Hi, On Thu, Jun 15, 2017 at 09:59:36PM +0800, Phil Reid wrote: > From: Karl-Heinz Schneider <karl-heinz@xxxxxxxxxxxxxxxxx> > > This patch adds support for Smart Battery System Manager. > A SBSM is a device listening at I2C/SMBus address 0x0a and is capable of > communicating up to four I2C smart battery devices. All smart battery > devices are listening at address 0x0b, so the SBSM muliplexes between > them. The driver makes use of the I2C-Mux framework to allow smart > batteries to be bound via device tree, i.e. the sbs-battery driver. > > Via sysfs interface the online state and charge type are presented. If > the driver is bound as ltc1760 (an implementation of a Dual Smart Battery > System Manager) the charge type can also be changed from trickle to fast. > > Tested-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx> > Reviewed-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx> > Signed-off-by: Karl-Heinz Schneider <karl-heinz@xxxxxxxxxxxxxxxxx> > Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx> > --- > drivers/power/supply/Kconfig | 13 ++ > drivers/power/supply/Makefile | 1 + > drivers/power/supply/sbs-manager.c | 323 +++++++++++++++++++++++++++++++++++++ > 3 files changed, 337 insertions(+) > create mode 100644 drivers/power/supply/sbs-manager.c Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx> -- Sebastian > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig > index da54ac8..a435415 100644 > --- a/drivers/power/supply/Kconfig > +++ b/drivers/power/supply/Kconfig > @@ -170,6 +170,19 @@ config CHARGER_SBS > help > Say Y to include support for SBS compilant battery chargers. > > +config MANAGER_SBS > + tristate "Smart Battery System Manager" > + depends on I2C && I2C_MUX > + help > + Say Y here to include support for Smart Battery System Manager > + ICs. The driver reports online and charging status via sysfs. > + It presents itself also as I2C mux which allows to bind > + smart battery driver to its ports. > + Supported is for example LTC1760. > + > + This driver can also be built as a module. If so, the module will be > + called sbs-manager. > + > config BATTERY_BQ27XXX > tristate "BQ27xxx battery driver" > help > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile > index 3789a2c..350c0bb 100644 > --- a/drivers/power/supply/Makefile > +++ b/drivers/power/supply/Makefile > @@ -33,6 +33,7 @@ obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o > obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o > obj-$(CONFIG_BATTERY_SBS) += sbs-battery.o > obj-$(CONFIG_CHARGER_SBS) += sbs-charger.o > +obj-$(CONFIG_MANAGER_SBS) += sbs-manager.o > obj-$(CONFIG_BATTERY_BQ27XXX) += bq27xxx_battery.o > obj-$(CONFIG_BATTERY_BQ27XXX_I2C) += bq27xxx_battery_i2c.o > obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o > diff --git a/drivers/power/supply/sbs-manager.c b/drivers/power/supply/sbs-manager.c > new file mode 100644 > index 0000000..47c09a1 > --- /dev/null > +++ b/drivers/power/supply/sbs-manager.c > @@ -0,0 +1,323 @@ > +/* > + * Driver for SBS compliant Smart Battery System Managers > + * > + * The device communicates via i2c at address 0x0a and multiplexes access to up > + * to four smart batteries at address 0x0b. > + * > + * Via sysfs interface the online state and charge type are presented. > + * > + * Datasheet SBSM: http://sbs-forum.org/specs/sbsm100b.pdf > + * Datasheet LTC1760: http://cds.linear.com/docs/en/datasheet/1760fb.pdf > + * > + * Karl-Heinz Schneider <karl-heinz@xxxxxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + */ > + > +#include <linux/module.h> > +#include <linux/i2c.h> > +#include <linux/i2c-mux.h> > +#include <linux/power_supply.h> > + > +#define SBSM_MAX_BATS 4 > +#define SBSM_RETRY_CNT 3 > + > +/* registers addresses */ > +#define SBSM_CMD_BATSYSSTATE 