This source file includes following definitions.
- rn5t618_volatile_reg
- rn5t618_trigger_poweroff_sequence
- rn5t618_power_off
- rn5t618_restart
- rn5t618_i2c_probe
- rn5t618_i2c_remove
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9 #include <linux/delay.h>
10 #include <linux/i2c.h>
11 #include <linux/mfd/core.h>
12 #include <linux/mfd/rn5t618.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/reboot.h>
16 #include <linux/regmap.h>
17
18 static const struct mfd_cell rn5t618_cells[] = {
19 { .name = "rn5t618-regulator" },
20 { .name = "rn5t618-wdt" },
21 };
22
23 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
24 {
25 switch (reg) {
26 case RN5T618_WATCHDOGCNT:
27 case RN5T618_DCIRQ:
28 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
29 case RN5T618_ADCCNT3:
30 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
31 case RN5T618_IR_GPR:
32 case RN5T618_IR_GPF:
33 case RN5T618_MON_IOIN:
34 case RN5T618_INTMON:
35 return true;
36 default:
37 return false;
38 }
39 }
40
41 static const struct regmap_config rn5t618_regmap_config = {
42 .reg_bits = 8,
43 .val_bits = 8,
44 .volatile_reg = rn5t618_volatile_reg,
45 .max_register = RN5T618_MAX_REG,
46 .cache_type = REGCACHE_RBTREE,
47 };
48
49 static struct rn5t618 *rn5t618_pm_power_off;
50 static struct notifier_block rn5t618_restart_handler;
51
52 static void rn5t618_trigger_poweroff_sequence(bool repower)
53 {
54
55 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
56 RN5T618_REPCNT_REPWRON,
57 repower ? RN5T618_REPCNT_REPWRON : 0);
58
59 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
60 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
61 }
62
63 static void rn5t618_power_off(void)
64 {
65 rn5t618_trigger_poweroff_sequence(false);
66 }
67
68 static int rn5t618_restart(struct notifier_block *this,
69 unsigned long mode, void *cmd)
70 {
71 rn5t618_trigger_poweroff_sequence(true);
72
73
74
75
76
77 mdelay(1);
78
79 return NOTIFY_DONE;
80 }
81
82 static const struct of_device_id rn5t618_of_match[] = {
83 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
84 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
85 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
86 { }
87 };
88 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
89
90 static int rn5t618_i2c_probe(struct i2c_client *i2c,
91 const struct i2c_device_id *id)
92 {
93 const struct of_device_id *of_id;
94 struct rn5t618 *priv;
95 int ret;
96
97 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
98 if (!of_id) {
99 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
100 return -EINVAL;
101 }
102
103 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
104 if (!priv)
105 return -ENOMEM;
106
107 i2c_set_clientdata(i2c, priv);
108 priv->variant = (long)of_id->data;
109
110 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
111 if (IS_ERR(priv->regmap)) {
112 ret = PTR_ERR(priv->regmap);
113 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
114 return ret;
115 }
116
117 ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
118 ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
119 if (ret) {
120 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
121 return ret;
122 }
123
124 rn5t618_pm_power_off = priv;
125 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
126 if (!pm_power_off)
127 pm_power_off = rn5t618_power_off;
128 else
129 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
130 }
131
132 rn5t618_restart_handler.notifier_call = rn5t618_restart;
133 rn5t618_restart_handler.priority = 192;
134
135 ret = register_restart_handler(&rn5t618_restart_handler);
136 if (ret) {
137 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
138 return ret;
139 }
140
141 return 0;
142 }
143
144 static int rn5t618_i2c_remove(struct i2c_client *i2c)
145 {
146 struct rn5t618 *priv = i2c_get_clientdata(i2c);
147
148 if (priv == rn5t618_pm_power_off) {
149 rn5t618_pm_power_off = NULL;
150 pm_power_off = NULL;
151 }
152
153 unregister_restart_handler(&rn5t618_restart_handler);
154
155 return 0;
156 }
157
158 static const struct i2c_device_id rn5t618_i2c_id[] = {
159 { }
160 };
161 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
162
163 static struct i2c_driver rn5t618_i2c_driver = {
164 .driver = {
165 .name = "rn5t618",
166 .of_match_table = of_match_ptr(rn5t618_of_match),
167 },
168 .probe = rn5t618_i2c_probe,
169 .remove = rn5t618_i2c_remove,
170 .id_table = rn5t618_i2c_id,
171 };
172
173 module_i2c_driver(rn5t618_i2c_driver);
174
175 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
176 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
177 MODULE_LICENSE("GPL v2");