @@ -323,26 +413,45 @@ static int ltc2978_probe(struct i2c_client *client, data->vin_min = 0x7bff; data->vin_max = 0x7c00; - data->temp_min = 0x7bff; + for (i = 0; i < ARRAY_SIZE(data->vout_min); i++) + data->vout_min[i] = 0xffff; + for (i = 0; i < ARRAY_SIZE(data->iout_min); i++) + data->iout_min[i] = 0xfbff; + for (i = 0; i < ARRAY_SIZE(data->iout_max); i++) + data->iout_max[i] = 0x7c00; + for (i = 0; i < ARRAY_SIZE(data->temp_min); i++) + data->temp_min[i] = 0x7bff; for (i = 0; i < ARRAY_SIZE(data->temp_max); i++) data->temp_max[i] = 0x7c00; data->temp2_max = 0x7c00; switch (data->id) { + case ltc2974: + info->read_word_data = ltc2974_read_word_data; + info->pages = LTC2974_NUM_PAGES; + info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT + | PMBUS_HAVE_TEMP2; + for (i = 0; i < info->pages; i++) { + info->func[i] |= PMBUS_HAVE_VOUT + | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; + } + break; case ltc2978: info->read_word_data = ltc2978_read_word_data; - info->pages = 8; + info->pages = LTC2978_NUM_PAGES; info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; - for (i = 1; i < 8; i++) { + for (i = 1; i < LTC2978_NUM_PAGES; i++) { info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; } break; case ltc3880: info->read_word_data = ltc3880_read_word_data; - info->pages = 2; + info->pages = LTC3880_NUM_PAGES; info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT @@ -353,15 +462,20 @@ static int ltc2978_probe(struct i2c_client *client, | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; - data->iout_max[0] = 0x7c00; - data->iout_max[1] = 0x7c00; + break; + case ltc3883: + info->read_word_data = ltc3883_read_word_data; + info->pages = LTC3883_NUM_PAGES; + 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_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; break; default: return -ENODEV; } - for (i = 0; i < info->pages; i++) - data->vout_min[i] = 0xffff; - return pmbus_do_probe(client, id, info); } @@ -378,5 +492,5 @@ static struct i2c_driver ltc2978_driver = { module_i2c_driver(ltc2978_driver); MODULE_AUTHOR("Guenter Roeck"); -MODULE_DESCRIPTION("PMBus driver for LTC2978 and LTC3880"); +MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, and LTC3883"); MODULE_LICENSE("GPL"); |