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.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};
 74
 75static const struct regmap_range pmic_status_range = {
 76	.range_min = BD718XX_REG_IRQ,
 77	.range_max = BD718XX_REG_POW_STATE,
 78};
 79
 80static const struct regmap_access_table volatile_regs = {
 81	.yes_ranges = &pmic_status_range,
 82	.n_yes_ranges = 1,
 83};
 84
 85static const struct regmap_config bd718xx_regmap_config = {
 86	.reg_bits = 8,
 87	.val_bits = 8,
 88	.volatile_table = &volatile_regs,
 89	.max_register = BD718XX_MAX_REGISTER - 1,
 90	.cache_type = REGCACHE_RBTREE,
 91};
 92
 93static int bd718xx_init_press_duration(struct regmap *regmap,
 94				       struct device *dev)
 95{
 96	u32 short_press_ms, long_press_ms;
 97	u32 short_press_value, long_press_value;
 98	int ret;
 99
100	ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
101				   &short_press_ms);
102	if (!ret) {
103		short_press_value = min(15u, (short_press_ms + 250) / 500);
104		ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
105					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
106					 short_press_value);
107		if (ret) {
108			dev_err(dev, "Failed to init pwron short press\n");
109			return ret;
110		}
111	}
112
113	ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
114				   &long_press_ms);
115	if (!ret) {
116		long_press_value = min(15u, (long_press_ms + 500) / 1000);
117		ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
118					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
119					 long_press_value);
120		if (ret) {
121			dev_err(dev, "Failed to init pwron long press\n");
122			return ret;
123		}
124	}
125
126	return 0;
127}
128
129static int bd718xx_i2c_probe(struct i2c_client *i2c)
130{
131	struct regmap *regmap;
132	struct regmap_irq_chip_data *irq_data;
133	int ret;
134	unsigned int chip_type;
135	struct mfd_cell *mfd;
136	int cells;
137
138	if (!i2c->irq) {
139		dev_err(&i2c->dev, "No IRQ configured\n");
140		return -EINVAL;
141	}
142	chip_type = (unsigned int)(uintptr_t)
143		    of_device_get_match_data(&i2c->dev);
144	switch (chip_type) {
145	case ROHM_CHIP_TYPE_BD71837:
146		mfd = bd71837_mfd_cells;
147		cells = ARRAY_SIZE(bd71837_mfd_cells);
148		break;
149	case ROHM_CHIP_TYPE_BD71847:
150		mfd = bd71847_mfd_cells;
151		cells = ARRAY_SIZE(bd71847_mfd_cells);
152		break;
153	default:
154		dev_err(&i2c->dev, "Unknown device type");
155		return -EINVAL;
156	}
157
158	regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
159	if (IS_ERR(regmap))
160		return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
161				     "regmap initialization failed\n");
162
163	ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
164				       IRQF_ONESHOT, 0, &bd718xx_irq_chip,
165				       &irq_data);
166	if (ret)
167		return dev_err_probe(&i2c->dev, ret, "Failed to add irq_chip\n");
168
169	ret = bd718xx_init_press_duration(regmap, &i2c->dev);
170	if (ret)
171		return ret;
172
173	ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
174
175	if (ret < 0)
176		return dev_err_probe(&i2c->dev, ret, "Failed to get the IRQ\n");
177
178	button.irq = ret;
179
180	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
181				   mfd, cells, NULL, 0,
182				   regmap_irq_get_domain(irq_data));
183	if (ret)
184		dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
185
186	return ret;
187}
188
189static const struct of_device_id bd718xx_of_match[] = {
190	{
191		.compatible = "rohm,bd71837",
192		.data = (void *)ROHM_CHIP_TYPE_BD71837,
193	},
194	{
195		.compatible = "rohm,bd71847",
196		.data = (void *)ROHM_CHIP_TYPE_BD71847,
197	},
198	{
199		.compatible = "rohm,bd71850",
200		.data = (void *)ROHM_CHIP_TYPE_BD71847,
201	},
202	{ }
203};
204MODULE_DEVICE_TABLE(of, bd718xx_of_match);
205
206static struct i2c_driver bd718xx_i2c_driver = {
207	.driver = {
208		.name = "rohm-bd718x7",
209		.of_match_table = bd718xx_of_match,
210	},
211	.probe = bd718xx_i2c_probe,
212};
213
214static int __init bd718xx_i2c_init(void)
215{
216	return i2c_add_driver(&bd718xx_i2c_driver);
217}
218
219/* Initialise early so consumer devices can complete system boot */
220subsys_initcall(bd718xx_i2c_init);
221
222static void __exit bd718xx_i2c_exit(void)
223{
224	i2c_del_driver(&bd718xx_i2c_driver);
225}
226module_exit(bd718xx_i2c_exit);
227
228MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
229MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
230MODULE_LICENSE("GPL");