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15#include <linux/delay.h>
16#include <linux/i2c.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/rn5t618.h>
19#include <linux/module.h>
20#include <linux/of_device.h>
21#include <linux/reboot.h>
22#include <linux/regmap.h>
23
24static const struct mfd_cell rn5t618_cells[] = {
25 { .name = "rn5t618-regulator" },
26 { .name = "rn5t618-wdt" },
27};
28
29static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
30{
31 switch (reg) {
32 case RN5T618_WATCHDOGCNT:
33 case RN5T618_DCIRQ:
34 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
35 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
36 case RN5T618_IR_GPR:
37 case RN5T618_IR_GPF:
38 case RN5T618_MON_IOIN:
39 case RN5T618_INTMON:
40 return true;
41 default:
42 return false;
43 }
44}
45
46static const struct regmap_config rn5t618_regmap_config = {
47 .reg_bits = 8,
48 .val_bits = 8,
49 .volatile_reg = rn5t618_volatile_reg,
50 .max_register = RN5T618_MAX_REG,
51 .cache_type = REGCACHE_RBTREE,
52};
53
54static struct rn5t618 *rn5t618_pm_power_off;
55static struct notifier_block rn5t618_restart_handler;
56
57static void rn5t618_trigger_poweroff_sequence(bool repower)
58{
59
60 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
61 RN5T618_REPCNT_REPWRON,
62 repower ? RN5T618_REPCNT_REPWRON : 0);
63
64 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
65 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
66}
67
68static void rn5t618_power_off(void)
69{
70 rn5t618_trigger_poweroff_sequence(false);
71}
72
73static int rn5t618_restart(struct notifier_block *this,
74 unsigned long mode, void *cmd)
75{
76 rn5t618_trigger_poweroff_sequence(true);
77
78
79
80
81
82 mdelay(1);
83
84 return NOTIFY_DONE;
85}
86
87static const struct of_device_id rn5t618_of_match[] = {
88 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
89 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
90 { }
91};
92MODULE_DEVICE_TABLE(of, rn5t618_of_match);
93
94static int rn5t618_i2c_probe(struct i2c_client *i2c,
95 const struct i2c_device_id *id)
96{
97 const struct of_device_id *of_id;
98 struct rn5t618 *priv;
99 int ret;
100
101 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
102 if (!of_id) {
103 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
104 return -EINVAL;
105 }
106
107 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
108 if (!priv)
109 return -ENOMEM;
110
111 i2c_set_clientdata(i2c, priv);
112 priv->variant = (long)of_id->data;
113
114 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
115 if (IS_ERR(priv->regmap)) {
116 ret = PTR_ERR(priv->regmap);
117 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
118 return ret;
119 }
120
121 ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
122 ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
123 if (ret) {
124 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
125 return ret;
126 }
127
128 rn5t618_pm_power_off = priv;
129 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
130 if (!pm_power_off)
131 pm_power_off = rn5t618_power_off;
132 else
133 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
134 }
135
136 rn5t618_restart_handler.notifier_call = rn5t618_restart;
137 rn5t618_restart_handler.priority = 192;
138
139 ret = register_restart_handler(&rn5t618_restart_handler);
140 if (ret) {
141 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
142 return ret;
143 }
144
145 return 0;
146}
147
148static int rn5t618_i2c_remove(struct i2c_client *i2c)
149{
150 struct rn5t618 *priv = i2c_get_clientdata(i2c);
151
152 if (priv == rn5t618_pm_power_off) {
153 rn5t618_pm_power_off = NULL;
154 pm_power_off = NULL;
155 }
156
157 return 0;
158}
159
160static const struct i2c_device_id rn5t618_i2c_id[] = {
161 { }
162};
163MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
164
165static struct i2c_driver rn5t618_i2c_driver = {
166 .driver = {
167 .name = "rn5t618",
168 .of_match_table = of_match_ptr(rn5t618_of_match),
169 },
170 .probe = rn5t618_i2c_probe,
171 .remove = rn5t618_i2c_remove,
172 .id_table = rn5t618_i2c_id,
173};
174
175module_i2c_driver(rn5t618_i2c_driver);
176
177MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
178MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
179MODULE_LICENSE("GPL v2");
180
