1
2
3
4
5
6
7
8
9#include <linux/delay.h>
10#include <linux/i2c.h>
11#include <linux/interrupt.h>
12#include <linux/irq.h>
13#include <linux/mfd/core.h>
14#include <linux/mfd/rn5t618.h>
15#include <linux/module.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/reboot.h>
19#include <linux/regmap.h>
20
21static const struct mfd_cell rn5t618_cells[] = {
22 { .name = "rn5t618-regulator" },
23 { .name = "rn5t618-wdt" },
24};
25
26static const struct mfd_cell rc5t619_cells[] = {
27 { .name = "rn5t618-adc" },
28 { .name = "rn5t618-regulator" },
29 { .name = "rc5t619-rtc" },
30 { .name = "rn5t618-wdt" },
31};
32
33static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
34{
35 switch (reg) {
36 case RN5T618_WATCHDOGCNT:
37 case RN5T618_DCIRQ:
38 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
39 case RN5T618_ADCCNT3:
40 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
41 case RN5T618_IR_GPR:
42 case RN5T618_IR_GPF:
43 case RN5T618_MON_IOIN:
44 case RN5T618_INTMON:
45 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
46 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
47 case RN5T618_CHGSTATE:
48 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
49 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
50 return true;
51 default:
52 return false;
53 }
54}
55
56static const struct regmap_config rn5t618_regmap_config = {
57 .reg_bits = 8,
58 .val_bits = 8,
59 .volatile_reg = rn5t618_volatile_reg,
60 .max_register = RN5T618_MAX_REG,
61 .cache_type = REGCACHE_RBTREE,
62};
63
64static const struct regmap_irq rc5t619_irqs[] = {
65 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
66 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
67 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
68 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
69 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
70 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
71};
72
73static const struct regmap_irq_chip rc5t619_irq_chip = {
74 .name = "rc5t619",
75 .irqs = rc5t619_irqs,
76 .num_irqs = ARRAY_SIZE(rc5t619_irqs),
77 .num_regs = 1,
78 .status_base = RN5T618_INTMON,
79 .mask_base = RN5T618_INTEN,
80 .mask_invert = true,
81};
82
83static struct i2c_client *rn5t618_pm_power_off;
84static struct notifier_block rn5t618_restart_handler;
85
86static int rn5t618_irq_init(struct rn5t618 *rn5t618)
87{
88 const struct regmap_irq_chip *irq_chip = NULL;
89 int ret;
90
91 if (!rn5t618->irq)
92 return 0;
93
94 switch (rn5t618->variant) {
95 case RC5T619:
96 irq_chip = &rc5t619_irq_chip;
97 break;
98 default:
99 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
100 (int)rn5t618->variant);
101 return -ENOENT;
102 }
103
104 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
105 rn5t618->irq,
106 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
107 0, irq_chip, &rn5t618->irq_data);
108 if (ret)
109 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
110
111 return ret;
112}
113
114static void rn5t618_trigger_poweroff_sequence(bool repower)
115{
116 int ret;
117
118
119 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
120 if (ret < 0)
121 goto err;
122
123 ret &= ~RN5T618_REPCNT_REPWRON;
124 if (repower)
125 ret |= RN5T618_REPCNT_REPWRON;
126
127 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
128 RN5T618_REPCNT, (u8)ret);
129 if (ret < 0)
130 goto err;
131
132
133 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
134 if (ret < 0)
135 goto err;
136
137 ret |= RN5T618_SLPCNT_SWPWROFF;
138
139 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
140 RN5T618_SLPCNT, (u8)ret);
141 if (ret < 0)
142 goto err;
143
144 return;
145
146err:
147 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
148}
149
150static void rn5t618_power_off(void)
151{
152 rn5t618_trigger_poweroff_sequence(false);
153}
154
155static int rn5t618_restart(struct notifier_block *this,
156 unsigned long mode, void *cmd)
157{
158 rn5t618_trigger_poweroff_sequence(true);
159
160
161
162
163
164 mdelay(1);
165
166 return NOTIFY_DONE;
167}
168
169static const struct of_device_id rn5t618_of_match[] = {
170 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
171 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
172 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
173 { }
174};
175MODULE_DEVICE_TABLE(of, rn5t618_of_match);
176
177static int rn5t618_i2c_probe(struct i2c_client *i2c)
178{
179 const struct of_device_id *of_id;
180 struct rn5t618 *priv;
181 int ret;
182
183 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
184 if (!of_id) {
185 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
186 return -EINVAL;
187 }
188
189 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
190 if (!priv)
191 return -ENOMEM;
192
193 i2c_set_clientdata(i2c, priv);
194 priv->variant = (long)of_id->data;
195 priv->irq = i2c->irq;
196 priv->dev = &i2c->dev;
197
198 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
199 if (IS_ERR(priv->regmap)) {
200 ret = PTR_ERR(priv->regmap);
201 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
202 return ret;
203 }
204
205 if (priv->variant == RC5T619)
206 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
207 rc5t619_cells,
208 ARRAY_SIZE(rc5t619_cells),
209 NULL, 0, NULL);
210 else
211 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
212 rn5t618_cells,
213 ARRAY_SIZE(rn5t618_cells),
214 NULL, 0, NULL);
215 if (ret) {
216 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
217 return ret;
218 }
219
220 rn5t618_pm_power_off = i2c;
221 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
222 if (!pm_power_off)
223 pm_power_off = rn5t618_power_off;
224 else
225 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
226 }
227
228 rn5t618_restart_handler.notifier_call = rn5t618_restart;
229 rn5t618_restart_handler.priority = 192;
230
231 ret = register_restart_handler(&rn5t618_restart_handler);
232 if (ret) {
233 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
234 return ret;
235 }
236
237 return rn5t618_irq_init(priv);
238}
239
240static int rn5t618_i2c_remove(struct i2c_client *i2c)
241{
242 if (i2c == rn5t618_pm_power_off) {
243 rn5t618_pm_power_off = NULL;
244 pm_power_off = NULL;
245 }
246
247 unregister_restart_handler(&rn5t618_restart_handler);
248
249 return 0;
250}
251
252static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
253{
254 struct rn5t618 *priv = dev_get_drvdata(dev);
255
256 if (priv->irq)
257 disable_irq(priv->irq);
258
259 return 0;
260}
261
262static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
263{
264 struct rn5t618 *priv = dev_get_drvdata(dev);
265
266 if (priv->irq)
267 enable_irq(priv->irq);
268
269 return 0;
270}
271
272static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
273 rn5t618_i2c_suspend,
274 rn5t618_i2c_resume);
275
276static struct i2c_driver rn5t618_i2c_driver = {
277 .driver = {
278 .name = "rn5t618",
279 .of_match_table = of_match_ptr(rn5t618_of_match),
280 .pm = &rn5t618_i2c_dev_pm_ops,
281 },
282 .probe_new = rn5t618_i2c_probe,
283 .remove = rn5t618_i2c_remove,
284};
285
286module_i2c_driver(rn5t618_i2c_driver);
287
288MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
289MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
290MODULE_LICENSE("GPL v2");
291
