xref: /linux/drivers/mfd/max77693.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
1 /*
2  * max77693.c - mfd core driver for the MAX 77693
3  *
4  * Copyright (C) 2012 Samsung Electronics
5  * SangYoung Son <hello.son@smasung.com>
6  *
7  * This program is not provided / owned by Maxim Integrated Products.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  * This driver is based on max8997.c
24  */
25 
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
29 #include <linux/err.h>
30 #include <linux/interrupt.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/mutex.h>
33 #include <linux/mfd/core.h>
34 #include <linux/mfd/max77693.h>
35 #include <linux/mfd/max77693-private.h>
36 #include <linux/regulator/machine.h>
37 #include <linux/regmap.h>
38 
39 #define I2C_ADDR_PMIC	(0xCC >> 1)	/* Charger, Flash LED */
40 #define I2C_ADDR_MUIC	(0x4A >> 1)
41 #define I2C_ADDR_HAPTIC	(0x90 >> 1)
42 
43 static struct mfd_cell max77693_devs[] = {
44 	{ .name = "max77693-pmic", },
45 	{ .name = "max77693-charger", },
46 	{ .name = "max77693-flash", },
47 	{ .name = "max77693-muic", },
48 	{ .name = "max77693-haptic", },
49 };
50 
51 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
52 {
53 	unsigned int val;
54 	int ret;
55 
56 	ret = regmap_read(map, reg, &val);
57 	*dest = val;
58 
59 	return ret;
60 }
61 EXPORT_SYMBOL_GPL(max77693_read_reg);
62 
63 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
64 {
65 	int ret;
66 
67 	ret = regmap_bulk_read(map, reg, buf, count);
68 
69 	return ret;
70 }
71 EXPORT_SYMBOL_GPL(max77693_bulk_read);
72 
73 int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
74 {
75 	int ret;
76 
77 	ret = regmap_write(map, reg, value);
78 
79 	return ret;
80 }
81 EXPORT_SYMBOL_GPL(max77693_write_reg);
82 
83 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
84 {
85 	int ret;
86 
87 	ret = regmap_bulk_write(map, reg, buf, count);
88 
89 	return ret;
90 }
91 EXPORT_SYMBOL_GPL(max77693_bulk_write);
92 
93 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
94 {
95 	int ret;
96 
97 	ret = regmap_update_bits(map, reg, mask, val);
98 
99 	return ret;
100 }
101 EXPORT_SYMBOL_GPL(max77693_update_reg);
102 
103 static const struct regmap_config max77693_regmap_config = {
104 	.reg_bits = 8,
105 	.val_bits = 8,
106 	.max_register = MAX77693_PMIC_REG_END,
107 };
108 
109 static int max77693_i2c_probe(struct i2c_client *i2c,
110 			      const struct i2c_device_id *id)
111 {
112 	struct max77693_dev *max77693;
113 	struct max77693_platform_data *pdata = i2c->dev.platform_data;
114 	u8 reg_data;
115 	int ret = 0;
116 
117 	max77693 = devm_kzalloc(&i2c->dev,
118 			sizeof(struct max77693_dev), GFP_KERNEL);
119 	if (max77693 == NULL)
120 		return -ENOMEM;
121 
122 	max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
123 	if (IS_ERR(max77693->regmap)) {
124 		ret = PTR_ERR(max77693->regmap);
125 		dev_err(max77693->dev,"failed to allocate register map: %d\n",
126 				ret);
127 		goto err_regmap;
128 	}
129 
130 	i2c_set_clientdata(i2c, max77693);
131 	max77693->dev = &i2c->dev;
132 	max77693->i2c = i2c;
133 	max77693->irq = i2c->irq;
134 	max77693->type = id->driver_data;
135 
136 	if (!pdata)
137 		goto err_regmap;
138 
139 	max77693->wakeup = pdata->wakeup;
140 
141 	mutex_init(&max77693->iolock);
142 
143 	if (max77693_read_reg(max77693->regmap,
144 				MAX77693_PMIC_REG_PMIC_ID2, &reg_data) < 0) {
145 		dev_err(max77693->dev, "device not found on this channel\n");
146 		ret = -ENODEV;
147 		goto err_regmap;
148 	} else
149 		dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
150 
151 	max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
152 	i2c_set_clientdata(max77693->muic, max77693);
153 
154 	max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
155 	i2c_set_clientdata(max77693->haptic, max77693);
156 
157 	ret = max77693_irq_init(max77693);
158 	if (ret < 0)
159 		goto err_mfd;
160 
161 	pm_runtime_set_active(max77693->dev);
162 
163 	ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
164 			ARRAY_SIZE(max77693_devs), NULL, 0);
165 	if (ret < 0)
166 		goto err_mfd;
167 
168 	device_init_wakeup(max77693->dev, pdata->wakeup);
169 
170 	return ret;
171 
172 err_mfd:
173 	i2c_unregister_device(max77693->muic);
174 	i2c_unregister_device(max77693->haptic);
175 err_regmap:
176 	kfree(max77693);
177 
178 	return ret;
179 }
180 
181 static int max77693_i2c_remove(struct i2c_client *i2c)
182 {
183 	struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
184 
185 	mfd_remove_devices(max77693->dev);
186 	i2c_unregister_device(max77693->muic);
187 	i2c_unregister_device(max77693->haptic);
188 
189 	return 0;
190 }
191 
192 static const struct i2c_device_id max77693_i2c_id[] = {
193 	{ "max77693", TYPE_MAX77693 },
194 	{ }
195 };
196 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
197 
198 static int max77693_suspend(struct device *dev)
199 {
200 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
201 	struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
202 
203 	if (device_may_wakeup(dev))
204 		irq_set_irq_wake(max77693->irq, 1);
205 	return 0;
206 }
207 
208 static int max77693_resume(struct device *dev)
209 {
210 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
211 	struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
212 
213 	if (device_may_wakeup(dev))
214 		irq_set_irq_wake(max77693->irq, 0);
215 	return max77693_irq_resume(max77693);
216 }
217 
218 const struct dev_pm_ops max77693_pm = {
219 	.suspend = max77693_suspend,
220 	.resume = max77693_resume,
221 };
222 
223 static struct i2c_driver max77693_i2c_driver = {
224 	.driver = {
225 		   .name = "max77693",
226 		   .owner = THIS_MODULE,
227 		   .pm = &max77693_pm,
228 	},
229 	.probe = max77693_i2c_probe,
230 	.remove = max77693_i2c_remove,
231 	.id_table = max77693_i2c_id,
232 };
233 
234 static int __init max77693_i2c_init(void)
235 {
236 	return i2c_add_driver(&max77693_i2c_driver);
237 }
238 /* init early so consumer devices can complete system boot */
239 subsys_initcall(max77693_i2c_init);
240 
241 static void __exit max77693_i2c_exit(void)
242 {
243 	i2c_del_driver(&max77693_i2c_driver);
244 }
245 module_exit(max77693_i2c_exit);
246 
247 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
248 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
249 MODULE_LICENSE("GPL");
250