hwmon: (pmbus/ltc2978) Add support for LTC2974 and LTC3883
authorGuenter Roeck <linux@roeck-us.net>
Sun, 27 Jan 2013 17:24:28 +0000 (09:24 -0800)
committerGuenter Roeck <linux@roeck-us.net>
Mon, 8 Apr 2013 04:16:41 +0000 (21:16 -0700)
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Documentation/hwmon/ltc2978
drivers/hwmon/pmbus/Kconfig
drivers/hwmon/pmbus/ltc2978.c

index dcb10be36e7f78702d188fb5d7d76d938d9e73fa..dc0d08c61305469305d86f2f3cd04a32fa2e56c6 100644 (file)
@@ -2,6 +2,10 @@ Kernel driver ltc2978
 =====================
 
 Supported chips:
+  * Linear Technology LTC2974
+    Prefix: 'ltc2974'
+    Addresses scanned: -
+    Datasheet: http://www.linear.com/product/ltc2974
   * Linear Technology LTC2978
     Prefix: 'ltc2978'
     Addresses scanned: -
@@ -10,6 +14,10 @@ Supported chips:
     Prefix: 'ltc3880'
     Addresses scanned: -
     Datasheet: http://www.linear.com/product/ltc3880
+  * Linear Technology LTC3883
+    Prefix: 'ltc3883'
+    Addresses scanned: -
+    Datasheet: http://www.linear.com/product/ltc3883
 
 Author: Guenter Roeck <linux@roeck-us.net>
 
@@ -17,9 +25,9 @@ Author: Guenter Roeck <linux@roeck-us.net>
 Description
 -----------
 
-The LTC2978 is an octal power supply monitor, supervisor, sequencer and
-margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
-step-down switching regulator controller.
+LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
+monitor. LTC3880 is a dual output poly-phase step-down DC/DC controller. LTC3883
+is a single phase step-down DC/DC controller.
 
 
 Usage Notes
@@ -41,60 +49,90 @@ Sysfs attributes
 in1_label              "vin"
 in1_input              Measured input voltage.
 in1_min                        Minimum input voltage.
-in1_max                        Maximum input voltage. LTC2978 only.
-in1_lcrit              Critical minimum input voltage. LTC2978 only.
+in1_max                        Maximum input voltage. LTC2974 and LTC2978 only.
+in1_lcrit              Critical minimum input voltage. LTC2974 and LTC2978
+                       only.
 in1_crit               Critical maximum input voltage.
 in1_min_alarm          Input voltage low alarm.
-in1_max_alarm          Input voltage high alarm. LTC2978 only.
-in1_lcrit_alarm                Input voltage critical low alarm. LTC2978 only.
+in1_max_alarm          Input voltage high alarm. LTC2974 and LTC2978 only.
+in1_lcrit_alarm                Input voltage critical low alarm. LTC2974 and LTC2978
+                       only.
 in1_crit_alarm         Input voltage critical high alarm.
-in1_lowest             Lowest input voltage. LTC2978 only.
+in1_lowest             Lowest input voltage. LTC2974 and LTC2978 only.
 in1_highest            Highest input voltage.
 in1_reset_history      Reset input voltage history.
 
