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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <drm/clients/drm_client_setup.h>#include <drm/drm_atomic.h>#include <drm/drm_atomic_helper.h>#include <drm/drm_connector.h>#include <drm/drm_damage_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fb_dma_helper.h>#include <drm/drm_fbdev_dma.h>#include <drm/drm_format_helper.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem_atomic_helper.h>#include <drm/drm_gem_dma_helper.h>#include <drm/drm_gem_framebuffer_helper.h>#include <drm/drm_managed.h>#include <drm/drm_modes.h>#include <drm/drm_probe_helper.h>#include <drm/drm_rect.h>#include <linux/bitrev.h>#include <linux/delay.h>#include <linux/gpio/consumer.h>#include <linux/kthread.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/pwm.h>#include <linux/spi/spi.h>
#define SHARP_MODE_PERIOD 8#define SHARP_ADDR_PERIOD 8#define SHARP_DUMMY_PERIOD 8
#define SHARP_MEMORY_DISPLAY_MAINTAIN_MODE 0#define SHARP_MEMORY_DISPLAY_UPDATE_MODE 1#define SHARP_MEMORY_DISPLAY_CLEAR_MODE 4
enum sharp_memory_model { LS010B7DH04, LS011B7DH03, LS012B7DD01, LS013B7DH03, LS013B7DH05, LS018B7DH02, LS027B7DH01, LS027B7DH01A, LS032B7DD02, LS044Q7DH01,};
enum sharp_memory_vcom_mode { SHARP_MEMORY_SOFTWARE_VCOM, SHARP_MEMORY_EXTERNAL_VCOM, SHARP_MEMORY_PWM_VCOM};
struct sharp_memory_device { struct drm_device drm; struct spi_device *spi;
const struct drm_display_mode *mode;
struct drm_crtc crtc; struct drm_plane plane; struct drm_encoder encoder; struct drm_connector connector;
struct gpio_desc *enable_gpio;
struct task_struct *sw_vcom_signal; struct pwm_device *pwm_vcom_signal;
enum sharp_memory_vcom_mode vcom_mode; u8 vcom;
u32 pitch; u32 tx_buffer_size; u8 *tx_buffer;
/* When vcom_mode == "software" a kthread is used to periodically send a * 'maintain display' message over spi. This mutex ensures tx_buffer access * and spi bus usage is synchronized in this case. */ struct mutex tx_mutex;};
static inline int sharp_memory_spi_write(struct spi_device *spi, void *buf, size_t len){ /* Reverse the bit order */ for (u8 *b = buf; b < ((u8 *)buf) + len; ++b) *b = bitrev8(*b);
return spi_write(spi, buf, len);}
static inline struct sharp_memory_device *drm_to_sharp_memory_device(struct drm_device *drm){ return container_of(drm, struct sharp_memory_device, drm);}
DEFINE_DRM_GEM_DMA_FOPS(sharp_memory_fops);
static const struct drm_driver sharp_memory_drm_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, .fops = &sharp_memory_fops, DRM_GEM_DMA_DRIVER_OPS_VMAP, DRM_FBDEV_DMA_DRIVER_OPS, .name = "sharp_memory_display", .desc = "Sharp Display Memory LCD", .major = 1, .minor = 0,};
static inline void sharp_memory_set_tx_buffer_mode(u8 *buffer, u8 mode, u8 vcom){ *buffer = mode | (vcom << 1);}
static inline void sharp_memory_set_tx_buffer_addresses(u8 *buffer, struct drm_rect clip, u32 pitch){ for (u32 line = 0; line < clip.y2; ++line) buffer[line * pitch] = line + 1;}
static void sharp_memory_set_tx_buffer_data(u8 *buffer, struct drm_framebuffer *fb, const struct iosys_map *vmap, struct drm_rect clip, u32 pitch, struct drm_format_conv_state *fmtcnv_state){ int ret; struct iosys_map dst;
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); if (ret) return;
iosys_map_set_vaddr(&dst, buffer);
drm_fb_xrgb8888_to_mono(&dst, &pitch, vmap, fb, &clip, fmtcnv_state);
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);}
