hw/sensor/tmp105: Lower 4 bit of limit registers are always 0

Per datasheet, "HIGH AND LOW LIMIT REGISTERS", the lower 4 bit
of the limit registers are unused and always report 0.
The lower 4 bit should not be used for temperature comparisons,
so mask the unused bits before storing the limits.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20240906154911.86803-6-philmd@linaro.org>
[PMD: Update tests/qtest/ files]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

diff --git a/hw/sensor/tmp105.c b/hw/sensor/tmp105.c
index f5101af9193935ed6dcdeb006028393c93ad88ae..9d7b911f59685391bba5cb07d1e3cef238ee2c17 100644 (file)
--- a/hw/sensor/tmp105.c
+++ b/hw/sensor/tmp105.c
@@ -171,7 +171,7 @@ static void tmp105_write(TMP105State *s)
     case TMP105_REG_T_HIGH:
         if (s->len >= 3) {
             s->limit[s->pointer & 1] = (int16_t)
-                    ((((uint16_t) s->buf[0]) << 8) | s->buf[1]);
+                    ((((uint16_t) s->buf[0]) << 8) | (s->buf[1] & 0xf0));
         }
         tmp105_alarm_update(s, false);
         break;

diff --git a/tests/qtest/bcm2835-i2c-test.c b/tests/qtest/bcm2835-i2c-test.c
index 513ecce61dc69b798b2a108f83337cb3b65f9995..159919492604df55bfebbbdeca6136c0e9f3642d 100644 (file)
--- a/tests/qtest/bcm2835-i2c-test.c
+++ b/tests/qtest/bcm2835-i2c-test.c
@@ -81,7 +81,7 @@ static void test_i2c_read_write(gconstpointer data)
     g_assert_cmpint(i2cdata, ==, 0xde);
 
     i2cdata = readl(base_addr + BCM2835_I2C_FIFO);
-    g_assert_cmpint(i2cdata, ==, 0xad);
+    g_assert_cmpint(i2cdata, ==, 0xa0);
 
     /* Clear flags */
     writel(base_addr + BCM2835_I2C_S, BCM2835_I2C_S_DONE | BCM2835_I2C_S_ERR |

diff --git a/tests/qtest/tmp105-test.c b/tests/qtest/tmp105-test.c
index 3678646df52c3faa9689c3118b721d8c7185a5b5..85ad4eed854847da5ae9169078d3e88b20af80a1 100644 (file)
--- a/tests/qtest/tmp105-test.c
+++ b/tests/qtest/tmp105-test.c
@@ -100,9 +100,9 @@ static void send_and_receive(void *obj, void *data, QGuestAllocator *alloc)
     g_assert_cmphex(value, ==, 0x14f0);
 
     i2c_set16(i2cdev, TMP105_REG_T_LOW, 0x1234);
-    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_LOW), ==, 0x1234);
+    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_LOW), ==, 0x1230);
     i2c_set16(i2cdev, TMP105_REG_T_HIGH, 0x4231);
-    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_HIGH), ==, 0x4231);
+    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_HIGH), ==, 0x4230);
 }
 
 static void tmp105_register_nodes(void)