This adds irq support via the smbus_alert driver to generate power_supply_changed notifications when either external power is removed / applied or a battery inserted / removed. Uuse 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/sbs-manager.c | 134 ++++++++++++++++++++++++++++++++++++- 1 file changed, 131 insertions(+), 3 deletions(-) diff --git a/drivers/power/supply/sbs-manager.c b/drivers/power/supply/sbs-manager.c index e3debd7..9b92b40 100644 --- a/drivers/power/supply/sbs-manager.c +++ b/drivers/power/supply/sbs-manager.c @@ -19,6 +19,7 @@ #include <linux/module.h> #include <linux/i2c.h> #include <linux/i2c-mux.h> +#include <linux/gpio.h> #include <linux/power_supply.h> #define SBSM_MAX_BATS 4 @@ -30,14 +31,22 @@ #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; struct power_supply *psy; + struct gpio_chip chip; + int cur_chan; /* currently selected channel */ 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[] = { @@ -184,6 +193,121 @@ 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; + + /* + * Drivers should either disable alerts, or provide at least + * a minimal handler. Lock so the driver won't change. + */ + 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); + + /* Stop iterating after we find the device */ + return -EBUSY; +} + +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, 0, + 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; + struct device_node *of_node = client->dev.of_node; + int ret; + + if (!of_get_property(of_node, "gpio-controller", NULL)) + 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; +} + #if defined(CONFIG_OF) #include <linux/of_device.h> @@ -214,7 +338,7 @@ 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) @@ -235,7 +359,7 @@ static int sbsm_probe(struct i2c_client *client, ret = sbsm_read_word(client, SBSM_CMD_BATSYSINFO); if (ret < 0) return ret; - supported_bats = le16_to_cpu(ret) & 0xf; + data->supported_bats = le16_to_cpu(ret) & 0xf; data->muxc = i2c_mux_alloc(adapter, dev, SBSM_MAX_BATS, 0, I2C_MUX_LOCKED, &sbsm_select, NULL); @@ -247,7 +371,7 @@ 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 ((1 << i) & supported_bats) { + if ((1 << i) & data->supported_bats) { ret = i2c_mux_add_adapter(data->muxc, 0, i + 1, 0); if (ret) { dev_err(dev, @@ -272,6 +396,9 @@ 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; data->psy = devm_power_supply_register(dev, psy_desc, &psy_cfg); @@ -314,6 +441,7 @@ static struct i2c_driver sbsm_driver = { }, .probe = sbsm_probe, .remove = sbsm_remove, + .alert = sbsm_alert, .id_table = sbsm_ids }; module_i2c_driver(sbsm_driver); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html