static int sharp_memory_update_display(struct sharp_memory_device *smd, struct drm_framebuffer *fb, const struct iosys_map *vmap, struct drm_rect clip, struct drm_format_conv_state *fmtcnv_state){ int ret; u32 pitch = smd->pitch; u8 vcom = smd->vcom; u8 *tx_buffer = smd->tx_buffer; u32 tx_buffer_size = smd->tx_buffer_size;
mutex_lock(&smd->tx_mutex);
/* Populate the transmit buffer with frame data */ sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_UPDATE_MODE, vcom); sharp_memory_set_tx_buffer_addresses(&tx_buffer[1], clip, pitch); sharp_memory_set_tx_buffer_data(&tx_buffer[2], fb, vmap, clip, pitch, fmtcnv_state);
ret = sharp_memory_spi_write(smd->spi, tx_buffer, tx_buffer_size);
mutex_unlock(&smd->tx_mutex);
return ret;}
static int sharp_memory_maintain_display(struct sharp_memory_device *smd){ int ret; u8 vcom = smd->vcom; u8 *tx_buffer = smd->tx_buffer;
mutex_lock(&smd->tx_mutex);
sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_MAINTAIN_MODE, vcom); tx_buffer[1] = 0; /* Write dummy data */ ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2);
mutex_unlock(&smd->tx_mutex);
return ret;}
static int sharp_memory_clear_display(struct sharp_memory_device *smd){ int ret; u8 vcom = smd->vcom; u8 *tx_buffer = smd->tx_buffer;
mutex_lock(&smd->tx_mutex);
sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_CLEAR_MODE, vcom); tx_buffer[1] = 0; /* write dummy data */ ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2);
mutex_unlock(&smd->tx_mutex);
return ret;}
static void sharp_memory_fb_dirty(struct drm_framebuffer *fb, const struct iosys_map *vmap, struct drm_rect *rect, struct drm_format_conv_state *fmtconv_state){ struct drm_rect clip; struct sharp_memory_device *smd = drm_to_sharp_memory_device(fb->dev);
/* Always update a full line regardless of what is dirty */ clip.x1 = 0; clip.x2 = fb->width; clip.y1 = rect->y1; clip.y2 = rect->y2;
sharp_memory_update_display(smd, fb, vmap, clip, fmtconv_state);}
static int sharp_memory_plane_atomic_check(struct drm_plane *plane, struct drm_atomic_commit *state){ struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); struct sharp_memory_device *smd; struct drm_crtc_state *crtc_state;
smd = container_of(plane, struct sharp_memory_device, plane); crtc_state = drm_atomic_get_new_crtc_state(state, &smd->crtc);
return drm_atomic_helper_check_plane_state(plane_state, crtc_state, DRM_PLANE_NO_SCALING, DRM_PLANE_NO_SCALING, false, false);}
static void sharp_memory_plane_atomic_update(struct drm_plane *plane, struct drm_atomic_commit *state){ struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane); struct drm_plane_state *plane_state = plane->state; struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); struct sharp_memory_device *smd; struct drm_rect rect;
smd = container_of(plane, struct sharp_memory_device, plane); if (!smd->crtc.state->active) return;
if (drm_atomic_helper_damage_merged(old_state, plane_state, &rect)) sharp_memory_fb_dirty(plane_state->fb, shadow_plane_state->data, &rect, &shadow_plane_state->fmtcnv_state);}
static const struct drm_plane_helper_funcs sharp_memory_plane_helper_funcs = { .prepare_fb = drm_gem_plane_helper_prepare_fb, .atomic_check = sharp_memory_plane_atomic_check, .atomic_update = sharp_memory_plane_atomic_update, DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,};
static bool sharp_memory_format_mod_supported(struct drm_plane *plane, u32 format, u64 modifier){ return modifier == DRM_FORMAT_MOD_LINEAR;}
static const struct drm_plane_funcs sharp_memory_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, .format_mod_supported = sharp_memory_format_mod_supported,};
