hwmon: (ltc2978) Add support for LTC3882

[firefly-linux-kernel-4.4.55.git] / drivers / hwmon / pmbus / ltc2978.c

diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index 7e10fbf8e13375e07f5496ab7b7f3b49c54cecbd..28e1e735b5c235c79228e0c3b57effdea91b7683 100644 (file)
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -25,13 +25,13 @@
 #include <linux/regulator/driver.h>
 #include "pmbus.h"
 
-enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
+enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltm4676 };
 
 /* 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
+#define LTC2978_MFR_SPECIAL_ID         0xe7    /* Not on LTC3882 */
 
 /* LTC2974, LCT2977, and LTC2978 */
 #define LTC2978_MFR_VOUT_MIN           0xfb
@@ -42,7 +42,7 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
 #define LTC2974_MFR_IOUT_PEAK          0xd7
 #define LTC2974_MFR_IOUT_MIN           0xd8
 
-/* LTC3880, LTC3883, and LTM4676 */
+/* LTC3880, LTC3882, LTC3883, and LTM4676 */
 #define LTC3880_MFR_IOUT_PEAK          0xd7
 #define LTC3880_MFR_CLEAR_PEAKS                0xe3
 #define LTC3880_MFR_TEMPERATURE2_PEAK  0xf4
@@ -313,7 +313,7 @@ static int ltc2978_clear_peaks(struct i2c_client *client, int page,
 {
        int ret;
 
-       if (id == ltc3880 || id == ltc3883 || id == ltm4676)
+       if (id == ltc3880 || id == ltc3882 || id == ltc3883 || id == ltm4676)
                ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
        else
                ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
@@ -369,6 +369,7 @@ static const struct i2c_device_id ltc2978_id[] = {
        {"ltc2977", ltc2977},
        {"ltc2978", ltc2978},
        {"ltc3880", ltc3880},
+       {"ltc3882", ltc3882},
        {"ltc3883", ltc3883},
        {"ltm4676", ltm4676},
        {}
@@ -393,8 +394,30 @@ static int ltc2978_get_id(struct i2c_client *client)
        int chip_id;
 
        chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
-       if (chip_id < 0)
-               return chip_id;
+       if (chip_id < 0) {
+               const struct i2c_device_id *id;
+               u8 buf[I2C_SMBUS_BLOCK_MAX];
+               int ret;
+
+               if (!i2c_check_functionality(client->adapter,
+                                            I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+                       return -ENODEV;
+
+               ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+               if (ret < 0)
+                       return ret;
+               if (ret < 3 || strncmp(buf, "LTC", 3))
+                       return -ENODEV;
+
+               ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+               if (ret < 0)
+                       return ret;
+               for (id = &ltc2978_id[0]; strlen(id->name); id++) {
+                       if (!strncasecmp(id->name, buf, strlen(id->name)))
+                               return (int)id->driver_data;
+               }
+               return -ENODEV;
+       }
 
        if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
                return ltc2974;
@@ -498,6 +521,20 @@ static int ltc2978_probe(struct i2c_client *client,
                  | PMBUS_HAVE_POUT
                  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
                break;
+       case ltc3882:
+               info->read_word_data = ltc3880_read_word_data;
+               info->pages = LTC3880_NUM_PAGES;
+               info->func[0] = PMBUS_HAVE_VIN
+                 | 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;
+               break;
        case ltc3883:
                info->read_word_data = ltc3883_read_word_data;
                info->pages = LTC3883_NUM_PAGES;
@@ -530,6 +567,7 @@ static const struct of_device_id ltc2978_of_match[] = {
        { .compatible = "lltc,ltc2977" },
        { .compatible = "lltc,ltc2978" },
        { .compatible = "lltc,ltc3880" },
+       { .compatible = "lltc,ltc3882" },
        { .compatible = "lltc,ltc3883" },
        { .compatible = "lltc,ltm4676" },
        { }