| Message ID | 1595622844-4669-1-git-send-email-455.rodrigo.alencar@gmail.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | video: fbdev: added driver for sharp memory lcd displays | expand |
Hi Rodrigo. On Fri, Jul 24, 2020 at 05:34:04PM -0300, Rodrigo Alencar wrote: > The supported displays are ls027b7dh01 (tested), ls044q7dh01, > ls013b7dh05, ls013b7dh03 > > Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@gmail.com> Thanks for submitting this driver. Unfortunately I have some bad news for you... The binding needs to be submitted as a seperate patch, and all new bindings must use the DT schema format (.yaml files). See Documentation/devicetree/bindings/*.rst for more info. And on top of this fbdev/ is in maintenance mode so no new drivers. New display drivers and panel drivers must go to gpu/drm/ and use the frameworks available there. It looks like what we have here is a panel driver. Look for other similar sharp panels in drm/panel/ to get an idea how to add support for these new panels. Soory, but looks forward for an updated patch. Sam > --- > .../devicetree/bindings/display/smemlcdfb.txt | 46 ++ > drivers/video/fbdev/Kconfig | 14 + > drivers/video/fbdev/Makefile | 1 + > drivers/video/fbdev/smemlcdfb.c | 485 ++++++++++++++++++ > 4 files changed, 546 insertions(+) > create mode 100644 Documentation/devicetree/bindings/display/smemlcdfb.txt > create mode 100644 drivers/video/fbdev/smemlcdfb.c > > diff --git a/Documentation/devicetree/bindings/display/smemlcdfb.txt b/Documentation/devicetree/bindings/display/smemlcdfb.txt > new file mode 100644 > index 000000000000..e33025dd3374 > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/smemlcdfb.txt > @@ -0,0 +1,46 @@ > +Sharp Memory LCD Linux Framebuffer Driver > + > +Required properties: > + - compatible: It should be "sharp,<model-no>". The supported displays are > + ls027b7dh01, ls044q7dh01, ls013b7dh05, ls013b7dh03. Maybe other > + monochromatic models can be supported with the current code. > + - reg: SPI chip select number for the device. > + - spi-max-frequency: Max SPI frequency to use. One must verify the datasheet. > + - spi-cs-high: Sharp Memory LCD needs chipselect high. > + > +Optional properties: > + - sharp,frames-per-sec: It should contain the desired frames per second. > + It does not represent the actual frame rate. Default: 10 > + - sharp,extmode-high: External COM Input signal is expected in EXTCOMIN port. > + This is recommended to reduce CPU and SPI Load. > + - pwm: If property "sharp,extmode-high" is specified, this is recommended. > + It should contain the pwm to use, according to > + Documentation/devicetree/bindings/pwm/pwm.txt > + Verify the display datasheet for the EXTCOMIN signal period > + - disp-gpios: The GPIO used to enable the display, if available. See > + Documentation/devicetree/bindings/gpio/gpio.txt for details. > + > +Examples: > + > +ls027b7dh01: smemlcd@0 { > + compatible = "sharp,ls027b7dh01"; > + reg = <0>; > + spi-max-frequency = <1000000>; > + spi-cs-high; > + disp-gpios = <&gpio0 7>; > + disp-active-high; > + sharp,extmode-high; > + pwms = <&pwm 0 100000000>; > +}; > + > +ls013b7dh05: smemlcd@3 { > + compatible = "sharp,ls013b7dh05"; > + reg = <3>; > + spi-max-frequency = <1000000>; > + spi-cs-high; > + disp-gpios = <&gpio0 13>; > + disp-active-high; > + sharp,extmode-high; > + pwms = <&pwm 0 50000000>; > + sharp,frames-per-sec = <20>; > +}; > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > index b2c9dd4f0cb5..0fff47a59d8b 100644 > --- a/drivers/video/fbdev/Kconfig > +++ b/drivers/video/fbdev/Kconfig > @@ -2221,6 +2221,20 @@ config FB_SSD1307 > This driver implements support for the Solomon SSD1307 > OLED controller over I2C. > > +config FB_SMEMLCD > + tristate "Sharp Memory LCD framebuffer support" > + depends on FB && SPI > + depends on OF > + depends on GPIOLIB || COMPILE_TEST > + select FB_SYS_FOPS > + select FB_SYS_FILLRECT > + select FB_SYS_COPYAREA > + select FB_SYS_IMAGEBLIT > + select FB_DEFERRED_IO > + select PWM > + help > + This driver implements support for the Sharp Memory LCD > + > config FB_SM712 > tristate "Silicon Motion SM712 framebuffer support" > depends on FB && PCI > diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile > index cad4fb64442a..5c58dfd8ac08 100644 > --- a/drivers/video/fbdev/Makefile > +++ b/drivers/video/fbdev/Makefile > @@ -128,6 +128,7 @@ obj-$(CONFIG_FB_OF) += offb.o > obj-$(CONFIG_FB_MX3) += mx3fb.o > obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o > obj-$(CONFIG_FB_SSD1307) += ssd1307fb.o > +obj-$(CONFIG_FB_SMEMLCD) += smemlcdfb.o > obj-$(CONFIG_FB_SIMPLE) += simplefb.o > > # the test framebuffer is last > diff --git a/drivers/video/fbdev/smemlcdfb.c b/drivers/video/fbdev/smemlcdfb.c > new file mode 100644 > index 000000000000..54a0c57b6713 > --- /dev/null > +++ b/drivers/video/fbdev/smemlcdfb.c > @@ -0,0 +1,485 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (C) 2019 IMBEL http://www.imbel.gov.br > + * Rodrigo Alencar <alencar.fmce@imbel.gov.br> > + */ > + > +#include <linux/fb.h> > +#include <linux/bitrev.h> > +#include <linux/gpio/consumer.h> > +#include <linux/spi/spi.h> > +#include <linux/module.h> > +#include <linux/property.h> > +#include <linux/pwm.h> > + > +#define SMEMLCD_DATA_UPDATE 0x80 > +#define SMEMLCD_FRAME_INVERSION 0x40 > +#define SMEMLCD_ALL_CLEAR 0x20 > +#define SMEMLCD_DUMMY_DATA 0x00 > + > +struct smemlcd_info { > + u32 width; > + u32 height; > +}; > + > +struct smemlcd_par { > + struct spi_device *spi; > + struct fb_info *info; > + struct pwm_device *extcomin_pwm; > + struct gpio_desc *disp; > + struct delayed_work d_work; > + struct mutex update_lock; > + > + u8 *spi_buf; > + > + bool extmode; > + u32 spi_width; > + u32 vmem_width; > + > + u8 vcom; > + u32 start; > + u32 height; > +}; > + > +static const struct fb_fix_screeninfo smemlcd_fix = { > + .id = "Sharp Memory LCD", > + .type = FB_TYPE_PACKED_PIXELS, > + .visual = FB_VISUAL_MONO10, > + .xpanstep = 0, > + .ypanstep = 0, > + .ywrapstep = 0, > + .accel = FB_ACCEL_NONE, > +}; > + > +static const struct fb_var_screeninfo smemlcd_var = { > + .bits_per_pixel = 1, > + .red = { .length = 1 }, > + .green = { .length = 1 }, > + .blue = { .length = 1 }, > +}; > + > +static void smemlcd_update(struct smemlcd_par *par) > +{ > + struct spi_device *spi = par->spi; > + u8 *vmem = par->info->screen_buffer; > + u8 *buf_ptr = par->spi_buf; > + int ret; > + u32 i,j; > + > + if (par->start + par->height > par->info->var.yres) { > + par->start = 0; > + par->height = 0; > + } > + /* go to start line */ > + vmem += par->start * par->vmem_width; > + /* update vcom */ > + par->vcom ^= SMEMLCD_FRAME_INVERSION; > + /* mode selection */ > + *(buf_ptr++) = (par->height)? (SMEMLCD_DATA_UPDATE | par->vcom) : par->vcom; > + > + /* not all SPI masters have LSB-first mode, bitrev8 is used */ > + for (i = par->start + 1; i < par->start + par->height + 1; i++) { > + /* gate line address */ > + *(buf_ptr++) = bitrev8(i); > + /* data writing */ > + for (j = 0; j < par->spi_width; j++) > + *(buf_ptr++) = bitrev8(*(vmem++)); > + /* dummy data */ > + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; > + /* video memory alignment */ > + for (; j < par->vmem_width; j++) > + vmem++; > + } > + /* dummy data */ > + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; > + > + ret = spi_write(spi, &(par->spi_buf[0]), par->height * (par->spi_width + 2) + 2); > + if (ret < 0) > + dev_err(&spi->dev, "Couldn't send SPI command.