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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/delay.h>#include <linux/gpio/consumer.h>#include <linux/module.h>#include <linux/property.h>#include <linux/sched/clock.h>#include <linux/spi/spi.h>#include <linux/thermal.h>
#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_rect.h>#include <drm/drm_print.h>#include <drm/drm_probe_helper.h>
#define REPAPER_RID_G2_COG_ID 0x12
enum repaper_model { /* 0 is reserved to avoid clashing with NULL */ E1144CS021 = 1, E1190CS021, E2200CS021, E2271CS021,};
enum repaper_stage { /* Image pixel -> Display pixel */ REPAPER_COMPENSATE, /* B -> W, W -> B (Current Image) */ REPAPER_WHITE, /* B -> N, W -> W (Current Image) */ REPAPER_INVERSE, /* B -> N, W -> B (New Image) */ REPAPER_NORMAL /* B -> B, W -> W (New Image) */};
enum repaper_epd_border_byte { REPAPER_BORDER_BYTE_NONE, REPAPER_BORDER_BYTE_ZERO, REPAPER_BORDER_BYTE_SET,};
struct repaper_epd { struct drm_device drm; struct drm_plane plane; struct drm_crtc crtc; struct drm_encoder encoder; const struct drm_display_mode *mode; struct drm_connector connector; struct spi_device *spi;
struct gpio_desc *panel_on; struct gpio_desc *border; struct gpio_desc *discharge; struct gpio_desc *reset; struct gpio_desc *busy;
struct thermal_zone_device *thermal;
unsigned int height; unsigned int width; unsigned int bytes_per_scan; const u8 *channel_select; unsigned int stage_time; unsigned int factored_stage_time; bool middle_scan; bool pre_border_byte; enum repaper_epd_border_byte border_byte;
u8 *line_buffer; void *current_frame;
bool cleared; bool partial;};
static inline struct repaper_epd *drm_to_epd(struct drm_device *drm){ return container_of(drm, struct repaper_epd, drm);}
static int repaper_spi_transfer(struct spi_device *spi, u8 header, const void *tx, void *rx, size_t len){ void *txbuf = NULL, *rxbuf = NULL; struct spi_transfer tr[2] = {}; u8 *headerbuf; int ret;
headerbuf = kmalloc(1, GFP_KERNEL); if (!headerbuf) return -ENOMEM;
headerbuf[0] = header; tr[0].tx_buf = headerbuf; tr[0].len = 1;
/* Stack allocated tx? */ if (tx && len <= 32) { txbuf = kmemdup(tx, len, GFP_KERNEL); if (!txbuf) { ret = -ENOMEM; goto out_free; } }
if (rx) { rxbuf = kmalloc(len, GFP_KERNEL); if (!rxbuf) { ret = -ENOMEM; goto out_free; } }
tr[1].tx_buf = txbuf ? txbuf : tx; tr[1].rx_buf = rxbuf; tr[1].len = len;
ndelay(80); ret = spi_sync_transfer(spi, tr, 2); if (rx && !ret) memcpy(rx, rxbuf, len);
out_free: kfree(headerbuf); kfree(txbuf); kfree(rxbuf);
return ret;}
static int repaper_write_buf(struct spi_device *spi, u8 reg, const u8 *buf, size_t len){ int ret;
ret = repaper_spi_transfer(spi, 0x70, ®, NULL, 1); if (ret) return ret;
return repaper_spi_transfer(spi, 0x72, buf, NULL, len);}
static int repaper_write_val(struct spi_device *spi, u8 reg, u8 val){ return repaper_write_buf(spi, reg, &val, 1);}
static int repaper_read_val(struct spi_device *spi, u8 reg){ int ret; u8 val;
ret = repaper_spi_transfer(spi, 0x70, ®, NULL, 1); if (ret) return ret;
ret = repaper_spi_transfer(spi, 0x73, NULL, &val, 1);
return ret ? ret : val;}
static int repaper_read_id(struct spi_device *spi){ int ret; u8 id;
ret = repaper_spi_transfer(spi, 0x71, NULL, &id, 1);
return ret ? ret : id;}
static void repaper_spi_mosi_low(struct spi_device *spi){ const u8 buf[1] = { 0 };
spi_write(spi, buf, 1);}
/* pixels on display are numbered from 1 so even is actually bits 1,3,5,... */static void repaper_even_pixels(struct repaper_epd *epd, u8 **pp, const u8 *data, u8 fixed_value, const u8 *mask, enum repaper_stage stage){ unsigned int b;
