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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_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-power" },
29 { .name = "rn5t618-regulator" },
30 { .name = "rc5t619-rtc" },
31 { .name = "rn5t618-wdt" },
32};
33
34static 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
60static 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_RBTREE,
66};
67
68static 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
77static 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 .mask_base = RN5T618_INTEN,
84 .mask_invert = true,
85};
86
87static struct i2c_client *rn5t618_pm_power_off;
88static struct notifier_block rn5t618_restart_handler;
89
90static int rn5t618_irq_init(struct rn5t618 *rn5t618)
91{
92 const struct regmap_irq_chip *irq_chip = NULL;
93 int ret;
94
95 if (!rn5t618->irq)
96 return 0;
97
98 switch (rn5t618->variant) {
99 case RC5T619:
100 irq_chip = &rc5t619_irq_chip;
101 break;
102 default:
103 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
104 (int)rn5t618->variant);
105 return -ENOENT;
106 }
107
108 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
109 rn5t618->irq,
110 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
111 0, irq_chip, &rn5t618->irq_data);
112 if (ret)
113 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
114
115 return ret;
116}
117
118static void rn5t618_trigger_poweroff_sequence(bool repower)
119{
120 int ret;
121
122 /* disable automatic repower-on */
123 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
124 if (ret < 0)
125 goto err;
126
127 ret &= ~RN5T618_REPCNT_REPWRON;
128 if (repower)
129 ret |= RN5T618_REPCNT_REPWRON;
130
131 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
132 RN5T618_REPCNT, (u8)ret);
133 if (ret < 0)
134 goto err;
135
136 /* start power-off sequence */
137 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
138 if (ret < 0)
139 goto err;
140
141 ret |= RN5T618_SLPCNT_SWPWROFF;
142
143 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
144 RN5T618_SLPCNT, (u8)ret);
145 if (ret < 0)
146 goto err;
147
148 return;
149
150err:
151 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
152}
153
154static void rn5t618_power_off(void)
155{
156 rn5t618_trigger_poweroff_sequence(false);
157}
158
159static int rn5t618_restart(struct notifier_block *this,
160 unsigned long mode, void *cmd)
161{
162 rn5t618_trigger_poweroff_sequence(true);
163
164 /*
165 * Re-power factor detection on PMIC side is not instant. 1ms
166 * proved to be enough time until reset takes effect.
167 */
168 mdelay(1);
169
170 return NOTIFY_DONE;
171}
172
173static const struct of_device_id rn5t618_of_match[] = {
174 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
175 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
176 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
177 { }
178};
179MODULE_DEVICE_TABLE(of, rn5t618_of_match);
180
181static int rn5t618_i2c_probe(struct i2c_client *i2c)
182{
183 const struct of_device_id *of_id;
184 struct rn5t618 *priv;
185 int ret;
186
187 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
188 if (!of_id) {
189 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
190 return -EINVAL;
191 }
192
193 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
194 if (!priv)
195 return -ENOMEM;
196
197 i2c_set_clientdata(i2c, priv);
198 priv->variant = (long)of_id->data;
199 priv->irq = i2c->irq;
200 priv->dev = &i2c->dev;
201
202 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
203 if (IS_ERR(priv->regmap)) {
204 ret = PTR_ERR(priv->regmap);
205 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
206 return ret;
207 }
208
209 if (priv->variant == RC5T619)
210 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
211 rc5t619_cells,
212 ARRAY_SIZE(rc5t619_cells),
213 NULL, 0, NULL);
214 else
215 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
216 rn5t618_cells,
217 ARRAY_SIZE(rn5t618_cells),
218 NULL, 0, NULL);
219 if (ret) {
220 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
221 return ret;
222 }
223
224 rn5t618_pm_power_off = i2c;
225 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
226 if (!pm_power_off)
227 pm_power_off = rn5t618_power_off;
228 else
229 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
230 }
231
232 rn5t618_restart_handler.notifier_call = rn5t618_restart;
233 rn5t618_restart_handler.priority = 192;
234
235 ret = register_restart_handler(&rn5t618_restart_handler);
236 if (ret) {
237 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
238 return ret;
239 }
240
241 return rn5t618_irq_init(priv);
242}
243
244static int rn5t618_i2c_remove(struct i2c_client *i2c)
245{
246 if (i2c == rn5t618_pm_power_off) {
247 rn5t618_pm_power_off = NULL;
248 pm_power_off = NULL;
249 }
250
251 unregister_restart_handler(&rn5t618_restart_handler);
252
253 return 0;
254}
255
256static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
257{
258 struct rn5t618 *priv = dev_get_drvdata(dev);
259
260 if (priv->irq)
261 disable_irq(priv->irq);
262
263 return 0;
264}
265
266static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
267{
268 struct rn5t618 *priv = dev_get_drvdata(dev);
269
270 if (priv->irq)
271 enable_irq(priv->irq);
272
273 return 0;
274}
275
276static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
277 rn5t618_i2c_suspend,
278 rn5t618_i2c_resume);
279
280static struct i2c_driver rn5t618_i2c_driver = {
281 .driver = {
282 .name = "rn5t618",
283 .of_match_table = of_match_ptr(rn5t618_of_match),
284 .pm = &rn5t618_i2c_dev_pm_ops,
285 },
286 .probe_new = rn5t618_i2c_probe,
287 .remove = rn5t618_i2c_remove,
288};
289
290module_i2c_driver(rn5t618_i2c_driver);
291
292MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
293MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
294MODULE_LICENSE("GPL v2");