-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.
-in[2-9]_lcrit          Critical minimum output voltage.
-in[2-9]_crit           Critical maximum output voltage.
-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. LTC2978 only.
-in[2-9]_highest                Lowest output voltage.
-in[2-9]_reset_history  Reset output voltage history.
-
-temp[1-3]_input                Measured temperature.
+in[N]_label            "vout[1-8]".
+                       LTC2974: N=2-5
+                       LTC2978: N=2-9
+                       LTC3880: N=2-3
+                       LTC3883: N=2
+in[N]_input            Measured output voltage.
+in[N]_min              Minimum output voltage.
+in[N]_max              Maximum output voltage.
+in[N]_lcrit            Critical minimum output voltage.
+in[N]_crit             Critical maximum output voltage.
+in[N]_min_alarm                Output voltage low alarm.
+in[N]_max_alarm                Output voltage high alarm.
+in[N]_lcrit_alarm      Output voltage critical low alarm.
+in[N]_crit_alarm       Output voltage critical high alarm.
+in[N]_lowest           Lowest output voltage. LTC2974 and LTC2978 only.
+in[N]_highest          Highest output voltage.
+in[N]_reset_history    Reset output voltage history.
+
+temp[N]_input          Measured temperature.
+                       On LTC2974, temp[1-4] report external temperatures,
+                       and temp5 reports the chip temperature.
                        On LTC2978, only one temperature measurement is
                        supported and reports the chip temperature.
                        On LTC3880, temp1 and temp2 report external
-                       temperatures, and temp3 reports the chip
-                       temperature.
-temp[1-3]_min          Mimimum temperature. LTC2978 only.
-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    Temperature low alarm. LTC2978 only.
-temp[1-3]_max_alarm    Temperature high alarm.
-temp[1-3]_lcrit_alarm  Temperature critical low alarm.
-temp[1-3]_crit_alarm   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 temperature history.
-
-power[1-2]_label       "pout[1-2]". LTC3880 only.
-power[1-2]_input       Measured power.
-
-curr1_label            "iin". LTC3880 only.
+                       temperatures, and temp3 reports the chip temperature.
+                       On LTC3883, temp1 reports an external temperature,
+                       and temp2 reports the chip temperature.
+temp[N]_min            Mimimum temperature. LTC2974 and LTC2978 only.
+temp[N]_max            Maximum temperature.
+temp[N]_lcrit          Critical low temperature.
+temp[N]_crit           Critical high temperature.
+temp[N]_min_alarm      Temperature low alarm. LTC2974 and LTC2978 only.
+temp[N]_max_alarm      Temperature high alarm.
+temp[N]_lcrit_alarm    Temperature critical low alarm.
+temp[N]_crit_alarm     Temperature critical high alarm.
+temp[N]_lowest         Lowest measured temperature. LTC2974 and LTC2978 only.
+                       Not supported for chip temperature sensor on LTC2974.
+temp[N]_highest                Highest measured temperature. Not supported for chip
+                       temperature sensor on LTC2974.
+temp[N]_reset_history  Reset temperature history. Not supported for chip
+                       temperature sensor on LTC2974.
+
+power1_label           "pin". LTC3883 only.
+power1_input           Measured input power.
+
+power[N]_label         "pout[1-4]".
+                       LTC2974: N=1-4
+                       LTC2978: Not supported
+                       LTC3880: N=1-2
+                       LTC3883: N=2
+power[N]_input         Measured output power.
+
+curr1_label            "iin". LTC3880 and LTC3883 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 output current.
-curr[2-3]_max          Maximum output current.
-curr[2-3]_crit         Critical output current.
-curr[2-3]_max_alarm    Output current high alarm.
-curr[2-3]_crit_alarm   Output current critical high alarm.
+curr1_highest          Highest input current. LTC3883 only.
+curr1_reset_history    Reset input current history. LTC3883 only.
+
+curr[N]_label          "iout[1-4]".
+                       LTC2974: N=1-4
+                       LTC2978: not supported
+                       LTC3880: N=2-3
+                       LTC3883: N=2
+curr[N]_input          Measured output current.
+curr[N]_max            Maximum output current.
+curr[N]_crit           Critical high output current.
+curr[N]_lcrit          Critical low output current. LTC2974 only.
+curr[N]_max_alarm      Output current high alarm.
+curr[N]_crit_alarm     Output current critical high alarm.
+curr[N]_lcrit_alarm    Output current critical low alarm. LTC2974 only.
+curr[N]_lowest         Lowest output current. LTC2974 only.
+curr[N]_highest                Highest output current.
+curr[N]_reset_history  Reset output current history.
index 4f9eb0af5229b0e47dbbc7ad27d51d792de9bbb7..b1adad60d6ada48785910a014ff01aba65f53f73 100644 (file)
@@ -48,11 +48,11 @@ config SENSORS_LM25066
          be called lm25066.
 
 config SENSORS_LTC2978
-       tristate "Linear Technologies LTC2978 and LTC3880"
+       tristate "Linear Technologies LTC2974, LTC2978, LTC3880, and LTC3883"
        default n
        help
          If you say yes here you get hardware monitoring support for Linear
-         Technology LTC2978 and LTC3880.
+         Technology LTC2974, LTC2978, LTC3880, and LTC3883.
 
          This driver can also be built as a module. If so, the module will
          be called ltc2978.
index 945f7eced409f644cccf58f6a4af95f2fa9171bb..586a89ef9e0f4f28a6264fd48e00273fad2a1c5a 100644 (file)
@@ -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
 #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
@@ -63,9 +76,10 @@ enum chips { ltc2978, ltc3880 };
 struct ltc2978_data {
        enum chips id;
        u16 vin_min, vin_max;
-       u16 temp_min, temp_max[LTC3880_NUM_PAGES];
+       u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
        u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
-       u16 iout_max[LTC3880_NUM_PAGES];
+       u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
+       u16 iin_max;
        u16 temp2_max;
        struct pmbus_driver_info info;
 };
@@ -171,9 +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:
@@ -189,6 +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);
@@ -230,15 +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;
 }
@@ -251,8 +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:
@@ -270,7 +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;
@@ -282,8 +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);
@@ -308,10 +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;
@@ -329,12 +415,29 @@ static int ltc2978_probe(struct i2c_client *client,
        data->vin_max = 0x7c00;
        for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
                data->vout_min[i] = 0xffff;
-       data->temp_min = 0x7bff;
+       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 = LTC2978_NUM_PAGES;
@@ -359,8 +462,16 @@ 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;
@@ -381,5 +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");