1// SPDX-License-Identifier: GPL-2.0-or-later
  2//
  3// Copyright (C) 2018 ROHM Semiconductors
  4//
  5// ROHM BD71837MWV and BD71847MWV PMIC driver
  6//
  7// Datasheet for BD71837MWV available from
  8// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
  9
 10#include <linux/gpio_keys.h>
 11#include <linux/i2c.h>
 12#include <linux/input.h>
 13#include <linux/interrupt.h>
 14#include <linux/mfd/rohm-bd718x7.h>
 15#include <linux/mfd/core.h>
 16#include <linux/module.h>
 17#include <linux/of_device.h>
 18#include <linux/regmap.h>
 19#include <linux/types.h>
 20
 21static struct gpio_keys_button button = {
 22	.code = KEY_POWER,
 23	.gpio = -1,
 24	.type = EV_KEY,
 25};
 26
 27static struct gpio_keys_platform_data bd718xx_powerkey_data = {
 28	.buttons = &button,
 29	.nbuttons = 1,
 30	.name = "bd718xx-pwrkey",
 31};
 32
 33static struct mfd_cell bd71837_mfd_cells[] = {
 34	{
 35		.name = "gpio-keys",
 36		.platform_data = &bd718xx_powerkey_data,
 37		.pdata_size = sizeof(bd718xx_powerkey_data),
 38	},
 39	{ .name = "bd71837-clk", },
 40	{ .name = "bd71837-pmic", },
 41};
 42
 43static struct mfd_cell bd71847_mfd_cells[] = {
 44	{
 45		.name = "gpio-keys",
 46		.platform_data = &bd718xx_powerkey_data,
 47		.pdata_size = sizeof(bd718xx_powerkey_data),
 48	},
 49	{ .name = "bd71847-clk", },
 50	{ .name = "bd71847-pmic", },
 51};
 52
 53static const struct regmap_irq bd718xx_irqs[] = {
 54	REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
 55	REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
 56	REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
 57	REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
 58	REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
 59	REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
 60	REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
 61};
 62
 63static struct regmap_irq_chip bd718xx_irq_chip = {
 64	.name = "bd718xx-irq",
 65	.irqs = bd718xx_irqs,
 66	.num_irqs = ARRAY_SIZE(bd718xx_irqs),
 67	.num_regs = 1,
 68	.irq_reg_stride = 1,
 69	.status_base = BD718XX_REG_IRQ,
 70	.mask_base = BD718XX_REG_MIRQ,
 71	.ack_base = BD718XX_REG_IRQ,
 72	.init_ack_masked = true,
 73	.mask_invert = false,
 74};
 75
 76static const struct regmap_range pmic_status_range = {
 77	.range_min = BD718XX_REG_IRQ,
 78	.range_max = BD718XX_REG_POW_STATE,
 79};
 80
 81static const struct regmap_access_table volatile_regs = {
 82	.yes_ranges = &pmic_status_range,
 83	.n_yes_ranges = 1,
 84};
 85
 86static const struct regmap_config bd718xx_regmap_config = {
 87	.reg_bits = 8,
 88	.val_bits = 8,
 89	.volatile_table = &volatile_regs,
 90	.max_register = BD718XX_MAX_REGISTER - 1,
 91	.cache_type = REGCACHE_RBTREE,
 92};
 93
 94static int bd718xx_init_press_duration(struct bd718xx *bd718xx)
 95{
 96	struct device* dev = bd718xx->chip.dev;
 97	u32 short_press_ms, long_press_ms;
 98	u32 short_press_value, long_press_value;
 99	int ret;
100
101	ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
102				   &short_press_ms);
103	if (!ret) {
104		short_press_value = min(15u, (short_press_ms + 250) / 500);
105		ret = regmap_update_bits(bd718xx->chip.regmap,
106					 BD718XX_REG_PWRONCONFIG0,
107					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
108					 short_press_value);
109		if (ret) {
110			dev_err(dev, "Failed to init pwron short press\n");
111			return ret;
112		}
113	}
114
115	ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
116				   &long_press_ms);
117	if (!ret) {
