Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Thomas Zimmermann | 3591 | 91.98% | 22 | 68.75% |
Thierry Reding | 255 | 6.53% | 3 | 9.38% |
Dan Carpenter | 38 | 0.97% | 2 | 6.25% |
Hans de Goede | 15 | 0.38% | 1 | 3.12% |
Colin Ian King | 2 | 0.05% | 1 | 3.12% |
Javier Martinez Canillas | 2 | 0.05% | 2 | 6.25% |
Sam Ravnborg | 1 | 0.03% | 1 | 3.12% |
Total | 3904 | 32 |
// SPDX-License-Identifier: GPL-2.0-only #include <linux/clk.h> #include <linux/of_clk.h> #include <linux/minmax.h> #include <linux/of_address.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.h> #include <drm/drm_atomic_state_helper.h> #include <drm/drm_connector.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_damage_helper.h> #include <drm/drm_device.h> #include <drm/drm_drv.h> #include <drm/drm_fbdev_generic.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_plane_helper.h> #include <drm/drm_probe_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 /* * 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); } static struct resource * simplefb_get_memory_of(struct drm_device *dev, struct device_node *of_node) { struct device_node *np; struct resource *res; int err; np = of_parse_phandle(of_node, "memory-region", 0); if (!np) return NULL; res = devm_kzalloc(dev->dev, sizeof(*res), GFP_KERNEL); if (!res) return ERR_PTR(-ENOMEM); err = of_address_to_resource(np, 0, res); if (err) return ERR_PTR(err); if (of_get_property(of_node, "reg", NULL)) drm_warn(dev, "preferring \"memory-region\" over \"reg\" property\n"); return res; } /* * Simple Framebuffer device */ struct simpledrm_device { struct drm_device dev; /* 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 iosys_map screen_base; /* modesetting */ uint32_t formats[8]; size_t nformats; struct drm_plane primary_plane; struct drm_crtc crtc; struct drm_encoder encoder; struct drm_connector connector; }; 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 = to_platform_device(dev->dev); 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 = to_platform_device(dev->dev); 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 /* * Modesetting */ static const uint64_t simpledrm_primary_plane_format_modifiers[] = { DRM_FORMAT_MOD_LINEAR, DRM_FORMAT_MOD_INVALID }; static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane, struct drm_atomic_state *state) { struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane); struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); struct drm_framebuffer *fb = plane_state->fb; struct drm_device *dev = plane->dev; struct simpledrm_device *sdev = simpledrm_device_of_dev(dev); struct drm_atomic_helper_damage_iter iter; struct drm_rect damage; int ret, idx; ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); if (ret) return; if (!drm_dev_enter(dev, &idx)) goto out_drm_gem_fb_end_cpu_access; drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state); drm_atomic_for_each_plane_damage(&iter, &damage) { struct drm_rect dst_clip = plane_state->dst; struct iosys_map dst = sdev->screen_base; if (!drm_rect_intersect(&dst_clip, &damage)) continue; iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip)); drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data, fb, &damage); } drm_dev_exit(idx); out_drm_gem_fb_end_cpu_access: drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); } static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane, struct drm_atomic_state *state) { struct drm_device *dev = plane->dev; struct simpledrm_device *sdev = simpledrm_device_of_dev(dev); int idx; if (!drm_dev_enter(dev, &idx)) return; /* Clear screen to black if disabled */ iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay); drm_dev_exit(idx); } static const struct drm_plane_helper_funcs simpledrm_primary_plane_helper_funcs = { DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, .atomic_check = drm_plane_helper_atomic_check, .atomic_update = simpledrm_primary_plane_helper_atomic_update, .atomic_disable = simpledrm_primary_plane_helper_atomic_disable, }; static const struct drm_plane_funcs simpledrm_primary_plane_funcs = { .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, .destroy = drm_plane_cleanup, DRM_GEM_SHADOW_PLANE_FUNCS, }; static enum drm_mode_status simpledrm_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode) { struct simpledrm_device *sdev = simpledrm_device_of_dev(crtc->dev); return drm_crtc_helper_mode_valid_fixed(crtc, mode, &sdev->mode); } /* * The CRTC is always enabled. Screen updates are performed by * the primary plane's atomic_update function. Disabling clears * the screen in the primary plane's atomic_disable function. */ static const struct drm_crtc_helper_funcs simpledrm_crtc_helper_funcs = { .mode_valid = simpledrm_crtc_helper_mode_valid, .atomic_check = drm_crtc_helper_atomic_check, }; static const struct drm_crtc_funcs simpledrm_crtc_funcs = { .reset = drm_atomic_helper_crtc_reset, .destroy = drm_crtc_cleanup, .set_config = drm_atomic_helper_set_config, .page_flip = drm_atomic_helper_page_flip, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, }; static const struct drm_encoder_funcs simpledrm_encoder_funcs = { .destroy = drm_encoder_cleanup, }; static int simpledrm_connector_helper_get_modes(struct drm_connector *connector) { struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev); return drm_connector_helper_get_modes_fixed(connector, &sdev->mode); } 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 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, }; /* * Init / Cleanup */ static struct drm_display_mode simpledrm_mode(unsigned int width, unsigned int height) { /* * Assume a monitor resolution of 96 dpi to * get a somewhat reasonable screen size. */ const struct drm_display_mode mode = { DRM_MODE_INIT(60, width, height, DRM_MODE_RES_MM(width, 96ul), DRM_MODE_RES_MM(height, 96ul)) }; return mode; } static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev) { const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev); struct device_node *of_node = pdev->dev.of_node; struct simpledrm_device *sdev; struct drm_device *dev; int width, height, stride; const struct drm_format_info *format; struct resource *res, *mem = NULL; struct drm_plane *primary_plane; struct drm_crtc *crtc; struct drm_encoder *encoder; struct drm_connector *connector; unsigned long max_width, max_height; size_t nformats; int ret; sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device, dev); if (IS_ERR(sdev)) return ERR_CAST(sdev); dev = &sdev->dev; platform_set_drvdata(pdev, sdev); /* * Hardware settings */ ret = simpledrm_device_init_clocks(sdev); if (ret) return ERR_PTR(ret); ret = simpledrm_device_init_regulators(sdev); if (ret) return ERR_PTR(ret); if (pd) { width = simplefb_get_width_pd(dev, pd); if (width < 0) return ERR_PTR(width); height = simplefb_get_height_pd(dev, pd); if (height < 0) return ERR_PTR(height); stride = simplefb_get_stride_pd(dev, pd); if (stride < 0) return ERR_PTR(stride); format = simplefb_get_format_pd(dev, pd); if (IS_ERR(format)) return ERR_CAST(format); } else if (of_node) { width = simplefb_get_width_of(dev, of_node); if (width < 0) return ERR_PTR(width); height = simplefb_get_height_of(dev, of_node); if (height < 0) return ERR_PTR(height); stride = simplefb_get_stride_of(dev, of_node); if (stride < 0) return ERR_PTR(stride); format = simplefb_get_format_of(dev, of_node); if (IS_ERR(format)) return ERR_CAST(format); mem = simplefb_get_memory_of(dev, of_node); if (IS_ERR(mem)) return ERR_CAST(mem); } else { drm_err(dev, "no simplefb configuration found\n"); return ERR_PTR(-ENODEV); } if (!stride) { stride = drm_format_info_min_pitch(format, 0, width); if (drm_WARN_ON(dev, !stride)) return ERR_PTR(-EINVAL); } sdev->mode = simpledrm_mode(width, height); sdev->format = format; sdev->pitch = stride; drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&sdev->mode)); drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n", &format->format, width, height, stride); /* * Memory management */ if (mem) { void *screen_base; ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem)); if (ret) { drm_err(dev, "could not acquire memory range %pr: %d\n", mem, ret); return ERR_PTR(ret); } drm_dbg(dev, "using system memory framebuffer at %pr\n", mem); screen_base = devm_memremap(dev->dev, mem->start, resource_size(mem), MEMREMAP_WC); if (IS_ERR(screen_base)) return screen_base; iosys_map_set_vaddr(&sdev->screen_base, screen_base); } else { void __iomem *screen_base; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return ERR_PTR(-EINVAL); ret = devm_aperture_acquire_from_firmware(dev, res->start, resource_size(res)); if (ret) { drm_err(dev, "could not acquire memory range %pr: %d\n", &res, ret); return ERR_PTR(ret); } drm_dbg(dev, "using I/O memory framebuffer at %pr\n", res); mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res), drv->name); if (!mem) { /* * We cannot make this fatal. Sometimes this comes from magic * spaces our resource handlers simply don't know about. Use * the I/O-memory resource as-is and try to map that instead. */ drm_warn(dev, "could not acquire memory region %pr\n", res); mem = res; } screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem)); if (!screen_base) return ERR_PTR(-ENOMEM); iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base); } /* * Modesetting */ ret = drmm_mode_config_init(dev); if (ret) return ERR_PTR(ret); max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH); max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT); dev->mode_config.min_width = width; dev->mode_config.max_width = max_width; dev->mode_config.min_height = height; dev->mode_config.max_height = max_height; dev->mode_config.preferred_depth = format->depth; dev->mode_config.funcs = &simpledrm_mode_config_funcs; /* Primary plane */ nformats = drm_fb_build_fourcc_list(dev, &format->format, 1, sdev->formats, ARRAY_SIZE(sdev->formats)); primary_plane = &sdev->primary_plane; ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs, sdev->formats, nformats, simpledrm_primary_plane_format_modifiers, DRM_PLANE_TYPE_PRIMARY, NULL); if (ret) return ERR_PTR(ret); drm_plane_helper_add(primary_plane, &simpledrm_primary_plane_helper_funcs); drm_plane_enable_fb_damage_clips(primary_plane); /* CRTC */ crtc = &sdev->crtc; ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL, &simpledrm_crtc_funcs, NULL); if (ret) return ERR_PTR(ret); drm_crtc_helper_add(crtc, &simpledrm_crtc_helper_funcs); /* Encoder */ encoder = &sdev->encoder; ret = drm_encoder_init(dev, encoder, &simpledrm_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (ret) return ERR_PTR(ret); encoder->possible_crtcs = drm_crtc_mask(crtc); /* Connector */ connector = &sdev->connector; ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs, DRM_MODE_CONNECTOR_Unknown); if (ret) return ERR_PTR(ret); drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs); drm_connector_set_panel_orientation_with_quirk(connector, DRM_MODE_PANEL_ORIENTATION_UNKNOWN, width, height); ret = drm_connector_attach_encoder(connector, encoder); if (ret) return ERR_PTR(ret); drm_mode_config_reset(dev); 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; unsigned int color_mode; 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; color_mode = drm_format_info_bpp(sdev->format, 0); if (color_mode == 16) color_mode = sdev->format->depth; // can be 15 or 16 drm_fbdev_generic_setup(dev, color_mode); 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");
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