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
21 static struct gpio_keys_button button = {
22 .code = KEY_POWER,
23 .gpio = -1,
24 .type = EV_KEY,
25 };
26
27 static struct gpio_keys_platform_data bd718xx_powerkey_data = {
28 .buttons = &button,
29 .nbuttons = 1,
30 .name = "bd718xx-pwrkey",
31 };
32
33 static 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
43 static 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
53 static 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
63 static 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
75 static const struct regmap_range pmic_status_range = {
76 .range_min = BD718XX_REG_IRQ,
77 .range_max = BD718XX_REG_POW_STATE,
78 };
79
80 static const struct regmap_access_table volatile_regs = {
81 .yes_ranges = &pmic_status_range,
82 .n_yes_ranges = 1,
83 };
84
85 static 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
bd718xx_init_press_duration(struct regmap * regmap,struct device * dev)93 static 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
bd718xx_i2c_probe(struct i2c_client * i2c)129 static 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
189 static 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 };
204 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
205
206 static 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
bd718xx_i2c_init(void)214 static 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 */
220 subsys_initcall(bd718xx_i2c_init);
221
bd718xx_i2c_exit(void)222 static void __exit bd718xx_i2c_exit(void)
223 {
224 i2c_del_driver(&bd718xx_i2c_driver);
225 }
226 module_exit(bd718xx_i2c_exit);
227
228 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
229 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
230 MODULE_LICENSE("GPL");
231