1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MFD core driver for Ricoh RN5T618 PMIC
4 *
5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
6 * Copyright (C) 2016 Toradex AG
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.h>
17 #include <linux/platform_device.h>
18 #include <linux/reboot.h>
19 #include <linux/regmap.h>
20
21 static const struct mfd_cell rn5t618_cells[] = {
22 { .name = "rn5t618-regulator" },
23 { .name = "rn5t618-wdt" },
24 };
25
26 static const struct mfd_cell rc5t619_cells[] = {
27 { .name = "rn5t618-adc" },
28 { .name = "rn5t618-power" },
29 { .name = "rn5t618-regulator" },
30 { .name = "rc5t619-rtc" },
31 { .name = "rn5t618-wdt" },
32 };
33
rn5t618_volatile_reg(struct device * dev,unsigned int reg)34 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
35 {
36 switch (reg) {
37 case RN5T618_WATCHDOGCNT:
38 case RN5T618_DCIRQ:
39 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
40 case RN5T618_ADCCNT3:
41 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
42 case RN5T618_IR_GPR:
43 case RN5T618_IR_GPF:
44 case RN5T618_MON_IOIN:
45 case RN5T618_INTMON:
46 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
47 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
48 case RN5T618_CHGCTL1:
49 case RN5T618_REGISET1 ... RN5T618_REGISET2:
50 case RN5T618_CHGSTATE:
51 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
52 case RN5T618_GCHGDET:
53 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
54 return true;
55 default:
56 return false;
57 }
58 }
59
60 static const struct regmap_config rn5t618_regmap_config = {
61 .reg_bits = 8,
62 .val_bits = 8,
63 .volatile_reg = rn5t618_volatile_reg,
64 .max_register = RN5T618_MAX_REG,
65 .cache_type = REGCACHE_MAPLE,
66 };
67
68 static const struct regmap_irq rc5t619_irqs[] = {
69 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
70 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
71 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
72 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
73 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
74 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
75 };
76
77 static const struct regmap_irq_chip rc5t619_irq_chip = {
78 .name = "rc5t619",
79 .irqs = rc5t619_irqs,
80 .num_irqs = ARRAY_SIZE(rc5t619_irqs),
81 .num_regs = 1,
82 .status_base = RN5T618_INTMON,
83 .unmask_base = RN5T618_INTEN,
84 };
85
86 static struct i2c_client *rn5t618_pm_power_off;
87 static struct notifier_block rn5t618_restart_handler;
88
rn5t618_irq_init(struct rn5t618 * rn5t618)89 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
90 {
91 const struct regmap_irq_chip *irq_chip = NULL;
92 int ret;
93
94 if (!rn5t618->irq)
95 return 0;
96
97 switch (rn5t618->variant) {
98 case RC5T619:
99 irq_chip = &rc5t619_irq_chip;
100 break;
101 default:
102 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
103 (int)rn5t618->variant);
104 return -ENOENT;
105 }
106
107 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
108 rn5t618->irq,
109 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
110 0, irq_chip, &rn5t618->irq_data);
111 if (ret)
112 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
113
114 return ret;
115 }
116
rn5t618_trigger_poweroff_sequence(bool repower)117 static void rn5t618_trigger_poweroff_sequence(bool repower)
118 {
119 int ret;
120
121 /* disable automatic repower-on */
122 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
123 if (ret < 0)
124 goto err;
125
126 ret &= ~RN5T618_REPCNT_REPWRON;
127 if (repower)
128 ret |= RN5T618_REPCNT_REPWRON;
129
130 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
131 RN5T618_REPCNT, (u8)ret);
132 if (ret < 0)
133 goto err;
134
135 /* start power-off sequence */
136 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
137 if (ret < 0)
138 goto err;
139
140 ret |= RN5T618_SLPCNT_SWPWROFF;
141
142 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
143 RN5T618_SLPCNT, (u8)ret);
144 if (ret < 0)
145 goto err;
146
147 return;
148
149 err:
150 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
151 }
152
rn5t618_power_off(void)153 static void rn5t618_power_off(void)
154 {
155 rn5t618_trigger_poweroff_sequence(false);
156 }
157
rn5t618_restart(struct notifier_block * this,unsigned long mode,void * cmd)158 static int rn5t618_restart(struct notifier_block *this,
159 unsigned long mode, void *cmd)
160 {
161 rn5t618_trigger_poweroff_sequence(true);
162
163 /*
164 * Re-power factor detection on PMIC side is not instant. 1ms
165 * proved to be enough time until reset takes effect.
