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