static enum drm_mode_status sharp_memory_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode){ struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
return drm_crtc_helper_mode_valid_fixed(crtc, mode, smd->mode);}
static int sharp_memory_crtc_check(struct drm_crtc *crtc, struct drm_atomic_commit *state){ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); int ret;
if (!crtc_state->enable) goto out;
ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state); if (ret) return ret;
out: return drm_atomic_add_affected_planes(state, crtc);}
static int sharp_memory_sw_vcom_signal_thread(void *data){ struct sharp_memory_device *smd = data;
while (!kthread_should_stop()) { smd->vcom ^= 1; /* Toggle vcom */ sharp_memory_maintain_display(smd); msleep(1000); }
return 0;}
static void sharp_memory_crtc_enable(struct drm_crtc *crtc, struct drm_atomic_commit *state){ struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
sharp_memory_clear_display(smd);
if (smd->enable_gpio) gpiod_set_value(smd->enable_gpio, 1);}
static void sharp_memory_crtc_disable(struct drm_crtc *crtc, struct drm_atomic_commit *state){ struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
sharp_memory_clear_display(smd);
if (smd->enable_gpio) gpiod_set_value(smd->enable_gpio, 0);}
static const struct drm_crtc_helper_funcs sharp_memory_crtc_helper_funcs = { .mode_valid = sharp_memory_crtc_mode_valid, .atomic_check = sharp_memory_crtc_check, .atomic_enable = sharp_memory_crtc_enable, .atomic_disable = sharp_memory_crtc_disable,};
static const struct drm_crtc_funcs sharp_memory_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 sharp_memory_encoder_funcs = { .destroy = drm_encoder_cleanup,};
static int sharp_memory_connector_get_modes(struct drm_connector *connector){ struct sharp_memory_device *smd = drm_to_sharp_memory_device(connector->dev);
return drm_connector_helper_get_modes_fixed(connector, smd->mode);}
static const struct drm_connector_helper_funcs sharp_memory_connector_hfuncs = { .get_modes = sharp_memory_connector_get_modes,};
static const struct drm_connector_funcs sharp_memory_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 sharp_memory_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 struct drm_display_mode sharp_memory_ls010b7dh04_mode = { DRM_SIMPLE_MODE(128, 128, 18, 18),};
static const struct drm_display_mode sharp_memory_ls011b7dh03_mode = { DRM_SIMPLE_MODE(160, 68, 25, 10),};
static const struct drm_display_mode sharp_memory_ls012b7dd01_mode = { DRM_SIMPLE_MODE(184, 38, 29, 6),};
static const struct drm_display_mode sharp_memory_ls013b7dh03_mode = { DRM_SIMPLE_MODE(128, 128, 23, 23),};
static const struct drm_display_mode sharp_memory_ls013b7dh05_mode = { DRM_SIMPLE_MODE(144, 168, 20, 24),};
static const struct drm_display_mode sharp_memory_ls018b7dh02_mode = { DRM_SIMPLE_MODE(230, 303, 27, 36),};
static const struct drm_display_mode sharp_memory_ls027b7dh01_mode = { DRM_SIMPLE_MODE(400, 240, 58, 35),};
static const struct drm_display_mode sharp_memory_ls032b7dd02_mode = { DRM_SIMPLE_MODE(336, 536, 42, 68),};
static const struct drm_display_mode sharp_memory_ls044q7dh01_mode = { DRM_SIMPLE_MODE(320, 240, 89, 67),};
static const struct spi_device_id sharp_memory_ids[] = { {"ls010b7dh04", (kernel_ulong_t)&sharp_memory_ls010b7dh04_mode}, {"ls011b7dh03", (kernel_ulong_t)&sharp_memory_ls011b7dh03_mode}, {"ls012b7dd01", (kernel_ulong_t)&sharp_memory_ls012b7dd01_mode}, {"ls013b7dh03", (kernel_ulong_t)&sharp_memory_ls013b7dh03_mode}, {"ls013b7dh05", (kernel_ulong_t)&sharp_memory_ls013b7dh05_mode}, {"ls018b7dh02", (kernel_ulong_t)&sharp_memory_ls018b7dh02_mode}, {"ls027b7dh01", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, {"ls027b7dh01a", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, {"ls032b7dd02", (kernel_ulong_t)&sharp_memory_ls032b7dd02_mode}, {"ls044q7dh01", (kernel_ulong_t)&sharp_memory_ls044q7dh01_mode}, {},};MODULE_DEVICE_TABLE(spi, sharp_memory_ids);
