1 // SPDX-License-Identifier: GPL-2.0+
3 // max14577.c - mfd core driver for the Maxim 14577/77836
18 #include <linux/mfd/max14577-private.h>
42  * maxim_charger_calc_reg_current - Calculate register value for current
54  *  - is always between <limits.min, limits.max>;
55  *  - is always less or equal to max_ua;
56  *  - is the highest possible value;
57  *  - may be lower than min_ua.
59  * On success returns 0. On error returns -EINVAL (requested min/max current
68 		return -EINVAL;  in maxim_charger_calc_reg_current()
70 	if (min_ua > limits->max || max_ua < limits->min)  in maxim_charger_calc_reg_current()
71 		return -EINVAL;  in maxim_charger_calc_reg_current()
73 	if (max_ua < limits->high_start) {  in maxim_charger_calc_reg_current()
82 	/* max_ua is in range: <high_start, infinite>, cut it to limits.max */  in maxim_charger_calc_reg_current()
83 	max_ua = min(limits->max, max_ua);  in maxim_charger_calc_reg_current()
84 	max_ua -= limits->high_start;  in maxim_charger_calc_reg_current()
87 	 *  - max_ua >= limits.high_start  in maxim_charger_calc_reg_current()
88 	 *  - BUILD_BUG checks that 'limits' are: max >= high_start + high_step  in maxim_charger_calc_reg_current()
90 	current_bits = max_ua / limits->high_step;  in maxim_charger_calc_reg_current()
92 	/* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */  in maxim_charger_calc_reg_current()
103 		.name = "max14577-muic",
104 		.of_compatible = "maxim,max14577-muic",
107 		.name = "max14577-regulator",
108 		.of_compatible = "maxim,max14577-regulator",
111 		.name = "max14577-charger",
112 		.of_compatible = "maxim,max14577-charger",
118 		.name = "max77836-muic",
119 		.of_compatible = "maxim,max77836-muic",
122 		.name = "max77836-regulator",
123 		.of_compatible = "maxim,max77836-regulator",
126 		.name = "max77836-charger",
127 		.of_compatible = "maxim,max77836-charger",
130 		.name = "max77836-battery",
131 		.of_compatible = "maxim,max77836-battery",
216 	.irqs			= max14577_irqs,
241 	.name			= "max77836-muic",
245 	.irqs			= max77836_muic_irqs,
255 	.name			= "max77836-pmic",
259 	.irqs			= max77836_pmic_irqs,
268 	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,  in max14577_print_dev_type()
271 		dev_err(max14577->dev,  in max14577_print_dev_type()
281 	dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",  in max14577_print_dev_type()
282 			max14577->dev_type, device_id, vendor_id);  in max14577_print_dev_type()
299 	max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter,  in max77836_init()
301 	if (IS_ERR(max14577->i2c_pmic)) {  in max77836_init()
302 		dev_err(max14577->dev, "Failed to register PMIC I2C device\n");  in max77836_init()
303 		return PTR_ERR(max14577->i2c_pmic);  in max77836_init()
305 	i2c_set_clientdata(max14577->i2c_pmic, max14577);  in max77836_init()
307 	max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,  in max77836_init()
309 	if (IS_ERR(max14577->regmap_pmic)) {  in max77836_init()
310 		ret = PTR_ERR(max14577->regmap_pmic);  in max77836_init()
311 		dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",  in max77836_init()
316 	/* Un-mask MAX77836 Interrupt Source register */  in max77836_init()
317 	ret = max14577_read_reg(max14577->regmap_pmic,  in max77836_init()
320 		dev_err(max14577->dev, "Failed to read PMIC register\n");  in max77836_init()
326 	ret = max14577_write_reg(max14577->regmap_pmic,  in max77836_init()
329 		dev_err(max14577->dev, "Failed to write PMIC register\n");  in max77836_init()
333 	ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,  in max77836_init()
336 			&max14577->irq_data_pmic);  in max77836_init()
338 		dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",  in max77836_init()
339 				max14577->irq, ret);  in max77836_init()
346 	i2c_unregister_device(max14577->i2c_pmic);  in max77836_init()
352  * Max77836 specific de-initialization code for driver remove.
356 	regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);  in max77836_remove()
357 	i2c_unregister_device(max14577->i2c_pmic);  in max77836_remove()
363 	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);  in max14577_i2c_probe()
364 	struct device_node *np = i2c->dev.of_node;  in max14577_i2c_probe()
372 		pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);  in max14577_i2c_probe()
374 			return -ENOMEM;  in max14577_i2c_probe()
375 		i2c->dev.platform_data = pdata;  in max14577_i2c_probe()
379 		dev_err(&i2c->dev, "No platform data found.\n");  in max14577_i2c_probe()
380 		return -EINVAL;  in max14577_i2c_probe()
383 	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);  in max14577_i2c_probe()
385 		return -ENOMEM;  in max14577_i2c_probe()
388 	max14577->dev = &i2c->dev;  in max14577_i2c_probe()
389 	max14577->i2c = i2c;  in max14577_i2c_probe()
390 	max14577->irq = i2c->irq;  in max14577_i2c_probe()
392 	max14577->regmap = devm_regmap_init_i2c(i2c,  in max14577_i2c_probe()
394 	if (IS_ERR(max14577->regmap)) {  in max14577_i2c_probe()
395 		ret = PTR_ERR(max14577->regmap);  in max14577_i2c_probe()
396 		dev_err(max14577->dev, "Failed to allocate register map: %d\n",  in max14577_i2c_probe()
401 	max14577->dev_type = (kernel_ulong_t)i2c_get_match_data(i2c);  in max14577_i2c_probe()
405 	switch (max14577->dev_type) {  in max14577_i2c_probe()
421 	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,  in max14577_i2c_probe()
423 				  &max14577->irq_data);  in max14577_i2c_probe()
425 		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",  in max14577_i2c_probe()
426 				max14577->irq, ret);  in max14577_i2c_probe()
431 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {  in max14577_i2c_probe()
437 	ret = mfd_add_devices(max14577->dev, -1, mfd_devs,  in max14577_i2c_probe()
442 	device_init_wakeup(max14577->dev, 1);  in max14577_i2c_probe()
447 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)  in max14577_i2c_probe()
450 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);  in max14577_i2c_probe()
459 	mfd_remove_devices(max14577->dev);  in max14577_i2c_remove()
460 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);  in max14577_i2c_remove()
461 	if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)  in max14577_i2c_remove()
478 		enable_irq_wake(max14577->irq);  in max14577_suspend()
488 	disable_irq(max14577->irq);  in max14577_suspend()
499 		disable_irq_wake(max14577->irq);  in max14577_resume()
500 	enable_irq(max14577->irq);  in max14577_resume()
548 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");