1 // SPDX-License-Identifier: GPL-2.0+
3 // max14577.c - mfd core driver for the Maxim 14577/77836
16 #include <linux/mfd/max14577.h>
17 #include <linux/mfd/max14577-private.h>
21  * It is placed here because it is used by both charger and regulator driver.
41  * maxim_charger_calc_reg_current - Calculate register value for current
53  *  - is always between <limits.min, limits.max>;
54  *  - is always less or equal to max_ua;
55  *  - is the highest possible value;
56  *  - may be lower than min_ua.
58  * On success returns 0. On error returns -EINVAL (requested min/max current
67 		return -EINVAL;  in maxim_charger_calc_reg_current()
69 	if (min_ua > limits->max || max_ua < limits->min)  in maxim_charger_calc_reg_current()
70 		return -EINVAL;  in maxim_charger_calc_reg_current()
72 	if (max_ua < limits->high_start) {  in maxim_charger_calc_reg_current()
82 	max_ua = min(limits->max, max_ua);  in maxim_charger_calc_reg_current()
83 	max_ua -= limits->high_start;  in maxim_charger_calc_reg_current()
86 	 *  - max_ua >= limits.high_start  in maxim_charger_calc_reg_current()
87 	 *  - BUILD_BUG checks that 'limits' are: max >= high_start + high_step  in maxim_charger_calc_reg_current()
89 	current_bits = max_ua / limits->high_step;  in maxim_charger_calc_reg_current()
102 		.name = "max14577-muic",
103 		.of_compatible = "maxim,max14577-muic",
106 		.name = "max14577-regulator",
107 		.of_compatible = "maxim,max14577-regulator",
110 		.name = "max14577-charger",
111 		.of_compatible = "maxim,max14577-charger",
117 		.name = "max77836-muic",
118 		.of_compatible = "maxim,max77836-muic",
121 		.name = "max77836-regulator",
122 		.of_compatible = "maxim,max77836-regulator",
125 		.name = "max77836-charger",
126 		.of_compatible = "maxim,max77836-charger",
129 		.name = "max77836-battery",
130 		.of_compatible = "maxim,max77836-battery",
136 		.compatible = "maxim,max14577",
159 	/* Any max14577 volatile registers are also max77836 volatile. */  in max77836_muic_volatile_reg()
210 	.name			= "max14577",
240 	.name			= "max77836-muic",
255 	.name			= "max77836-pmic",
264 static void max14577_print_dev_type(struct max14577 *max14577)  in max14577_print_dev_type()  argument
269 	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,  in max14577_print_dev_type()
272 		dev_err(max14577->dev,  in max14577_print_dev_type()
282 	dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",  in max14577_print_dev_type()
283 			max14577->dev_type, device_id, vendor_id);  in max14577_print_dev_type()
295 static int max77836_init(struct max14577 *max14577)  in max77836_init()  argument
300 	max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter,  in max77836_init()
302 	if (IS_ERR(max14577->i2c_pmic)) {  in max77836_init()
303 		dev_err(max14577->dev, "Failed to register PMIC I2C device\n");  in max77836_init()
304 		return PTR_ERR(max14577->i2c_pmic);  in max77836_init()
306 	i2c_set_clientdata(max14577->i2c_pmic, max14577);  in max77836_init()
308 	max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,  in max77836_init()
310 	if (IS_ERR(max14577->regmap_pmic)) {  in max77836_init()
311 		ret = PTR_ERR(max14577->regmap_pmic);  in max77836_init()
312 		dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",  in max77836_init()
317 	/* Un-mask MAX77836 Interrupt Source register */  in max77836_init()
318 	ret = max14577_read_reg(max14577->regmap_pmic,  in max77836_init()
321 		dev_err(max14577->dev, "Failed to read PMIC register\n");  in max77836_init()
327 	ret = max14577_write_reg(max14577->regmap_pmic,  in max77836_init()
330 		dev_err(max14577->dev, "Failed to write PMIC register\n");  in max77836_init()
334 	ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,  in max77836_init()
337 			&max14577->irq_data_pmic);  in max77836_init()
339 		dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",  in max77836_init()
340 				max14577->irq, ret);  in max77836_init()
347 	i2c_unregister_device(max14577->i2c_pmic);  in max77836_init()
353  * Max77836 specific de-initialization code for driver remove.
