diff options
Diffstat (limited to 'driver/temp_sensor/g753.c')
| -rw-r--r-- | driver/temp_sensor/g753.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/driver/temp_sensor/g753.c b/driver/temp_sensor/g753.c new file mode 100644 index 0000000000..857263c161 --- /dev/null +++ b/driver/temp_sensor/g753.c @@ -0,0 +1,192 @@ +/* Copyright 2019 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. + */ + +/* G753 temperature sensor module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "g753.h" +#include "gpio.h" +#include "i2c.h" +#include "hooks.h" +#include "util.h" + +static int temp_val_local; + +/** + * Determine whether the sensor is powered. + * + * @return non-zero the g753 sensor is powered. + */ +static int has_power(void) +{ +#ifdef CONFIG_TEMP_SENSOR_POWER_GPIO + return gpio_get_level(CONFIG_TEMP_SENSOR_POWER_GPIO); +#else + return 1; +#endif +} + +static int raw_read8(const int offset, int *data_ptr) +{ + return i2c_read8(I2C_PORT_THERMAL, G753_I2C_ADDR_FLAGS, + offset, data_ptr); +} + +#ifdef CONFIG_CMD_TEMP_SENSOR +static int raw_write8(const int offset, int data) +{ + return i2c_write8(I2C_PORT_THERMAL, G753_I2C_ADDR_FLAGS, + offset, data); +} +#endif + +static int get_temp(const int offset, int *temp_ptr) +{ + int rv; + int temp_raw = 0; + + rv = raw_read8(offset, &temp_raw); + if (rv < 0) + return rv; + + *temp_ptr = (int)(int8_t)temp_raw; + return EC_SUCCESS; +} + +#ifdef CONFIG_CMD_TEMP_SENSOR +static int set_temp(const int offset, int temp) +{ + if (temp < -127 || temp > 127) + return EC_ERROR_INVAL; + + return raw_write8(offset, (uint8_t)temp); +} +#endif + +int g753_get_val(int idx, int *temp_ptr) +{ + if (!has_power()) + return EC_ERROR_NOT_POWERED; + + switch (idx) { + case G753_IDX_INTERNAL: + *temp_ptr = temp_val_local; + break; + default: + return EC_ERROR_UNKNOWN; + } + + return EC_SUCCESS; +} + +static void temp_sensor_poll(void) +{ + if (!has_power()) + return; + + get_temp(G753_TEMP_LOCAL, &temp_val_local); + temp_val_local = C_TO_K(temp_val_local); +} +DECLARE_HOOK(HOOK_SECOND, temp_sensor_poll, HOOK_PRIO_TEMP_SENSOR); + +#ifdef CONFIG_CMD_TEMP_SENSOR +static void print_temps(const char *name, + const int temp_reg, + const int high_limit_reg) +{ + int value; + + ccprintf("%s:\n", name); + + if (get_temp(temp_reg, &value) == EC_SUCCESS) + ccprintf(" Temp: %3dC\n", value); + + if (get_temp(high_limit_reg, &value) == EC_SUCCESS) + ccprintf(" High Alarm: %3dC\n", value); + +} + +static int print_status(void) +{ + int value; + + if (!has_power()) { + ccprintf("ERROR: Temp sensor not powered.\n"); + return EC_ERROR_NOT_POWERED; + } + + print_temps("Local", G753_TEMP_LOCAL, + G753_LOCAL_TEMP_HIGH_LIMIT_R); + + ccprintf("\n"); + + if (raw_read8(G753_STATUS, &value) == EC_SUCCESS) + ccprintf("STATUS: %pb\n", BINARY_VALUE(value, 8)); + + if (raw_read8(G753_CONFIGURATION_R, &value) == EC_SUCCESS) + ccprintf("CONFIG: %pb\n", BINARY_VALUE(value, 8)); + + return EC_SUCCESS; +} + +static int command_g753(int argc, char **argv) +{ + char *command; + char *e; + int data; + int offset; + int rv; + + if (!has_power()) { + ccprintf("ERROR: Temp sensor not powered.\n"); + return EC_ERROR_NOT_POWERED; + } + + /* If no args just print status */ + if (argc == 1) + return print_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 = raw_read8(offset, &data); + if (rv < 0) + return rv; + ccprintf("Byte at offset 0x%02x is %pb\n", + offset, BINARY_VALUE(data, 8)); + return rv; + } + + /* Remaining commands are of the form "g753 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 = set_temp(offset, data); + } else if (!strcasecmp(command, "setbyte")) { + ccprintf("Setting 0x%02x to 0x%02x\n", offset, data); + rv = raw_write8(offset, data); + } else + return EC_ERROR_PARAM1; + + return rv; +} +DECLARE_CONSOLE_COMMAND(g753, command_g753, + "[settemp|setbyte <offset> <value>] or [getbyte <offset>]. " + "Temps in Celsius.", + "Print g753 temp sensor status or set parameters."); +#endif |