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gerrit-public.fairphone.software / kernel / msm-4.9 / 4ba10fc04a0bd461b31cd5032207cb38304d7b63 / . / drivers / mfd / rn5t618.c
blob: 666857192dbeb6db52795b2d462172856aed2e23 [file] [log] [blame]
Beniamino Galvani9bb9e292014-08-30 14:50:23 +0200[diff] [blame]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");