for (b = 0; b < (epd->width / 8); b++) { if (data) { u8 pixels = data[b] & 0xaa; u8 pixel_mask = 0xff; u8 p1, p2, p3, p4;
if (mask) { pixel_mask = (mask[b] ^ pixels) & 0xaa; pixel_mask |= pixel_mask >> 1; }
switch (stage) { case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */ pixels = 0xaa | ((pixels ^ 0xaa) >> 1); break; case REPAPER_WHITE: /* B -> N, W -> W (Current) */ pixels = 0x55 + ((pixels ^ 0xaa) >> 1); break; case REPAPER_INVERSE: /* B -> N, W -> B (New) */ pixels = 0x55 | (pixels ^ 0xaa); break; case REPAPER_NORMAL: /* B -> B, W -> W (New) */ pixels = 0xaa | (pixels >> 1); break; }
pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55); p1 = (pixels >> 6) & 0x03; p2 = (pixels >> 4) & 0x03; p3 = (pixels >> 2) & 0x03; p4 = (pixels >> 0) & 0x03; pixels = (p1 << 0) | (p2 << 2) | (p3 << 4) | (p4 << 6); *(*pp)++ = pixels; } else { *(*pp)++ = fixed_value; } }}
/* pixels on display are numbered from 1 so odd is actually bits 0,2,4,... */static void repaper_odd_pixels(struct repaper_epd *epd, u8 **pp, const u8 *data, u8 fixed_value, const u8 *mask, enum repaper_stage stage){ unsigned int b;
for (b = epd->width / 8; b > 0; b--) { if (data) { u8 pixels = data[b - 1] & 0x55; u8 pixel_mask = 0xff;
if (mask) { pixel_mask = (mask[b - 1] ^ pixels) & 0x55; pixel_mask |= pixel_mask << 1; }
switch (stage) { case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */ pixels = 0xaa | (pixels ^ 0x55); break; case REPAPER_WHITE: /* B -> N, W -> W (Current) */ pixels = 0x55 + (pixels ^ 0x55); break; case REPAPER_INVERSE: /* B -> N, W -> B (New) */ pixels = 0x55 | ((pixels ^ 0x55) << 1); break; case REPAPER_NORMAL: /* B -> B, W -> W (New) */ pixels = 0xaa | pixels; break; }
pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55); *(*pp)++ = pixels; } else { *(*pp)++ = fixed_value; } }}
/* interleave bits: (byte)76543210 -> (16 bit).7.6.5.4.3.2.1 */static inline u16 repaper_interleave_bits(u16 value){ value = (value | (value << 4)) & 0x0f0f; value = (value | (value << 2)) & 0x3333; value = (value | (value << 1)) & 0x5555;
return value;}
/* pixels on display are numbered from 1 */static void repaper_all_pixels(struct repaper_epd *epd, u8 **pp, const u8 *data, u8 fixed_value, const u8 *mask, enum repaper_stage stage){ unsigned int b;
for (b = epd->width / 8; b > 0; b--) { if (data) { u16 pixels = repaper_interleave_bits(data[b - 1]); u16 pixel_mask = 0xffff;
if (mask) { pixel_mask = repaper_interleave_bits(mask[b - 1]);
pixel_mask = (pixel_mask ^ pixels) & 0x5555; pixel_mask |= pixel_mask << 1; }
switch (stage) { case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */ pixels = 0xaaaa | (pixels ^ 0x5555); break; case REPAPER_WHITE: /* B -> N, W -> W (Current) */ pixels = 0x5555 + (pixels ^ 0x5555); break; case REPAPER_INVERSE: /* B -> N, W -> B (New) */ pixels = 0x5555 | ((pixels ^ 0x5555) << 1); break; case REPAPER_NORMAL: /* B -> B, W -> W (New) */ pixels = 0xaaaa | pixels; break; }
pixels = (pixels & pixel_mask) | (~pixel_mask & 0x5555); *(*pp)++ = pixels >> 8; *(*pp)++ = pixels; } else { *(*pp)++ = fixed_value; *(*pp)++ = fixed_value; } }}
/* output one line of scan and data bytes to the display */static void repaper_one_line(struct repaper_epd *epd, unsigned int line, const u8 *data, u8 fixed_value, const u8 *mask, enum repaper_stage stage){ u8 *p = epd->line_buffer; unsigned int b;
repaper_spi_mosi_low(epd->spi);
if (epd->pre_border_byte) *p++ = 0x00;
if (epd->middle_scan) { /* data bytes */ repaper_odd_pixels(epd, &p, data, fixed_value, mask, stage);
