1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// MFD core driver for the Maxim MAX77843
  4//
  5// Copyright (C) 2015 Samsung Electronics
  6// Author: Jaewon Kim <jaewon02.kim@samsung.com>
  7// Author: Beomho Seo <beomho.seo@samsung.com>
  8
  9#include <linux/err.h>
 10#include <linux/i2c.h>
 11#include <linux/init.h>
 12#include <linux/interrupt.h>
 13#include <linux/mfd/core.h>
 14#include <linux/mfd/max77693-common.h>
 15#include <linux/mfd/max77843-private.h>
 16#include <linux/of_device.h>
 17#include <linux/platform_device.h>
 18
 19static const struct mfd_cell max77843_devs[] = {
 20	{
 21		.name = "max77843-muic",
 22		.of_compatible = "maxim,max77843-muic",
 23	}, {
 24		.name = "max77843-regulator",
 25		.of_compatible = "maxim,max77843-regulator",
 26	}, {
 27		.name = "max77843-charger",
 28		.of_compatible = "maxim,max77843-charger"
 29	}, {
 30		.name = "max77843-fuelgauge",
 31		.of_compatible = "maxim,max77843-fuelgauge",
 32	}, {
 33		.name = "max77843-haptic",
 34		.of_compatible = "maxim,max77843-haptic",
 35	},
 36};
 37
 38static const struct regmap_config max77843_charger_regmap_config = {
 39	.reg_bits	= 8,
 40	.val_bits	= 8,
 41	.max_register	= MAX77843_CHG_REG_END,
 42};
 43
 44static const struct regmap_config max77843_regmap_config = {
 45	.reg_bits	= 8,
 46	.val_bits	= 8,
 47	.max_register	= MAX77843_SYS_REG_END,
 48};
 49
 50static const struct regmap_irq max77843_irqs[] = {
 51	/* TOPSYS interrupts */
 52	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
 53	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
 54	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
 55	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
 56};
 57
 58static const struct regmap_irq_chip max77843_irq_chip = {
 59	.name		= "max77843",
 60	.status_base	= MAX77843_SYS_REG_SYSINTSRC,
 61	.mask_base	= MAX77843_SYS_REG_SYSINTMASK,
 62	.mask_invert	= false,
 63	.num_regs	= 1,
 64	.irqs		= max77843_irqs,
 65	.num_irqs	= ARRAY_SIZE(max77843_irqs),
 66};
 67
 68/* Charger and Charger regulator use same regmap. */
 69static int max77843_chg_init(struct max77693_dev *max77843)
 70{
 71	int ret;
 72
 73	max77843->i2c_chg = i2c_new_dummy_device(max77843->i2c->adapter, I2C_ADDR_CHG);
 74	if (IS_ERR(max77843->i2c_chg)) {
 75		dev_err(&max77843->i2c->dev,
 76				"Cannot allocate I2C device for Charger\n");
 77		return PTR_ERR(max77843->i2c_chg);
 78	}
 79	i2c_set_clientdata(max77843->i2c_chg, max77843);
 80
 81	max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
 82			&max77843_charger_regmap_config);
 83	if (IS_ERR(max77843->regmap_chg)) {
 84		ret = PTR_ERR(max77843->regmap_chg);
 85		goto err_chg_i2c;
 86	}
 87
 88	return 0;
 89
 90err_chg_i2c:
 91	i2c_unregister_device(max77843->i2c_chg);
 92
 93	return ret;
 94}
 95
 96static int max77843_probe(struct i2c_client *i2c,
 97			  const struct i2c_device_id *id)
 98{
 99	struct max77693_dev *max77843;
100	unsigned int reg_data;
101	int ret;
102
103	max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
104	if (!max77843)
105		return -ENOMEM;
106
107	i2c_set_clientdata(i2c, max77843);
108	max77843->dev = &i2c->dev;
109	max77843->i2c = i2c;
110	max77843->irq = i2c->irq;
111	max77843->type = id->driver_data;
112
113	max77843->regmap = devm_regmap_init_i2c(i2c,
114			&max77843_regmap_config);
115	if (IS_ERR(max77843->regmap)) {
116		dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
117		return PTR_ERR(max77843->regmap);
118	}
119
120	ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
121			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
122			0, &max77843_irq_chip, &max77843->irq_data_topsys);
123	if (ret) {
124		dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
125		return ret;
126	}
127
128	ret = regmap_read(max77843->regmap,
129			MAX77843_SYS_REG_PMICID, &reg_data);
130	if (ret < 0) {
131		dev_err(&i2c->dev, "Failed to read PMIC ID\n");
132		goto err_pmic_id;
133	}
134	dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
135
136	ret = max77843_chg_init(max77843);
137	if (ret) {
138		dev_err(&i2c->dev, "Failed to init Charger\n");
139		goto err_pmic_id;
140	}
141
142	ret = regmap_update_bits(max77843->regmap,
143				 MAX77843_SYS_REG_INTSRCMASK,
144				 MAX77843_INTSRC_MASK_MASK,
145				 (unsigned int)~MAX77843_INTSRC_MASK_MASK);
146	if (ret < 0) {
147		dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
148		goto err_pmic_id;
149	}
150
151	ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
152			      ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
153	if (ret < 0) {
154		dev_err(&i2c->dev, "Failed to add mfd device\n");
155		goto err_pmic_id;
156	}
157
158	device_init_wakeup(max77843->dev, true);
159
160	return 0;
161
162err_pmic_id:
163	regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
164
165	return ret;
166}
167
168static const struct of_device_id max77843_dt_match[] = {
169	{ .compatible = "maxim,max77843", },
170	{ },
171};
172
173static const struct i2c_device_id max77843_id[] = {
174	{ "max77843", TYPE_MAX77843, },
175	{ },
176};
177
178static int __maybe_unused max77843_suspend(struct device *dev)
179{
180	struct i2c_client *i2c = to_i2c_client(dev);
181	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
182
183	disable_irq(max77843->irq);
184	if (device_may_wakeup(dev))
185		enable_irq_wake(max77843->irq);
186
187	return 0;
188}
189
190static int __maybe_unused max77843_resume(struct device *dev)
191{
192	struct i2c_client *i2c = to_i2c_client(dev);
193	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
194
195	if (device_may_wakeup(dev))
196		disable_irq_wake(max77843->irq);
197	enable_irq(max77843->irq);
198
199	return 0;
200}
201
202static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
203
204static struct i2c_driver max77843_i2c_driver = {
205	.driver	= {
206		.name = "max77843",
207		.pm = &max77843_pm,
208		.of_match_table = max77843_dt_match,
209		.suppress_bind_attrs = true,
210	},
211	.probe = max77843_probe,
212	.id_table = max77843_id,
213};
214
215static int __init max77843_i2c_init(void)
216{
217	return i2c_add_driver(&max77843_i2c_driver);
218}
219subsys_initcall(max77843_i2c_init);