diff options
Diffstat (limited to 'driver/temp_sensor/g781.c')
| -rw-r--r-- | driver/temp_sensor/g781.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/driver/temp_sensor/g781.c b/driver/temp_sensor/g781.c new file mode 100644 index 0000000000..389b12629e --- /dev/null +++ b/driver/temp_sensor/g781.c @@ -0,0 +1,210 @@ +/* Copyright (c) 2013 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. + */ + +/* G781 temperature sensor module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "gpio.h" +#include "i2c.h" +#include "hooks.h" +#include "temp_sensor_g781.h" +#include "util.h" + +static int g781_temp_val_local; +static int g781_temp_val_remote; + +/** + * Determine whether the sensor is powered. + * + * @return non-zero the g781 sensor is powered. + */ +static int g781_has_power(void) +{ +#ifdef CONFIG_TEMP_SENSOR_POWER_GPIO + return gpio_get_level(CONFIG_TEMP_SENSOR_POWER_GPIO); +#else + return 1; +#endif +} + +static int g781_read8(const int offset, int *data_ptr) +{ + return i2c_read8(I2C_PORT_THERMAL, G781_I2C_ADDR, offset, data_ptr); +} + +static int g781_write8(const int offset, int data) +{ + return i2c_write8(I2C_PORT_THERMAL, G781_I2C_ADDR, offset, data); +} + +static int g781_get_temp(const int offset, int *temp_ptr) +{ + int rv; + int temp_raw = 0; + + rv = g781_read8(offset, &temp_raw); + if (rv < 0) + return rv; + + *temp_ptr = (int)(int8_t)temp_raw; + return EC_SUCCESS; +} + +static int g781_set_temp(const int offset, int temp) +{ + if (temp < -127 || temp > 127) + return EC_ERROR_INVAL; + + return g781_write8(offset, (uint8_t)temp); +} + +int g781_get_val(int idx, int *temp_ptr) +{ + if (!g781_has_power()) + return EC_ERROR_NOT_POWERED; + + switch (idx) { + case G781_IDX_INTERNAL: + *temp_ptr = g781_temp_val_local; + break; + case G781_IDX_EXTERNAL: + *temp_ptr = g781_temp_val_remote; + break; + default: + return EC_ERROR_UNKNOWN; + } + + return EC_SUCCESS; +} + +static void g781_temp_sensor_poll(void) +{ + if (!g781_has_power()) + return; + + g781_get_temp(G781_TEMP_LOCAL, &g781_temp_val_local); + g781_temp_val_local = C_TO_K(g781_temp_val_local); + + g781_get_temp(G781_TEMP_REMOTE, &g781_temp_val_remote); + g781_temp_val_remote = C_TO_K(g781_temp_val_remote); +} +DECLARE_HOOK(HOOK_SECOND, g781_temp_sensor_poll, HOOK_PRIO_TEMP_SENSOR); + +static int g781_show_status(void) +{ + int value; + int rv; + + + rv = g781_get_temp(G781_TEMP_LOCAL, &value); + if (rv < 0) + return rv; + ccprintf("Local Temp: %3dC\n", value); + + rv = g781_get_temp(G781_LOCAL_TEMP_THERM_LIMIT, &value); + if (rv < 0) + return rv; + ccprintf(" Therm Trip: %3dC\n", value); + + rv = g781_get_temp(G781_LOCAL_TEMP_HIGH_LIMIT_R, &value); + if (rv < 0) + return rv; + ccprintf(" High Alarm: %3dC\n", value); + + rv = g781_get_temp(G781_LOCAL_TEMP_LOW_LIMIT_R, &value); + if (rv < 0) + return rv; + ccprintf(" Low Alarm: %3dC\n", value); + + rv = g781_get_temp(G781_TEMP_REMOTE, &value); + if (rv < 0) + return rv; + ccprintf("Remote Temp: %3dC\n", value); + + rv = g781_get_temp(G781_REMOTE_TEMP_THERM_LIMIT, &value); + if (rv < 0) + return rv; + ccprintf(" Therm Trip: %3dC\n", value); + + rv = g781_get_temp(G781_REMOTE_TEMP_HIGH_LIMIT_R, &value); + if (rv < 0) + return rv; + ccprintf(" High Alarm: %3dC\n", value); + + rv = g781_get_temp(G781_REMOTE_TEMP_LOW_LIMIT_R, &value); + if (rv < 0) + return rv; + ccprintf(" Low Alarm: %3dC\n", value); + + rv = g781_read8(G781_STATUS, &value); + if (rv < 0) + return rv; + ccprintf("\nSTATUS: %08b\n", value); + + rv = g781_read8(G781_CONFIGURATION_R, &value); + if (rv < 0) + return rv; + ccprintf("CONFIG: %08b\n", value); + + return EC_SUCCESS; +} + +static int command_g781(int argc, char **argv) +{ + char *command; + char *e; + int data; + int offset; + int rv; + + if (!g781_has_power()) { + ccprintf("ERROR: Temp sensor not powered.\n"); + return EC_ERROR_NOT_POWERED; + } + + /* If no args just print status */ + if (argc == 1) + return g781_show_status(); + + if (argc < 3) + return EC_ERROR_PARAM_COUNT; + + command = argv[1]; + offset = strtoi(argv[2], &e, 0); + if (*e || offset < 0 || offset > 255) + return EC_ERROR_PARAM2; + + if (!strcasecmp(command, "getbyte")) { + rv = g781_read8(offset, &data); + if (rv < 0) + return rv; + ccprintf("Byte at offset 0x%02x is %08b\n", offset, data); + return rv; + } + + /* Remaining commands are of the form "g781 set-command offset data" */ + if (argc != 4) + return EC_ERROR_PARAM_COUNT; + + data = strtoi(argv[3], &e, 0); + if (*e) + return EC_ERROR_PARAM3; + + if (!strcasecmp(command, "settemp")) { + ccprintf("Setting 0x%02x to %dC\n", offset, data); + rv = g781_set_temp(offset, data); + } else if (!strcasecmp(command, "setbyte")) { + ccprintf("Setting 0x%02x to 0x%02x\n", offset, data); + rv = g781_write8(offset, data); + } else + return EC_ERROR_PARAM1; + + return rv; +} +DECLARE_CONSOLE_COMMAND(g781, command_g781, + "[settemp|setbyte <offset> <value>] or [getbyte <offset>]. " + "Temps in Celsius.", + "Print g781 temp sensor status or set parameters.", NULL); |