/* scan line */ for (b = epd->bytes_per_scan; b > 0; b--) { if (line / 4 == b - 1) *p++ = 0x03 << (2 * (line & 0x03)); else *p++ = 0x00; }
/* data bytes */ repaper_even_pixels(epd, &p, data, fixed_value, mask, stage); } else { /* * even scan line, but as lines on display are numbered from 1, * line: 1,3,5,... */ for (b = 0; b < epd->bytes_per_scan; b++) { if (0 != (line & 0x01) && line / 8 == b) *p++ = 0xc0 >> (line & 0x06); else *p++ = 0x00; }
/* data bytes */ repaper_all_pixels(epd, &p, data, fixed_value, mask, stage);
/* * odd scan line, but as lines on display are numbered from 1, * line: 0,2,4,6,... */ for (b = epd->bytes_per_scan; b > 0; b--) { if (0 == (line & 0x01) && line / 8 == b - 1) *p++ = 0x03 << (line & 0x06); else *p++ = 0x00; } }
switch (epd->border_byte) { case REPAPER_BORDER_BYTE_NONE: break;
case REPAPER_BORDER_BYTE_ZERO: *p++ = 0x00; break;
case REPAPER_BORDER_BYTE_SET: switch (stage) { case REPAPER_COMPENSATE: case REPAPER_WHITE: case REPAPER_INVERSE: *p++ = 0x00; break; case REPAPER_NORMAL: *p++ = 0xaa; break; } break; }
repaper_write_buf(epd->spi, 0x0a, epd->line_buffer, p - epd->line_buffer);
/* Output data to panel */ repaper_write_val(epd->spi, 0x02, 0x07);
repaper_spi_mosi_low(epd->spi);}
static void repaper_frame_fixed(struct repaper_epd *epd, u8 fixed_value, enum repaper_stage stage){ unsigned int line;
for (line = 0; line < epd->height; line++) repaper_one_line(epd, line, NULL, fixed_value, NULL, stage);}
static void repaper_frame_data(struct repaper_epd *epd, const u8 *image, const u8 *mask, enum repaper_stage stage){ unsigned int line;
if (!mask) { for (line = 0; line < epd->height; line++) { repaper_one_line(epd, line, &image[line * (epd->width / 8)], 0, NULL, stage); } } else { for (line = 0; line < epd->height; line++) { size_t n = line * epd->width / 8;
repaper_one_line(epd, line, &image[n], 0, &mask[n], stage); } }}
static void repaper_frame_fixed_repeat(struct repaper_epd *epd, u8 fixed_value, enum repaper_stage stage){ u64 start = local_clock(); u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000);
do { repaper_frame_fixed(epd, fixed_value, stage); } while (local_clock() < end);}
static void repaper_frame_data_repeat(struct repaper_epd *epd, const u8 *image, const u8 *mask, enum repaper_stage stage){ u64 start = local_clock(); u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000);
do { repaper_frame_data(epd, image, mask, stage); } while (local_clock() < end);}
static void repaper_get_temperature(struct repaper_epd *epd){ int ret, temperature = 0; unsigned int factor10x;
if (!epd->thermal) return;
ret = thermal_zone_get_temp(epd->thermal, &temperature); if (ret) { DRM_DEV_ERROR(&epd->spi->dev, "Failed to get temperature (%d)\n", ret); return; }
temperature /= 1000;
if (temperature <= -10) factor10x = 170; else if (temperature <= -5) factor10x = 120; else if (temperature <= 5) factor10x = 80; else if (temperature <= 10) factor10x = 40; else if (temperature <= 15) factor10x = 30; else if (temperature <= 20) factor10x = 20; else if (temperature <= 40) factor10x = 10; else factor10x = 7;
epd->factored_stage_time = epd->stage_time * factor10x / 10;}
static int repaper_fb_dirty(struct drm_framebuffer *fb, const struct iosys_map *vmap, struct drm_format_conv_state *fmtcnv_state){ struct repaper_epd *epd = drm_to_epd(fb->dev); unsigned int dst_pitch = 0; struct iosys_map dst; struct drm_rect clip; int idx, ret = 0; u8 *buf = NULL;
if (!drm_dev_enter(fb->dev, &idx)) return -ENODEV;
