1 // SPDX-License-Identifier: GPL-2.0-only
3  * I2C client/driver for the Linear Technology LTC2941, LTC2942, LTC2943
71 	struct i2c_client *client;	/* I2C Client pointer */  member
75 	enum ltc294x_id id;		/* Chip type */  member
84 	return ((Q * (info->Qlsb / 10))) / 100;  in convert_bin_to_uAh()
92 	Q = (uAh * 100) / (info->Qlsb/10);  in convert_uAh_to_bin()
96 static int ltc294x_read_regs(struct i2c_client *client,  in ltc294x_read_regs()  argument
103 	msgs[0].addr	= client->addr;  in ltc294x_read_regs()
107 	msgs[1].addr	= client->addr;  in ltc294x_read_regs()
112 	ret = i2c_transfer(client->adapter, &msgs[0], 2);  in ltc294x_read_regs()
114 		dev_err(&client->dev, "ltc2941 read_reg failed!\n");  in ltc294x_read_regs()
118 	dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",  in ltc294x_read_regs()
124 static int ltc294x_write_regs(struct i2c_client *client,  in ltc294x_write_regs()  argument
130 	ret = i2c_smbus_write_i2c_block_data(client, reg_start, num_regs, buf);  in ltc294x_write_regs()
132 		dev_err(&client->dev, "ltc2941 write_reg failed!\n");  in ltc294x_write_regs()
136 	dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",  in ltc294x_write_regs()
149 	ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);  in ltc294x_reset()
151 		dev_err(&info->client->dev,  in ltc294x_reset()
159 	switch (info->id) {  in ltc294x_reset()
172 		ret = ltc294x_write_regs(info->client,  in ltc294x_reset()
175 			dev_err(&info->client->dev,  in ltc294x_reset()
193 	ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);  in ltc294x_read_charge_register()
207 	if (info->Qlsb < 0)  in ltc294x_get_charge()
208 		value -= 0xFFFF;  in ltc294x_get_charge()
221 	/* Direction depends on how sense+/- were connected */  in ltc294x_set_charge_now()
222 	if (info->Qlsb < 0)  in ltc294x_set_charge_now()
225 		return -EINVAL;  in ltc294x_set_charge_now()
228 	ret = ltc294x_read_regs(info->client,  in ltc294x_set_charge_now()
234 	ret = ltc294x_write_regs(info->client,  in ltc294x_set_charge_now()
241 	ret = ltc294x_write_regs(info->client,  in ltc294x_set_charge_now()
248 	ret = ltc294x_write_regs(info->client,  in ltc294x_set_charge_now()
261 	/* Direction depends on how sense+/- were connected */  in ltc294x_set_charge_thr()
262 	if (info->Qlsb < 0)  in ltc294x_set_charge_thr()
265 		return -EINVAL;  in ltc294x_set_charge_thr()
270 	return ltc294x_write_regs(info->client, reg, &dataw[0], 2);  in ltc294x_set_charge_thr()
280 	value -= LTC294X_MID_SUPPLY;  in ltc294x_get_charge_counter()
291 	ret = ltc294x_read_regs(info->client,  in ltc294x_get_voltage()
294 	switch (info->id) {  in ltc294x_get_voltage()
321 	ret = ltc294x_read_regs(info->client,  in ltc294x_get_current()
324 	value -= 0x7FFF;  in ltc294x_get_current()
325 	if (info->id == LTC2944_ID)  in ltc294x_get_current()
329 	/* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm,  in ltc294x_get_current()
332 	*val = 1000 * (value / (info->r_sense * 0x7FFF)); /* in uA */  in ltc294x_get_current()
343 	if (info->id == LTC2942_ID) {  in ltc294x_get_temperature()
345 		value = 6000;	/* Full-scale is 600 Kelvin */  in ltc294x_get_temperature()
348 		value = 5100;	/* Full-scale is 510 Kelvin */  in ltc294x_get_temperature()
350 	ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);  in ltc294x_get_temperature()
353 	*val = value / 0xFFFF - 2722;  in ltc294x_get_temperature()
366 						&val->intval);  in ltc294x_get_property()
369 						&val->intval);  in ltc294x_get_property()
372 						&val->intval);  in ltc294x_get_property()
374 		return ltc294x_get_charge_counter(info, &val->intval);  in ltc294x_get_property()
376 		return ltc294x_get_voltage(info, &val->intval);  in ltc294x_get_property()
378 		return ltc294x_get_current(info, &val->intval);  in ltc294x_get_property()
380 		return ltc294x_get_temperature(info, &val->intval);  in ltc294x_get_property()
382 		return -EINVAL;  in ltc294x_get_property()
395 			LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval);  in ltc294x_set_property()
398 			LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval);  in ltc294x_set_property()
400 		return ltc294x_set_charge_now(info, val->intval);  in ltc294x_set_property()
402 		return -EPERM;  in ltc294x_set_property()
423 	if (charge != info->charge) {  in ltc294x_update()
424 		info->charge = charge;  in ltc294x_update()
425 		power_supply_changed(info->supply);  in ltc294x_update()
435 	schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);  in ltc294x_work()