\n"); > + > + par->start = U32_MAX; > + par->height = 0; > +} > + > +static void smemlcd_frame(struct smemlcd_par *par, u32 req_start, u32 req_height) > +{ > + u32 end = par->start + par->height; > + u32 req_end = req_start + req_height; > + if (req_end > par->info->var.yres) > + req_end = par->info->var.yres; > + if (par->start > req_start) > + par->start = req_start; > + if (end < req_end || end > par->info->var.yres) > + end = req_end; > + par->height = end - par->start; > +} > + > +static void smemlcd_fillrect(struct fb_info *info, const struct fb_fillrect *rect) > +{ > + struct smemlcd_par *par = info->par; > + sys_fillrect(info, rect); > + > + mutex_lock(&par->update_lock); > + smemlcd_frame(par, rect->dy, rect->height); > + if(par->extmode) > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > +} > + > +static void smemlcd_imageblit(struct fb_info *info, const struct fb_image *image) > +{ > + struct smemlcd_par *par = info->par; > + sys_imageblit(info, image); > + > + mutex_lock(&par->update_lock); > + smemlcd_frame(par, image->dy, image->height); > + if(par->extmode) > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > +} > + > +static void smemlcd_copyarea(struct fb_info *info, const struct fb_copyarea *area) > +{ > + struct smemlcd_par *par = info->par; > + sys_copyarea(info, area); > + > + mutex_lock(&par->update_lock); > + smemlcd_frame(par, area->dy, area->height); > + if(par->extmode) > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > +} > + > +static ssize_t smemlcd_write(struct fb_info *info, const char __user * buf, size_t count, loff_t * ppos) > +{ > + ssize_t ret; > + struct smemlcd_par *par = info->par; > + u32 req_start, req_height; > + u32 offset = (u32) * ppos; > + > + ret = fb_sys_write(info, buf, count, ppos); > + if (ret > 0) { > + mutex_lock(&par->update_lock); > + req_start = max((int)(offset / par->vmem_width), 0); > + req_height = ret / par->vmem_width + 1; > + smemlcd_frame(par, req_start, req_height); > + if(par->extmode) > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > + } > + > + return ret; > +} > + > +static int smemlcd_blank(int blank_mode, struct fb_info *info) > +{ > + struct smemlcd_par *par = info->par; > + > + if (par->disp) { > + if (blank_mode != FB_BLANK_UNBLANK) > + gpiod_set_value_cansleep(par->disp, 0); > + else > + gpiod_set_value_cansleep(par->disp, 1); > + } > + > + return 0; > +} > + > +static void smemlcd_deferred_io(struct fb_info *info, struct list_head *pagelist) > +{ > + struct smemlcd_par *par = info->par; > + > + mutex_lock(&par->update_lock); > + > + if (!list_empty(pagelist)) { > + struct page *cur; > + u32 req_start; > + u32 req_height = (PAGE_SIZE / par->vmem_width) + 1; > + > + list_for_each_entry(cur, pagelist, lru) { > + req_start = (cur->index << PAGE_SHIFT) / par->vmem_width; > + smemlcd_frame(par, req_start, req_height); > + } > + } > + > + if(par->extmode) > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > +} > + > +static void smemlcd_update_work(struct work_struct *work) > +{ > + struct smemlcd_par *par = container_of(work, struct smemlcd_par, d_work.work); > + struct fb_info *info = par->info; > + > + mutex_lock(&par->update_lock); > + smemlcd_update(par); > + mutex_unlock(&par->update_lock); > + > + if (!par->extmode) > + schedule_delayed_work(&par->d_work, info->fbdefio->delay); > +} > + > +static const struct fb_ops smemlcd_ops = { > + .owner = THIS_MODULE, > + .fb_read = fb_sys_read, > + .fb_write = smemlcd_write, > + .fb_fillrect = smemlcd_fillrect, > + .fb_copyarea = smemlcd_copyarea, > + .fb_imageblit = smemlcd_imageblit, > + .fb_blank = smemlcd_blank, > +}; > + > +static struct smemlcd_info ls027b7dh01_info = { > + .width = 400, > + .height = 240, > +}; > + > +static struct smemlcd_info ls044q7dh01_info = { > + .width = 320, > + .height = 240, > +}; > + > +static struct smemlcd_info ls013b7dh05_info = { > + .width = 144, > + .height = 168, > +}; > + > +static struct smemlcd_info ls013b7dh03_info = { > + .width = 128, > + .height = 128, > +}; > + > +static const struct of_device_id smemlcd_of_match[] = { > + { > + .compatible = "sharp,ls027b7dh01", > + .data = (void *)&ls027b7dh01_info, > + }, > + { > + .compatible = "sharp,ls044q7dh01", > + .data = (void *)&ls044q7dh01_info, > + }, > + { > + .compatible = "sharp,ls013b7dh05", > + .data = (void *)&ls013b7dh05_info, > + }, > + { > + .compatible = "sharp,ls013b7dh03", > + .data = (void *)&ls013b7dh03_info, > + }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, smemlcd_of_match); > + > +static int smemlcd_probe(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + struct fb_info *info; > + struct smemlcd_par *par; > + const struct smemlcd_info *devinfo; > + struct fb_deferred_io *smemlcd_defio; > + struct pwm_state state; > + u32 vmem_size, fps; > + void *vmem; > + int ret; > + > + info = framebuffer_alloc(sizeof(struct smemlcd_par), dev); > + if (!info) > + return -ENOMEM; > + > + par = info->par; > + par->info = info; > + par->spi = spi; > + > + devinfo = device_get_match_data(dev); > + > + mutex_init(&par->update_lock); > + INIT_DELAYED_WORK(&par->d_work, smemlcd_update_work); > + par->spi_width = devinfo->width / 8; > + par->vmem_width = ((devinfo->width + 31) & ~31) >> 3; > + par->vcom = 0; > + par->start = 0; > + par->height = 0; > + > + par->disp = devm_gpiod_get_optional(dev, "disp", GPIOD_OUT_LOW); > + if (IS_ERR(par->disp)) { > + ret = PTR_ERR(par->disp); > + dev_err(dev, "Failed to get DISP gpio: %d\n", ret); > + goto free_fb; > + } > + > + par->spi_buf = kzalloc(devinfo->height * (par->spi_width + 2) + 2, GFP_KERNEL); > + if (!par->spi_buf) { > + ret = -ENOMEM; > + dev_err(dev, "Failed to allocate data for spi transfers.