0x01 > +#define SBSM_CMD_BATSYSSTATECONT 0x02 > +#define SBSM_CMD_BATSYSINFO 0x04 > +#define SBSM_CMD_LTC 0x3c > + > +#define SBSM_MASK_BAT_SUPPORTED GENMASK(3, 0) > +#define SBSM_MASK_CHARGE_BAT GENMASK(7, 4) > +#define SBSM_BIT_AC_PRESENT BIT(0) > +#define SBSM_BIT_TURBO BIT(7) > + > +#define SBSM_SMB_BAT_OFFSET 11 > +struct sbsm_data { > + struct i2c_client *client; > + struct i2c_mux_core *muxc; > + > + struct power_supply *psy; > + > + u8 cur_chan; /* currently selected channel */ > + bool is_ltc1760; /* special capabilities */ > +}; > + > +static enum power_supply_property sbsm_props[] = { > + POWER_SUPPLY_PROP_ONLINE, > + POWER_SUPPLY_PROP_CHARGE_TYPE, > +}; > + > +static int sbsm_read_word(struct i2c_client *client, u8 address) > +{ > + int reg, retries; > + > + for (retries = SBSM_RETRY_CNT; retries > 0; retries--) { > + reg = i2c_smbus_read_word_data(client, address); > + if (reg >= 0) > + break; > + } > + > + if (reg < 0) { > + dev_err(&client->dev, "failed to read register 0x%02x\n", > + address); > + } > + > + return reg; > +} > + > +static int sbsm_write_word(struct i2c_client *client, u8 address, u16 word) > +{ > + int ret, retries; > + > + for (retries = SBSM_RETRY_CNT; retries > 0; retries--) { > + ret = i2c_smbus_write_word_data(client, address, word); > + if (ret >= 0) > + break; > + } > + if (ret < 0) > + dev_err(&client->dev, "failed to write to register 0x%02x\n", > + address); > + > + return ret; > +} > + > +static int sbsm_get_property(struct power_supply *psy, > + enum power_supply_property psp, > + union power_supply_propval *val) > +{ > + struct sbsm_data *data = power_supply_get_drvdata(psy); > + int regval = 0; > + > + switch (psp) { > + case POWER_SUPPLY_PROP_ONLINE: > + regval = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATECONT); > + if (regval < 0) > + return regval; > + val->intval = !!(regval & SBSM_BIT_AC_PRESENT); > + break; > + > + case POWER_SUPPLY_PROP_CHARGE_TYPE: > + regval = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATE); > + if (regval < 0) > + return regval; > + > + if ((regval & SBSM_MASK_CHARGE_BAT) == 0) { > + val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; > + return 0; > + } > + val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; > + > + if (data->is_ltc1760) { > + /* charge mode fast if turbo is active */ > + regval = sbsm_read_word(data->client, SBSM_CMD_LTC); > + if (regval < 0) > + return regval; > + else if (regval & SBSM_BIT_TURBO) > + val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; > + } > + break; > + > + default: > + return -EINVAL; > + } > + > + return 0; > +} > + > +static int sbsm_prop_is_writeable(struct power_supply *psy, > + enum power_supply_property psp) > +{ > + struct sbsm_data *data = power_supply_get_drvdata(psy); > + > + return (psp == POWER_SUPPLY_PROP_CHARGE_TYPE) && data->is_ltc1760; > +} > + > +static int sbsm_set_property(struct power_supply *psy, > + enum power_supply_property psp, > + const union power_supply_propval *val) > +{ > + struct sbsm_data *data = power_supply_get_drvdata(psy); > + int ret = -EINVAL; > + u16 regval; > + > + switch (psp) { > + case POWER_SUPPLY_PROP_CHARGE_TYPE: > + /* write 1 to TURBO if type fast is given */ > + if (!data->is_ltc1760) > + break; > + regval = val->intval == > + POWER_SUPPLY_CHARGE_TYPE_FAST ? SBSM_BIT_TURBO : 0; > + ret = sbsm_write_word(data->client, SBSM_CMD_LTC, regval); > + break; > + > + default: > + break; > + } > + > + return ret; > +} > + > +/* > + * Switch to battery > + * Parameter chan is directly the content of SMB_BAT* nibble > + */ > +static int sbsm_select(struct i2c_mux_core *muxc, u32 chan) > +{ > + struct sbsm_data *data = i2c_mux_priv(muxc); > + struct device *dev = &data->client->dev; > + int ret = 0; > + u16 reg; > + > + if (data->cur_chan == chan) > + return ret; > + > + /* chan goes from 1 ... 