Refactor temperature sensor code and add support of Link I2C temp sensor.

Refactor board/chip-specific code into corresponding directories.
Add support of the four I2C temp sensor in Link.
Use table lookup to handle different types of temperature sensors.

BUG=chrome-os-partner:7527
TEST=Correctly read EC internal temperature on bds.
Compile for link succeeded.

Change-Id: I694cfa54e1545798d877fafdf18c5585ab5f03e2

1 files changed, 142 insertions, 0 deletions

diff --git a/common/temp_sensor.c b/common/temp_sensor.c
new file mode 100644
index 0000000000..a517636ea2
--- /dev/null
+++ b/common/temp_sensor.c
@@ -0,0 +1,142 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Temperature sensor module for Chrome EC */
+
+#include "i2c.h"
+#include "temp_sensor.h"
+#include "uart.h"
+#include "util.h"
+#include "console.h"
+#include "board.h"
+
+/* Defined in board_temp_sensor.c. Must be in the same order as
+ * in enum temp_sensor_id.
+ */
+extern const struct temp_sensor_t temp_sensors[TEMP_SENSOR_COUNT];
+
+int temp_sensor_read(enum temp_sensor_id id)
+{
+	const struct temp_sensor_t *sensor;
+
+	if (id < 0 || id >= TEMP_SENSOR_COUNT)
+		return -1;
+	sensor = temp_sensors + id;
+	return sensor->read(sensor);
+}
+
+int temp_sensor_tmp006_read(const struct temp_sensor_t* sensor)
+{
+	int traw, t;
+	int rv;
+	int addr = sensor->addr;
+
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
+	if (rv)
+		return -1;
+	t = (int)(int16_t)traw / 128;
+	return t + 273;
+}
+
+void temp_sensor_tmp006_config(const struct temp_sensor_t* sensor)
+{
+	int addr = sensor->addr;
+
+	/* Configure the sensor:
+	 * 0x7000 = bits 14:12 = continuous conversion
+	 * 0x0400 = bits 11:9  = ADC conversion rate (1/sec)
+	 * 0x0100 = bit 8      = DRDY pin enabled */
+
+	/* TODO: support shutdown mode for power-saving? */
+	i2c_write16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, 0x7500);
+}
+
+int temp_sensor_tmp006_print(const struct temp_sensor_t* sensor)
+{
+	int vraw, v;
+	int traw, t;
+	int rv;
+	int d;
+	int addr = sensor->addr;
+
+	uart_printf("Debug data from %s:\n", sensor->name);
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xfe, &d);
+	if (rv)
+		return rv;
+	uart_printf("  Manufacturer ID: 0x%04x\n", d);
+
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xff, &d);
+	uart_printf("  Device ID:       0x%04x\n", d);
+
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &d);
+	uart_printf("  Config:          0x%04x\n", d);
+
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
+	v = ((int)(int16_t)vraw * 15625) / 100;
+	uart_printf("  Voltage:         0x%04x = %d nV\n", vraw, v);
+
+	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
+	t = ((int)(int16_t)traw * 100) / 128;
+	uart_printf("  Temperature:     0x%04x = %d.%02d C\n",
+		    traw, t / 100, t > 0 ? t % 100 : 100 - (t % 100));
+
+	return EC_SUCCESS;
+}
+/*****************************************************************************/
+/* Console commands */
+
+static int command_temps(int argc, char **argv)
+{
+	int i;
+	int rv = 0;
+	int t;
+
+	uart_puts("Reading temperature sensors...\n");
+
+	for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
+		uart_printf("  Temp from %s:  ", temp_sensors[i].name);
+		t = temp_sensor_read(temp_sensors[i].id);
+		if (t < 0) {
+			uart_printf("Error.\n\n");
+			rv = -1;
+		}
+		else
+			uart_printf("%d K\n\n", t);
+	}
+
+	if (rv == -1)
+		return EC_ERROR_UNKNOWN;
+
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(temps, command_temps);
+
+static int command_sensor_info(int argc, char ** argv)
+{
+	int i;
+	int rv;
+	const struct temp_sensor_t* sensor;
+
+	for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
+		sensor = temp_sensors + i;
+		if (sensor->print == TEMP_SENSOR_NO_PRINT)
+			continue;
+		rv = sensor->print(sensor);
+		if (rv != EC_SUCCESS)
+			return rv;
+	}
+
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(tempsinfo, command_sensor_info);
+
+
+/*****************************************************************************/
+/* Initialization */
+
+int temp_sensor_init(void)
+{
+	return EC_SUCCESS;
+}