/* repaper can't do partial updates */ clip.x1 = 0; clip.x2 = fb->width; clip.y1 = 0; clip.y2 = fb->height;
repaper_get_temperature(epd);
DRM_DEBUG("Flushing [FB:%d] st=%ums\n", fb->base.id, epd->factored_stage_time);
buf = kmalloc(fb->width * fb->height / 8, GFP_KERNEL); if (!buf) { ret = -ENOMEM; goto out_exit; }
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); if (ret) goto out_free;
iosys_map_set_vaddr(&dst, buf); drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, &clip, fmtcnv_state);
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
if (epd->partial) { repaper_frame_data_repeat(epd, buf, epd->current_frame, REPAPER_NORMAL); } else if (epd->cleared) { repaper_frame_data_repeat(epd, epd->current_frame, NULL, REPAPER_COMPENSATE); repaper_frame_data_repeat(epd, epd->current_frame, NULL, REPAPER_WHITE); repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE); repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
epd->partial = true; } else { /* Clear display (anything -> white) */ repaper_frame_fixed_repeat(epd, 0xff, REPAPER_COMPENSATE); repaper_frame_fixed_repeat(epd, 0xff, REPAPER_WHITE); repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_INVERSE); repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_NORMAL);
/* Assuming a clear (white) screen output an image */ repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_COMPENSATE); repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_WHITE); repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE); repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
epd->cleared = true; epd->partial = true; }
memcpy(epd->current_frame, buf, fb->width * fb->height / 8);
/* * An extra frame write is needed if pixels are set in the bottom line, * or else grey lines rises up from the pixels */ if (epd->pre_border_byte) { unsigned int x;
for (x = 0; x < (fb->width / 8); x++) if (buf[x + (fb->width * (fb->height - 1) / 8)]) { repaper_frame_data_repeat(epd, buf, epd->current_frame, REPAPER_NORMAL); break; } }
out_free: kfree(buf);out_exit: drm_dev_exit(idx);
return ret;}
static void power_off(struct repaper_epd *epd){ /* Turn off power and all signals */ gpiod_set_value_cansleep(epd->reset, 0); gpiod_set_value_cansleep(epd->panel_on, 0); if (epd->border) gpiod_set_value_cansleep(epd->border, 0);
/* Ensure SPI MOSI and CLOCK are Low before CS Low */ repaper_spi_mosi_low(epd->spi);
/* Discharge pulse */ gpiod_set_value_cansleep(epd->discharge, 1); msleep(150); gpiod_set_value_cansleep(epd->discharge, 0);}
static enum drm_mode_status repaper_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode){ struct repaper_epd *epd = drm_to_epd(crtc->dev);
return drm_crtc_helper_mode_valid_fixed(crtc, mode, epd->mode);}
static void repaper_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_commit *commit){ struct repaper_epd *epd = drm_to_epd(crtc->dev); struct spi_device *spi = epd->spi; struct device *dev = &spi->dev; bool dc_ok = false; int i, ret, idx;
if (!drm_dev_enter(crtc->dev, &idx)) return;
DRM_DEBUG_DRIVER("\n");
/* Power up sequence */ gpiod_set_value_cansleep(epd->reset, 0); gpiod_set_value_cansleep(epd->panel_on, 0); gpiod_set_value_cansleep(epd->discharge, 0); if (epd->border) gpiod_set_value_cansleep(epd->border, 0); repaper_spi_mosi_low(spi); usleep_range(5000, 10000);
gpiod_set_value_cansleep(epd->panel_on, 1); /* * This delay comes from the repaper.org userspace driver, it's not * mentioned in the datasheet. */ usleep_range(10000, 15000); gpiod_set_value_cansleep(epd->reset, 1); if (epd->border) gpiod_set_value_cansleep(epd->border, 1); usleep_range(5000, 10000); gpiod_set_value_cansleep(epd->reset, 0); usleep_range(5000, 10000); gpiod_set_value_cansleep(epd->reset, 1); usleep_range(5000, 10000);
