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link: allow to decrease maximum battery charging current

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Add an interface to allow the CPU to cap the maximum battery charging
current.
The maximum is removed every time the machine goes to S3 or S5.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=link
BUG=chrome-os-partner:16041
TEST=on Link, plug AC to charge the battery,
then run "ectool chargecurrentlimit 1200" and see
the charging current in "power-supply-info" decreasing to 1.2 A.

Change-Id: I10900e1c264d2db67809638ec0dcb836d721fa75
Reviewed-on: https://gerrit.chromium.org/gerrit/37532
Reviewed-by: Sameer Nanda <snanda@chromium.org>
Reviewed-by: Rong Chang <rongchang@chromium.org>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vincent Palatin
2012-11-07 09:39:33 -08:00
committed by Gerrit
parent 7551e8f57f
commit 3c575ccb02
3 changed files with 57 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
common/charge_state.c
View File

@@ -38,6 +38,8 @@ static const char * const state_name[] = POWER_STATE_NAME_TABLE;
static int state_machine_force_idle = 0;
static unsigned user_current_limit = -1U;
/* Current power state context */
static struct power_state_context task_ctx;
@@ -272,6 +274,8 @@ static int state_common(struct power_state_context *ctx)
if (batt->desired_current > CONFIG_CHARGING_CURRENT_LIMIT)
batt->desired_current = CONFIG_CHARGING_CURRENT_LIMIT;
#endif
if (batt->desired_current > user_current_limit)
batt->desired_current = user_current_limit;
if (battery_get_battery_mode(&d)) {
curr->error |= F_BATTERY_MODE;
@@ -842,3 +846,21 @@ static int charge_command_dump(struct host_cmd_handler_args *args)
}
DECLARE_HOST_COMMAND(EC_CMD_CHARGE_DUMP, charge_command_dump,
EC_VER_MASK(0));
static void reset_current_limit(void)
{
user_current_limit = -1;
}
DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, reset_current_limit, HOOK_PRIO_DEFAULT);
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, reset_current_limit, HOOK_PRIO_DEFAULT);
static int charge_command_current_limit(struct host_cmd_handler_args *args)
{
const struct ec_params_current_limit *p = args->params;
user_current_limit = p->limit;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_CHARGE_CURRENT_LIMIT, charge_command_current_limit,
EC_VER_MASK(0));

9
include/ec_commands.h
View File

@@ -1208,6 +1208,15 @@ struct ec_params_force_idle {
*/
#define EC_CMD_CHARGE_DUMP 0xa0
/*
* Set maximum battery charging current.
*/
#define EC_CMD_CHARGE_CURRENT_LIMIT 0xa1
struct ec_params_current_limit {
uint32_t limit;
} __packed;
/*****************************************************************************/
/* System commands */

26
util/ectool.c
View File

@@ -36,6 +36,8 @@ const char help_str[] =
" Prints battery info\n"
" batterycutoff\n"
" Cut off battery output power\n"
" chargecurrentlimit\n"
" Set the maximum battery charging current\n"
" chargedump\n"
" Dump the context of charge state machine\n"
" chargeforceidle\n"
@@ -1974,6 +1976,29 @@ int cmd_lcd_backlight(int argc, char *argv[])
}
int cmd_charge_current_limit(int argc, char *argv[])
{
struct ec_params_current_limit p;
int rv;
char *e;
if (argc != 2) {
fprintf(stderr, "Usage: %s <max_current_mA>\n", argv[0]);
return -1;
}
p.limit = strtol(argv[1], &e, 0);
if (e && *e) {
fprintf(stderr, "Bad value.\n");
return -1;
}
rv = ec_command(EC_CMD_CHARGE_CURRENT_LIMIT, 0, &p, sizeof(p),
NULL, 0);
return rv;
}
int cmd_charge_force_idle(int argc, char *argv[])
{
struct ec_params_force_idle p;
@@ -2669,6 +2694,7 @@ const struct command commands[] = {
{"backlight", cmd_lcd_backlight},
{"battery", cmd_battery},
{"batterycutoff", cmd_battery_cut_off},
{"chargecurrentlimit", cmd_charge_current_limit},
{"chargedump", cmd_charge_dump},
{"chargeforceidle", cmd_charge_force_idle},
{"chipinfo", cmd_chipinfo},