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power: supply: sbs-battery: don't assume MANUFACTURER_DATA formats 

This driver was originally submitted for the TI BQ20Z75 battery IC
(commit a7640bfa10 ("power_supply: Add driver for TI BQ20Z75 gas gauge
IC")) and later renamed to express generic SBS support. While it's
mostly true that this driver implemented a standard SBS command set, it
takes liberties with the REG_MANUFACTURER_DATA register. This register
is specified in the SBS spec, but it doesn't make any mention of what
its actual contents are.

We've sort of noticed this optionality previously, with commit
17c6d3979e ("sbs-battery: make writes to ManufacturerAccess
optional"), where we found that some batteries NAK writes to this
register.

What this really means is that so far, we've just been lucky that most
batteries have either been compatible with the TI chip, or else at least
haven't reported highly-unexpected values.

For instance, one battery I have here seems to report either 0x0000 or
0x0100 to the MANUFACTURER_ACCESS_STATUS command -- while this seems to
match either Wake Up (bits[11:8] = 0000b) or Normal Discharge
(bits[11:8] = 0001b) status for the TI part [1], they don't seem to
actually correspond to real states (for instance, I never see 0101b =
Charge, even when charging).

On other batteries, I'm getting apparently random data in return, which
means that occasionally, we interpret this as "battery not present" or
"battery is not healthy".

All in all, it seems to be a really bad idea to make assumptions about
REG_MANUFACTURER_DATA, unless we already know what battery we're using.
Therefore, this patch reimplements the "present" and "health" checks to
the following on most SBS batteries:

1. HEALTH: report "unknown" -- I couldn't find a standard SBS command
   that gives us much useful here
2. PRESENT: just send a REG_STATUS command; if it succeeds, then the
   battery is present

Also, we stop sending MANUFACTURER_ACCESS_SLEEP to non-TI parts. I have
no proof that this is useful and supported.

If someone explicitly provided a 'ti,bq20z75' compatible property, then
we continue to use the existing TI command behaviors, and we effectively
revert commit 17c6d3979e ("sbs-battery: make writes to
ManufacturerAccess optional") to again make these commands required.

[1] http://www.ti.com/lit/er/sluu265a/sluu265a.pdf

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Brian Norris 2018-06-12 13:20:41 -07:00 committed by Sebastian Reichel
parent ce397d215c
commit 76b16f4cdf
1 changed files with 54 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
drivers/power/supply/sbs-battery.c
View File

@ -23,6 +23,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/power/sbs-battery.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
@ -156,6 +157,9 @@ static enum power_supply_property sbs_properties[] = {
POWER_SUPPLY_PROP_MODEL_NAME
};
/* Supports special manufacturer commands from TI BQ20Z75 IC. */
#define SBS_FLAGS_TI_BQ20Z75 BIT(0)
struct sbs_info {
struct i2c_client *client;
struct power_supply *power_supply;
@ -168,6 +172,7 @@ struct sbs_info {
u32 poll_retry_count;
struct delayed_work work;
struct mutex mode_lock;
u32 flags;
};
static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
@ -315,17 +320,41 @@ static int sbs_status_correct(struct i2c_client *client, int *intval)
static int sbs_get_battery_presence_and_health(
struct i2c_client *client, enum power_supply_property psp,
union power_supply_propval *val)
{
int ret;
if (psp == POWER_SUPPLY_PROP_PRESENT) {
/* Dummy command; if it succeeds, battery is present. */
ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
if (ret < 0)
val->intval = 0; /* battery disconnected */
else
val->intval = 1; /* battery present */
} else { /* POWER_SUPPLY_PROP_HEALTH */
/* SBS spec doesn't have a general health command. */
val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
}
return 0;
}
static int sbs_get_ti_battery_presence_and_health(
struct i2c_client *client, enum power_supply_property psp,
union power_supply_propval *val)
{
s32 ret;
/*
* Write to ManufacturerAccess with ManufacturerAccess command
* and then read the status. Do not check for error on the write
* since not all batteries implement write access to this command,
* while others mandate it.
* and then read the status.
*/
sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_STATUS);
ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_STATUS);
if (ret < 0) {
if (psp == POWER_SUPPLY_PROP_PRESENT)
val->intval = 0; /* battery removed */
return ret;
}
ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
if (ret < 0) {
@ -600,7 +629,12 @@ static int sbs_get_property(struct power_supply *psy,
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
case POWER_SUPPLY_PROP_HEALTH:
ret = sbs_get_battery_presence_and_health(client, psp, val);
if (client->flags & SBS_FLAGS_TI_BQ20Z75)
ret = sbs_get_ti_battery_presence_and_health(client,
psp, val);
else
ret = sbs_get_battery_presence_and_health(client, psp,
val);
if (psp == POWER_SUPPLY_PROP_PRESENT)
return 0;
break;
@ -806,6 +840,7 @@ static int sbs_probe(struct i2c_client *client,
if (!chip)
return -ENOMEM;
chip->flags = (u32)(uintptr_t)of_device_get_match_data(&client->dev);
chip->client = client;
chip->enable_detection = false;
psy_cfg.of_node = client->dev.of_node;
@ -911,16 +946,19 @@ static int sbs_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct sbs_info *chip = i2c_get_clientdata(client);
int ret;
if (chip->poll_time > 0)
cancel_delayed_work_sync(&chip->work);
/*
* Write to manufacturer access with sleep command.
* Support is manufacturer dependend, so ignore errors.
*/
sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_SLEEP);
if (chip->flags & SBS_FLAGS_TI_BQ20Z75) {
/* Write to manufacturer access with sleep command. */
ret = sbs_write_word_data(client,
sbs_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_SLEEP);
if (chip->is_present && ret < 0)
return ret;
}
return 0;
}
@ -941,7 +979,10 @@ MODULE_DEVICE_TABLE(i2c, sbs_id);
static const struct of_device_id sbs_dt_ids[] = {
{ .compatible = "sbs,sbs-battery" },
{ .compatible = "ti,bq20z75" },
{
.compatible = "ti,bq20z75",
.data = (void *)SBS_FLAGS_TI_BQ20Z75,
},
{ }
};
MODULE_DEVICE_TABLE(of, sbs_dt_ids);