src/drivers/gfx/generic/generic.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpigen.h>
   4 #include <device/device.h>
   5 #include <device/pci.h>
   6 #include <device/pci_ids.h>
   7
   8 #include "chip.h"
   9
  10 #define ACPI_DSM_PRIVACY_SCREEN_UUID    "C7033113-8720-4CEB-9090-9D52B3E52D73"
  11
  12 #define ACPI_METHOD_EPS_PRESENT         "EPSP"
  13 #define ACPI_METHOD_EPS_STATE           "EPSS"
  14 #define ACPI_METHOD_EPS_ENABLE          "EPSE"
  15 #define ACPI_METHOD_EPS_DISABLE         "EPSD"
  16
  17 static void privacy_screen_detect_cb(void *arg)
  18 {
  19         struct drivers_gfx_generic_privacy_screen_config *config = arg;
  20
  21         acpigen_write_store();
  22         acpigen_emit_namestring(config->detect_function);
  23         acpigen_emit_byte(LOCAL2_OP);
  24         acpigen_write_if_lequal_op_int(LOCAL2_OP, 1);
  25         acpigen_write_return_singleton_buffer(0xF);
  26         acpigen_pop_len();
  27 }
  28 static void privacy_screen_get_status_cb(void *arg)
  29 {
  30         struct drivers_gfx_generic_privacy_screen_config *config = arg;
  31
  32         acpigen_emit_byte(RETURN_OP);
  33         acpigen_emit_namestring(config->status_function);
  34 }
  35 static void privacy_screen_enable_cb(void *arg)
  36 {
  37         struct drivers_gfx_generic_privacy_screen_config *config = arg;
  38
  39         acpigen_emit_namestring(config->enable_function);
  40 }
  41 static void privacy_screen_disable_cb(void *arg)
  42 {
  43         struct drivers_gfx_generic_privacy_screen_config *config = arg;
  44
  45         acpigen_emit_namestring(config->disable_function);
  46 }
  47
  48 static void (*privacy_screen_callbacks[])(void *) = {
  49         privacy_screen_detect_cb,
  50         privacy_screen_get_status_cb,
  51         privacy_screen_enable_cb,
  52         privacy_screen_disable_cb,
  53 };
  54
  55 static void privacy_gpio_acpigen(struct acpi_gpio *gpio)
  56 {
  57         /* EPS Present */
  58         acpigen_write_method(ACPI_METHOD_EPS_PRESENT, 0);
  59         acpigen_write_return_byte(1);
  60         acpigen_pop_len();
  61
  62         /* EPS State */
  63         acpigen_write_method(ACPI_METHOD_EPS_STATE, 0);
  64         acpigen_get_rx_gpio(gpio);
  65         acpigen_emit_byte(RETURN_OP);
  66         acpigen_emit_byte(LOCAL0_OP);
  67         acpigen_pop_len();
  68
  69         /* EPS Enable */
  70         acpigen_write_method(ACPI_METHOD_EPS_ENABLE, 0);
  71         acpigen_enable_tx_gpio(gpio);
  72         acpigen_pop_len();
  73
  74         /* EPS Disable */
  75         acpigen_write_method(ACPI_METHOD_EPS_DISABLE, 0);
  76         acpigen_disable_tx_gpio(gpio);
  77         acpigen_pop_len();
  78 }
  79
  80 static void gfx_fill_privacy_screen_dsm(
  81                 struct drivers_gfx_generic_privacy_screen_config *privacy)
  82 {
  83         if (!privacy->enabled)
  84                 return;
  85
  86         /* Populate ACPI methods, if EPS controlled via gpio */
  87         if (privacy->gpio.pin_count == 1) {
  88                 privacy_gpio_acpigen(&privacy->gpio);
  89                 privacy->detect_function = ACPI_METHOD_EPS_PRESENT;
  90                 privacy->status_function = ACPI_METHOD_EPS_STATE;
  91                 privacy->enable_function = ACPI_METHOD_EPS_ENABLE;
  92                 privacy->disable_function = ACPI_METHOD_EPS_DISABLE;
  93         }
  94
  95         acpigen_write_dsm(ACPI_DSM_PRIVACY_SCREEN_UUID,
  96                 privacy_screen_callbacks,
  97                 ARRAY_SIZE(privacy_screen_callbacks),
  98                 privacy);
  99 }
 100
 101 static void gfx_fill_ssdt_generator(const struct device *dev)
 102 {
 103         size_t i;
 104         struct drivers_gfx_generic_config *config = dev->chip_info;
 105
 106         const char *scope = acpi_device_scope(dev);
 107
 108         if (!scope)
 109                 return;
 110
 111         acpigen_write_scope(scope);
 112
 113         /* Method (_DOD, 0) */
 114         acpigen_write_method("_DOD", 0);
 115         acpigen_emit_byte(RETURN_OP);
 116         acpigen_write_package(config->device_count);
 117         for (i = 0; i < config->device_count; i++)
 118                 acpigen_write_dword(config->device[i].addr);
 119         acpigen_pop_len(); /* End Package. */
 120         acpigen_pop_len(); /* End Method. */
 121
 122         for (i = 0; i < config->device_count; i++) {
 123                 acpigen_write_device(config->device[i].name);
 124                 if (config->device[i].hid)
 125                         acpigen_write_name_string("_HID", config->device[i].hid);
 126                 else
 127                         acpigen_write_name_integer("_ADR", config->device[i].addr);
 128
 129                 acpigen_write_name_integer("_STA", 0xF);
 130                 gfx_fill_privacy_screen_dsm(&config->device[i].privacy);
 131                 acpigen_pop_len(); /* Device */
 132         }
 133         acpigen_pop_len(); /* Scope */
 134 }
 135
 136 static const char *gfx_acpi_name(const struct device *dev)
 137 {
 138         struct drivers_gfx_generic_config *config = dev->chip_info;
 139
 140         return config->name ? : "GFX0";
 141 }
 142
 143 static struct device_operations gfx_ops = {
 144         .acpi_name      = gfx_acpi_name,
 145         .acpi_fill_ssdt = gfx_fill_ssdt_generator,
 146 };
 147
 148 static void gfx_enable(struct device *dev)
 149 {
 150         struct drivers_gfx_generic_config *config = dev->chip_info;
 151
 152         if (!config || !dev->enabled)
 153                 return;
 154
 155         dev->ops = &gfx_ops;
 156 }
 157
 158 struct chip_operations drivers_gfx_generic_ops = {
 159         CHIP_NAME("Generic Graphics Device")
 160         .enable_dev = gfx_enable
 161 };