/* Wait for COG to become ready */ for (i = 100; i > 0; i--) { if (!gpiod_get_value_cansleep(epd->busy)) break;
usleep_range(10, 100); }
if (!i) { DRM_DEV_ERROR(dev, "timeout waiting for panel to become ready.\n"); power_off(epd); goto out_exit; }
repaper_read_id(spi); ret = repaper_read_id(spi); if (ret != REPAPER_RID_G2_COG_ID) { if (ret < 0) dev_err(dev, "failed to read chip (%d)\n", ret); else dev_err(dev, "wrong COG ID 0x%02x\n", ret); power_off(epd); goto out_exit; }
/* Disable OE */ repaper_write_val(spi, 0x02, 0x40);
ret = repaper_read_val(spi, 0x0f); if (ret < 0 || !(ret & 0x80)) { if (ret < 0) DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret); else DRM_DEV_ERROR(dev, "panel is reported broken\n"); power_off(epd); goto out_exit; }
/* Power saving mode */ repaper_write_val(spi, 0x0b, 0x02); /* Channel select */ repaper_write_buf(spi, 0x01, epd->channel_select, 8); /* High power mode osc */ repaper_write_val(spi, 0x07, 0xd1); /* Power setting */ repaper_write_val(spi, 0x08, 0x02); /* Vcom level */ repaper_write_val(spi, 0x09, 0xc2); /* Power setting */ repaper_write_val(spi, 0x04, 0x03); /* Driver latch on */ repaper_write_val(spi, 0x03, 0x01); /* Driver latch off */ repaper_write_val(spi, 0x03, 0x00); usleep_range(5000, 10000);
/* Start chargepump */ for (i = 0; i < 4; ++i) { /* Charge pump positive voltage on - VGH/VDL on */ repaper_write_val(spi, 0x05, 0x01); msleep(240);
/* Charge pump negative voltage on - VGL/VDL on */ repaper_write_val(spi, 0x05, 0x03); msleep(40);
/* Charge pump Vcom on - Vcom driver on */ repaper_write_val(spi, 0x05, 0x0f); msleep(40);
/* check DC/DC */ ret = repaper_read_val(spi, 0x0f); if (ret < 0) { DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret); power_off(epd); goto out_exit; }
if (ret & 0x40) { dc_ok = true; break; } }
if (!dc_ok) { DRM_DEV_ERROR(dev, "dc/dc failed\n"); power_off(epd); goto out_exit; }
/* * Output enable to disable * The userspace driver sets this to 0x04, but the datasheet says 0x06 */ repaper_write_val(spi, 0x02, 0x04);
epd->partial = false;out_exit: drm_dev_exit(idx);}
static void repaper_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_commit *commit){ struct repaper_epd *epd = drm_to_epd(crtc->dev); struct spi_device *spi = epd->spi; unsigned int line;
/* * This callback is not protected by drm_dev_enter/exit since we want to * turn off the display on regular driver unload. It's highly unlikely * that the underlying SPI controller is gone should this be called after * unplug. */
DRM_DEBUG_DRIVER("\n");
/* Nothing frame */ for (line = 0; line < epd->height; line++) repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL, REPAPER_COMPENSATE);
/* 2.7" */ if (epd->border) { /* Dummy line */ repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL, REPAPER_COMPENSATE); msleep(25); gpiod_set_value_cansleep(epd->border, 0); msleep(200); gpiod_set_value_cansleep(epd->border, 1); } else { /* Border dummy line */ repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL, REPAPER_NORMAL); msleep(200); }
/* not described in datasheet */ repaper_write_val(spi, 0x0b, 0x00); /* Latch reset turn on */ repaper_write_val(spi, 0x03, 0x01); /* Power off charge pump Vcom */ repaper_write_val(spi, 0x05, 0x03); /* Power off charge pump neg voltage */ repaper_write_val(spi, 0x05, 0x01); msleep(120); /* Discharge internal */ repaper_write_val(spi, 0x04, 0x80); /* turn off all charge pumps */ repaper_write_val(spi, 0x05, 0x00); /* Turn off osc */ repaper_write_val(spi, 0x07, 0x01); msleep(50);