\n"); > + goto free_fb; > + } > + > + vmem_size = par->vmem_width * devinfo->height; > + > + vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(vmem_size)); > + if (!vmem) { > + ret = -ENOMEM; > + dev_err(dev, "Failed to allocate video memory.\n"); > + goto free_spi_buf; > + } > + > + par->extmode = device_property_read_bool(dev, "sharp,extmode-high"); > + > + if (device_property_read_u32(dev, "sharp,frames-per-sec", &fps)) > + fps = 10; > + > + smemlcd_defio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL); > + if (!smemlcd_defio) { > + dev_err(dev, "Couldn't allocate deferred io.\n"); > + ret = -ENOMEM; > + goto free_vmem; > + } > + > + smemlcd_defio->delay = HZ / fps; > + smemlcd_defio->deferred_io = &smemlcd_deferred_io; > + > + info->var = smemlcd_var; > + info->var.xres = devinfo->width; > + info->var.xres_virtual = devinfo->width; > + info->var.yres = devinfo->height; > + info->var.yres_virtual = devinfo->height; > + > + info->screen_buffer = vmem; > + info->screen_size = vmem_size; > + > + info->fbops = &smemlcd_ops; > + info->fix = smemlcd_fix; > + info->fix.line_length = par->vmem_width; > + info->fix.smem_start = __pa(vmem); > + info->fix.smem_len = vmem_size; > + > + info->fbdefio = smemlcd_defio; > + > + fb_deferred_io_init(info); > + > + spi_set_drvdata(spi, par); > + > + if (par->extmode) { > + par->extcomin_pwm = pwm_get(dev, NULL); > + if (IS_ERR(par->extcomin_pwm)) { > + ret = PTR_ERR(par->extcomin_pwm); > + dev_warn(dev, "Failed to get EXTCOMIN pwm: %d\n", ret); > + par->extcomin_pwm = NULL; > + } else { > + > + pwm_init_state(par->extcomin_pwm, &state); > + > + if (!state.period) > + state.period = NSEC_PER_SEC/fps; > + > + state.enabled = true; > + state.duty_cycle = state.period/2; > + > + ret = pwm_apply_state(par->extcomin_pwm, &state); > + if (ret) > + dev_warn(dev, "failed to apply EXTCOMIN pwm state: %d\n", ret); > + } > + } else { > + par->extcomin_pwm = NULL; > + } > + > + if (par->disp) > + gpiod_set_value_cansleep(par->disp, 1); > + > + /* spi test by clearing the display */ > + par->spi_buf[0] = SMEMLCD_ALL_CLEAR; > + par->spi_buf[1] = SMEMLCD_DUMMY_DATA; > + ret = spi_write(spi, &(par->spi_buf[0]), 2); > + if (ret < 0){ > + dev_err(dev, "Couldn't send SPI command\n"); > + goto disable_hw; > + } > + > + ret = register_framebuffer(info); > + if (ret < 0) { > + dev_err(dev, "Failed to register framebuffer\n"); > + goto disable_hw; > + } > + > + dev_info(dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); > + > + if (!par->extmode) > + schedule_delayed_work(&par->d_work, smemlcd_defio->delay); > + > + return 0; > + > +disable_hw: > + if (par->disp) > + gpiod_set_value_cansleep(par->disp, 0); > + if (par->extcomin_pwm) { > + pwm_disable(par->extcomin_pwm); > + pwm_put(par->extcomin_pwm); > + } > + fb_deferred_io_cleanup(info); > +free_vmem: > + kfree(vmem); > +free_spi_buf: > + kfree(par->spi_buf); > +free_fb: > + cancel_delayed_work_sync(&par->d_work); > + mutex_destroy(&par->update_lock); > + framebuffer_release(info); > + > + return ret; > +} > + > +static int smemlcd_remove(struct spi_device *spi) > +{ > + struct smemlcd_par *par = dev_get_drvdata(&spi->dev); > + struct fb_info *info = par->info; > + > + cancel_delayed_work_sync(&par->d_work); > + > + fb_deferred_io_cleanup(info); > + > + unregister_framebuffer(info); > + > + if (par->disp) > + gpiod_set_value_cansleep(par->disp, 0); > + > + if (par->extcomin_pwm) { > + pwm_disable(par->extcomin_pwm); > + pwm_put(par->extcomin_pwm); > + } > + > + fb_deferred_io_cleanup(info); > + __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); > + > + kfree(par->spi_buf); > + > + mutex_destroy(&par->update_lock); > + > + framebuffer_release(info); > + > + return 0; > +} > + > +static const struct spi_device_id smemlcd_spi_id[] = { > + {"ls027b7dh01", 0}, > + {"ls044q7dh01", 0}, > + {"ls013b7dh05", 0}, > + {"ls013b7dh03", 0}, > + {} > +}; > +MODULE_DEVICE_TABLE(spi, smemlcd_spi_id); > + > +static struct spi_driver smemlcd_driver = { > + .probe = smemlcd_probe, > + .remove = smemlcd_remove, > + .id_table = smemlcd_spi_id, > + .driver = { > + .name = "smemlcdfb", > + .of_match_table = smemlcd_of_match, > + }, > +}; > +module_spi_driver(smemlcd_driver); > + > +MODULE_AUTHOR("Rodrigo Alencar <455.rodrigo.alencar@gmail.com>"); > +MODULE_DESCRIPTION("Sharp Memory LCD Linux Framebuffer Driver"); > +MODULE_LICENSE("GPL"); > -- > 2.23.0.rc1 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
On Sun, Jul 26, 2020 at 7:22 PM Sam Ravnborg <sam@ravnborg.org> wrote: > > Hi Rodrigo. > > On Fri, Jul 24, 2020 at 05:34:04PM -0300, Rodrigo Alencar wrote: > > The supported displays are ls027b7dh01 (tested), ls044q7dh01, > > ls013b7dh05, ls013b7dh03 > > > > Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@gmail.com> > > Thanks for submitting this driver. > Unfortunately I have some bad news for you... > > The binding needs to be submitted as a seperate patch, and all new > bindings must use the DT schema format (.yaml files). > See Documentation/devicetree/bindings/*.rst for more info. > > And on top of this fbdev/ is in maintenance mode so no new drivers. > New display drivers and panel drivers must go to gpu/drm/ > and use the frameworks available there. > > It looks like what we have here is a panel driver. > Look for other similar sharp panels in drm/panel/ to get an idea how to > add support for these new panels. Since it's directly used, probably drm/tiny since we haven't yet unified panel (used by other drm_device drivers) and tiny (stand-alone drivers for simple panels). -Daniel > > Soory, but looks forward for an updated patch. > > Sam > > > > --- > > .../devicetree/bindings/display/smemlcdfb.txt | 46 ++ > > drivers/video/fbdev/Kconfig | 14 + > > drivers/video/fbdev/Makefile | 1 + > > drivers/video/fbdev/smemlcdfb.c | 485 ++++++++++++++++++ > > 4 files changed, 546 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/display/smemlcdfb.txt > > create mode 100644 drivers/video/fbdev/smemlcdfb.c > > > > diff --git a/Documentation/devicetree/bindings/display/smemlcdfb.txt b/Documentation/devicetree/bindings/display/smemlcdfb.txt > > new file mode 100644 > > index 000000000000..e33025dd3374 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/display/smemlcdfb.txt > > @@ -0,0 +1,46 @@ > > +Sharp Memory LCD Linux Framebuffer Driver > > + > > +Required properties: > > + - compatible: It should be "sharp,<model-no>". The supported displays are > > + ls027b7dh01, ls044q7dh01, ls013b7dh05, ls013b7dh03. Maybe other > > + monochromatic models can be supported with the current code. > > + - reg: SPI chip select number for the device. > > + - spi-max-frequency: Max SPI frequency to use. One must verify the datasheet. > > + - spi-cs-high: Sharp Memory LCD needs chipselect high. > > + > > +Optional properties: > > + - sharp,frames-per-sec: It should contain the desired frames per second. > > + It does not represent the actual frame rate. Default: 10 > > + - sharp,extmode-high: External COM Input signal is expected in EXTCOMIN port. > > + This is recommended to reduce CPU and SPI Load. > > + - pwm: If property "sharp,extmode-high" is specified, this is recommended. > > + It should contain the pwm to use, according to > > + Documentation/devicetree/bindings/pwm/pwm.txt > > + Verify the display datasheet for the EXTCOMIN signal period > > + - disp-gpios: The GPIO used to enable the display, if available. See > > + Documentation/devicetree/bindings/gpio/gpio.txt for details. > > + > > +Examples: > > + > > +ls027b7dh01: smemlcd@0 { > > + compatible = "sharp,ls027b7dh01"; > > + reg = <0>; > > + spi-max-frequency = <1000000>; > > + spi-cs-high; > > + disp-gpios = <&gpio0 7>; > > + disp-active-high; > > + sharp,extmode-high; > > + pwms = <&pwm 0 100000000>; > > +}; > > + > > +ls013b7dh05: smemlcd@3 { > > + compatible = "sharp,ls013b7dh05"; > > + reg = <3>; > > + spi-max-frequency = <1000000>; > > + spi-cs-high; > > + disp-gpios = <&gpio0 13>; > > + disp-active-high; > > + sharp,extmode-high; > > + pwms = <&pwm 0 50000000>; > > + sharp,frames-per-sec = <20>; > > +}; > > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > > index b2c9dd4f0cb5..0fff47a59d8b 100644 > > --- a/drivers/video/fbdev/Kconfig > > +++ b/drivers/video/fbdev/Kconfig > > @@ -2221,6 +2221,20 @@ config FB_SSD1307 > > This driver implements support for the Solomon SSD1307 > > OLED controller over I2C. > > > > +config FB_SMEMLCD > > + tristate "Sharp Memory LCD framebuffer support" > > + depends on FB && SPI > > + depends on OF > > + depends on GPIOLIB || COMPILE_TEST > > + select FB_SYS_FOPS > > + select FB_SYS_FILLRECT > > + select FB_SYS_COPYAREA > > + select FB_SYS_IMAGEBLIT > > + select FB_DEFERRED_IO > > + select PWM > > + help > > + This driver implements support for the Sharp Memory LCD > > + > > config FB_SM712 > > tristate "Silicon Motion SM712 framebuffer support" > > depends on FB && PCI > > diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile > > index cad4fb64442a..5c58dfd8ac08 100644 > > --- a/drivers/video/fbdev/Makefile > > +++ b/drivers/video/fbdev/Makefile > > @@ -128,6 +128,7 @@ obj-$(CONFIG_FB_OF) += offb.o > > obj-$(CONFIG_FB_MX3) += mx3fb.o > > obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o > > obj-$(CONFIG_FB_SSD1307) += ssd1307fb.o > > +obj-$(CONFIG_FB_SMEMLCD) += smemlcdfb.o > > obj-$(CONFIG_FB_SIMPLE) += simplefb.o > > > > # the test framebuffer is last > > diff --git a/drivers/video/fbdev/smemlcdfb.c b/drivers/video/fbdev/smemlcdfb.c > > new file mode 100644 > > index 000000000000..54a0c57b6713 > > --- /dev/null > > +++ b/drivers/video/fbdev/smemlcdfb.c > > @@ -0,0 +1,485 @@ > > +// SPDX-License-Identifier: GPL-2.0-or-later > > +/* > > + * Copyright (C) 2019 IMBEL http://www.imbel.gov.br > > + * Rodrigo Alencar <alencar.fmce@imbel.gov.br> > > + */ > > + > > +#include <linux/fb.h> > > +#include <linux/bitrev.h> > > +#include <linux/gpio/consumer.h> > > +#include <linux/spi/spi.h> > > +#include <linux/module.h> > > +#include <linux/property.h> > > +#include <linux/pwm.h> > > + > > +#define SMEMLCD_DATA_UPDATE 0x80 > > +#define SMEMLCD_FRAME_INVERSION 0x40 > > +#define SMEMLCD_ALL_CLEAR 0x20 > > +#define SMEMLCD_DUMMY_DATA 0x00 > > + > > +struct smemlcd_info { > > + u32 width; > > + u32 height; > > +}; > > + > > +struct smemlcd_par { > > + struct spi_device *spi; > > + struct fb_info *info; > > + struct pwm_device *extcomin_pwm; > > + struct gpio_desc *disp; > > + struct delayed_work d_work; > > + struct mutex update_lock; > > + > > + u8 *spi_buf; > > + > > + bool extmode; > > + u32 spi_width; > > + u32 vmem_width; > > + > > + u8 vcom; > > + u32 start; > > + u32 height; > > +}; > > + > > +static const struct fb_fix_screeninfo smemlcd_fix = { > > + .id = "Sharp Memory LCD", > > + .type = FB_TYPE_PACKED_PIXELS, > > + .visual = FB_VISUAL_MONO10, > > + .xpanstep = 0, > > + .ypanstep = 0, > > + .ywrapstep = 0, > > + .accel = FB_ACCEL_NONE, > > +}; > > + > > +static const struct fb_var_screeninfo smemlcd_var = { > > + .bits_per_pixel = 1, > > + .red = { .length = 1 }, > > + .green = { .length = 1 }, > > + .blue = { .length = 1 }, > > +}; > > + > > +static void smemlcd_update(struct smemlcd_par *par) > > +{ > > + struct spi_device *spi = par->spi; > > + u8 *vmem = par->info->screen_buffer; > > + u8 *buf_ptr = par->spi_buf; > > + int ret; > > + u32 i,j; > > + > > + if (par->start + par->height > par->info->var.yres) { > > + par->start = 0; > > + par->height = 0; > > + } > > + /* go to start line */ > > + vmem += par->start * par->vmem_width; > > + /* update vcom */ > > + par->vcom ^= SMEMLCD_FRAME_INVERSION; > > + /* mode selection */ > > + *(buf_ptr++) = (par->height)? (SMEMLCD_DATA_UPDATE | par->vcom) : par->vcom; > > + > > + /* not all SPI masters have LSB-first mode, bitrev8 is used */ > > + for (i = par->start + 1; i < par->start + par->height + 1; i++) { > > + /* gate line address */ > > + *(buf_ptr++) = bitrev8(i); > > + /* data writing */ > > + for (j = 0; j < par->spi_width; j++) > > + *(buf_ptr++) = bitrev8(*(vmem++)); > > + /* dummy data */ > > + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; > > + /* video memory alignment */ > > + for (; j < par->vmem_width; j++) > > + vmem++; > > + } > > + /* dummy data */ > > + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; > > + > > + ret = spi_write(spi, &(par->spi_buf[0]), par->height * (par->spi_width + 2) + 2); > > + if (ret < 0) > > + dev_err(&spi->dev, "Couldn't send SPI command.