A hack to test the client API.
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/client/Kconfig | 5 + drivers/gpu/drm/client/Makefile | 3 + drivers/gpu/drm/client/drm_vtcon.c | 785 +++++++++++++++++++++++++++++++++++++ 4 files changed, 794 insertions(+) create mode 100644 drivers/gpu/drm/client/Makefile create mode 100644 drivers/gpu/drm/client/drm_vtcon.c
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 388527093f80..ea63eb9e93ec 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o obj-$(CONFIG_DRM_DEBUG_MM_SELFTEST) += selftests/
obj-$(CONFIG_DRM) += drm.o +obj-y += client/ obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o obj-$(CONFIG_DRM_PANEL_ORIENTATION_QUIRKS) += drm_panel_orientation_quirks.o obj-$(CONFIG_DRM_ARM) += arm/ diff --git a/drivers/gpu/drm/client/Kconfig b/drivers/gpu/drm/client/Kconfig index 6b01f2e51fb3..b03f3baf8b3f 100644 --- a/drivers/gpu/drm/client/Kconfig +++ b/drivers/gpu/drm/client/Kconfig @@ -6,4 +6,9 @@ config DRM_CLIENT_BOOTSPLASH help DRM Bootsplash
+config DRM_CLIENT_VTCON + tristate "DRM VT console" + help + DRM VT console + endmenu diff --git a/drivers/gpu/drm/client/Makefile b/drivers/gpu/drm/client/Makefile new file mode 100644 index 000000000000..7d39f1bc2b68 --- /dev/null +++ b/drivers/gpu/drm/client/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_DRM_CLIENT_VTCON) += drm_vtcon.o diff --git a/drivers/gpu/drm/client/drm_vtcon.c b/drivers/gpu/drm/client/drm_vtcon.c new file mode 100644 index 000000000000..910b4ec1a686 --- /dev/null +++ b/drivers/gpu/drm/client/drm_vtcon.c @@ -0,0 +1,785 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2018 Noralf Trønnes + +#include <linux/console.h> +#include <linux/font.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/vt_buffer.h> +#include <linux/vt_kern.h> +#include <linux/workqueue.h> + +#include <drm/drm_client.h> +#include <drm/drm_drv.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_modes.h> +#include <drm/drm_print.h> + +/* TODO: Scrolling */ + +/* + * The code consists of 3 parts: + * + * 1. The DRM client + * Gets a display, uses the first mode to find a font, + * sets the max cols/rows and a matching text buffer. + * + * 2. The VT console + * Writes to the text buffer which consists of CGA colored characters. + * Schedules the worker when it needs rendering or blanking. + * + * 3. Worker + * Does modesetting, blanking and rendering. + * It takes a snapshot of the VT text buffer and renders the changes since + * last. + */ + +struct drm_vtcon_vc { + struct mutex lock; + + u16 *text_buf; + size_t buf_len; + + unsigned int rows; + unsigned int cols; + unsigned int max_rows; + unsigned int max_cols; + const struct font_desc *font; + bool blank; + unsigned long cursor_blink_jiffies; +}; + +static struct drm_vtcon_vc *drm_vtcon_vc; + +struct drm_vtcon { + struct drm_client_dev *client; + struct drm_client_display *display; + struct drm_client_buffer *buffer; + + unsigned int rows; + unsigned int cols; + + u16 *text_buf[2]; + size_t buf_len; + unsigned int buf_idx; + bool blank; +}; + +static struct drm_vtcon *vtcon_instance; + +static int drm_vtcon_dev_id; +module_param_named(dev, drm_vtcon_dev_id, int, 0600); +MODULE_PARM_DESC(drm_vtcon_dev_id, "DRM device id [default=0]"); + +#define drm_vtcon_debug(vc, fmt, ...) \ + pr_debug("%s[%u]: " fmt, __func__, vc->vc_num, ##__VA_ARGS__) + +/* CGA color palette: 4-bit RGBI: intense