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Add support for BQ27742 battery gauge chip

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This reuses most of the existing BQ27541 driver, but changed necessary
parts to make it work.

BUG=none
TEST=Boot on Ryu. See battery charging.
BRANCH=factory-ryu-6212.B

Change-Id: I3a7325a821c81f84396bcc328036b6a5e7749a2e
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217198
Reviewed-by: Alec Berg <alecaberg@chromium.org>
(cherry picked from commit f44593e20bf61a2243d7baaae901c912ca798d75)
Reviewed-on: https://chromium-review.googlesource.com/218413
This commit is contained in:
Vic Yang
2014-09-09 23:00:33 -07:00
committed by chrome-internal-fetch
parent 5bc3dc3bbe
commit d86f672d14
1 changed files with 24 additions and 5 deletions
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29
driver/battery/bq27541.c
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@@ -2,17 +2,20 @@
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Battery driver for BQ27541.
* Battery driver for BQ27541/BQ27741/BQ27742.
*/
#include "battery.h"
#include "console.h"
#include "extpower.h"
#include "hooks.h"
#include "i2c.h"
#include "util.h"
#define BQ27541_ADDR 0xaa
#define BQ27541_TYPE_ID 0x0541
#define BQ27741_TYPE_ID 0x0741
#define BQ27742_TYPE_ID 0x0742
#define REG_CTRL 0x00
#define REG_AT_RATE 0x02
@@ -42,6 +45,8 @@
#define REG_DEVICE_NAME 0x63
#define REG_PROTECTOR 0x6d
static int battery_type_id;
static int bq27541_read(int offset, int *data)
{
return i2c_read16(I2C_PORT_BATTERY, BQ27541_ADDR, offset, data);
@@ -60,16 +65,25 @@ static int bq27541_write(int offset, int data)
int bq27541_probe(void)
{
int rv;
int dev_type;
rv = bq27541_write(REG_CTRL, 0x1);
rv |= bq27541_read(REG_CTRL, &dev_type);
rv |= bq27541_read(REG_CTRL, &battery_type_id);
if (rv)
return rv;
return (dev_type == BQ27541_TYPE_ID) ? EC_SUCCESS : EC_ERROR_UNKNOWN;
if (battery_type_id == BQ27541_TYPE_ID ||
battery_type_id == BQ27741_TYPE_ID ||
battery_type_id == BQ27742_TYPE_ID)
return EC_SUCCESS;
return EC_ERROR_UNKNOWN;
}
static void probe_type_id(void)
{
bq27541_probe();
}
DECLARE_HOOK(HOOK_INIT, probe_type_id, HOOK_PRIO_DEFAULT);
int battery_device_name(char *device_name, int buf_size)
{
int rv, i, val;
@@ -175,7 +189,12 @@ static int battery_charging_allowed(int *allowed)
rv = bq27541_read(REG_FLAGS, &val);
if (rv)
return rv;
*allowed = (val & 0x100);
if (battery_type_id == BQ27541_TYPE_ID ||
battery_type_id == BQ27741_TYPE_ID)
*allowed = (val & 0x100);
else /* BQ27742_TYPE_ID */
*allowed = (val & 0x8);
return EC_SUCCESS;
}