\n"); > > + > > + par->start = U32_MAX; > > + par->height = 0; > > +} > > + > > +static void smemlcd_frame(struct smemlcd_par *par, u32 req_start, u32 req_height) > > +{ > > + u32 end = par->start + par->height; > > + u32 req_end = req_start + req_height; > > + if (req_end > par->info->var.yres) > > + req_end = par->info->var.yres; > > + if (par->start > req_start) > > + par->start = req_start; > > + if (end < req_end || end > par->info->var.yres) > > + end = req_end; > > + par->height = end - par->start; > > +} > > + > > +static void smemlcd_fillrect(struct fb_info *info, const struct fb_fillrect *rect) > > +{ > > + struct smemlcd_par *par = info->par; > > + sys_fillrect(info, rect); > > + > > + mutex_lock(&par->update_lock); > > + smemlcd_frame(par, rect->dy, rect->height); > > + if(par->extmode) > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > +} > > + > > +static void smemlcd_imageblit(struct fb_info *info, const struct fb_image *image) > > +{ > > + struct smemlcd_par *par = info->par; > > + sys_imageblit(info, image); > > + > > + mutex_lock(&par->update_lock); > > + smemlcd_frame(par, image->dy, image->height); > > + if(par->extmode) > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > +} > > + > > +static void smemlcd_copyarea(struct fb_info *info, const struct fb_copyarea *area) > > +{ > > + struct smemlcd_par *par = info->par; > > + sys_copyarea(info, area); > > + > > + mutex_lock(&par->update_lock); > > + smemlcd_frame(par, area->dy, area->height); > > + if(par->extmode) > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > +} > > + > > +static ssize_t smemlcd_write(struct fb_info *info, const char __user * buf, size_t count, loff_t * ppos) > > +{ > > + ssize_t ret; > > + struct smemlcd_par *par = info->par; > > + u32 req_start, req_height; > > + u32 offset = (u32) * ppos; > > + > > + ret = fb_sys_write(info, buf, count, ppos); > > + if (ret > 0) { > > + mutex_lock(&par->update_lock); > > + req_start = max((int)(offset / par->vmem_width), 0); > > + req_height = ret / par->vmem_width + 1; > > + smemlcd_frame(par, req_start, req_height); > > + if(par->extmode) > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > + } > > + > > + return ret; > > +} > > + > > +static int smemlcd_blank(int blank_mode, struct fb_info *info) > > +{ > > + struct smemlcd_par *par = info->par; > > + > > + if (par->disp) { > > + if (blank_mode != FB_BLANK_UNBLANK) > > + gpiod_set_value_cansleep(par->disp, 0); > > + else > > + gpiod_set_value_cansleep(par->disp, 1); > > + } > > + > > + return 0; > > +} > > + > > +static void smemlcd_deferred_io(struct fb_info *info, struct list_head *pagelist) > > +{ > > + struct smemlcd_par *par = info->par; > > + > > + mutex_lock(&par->update_lock); > > + > > + if (!list_empty(pagelist)) { > > + struct page *cur; > > + u32 req_start; > > + u32 req_height = (PAGE_SIZE / par->vmem_width) + 1; > > + > > + list_for_each_entry(cur, pagelist, lru) { > > + req_start = (cur->index << PAGE_SHIFT) / par->vmem_width; > > + smemlcd_frame(par, req_start, req_height); > > + } > > + } > > + > > + if(par->extmode) > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > +} > > + > > +static void smemlcd_update_work(struct work_struct *work) > > +{ > > + struct smemlcd_par *par = container_of(work, struct smemlcd_par, d_work.work); > > + struct fb_info *info = par->info; > > + > > + mutex_lock(&par->update_lock); > > + smemlcd_update(par); > > + mutex_unlock(&par->update_lock); > > + > > + if (!par->extmode) > > + schedule_delayed_work(&par->d_work, info->fbdefio->delay); > > +} > > + > > +static const struct fb_ops smemlcd_ops = { > > + .owner = THIS_MODULE, > > + .fb_read = fb_sys_read, > > + .fb_write = smemlcd_write, > > + .fb_fillrect = smemlcd_fillrect, > > + .fb_copyarea = smemlcd_copyarea, > > + .fb_imageblit = smemlcd_imageblit, > > + .fb_blank = smemlcd_blank, > > +}; > > + > > +static struct smemlcd_info ls027b7dh01_info = { > > + .width = 400, > > + .height = 240, > > +}; > > + > > +static struct smemlcd_info ls044q7dh01_info = { > > + .width = 320, > > + .height = 240, > > +}; > > + > > +static struct smemlcd_info ls013b7dh05_info = { > > + .width = 144, > > + .height = 168, > > +}; > > + > > +static struct smemlcd_info ls013b7dh03_info = { > > + .width = 128, > > + .height = 128, > > +}; > > + > > +static const struct of_device_id smemlcd_of_match[] = { > > + { > > + .compatible = "sharp,ls027b7dh01", > > + .data = (void *)&ls027b7dh01_info, > > + }, > > + { > > + .compatible = "sharp,ls044q7dh01", > > + .data = (void *)&ls044q7dh01_info, > > + }, > > + { > > + .compatible = "sharp,ls013b7dh05", > > + .data = (void *)&ls013b7dh05_info, > > + }, > > + { > > + .compatible = "sharp,ls013b7dh03", > > + .data = (void *)&ls013b7dh03_info, > > + }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, smemlcd_of_match); > > + > > +static int smemlcd_probe(struct spi_device *spi) > > +{ > > + struct device *dev = &spi->dev; > > + struct fb_info *info; > > + struct smemlcd_par *par; > > + const struct smemlcd_info *devinfo; > > + struct fb_deferred_io *smemlcd_defio; > > + struct pwm_state state; > > + u32 vmem_size, fps; > > + void *vmem; > > + int ret; > > + > > + info = framebuffer_alloc(sizeof(struct smemlcd_par), dev); > > + if (!info) > > + return -ENOMEM; > > + > > + par = info->par; > > + par->info = info; > > + par->spi = spi; > > + > > + devinfo = device_get_match_data(dev); > > + > > + mutex_init(&par->update_lock); > > + INIT_DELAYED_WORK(&par->d_work, smemlcd_update_work); > > + par->spi_width = devinfo->width / 8; > > + par->vmem_width = ((devinfo->width + 31) & ~31) >> 3; > > + par->vcom = 0; > > + par->start = 0; > > + par->height = 0; > > + > > + par->disp = devm_gpiod_get_optional(dev, "disp", GPIOD_OUT_LOW); > > + if (IS_ERR(par->disp)) { > > + ret = PTR_ERR(par->disp); > > + dev_err(dev, "Failed to get DISP gpio: %d\n", ret); > > + goto free_fb; > > + } > > + > > + par->spi_buf = kzalloc(devinfo->height * (par->spi_width + 2) + 2, GFP_KERNEL); > > + if (!par->spi_buf) { > > + ret = -ENOMEM; > > + dev_err(dev, "Failed to allocate data for spi transfers.\n"); > > + goto free_fb; > > + } > > + > > + vmem_size = par->vmem_width * devinfo->height; > > + > > + vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(vmem_size)); > > + if (!vmem) { > > + ret = -ENOMEM; > > + dev_err(dev, "Failed to allocate video memory.\n"); > > + goto free_spi_buf; > > + } > > + > > + par->extmode = device_property_read_bool(dev, "sharp,extmode-high"); > > + > > + if (device_property_read_u32(dev, "sharp,frames-per-sec", &fps)) > > + fps = 10; > > + > > + smemlcd_defio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL); > > + if (!smemlcd_defio) { > > + dev_err(dev, "Couldn't allocate deferred io.