diff options
Diffstat (limited to 'src/drivers/i2c/generic')
| -rw-r--r-- | src/drivers/i2c/generic/chip.h | 9 | ||||
| -rw-r--r-- | src/drivers/i2c/generic/generic.c | 43 |
2 files changed, 52 insertions, 0 deletions
diff --git a/src/drivers/i2c/generic/chip.h b/src/drivers/i2c/generic/chip.h index d84097f6c6..e84fc38df9 100644 --- a/src/drivers/i2c/generic/chip.h +++ b/src/drivers/i2c/generic/chip.h @@ -22,4 +22,13 @@ struct drivers_i2c_generic_config { /* GPIO used to indicate if this device is present */ unsigned device_present_gpio; unsigned device_present_gpio_invert; + + /* GPIO used to take device out of reset or to put it into reset. */ + unsigned reset_gpio; + /* Delay to be inserted after device is taken out of reset. */ + unsigned reset_delay_ms; + /* GPIO used to enable device. */ + unsigned enable_gpio; + /* Delay to be inserted after device is enabled. */ + unsigned enable_delay_ms; }; diff --git a/src/drivers/i2c/generic/generic.c b/src/drivers/i2c/generic/generic.c index c11a889d5b..34fbf77a3e 100644 --- a/src/drivers/i2c/generic/generic.c +++ b/src/drivers/i2c/generic/generic.c @@ -25,6 +25,46 @@ #include "chip.h" #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) + +static void i2c_generic_add_power_res(struct drivers_i2c_generic_config *config) +{ + const char *power_res_dev_states[] = { "_PR0", "_PR3" }; + + if (!config->reset_gpio && !config->enable_gpio) + return; + + /* PowerResource (PRIC, 0, 0) */ + acpigen_write_power_res("PRIC", 0, 0, power_res_dev_states, + ARRAY_SIZE(power_res_dev_states)); + + /* Method (_STA, 0, NotSerialized) { Return (0x1) } */ + acpigen_write_STA(0x1); + + /* Method (_ON, 0, Serialized) */ + acpigen_write_method_serialized("_ON", 0); + if (config->reset_gpio) + acpigen_soc_set_tx_gpio(config->reset_gpio); + if (config->enable_gpio) { + acpigen_soc_set_tx_gpio(config->enable_gpio); + acpigen_write_sleep(config->enable_delay_ms); + } + if (config->reset_gpio) { + acpigen_soc_clear_tx_gpio(config->reset_gpio); + acpigen_write_sleep(config->reset_delay_ms); + } + acpigen_pop_len(); /* _ON method */ + + /* Method (_OFF, 0, Serialized) */ + acpigen_write_method_serialized("_OFF", 0); + if (config->reset_gpio) + acpigen_soc_set_tx_gpio(config->reset_gpio); + if (config->enable_gpio) + acpigen_soc_clear_tx_gpio(config->enable_gpio); + acpigen_pop_len(); /* _OFF method */ + + acpigen_pop_len(); /* PowerResource PRIC */ +} + static void i2c_generic_fill_ssdt(struct device *dev) { struct drivers_i2c_generic_config *config = dev->chip_info; @@ -72,6 +112,9 @@ static void i2c_generic_fill_ssdt(struct device *dev) acpi_dp_write(dsd); } + /* Power Resource */ + i2c_generic_add_power_res(config); + acpigen_pop_len(); /* Device */ acpigen_pop_len(); /* Scope */ |