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path: root/drivers/power/bq20z75.c
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Diffstat (limited to 'drivers/power/bq20z75.c')
-rw-r--r--drivers/power/bq20z75.c310
1 files changed, 263 insertions, 47 deletions
diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c
index 492da27e1a47..506585e31a5b 100644
--- a/drivers/power/bq20z75.c
+++ b/drivers/power/bq20z75.c
@@ -25,6 +25,10 @@
#include <linux/power_supply.h>
#include <linux/i2c.h>
#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+
+#include <linux/power/bq20z75.h>
enum {
REG_MANUFACTURER_DATA,
@@ -38,11 +42,22 @@ enum {
REG_CYCLE_COUNT,
REG_SERIAL_NUMBER,
REG_REMAINING_CAPACITY,
+ REG_REMAINING_CAPACITY_CHARGE,
REG_FULL_CHARGE_CAPACITY,
+ REG_FULL_CHARGE_CAPACITY_CHARGE,
REG_DESIGN_CAPACITY,
+ REG_DESIGN_CAPACITY_CHARGE,
REG_DESIGN_VOLTAGE,
};
+/* Battery Mode defines */
+#define BATTERY_MODE_OFFSET 0x03
+#define BATTERY_MODE_MASK 0x8000
+enum bq20z75_battery_mode {
+ BATTERY_MODE_AMPS,
+ BATTERY_MODE_WATTS
+};
+
/* manufacturer access defines */
#define MANUFACTURER_ACCESS_STATUS 0x0006
#define MANUFACTURER_ACCESS_SLEEP 0x0011
@@ -78,8 +93,12 @@ static const struct bq20z75_device_data {
BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
[REG_REMAINING_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
+ [REG_REMAINING_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
[REG_FULL_CHARGE_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
+ [REG_FULL_CHARGE_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
[REG_TIME_TO_EMPTY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
65535),
@@ -93,6 +112,9 @@ static const struct bq20z75_device_data {
[REG_DESIGN_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
65535),
+ [REG_DESIGN_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
+ 65535),
[REG_DESIGN_VOLTAGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
65535),
@@ -117,39 +139,72 @@ static enum power_supply_property bq20z75_properties[] = {
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
};
struct bq20z75_info {
- struct i2c_client *client;
- struct power_supply power_supply;
+ struct i2c_client *client;
+ struct power_supply power_supply;
+ struct bq20z75_platform_data *pdata;
+ bool is_present;
+ bool gpio_detect;
+ bool enable_detection;
+ int irq;
};
static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
{
- s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
+
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_read_word_data(client, address);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
- ret = i2c_smbus_read_word_data(client, address);
if (ret < 0) {
- dev_err(&client->dev,
+ dev_dbg(&client->dev,
"%s: i2c read at address 0x%x failed\n",
__func__, address);
return ret;
}
+
return le16_to_cpu(ret);
}
static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
u16 value)
{
- s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
+
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_write_word_data(client, address,
+ le16_to_cpu(value));
+ if (ret >= 0)
+ break;
+ retries--;
+ }
- ret = i2c_smbus_write_word_data(client, address, le16_to_cpu(value));
if (ret < 0) {
- dev_err(&client->dev,
+ dev_dbg(&client->dev,
"%s: i2c write to address 0x%x failed\n",
__func__, address);
return ret;
}
+
return 0;
}
@@ -158,6 +213,19 @@ static int bq20z75_get_battery_presence_and_health(
union power_supply_propval *val)
{
s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+
+ if (psp == POWER_SUPPLY_PROP_PRESENT &&
+ bq20z75_device->gpio_detect) {
+ ret = gpio_get_value(
+ bq20z75_device->pdata->battery_detect);
+ if (ret == bq20z75_device->pdata->battery_detect_present)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ bq20z75_device->is_present = val->intval;
+ return ret;
+ }
/* Write to ManufacturerAccess with
* ManufacturerAccess command and then
@@ -165,9 +233,11 @@ static int bq20z75_get_battery_presence_and_health(
ret = bq20z75_write_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_STATUS);
- if (ret < 0)
+ if (ret < 0) {
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 0; /* battery removed */
return ret;
-
+ }
ret = bq20z75_read_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr);
@@ -248,30 +318,39 @@ static void bq20z75_unit_adjustment(struct i2c_client *client,
{
#define BASE_UNIT_CONVERSION 1000
#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
-#define TIME_UNIT_CONVERSION 600
-#define TEMP_KELVIN_TO_CELCIUS 2731
+#define TIME_UNIT_CONVERSION 60
+#define TEMP_KELVIN_TO_CELSIUS 2731
switch (psp) {
case POWER_SUPPLY_PROP_ENERGY_NOW:
case POWER_SUPPLY_PROP_ENERGY_FULL:
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ /* bq20z75 provides energy in units of 10mWh.
