This adds smb alert support via the smbus_alert driver to generate
power_supply_changed notifications when either external power is
removed / applied or a battery inserted / removed.
Use the i2c alert callback to notify the attached battery driver that a
change has occurred.
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
drivers/power/supply/Kconfig | 3 +-
drivers/power/supply/sbs-manager.c | 129 +++++++++++++++++++++++++++++++++++--
2 files changed, 127 insertions(+), 5 deletions(-)
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index a435415..1753c6c 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -172,7 +172,8 @@ config CHARGER_SBS
config MANAGER_SBS
tristate "Smart Battery System Manager"
- depends on I2C && I2C_MUX
+ depends on I2C && I2C_MUX && GPIOLIB
+ select I2C_SMBUS
help
Say Y here to include support for Smart Battery System Manager
ICs. The driver reports online and charging status via sysfs.
diff --git a/drivers/power/supply/sbs-manager.c b/drivers/power/supply/sbs-manager.c
index 8842f6e..6c34157 100644
--- a/drivers/power/supply/sbs-manager.c
+++ b/drivers/power/supply/sbs-manager.c
@@ -16,11 +16,13 @@
* published by the Free Software Foundation.
*/
+#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/of_device.h>
#include <linux/power_supply.h>
+#include <linux/property.h>
#define SBSM_MAX_BATS 4
#define SBSM_RETRY_CNT 3
@@ -31,6 +33,8 @@
#define SBSM_CMD_BATSYSINFO 0x04
#define SBSM_CMD_LTC 0x3c
+#define SBSM_BIT_AC_PRESENT BIT(0)
+
struct sbsm_data {
struct i2c_client *client;
struct i2c_mux_core *muxc;
@@ -38,7 +42,12 @@ struct sbsm_data {
struct power_supply *psy;
u8 cur_chan; /* currently selected channel */
+ struct gpio_chip chip;
bool is_ltc1760; /* special capabilities */
+
+ unsigned int supported_bats;
+ unsigned int last_state;
+ unsigned int last_state_cont;
};
static enum power_supply_property sbsm_props[] = {
@@ -181,6 +190,115 @@ static int sbsm_select(struct i2c_mux_core *muxc, u32 chan)
return ret;
}
+static int sbsm_gpio_get_value(struct gpio_chip *gc, unsigned off)
+{
+ struct sbsm_data *data = gpiochip_get_data(gc);
+ int ret;
+
+ ret = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATE);
+ if (ret < 0)
+ return ret;
+
+ return ret & BIT(off);
+}
+
+/*
+ * This needs to be defined or the GPIO lib fails to register the pin.
+ * But the 'gpio' is always an input.
+ */
+static int sbsm_gpio_direction_input(struct gpio_chip *gc, unsigned off)
+{
+ return 0;
+}
+
+static int sbsm_do_alert(struct device *dev, void *d)
+{
+ struct i2c_client *client = i2c_verify_client(dev);
+ struct i2c_driver *driver;
+
+ if (!client || client->addr != 0x0b)
+ return 0;
+
+ device_lock(dev);
+ if (client->dev.driver) {
+ driver = to_i2c_driver(client->dev.driver);
+ if (driver->alert)
+ driver->alert(client, I2C_PROTOCOL_SMBUS_ALERT, 0);
+ else
+ dev_warn(&client->dev, "no driver alert()!\n");
+ } else
+ dev_dbg(&client->dev, "alert with no driver\n");
+ device_unlock(dev);
+
+ return -EBUSY;
+}
+
+static void sbsm_alert(struct i2c_client *client, enum i2c_alert_protocol prot,