118		long_press_value = min(15u, (long_press_ms + 500) / 1000);
119		ret = regmap_update_bits(bd718xx->chip.regmap,
120					 BD718XX_REG_PWRONCONFIG1,
121					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
122					 long_press_value);
123		if (ret) {
124			dev_err(dev, "Failed to init pwron long press\n");
125			return ret;
126		}
127	}
128
129	return 0;
130}
131
132static int bd718xx_i2c_probe(struct i2c_client *i2c,
133			    const struct i2c_device_id *id)
134{
135	struct bd718xx *bd718xx;
136	int ret;
137	unsigned int chip_type;
138	struct mfd_cell *mfd;
139	int cells;
140
141	if (!i2c->irq) {
142		dev_err(&i2c->dev, "No IRQ configured\n");
143		return -EINVAL;
144	}
145
146	bd718xx = devm_kzalloc(&i2c->dev, sizeof(struct bd718xx), GFP_KERNEL);
147
148	if (!bd718xx)
149		return -ENOMEM;
150
151	bd718xx->chip_irq = i2c->irq;
152	chip_type = (unsigned int)(uintptr_t)
153		    of_device_get_match_data(&i2c->dev);
154	switch (chip_type) {
155	case ROHM_CHIP_TYPE_BD71837:
156		mfd = bd71837_mfd_cells;
157		cells = ARRAY_SIZE(bd71837_mfd_cells);
158		break;
159	case ROHM_CHIP_TYPE_BD71847:
160		mfd = bd71847_mfd_cells;
161		cells = ARRAY_SIZE(bd71847_mfd_cells);
162		break;
163	default:
164		dev_err(&i2c->dev, "Unknown device type");
165		return -EINVAL;
166	}
167	bd718xx->chip.dev = &i2c->dev;
168	dev_set_drvdata(&i2c->dev, bd718xx);
169
170	bd718xx->chip.regmap = devm_regmap_init_i2c(i2c,
171						    &bd718xx_regmap_config);
172	if (IS_ERR(bd718xx->chip.regmap)) {
173		dev_err(&i2c->dev, "regmap initialization failed\n");
174		return PTR_ERR(bd718xx->chip.regmap);
175	}
176
177	ret = devm_regmap_add_irq_chip(&i2c->dev, bd718xx->chip.regmap,
178				       bd718xx->chip_irq, IRQF_ONESHOT, 0,
179				       &bd718xx_irq_chip, &bd718xx->irq_data);
180	if (ret) {
181		dev_err(&i2c->dev, "Failed to add irq_chip\n");
182		return ret;
183	}
184
185	ret = bd718xx_init_press_duration(bd718xx);
186	if (ret)
187		return ret;
188
189	ret = regmap_irq_get_virq(bd718xx->irq_data, BD718XX_INT_PWRBTN_S);
190
191	if (ret < 0) {
192		dev_err(&i2c->dev, "Failed to get the IRQ\n");
193		return ret;
194	}
195
196	button.irq = ret;
197
198	ret = devm_mfd_add_devices(bd718xx->chip.dev, PLATFORM_DEVID_AUTO,
199				   mfd, cells, NULL, 0,
200				   regmap_irq_get_domain(bd718xx->irq_data));
201	if (ret)
202		dev_err(&i2c->dev, "Failed to create subdevices\n");
203
204	return ret;
205}
206
207static const struct of_device_id bd718xx_of_match[] = {
208	{
209		.compatible = "rohm,bd71837",
210		.data = (void *)ROHM_CHIP_TYPE_BD71837,
211	},
212	{
213		.compatible = "rohm,bd71847",
214		.data = (void *)ROHM_CHIP_TYPE_BD71847,
215	},
216	{
217		.compatible = "rohm,bd71850",
218		.data = (void *)ROHM_CHIP_TYPE_BD71847,
219	},
220	{ }
221};
222MODULE_DEVICE_TABLE(of, bd718xx_of_match);
223
224static struct i2c_driver bd718xx_i2c_driver = {
225	.driver = {
226		.name = "rohm-bd718x7",
227		.of_match_table = bd718xx_of_match,
228	},
229	.probe = bd718xx_i2c_probe,
230};
231
232static int __init bd718xx_i2c_init(void)
233{
234	return i2c_add_driver(&bd718xx_i2c_driver);
235}
236
237/* Initialise early so consumer devices can complete system boot */
238subsys_initcall(bd718xx_i2c_init);
239
240static void __exit bd718xx_i2c_exit(void)
241{
242	i2c_del_driver(&bd718xx_i2c_driver);
243}
244module_exit(bd718xx_i2c_exit);
245
246MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
247MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
248MODULE_LICENSE("GPL");