red green blue */ +static const u32 drm_vtcon_paletteX888[16] = { + 0x00000000, /* 0 black */ + 0x000000aa, /* 1 blue */ + 0x0000aa00, /* 2 green */ + 0x0000aaaa, /* 3 cyan */ + 0x00aa0000, /* 4 red */ + 0x00aa00aa, /* 5 magenta */ + 0x00aa5500, /* 6 brown */ + 0x00aaaaaa, /* 7 light gray */ + 0x00555555, /* 8 dark gray */ + 0x005555ff, /* 9 bright blue */ + 0x0055ff55, /* 10 bright green */ + 0x0055ffff, /* 11 bright cyan */ + 0x00ff5555, /* 12 bright red */ + 0x00ff55ff, /* 13 bright magenta */ + 0x00ffff55, /* 14 yellow */ + 0x00ffffff /* 15 white */ +}; + +static void +drm_vtcon_render_char(struct drm_vtcon *vtcon, unsigned int x, unsigned int y, + u16 cc, const struct font_desc *font) +{ + struct drm_client_buffer *buffer = vtcon->buffer; + unsigned int h, w; + const u8 *src; + void *dst; + u32 *pix; + u32 fg_col = drm_vtcon_paletteX888[(cc & 0x0f00) >> 8]; + u32 bg_col = drm_vtcon_paletteX888[cc >> 12]; + + src = font->data + (cc & 0xff) * font->height; + dst = vtcon->buffer->vaddr + y * buffer->pitch + x * sizeof(u32); + + for (h = 0; h < font->height; h++) { + u8 fontline = *(src + h); + + pix = dst; + for (w = 0; w < font->width; w++) + pix[w] = fontline & BIT(7 - w) ? fg_col : bg_col; + dst += buffer->pitch; + } +} + +static int drm_vtcon_modeset(struct drm_vtcon *vtcon, unsigned int cols, + unsigned int rows, const struct font_desc *font) +{ + struct drm_client_display *display = vtcon->display; + struct drm_client_dev *client = vtcon->client; + struct drm_display_mode *mode, *best_mode = NULL; + unsigned int best_cols = ~0, best_rows = ~0; + struct drm_client_buffer *buffer; + int ret; + + DRM_DEV_INFO(client->dev->dev, "IN %ux%u\n", cols, rows); + + /* Find the smallest mode that fits */ + drm_client_display_for_each_mode(mode, display) { + unsigned int mode_cols = mode->hdisplay / font->width; + unsigned int mode_rows = mode->vdisplay / font->height; + + DRM_DEV_INFO(client->dev->dev, + "try: %ux%u\n", mode_cols, mode_rows); + + if (mode_cols < cols || mode_rows < rows) + break; + + if (mode_cols >= best_cols || mode_rows >= best_rows) + continue; + + best_cols = mode_cols; + best_rows = mode_rows; + best_mode = mode; + } + + if (!best_mode) { + DRM_DEV_INFO(client->dev->dev, "Couldn't find mode for %ux%u\n", cols, rows); + return -EINVAL; + } + + DRM_DEV_INFO(client->dev->dev, "Chosen: %ux%u\n", best_cols, best_rows); + + buffer = drm_client_framebuffer_create(client, best_mode, DRM_FORMAT_XRGB8888); + if (IS_ERR(buffer)) { + ret = PTR_ERR(buffer); + DRM_DEV_ERROR(client->dev->dev, + "Failed to create framebuffer: %d\n", ret); + return ret; + } + + ret = drm_client_display_commit(display, buffer->fb, best_mode); + if (ret) { + DRM_DEV_ERROR(client->dev->dev, + "Failed to commit mode: %d\n", ret); + goto err_free_buffer; + } + + drm_client_framebuffer_delete(vtcon->buffer); + + vtcon->buffer = buffer; + vtcon->cols = cols; + vtcon->rows = rows; + + DRM_DEV_INFO(client->dev->dev, "OUT\n"); + + return 0; + +err_free_buffer: + drm_client_framebuffer_delete(buffer); + + DRM_DEV_INFO(client->dev->dev, "OUT ret=%d\n", ret); + + return ret; +} + +static void drm_vtcon_blank(struct drm_vtcon *vtcon, bool blank) +{ + int mode = blank ? DRM_MODE_DPMS_OFF : DRM_MODE_DPMS_ON; + + drm_client_display_dpms(vtcon->display, mode); + vtcon->blank = blank; +} + +static int drm_vtcon_resize_buf(struct drm_vtcon *vtcon, size_t len) +{ + u16 *text_buf[2]; + + text_buf[0] = kzalloc(len, GFP_KERNEL); + text_buf[1] = kzalloc(len, GFP_KERNEL); + if (!text_buf[0] || !text_buf[1]) { + kfree(text_buf[0]); + kfree(text_buf[1]); + return -ENOMEM; + } + + kfree(vtcon->text_buf[0]); + kfree(vtcon->text_buf[1]); + + vtcon->text_buf[0] = text_buf[0]; + vtcon->text_buf[1] = text_buf[1]; + vtcon->buf_len = len; + + return 0; +} + +static void drm_vtcon_work_fn(struct work_struct *work) +{ + struct drm_vtcon *vtcon = vtcon_instance; + unsigned int vc_cols, vc_rows, col, row, x, y; + const struct font_desc *font; + u16 prev, curr; + bool blank, render_all = false; + struct drm_clip_rect clip = { + .x1 = ~0, + .y1 = ~0, + .x2 = 0, + .y2 = 0, + }; + char *str; + int ret; + + if (!vtcon->display) + return; + + mutex_lock(&drm_vtcon_vc->lock); + + vc_cols = drm_vtcon_vc->cols; + vc_rows = drm_vtcon_vc->rows; + font = drm_vtcon_vc->font; + blank = drm_vtcon_vc->blank; + + if (vtcon->buf_len != drm_vtcon_vc->buf_len) { + ret = drm_vtcon_resize_buf(vtcon, drm_vtcon_vc->buf_len); + if (ret) { + mutex_unlock(&drm_vtcon_vc->lock); + return; + } + render_all = true; + } + + vtcon->buf_idx = !vtcon->buf_idx; + memcpy(vtcon->text_buf[vtcon->buf_idx], drm_vtcon_vc->text_buf, + vc_cols * vc_rows * sizeof(u16)); + + mutex_unlock(&drm_vtcon_vc->lock); + + if (vtcon->cols != vc_cols || vtcon->rows != vc_rows) { + ret = drm_vtcon_modeset(vtcon, vc_cols, vc_rows, font); + if (ret) + return; + render_all = true; + } else if (vtcon->blank != blank) { + drm_vtcon_blank(vtcon, blank); + } + + str = kmalloc(vc_cols + 1, GFP_KERNEL); + if (!str) + return; + + for (row = 0; row < vc_rows; row++) { + for (col = 0; col < vc_cols; col++) { + prev = vtcon->text_buf[!vtcon->buf_idx][col + (row * vc_cols)]; + curr = vtcon->text_buf[vtcon->buf_idx][col + (row * vc_cols)]; + + if (render_all || prev != curr) { + str[col] = curr; + x = col * font->width; + y = row * font->height; + + clip.x1 = min_t(u32, clip.x1, x); + clip.y1 = min_t(u32, clip.y1, y); + clip.x2 = max_t(u32, clip.x2, x + font->width); + clip.y2 = max_t(u32, clip.y2, y + font->height); + + drm_vtcon_render_char(vtcon, x, y, curr, font); + } else { + str[col] = ' '; + } + } + str[vc_cols] = '\0'; +// pr_info("%02u|%s\n", row, str); + } + + kfree(str); + + if (clip.x1 < clip.x2) + drm_client_framebuffer_flush(vtcon->buffer, &clip); +} + +static DECLARE_WORK(drm_vtcon_work, drm_vtcon_work_fn); + +static const char *drm_vtcon_con_startup(void) +{ + return "drm-vt"; +} + +static void drm_vtcon_con_init(struct vc_data *vc, int init) +{ + drm_vtcon_debug(vc, "(init=%d) drm_vtcon_vc=%p\n", init, drm_vtcon_vc); + + vc->vc_can_do_color = 1; + + if (init) { + vc->vc_cols = drm_vtcon_vc->cols; + vc->vc_rows = drm_vtcon_vc->rows; + } else { + vc_resize(vc, drm_vtcon_vc->cols, drm_vtcon_vc->rows); + } +} + +static void drm_vtcon_con_deinit(struct vc_data *vc) +{ + drm_vtcon_debug(vc, "\n"); +} + +static void drm_vtcon_con_putcs(struct vc_data *vc, const unsigned short *s, + int count, int y, int x) +{ + u16 *dest; + + dest = &drm_vtcon_vc->text_buf[x + (y * drm_vtcon_vc->cols)]; + + for (; count > 0; count--) + scr_writew(scr_readw(s++), dest++); + + schedule_work(&drm_vtcon_work); +} + +static void drm_vtcon_con_putc(struct vc_data *vc, int ch, int y, int x) +{ + unsigned short chr; + + scr_writew(ch, &chr); + drm_vtcon_con_putcs(vc, &chr, 1, y, x); +} + +/* TODO: How do I actually