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/i2c.h>
11 #include <linux/input.h>
12 #include <linux/interrupt.h>
13 #include <linux/mfd/rohm-bd718x7.h>
14 #include <linux/mfd/core.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/regmap.h>
18 #include <linux/types.h>
19
20 #include "rohm-pwrbutton.h"
21
22 static struct mfd_cell bd71837_mfd_cells[] = {
23 { .name = "bd71837-clk", },
24 { .name = "bd71837-pmic", },
25 };
26
27 static struct mfd_cell bd71847_mfd_cells[] = {
28 { .name = "bd71847-clk", },
29 { .name = "bd71847-pmic", },
30 };
31
32 static const struct regmap_irq bd718xx_irqs[] = {
33 REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
34 REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
35 REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
36 REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
37 REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
38 REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
39 REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
40 };
41
42 static const struct regmap_irq_chip bd718xx_irq_chip = {
43 .name = "bd718xx-irq",
44 .irqs = bd718xx_irqs,
45 .num_irqs = ARRAY_SIZE(bd718xx_irqs),
46 .num_regs = 1,
47 .irq_reg_stride = 1,
48 .status_base = BD718XX_REG_IRQ,
49 .mask_base = BD718XX_REG_MIRQ,
50 .ack_base = BD718XX_REG_IRQ,
51 .init_ack_masked = true,
52 };
53
54 static const struct regmap_range pmic_status_range[] = {
55 regmap_reg_range(BD718XX_REG_IRQ, BD718XX_REG_POW_STATE),
56 };
57
58 static const struct regmap_access_table volatile_regs = {
59 .yes_ranges = &pmic_status_range[0],
60 .n_yes_ranges = ARRAY_SIZE(pmic_status_range),
61 };
62
63 static const struct regmap_config bd718xx_regmap_config = {
64 .reg_bits = 8,
65 .val_bits = 8,
66 .volatile_table = &volatile_regs,
67 .max_register = BD718XX_MAX_REGISTER - 1,
68 .cache_type = REGCACHE_MAPLE,
69 };
70
bd718xx_init_press_duration(struct regmap * regmap,struct device * dev)71 static int bd718xx_init_press_duration(struct regmap *regmap,
72 struct device *dev)
73 {
74 u32 short_press_ms, long_press_ms;
75 u32 short_press_value, long_press_value;
76 int ret;
77
78 ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
79 &short_press_ms);
80 if (!ret) {
81 short_press_value = min(15u, (short_press_ms + 250) / 500);
82 ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
83 BD718XX_PWRBTN_PRESS_DURATION_MASK,
84 short_press_value);
85 if (ret) {
86 dev_err(dev, "Failed to init pwron short press\n");
87 return ret;
88 }
89 }
90
91 ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
92 &long_press_ms);
93 if (!ret) {
94 long_press_value = min(15u, (long_press_ms + 500) / 1000);
95 ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
96 BD718XX_PWRBTN_PRESS_DURATION_MASK,
97 long_press_value);
98 if (ret) {
99 dev_err(dev, "Failed to init pwron long press\n");
100 return ret;
101 }
102 }
103
104 return 0;
105 }
106
107
108
bd718xx_i2c_probe(struct i2c_client * i2c)109 static int bd718xx_i2c_probe(struct i2c_client *i2c)
110 {
111 struct regmap *regmap;
112 struct regmap_irq_chip_data *irq_data;
113 struct irq_domain *irq_domain;
114 int ret;
115 unsigned int chip_type;
116 struct mfd_cell *mfd;
117 int cells;
118
119 if (!i2c->irq) {
120 dev_err(&i2c->dev, "No IRQ configured\n");
121 return -EINVAL;
122 }
123 chip_type = (unsigned int)(uintptr_t)
124 of_device_get_match_data(&i2c->dev);
125 switch (chip_type) {
126 case ROHM_CHIP_TYPE_BD71837:
127 mfd = bd71837_mfd_cells;
128 cells = ARRAY_SIZE(bd71837_mfd_cells);
129 break;
130 case ROHM_CHIP_TYPE_BD71847:
131 mfd = bd71847_mfd_cells;
132 cells = ARRAY_SIZE(bd71847_mfd_cells);
133 break;
134 default:
135 dev_err(&i2c->dev, "Unknown device type");
136 return -EINVAL;
137 }
138
139 regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
140 if (IS_ERR(regmap))
141 return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
142 "regmap initialization failed\n");
143
144 ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
145 IRQF_ONESHOT, 0, &bd718xx_irq_chip,
146 &irq_data);
147 if (ret)
148 return dev_err_probe(&i2c->dev, ret, "Failed to add irq_chip\n");
149
150 ret = bd718xx_init_press_duration(regmap, &i2c->dev);
151 if (ret)
152 return ret;
153
154 irq_domain = regmap_irq_get_domain(irq_data);
155
156 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
157 mfd, cells, NULL, 0, irq_domain);
158 if (ret)
159 return dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
160
161 ret = rohm_register_pwrbutton(&i2c->dev, BD718XX_INT_PWRBTN_S,
162 "bd718xx-pwrkey", false, irq_domain);
163 if (ret)
164 return ret;
165
166 return 0;
167 }
168
169 static const struct of_device_id bd718xx_of_match[] = {
170 {
171 .compatible = "rohm,bd71837",
172 .data = (void *)ROHM_CHIP_TYPE_BD71837,
173 },
174 {
175 .compatible = "rohm,bd71847",
176 .data = (void *)ROHM_CHIP_TYPE_BD71847,
177 },
178 {
179 .compatible = "rohm,bd71850",
180 .data = (void *)ROHM_CHIP_TYPE_BD71847,
181 },
182 { }
183 };
184 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
185
186 static struct i2c_driver bd718xx_i2c_driver = {
187 .driver = {
188 .name = "rohm-bd718x7",
189 .of_match_table = bd718xx_of_match,
190 },
191 .probe = bd718xx_i2c_probe,
192 };
193
bd718xx_i2c_init(void)194 static int __init bd718xx_i2c_init(void)
195 {
196 return i2c_add_driver(&bd718xx_i2c_driver);
197 }
198
199 /* Initialise early so consumer devices can complete system boot */
200 subsys_initcall(bd718xx_i2c_init);
201
bd718xx_i2c_exit(void)202 static void __exit bd718xx_i2c_exit(void)
203 {
204 i2c_del_driver(&bd718xx_i2c_driver);
205 }
206 module_exit(bd718xx_i2c_exit);
207
208 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
209 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
210 MODULE_LICENSE("GPL");
211