power_off(epd);}
static void repaper_plane_helper_atomic_update(struct drm_plane *plane, struct drm_atomic_commit *commit){ struct drm_plane_state *old_pstate = drm_atomic_get_old_plane_state(commit, plane); struct drm_plane_state *pstate = drm_atomic_get_new_plane_state(commit, plane); struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(pstate); struct drm_crtc_state *cstate = NULL; struct drm_rect rect;
if (pstate->crtc) cstate = drm_atomic_get_new_crtc_state(commit, pstate->crtc);
if (!cstate || !cstate->active) return;
if (drm_atomic_helper_damage_merged(old_pstate, pstate, &rect)) repaper_fb_dirty(pstate->fb, shadow_plane_state->data, &shadow_plane_state->fmtcnv_state);}
static const struct drm_plane_funcs repaper_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 int repaper_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_commit *commit){ struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(commit, plane); struct drm_crtc_state *crtc_state = NULL;
if (plane_state->crtc) { crtc_state = drm_atomic_get_crtc_state(commit, plane_state->crtc); if (IS_ERR(crtc_state)) return PTR_ERR(crtc_state); }
return drm_atomic_helper_check_plane_state(plane_state, crtc_state, DRM_PLANE_NO_SCALING, DRM_PLANE_NO_SCALING, false, false);}
static const struct drm_plane_helper_funcs repaper_plane_helper_funcs = { DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, .atomic_check = repaper_plane_helper_atomic_check, .atomic_update = repaper_plane_helper_atomic_update,};
static int repaper_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_commit *commit){ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(commit, crtc); int ret;
if (crtc_state->enable) { ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state); if (ret) return ret; }
return drm_atomic_add_affected_planes(commit, crtc);}
static const struct drm_crtc_helper_funcs repaper_crtc_helper_funcs = { .mode_valid = repaper_crtc_helper_mode_valid, .atomic_check = repaper_crtc_helper_atomic_check, .atomic_enable = repaper_crtc_helper_atomic_enable, .atomic_disable = repaper_crtc_helper_atomic_disable,};
static const struct drm_crtc_funcs repaper_crtc_funcs = { .set_config = drm_atomic_helper_set_config, .page_flip = drm_atomic_helper_page_flip, .atomic_create_state = drm_atomic_helper_crtc_create_state, .destroy = drm_crtc_cleanup, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,};
static const struct drm_encoder_funcs repaper_encoder_funcs = { .destroy = drm_encoder_cleanup,};
static int repaper_connector_get_modes(struct drm_connector *connector){ struct repaper_epd *epd = drm_to_epd(connector->dev);
return drm_connector_helper_get_modes_fixed(connector, epd->mode);}
static const struct drm_connector_helper_funcs repaper_connector_hfuncs = { .get_modes = repaper_connector_get_modes,};
static const struct drm_connector_funcs repaper_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 repaper_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 repaper_formats[] = { DRM_FORMAT_XRGB8888,};
static const struct drm_display_mode repaper_e1144cs021_mode = { DRM_SIMPLE_MODE(128, 96, 29, 22),};
static const u8 repaper_e1144cs021_cs[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xff, 0x00 };
static const struct drm_display_mode repaper_e1190cs021_mode = { DRM_SIMPLE_MODE(144, 128, 36, 32),};
static const u8 repaper_e1190cs021_cs[] = { 0x00, 0x00, 0x00, 0x03, 0xfc, 0x00, 0x00, 0xff };
