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power: supply: sbs-battery: Use gpio_desc and sleeping calls for battery detect 

Switch to using new gpio_desc interface and devm gpio get calls to
automatically manage gpio resource. Use gpiod_get_value which handles
active high / low calls.

If gpio_detect is set then force loading of the driver as it is
reasonable to assume that the battery may not be present.

Update the is_present flag immediately in the IRQ.

Remove legacy gpio specification from platform data.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
hifive-unleashed-5.1
Phil Reid 2016-09-01 15:50:52 +08:00 committed by Sebastian Reichel
parent 528e350412
commit 3b5dd3a494
2 changed files with 34 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
drivers/power/supply/sbs-battery.c
View File

@ -26,7 +26,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/stat.h>
@ -165,7 +165,7 @@ struct sbs_info {
struct power_supply *power_supply;
struct sbs_platform_data *pdata;
bool is_present;
bool gpio_detect;
struct gpio_desc *gpio_detect;
bool enable_detection;
int last_state;
int poll_time;
@ -306,13 +306,11 @@ static int sbs_get_battery_presence_and_health(
s32 ret;
struct sbs_info *chip = i2c_get_clientdata(client);
if (psp == POWER_SUPPLY_PROP_PRESENT &&
chip->gpio_detect) {
ret = gpio_get_value(chip->pdata->battery_detect);
if (ret == chip->pdata->battery_detect_present)
val->intval = 1;
else
val->intval = 0;
if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) {
ret = gpiod_get_value_cansleep(chip->gpio_detect);
if (ret < 0)
return ret;
val->intval = ret;
chip->is_present = val->intval;
return ret;
}
@ -683,7 +681,12 @@ static irqreturn_t sbs_irq(int irq, void *devid)
{
struct sbs_info *chip = devid;
struct power_supply *battery = chip->power_supply;
int ret;
ret = gpiod_get_value_cansleep(chip->gpio_detect);
if (ret < 0)
return ret;
chip->is_present = ret;
power_supply_changed(battery);
return IRQ_HANDLED;
@ -750,12 +753,11 @@ static const struct of_device_id sbs_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, sbs_dt_ids);
static struct sbs_platform_data *sbs_of_populate_pdata(
struct i2c_client *client)
static struct sbs_platform_data *sbs_of_populate_pdata(struct sbs_info *chip)
{
struct i2c_client *client = chip->client;
struct device_node *of_node = client->dev.of_node;
struct sbs_platform_data *pdata = client->dev.platform_data;
enum of_gpio_flags gpio_flags;
struct sbs_platform_data *pdata;
int rc;
u32 prop;
@ -763,22 +765,17 @@ static struct sbs_platform_data *sbs_of_populate_pdata(
if (!of_node)
return NULL;
/* if platform data is set, honor it */
if (pdata)
return pdata;
/* first make sure at least one property is set, otherwise
* it won't change behavior from running without pdata.
*/
if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
!of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
!of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
!of_get_property(of_node, "sbs,poll-retry-count", NULL))
goto of_out;
pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
GFP_KERNEL);
if (!pdata)
goto of_out;
return ERR_PTR(-ENOMEM);
rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
if (!rc)
@ -788,27 +785,14 @@ static struct sbs_platform_data *sbs_of_populate_pdata(
if (!rc)
pdata->poll_retry_count = prop;
if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
pdata->battery_detect = -1;
goto of_out;
}
pdata->battery_detect = of_get_named_gpio_flags(of_node,
"sbs,battery-detect-gpios", 0, &gpio_flags);
if (gpio_flags & OF_GPIO_ACTIVE_LOW)
pdata->battery_detect_present = 0;
else
pdata->battery_detect_present = 1;
of_out:
return pdata;
}
#else
static struct sbs_platform_data *sbs_of_populate_pdata(
struct i2c_client *client)
struct sbs_info *client)
{
return client->dev.platform_data;
return ERR_PTR(-ENOSYS);
}
#endif
@ -846,7 +830,6 @@ static int sbs_probe(struct i2c_client *client,
chip->client = client;
chip->enable_detection = false;
chip->gpio_detect = false;
psy_cfg.of_node = client->dev.of_node;
psy_cfg.drv_data = chip;
/* ignore first notification of external change, it is generated
@ -855,11 +838,20 @@ static int sbs_probe(struct i2c_client *client,
chip->ignore_changes = 1;
chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
pdata = sbs_of_populate_pdata(client);
if (!pdata)
pdata = sbs_of_populate_pdata(chip);
if (pdata) {
chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
chip->pdata = pdata;
if (IS_ERR(pdata))
return PTR_ERR(pdata);
chip->pdata = pdata;
chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
"sbs,battery-detect", GPIOD_IN);
if (IS_ERR(chip->gpio_detect)) {
dev_err(&client->dev, "Failed to get gpio: %ld\n",
PTR_ERR(chip->gpio_detect));
return PTR_ERR(chip->gpio_detect);
}
i2c_set_clientdata(client, chip);
@ -867,26 +859,9 @@ static int sbs_probe(struct i2c_client *client,
if (!chip->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);
chip->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);
chip->gpio_detect = false;
goto skip_gpio;
}
irq = gpio_to_irq(pdata->battery_detect);
irq = gpiod_to_irq(chip->gpio_detect);
if (irq <= 0) {
dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
gpio_free(pdata->battery_detect);
chip->gpio_detect = false;
goto skip_gpio;
}
@ -895,8 +870,6 @@ static int sbs_probe(struct i2c_client *client,
dev_name(&client->dev), chip);
if (rc) {
dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
gpio_free(pdata->battery_detect);
chip->gpio_detect = false;
goto skip_gpio;
}
@ -905,7 +878,7 @@ skip_gpio:
* Before we register, we might need to make sure we can actually talk
* to the battery.
*/
if (!force_load) {
if (!(force_load || chip->gpio_detect)) {
rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
if (rc < 0) {
@ -934,9 +907,6 @@ skip_gpio:
return 0;
exit_psupply:
if (chip->gpio_detect)
gpio_free(pdata->battery_detect);
return rc;
}
@ -944,9 +914,6 @@ static int sbs_remove(struct i2c_client *client)
{
struct sbs_info *chip = i2c_get_clientdata(client);
if (chip->gpio_detect)
gpio_free(chip->pdata->battery_detect);
cancel_delayed_work_sync(&chip->work);
return 0;

4
include/linux/power/sbs-battery.h
View File

@ -26,15 +26,11 @@
/**
* struct sbs_platform_data - platform data for sbs devices
* @battery_detect: GPIO which is used to detect battery presence
* @battery_detect_present: gpio state when battery is present (0 / 1)
* @i2c_retry_count: # of times to retry on i2c IO failure
* @poll_retry_count: # of times to retry looking for new status after
* external change notification
*/
struct sbs_platform_data {
int battery_detect;
int battery_detect_present;
int i2c_retry_count;
int poll_retry_count;
};