blob: 08ae66b1e6f571c2ee4d30632e3b95319ee2bf6e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/clk.h>
#include <linux/of_clk.h>
#include <linux/platform_data/simplefb.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_aperture.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#define DRIVER_NAME "simpledrm"
#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
#define DRIVER_DATE "20200625"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
/*
* Assume a monitor resolution of 96 dpi to
* get a somewhat reasonable screen size.
*/
#define RES_MM(d) \
(((d) * 254ul) / (96ul * 10ul))
#define SIMPLEDRM_MODE(hd, vd) \
DRM_SIMPLE_MODE(hd, vd, RES_MM(hd), RES_MM(vd))
/*
* Helpers for simplefb
*/
static int
simplefb_get_validated_int(struct drm_device *dev, const char *name,
uint32_t value)
{
if (value > INT_MAX) {
drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
name, value);
return -EINVAL;
}
return (int)value;
}
static int
simplefb_get_validated_int0(struct drm_device *dev, const char *name,
uint32_t value)
{
if (!value) {
drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
name, value);
return -EINVAL;
}
return simplefb_get_validated_int(dev, name, value);
}
static const struct drm_format_info *
simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
{
static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
const struct simplefb_format *fmt = formats;
const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
const struct drm_format_info *info;
if (!format_name) {
drm_err(dev, "simplefb: missing framebuffer format\n");
return ERR_PTR(-EINVAL);
}
while (fmt < end) {
if (!strcmp(format_name, fmt->name)) {
info = drm_format_info(fmt->fourcc);
if (!info)
return ERR_PTR(-EINVAL);
return info;
}
++fmt;
}
drm_err(dev, "simplefb: unknown framebuffer format %s\n",
format_name);
return ERR_PTR(-EINVAL);
}
static int
simplefb_get_width_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int0(dev, "width", pd->width);
}
static int
simplefb_get_height_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int0(dev, "height", pd->height);
}
static int
simplefb_get_stride_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int(dev, "stride", pd->stride);
}
static const struct drm_format_info *
simplefb_get_format_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_format(dev, pd->format);
}
static int
simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
const char *name, u32 *value)
{
int ret = of_property_read_u32(of_node, name, value);
if (ret)
drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
name, ret);
return ret;
}
static int
simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
const char *name, const char **value)
{
int ret = of_property_read_string(of_node, name, value);
if (ret)
drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
name, ret);
return ret;
}
static int
simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
{
u32 width;
int ret = simplefb_read_u32_of(dev, of_node, "width", &width);
if (ret)
return ret;
return simplefb_get_validated_int0(dev, "width", width);
}
static int
simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
{
u32 height;
int ret = simplefb_read_u32_of(dev, of_node, "height", &height);
if (ret)
return ret;
return simplefb_get_validated_int0(dev, "height", height);
}
static int
simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
{
u32 stride;
int ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
if (ret)
return ret;
return simplefb_get_validated_int(dev, "stride", stride);
}
static const struct drm_format_info *
simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
{
const char *format;
int ret = simplefb_read_string_of(dev, of_node, "format", &format);
if (ret)
return ERR_PTR(ret);
return simplefb_get_validated_format(dev, format);
}
/*
* Simple Framebuffer device
*/
struct simpledrm_device {
struct drm_device dev;
struct platform_device *pdev;
/* clocks */
#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
unsigned int clk_count;
struct clk **clks;
#endif
/* regulators */
#if defined CONFIG_OF && defined CONFIG_REGULATOR
unsigned int regulator_count;
struct regulator **regulators;
#endif
/* simplefb settings */
struct drm_display_mode mode;
const struct drm_format_info *format;
unsigned int pitch;
/* memory management */
struct resource *mem;
void __iomem *screen_base;
/* modesetting */
uint32_t formats[8];
size_t nformats;
struct drm_connector connector;
struct drm_simple_display_pipe pipe;
};
static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
{
return container_of(dev, struct simpledrm_device, dev);
}
/*
* Hardware
*/
#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
/*
* Clock handling code.
*
* Here we handle the clocks property of our "simple-framebuffer" dt node.
* This is necessary so that we can make sure that any clocks needed by
* the display engine that the bootloader set up for us (and for which it
* provided a simplefb dt node), stay up, for the life of the simplefb
* driver.
*
* When the driver unloads, we cleanly disable, and then release the clocks.
*
* We only complain about errors here, no action is taken as the most likely
* error can only happen due to a mismatch between the bootloader which set
* up simplefb, and the clock definitions in the device tree. Chances are
* that there are no adverse effects, and if there are, a clean teardown of
* the fb probe will not help us much either. So just complain and carry on,
* and hope that the user actually gets a working fb at the end of things.