166 */
167 mdelay(1);
168
169 return NOTIFY_DONE;
170 }
171
172 static const struct of_device_id rn5t618_of_match[] = {
173 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
174 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
175 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
176 { }
177 };
178 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
179
rn5t618_i2c_probe(struct i2c_client * i2c)180 static int rn5t618_i2c_probe(struct i2c_client *i2c)
181 {
182 struct rn5t618 *priv;
183 int ret;
184
185 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
186 if (!priv)
187 return -ENOMEM;
188
189 i2c_set_clientdata(i2c, priv);
190 priv->variant = (long)i2c_get_match_data(i2c);
191 priv->irq = i2c->irq;
192 priv->dev = &i2c->dev;
193
194 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
195 if (IS_ERR(priv->regmap)) {
196 ret = PTR_ERR(priv->regmap);
197 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
198 return ret;
199 }
200
201 if (priv->variant == RC5T619)
202 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
203 rc5t619_cells,
204 ARRAY_SIZE(rc5t619_cells),
205 NULL, 0, NULL);
206 else
207 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
208 rn5t618_cells,
209 ARRAY_SIZE(rn5t618_cells),
210 NULL, 0, NULL);
211 if (ret) {
212 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
213 return ret;
214 }
215
216 rn5t618_pm_power_off = i2c;
217 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
218 if (!pm_power_off)
219 pm_power_off = rn5t618_power_off;
220 else
221 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
222 }
223
224 rn5t618_restart_handler.notifier_call = rn5t618_restart;
225 rn5t618_restart_handler.priority = 192;
226
227 ret = register_restart_handler(&rn5t618_restart_handler);
228 if (ret) {
229 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
230 return ret;
231 }
232
233 return rn5t618_irq_init(priv);
234 }
235
rn5t618_i2c_remove(struct i2c_client * i2c)236 static void rn5t618_i2c_remove(struct i2c_client *i2c)
237 {
238 if (i2c == rn5t618_pm_power_off) {
239 rn5t618_pm_power_off = NULL;
240 pm_power_off = NULL;
241 }
242
243 unregister_restart_handler(&rn5t618_restart_handler);
244 }
245
rn5t618_i2c_suspend(struct device * dev)246 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
247 {
248 struct rn5t618 *priv = dev_get_drvdata(dev);
249
250 if (priv->irq)
251 disable_irq(priv->irq);
252
253 return 0;
254 }
255
rn5t618_i2c_resume(struct device * dev)256 static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
257 {
258 struct rn5t618 *priv = dev_get_drvdata(dev);
259
260 if (priv->irq)
261 enable_irq(priv->irq);
262
263 return 0;
264 }
265
266 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
267 rn5t618_i2c_suspend,
268 rn5t618_i2c_resume);
269
270 static struct i2c_driver rn5t618_i2c_driver = {
271 .driver = {
272 .name = "rn5t618",
273 .of_match_table = rn5t618_of_match,
274 .pm = &rn5t618_i2c_dev_pm_ops,
275 },
276 .probe = rn5t618_i2c_probe,
277 .remove = rn5t618_i2c_remove,
278 };
279
280 module_i2c_driver(rn5t618_i2c_driver);
281
282 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
283 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
284 MODULE_LICENSE("GPL v2");
285