static const struct drm_display_mode repaper_e2200cs021_mode = { DRM_SIMPLE_MODE(200, 96, 46, 22),};
static const u8 repaper_e2200cs021_cs[] = { 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xe0, 0x00 };
static const struct drm_display_mode repaper_e2271cs021_mode = { DRM_SIMPLE_MODE(264, 176, 57, 38),};
static const u8 repaper_e2271cs021_cs[] = { 0x00, 0x00, 0x00, 0x7f, 0xff, 0xfe, 0x00, 0x00 };
DEFINE_DRM_GEM_DMA_FOPS(repaper_fops);
static const struct drm_driver repaper_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, .fops = &repaper_fops, DRM_GEM_DMA_DRIVER_OPS_VMAP, DRM_FBDEV_DMA_DRIVER_OPS, .name = "repaper", .desc = "Pervasive Displays RePaper e-ink panels", .major = 1, .minor = 0,};
static const struct of_device_id repaper_of_match[] = { { .compatible = "pervasive,e1144cs021", .data = (void *)E1144CS021 }, { .compatible = "pervasive,e1190cs021", .data = (void *)E1190CS021 }, { .compatible = "pervasive,e2200cs021", .data = (void *)E2200CS021 }, { .compatible = "pervasive,e2271cs021", .data = (void *)E2271CS021 }, {},};MODULE_DEVICE_TABLE(of, repaper_of_match);
static const struct spi_device_id repaper_id[] = { { "e1144cs021", E1144CS021 }, { "e1190cs021", E1190CS021 }, { "e2200cs021", E2200CS021 }, { "e2271cs021", E2271CS021 }, { },};MODULE_DEVICE_TABLE(spi, repaper_id);
static int repaper_probe(struct spi_device *spi){ const struct drm_display_mode *mode; const struct spi_device_id *spi_id; struct device *dev = &spi->dev; enum repaper_model model; const char *thermal_zone; struct repaper_epd *epd; size_t line_buffer_size; struct drm_device *drm; const void *match; int ret;
match = device_get_match_data(dev); if (match) { model = (enum repaper_model)(uintptr_t)match; } else { spi_id = spi_get_device_id(spi); model = (enum repaper_model)spi_id->driver_data; }
/* The SPI device is used to allocate dma memory */ if (!dev->coherent_dma_mask) { ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (ret) { dev_warn(dev, "Failed to set dma mask %d\n", ret); return ret; } }
epd = devm_drm_dev_alloc(dev, &repaper_driver, struct repaper_epd, drm); if (IS_ERR(epd)) return PTR_ERR(epd);
drm = &epd->drm;
ret = drmm_mode_config_init(drm); if (ret) return ret; drm->mode_config.funcs = &repaper_mode_config_funcs;
epd->spi = spi;
epd->panel_on = devm_gpiod_get(dev, "panel-on", GPIOD_OUT_LOW); if (IS_ERR(epd->panel_on)) { ret = PTR_ERR(epd->panel_on); if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to get gpio 'panel-on'\n"); return ret; }
epd->discharge = devm_gpiod_get(dev, "discharge", GPIOD_OUT_LOW); if (IS_ERR(epd->discharge)) { ret = PTR_ERR(epd->discharge); if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to get gpio 'discharge'\n"); return ret; }
epd->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(epd->reset)) { ret = PTR_ERR(epd->reset); if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); return ret; }
epd->busy = devm_gpiod_get(dev, "busy", GPIOD_IN); if (IS_ERR(epd->busy)) { ret = PTR_ERR(epd->busy); if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to get gpio 'busy'\n"); return ret; }
if (!device_property_read_string(dev, "pervasive,thermal-zone", &thermal_zone)) { epd->thermal = thermal_zone_get_zone_by_name(thermal_zone); if (IS_ERR(epd->thermal)) { DRM_DEV_ERROR(dev, "Failed to get thermal zone: %s\n", thermal_zone); return PTR_ERR(epd->thermal); } }
switch (model) { case E1144CS021: mode = &repaper_e1144cs021_mode; epd->channel_select = repaper_e1144cs021_cs; epd->stage_time = 480; epd->bytes_per_scan = 96 / 4; epd->middle_scan = true; /* data-scan-data */ epd->pre_border_byte = false; epd->border_byte = REPAPER_BORDER_BYTE_ZERO; break;
