summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/rn5t618.c
blob: 232de50562f98f76e1a7026daf9c06b8316c3e66 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
// SPDX-License-Identifier: GPL-2.0-only
/*
 * MFD core driver for Ricoh RN5T618 PMIC
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 * Copyright (C) 2016 Toradex AG
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

static const struct mfd_cell rn5t618_cells[] = {
	{ .name = "rn5t618-regulator" },
	{ .name = "rn5t618-wdt" },
};

static const struct mfd_cell rc5t619_cells[] = {
	{ .name = "rn5t618-adc" },
	{ .name = "rn5t618-regulator" },
	{ .name = "rc5t619-rtc" },
	{ .name = "rn5t618-wdt" },
};

static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RN5T618_WATCHDOGCNT:
	case RN5T618_DCIRQ:
	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	case RN5T618_ADCCNT3:
	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	case RN5T618_IR_GPR:
	case RN5T618_IR_GPF:
	case RN5T618_MON_IOIN:
	case RN5T618_INTMON:
	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config rn5t618_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= rn5t618_volatile_reg,
	.max_register	= RN5T618_MAX_REG,
	.cache_type	= REGCACHE_RBTREE,
};

static const struct regmap_irq rc5t619_irqs[] = {
	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
};

static const struct regmap_irq_chip rc5t619_irq_chip = {
	.name = "rc5t619",
	.irqs = rc5t619_irqs,
	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
	.num_regs = 1,
	.status_base = RN5T618_INTMON,
	.mask_base = RN5T618_INTEN,
	.mask_invert = true,
};

static struct rn5t618 *rn5t618_pm_power_off;
static struct notifier_block rn5t618_restart_handler;

static int rn5t618_irq_init(struct rn5t618 *rn5t618)
{
	const struct regmap_irq_chip *irq_chip = NULL;
	int ret;

	if (!rn5t618->irq)
		return 0;

	switch (rn5t618->variant) {
	case RC5T619:
		irq_chip = &rc5t619_irq_chip;
		break;
	default:
		dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
			(int)rn5t618->variant);
		return -ENOENT;
	}

	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
				       rn5t618->irq,
				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				       0, irq_chip, &rn5t618->irq_data);
	if (ret)
		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");

	return ret;
}

static void rn5t618_trigger_poweroff_sequence(bool repower)
{
	/* disable automatic repower-on */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
			   RN5T618_REPCNT_REPWRON,
			   repower ? RN5T618_REPCNT_REPWRON : 0);
	/* start power-off sequence */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}

static void rn5t618_power_off(void)
{
	rn5t618_trigger_poweroff_sequence(false);
}

static int rn5t618_restart(struct notifier_block *this,
			    unsigned long mode, void *cmd)
{
	rn5t618_trigger_poweroff_sequence(true);

	/*
	 * Re-power factor detection on PMIC side is not instant. 1ms
	 * proved to be enough time until reset takes effect.
	 */
	mdelay(1);

	return NOTIFY_DONE;
}

static const struct of_device_id rn5t618_of_match[] = {
	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
	{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);

static int rn5t618_i2c_probe(struct i2c_client *i2c)
{
	const struct of_device_id *of_id;
	struct rn5t618 *priv;
	int ret;

	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	if (!of_id) {
		dev_err(&i2c->dev, "Failed to find matching DT ID\n");
		return -EINVAL;
	}

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	i2c_set_clientdata(i2c, priv);
	priv->variant = (long)of_id->data;
	priv->irq = i2c->irq;
	priv->dev = &i2c->dev;

	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	if (IS_ERR(priv->regmap)) {
		ret = PTR_ERR(priv->regmap);
		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	if (priv->variant == RC5T619)
		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
					   rc5t619_cells,
					   ARRAY_SIZE(rc5t619_cells),
					   NULL, 0, NULL);
	else
		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
					   rn5t618_cells,
					   ARRAY_SIZE(rn5t618_cells),
					   NULL, 0, NULL);
	if (ret) {
		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
		return ret;
	}

	rn5t618_pm_power_off = priv;
	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
		if (!pm_power_off)
			pm_power_off = rn5t618_power_off;
		else
			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
	}

	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	rn5t618_restart_handler.priority = 192;

	ret = register_restart_handler(&rn5t618_restart_handler);
	if (ret) {
		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
		return ret;
	}

	return rn5t618_irq_init(priv);
}

static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
	struct rn5t618 *priv = i2c_get_clientdata(i2c);

	if (priv == rn5t618_pm_power_off) {
		rn5t618_pm_power_off = NULL;
		pm_power_off = NULL;
	}

	unregister_restart_handler(&rn5t618_restart_handler);

	return 0;
}

static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
		disable_irq(priv->irq);

	return 0;
}

static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
		enable_irq(priv->irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
			rn5t618_i2c_suspend,
			rn5t618_i2c_resume);

static struct i2c_driver rn5t618_i2c_driver = {
	.driver = {
		.name = "rn5t618",
		.of_match_table = of_match_ptr(rn5t618_of_match),
		.pm = &rn5t618_i2c_dev_pm_ops,
	},
	.probe_new = rn5t618_i2c_probe,
	.remove = rn5t618_i2c_remove,
};

module_i2c_driver(rn5t618_i2c_driver);

MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
MODULE_LICENSE("GPL v2");