4 */ > + reg = 1 << BIT(SBSM_SMB_BAT_OFFSET + chan); > + ret = sbsm_write_word(data->client, SBSM_CMD_BATSYSSTATE, reg); > + if (ret) > + dev_err(dev, "Failed to select channel %i\n", chan); > + else > + data->cur_chan = chan; > + > + return ret; > +} > + > +static const struct power_supply_desc sbsm_default_psy_desc = { > + .type = POWER_SUPPLY_TYPE_MAINS, > + .properties = sbsm_props, > + .num_properties = ARRAY_SIZE(sbsm_props), > + .get_property = &sbsm_get_property, > + .set_property = &sbsm_set_property, > + .property_is_writeable = &sbsm_prop_is_writeable, > +}; > + > +static int sbsm_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); > + struct sbsm_data *data; > + struct device *dev = &client->dev; > + struct power_supply_desc *psy_desc; > + struct power_supply_config psy_cfg = {}; > + int ret = 0, i, supported_bats; > + > + /* Device listens only at address 0x0a */ > + if (client->addr != 0x0a) > + return -EINVAL; > + > + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) > + return -EPFNOSUPPORT; > + > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + i2c_set_clientdata(client, data); > + > + data->client = client; > + data->is_ltc1760 = !!strstr(id->name, "ltc1760"); > + > + ret = sbsm_read_word(client, SBSM_CMD_BATSYSINFO); > + if (ret < 0) > + return ret; > + 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) { > + dev_err(dev, "failed to alloc i2c mux\n"); > + ret = -ENOMEM; > + goto err_mux_alloc; > + } > + data->muxc->priv = data; > + > + /* register muxed i2c channels. One for each supported battery */ > + for (i = 0; i < SBSM_MAX_BATS; ++i) { > + if (supported_bats & BIT(i)) { > + ret = i2c_mux_add_adapter(data->muxc, 0, i + 1, 0); > + if (ret) > + break; > + } > + } > + if (ret) { > + dev_err(dev, "failed to register i2c mux channel %d\n", i + 1); > + goto err_mux_register; > + } > + > + psy_desc = devm_kmemdup(dev, &sbsm_default_psy_desc, > + sizeof(struct power_supply_desc), > + GFP_KERNEL); > + if (!psy_desc) { > + ret = -ENOMEM; > + goto err_psy; > + } > + > + psy_desc->name = devm_kasprintf(dev, GFP_KERNEL, "sbsm-%s", > + dev_name(&client->dev)); > + if (!psy_desc->name) { > + ret = -ENOMEM; > + goto err_psy; > + } > + > + psy_cfg.drv_data = data; > + psy_cfg.of_node = dev->of_node; > + data->psy = devm_power_supply_register(dev, psy_desc, &psy_cfg); > + if (IS_ERR(data->psy)) { > + ret = PTR_ERR(data->psy); > + dev_err(dev, "failed to register power supply %s\n", > + psy_desc->name); > + goto err_psy; > + } > + > + return 0; > + > +err_psy: > +err_mux_register: > + i2c_mux_del_adapters(data->muxc); > + > +err_mux_alloc: > + return ret; > +} > + > +static int sbsm_remove(struct i2c_client *client) > +{ > + struct sbsm_data *data = i2c_get_clientdata(client); > + > + i2c_mux_del_adapters(data->muxc); > + return 0; > +} > + > +static const struct i2c_device_id sbsm_ids[] = { > + { "sbs-manager", 0 }, > + { "ltc1760", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, sbsm_ids); > + > +#ifdef CONFIG_OF > +static const struct of_device_id sbsm_dt_ids[] = { > + { .compatible = "sbs,sbs-manager" }, > + { .compatible = "lltc,ltc1760" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, sbsm_dt_ids); > +#endif > + > +static struct i2c_driver sbsm_driver = { > + .driver = { > + .name = "sbsm", > + .of_match_table = of_match_ptr(sbsm_dt_ids), > + }, > + .probe = sbsm_probe, > + .remove = sbsm_remove, > + .id_table = sbsm_ids > +}; > +module_i2c_driver(sbsm_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Karl-Heinz Schneider <karl-heinz@xxxxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("SBSM Smart Battery System Manager"); > -- > 1.8.3.1 >
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