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power: supply: sbs-battery: add PEC support

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SBS batteries optionally have support for PEC. This enables
PEC handling based on the implemented SBS version as suggested
by the standard. The support for PEC is re-evaluated when the
battery is hotplugged into the system, since there might be
systems supporting batteries from different SBS generations.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Sebastian Reichel 2020-05-13 20:56:04 +02:00 committed by Sebastian Reichel
parent c4b12a2f3f
commit 79bcd5a4a6
1 changed files with 69 additions and 3 deletions
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72
drivers/power/supply/sbs-battery.c
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@ -46,6 +46,14 @@ enum {
REG_MODEL_NAME,
};
#define REG_ADDR_SPEC_INFO 0x1A
#define SPEC_INFO_VERSION_MASK GENMASK(7, 4)
#define SPEC_INFO_VERSION_SHIFT 4
#define SBS_VERSION_1_0 1
#define SBS_VERSION_1_1 2
#define SBS_VERSION_1_1_WITH_PEC 3
/* Battery Mode defines */
#define BATTERY_MODE_OFFSET 0x03
#define BATTERY_MODE_CAPACITY_MASK BIT(15)
@ -175,6 +183,64 @@ static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
static bool force_load;
static int sbs_update_presence(struct sbs_info *chip, bool is_present)
{
struct i2c_client *client = chip->client;
int retries = chip->i2c_retry_count;
s32 ret = 0;
u8 version;
if (chip->is_present == is_present)
return 0;
if (!is_present) {
chip->is_present = false;
/* Disable PEC when no device is present */
client->flags &= ~I2C_CLIENT_PEC;
return 0;
}
/* Check if device supports packet error checking and use it */
while (retries > 0) {
ret = i2c_smbus_read_word_data(client, REG_ADDR_SPEC_INFO);
if (ret >= 0)
break;
/*
* Some batteries trigger the detection pin before the
* I2C bus is properly connected. This works around the
* issue.
*/
msleep(100);
retries--;
}
if (ret < 0) {
dev_dbg(&client->dev, "failed to read spec info: %d\n", ret);
/* fallback to old behaviour */
client->flags &= ~I2C_CLIENT_PEC;
chip->is_present = true;
return ret;
}
version = (ret & SPEC_INFO_VERSION_MASK) >> SPEC_INFO_VERSION_SHIFT;
if (version == SBS_VERSION_1_1_WITH_PEC)
client->flags |= I2C_CLIENT_PEC;
else
client->flags &= ~I2C_CLIENT_PEC;
dev_dbg(&client->dev, "PEC: %s\n", (client->flags & I2C_CLIENT_PEC) ?
"enabled" : "disabled");
chip->is_present = true;
return 0;
}
static int sbs_read_word_data(struct i2c_client *client, u8 address)
{
struct sbs_info *chip = i2c_get_clientdata(client);
@ -579,7 +645,7 @@ static int sbs_get_property(struct power_supply *psy,
return ret;
if (psp == POWER_SUPPLY_PROP_PRESENT) {
val->intval = ret;
chip->is_present = val->intval;
sbs_update_presence(chip, ret);
return 0;
}
if (ret == 0)
@ -678,7 +744,7 @@ static int sbs_get_property(struct power_supply *psy,
if (!chip->gpio_detect &&
chip->is_present != (ret >= 0)) {
chip->is_present = (ret >= 0);
sbs_update_presence(chip, (ret >= 0));
power_supply_changed(chip->power_supply);
}
@ -709,7 +775,7 @@ static void sbs_supply_changed(struct sbs_info *chip)
ret = gpiod_get_value_cansleep(chip->gpio_detect);
if (ret < 0)
return;
chip->is_present = ret;
sbs_update_presence(chip, ret);
power_supply_changed(battery);
}