1/*
2 * MFD core driver for Ricoh RN5T618 PMIC
3 *
4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
12 */
13
14#include <linux/i2c.h>
15#include <linux/mfd/core.h>
16#include <linux/mfd/rn5t618.h>
17#include <linux/module.h>
18#include <linux/regmap.h>
19
20static const struct mfd_cell rn5t618_cells[] = {
21	{ .name = "rn5t618-regulator" },
22	{ .name = "rn5t618-wdt" },
23};
24
25static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
26{
27	switch (reg) {
28	case RN5T618_WATCHDOGCNT:
29	case RN5T618_DCIRQ:
30	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
31	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
32	case RN5T618_IR_GPR:
33	case RN5T618_IR_GPF:
34	case RN5T618_MON_IOIN:
35	case RN5T618_INTMON:
36		return true;
37	default:
38		return false;
39	}
40}
41
42static const struct regmap_config rn5t618_regmap_config = {
43	.reg_bits	= 8,
44	.val_bits	= 8,
45	.volatile_reg	= rn5t618_volatile_reg,
46	.max_register	= RN5T618_MAX_REG,
47	.cache_type	= REGCACHE_RBTREE,
48};
49
50static struct rn5t618 *rn5t618_pm_power_off;
51
52static void rn5t618_power_off(void)
53{
54	/* disable automatic repower-on */
55	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
56			   RN5T618_REPCNT_REPWRON, 0);
57	/* start power-off sequence */
58	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
59			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
60}
61
62static int rn5t618_i2c_probe(struct i2c_client *i2c,
63			     const struct i2c_device_id *id)
64{
65	struct rn5t618 *priv;
66	int ret;
67
68	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
69	if (!priv)
70		return -ENOMEM;
71
72	i2c_set_clientdata(i2c, priv);
73
74	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
75	if (IS_ERR(priv->regmap)) {
76		ret = PTR_ERR(priv->regmap);
77		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
78		return ret;
79	}
80
81	ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
82			      ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
83	if (ret) {
84		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
85		return ret;
86	}
87
88	if (!pm_power_off) {
89		rn5t618_pm_power_off = priv;
90		pm_power_off = rn5t618_power_off;
91	}
92
93	return 0;
94}
95
96static int rn5t618_i2c_remove(struct i2c_client *i2c)
97{
98	struct rn5t618 *priv = i2c_get_clientdata(i2c);
99
100	if (priv == rn5t618_pm_power_off) {
101		rn5t618_pm_power_off = NULL;
102		pm_power_off = NULL;
103	}
104
105	mfd_remove_devices(&i2c->dev);
106	return 0;
107}
108
109static const struct of_device_id rn5t618_of_match[] = {
110	{ .compatible = "ricoh,rn5t618" },
111	{ }
112};
113MODULE_DEVICE_TABLE(of, rn5t618_of_match);
114
115static const struct i2c_device_id rn5t618_i2c_id[] = {
116	{ }
117};
118MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
119
120static struct i2c_driver rn5t618_i2c_driver = {
121	.driver = {
122		.name = "rn5t618",
123		.of_match_table = of_match_ptr(rn5t618_of_match),
124	},
125	.probe = rn5t618_i2c_probe,
126	.remove = rn5t618_i2c_remove,
127	.id_table = rn5t618_i2c_id,
128};
129
130module_i2c_driver(rn5t618_i2c_driver);
131
132MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
133MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
134MODULE_LICENSE("GPL v2");
135