\n"); > > + ret = -ENOMEM; > > + goto free_vmem; > > + } > > + > > + smemlcd_defio->delay = HZ / fps; > > + smemlcd_defio->deferred_io = &smemlcd_deferred_io; > > + > > + info->var = smemlcd_var; > > + info->var.xres = devinfo->width; > > + info->var.xres_virtual = devinfo->width; > > + info->var.yres = devinfo->height; > > + info->var.yres_virtual = devinfo->height; > > + > > + info->screen_buffer = vmem; > > + info->screen_size = vmem_size; > > + > > + info->fbops = &smemlcd_ops; > > + info->fix = smemlcd_fix; > > + info->fix.line_length = par->vmem_width; > > + info->fix.smem_start = __pa(vmem); > > + info->fix.smem_len = vmem_size; > > + > > + info->fbdefio = smemlcd_defio; > > + > > + fb_deferred_io_init(info); > > + > > + spi_set_drvdata(spi, par); > > + > > + if (par->extmode) { > > + par->extcomin_pwm = pwm_get(dev, NULL); > > + if (IS_ERR(par->extcomin_pwm)) { > > + ret = PTR_ERR(par->extcomin_pwm); > > + dev_warn(dev, "Failed to get EXTCOMIN pwm: %d\n", ret); > > + par->extcomin_pwm = NULL; > > + } else { > > + > > + pwm_init_state(par->extcomin_pwm, &state); > > + > > + if (!state.period) > > + state.period = NSEC_PER_SEC/fps; > > + > > + state.enabled = true; > > + state.duty_cycle = state.period/2; > > + > > + ret = pwm_apply_state(par->extcomin_pwm, &state); > > + if (ret) > > + dev_warn(dev, "failed to apply EXTCOMIN pwm state: %d\n", ret); > > + } > > + } else { > > + par->extcomin_pwm = NULL; > > + } > > + > > + if (par->disp) > > + gpiod_set_value_cansleep(par->disp, 1); > > + > > + /* spi test by clearing the display */ > > + par->spi_buf[0] = SMEMLCD_ALL_CLEAR; > > + par->spi_buf[1] = SMEMLCD_DUMMY_DATA; > > + ret = spi_write(spi, &(par->spi_buf[0]), 2); > > + if (ret < 0){ > > + dev_err(dev, "Couldn't send SPI command\n"); > > + goto disable_hw; > > + } > > + > > + ret = register_framebuffer(info); > > + if (ret < 0) { > > + dev_err(dev, "Failed to register framebuffer\n"); > > + goto disable_hw; > > + } > > + > > + dev_info(dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); > > + > > + if (!par->extmode) > > + schedule_delayed_work(&par->d_work, smemlcd_defio->delay); > > + > > + return 0; > > + > > +disable_hw: > > + if (par->disp) > > + gpiod_set_value_cansleep(par->disp, 0); > > + if (par->extcomin_pwm) { > > + pwm_disable(par->extcomin_pwm); > > + pwm_put(par->extcomin_pwm); > > + } > > + fb_deferred_io_cleanup(info); > > +free_vmem: > > + kfree(vmem); > > +free_spi_buf: > > + kfree(par->spi_buf); > > +free_fb: > > + cancel_delayed_work_sync(&par->d_work); > > + mutex_destroy(&par->update_lock); > > + framebuffer_release(info); > > + > > + return ret; > > +} > > + > > +static int smemlcd_remove(struct spi_device *spi) > > +{ > > + struct smemlcd_par *par = dev_get_drvdata(&spi->dev); > > + struct fb_info *info = par->info; > > + > > + cancel_delayed_work_sync(&par->d_work); > > + > > + fb_deferred_io_cleanup(info); > > + > > + unregister_framebuffer(info); > > + > > + if (par->disp) > > + gpiod_set_value_cansleep(par->disp, 0); > > + > > + if (par->extcomin_pwm) { > > + pwm_disable(par->extcomin_pwm); > > + pwm_put(par->extcomin_pwm); > > + } > > + > > + fb_deferred_io_cleanup(info); > > + __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); > > + > > + kfree(par->spi_buf); > > + > > + mutex_destroy(&par->update_lock); > > + > > + framebuffer_release(info); > > + > > + return 0; > > +} > > + > > +static const struct spi_device_id smemlcd_spi_id[] = { > > + {"ls027b7dh01", 0}, > > + {"ls044q7dh01", 0}, > > + {"ls013b7dh05", 0}, > > + {"ls013b7dh03", 0}, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(spi, smemlcd_spi_id); > > + > > +static struct spi_driver smemlcd_driver = { > > + .probe = smemlcd_probe, > > + .remove = smemlcd_remove, > > + .id_table = smemlcd_spi_id, > > + .driver = { > > + .name = "smemlcdfb", > > + .of_match_table = smemlcd_of_match, > > + }, > > +}; > > +module_spi_driver(smemlcd_driver); > > + > > +MODULE_AUTHOR("Rodrigo Alencar <455.rodrigo.alencar@gmail.com>"); > > +MODULE_DESCRIPTION("Sharp Memory LCD Linux Framebuffer Driver"); > > +MODULE_LICENSE("GPL"); > > -- > > 2.23.0.rc1 > > > > _______________________________________________ > > dri-devel mailing list > > dri-devel@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff --git a/Documentation/devicetree/bindings/display/smemlcdfb.txt b/Documentation/devicetree/bindings/display/smemlcdfb.txt new file mode 100644 index 000000000000..e33025dd3374 --- /dev/null +++ b/Documentation/devicetree/bindings/display/smemlcdfb.txt @@ -0,0 +1,46 @@ +Sharp Memory LCD Linux Framebuffer Driver + +Required properties: + - compatible: It should be "sharp,<model-no>". The supported displays are + ls027b7dh01, ls044q7dh01, ls013b7dh05, ls013b7dh03. Maybe other + monochromatic models can be supported with the current code. + - reg: SPI chip select number for the device. + - spi-max-frequency: Max SPI frequency to use. One must verify the datasheet. + - spi-cs-high: Sharp Memory LCD needs chipselect high. + +Optional properties: + - sharp,frames-per-sec: It should contain the desired frames per second. + It does not represent the actual frame rate. Default: 10 + - sharp,extmode-high: External COM Input signal is expected in EXTCOMIN port. + This is recommended to reduce CPU and SPI Load. + - pwm: If property "sharp,extmode-high" is specified, this is recommended. + It should contain the pwm to use, according to + Documentation/devicetree/bindings/pwm/pwm.txt + Verify the display datasheet for the EXTCOMIN signal period + - disp-gpios: The GPIO used to enable the display, if available. See + Documentation/devicetree/bindings/gpio/gpio.txt for details. + +Examples: + +ls027b7dh01: smemlcd@0 { + compatible = "sharp,ls027b7dh01"; + reg = <0>; + spi-max-frequency = <1000000>; + spi-cs-high; + disp-gpios = <&gpio0 7>; + disp-active-high; + sharp,extmode-high; + pwms = <&pwm 0 100000000>; +}; + +ls013b7dh05: smemlcd@3 { + compatible = "sharp,ls013b7dh05"; + reg = <3>; + spi-max-frequency = <1000000>; + spi-cs-high; + disp-gpios = <&gpio0 13>; + disp-active-high; + sharp,extmode-high; + pwms = <&pwm 0 50000000>; + sharp,frames-per-sec = <20>; +}; diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index b2c9dd4f0cb5..0fff47a59d8b 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -2221,6 +2221,20 @@ config FB_SSD1307 This driver implements support for the Solomon SSD1307 OLED controller over I2C. +config FB_SMEMLCD + tristate "Sharp Memory LCD framebuffer support" + depends on FB && SPI + depends on OF + depends on GPIOLIB || COMPILE_TEST + select FB_SYS_FOPS + select FB_SYS_FILLRECT + select FB_SYS_COPYAREA + select FB_SYS_IMAGEBLIT + select FB_DEFERRED_IO + select PWM + help + This driver implements support for the Sharp Memory LCD + config FB_SM712 tristate "Silicon Motion SM712 framebuffer support" depends on FB && PCI diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile index cad4fb64442a..5c58dfd8ac08 100644 --- a/drivers/video/fbdev/Makefile +++ b/drivers/video/fbdev/Makefile @@ -128,6 +128,7 @@ obj-$(CONFIG_FB_OF) += offb.o obj-$(CONFIG_FB_MX3) += mx3fb.o obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o obj-$(CONFIG_FB_SSD1307) += ssd1307fb.o +obj-$(CONFIG_FB_SMEMLCD) += smemlcdfb.o obj-$(CONFIG_FB_SIMPLE) += simplefb.o # the test framebuffer is last diff --git a/drivers/video/fbdev/smemlcdfb.c b/drivers/video/fbdev/smemlcdfb.c new file mode 100644 index 000000000000..54a0c57b6713 --- /dev/null +++ b/drivers/video/fbdev/smemlcdfb.c @@ -0,0 +1,485 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2019 IMBEL http://www.imbel.gov.br + * Rodrigo Alencar <alencar.fmce@imbel.gov.br> + */ + +#include <linux/fb.h> +#include <linux/bitrev.h> +#include <linux/gpio/consumer.h> +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/pwm.h> + +#define SMEMLCD_DATA_UPDATE 0x80 +#define SMEMLCD_FRAME_INVERSION 0x40 +#define SMEMLCD_ALL_CLEAR 0x20 +#define SMEMLCD_DUMMY_DATA 0x00 + +struct smemlcd_info { + u32 width; + u32 height; +}; + +struct smemlcd_par { + struct spi_device *spi; + struct fb_info *info; + struct pwm_device *extcomin_pwm; + struct gpio_desc *disp; + struct delayed_work d_work; + struct mutex update_lock; + + u8 *spi_buf; + + bool extmode; + u32 spi_width; + u32 vmem_width; + + u8 vcom; + u32 start; + u32 height; +}; + +static const struct fb_fix_screeninfo smemlcd_fix = { + .id = "Sharp Memory LCD", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_MONO10, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .accel = FB_ACCEL_NONE, +}; + +static const struct fb_var_screeninfo smemlcd_var = { + .bits_per_pixel = 1, + .red = { .length = 1 }, + .green = { .length = 1 }, + .blue = { .length = 1 }, +}; + +static void smemlcd_update(struct smemlcd_par *par) +{ + struct spi_device *spi = par->spi; + u8 *vmem = par->info->screen_buffer; + u8 *buf_ptr = par->spi_buf; + int ret; + u32 i,j; + + if (par->start + par->height > par->info->var.yres) { + par->start = 0; + par->height = 0; + } + /* go to start line */ + vmem += par->start * par->vmem_width; + /* update vcom */ + par->vcom ^= SMEMLCD_FRAME_INVERSION; + /* mode selection */ + *(buf_ptr++) = (par->height)? (SMEMLCD_DATA_UPDATE | par->vcom) : par->vcom; + + /* not all SPI masters have LSB-first mode, bitrev8 is used */ + for (i = par->start + 1; i < par->start + par->height + 1; i++) { + /* gate line address */ + *(buf_ptr++) = bitrev8(i); + /* data writing */ + for (j = 0; j < par->spi_width; j++) + *(buf_ptr++) = bitrev8(*(vmem++)); + /* dummy data */ + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; + /* video memory alignment */ + for (; j < par->vmem_width; j++) + vmem++; + } + /* dummy data */ + *(buf_ptr++) = SMEMLCD_DUMMY_DATA; + + ret = spi_write(spi, &(par->spi_buf[0]), par->height * (par->spi_width + 2) + 2); + if (ret < 0) + dev_err(&spi->dev, "Couldn't send SPI command.\n"); + + par->start = U32_MAX; + par->height = 0; +} + +static void smemlcd_frame(struct smemlcd_par *par, u32 req_start, u32 req_height) +{ + u32 end = par->start + par->height; + u32 req_end = req_start + req_height; + if (req_end > par->info->var.yres) + req_end = par->info->var.yres; + if (par->start > req_start) + par->start = req_start; + if (end < req_end || end > par->info->var.yres) + end = req_end; + par->height = end - par->start; +} + +static void smemlcd_fillrect(struct fb_info *info, const struct fb_fillrect *rect) +{ + struct smemlcd_par *par = info->par; + sys_fillrect(info, rect); + + mutex_lock(&par->update_lock); + smemlcd_frame(par, rect->dy, rect->height); + if(par->extmode) + smemlcd_update(par); + mutex_unlock(&par->update_lock); +} + +static void smemlcd_imageblit(struct fb_info *info, const struct fb_image *image) +{ + struct smemlcd_par *par = info->par; + sys_imageblit(info, image); + + mutex_lock(&par->update_lock); + smemlcd_frame(par, image->dy, image->height); + if(par->extmode) + smemlcd_update(par); + mutex_unlock(&par->update_lock); +} + +static void smemlcd_copyarea(struct fb_info *info, const struct fb_copyarea *area) +{ + struct smemlcd_par *par = info->par; + sys_copyarea(info, area); + + mutex_lock(&par->update_lock); + smemlcd_frame(par, area->dy, area->height); + if(par->extmode) + smemlcd_update(par); + mutex_unlock(&par->update_lock); +} + +static ssize_t smemlcd_write(struct fb_info *info, const char __user * buf, size_t count, loff_t * ppos) +{ + ssize_t ret; + struct smemlcd_par *par = info->par; + u32 req_start, req_height; + u32 offset = (u32) * ppos; + + ret = fb_sys_write(info, buf, count, ppos); + if (ret > 0) { + mutex_lock(&par->update_lock); + req_start = max((int)(offset / par->vmem_width), 0); + req_height = ret / par->vmem_width + 1; + smemlcd_frame(par, req_start, req_height); + if(par->extmode) + smemlcd_update(par); + mutex_unlock(&par->update_lock); + } + + return ret; +} + +static int smemlcd_blank(int blank_mode, struct fb_info *info) +{ + struct smemlcd_par *par = info->par; + + if (par->disp) { + if (blank_mode != FB_BLANK_UNBLANK) + gpiod_set_value_cansleep(par->disp, 0); + else + gpiod_set_value_cansleep(par->disp, 1); + } + + return 0; +} + +static void smemlcd_deferred_io(struct fb_info *info, struct list_head *pagelist) +{ + struct smemlcd_par *par = info->par; + + mutex_lock(&par->update_lock); + + if (!list_empty(pagelist)) { + struct page *cur; + u32 req_start; + u32 req_height = (PAGE_SIZE / par->vmem_width) + 1; + + list_for_each_entry(cur, pagelist, lru) { + req_start = (cur->index << PAGE_SHIFT) / par->vmem_width; + smemlcd_frame(par, req_start, req_height); + } + } + + if(par->extmode) + smemlcd_update(par); + mutex_unlock(&par->update_lock); +} + +static void smemlcd_update_work(struct work_struct *work) +{ + struct smemlcd_par *par = container_of(work, struct smemlcd_par, d_work.work); + struct fb_info *info = par->info; + + mutex_lock(&par->update_lock); + smemlcd_update(par); + mutex_unlock(&par->update_lock); + + if (!par->extmode) + schedule_delayed_work(&par->d_work, info->fbdefio->delay); +} + +static const struct fb_ops smemlcd_ops = { + .owner = THIS_MODULE, + .fb_read = fb_sys_read, + .fb_write = smemlcd_write, + .fb_fillrect = smemlcd_fillrect, + .fb_copyarea = smemlcd_copyarea, + .fb_imageblit = smemlcd_imageblit, + .fb_blank = smemlcd_blank, +}; + +static struct smemlcd_info ls027b7dh01_info = { + .width = 400, + .height = 240, +}; + +static struct smemlcd_info ls044q7dh01_info = { + .width = 320, + .height = 240, +}; + +static struct smemlcd_info ls013b7dh05_info = { + .width = 144, + .height = 168, +}; + +static struct smemlcd_info ls013b7dh03_info = { + .width = 128, + .height = 128, +}; + +static const struct of_device_id smemlcd_of_match[] = { + { + .compatible = "sharp,ls027b7dh01", + .data = (void *)&ls027b7dh01_info, + }, + { + .compatible = "sharp,ls044q7dh01", + .data = (void *)&ls044q7dh01_info, + }, + { + .compatible = "sharp,ls013b7dh05", + .data = (void *)&ls013b7dh05_info, + }, + { + .compatible = "sharp,ls013b7dh03", + .data = (void *)&ls013b7dh03_info, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, smemlcd_of_match); + +static int smemlcd_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct fb_info *info; + struct smemlcd_par *par; + const struct smemlcd_info *devinfo; + struct fb_deferred_io *smemlcd_defio; + struct pwm_state state; + u32 vmem_size, fps; + void *vmem; + int ret; + + info = framebuffer_alloc(sizeof(struct smemlcd_par), dev); + if (!info) + return -ENOMEM; + + par = info->par; + par->info = info; + par->spi = spi; + + devinfo = device_get_match_data(dev); + + mutex_init(&par->update_lock); + INIT_DELAYED_WORK(&par->d_work, smemlcd_update_work); + par->spi_width = devinfo->width / 8; + par->vmem_width = ((devinfo->width + 31) & ~31) >> 3; + par->vcom = 0; + par->start = 0; + par->height = 0; + + par->disp = devm_gpiod_get_optional(dev, "disp", GPIOD_OUT_LOW); + if (IS_ERR(par->disp)) { + ret = PTR_ERR(par->disp); + dev_err(dev, "Failed to get DISP gpio: %d\n", ret); + goto free_fb; + } + + par->spi_buf = kzalloc(devinfo->height * (par->spi_width + 2) + 2, GFP_KERNEL); + if (!par->spi_buf) { + ret = -ENOMEM; + dev_err(dev, "Failed to allocate data for spi transfers.\n"); + goto free_fb; + } + + vmem_size = par->vmem_width * devinfo->height; + + vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(vmem_size)); + if (!vmem) { + ret = -ENOMEM; + dev_err(dev, "Failed to allocate video memory.\n"); + goto free_spi_buf; + } + + par->extmode = device_property_read_bool(dev, "sharp,extmode-high"); + + if (device_property_read_u32(dev, "sharp,frames-per-sec", &fps)) + fps = 10; + + smemlcd_defio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL); + if (!smemlcd_defio) { + dev_err(dev, "Couldn't allocate deferred io.\n"); + ret = -ENOMEM; + goto free_vmem; + } + + smemlcd_defio->delay = HZ / fps; + smemlcd_defio->deferred_io = &smemlcd_deferred_io; + + info->var = smemlcd_var; + info->var.xres = devinfo->width; + info->var.xres_virtual = devinfo->width; + info->var.yres = devinfo->height; + info->var.yres_virtual = devinfo->height; + + info->screen_buffer = vmem; + info->screen_size = vmem_size; + + info->fbops = &smemlcd_ops; + info->fix = smemlcd_fix; + info->fix.line_length = par->vmem_width; + info->fix.smem_start = __pa(vmem); + info->fix.smem_len = vmem_size; + + info->fbdefio = smemlcd_defio; + + fb_deferred_io_init(info); + + spi_set_drvdata(spi, par); + + if (par->extmode) { + par->extcomin_pwm = pwm_get(dev, NULL); + if (IS_ERR(par->extcomin_pwm)) { + ret = PTR_ERR(par->extcomin_pwm); + dev_warn(dev, "Failed to get EXTCOMIN pwm: %d\n", ret); + par->extcomin_pwm = NULL; + } else { + + pwm_init_state(par->extcomin_pwm, &state); + + if (!state.period) + state.period = NSEC_PER_SEC/fps; + + state.enabled = true; + state.duty_cycle = state.period/2; + + ret = pwm_apply_state(par->extcomin_pwm, &state); + if (ret) + dev_warn(dev, "failed to apply EXTCOMIN pwm state: %d\n", ret); + } + } else { + par->extcomin_pwm = NULL; + } + + if (par->disp) + gpiod_set_value_cansleep(par->disp, 1); + + /* spi test by clearing the display */ + par->spi_buf[0] = SMEMLCD_ALL_CLEAR; + par->spi_buf[1] = SMEMLCD_DUMMY_DATA; + ret = spi_write(spi, &(par->spi_buf[0]), 2); + if (ret < 0){ + dev_err(dev, "Couldn't send SPI command\n"); + goto disable_hw; + } + + ret = register_framebuffer(info); + if (ret < 0) { + dev_err(dev, "Failed to register framebuffer\n"); + goto disable_hw; + } + + dev_info(dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); + + if (!par->extmode) + schedule_delayed_work(&par->d_work, smemlcd_defio->delay); + + return 0; + +disable_hw: + if (par->disp) + gpiod_set_value_cansleep(par->disp, 0); + if (par->extcomin_pwm) { + pwm_disable(par->extcomin_pwm); + pwm_put(par->extcomin_pwm); + } + fb_deferred_io_cleanup(info); +free_vmem: + kfree(vmem); +free_spi_buf: + kfree(par->spi_buf); +free_fb: + cancel_delayed_work_sync(&par->d_work); + mutex_destroy(&par->update_lock); + framebuffer_release(info); + + return ret; +} + +static int smemlcd_remove(struct spi_device *spi) +{ + struct smemlcd_par *par = dev_get_drvdata(&spi->dev); + struct fb_info *info = par->info; + + cancel_delayed_work_sync(&par->d_work); + + fb_deferred_io_cleanup(info); + + unregister_framebuffer(info); + + if (par->disp) + gpiod_set_value_cansleep(par->disp, 0); + + if (par->extcomin_pwm) { + pwm_disable(par->extcomin_pwm); + pwm_put(par->extcomin_pwm); + } + + fb_deferred_io_cleanup(info); + __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); + + kfree(par->spi_buf); + + mutex_destroy(&par->update_lock); + + framebuffer_release(info); + + return 0; +} + +static const struct spi_device_id smemlcd_spi_id[] = { + {"ls027b7dh01", 0}, + {"ls044q7dh01", 0}, + {"ls013b7dh05", 0}, + {"ls013b7dh03", 0}, + {} +}; +MODULE_DEVICE_TABLE(spi, smemlcd_spi_id); + +static struct spi_driver smemlcd_driver = { + .probe = smemlcd_probe, + .remove = smemlcd_remove, + .id_table = smemlcd_spi_id, + .driver = { + .name = "smemlcdfb", + .of_match_table = smemlcd_of_match, + }, +}; +module_spi_driver(smemlcd_driver); + +MODULE_AUTHOR("Rodrigo Alencar <455.rodrigo.alencar@gmail.com>"); +MODULE_DESCRIPTION("Sharp Memory LCD Linux Framebuffer Driver"); +MODULE_LICENSE("GPL");
The supported displays are ls027b7dh01 (tested), ls044q7dh01, ls013b7dh05, ls013b7dh03 Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@gmail.com> --- .../devicetree/bindings/display/smemlcdfb.txt | 46 ++ drivers/video/fbdev/Kconfig | 14 + drivers/video/fbdev/Makefile | 1 + drivers/video/fbdev/smemlcdfb.c | 485 ++++++++++++++++++ 4 files changed, 546 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/smemlcdfb.txt create mode 100644 drivers/video/fbdev/smemlcdfb.c