448 static int ltc294x_i2c_remove(struct i2c_client *client)  in ltc294x_i2c_remove()  argument
450 	struct ltc294x_info *info = i2c_get_clientdata(client);  in ltc294x_i2c_remove()
452 	cancel_delayed_work_sync(&info->work);  in ltc294x_i2c_remove()
453 	power_supply_unregister(info->supply);  in ltc294x_i2c_remove()
457 static int ltc294x_i2c_probe(struct i2c_client *client,  in ltc294x_i2c_probe()  argument
458 	const struct i2c_device_id *id)  in ltc294x_i2c_probe()  argument
468 	info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);  in ltc294x_i2c_probe()
470 		return -ENOMEM;  in ltc294x_i2c_probe()
472 	i2c_set_clientdata(client, info);  in ltc294x_i2c_probe()
474 	np = of_node_get(client->dev.of_node);  in ltc294x_i2c_probe()
476 	info->id = (enum ltc294x_id) (uintptr_t) of_device_get_match_data(  in ltc294x_i2c_probe()
477 							&client->dev);  in ltc294x_i2c_probe()
478 	info->supply_desc.name = np->name;  in ltc294x_i2c_probe()
481 	 * instead of the sense-. This results in reversed measurements. */  in ltc294x_i2c_probe()
482 	ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense);  in ltc294x_i2c_probe()
484 		dev_err(&client->dev,  in ltc294x_i2c_probe()
485 			"Could not find lltc,resistor-sense in devicetree\n");  in ltc294x_i2c_probe()
488 	info->r_sense = r_sense;  in ltc294x_i2c_probe()
490 	ret = of_property_read_u32(np, "lltc,prescaler-exponent",  in ltc294x_i2c_probe()
493 		dev_warn(&client->dev,  in ltc294x_i2c_probe()
494 			"lltc,prescaler-exponent not in devicetree\n");  in ltc294x_i2c_probe()
498 	if (info->id == LTC2943_ID) {  in ltc294x_i2c_probe()
501 		info->Qlsb = ((340 * 50000) / r_sense) /  in ltc294x_i2c_probe()
506 		info->Qlsb = ((85 * 50000) / r_sense) /  in ltc294x_i2c_probe()
511 	if (info->id == LTC2941_ID || info->id == LTC2942_ID) {  in ltc294x_i2c_probe()
512 		ret = ltc294x_read_regs(client, LTC294X_REG_STATUS, &status, 1);  in ltc294x_i2c_probe()
514 			dev_err(&client->dev,  in ltc294x_i2c_probe()
519 			info->id = LTC2941_ID;  in ltc294x_i2c_probe()
521 			info->id = LTC2942_ID;  in ltc294x_i2c_probe()
524 	info->client = client;  in ltc294x_i2c_probe()
525 	info->supply_desc.type = POWER_SUPPLY_TYPE_BATTERY;  in ltc294x_i2c_probe()
526 	info->supply_desc.properties = ltc294x_properties;  in ltc294x_i2c_probe()
527 	switch (info->id) {  in ltc294x_i2c_probe()
530 		info->supply_desc.num_properties =  in ltc294x_i2c_probe()
534 		info->supply_desc.num_properties =  in ltc294x_i2c_probe()
535 			ARRAY_SIZE(ltc294x_properties) - 1;  in ltc294x_i2c_probe()
539 		info->supply_desc.num_properties =  in ltc294x_i2c_probe()
540 			ARRAY_SIZE(ltc294x_properties) - 3;  in ltc294x_i2c_probe()
543 	info->supply_desc.get_property = ltc294x_get_property;  in ltc294x_i2c_probe()
544 	info->supply_desc.set_property = ltc294x_set_property;  in ltc294x_i2c_probe()
545 	info->supply_desc.property_is_writeable = ltc294x_property_is_writeable;  in ltc294x_i2c_probe()
546 	info->supply_desc.external_power_changed	= NULL;  in ltc294x_i2c_probe()
550 	INIT_DELAYED_WORK(&info->work, ltc294x_work);  in ltc294x_i2c_probe()
554 		dev_err(&client->dev, "Communication with chip failed\n");  in ltc294x_i2c_probe()
558 	info->supply = power_supply_register(&client->dev, &info->supply_desc,  in ltc294x_i2c_probe()
560 	if (IS_ERR(info->supply)) {  in ltc294x_i2c_probe()
561 		dev_err(&client->dev, "failed to register ltc2941\n");  in ltc294x_i2c_probe()
562 		return PTR_ERR(info->supply);  in ltc294x_i2c_probe()
564 		schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);  in ltc294x_i2c_probe()
570 static void ltc294x_i2c_shutdown(struct i2c_client *client)  in ltc294x_i2c_shutdown()  argument
572 	struct ltc294x_info *info = i2c_get_clientdata(client);  in ltc294x_i2c_shutdown()
578 	if (info->id == LTC2941_ID)  in ltc294x_i2c_shutdown()
582 	ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);  in ltc294x_i2c_shutdown()
589 		ltc294x_write_regs(info->client, LTC294X_REG_CONTROL,  in ltc294x_i2c_shutdown()
597 	struct i2c_client *client = to_i2c_client(dev);  in ltc294x_suspend()  local
598 	struct ltc294x_info *info = i2c_get_clientdata(client);  in ltc294x_suspend()
600 	cancel_delayed_work(&info->work);  in ltc294x_suspend()
606 	struct i2c_client *client = to_i2c_client(dev);  in ltc294x_resume()  local
607 	struct ltc294x_info *info = i2c_get_clientdata(client);  in ltc294x_resume()
609 	schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);  in ltc294x_resume()