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 | |
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(np: dev->of_node, propname: "rohm,short-press-ms" , |
101 | out_value: &short_press_ms); |
102 | if (!ret) { |
103 | short_press_value = min(15u, (short_press_ms + 250) / 500); |
104 | ret = regmap_update_bits(map: regmap, reg: BD718XX_REG_PWRONCONFIG0, |
105 | BD718XX_PWRBTN_PRESS_DURATION_MASK, |
106 | val: 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(np: dev->of_node, propname: "rohm,long-press-ms" , |
114 | out_value: &long_press_ms); |
115 | if (!ret) { |
116 | long_press_value = min(15u, (long_press_ms + 500) / 1000); |
117 | ret = regmap_update_bits(map: regmap, reg: BD718XX_REG_PWRONCONFIG1, |
118 | BD718XX_PWRBTN_PRESS_DURATION_MASK, |
119 | val: 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 | |
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(dev: &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(ptr: regmap)) |
160 | return dev_err_probe(dev: &i2c->dev, err: PTR_ERR(ptr: regmap), |
161 | fmt: "regmap initialization failed\n" ); |
162 | |
163 | ret = devm_regmap_add_irq_chip(dev: &i2c->dev, map: regmap, irq: i2c->irq, |
164 | IRQF_ONESHOT, irq_base: 0, chip: &bd718xx_irq_chip, |
165 | data: &irq_data); |
166 | if (ret) |
167 | return dev_err_probe(dev: &i2c->dev, err: ret, fmt: "Failed to add irq_chip\n" ); |
168 | |
169 | ret = bd718xx_init_press_duration(regmap, dev: &i2c->dev); |
170 | if (ret) |
171 | return ret; |
172 | |
173 | ret = regmap_irq_get_virq(data: irq_data, irq: BD718XX_INT_PWRBTN_S); |
174 | |
175 | if (ret < 0) |
176 | return dev_err_probe(dev: &i2c->dev, err: ret, fmt: "Failed to get the IRQ\n" ); |
177 | |
178 | button.irq = ret; |
179 | |
180 | ret = devm_mfd_add_devices(dev: &i2c->dev, PLATFORM_DEVID_AUTO, |
181 | cells: mfd, n_devs: cells, NULL, irq_base: 0, |
182 | irq_domain: regmap_irq_get_domain(data: irq_data)); |
183 | if (ret) |
184 | dev_err_probe(dev: &i2c->dev, err: ret, fmt: "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 | |
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 | |
222 | static void __exit bd718xx_i2c_exit(void) |
223 | { |
224 | i2c_del_driver(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 | |