+ unsigned int d)
+{
+ struct sbsm_data *sbsm = i2c_get_clientdata(client);
+
+ int ret, i, irq_bat = 0;
+
+ ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATE);
+ if (ret >= 0)
+ irq_bat = ret ^ sbsm->last_state;
+ sbsm->last_state = ret;
+
+ ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATECONT);
+ if ((ret >= 0) &&
+ ((ret ^ sbsm->last_state_cont) & SBSM_BIT_AC_PRESENT)) {
+ irq_bat |= sbsm->supported_bats;
+ power_supply_changed(sbsm->psy);
+ }
+ sbsm->last_state_cont = ret;
+
+ for (i = 0; i < SBSM_MAX_BATS; i++) {
+ if (irq_bat & BIT(i)) {
+ device_for_each_child(&sbsm->muxc->adapter[i]->dev,
+ NULL, sbsm_do_alert);
+ }
+ }
+}
+
+static int sbsm_gpio_setup(struct sbsm_data *data)
+{
+ struct gpio_chip *gc = &data->chip;
+ struct i2c_client *client = data->client;
+ struct device *dev = &client->dev;
+ int ret;
+
+ if (!device_property_present(dev, "gpio-controller"))
+ return 0;
+
+ ret = sbsm_read_word(client, SBSM_CMD_BATSYSSTATE);
+ if (ret < 0)
+ return ret;
+ data->last_state = ret;
+
+ ret = sbsm_read_word(client, SBSM_CMD_BATSYSSTATECONT);
+ if (ret < 0)
+ return ret;
+ data->last_state_cont = ret;
+
+ gc->get = sbsm_gpio_get_value;
+ gc->direction_input = sbsm_gpio_direction_input;
+ gc->can_sleep = true;
+ gc->base = -1;
+ gc->ngpio = SBSM_MAX_BATS;
+ gc->label = client->name;
+ gc->parent = dev;
+ gc->owner = THIS_MODULE;
+
+ ret = devm_gpiochip_add_data(dev, gc, data);
+ if (ret) {
+ dev_err(dev, "devm_gpiochip_add_data failed: %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
static const struct of_device_id sbsm_dt_ids[] = {
{ .compatible = "sbs,sbs-manager" },
{ .compatible = "lltc,ltc1760" },
@@ -204,7 +322,7 @@ static int sbsm_probe(struct i2c_client *client,
struct device *dev = &client->dev;
struct power_supply_desc *psy_desc;
struct power_supply_config psy_cfg = {};
- int ret = 0, i, supported_bats;
+ int ret = 0, i;
/* Device listens only at address 0x0a */
if (client->addr != 0x0a)
@@ -225,8 +343,7 @@ static int sbsm_probe(struct i2c_client *client,
ret = sbsm_read_word(client, SBSM_CMD_BATSYSINFO);
if (ret < 0)
return ret;
- supported_bats = ret & 0xf;
-
+ data->supported_bats = ret & 0xf;
data->muxc = i2c_mux_alloc(adapter, dev, SBSM_MAX_BATS, 0,
I2C_MUX_LOCKED, &sbsm_select, NULL);
if (!data->muxc) {
@@ -238,7 +355,7 @@ static int sbsm_probe(struct i2c_client *client,
/* register muxed i2c channels. One for each supported battery */
for (i = 0; i < SBSM_MAX_BATS; ++i) {
- if (supported_bats & BIT(i)) {
+ if (data->supported_bats & BIT(i)) {
ret = i2c_mux_add_adapter(data->muxc, 0, i + 1, 0);
if (ret) {
dev_err(dev,
@@ -263,6 +380,9 @@ static int sbsm_probe(struct i2c_client *client,
ret = -ENOMEM;
goto err_psy;
}
+ ret = sbsm_gpio_setup(data);
+ if (ret < 0)
+ goto err_psy;
psy_cfg.drv_data = data;
psy_cfg.of_node = dev->of_node;
@@ -308,6 +428,7 @@ static int sbsm_remove(struct i2c_client *client)
},
.probe = sbsm_probe,
.remove = sbsm_remove,
+ .alert = sbsm_alert,
.id_table = sbsm_ids
};
module_i2c_driver(sbsm_driver);
--
1.8.3.1
--
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