case E1190CS021: mode = &repaper_e1190cs021_mode; epd->channel_select = repaper_e1190cs021_cs; epd->stage_time = 480; epd->bytes_per_scan = 128 / 4 / 2; epd->middle_scan = false; /* scan-data-scan */ epd->pre_border_byte = false; epd->border_byte = REPAPER_BORDER_BYTE_SET; break;
case E2200CS021: mode = &repaper_e2200cs021_mode; epd->channel_select = repaper_e2200cs021_cs; epd->stage_time = 480; epd->bytes_per_scan = 96 / 4; epd->middle_scan = true; /* data-scan-data */ epd->pre_border_byte = true; epd->border_byte = REPAPER_BORDER_BYTE_NONE; break;
case E2271CS021: epd->border = devm_gpiod_get(dev, "border", GPIOD_OUT_LOW); if (IS_ERR(epd->border)) { ret = PTR_ERR(epd->border); if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to get gpio 'border'\n"); return ret; }
mode = &repaper_e2271cs021_mode; epd->channel_select = repaper_e2271cs021_cs; epd->stage_time = 630; epd->bytes_per_scan = 176 / 4; epd->middle_scan = true; /* data-scan-data */ epd->pre_border_byte = true; epd->border_byte = REPAPER_BORDER_BYTE_NONE; break;
default: return -ENODEV; }
epd->mode = mode; epd->width = mode->hdisplay; epd->height = mode->vdisplay; epd->factored_stage_time = epd->stage_time;
line_buffer_size = 2 * epd->width / 8 + epd->bytes_per_scan + 2; epd->line_buffer = devm_kzalloc(dev, line_buffer_size, GFP_KERNEL); if (!epd->line_buffer) return -ENOMEM;
epd->current_frame = devm_kzalloc(dev, epd->width * epd->height / 8, GFP_KERNEL); if (!epd->current_frame) return -ENOMEM;
drm->mode_config.min_width = mode->hdisplay; drm->mode_config.max_width = mode->hdisplay; drm->mode_config.min_height = mode->vdisplay; drm->mode_config.max_height = mode->vdisplay;
drm_connector_helper_add(&epd->connector, &repaper_connector_hfuncs); ret = drm_connector_init(drm, &epd->connector, &repaper_connector_funcs, DRM_MODE_CONNECTOR_SPI); if (ret) return ret;
ret = drm_universal_plane_init(drm, &epd->plane, 0, &repaper_plane_funcs, repaper_formats, ARRAY_SIZE(repaper_formats), NULL, DRM_PLANE_TYPE_PRIMARY, NULL); if (ret) return ret; drm_plane_helper_add(&epd->plane, &repaper_plane_helper_funcs);
ret = drm_crtc_init_with_planes(drm, &epd->crtc, &epd->plane, NULL, &repaper_crtc_funcs, NULL); if (ret) return ret; drm_crtc_helper_add(&epd->crtc, &repaper_crtc_helper_funcs);
ret = drm_encoder_init(drm, &epd->encoder, &repaper_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (ret) return ret; epd->encoder.possible_crtcs = drm_crtc_mask(&epd->crtc);
ret = drm_connector_attach_encoder(&epd->connector, &epd->encoder); if (ret) return ret;
drm_mode_config_reset(drm);
ret = drm_dev_register(drm, 0); if (ret) return ret;
spi_set_drvdata(spi, drm);
DRM_DEBUG_DRIVER("SPI speed: %uMHz\n", spi->max_speed_hz / 1000000);
drm_client_setup(drm, NULL);
return 0;}
static void repaper_remove(struct spi_device *spi){ struct drm_device *drm = spi_get_drvdata(spi);
drm_dev_unplug(drm); drm_atomic_helper_shutdown(drm);}
static void repaper_shutdown(struct spi_device *spi){ drm_atomic_helper_shutdown(spi_get_drvdata(spi));}
static struct spi_driver repaper_spi_driver = { .driver = { .name = "repaper", .of_match_table = repaper_of_match, }, .id_table = repaper_id, .probe = repaper_probe, .remove = repaper_remove, .shutdown = repaper_shutdown,};module_spi_driver(repaper_spi_driver);
MODULE_DESCRIPTION("Pervasive Displays RePaper DRM driver");MODULE_AUTHOR("Noralf Trønnes");MODULE_LICENSE("GPL");