Merge branch 'vmwgfx-fixes-4.3' of git://people.freedesktop.org/~thomash/linux
[firefly-linux-kernel-4.4.55.git] / drivers / mfd / rn5t618.c
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
20 static const struct mfd_cell rn5t618_cells[] = {
21         { .name = "rn5t618-regulator" },
22         { .name = "rn5t618-wdt" },
23 };
24
25 static 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
42 static 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
50 static struct rn5t618 *rn5t618_pm_power_off;
51
52 static 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
62 static 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
96 static 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
109 static const struct of_device_id rn5t618_of_match[] = {
110         { .compatible = "ricoh,rn5t618" },
111         { }
112 };
113 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
114
115 static const struct i2c_device_id rn5t618_i2c_id[] = {
116         { }
117 };
118 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
119
120 static 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
130 module_i2c_driver(rn5t618_i2c_driver);
131
132 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
133 MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
134 MODULE_LICENSE("GPL v2");