hwmon: (lm90) Add support for TI TMP451

TI TMP451 is mostly compatible with ADT7461, except for
local temperature low byte and max conversion rate.
Add support to the LM90 driver.

Signed-off-by: Wei Ni <wni@nvidia.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 37 insertions, 8 deletions

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 6b0a39264bb0..03735c490891 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -60,6 +60,11 @@
  * This driver also supports the G781 from GMT. This device is compatible
  * with the ADM1032.
  *
+ * This driver also supports TMP451 from Texas Instruments. This device is
+ * supported in both compatibility and extended mode. It's mostly compatible
+ * with ADT7461 except for local temperature low byte register and max
+ * conversion rate.
+ *
  * Since the LM90 was the first chipset supported by this driver, most
  * comments will refer to this chipset, but are actually general and
  * concern all supported chipsets, unless mentioned otherwise.
@@ -111,7 +116,7 @@ static const unsigned short normal_i2c[] = {
         0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 
 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
-        max6646, w83l771, max6696, sa56004, g781 };
+        max6646, w83l771, max6696, sa56004, g781, tmp451 };
 
 /*
  * The LM90 registers
@@ -168,6 +173,9 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
 #define LM90_DEF_CONVRATE_RVAL  6       /* Def conversion rate register value */
 #define LM90_MAX_CONVRATE_MS    16000   /* Maximum conversion rate in ms */
 
+/* TMP451 registers */
+#define TMP451_REG_R_LOCAL_TEMPL        0x15
+
 /*
  * Device flags
  */
@@ -223,6 +231,7 @@ static const struct i2c_device_id lm90_id[] = {
         { "nct1008", adt7461 },
         { "w83l771", w83l771 },
         { "sa56004", sa56004 },
+        { "tmp451", tmp451 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, lm90_id);
@@ -311,6 +320,13 @@ static const struct lm90_params lm90_params[] = {
                 .max_convrate = 9,
                 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
         },
+        [tmp451] = {
+                .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
+                  | LM90_HAVE_BROKEN_ALERT,
+                .alert_alarms = 0x7c,
+                .max_convrate = 9,
+                .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
+        }
 };
 
 /*
@@ -746,7 +762,7 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
         struct lm90_data *data = lm90_update_device(dev);
         int temp;
 
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
         else if (data->kind == max6646)
                 temp = temp_from_u8(data->temp8[attr->index]);
@@ -790,7 +806,7 @@ static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
                 val -= 16000;
 
         mutex_lock(&data->update_lock);
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 data->temp8[nr] = temp_to_u8_adt7461(data, val);
         else if (data->kind == max6646)
                 data->temp8[nr] = temp_to_u8(val);
@@ -812,7 +828,7 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
         struct lm90_data *data = lm90_update_device(dev);
         int temp;
 
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
         else if (data->kind == max6646)
                 temp = temp_from_u16(data->temp11[attr->index]);
@@ -858,7 +874,7 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
                 val -= 16000;
 
         mutex_lock(&data->update_lock);
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 data->temp11[index] = temp_to_u16_adt7461(data, val);
         else if (data->kind == max6646)
                 data->temp11[index] = temp_to_u8(val) << 8;
@@ -887,7 +903,7 @@ static ssize_t show_temphyst(struct device *dev,
         struct lm90_data *data = lm90_update_device(dev);
         int temp;
 
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
         else if (data->kind == max6646)
                 temp = temp_from_u8(data->temp8[attr->index]);
@@ -915,7 +931,7 @@ static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
                 return err;
 
         mutex_lock(&data->update_lock);
-        if (data->kind == adt7461)
+        if (data->kind == adt7461 || data->kind == tmp451)
                 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
         else if (data->kind == max6646)
                 temp = temp_from_u8(data->temp8[LOCAL_CRIT]);
@@ -1348,6 +1364,19 @@ static int lm90_detect(struct i2c_client *client,
                  && (config1 & 0x3F) == 0x00
                  && convrate <= 0x08)
                         name = "g781";
+        } else
+        if (address == 0x4C
+         && man_id == 0x55) { /* Texas Instruments */
+                int local_ext;
+
+                local_ext = i2c_smbus_read_byte_data(client,
+                                                     TMP451_REG_R_LOCAL_TEMPL);
+
+                if (chip_id == 0x00 /* TMP451 */
+                 && (config1 & 0x1B) == 0x00
+                 && convrate <= 0x09
+                 && (local_ext & 0x0F) == 0x00)
+                        name = "tmp451";
         }
 
         if (!name) { /* identification failed */
@@ -1409,7 +1438,7 @@ static void lm90_init_client(struct i2c_client *client)
         data->config_orig = config;
 
         /* Check Temperature Range Select */
-        if (data->kind == adt7461) {
+        if (data->kind == adt7461 || data->kind == tmp451) {
                 if (config & 0x04)
                         data->flags |= LM90_FLAG_ADT7461_EXT;
         }