*/
static void simpledrm_device_release_clocks(void *res)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
unsigned int i;
for (i = 0; i < sdev->clk_count; ++i) {
if (sdev->clks[i]) {
clk_disable_unprepare(sdev->clks[i]);
clk_put(sdev->clks[i]);
}
}
}
static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
struct device_node *of_node = pdev->dev.of_node;
struct clk *clock;
unsigned int i;
int ret;
if (dev_get_platdata(&pdev->dev) || !of_node)
return 0;
sdev->clk_count = of_clk_get_parent_count(of_node);
if (!sdev->clk_count)
return 0;
sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]),
GFP_KERNEL);
if (!sdev->clks)
return -ENOMEM;
for (i = 0; i < sdev->clk_count; ++i) {
clock = of_clk_get(of_node, i);
if (IS_ERR(clock)) {
ret = PTR_ERR(clock);
if (ret == -EPROBE_DEFER)
goto err;
drm_err(dev, "clock %u not found: %d\n", i, ret);
continue;
}
ret = clk_prepare_enable(clock);
if (ret) {
drm_err(dev, "failed to enable clock %u: %d\n",
i, ret);
clk_put(clock);
continue;
}
sdev->clks[i] = clock;
}
return devm_add_action_or_reset(&pdev->dev,
simpledrm_device_release_clocks,
sdev);
err:
while (i) {
--i;
if (sdev->clks[i]) {
clk_disable_unprepare(sdev->clks[i]);
clk_put(sdev->clks[i]);
}
}
return ret;
}
#else
static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
{
return 0;
}
#endif
#if defined CONFIG_OF && defined CONFIG_REGULATOR
#define SUPPLY_SUFFIX "-supply"
/*
* Regulator handling code.
*
* Here we handle the num-supplies and vin*-supply properties of our
* "simple-framebuffer" dt node. This is necessary so that we can make sure
* that any regulators needed by the display hardware that the bootloader
* set up for us (and for which it provided a simplefb dt node), stay up,
* for the life of the simplefb driver.
*
* When the driver unloads, we cleanly disable, and then release the
* regulators.
*
* We only complain about errors here, no action is taken as the most likely
* error can only happen due to a mismatch between the bootloader which set
* up simplefb, and the regulator definitions in the device tree. Chances are
* that there are no adverse effects, and if there are, a clean teardown of
* the fb probe will not help us much either. So just complain and carry on,
* and hope that the user actually gets a working fb at the end of things.
*/
static void simpledrm_device_release_regulators(void *res)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
unsigned int i;
for (i = 0; i < sdev->regulator_count; ++i) {
if (sdev->regulators[i]) {
regulator_disable(sdev->regulators[i]);
regulator_put(sdev->regulators[i]);
}
}
}
static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
struct device_node *of_node = pdev->dev.of_node;
struct property *prop;
struct regulator *regulator;
const char *p;
unsigned int count = 0, i = 0;
int ret;
if (dev_get_platdata(&pdev->dev) || !of_node)
return 0;
/* Count the number of regulator supplies */
for_each_property_of_node(of_node, prop) {
p = strstr(prop->name, SUPPLY_SUFFIX);
if (p && p != prop->name)
++count;
}
if (!count)
return 0;
sdev->regulators = drmm_kzalloc(dev,
count * sizeof(sdev->regulators[0]),
GFP_KERNEL);
if (!sdev->regulators)
return -ENOMEM;
for_each_property_of_node(of_node, prop) {
char name[32]; /* 32 is max size of property name */
size_t len;
p = strstr(prop->name, SUPPLY_SUFFIX);
if (!p || p == prop->name)
continue;
len = strlen(prop->name) - strlen(SUPPLY_SUFFIX) + 1;
strscpy(name, prop->name, min(sizeof(name), len));
regulator = regulator_get_optional(&pdev->dev, name);
if (IS_ERR(regulator)) {
ret = PTR_ERR(regulator);
if (ret == -EPROBE_DEFER)
goto err;
drm_err(dev, "regulator %s not found: %d\n",
name, ret);
continue;
}
ret = regulator_enable(regulator);
if (ret) {
drm_err(dev, "failed to enable regulator %u: %d\n",
i, ret);
regulator_put(regulator);
continue;
}
sdev->regulators[i++] = regulator;
}
sdev->regulator_count = i;
return devm_add_action_or_reset(&pdev->dev,
simpledrm_device_release_regulators,
sdev);
err:
while (i) {
--i;
if (sdev->regulators[i]) {
regulator_disable(sdev->regulators[i]);
regulator_put(sdev->regulators[i]);
}
}
return ret;
}
#else
static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
{
return 0;
}
#endif
/*
* Simplefb settings
*/
static struct drm_display_mode simpledrm_mode(unsigned int width,
unsigned int height)
{
struct drm_display_mode mode = { SIMPLEDRM_MODE(width, height) };
mode.clock = 60 /* Hz */ * mode.hdisplay * mode.vdisplay;
drm_mode_set_name(&mode);
return mode;
}
static int simpledrm_device_init_fb(struct simpledrm_device *sdev)
{
int width, height, stride;
const struct drm_format_info *format;
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
struct device_node *of_node = pdev->dev.of_node;
if (pd) {
width = simplefb_get_width_pd(dev, pd);
if (width < 0)
return width;
height = simplefb_get_height_pd(dev, pd);
if (height < 0)
return height;
stride = simplefb_get_stride_pd(dev, pd);
if (stride < 0)
return stride;
format = simplefb_get_format_pd(dev, pd);
if (IS_ERR(format))
return PTR_ERR(format);
} else if (of_node) {
width = simplefb_get_width_of(dev, of_node);
if (width < 0)
return width;
height = simplefb_get_height_of(dev, of_node);
if (height < 0)
return height;
