diff options
Diffstat (limited to 'drivers/power/supply/sbs-manager.c')
| -rw-r--r-- | drivers/power/supply/sbs-manager.c | 129 |
1 files changed, 125 insertions, 4 deletions
diff --git a/drivers/power/supply/sbs-manager.c b/drivers/power/supply/sbs-manager.c index 47c09a178411..3e3ad09c5f11 100644 --- a/drivers/power/supply/sbs-manager.c +++ b/drivers/power/supply/sbs-manager.c @@ -16,10 +16,12 @@ * 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/power_supply.h> +#include <linux/property.h> #define SBSM_MAX_BATS 4 #define SBSM_RETRY_CNT 3 @@ -43,7 +45,12 @@ 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[] = { @@ -186,6 +193,117 @@ 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, state = 0; + + ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATE); + if (ret >= 0) { + irq_bat = ret ^ sbsm->last_state; + sbsm->last_state = ret; + 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 & state; + 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 power_supply_desc sbsm_default_psy_desc = { .type = POWER_SUPPLY_TYPE_MAINS, .properties = sbsm_props, @@ -203,7 +321,7 @@ 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) @@ -224,8 +342,7 @@ static int sbsm_probe(struct i2c_client *client, ret = sbsm_read_word(client, SBSM_CMD_BATSYSINFO); if (ret < 0) return ret; - supported_bats = ret & SBSM_MASK_BAT_SUPPORTED; - + data->supported_bats = ret & SBSM_MASK_BAT_SUPPORTED; data->muxc = i2c_mux_alloc(adapter, dev, SBSM_MAX_BATS, 0, I2C_MUX_LOCKED, &sbsm_select, NULL); if (!data->muxc) { @@ -237,7 +354,7 @@ 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) break; @@ -262,6 +379,9 @@ 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; @@ -314,6 +434,7 @@ static struct i2c_driver sbsm_driver = { }, .probe = sbsm_probe, .remove = sbsm_remove, + .alert = sbsm_alert, .id_table = sbsm_ids }; module_i2c_driver(sbsm_driver); |