rohm-bd718x7.c

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