1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for SBS compliant Smart Battery System Managers
10  * Datasheet SBSM:    http://sbs-forum.org/specs/sbsm100b.pdf
13  * Karl-Heinz Schneider <karl-heinz@schneider-inet.de>
19 #include <linux/i2c-mux.h>
62 	for (retries = SBSM_RETRY_CNT; retries > 0; retries--) {  in sbsm_read_word()
69 		dev_err(&client->dev, "failed to read register 0x%02x\n",  in sbsm_read_word()
80 	for (retries = SBSM_RETRY_CNT; retries > 0; retries--) {  in sbsm_write_word()
86 		dev_err(&client->dev, "failed to write to register 0x%02x\n",  in sbsm_write_word()
101 		regval = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATECONT);  in sbsm_get_property()
104 		val->intval = !!(regval & SBSM_BIT_AC_PRESENT);  in sbsm_get_property()
108 		regval = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATE);  in sbsm_get_property()
113 			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;  in sbsm_get_property()
116 		val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;  in sbsm_get_property()
118 		if (data->is_ltc1760) {  in sbsm_get_property()
120 			regval = sbsm_read_word(data->client, SBSM_CMD_LTC);  in sbsm_get_property()
124 				val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;  in sbsm_get_property()
129 		return -EINVAL;  in sbsm_get_property()
140 	return (psp == POWER_SUPPLY_PROP_CHARGE_TYPE) && data->is_ltc1760;  in sbsm_prop_is_writeable()
148 	int ret = -EINVAL;  in sbsm_set_property()
154 		if (!data->is_ltc1760)  in sbsm_set_property()
156 		regval = val->intval ==  in sbsm_set_property()
158 		ret = sbsm_write_word(data->client, SBSM_CMD_LTC, regval);  in sbsm_set_property()
169  * Switch to battery
175 	struct device *dev = &data->client->dev;  in sbsm_select()
179 	if (data->cur_chan == chan)  in sbsm_select()
184 	ret = sbsm_write_word(data->client, SBSM_CMD_BATSYSSTATE, reg);  in sbsm_select()
188 		data->cur_chan = chan;  in sbsm_select()
198 	ret = sbsm_read_word(data->client, SBSM_CMD_BATSYSSTATE);  in sbsm_gpio_get_value()
219 	if (!client || client->addr != 0x0b)  in sbsm_do_alert()
223 	if (client->dev.driver) {  in sbsm_do_alert()
224 		driver = to_i2c_driver(client->dev.driver);  in sbsm_do_alert()
225 		if (driver->alert)  in sbsm_do_alert()
226 			driver->alert(client, I2C_PROTOCOL_SMBUS_ALERT, 0);  in sbsm_do_alert()
228 			dev_warn(&client->dev, "no driver alert()!\n");  in sbsm_do_alert()
230 		dev_dbg(&client->dev, "alert with no driver\n");  in sbsm_do_alert()
234 	return -EBUSY;  in sbsm_do_alert()
244 	ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATE);  in sbsm_alert()
246 		irq_bat = ret ^ sbsm->last_state;  in sbsm_alert()
247 		sbsm->last_state = ret;  in sbsm_alert()
251 	ret = sbsm_read_word(sbsm->client, SBSM_CMD_BATSYSSTATECONT);  in sbsm_alert()
253 	    ((ret ^ sbsm->last_state_cont) & SBSM_BIT_AC_PRESENT)) {  in sbsm_alert()
254 		irq_bat |= sbsm->supported_bats & state;  in sbsm_alert()
255 		power_supply_changed(sbsm->psy);  in sbsm_alert()
257 	sbsm->last_state_cont = ret;  in sbsm_alert()
261 			device_for_each_child(&sbsm->muxc->adapter[i]->dev,  in sbsm_alert()
269 	struct gpio_chip *gc = &data->chip;  in sbsm_gpio_setup()
270 	struct i2c_client *client = data->client;  in sbsm_gpio_setup()
271 	struct device *dev = &client->dev;  in sbsm_gpio_setup()
274 	if (!device_property_present(dev, "gpio-controller"))  in sbsm_gpio_setup()
280 	data->last_state = ret;  in sbsm_gpio_setup()
285 	data->last_state_cont = ret;  in sbsm_gpio_setup()
287 	gc->get = sbsm_gpio_get_value;  in sbsm_gpio_setup()
288 	gc->direction_input  = sbsm_gpio_direction_input;  in sbsm_gpio_setup()
289 	gc->can_sleep = true;  in sbsm_gpio_setup()
290 	gc->base = -1;  in sbsm_gpio_setup()
291 	gc->ngpio = SBSM_MAX_BATS;  in sbsm_gpio_setup()
292 	gc->label = client->name;  in sbsm_gpio_setup()
293 	gc->parent = dev;  in sbsm_gpio_setup()
294 	gc->owner = THIS_MODULE;  in sbsm_gpio_setup()
317 	struct i2c_adapter *adapter = client->adapter;  in sbsm_probe()
319 	struct device *dev = &client->dev;  in sbsm_probe()
325 	if (client->addr != 0x0a)  in sbsm_probe()
326 		return -EINVAL;  in sbsm_probe()
329 		return -EPFNOSUPPORT;  in sbsm_probe()
333 		return -ENOMEM;  in sbsm_probe()
337 	data->client = client;  in sbsm_probe()
338 	data->is_ltc1760 = !!strstr(id->name, "ltc1760");  in sbsm_probe()
343 	data->supported_bats = ret & SBSM_MASK_BAT_SUPPORTED;  in sbsm_probe()
344 	data->muxc = i2c_mux_alloc(adapter, dev, SBSM_MAX_BATS, 0,  in sbsm_probe()
346 	if (!data->muxc) {  in sbsm_probe()
348 		ret = -ENOMEM;  in sbsm_probe()
351 	data->muxc->priv = data;  in sbsm_probe()
353 	/* register muxed i2c channels. One for each supported battery */  in sbsm_probe()
355 		if (data->supported_bats & BIT(i)) {  in sbsm_probe()
356 			ret = i2c_mux_add_adapter(data->muxc, 0, i + 1, 0);  in sbsm_probe()
370 		ret = -ENOMEM;  in sbsm_probe()
374 	psy_desc->name = devm_kasprintf(dev, GFP_KERNEL, "sbsm-%s",  in sbsm_probe()
375 					dev_name(&client->dev));  in sbsm_probe()
376 	if (!psy_desc->name) {  in sbsm_probe()
377 		ret = -ENOMEM;  in sbsm_probe()
385 	psy_cfg.of_node = dev->of_node;  in sbsm_probe()
386 	data->psy = devm_power_supply_register(dev, psy_desc, &psy_cfg);  in sbsm_probe()
387 	if (IS_ERR(data->psy)) {  in sbsm_probe()
388 		ret = PTR_ERR(data->psy);  in sbsm_probe()
390 			psy_desc->name);  in sbsm_probe()
398 	i2c_mux_del_adapters(data->muxc);  in sbsm_probe()
408 	i2c_mux_del_adapters(data->muxc);  in sbsm_remove()
413 	{ "sbs-manager", 0 },
421 	{ .compatible = "sbs,sbs-manager" },
441 MODULE_AUTHOR("Karl-Heinz Schneider <karl-heinz@schneider-inet.de>");
442 MODULE_DESCRIPTION("SBSM Smart Battery System Manager");