static const struct of_device_id sharp_memory_of_match[] = { {.compatible = "sharp,ls010b7dh04", &sharp_memory_ls010b7dh04_mode}, {.compatible = "sharp,ls011b7dh03", &sharp_memory_ls011b7dh03_mode}, {.compatible = "sharp,ls012b7dd01", &sharp_memory_ls012b7dd01_mode}, {.compatible = "sharp,ls013b7dh03", &sharp_memory_ls013b7dh03_mode}, {.compatible = "sharp,ls013b7dh05", &sharp_memory_ls013b7dh05_mode}, {.compatible = "sharp,ls018b7dh02", &sharp_memory_ls018b7dh02_mode}, {.compatible = "sharp,ls027b7dh01", &sharp_memory_ls027b7dh01_mode}, {.compatible = "sharp,ls027b7dh01a", &sharp_memory_ls027b7dh01_mode}, {.compatible = "sharp,ls032b7dd02", &sharp_memory_ls032b7dd02_mode}, {.compatible = "sharp,ls044q7dh01", &sharp_memory_ls044q7dh01_mode}, {},};MODULE_DEVICE_TABLE(of, sharp_memory_of_match);
static const u32 sharp_memory_formats[] = { DRM_FORMAT_XRGB8888,};
static int sharp_memory_pipe_init(struct drm_device *dev, struct sharp_memory_device *smd, const u32 *formats, unsigned int format_count, const u64 *format_modifiers){ int ret; struct drm_encoder *encoder = &smd->encoder; struct drm_plane *plane = &smd->plane; struct drm_crtc *crtc = &smd->crtc; struct drm_connector *connector = &smd->connector;
drm_plane_helper_add(plane, &sharp_memory_plane_helper_funcs); ret = drm_universal_plane_init(dev, plane, 0, &sharp_memory_plane_funcs, formats, format_count, format_modifiers, DRM_PLANE_TYPE_PRIMARY, NULL); if (ret) return ret;
drm_crtc_helper_add(crtc, &sharp_memory_crtc_helper_funcs); ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL, &sharp_memory_crtc_funcs, NULL); if (ret) return ret;
encoder->possible_crtcs = drm_crtc_mask(crtc); ret = drm_encoder_init(dev, encoder, &sharp_memory_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (ret) return ret;
ret = drm_connector_init(&smd->drm, &smd->connector, &sharp_memory_connector_funcs, DRM_MODE_CONNECTOR_SPI); if (ret) return ret;
drm_connector_helper_add(&smd->connector, &sharp_memory_connector_hfuncs);
return drm_connector_attach_encoder(connector, encoder);}
static int sharp_memory_init_pwm_vcom_signal(struct sharp_memory_device *smd){ int ret; struct device *dev = &smd->spi->dev; struct pwm_state pwm_state;
smd->pwm_vcom_signal = devm_pwm_get(dev, NULL); if (IS_ERR(smd->pwm_vcom_signal)) return dev_err_probe(dev, PTR_ERR(smd->pwm_vcom_signal), "Could not get pwm device\n");
pwm_init_state(smd->pwm_vcom_signal, &pwm_state); pwm_set_relative_duty_cycle(&pwm_state, 1, 10); pwm_state.enabled = true; ret = pwm_apply_might_sleep(smd->pwm_vcom_signal, &pwm_state); if (ret) return dev_err_probe(dev, -EINVAL, "Could not apply pwm state\n");
return 0;}
static int sharp_memory_probe(struct spi_device *spi){ int ret; struct device *dev; struct sharp_memory_device *smd; struct drm_device *drm; const char *vcom_mode_str;
dev = &spi->dev;
ret = spi_setup(spi); if (ret < 0) return dev_err_probe(dev, ret, "Failed to setup spi device\n");
if (!dev->coherent_dma_mask) { ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (ret) return dev_err_probe(dev, ret, "Failed to set dma mask\n"); }
smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver, struct sharp_memory_device, drm); if (IS_ERR(smd)) return PTR_ERR(smd);