stride = simplefb_get_stride_of(dev, of_node);
if (stride < 0)
return stride;
format = simplefb_get_format_of(dev, of_node);
if (IS_ERR(format))
return PTR_ERR(format);
} else {
drm_err(dev, "no simplefb configuration found\n");
return -ENODEV;
}
sdev->mode = simpledrm_mode(width, height);
sdev->format = format;
sdev->pitch = stride;
drm_dbg_kms(dev, "display mode={" DRM_MODE_FMT "}\n",
DRM_MODE_ARG(&sdev->mode));
drm_dbg_kms(dev,
"framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n",
&format->format, width, height, stride);
return 0;
}
/*
* Memory management
*/
static int simpledrm_device_init_mm(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
struct resource *mem;
void __iomem *screen_base;
int ret;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem)
return -EINVAL;
ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
if (ret) {
drm_err(dev, "could not acquire memory range %pr: error %d\n",
mem, ret);
return ret;
}
screen_base = devm_ioremap_wc(&pdev->dev, mem->start,
resource_size(mem));
if (!screen_base)
return -ENOMEM;
sdev->mem = mem;
sdev->screen_base = screen_base;
return 0;
}
/*
* Modesetting
*/
/*
* Support all formats of simplefb and maybe more; in order
* of preference. The display's update function will do any
* conversion necessary.
*
* TODO: Add blit helpers for remaining formats and uncomment
* constants.
*/
static const uint32_t simpledrm_default_formats[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_RGB565,
//DRM_FORMAT_XRGB1555,
//DRM_FORMAT_ARGB1555,
DRM_FORMAT_RGB888,
//DRM_FORMAT_XRGB2101010,
//DRM_FORMAT_ARGB2101010,
};
static const uint64_t simpledrm_format_modifiers[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID
};
static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &sdev->mode);
if (!mode)
return 0;
if (mode->name[0] == '\0')
drm_mode_set_name(mode);
mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
if (mode->width_mm)
connector->display_info.width_mm = mode->width_mm;
if (mode->height_mm)
connector->display_info.height_mm = mode->height_mm;
return 1;
}
static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
.get_modes = simpledrm_connector_helper_get_modes,
};
static const struct drm_connector_funcs simpledrm_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int
simpledrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
const struct drm_display_mode *mode)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
if (mode->hdisplay != sdev->mode.hdisplay &&
mode->vdisplay != sdev->mode.vdisplay)
return MODE_ONE_SIZE;
else if (mode->hdisplay != sdev->mode.hdisplay)
return MODE_ONE_WIDTH;
else if (mode->vdisplay != sdev->mode.vdisplay)
return MODE_ONE_HEIGHT;
return MODE_OK;
}
static void
simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
struct drm_device *dev = &sdev->dev;
int idx;
if (!fb)
return;
if (!drm_dev_enter(dev, &idx))
return;
drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch,
sdev->format->format, vmap, fb);
drm_dev_exit(idx);
}
static void
simpledrm_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
struct drm_device *dev = &sdev->dev;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
/* Clear screen to black if disabled */
memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay);
drm_dev_exit(idx);
}
static void
simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_plane_state)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
struct drm_plane_state *plane_state = pipe->plane.state;
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
struct drm_framebuffer *fb = plane_state->fb;
struct drm_device *dev = &sdev->dev;
struct drm_rect clip;
int idx;
if (!fb)
return;
if (!drm_atomic_helper_damage_merged(old_plane_state, plane_state, &clip))
return;
if (!drm_dev_enter(dev, &idx))
return;
drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch,
sdev->format->format, vmap, fb, &clip);
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs
simpledrm_simple_display_pipe_funcs = {
.mode_valid = simpledrm_simple_display_pipe_mode_valid,
.enable = simpledrm_simple_display_pipe_enable,
.disable = simpledrm_simple_display_pipe_disable,
.update = simpledrm_simple_display_pipe_update,
DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};
static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static const uint32_t *simpledrm_device_formats(struct simpledrm_device *sdev,
size_t *nformats_out)
{
struct drm_device *dev = &sdev->dev;
size_t i;
if (sdev->nformats)
goto out; /* don't rebuild list on recurring calls */
/* native format goes first */
sdev->formats[0] = sdev->format->format;
sdev->nformats = 1;
/* default formats go second */
for (i = 0; i < ARRAY_SIZE(simpledrm_default_formats); ++i) {
if (simpledrm_default_formats[i] == sdev->format->format)
continue; /* native format already went first */
sdev->formats[sdev->nformats] = simpledrm_default_formats[i];
sdev->nformats++;
}
/*
* TODO: The simpledrm driver converts framebuffers to the native
* format when copying them to device memory. If there are more
* formats listed than supported by the driver, the native format
* is not supported by the conversion helpers. Therefore *only*
* support the native format and add a conversion helper ASAP.
