summaryrefslogtreecommitdiff
path: root/drivers/mfd/rohm-bd718x7.c
blob: 75c8ec659547ca0e234855efff23739513d271bc (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
// SPDX-License-Identifier: GPL-2.0-or-later
//
// Copyright (C) 2018 ROHM Semiconductors
//
// ROHM BD71837MWV PMIC driver
//
// Datasheet available from
// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e

#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/rohm-bd718x7.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/regmap.h>

/*
 * gpio_keys.h requires definiton of bool. It is brought in
 * by above includes. Keep this as last until gpio_keys.h gets fixed.
 */
#include <linux/gpio_keys.h>

static const u8 supported_revisions[] = { 0xA2 /* BD71837 */ };

static struct gpio_keys_button button = {
	.code = KEY_POWER,
	.gpio = -1,
	.type = EV_KEY,
};

static struct gpio_keys_platform_data bd718xx_powerkey_data = {
	.buttons = &button,
	.nbuttons = 1,
	.name = "bd718xx-pwrkey",
};

static struct mfd_cell bd71837_mfd_cells[] = {
	{
		.name = "gpio-keys",
		.platform_data = &bd718xx_powerkey_data,
		.pdata_size = sizeof(bd718xx_powerkey_data),
	},
	{ .name = "bd71837-clk", },
	{ .name = "bd71837-pmic", },
};

static const struct regmap_irq bd71837_irqs[] = {
	REGMAP_IRQ_REG(BD71837_INT_SWRST, 0, BD71837_INT_SWRST_MASK),
	REGMAP_IRQ_REG(BD71837_INT_PWRBTN_S, 0, BD71837_INT_PWRBTN_S_MASK),
	REGMAP_IRQ_REG(BD71837_INT_PWRBTN_L, 0, BD71837_INT_PWRBTN_L_MASK),
	REGMAP_IRQ_REG(BD71837_INT_PWRBTN, 0, BD71837_INT_PWRBTN_MASK),
	REGMAP_IRQ_REG(BD71837_INT_WDOG, 0, BD71837_INT_WDOG_MASK),
	REGMAP_IRQ_REG(BD71837_INT_ON_REQ, 0, BD71837_INT_ON_REQ_MASK),
	REGMAP_IRQ_REG(BD71837_INT_STBY_REQ, 0, BD71837_INT_STBY_REQ_MASK),
};

static struct regmap_irq_chip bd71837_irq_chip = {
	.name = "bd71837-irq",
	.irqs = bd71837_irqs,
	.num_irqs = ARRAY_SIZE(bd71837_irqs),
	.num_regs = 1,
	.irq_reg_stride = 1,
	.status_base = BD71837_REG_IRQ,
	.mask_base = BD71837_REG_MIRQ,
	.ack_base = BD71837_REG_IRQ,
	.init_ack_masked = true,
	.mask_invert = false,
};

static const struct regmap_range pmic_status_range = {
	.range_min = BD71837_REG_IRQ,
	.range_max = BD71837_REG_POW_STATE,
};

static const struct regmap_access_table volatile_regs = {
	.yes_ranges = &pmic_status_range,
	.n_yes_ranges = 1,
};

static const struct regmap_config bd71837_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_table = &volatile_regs,
	.max_register = BD71837_MAX_REGISTER - 1,
	.cache_type = REGCACHE_RBTREE,
};

static int bd71837_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct bd71837 *bd71837;
	int ret, i;
	unsigned int val;

	bd71837 = devm_kzalloc(&i2c->dev, sizeof(struct bd71837), GFP_KERNEL);

	if (!bd71837)
		return -ENOMEM;

	bd71837->chip_irq = i2c->irq;

	if (!bd71837->chip_irq) {
		dev_err(&i2c->dev, "No IRQ configured\n");
		return -EINVAL;
	}

	bd71837->dev = &i2c->dev;
	dev_set_drvdata(&i2c->dev, bd71837);

	bd71837->regmap = devm_regmap_init_i2c(i2c, &bd71837_regmap_config);
	if (IS_ERR(bd71837->regmap)) {
		dev_err(&i2c->dev, "regmap initialization failed\n");
		return PTR_ERR(bd71837->regmap);
	}

	ret = regmap_read(bd71837->regmap, BD71837_REG_REV, &val);
	if (ret) {
		dev_err(&i2c->dev, "Read BD71837_REG_DEVICE failed\n");
		return ret;
	}
	for (i = 0; i < ARRAY_SIZE(supported_revisions); i++)
		if (supported_revisions[i] == val)
			break;

	if (i == ARRAY_SIZE(supported_revisions)) {
		dev_err(&i2c->dev, "Unsupported chip revision\n");
		return -ENODEV;
	}

	ret = devm_regmap_add_irq_chip(&i2c->dev, bd71837->regmap,
				       bd71837->chip_irq, IRQF_ONESHOT, 0,
				       &bd71837_irq_chip, &bd71837->irq_data);
	if (ret) {
		dev_err(&i2c->dev, "Failed to add irq_chip\n");
		return ret;
	}

	/* Configure short press to 10 milliseconds */
	ret = regmap_update_bits(bd71837->regmap,
				 BD71837_REG_PWRONCONFIG0,
				 BD718XX_PWRBTN_PRESS_DURATION_MASK,
				 BD718XX_PWRBTN_SHORT_PRESS_10MS);
	if (ret) {
		dev_err(&i2c->dev,
			"Failed to configure button short press timeout\n");
		return ret;
	}

	/* Configure long press to 10 seconds */
	ret = regmap_update_bits(bd71837->regmap,
				 BD71837_REG_PWRONCONFIG1,
				 BD718XX_PWRBTN_PRESS_DURATION_MASK,
				 BD718XX_PWRBTN_LONG_PRESS_10S);

	if (ret) {
		dev_err(&i2c->dev,
			"Failed to configure button long press timeout\n");
		return ret;
	}

	ret = regmap_irq_get_virq(bd71837->irq_data, BD71837_INT_PWRBTN_S);

	if (ret < 0) {
		dev_err(&i2c->dev, "Failed to get the IRQ\n");
		return ret;
	}

	button.irq = ret;

	ret = devm_mfd_add_devices(bd71837->dev, PLATFORM_DEVID_AUTO,
				   bd71837_mfd_cells,
				   ARRAY_SIZE(bd71837_mfd_cells), NULL, 0,
				   regmap_irq_get_domain(bd71837->irq_data));
	if (ret)
		dev_err(&i2c->dev, "Failed to create subdevices\n");

	return ret;
}

static const struct of_device_id bd71837_of_match[] = {
	{ .compatible = "rohm,bd71837", },
	{ }
};
MODULE_DEVICE_TABLE(of, bd71837_of_match);

static struct i2c_driver bd71837_i2c_driver = {
	.driver = {
		.name = "rohm-bd718x7",
		.of_match_table = bd71837_of_match,
	},
	.probe = bd71837_i2c_probe,
};

static int __init bd71837_i2c_init(void)
{
	return i2c_add_driver(&bd71837_i2c_driver);
}

/* Initialise early so consumer devices can complete system boot */
subsys_initcall(bd71837_i2c_init);

static void __exit bd71837_i2c_exit(void)
{
	i2c_del_driver(&bd71837_i2c_driver);
}
module_exit(bd71837_i2c_exit);

MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("ROHM BD71837 Power Management IC driver");
MODULE_LICENSE("GPL");