spi_set_drvdata(spi, smd);
smd->spi = spi; drm = &smd->drm; ret = drmm_mode_config_init(drm); if (ret) return dev_err_probe(dev, ret, "Failed to initialize drm config\n");
smd->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); if (!smd->enable_gpio) dev_warn(dev, "Enable gpio not defined\n");
drm->mode_config.funcs = &sharp_memory_mode_config_funcs; smd->mode = spi_get_device_match_data(spi);
smd->pitch = (SHARP_ADDR_PERIOD + smd->mode->hdisplay + SHARP_DUMMY_PERIOD) / 8; smd->tx_buffer_size = (SHARP_MODE_PERIOD + (SHARP_ADDR_PERIOD + (smd->mode->hdisplay) + SHARP_DUMMY_PERIOD) * smd->mode->vdisplay) / 8;
smd->tx_buffer = devm_kzalloc(dev, smd->tx_buffer_size, GFP_KERNEL); if (!smd->tx_buffer) return -ENOMEM;
mutex_init(&smd->tx_mutex);
/* * VCOM is a signal that prevents DC bias from being built up in * the panel resulting in pixels being forever stuck in one state. * * This driver supports three different methods to generate this * signal depending on EXTMODE pin: * * software (EXTMODE = L) - This mode uses a kthread to * periodically send a "maintain display" message to the display, * toggling the vcom bit on and off with each message * * external (EXTMODE = H) - This mode relies on an external * clock to generate the signal on the EXTCOMM pin * * pwm (EXTMODE = H) - This mode uses a pwm device to generate * the signal on the EXTCOMM pin * */ if (device_property_read_string(dev, "sharp,vcom-mode", &vcom_mode_str)) return dev_err_probe(dev, -EINVAL, "Unable to find sharp,vcom-mode node in device tree\n");
if (!strcmp("software", vcom_mode_str)) { smd->vcom_mode = SHARP_MEMORY_SOFTWARE_VCOM; smd->sw_vcom_signal = kthread_run(sharp_memory_sw_vcom_signal_thread, smd, "sw_vcom_signal");
} else if (!strcmp("external", vcom_mode_str)) { smd->vcom_mode = SHARP_MEMORY_EXTERNAL_VCOM;
} else if (!strcmp("pwm", vcom_mode_str)) { smd->vcom_mode = SHARP_MEMORY_PWM_VCOM; ret = sharp_memory_init_pwm_vcom_signal(smd); if (ret) return ret; } else { return dev_err_probe(dev, -EINVAL, "Invalid value set for vcom-mode\n"); }
drm->mode_config.min_width = smd->mode->hdisplay; drm->mode_config.max_width = smd->mode->hdisplay; drm->mode_config.min_height = smd->mode->vdisplay; drm->mode_config.max_height = smd->mode->vdisplay;
ret = sharp_memory_pipe_init(drm, smd, sharp_memory_formats, ARRAY_SIZE(sharp_memory_formats), NULL); if (ret) return dev_err_probe(dev, ret, "Failed to initialize display pipeline.\n");
drm_plane_enable_fb_damage_clips(&smd->plane); drm_mode_config_reset(drm);
ret = drm_dev_register(drm, 0); if (ret) return dev_err_probe(dev, ret, "Failed to register drm device.\n");
drm_client_setup(drm, NULL);
return 0;}
static void sharp_memory_remove(struct spi_device *spi){ struct sharp_memory_device *smd = spi_get_drvdata(spi);
drm_dev_unplug(&smd->drm); drm_atomic_helper_shutdown(&smd->drm);
switch (smd->vcom_mode) { case SHARP_MEMORY_SOFTWARE_VCOM: kthread_stop(smd->sw_vcom_signal); break;
case SHARP_MEMORY_EXTERNAL_VCOM: break;
case SHARP_MEMORY_PWM_VCOM: pwm_disable(smd->pwm_vcom_signal); break; }}
static struct spi_driver sharp_memory_spi_driver = { .driver = { .name = "sharp_memory", .of_match_table = sharp_memory_of_match, }, .probe = sharp_memory_probe, .remove = sharp_memory_remove, .id_table = sharp_memory_ids,};module_spi_driver(sharp_memory_spi_driver);
MODULE_AUTHOR("Alex Lanzano <lanzano.alex@gmail.com>");MODULE_DESCRIPTION("SPI Protocol driver for the sharp_memory display");MODULE_LICENSE("GPL");