+ * Convert to µWh
+ */
val->intval *= BATTERY_MODE_CAP_MULT_WATT;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval *= BASE_UNIT_CONVERSION;
break;
case POWER_SUPPLY_PROP_TEMP:
- /* bq20z75 provides battery tempreture in 0.1°K
- * so convert it to 0.1°C */
- val->intval -= TEMP_KELVIN_TO_CELCIUS;
- val->intval *= 10;
+ /* bq20z75 provides battery temperature in 0.1K
+ * so convert it to 0.1°C
+ */
+ val->intval -= TEMP_KELVIN_TO_CELSIUS;
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ /* bq20z75 provides time to empty and time to full in minutes.
+ * Convert to seconds
+ */
val->intval *= TIME_UNIT_CONVERSION;
break;
@@ -281,11 +360,44 @@ static void bq20z75_unit_adjustment(struct i2c_client *client,
}
}
+static enum bq20z75_battery_mode
+bq20z75_set_battery_mode(struct i2c_client *client,
+ enum bq20z75_battery_mode mode)
+{
+ int ret, original_val;
+
+ original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
+ if (original_val < 0)
+ return original_val;
+
+ if ((original_val & BATTERY_MODE_MASK) == mode)
+ return mode;
+
+ if (mode == BATTERY_MODE_AMPS)
+ ret = original_val & ~BATTERY_MODE_MASK;
+ else
+ ret = original_val | BATTERY_MODE_MASK;
+
+ ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
+ if (ret < 0)
+ return ret;
+
+ return original_val & BATTERY_MODE_MASK;
+}
+
static int bq20z75_get_battery_capacity(struct i2c_client *client,
int reg_offset, enum power_supply_property psp,
union power_supply_propval *val)
{
s32 ret;
+ enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
+
+ if (power_supply_is_amp_property(psp))
+ mode = BATTERY_MODE_AMPS;
+
+ mode = bq20z75_set_battery_mode(client, mode);
+ if (mode < 0)
+ return mode;
ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
if (ret < 0)
@@ -298,6 +410,10 @@ static int bq20z75_get_battery_capacity(struct i2c_client *client,
} else
val->intval = ret;
+ ret = bq20z75_set_battery_mode(client, mode);
+ if (ret < 0)
+ return ret;
+
return 0;
}
@@ -318,12 +434,25 @@ static int bq20z75_get_battery_serial_number(struct i2c_client *client,
return 0;
}
+static int bq20z75_get_property_index(struct i2c_client *client,
+ enum power_supply_property psp)
+{
+ int count;
+ for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
+ if (psp == bq20z75_data[count].psp)
+ return count;
+
+ dev_warn(&client->dev,
+ "%s: Invalid Property - %d\n", __func__, psp);
+
+ return -EINVAL;
+}
+
static int bq20z75_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
- int count;
- int ret;
+ int ret = 0;
struct bq20z75_info *bq20z75_device = container_of(psy,
struct bq20z75_info, power_supply);
struct i2c_client *client = bq20z75_device->client;
@@ -332,8 +461,8 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_PRESENT:
case POWER_SUPPLY_PROP_HEALTH:
ret = bq20z75_get_battery_presence_and_health(client, psp, val);
- if (ret)
- return ret;
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ return 0;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
@@ -343,22 +472,19 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_ENERGY_NOW:
case POWER_SUPPLY_PROP_ENERGY_FULL:
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
case POWER_SUPPLY_PROP_CAPACITY:
- for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) {
- if (psp == bq20z75_data[count].psp)
- break;
- }
-
- ret = bq20z75_get_battery_capacity(client, count, psp, val);
- if (ret)
- return ret;
+ ret = bq20z75_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+ ret = bq20z75_get_battery_capacity(client, ret, psp, val);
break;
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
ret = bq20z75_get_battery_serial_number(client, val);
- if (ret)
- return ret;
break;
case POWER_SUPPLY_PROP_STATUS:
@@ -369,15 +495,11 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
- for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) {
- if (psp == bq20z75_data[count].psp)
- break;
- }
-
- ret = bq20z75_get_battery_property(client, count, psp, val);
- if (ret)
- return ret;
+ ret = bq20z75_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+ ret = bq20z75_get_battery_property(client, ret, psp, val);
break;
default:
@@ -386,26 +508,58 @@ static int bq20z75_get_property(struct power_supply *psy,
return -EINVAL;
}
- /* Convert units to match requirements for power supply class */