*/
if (drm_WARN_ONCE(dev, i != sdev->nformats,
"format conversion helpers required for %p4cc",
&sdev->format->format)) {
sdev->nformats = 1;
}
out:
*nformats_out = sdev->nformats;
return sdev->formats;
}
static int simpledrm_device_init_modeset(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct drm_display_mode *mode = &sdev->mode;
struct drm_connector *connector = &sdev->connector;
struct drm_simple_display_pipe *pipe = &sdev->pipe;
const uint32_t *formats;
size_t nformats;
int ret;
ret = drmm_mode_config_init(dev);
if (ret)
return ret;
dev->mode_config.min_width = mode->hdisplay;
dev->mode_config.max_width = mode->hdisplay;
dev->mode_config.min_height = mode->vdisplay;
dev->mode_config.max_height = mode->vdisplay;
dev->mode_config.prefer_shadow_fbdev = true;
dev->mode_config.preferred_depth = sdev->format->cpp[0] * 8;
dev->mode_config.funcs = &simpledrm_mode_config_funcs;
ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
DRM_MODE_CONNECTOR_Unknown);
if (ret)
return ret;
drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
formats = simpledrm_device_formats(sdev, &nformats);
ret = drm_simple_display_pipe_init(dev, pipe, &simpledrm_simple_display_pipe_funcs,
formats, nformats, simpledrm_format_modifiers,
connector);
if (ret)
return ret;
drm_mode_config_reset(dev);
return 0;
}
/*
* Init / Cleanup
*/
static struct simpledrm_device *
simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev)
{
struct simpledrm_device *sdev;
int ret;
sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device,
dev);
if (IS_ERR(sdev))
return ERR_CAST(sdev);
sdev->pdev = pdev;
platform_set_drvdata(pdev, sdev);
ret = simpledrm_device_init_clocks(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_init_regulators(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_init_fb(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_init_mm(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_init_modeset(sdev);
if (ret)
return ERR_PTR(ret);
return sdev;
}
/*
* DRM driver
*/
DEFINE_DRM_GEM_FOPS(simpledrm_fops);
static struct drm_driver simpledrm_driver = {
DRM_GEM_SHMEM_DRIVER_OPS,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
.fops = &simpledrm_fops,
};
/*
* Platform driver
*/
static int simpledrm_probe(struct platform_device *pdev)
{
struct simpledrm_device *sdev;
struct drm_device *dev;
int ret;
sdev = simpledrm_device_create(&simpledrm_driver, pdev);
if (IS_ERR(sdev))
return PTR_ERR(sdev);
dev = &sdev->dev;
ret = drm_dev_register(dev, 0);
if (ret)
return ret;
drm_fbdev_generic_setup(dev, 0);
return 0;
}
static int simpledrm_remove(struct platform_device *pdev)
{
struct simpledrm_device *sdev = platform_get_drvdata(pdev);
struct drm_device *dev = &sdev->dev;
drm_dev_unplug(dev);
return 0;
}
static const struct of_device_id simpledrm_of_match_table[] = {
{ .compatible = "simple-framebuffer", },
{ },
};
MODULE_DEVICE_TABLE(of, simpledrm_of_match_table);
static struct platform_driver simpledrm_platform_driver = {
.driver = {
.name = "simple-framebuffer", /* connect to sysfb */
.of_match_table = simpledrm_of_match_table,
},
.probe = simpledrm_probe,
.remove = simpledrm_remove,
};
module_platform_driver(simpledrm_platform_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");