test this? */ +static void drm_vtcon_con_clear(struct vc_data *vc, int y, int x, + int height, int width) +{ + drm_vtcon_debug(vc, "\n"); + + scr_memcpyw(drm_vtcon_vc->text_buf, (unsigned short *)vc->vc_pos, + vc->vc_cols * vc->vc_rows); + schedule_work(&drm_vtcon_work); +} + +static int drm_vtcon_con_switch(struct vc_data *vc) +{ + drm_vtcon_debug(vc, "%ux%u\n", vc->vc_cols, vc->vc_rows); + + mutex_lock(&drm_vtcon_vc->lock); + drm_vtcon_vc->cols = vc->vc_cols; + drm_vtcon_vc->rows = vc->vc_rows; + mutex_unlock(&drm_vtcon_vc->lock); + + return 1; /* redraw */ +} + +static int drm_vtcon_con_resize(struct vc_data *vc, unsigned int width, + unsigned int height, unsigned int user) +{ + int ret = 0; + + drm_vtcon_debug(vc, "width=%u, height=%u, user=%u\n", width, height, user); + + mutex_lock(&drm_vtcon_vc->lock); + + if (width > drm_vtcon_vc->max_cols || height > drm_vtcon_vc->max_rows) + ret = -EINVAL; + + mutex_unlock(&drm_vtcon_vc->lock); + + drm_vtcon_debug(vc, "ret=%d\n", ret); + + return ret; +} + +static void drm_vtcon_con_set_palette(struct vc_data *vc, + const unsigned char *table) +{ + drm_vtcon_debug(vc, "\n"); +} + +static int drm_vtcon_con_blank(struct vc_data *vc, int blank, int mode_switch) +{ + drm_vtcon_debug(vc, "(blank=%d, mode_switch=%d)\n", blank, mode_switch); + + mutex_lock(&drm_vtcon_vc->lock); + drm_vtcon_vc->blank = blank; + mutex_unlock(&drm_vtcon_vc->lock); + + schedule_work(&drm_vtcon_work); + + return 0; +} + +static void drm_vtcon_con_scrolldelta(struct vc_data *vc, int lines) +{ + drm_vtcon_debug(vc, "(lines=%d)\n", lines); +} + +static void drm_vtcon_con_cursor_draw(bool show) +{ + static unsigned short set_chr, saved_chr; + static int prev_x, prev_y; + struct vc_data *vc = vc_cons[fg_console].d; + unsigned short *pos; + + if (saved_chr) { + pos = &drm_vtcon_vc->text_buf[prev_x + (prev_y * drm_vtcon_vc->cols)]; + if (*pos == set_chr) + *pos = saved_chr; + saved_chr = 0; + } + + if (show) { + pos = &drm_vtcon_vc->text_buf[vc->vc_x + (vc->vc_y * drm_vtcon_vc->cols)]; + *pos = scr_readw((u16 *)vc->vc_pos); + saved_chr = *pos; + set_chr = *pos & 0xff00; + set_chr |= '_'; + *pos = set_chr; + prev_x = vc->vc_x; + prev_y = vc->vc_y; + } + + schedule_work(&drm_vtcon_work); +} + +static void drm_vtcon_con_cursor_timer_handler(struct timer_list *t) +{ + static bool show; + + show = !show; + drm_vtcon_con_cursor_draw(show); + mod_timer(t, jiffies + drm_vtcon_vc->cursor_blink_jiffies); +} + +static DEFINE_TIMER(drm_vtcon_con_cursor_timer, drm_vtcon_con_cursor_timer_handler); + +static void drm_vtcon_con_cursor(struct vc_data *vc, int mode) +{ + //drm_vtcon_debug(vc, "(mode=%d)\n", mode); + + switch (mode) { + case CM_ERASE: + drm_vtcon_con_cursor_draw(false); + del_timer_sync(&drm_vtcon_con_cursor_timer); + break; + case CM_MOVE: + case CM_DRAW: + drm_vtcon_vc->cursor_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms); + mod_timer(&drm_vtcon_con_cursor_timer, + jiffies + drm_vtcon_vc->cursor_blink_jiffies); + break; + } +} + +static bool drm_vtcon_con_scroll(struct vc_data *vc, unsigned int top, + unsigned int bottom, enum con_scroll dir, + unsigned int lines) +{ + size_t count; + + switch (dir) { + case SM_UP: + count = vc->vc_cols * (vc->vc_rows - lines); + memmove(drm_vtcon_vc->text_buf, drm_vtcon_vc->text_buf + vc->vc_cols, count * sizeof(u16)); + memset(drm_vtcon_vc->text_buf + count, 0, vc->vc_cols * lines * sizeof(u16)); + break; + case SM_DOWN: + drm_vtcon_debug(vc, "TODO\n"); + break; + } + + return false; +} + +static const struct consw drm_vtcon_consw = { + /* owner is not set, it blocks module unload */ + .con_startup = drm_vtcon_con_startup, + .con_init = drm_vtcon_con_init, + .con_deinit = drm_vtcon_con_deinit, + .con_clear = drm_vtcon_con_clear, + .con_putc = drm_vtcon_con_putc, + .con_putcs = drm_vtcon_con_putcs, + .con_cursor = drm_vtcon_con_cursor, + .con_scroll = drm_vtcon_con_scroll, + .con_switch = drm_vtcon_con_switch, + .con_blank = drm_vtcon_con_blank, + .con_resize = drm_vtcon_con_resize, + .con_set_palette = drm_vtcon_con_set_palette, + .con_scrolldelta = drm_vtcon_con_scrolldelta, +}; + +static int drm_vtcon_vc_set_max(struct drm_display_mode *mode) +{ + u16 *new_buf = NULL, *old_buf = NULL; + const struct font_desc *font; + unsigned int cols, rows, i; + size_t buf_len; + + /* only 8 bit wide and 8 or 16-bit high */ + font = get_default_font(mode->hdisplay, mode->vdisplay, + BIT(8 - 1), BIT(8 - 1) | BIT(16 - 1)); + if (!font) + return -ENODEV; + + pr_info("%s: font: %s\n", __func__, font->name); + + cols = mode->hdisplay / font->width; + rows = mode->vdisplay / font->height; + + pr_info("%s: ASKED: cols=%u, rows=%u\n", __func__, cols, rows); + + if (drm_vtcon_vc->max_cols == cols && drm_vtcon_vc->max_rows == rows && + drm_vtcon_vc->font == font) + return 0; + + buf_len = cols * rows * sizeof(u16); + if (buf_len > drm_vtcon_vc->buf_len) { + new_buf = kzalloc(buf_len, GFP_KERNEL); + if (!new_buf) + return -ENOMEM; + } + + mutex_lock(&drm_vtcon_vc->lock); + + if (new_buf) { + DRM_INFO("Allocated new buf: buf_len=%zu\n", buf_len); + old_buf = drm_vtcon_vc->text_buf; + drm_vtcon_vc->text_buf = new_buf; + drm_vtcon_vc->buf_len = buf_len; + } + + drm_vtcon_vc->max_cols = cols; + drm_vtcon_vc->max_rows = rows; + drm_vtcon_vc->font = font; + + mutex_unlock(&drm_vtcon_vc->lock); + + pr_info("%s: max_cols=%u, max_rows=%u\n", __func__, drm_vtcon_vc->max_cols, + drm_vtcon_vc->max_rows); + + console_lock(); + for (i = 0; i < 2; i++) + vc_resize(vc_cons[i].d, drm_vtcon_vc->max_cols, + drm_vtcon_vc->max_rows); + console_unlock(); + + kfree(old_buf); + + return 0; +} + +static int drm_vtcon_setup_dev(struct drm_vtcon *vtcon) +{ + struct drm_client_dev *client = vtcon->client; + struct drm_client_display *display; + struct drm_display_mode *mode; + int ret; + + display = drm_client_find_display(client->dev, 0, 0); + if (IS_ERR(display)) + return PTR_ERR(display); + if (!display) + return -ENOENT; + + mode = display->mode; + if (!mode) { + ret = -EINVAL; + goto err_free_display; + } + + ret = drm_vtcon_vc_set_max(mode); + if (ret) + goto err_free_display; + + pr_info("%s: cols=%u, rows=%u\n", __func__, drm_vtcon_vc->cols, drm_vtcon_vc->rows); + + vtcon->display = display; + + schedule_work(&drm_vtcon_work); + + return 0; + +err_free_display: + drm_client_display_free(display); + + return ret; +} + +static int drm_vtcon_client_hotplug(struct drm_client_dev *client) +{ + struct drm_vtcon *vtcon = client->private; + int ret = 0; + + if (!vtcon->display) + ret = drm_vtcon_setup_dev(vtcon); + + return ret; +} + +static struct drm_client_dev *vtcon_client; +static DEFINE_MUTEX(vtcon_client_lock); + +static int drm_vtcon_client_remove(struct drm_client_dev *client) +{ + struct drm_vtcon *vtcon = client->private; + struct drm_client_display *display = vtcon->display; + + mutex_lock(&vtcon_client_lock); + + vtcon_client = NULL; + + if (!display) + goto out_unlock; + + vtcon->display = NULL; + flush_work(&drm_vtcon_work); + kfree(vtcon->text_buf[0]); + kfree(vtcon->text_buf[1]); + drm_client_framebuffer_delete(vtcon->buffer); + vtcon->buffer = NULL; + drm_client_display_free(display); + +out_unlock: + mutex_unlock(&vtcon_client_lock); + + return 0; +} + +static const struct drm_client_funcs drm_vtcon_client_funcs = { + .name = "vtcon", + .remove = drm_vtcon_client_remove, + .hotplug = drm_vtcon_client_hotplug, +}; + +static struct drm_client_dev *drm_vtcon_client_new(unsigned int dev_id) +{ + struct drm_vtcon *vtcon = vtcon_instance; + struct drm_client_dev *client; + + if (vtcon->client) + return ERR_PTR(-EBUSY); + + client = drm_client_new_from_id(dev_id, &drm_vtcon_client_funcs); + if (IS_ERR(client)) + return client; + + vtcon->client = client; + client->private = vtcon; + + /* + * vc4 isn't done with it's setup when drm_dev_register() is called. + * It should have shouldn't it? + * So to keep it from crashing defer setup to hotplug... + */ + if (client->dev->mode_config.max_width) + drm_vtcon_client_hotplug(client); + + return 0; +} + +static void drm_vtcon_teardown(void) +{ + struct drm_vtcon *vtcon = vtcon_instance; + + if (!drm_vtcon_vc) + return; + + kfree(drm_vtcon_vc->text_buf); + mutex_destroy(&drm_vtcon_vc->lock); + kfree(drm_vtcon_vc); + kfree(vtcon); +} + +static int __init drm_vtcon_setup(void) +{ + struct drm_vtcon *vtcon; + + drm_vtcon_vc = kzalloc(sizeof(*drm_vtcon_vc), GFP_KERNEL); + vtcon = kzalloc(sizeof(*vtcon), GFP_KERNEL); + if (!drm_vtcon_vc || !vtcon) + goto err_free; + + drm_vtcon_vc->max_cols = 80; + drm_vtcon_vc->max_rows = 25; + drm_vtcon_vc->cols = drm_vtcon_vc->max_cols; + drm_vtcon_vc->rows = drm_vtcon_vc->max_rows; + pr_info("%s: cols=%u, rows=%u\n", __func__, drm_vtcon_vc->cols, drm_vtcon_vc->rows); + + drm_vtcon_vc->buf_len = drm_vtcon_vc->max_cols * drm_vtcon_vc->max_rows * sizeof(u16); + drm_vtcon_vc->text_buf = kzalloc(drm_vtcon_vc->buf_len, GFP_KERNEL); + if (!drm_vtcon_vc->text_buf) + goto err_free; + + mutex_init(&drm_vtcon_vc->lock); + vtcon_instance = vtcon; + + return 0; + +err_free: + kfree(drm_vtcon_vc); + kfree(vtcon); + + return -ENOMEM; +} + +static int __init drm_vtcon_module_init(void) +{ + int ret; + + if (drm_vtcon_dev_id < 0) + return 0; + + ret = drm_vtcon_setup(); + if (ret) + return ret; + + vtcon_client = drm_vtcon_client_new(drm_vtcon_dev_id); + if (IS_ERR(vtcon_client)) { + ret = PTR_ERR(vtcon_client); + drm_vtcon_dev_id = ret; + goto err_free; + } + + console_lock(); + ret = do_take_over_console(&drm_vtcon_consw, 0, 1, 0); + console_unlock(); + if (ret) + goto err_remove; + + return 0; + +err_remove: + drm_client_remove(vtcon_client); +err_free: + drm_vtcon_teardown(); + + return ret; +} +module_init(drm_vtcon_module_init); + +static void __exit drm_vtcon_module_exit(void) +{ + if (drm_vtcon_dev_id < 0) + return; + + mutex_lock(&vtcon_client_lock); + drm_client_remove(vtcon_client); + mutex_unlock(&vtcon_client_lock); + + console_lock(); + do_unbind_con_driver(&drm_vtcon_consw, 0, 1, 0); + do_unregister_con_driver(&drm_vtcon_consw); + console_unlock(); + + del_timer_sync(&drm_vtcon_con_cursor_timer); + flush_work(&drm_vtcon_work); + drm_vtcon_teardown(); +} +module_exit(drm_vtcon_module_exit); + +MODULE_LICENSE("GPL");