355 static void max77836_remove(struct max14577 *max14577)  in max77836_remove()  argument
357 	regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);  in max77836_remove()
358 	i2c_unregister_device(max14577->i2c_pmic);  in max77836_remove()
364 	struct max14577 *max14577;  in max14577_i2c_probe()  local
365 	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);  in max14577_i2c_probe()
366 	struct device_node *np = i2c->dev.of_node;  in max14577_i2c_probe()
374 		pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);  in max14577_i2c_probe()
376 			return -ENOMEM;  in max14577_i2c_probe()
377 		i2c->dev.platform_data = pdata;  in max14577_i2c_probe()
381 		dev_err(&i2c->dev, "No platform data found.\n");  in max14577_i2c_probe()
382 		return -EINVAL;  in max14577_i2c_probe()
385 	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);  in max14577_i2c_probe()
386 	if (!max14577)  in max14577_i2c_probe()
387 		return -ENOMEM;  in max14577_i2c_probe()
389 	i2c_set_clientdata(i2c, max14577);  in max14577_i2c_probe()
390 	max14577->dev = &i2c->dev;  in max14577_i2c_probe()
391 	max14577->i2c = i2c;  in max14577_i2c_probe()
392 	max14577->irq = i2c->irq;  in max14577_i2c_probe()
394 	max14577->regmap = devm_regmap_init_i2c(i2c,  in max14577_i2c_probe()
396 	if (IS_ERR(max14577->regmap)) {  in max14577_i2c_probe()
397 		ret = PTR_ERR(max14577->regmap);  in max14577_i2c_probe()
398 		dev_err(max14577->dev, "Failed to allocate register map: %d\n",  in max14577_i2c_probe()
406 		of_id = of_match_device(max14577_dt_match, &i2c->dev);  in max14577_i2c_probe()
408 			max14577->dev_type =  in max14577_i2c_probe()
409 				(enum maxim_device_type)of_id->data;  in max14577_i2c_probe()
411 		max14577->dev_type = id->driver_data;  in max14577_i2c_probe()
414 	max14577_print_dev_type(max14577);  in max14577_i2c_probe()
416 	switch (max14577->dev_type) {  in max14577_i2c_probe()
432 	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,  in max14577_i2c_probe()
434 				  &max14577->irq_data);  in max14577_i2c_probe()
436 		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",  in max14577_i2c_probe()
437 				max14577->irq, ret);  in max14577_i2c_probe()
442 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {  in max14577_i2c_probe()
443 		ret = max77836_init(max14577);  in max14577_i2c_probe()
448 	ret = mfd_add_devices(max14577->dev, -1, mfd_devs,  in max14577_i2c_probe()
453 	device_init_wakeup(max14577->dev, 1);  in max14577_i2c_probe()
458 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)  in max14577_i2c_probe()
459 		max77836_remove(max14577);  in max14577_i2c_probe()
461 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);  in max14577_i2c_probe()
468 	struct max14577 *max14577 = i2c_get_clientdata(i2c);  in max14577_i2c_remove()  local
470 	mfd_remove_devices(max14577->dev);  in max14577_i2c_remove()
471 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);  in max14577_i2c_remove()
472 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)  in max14577_i2c_remove()
473 		max77836_remove(max14577);  in max14577_i2c_remove()
477 	{ "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
487 	struct max14577 *max14577 = i2c_get_clientdata(i2c);  in max14577_suspend()  local
490 		enable_irq_wake(max14577->irq);  in max14577_suspend()
500 	disable_irq(max14577->irq);  in max14577_suspend()
508 	struct max14577 *max14577 = i2c_get_clientdata(i2c);  in max14577_resume()  local
511 		disable_irq_wake(max14577->irq);  in max14577_resume()
512 	enable_irq(max14577->irq);  in max14577_resume()
522 		.name = "max14577",
561 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");