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isl9238: Add support for providing power using OTG

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BRANCH=none
BUG=b:66575472
TEST=Flash lux and wand, wand can provide power to lux.

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Change-Id: I59091c509b78bacf9f382550ab380a77fbf68ba9
Reviewed-on: https://chromium-review.googlesource.com/725122
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Nicolas Boichat
2017-10-18 10:05:56 +08:00
committed by chrome-bot
parent 6336a7c751
commit ccfc005fa4
3 changed files with 69 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
driver/charger/isl923x.c
View File

@@ -97,6 +97,49 @@ int charger_get_input_current(int *input_current)
return EC_SUCCESS;
}
#ifdef CONFIG_CHARGER_ISL9238
int charger_enable_otg_power(int enabled)
{
int rv, control1;
rv = raw_read16(ISL923X_REG_CONTROL1, &control1);
if (rv)
return rv;
if (enabled)
control1 |= ISL923X_C1_OTG;
else
control1 &= ~ISL923X_C1_OTG;
return raw_write16(ISL923X_REG_CONTROL1, control1);
}
/*
* TODO(b:67920792): OTG is not implemented for ISL9237 that has different
* register scale and range.
*/
int charger_set_otg_current_voltage(int output_current, int output_voltage)
{
int rv;
uint16_t volt_reg = (output_voltage / ISL9238_OTG_VOLTAGE_STEP)
<< ISL9238_OTG_VOLTAGE_SHIFT;
uint16_t current_reg = (output_current / ISL923X_OTG_CURRENT_STEP)
<< ISL923X_OTG_CURRENT_SHIFT;
if (output_current < 0 || output_current > ISL923X_OTG_CURRENT_MAX ||
output_voltage > ISL9238_OTG_VOLTAGE_MAX)
return EC_ERROR_INVAL;
/* Set voltage. */
rv = raw_write16(ISL923X_REG_OTG_VOLTAGE, volt_reg);
if (rv)
return rv;
/* Set current. */
return raw_write16(ISL923X_REG_OTG_CURRENT, current_reg);
}
#endif /* CONFIG_CHARGER_ISL9238 */
int charger_manufacturer_id(int *id)
{
int rv;

10
driver/charger/isl923x.h
View File

@@ -211,10 +211,16 @@
#define ISL9238_C3_PSYS_GAIN (1 << 9)
/* OTG voltage limit in mV, current limit in mA */
#define ISL923X_OTG_VOLTAGE_MIN 4864
#define ISL923X_OTG_VOLTAGE_MAX 5376
#define ISL9237_OTG_VOLTAGE_MIN 4864
#define ISL9237_OTG_VOLTAGE_MAX 5376
#define ISL9238_OTG_VOLTAGE_MAX 27456
#define ISL923X_OTG_CURRENT_MAX 4096
#define ISL9238_OTG_VOLTAGE_STEP 12
#define ISL9238_OTG_VOLTAGE_SHIFT 3
#define ISL923X_OTG_CURRENT_STEP 128
#define ISL923X_OTG_CURRENT_SHIFT 7
/* Info register fields */
#define ISL9237_INFO_PROG_RESISTOR_MASK 0xf
#define ISL923X_INFO_TRICKLE_ACTIVE_MASK (1 << 4)

20
include/charger.h
View File

@@ -65,11 +65,27 @@ int charger_get_status(int *status);
int charger_set_mode(int mode);
/**
* For chargers that are able to supply 5V output power for OTG dongle, this
* function enables or disables 5V power output.
* For chargers that are able to supply output power for OTG dongle, this
* function enables or disables power output.
*/
int charger_enable_otg_power(int enabled);
/**
* Sets OTG current limit and voltage (independent of whether OTG power is
* currently enabled).
*
* Depending on the charger and use case, one needs to be careful about
* changing the current/voltage while OTG power is enabled, and it might be wise
* to reset the value before enabling OTG power to ensure one does not provide
* excessive voltage to a device.
*
* @param output_current Requested current limit in mA.
* @param output_voltage Requested voltage in mV.
*
* @return EC_SUCCESS on success, an error otherwise.
*/
int charger_set_otg_current_voltage(int output_current, int output_voltage);
/**
* Return the closest match the charger can supply to the requested current.
*