- bq20z75_unit_adjustment(client, psp, val);
+ if (!bq20z75_device->enable_detection)
+ goto done;
+
+ if (!bq20z75_device->gpio_detect &&
+ bq20z75_device->is_present != (ret >= 0)) {
+ bq20z75_device->is_present = (ret >= 0);
+ power_supply_changed(&bq20z75_device->power_supply);
+ }
+
+done:
+ if (!ret) {
+ /* Convert units to match requirements for power supply class */
+ bq20z75_unit_adjustment(client, psp, val);
+ }
dev_dbg(&client->dev,
- "%s: property = %d, value = %d\n", __func__, psp, val->intval);
+ "%s: property = %d, value = %x\n", __func__, psp, val->intval);
+
+ if (ret && bq20z75_device->is_present)
+ return ret;
+
+ /* battery not present, so return NODATA for properties */
+ if (ret)
+ return -ENODATA;
return 0;
}
-static int bq20z75_probe(struct i2c_client *client,
+static irqreturn_t bq20z75_irq(int irq, void *devid)
+{
+ struct power_supply *battery = devid;
+
+ power_supply_changed(battery);
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit bq20z75_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bq20z75_info *bq20z75_device;
+ struct bq20z75_platform_data *pdata = client->dev.platform_data;
int rc;
+ int irq;
bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
if (!bq20z75_device)
return -ENOMEM;
bq20z75_device->client = client;
+ bq20z75_device->enable_detection = false;
+ bq20z75_device->gpio_detect = false;
bq20z75_device->power_supply.name = "battery";
bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
bq20z75_device->power_supply.properties = bq20z75_properties;
@@ -413,26 +567,86 @@ static int bq20z75_probe(struct i2c_client *client,
ARRAY_SIZE(bq20z75_properties);
bq20z75_device->power_supply.get_property = bq20z75_get_property;
+ if (pdata) {
+ bq20z75_device->gpio_detect =
+ gpio_is_valid(pdata->battery_detect);
+ bq20z75_device->pdata = pdata;
+ }
+
i2c_set_clientdata(client, bq20z75_device);
+ if (!bq20z75_device->gpio_detect)
+ goto skip_gpio;
+
+ rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ rc = gpio_direction_input(pdata->battery_detect);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ irq = gpio_to_irq(pdata->battery_detect);
+ if (irq <= 0) {
+ dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ rc = request_irq(irq, bq20z75_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ dev_name(&client->dev), &bq20z75_device->power_supply);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ bq20z75_device->irq = irq;
+
+skip_gpio:
+
rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
if (rc) {
dev_err(&client->dev,
"%s: Failed to register power supply\n", __func__);
- kfree(bq20z75_device);
- return rc;
+ goto exit_psupply;
}
dev_info(&client->dev,
"%s: battery gas gauge device registered\n", client->name);
return 0;
+
+exit_psupply:
+ if (bq20z75_device->irq)
+ free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
+ if (bq20z75_device->gpio_detect)
+ gpio_free(pdata->battery_detect);
+
+ kfree(bq20z75_device);
+
+ return rc;
}
-static int bq20z75_remove(struct i2c_client *client)
+static int __devexit bq20z75_remove(struct i2c_client *client)
{
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ if (bq20z75_device->irq)
+ free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
+ if (bq20z75_device->gpio_detect)
+ gpio_free(bq20z75_device->pdata->battery_detect);
+
power_supply_unregister(&bq20z75_device->power_supply);
kfree(bq20z75_device);
bq20z75_device = NULL;
@@ -444,13 +658,14 @@ static int bq20z75_remove(struct i2c_client *client)
static int bq20z75_suspend(struct i2c_client *client,
pm_message_t state)
{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
s32 ret;
/* write to manufacturer access with sleep command */
ret = bq20z75_write_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_SLEEP);
- if (ret < 0)
+ if (bq20z75_device->is_present && ret < 0)
return ret;
return 0;
@@ -465,10 +680,11 @@ static const struct i2c_device_id bq20z75_id[] = {
{ "bq20z75", 0 },
{}
};
+MODULE_DEVICE_TABLE(i2c, bq20z75_id);
static struct i2c_driver bq20z75_battery_driver = {
.probe = bq20z75_probe,
- .remove = bq20z75_remove,
+ .remove = __devexit_p(bq20z75_remove),
.suspend = bq20z75_suspend,
.resume = bq20z75_resume,
.id_table = bq20z75_id,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.