1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <acpi/acpigen_dsm.h>
4 #include <acpi/acpi_device.h>
5 #include <assert.h>
6 #include <device/device.h>
7 #include <stdio.h>
8
9 #include "chip.h"
10 #include <gpio.h>
11 #include <console/console.h>
12
13 #if CONFIG(HAVE_ACPI_TABLES)
i2c_hid_fill_dsm(const struct device * dev)14 static void i2c_hid_fill_dsm(const struct device *dev)
15 {
16 struct drivers_i2c_hid_config *config = dev->chip_info;
17 struct dsm_i2c_hid_config dsm_config = {
18 .hid_desc_reg_offset = config->hid_desc_reg_offset,
19 };
20
21 acpigen_write_dsm_i2c_hid(&dsm_config);
22 }
23
i2c_hid_fill_ssdt_generator(const struct device * dev)24 static void i2c_hid_fill_ssdt_generator(const struct device *dev)
25 {
26 struct drivers_i2c_hid_config *config = dev->chip_info;
27 config->generic.cid = I2C_HID_CID;
28 i2c_generic_fill_ssdt(dev, &i2c_hid_fill_dsm, &config->generic);
29 }
30
i2c_hid_acpi_name(const struct device * dev)31 static const char *i2c_hid_acpi_name(const struct device *dev)
32 {
33 static char name[5];
34 struct drivers_i2c_hid_config *config = dev->chip_info;
35 if (config->generic.name)
36 return config->generic.name;
37
38 snprintf(name, sizeof(name), "H%03.3X", dev->path.i2c.device);
39 name[4] = '\0';
40 return name;
41 }
42 #endif
43
44 static struct device_operations i2c_hid_ops = {
45 .read_resources = noop_read_resources,
46 .set_resources = noop_set_resources,
47 #if CONFIG(HAVE_ACPI_TABLES)
48 .acpi_name = i2c_hid_acpi_name,
49 .acpi_fill_ssdt = i2c_hid_fill_ssdt_generator,
50 #endif
51 };
52
i2c_hid_enable(struct device * dev)53 static void i2c_hid_enable(struct device *dev)
54 {
55 struct drivers_i2c_hid_config *config = dev->chip_info;
56
57 if (!config)
58 return;
59
60 /* Check if device is present by reading GPIO */
61 if (config->generic.device_present_gpio) {
62 int present = gpio_get(config->generic.device_present_gpio);
63 present ^= config->generic.device_present_gpio_invert;
64
65 printk(BIOS_INFO, "%s is %spresent\n",
66 dev->chip_ops->name, present ? "" : "not ");
67
68 if (!present) {
69 dev->enabled = 0;
70 return;
71 }
72 }
73
74 /*
75 * Ensure that I2C HID devices use level triggered interrupts as per ACPI
76 * I2C HID requirement. Check interrupt and GPIO interrupt.
77 */
78 if ((!config->generic.irq_gpio.pin_count &&
79 config->generic.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED) ||
80 (config->generic.irq_gpio.pin_count &&
81 config->generic.irq_gpio.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED)) {
82 printk(BIOS_ERR, "%s IRQ is not level triggered.\n", config->generic.hid);
83 BUG();
84 }
85
86 dev->ops = &i2c_hid_ops;
87
88 if (config && config->generic.desc) {
89 dev->name = config->generic.desc;
90 }
91 }
92
93 struct chip_operations drivers_i2c_hid_ops = {
94 .name = "I2C HID Device",
95 .enable_dev = i2c_hid_enable
96 };
97