We have currently panel-generic-dpi driver, which is a combined driver for dummy panels and also for DVI output. The aim is to split the panel-generic-dpi into two, one for fixed size dummy panels connected via DPI, and the other (this) for variable resolution output which supports DDC channel (in practice a DVI framer chip connected to DPI output). Original i2c code by: Ricardo Salveti de Araujo <ricardo.salveti@xxxxxxxxxxxxx> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> --- drivers/video/omap2/displays/Kconfig | 7 + drivers/video/omap2/displays/Makefile | 1 + drivers/video/omap2/displays/panel-dvi.c | 363 ++++++++++++++++++++++++++++++ include/video/omap-panel-dvi.h | 37 +++ 4 files changed, 408 insertions(+), 0 deletions(-) create mode 100644 drivers/video/omap2/displays/panel-dvi.c create mode 100644 include/video/omap-panel-dvi.h diff --git a/drivers/video/omap2/displays/Kconfig b/drivers/video/omap2/displays/Kconfig index 6ddb401..16e3eab 100644 --- a/drivers/video/omap2/displays/Kconfig +++ b/drivers/video/omap2/displays/Kconfig @@ -10,6 +10,13 @@ config PANEL_GENERIC_DPI Supports LCD Panel used in TI SDP3430 and EVM boards, OMAP3517 EVM boards and CM-T35. +config PANEL_DVI + tristate "DVI output" + depends on OMAP2_DSS_DPI + help + Driver for external monitors, connected via DVI. The driver uses i2c + to read EDID information from the monitor. + config PANEL_LGPHILIPS_LB035Q02 tristate "LG.Philips LB035Q02 LCD Panel" depends on OMAP2_DSS_DPI && SPI diff --git a/drivers/video/omap2/displays/Makefile b/drivers/video/omap2/displays/Makefile index d90f73c..abfda35 100644 --- a/drivers/video/omap2/displays/Makefile +++ b/drivers/video/omap2/displays/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_PANEL_GENERIC_DPI) += panel-generic-dpi.o +obj-$(CONFIG_PANEL_DVI) += panel-dvi.o obj-$(CONFIG_PANEL_LGPHILIPS_LB035Q02) += panel-lgphilips-lb035q02.o obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o diff --git a/drivers/video/omap2/displays/panel-dvi.c b/drivers/video/omap2/displays/panel-dvi.c new file mode 100644 index 0000000..03eb14a --- /dev/null +++ b/drivers/video/omap2/displays/panel-dvi.c @@ -0,0 +1,363 @@ +/* + * DVI output support + * + * Copyright (C) 2011 Texas Instruments Inc + * Author: Tomi Valkeinen <tomi.valkeinen@xxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <video/omapdss.h> +#include <linux/i2c.h> +#include <drm/drm_edid.h> + +#include <video/omap-panel-dvi.h> + +static const struct omap_video_timings panel_dvi_default_timings = { + .x_res = 640, + .y_res = 480, + + .pixel_clock = 23500, + + .hfp = 48, + .hsw = 32, + .hbp = 80, + + .vfp = 3, + .vsw = 4, + .vbp = 7, +}; + +struct panel_drv_data { + struct omap_dss_device *dssdev; + + struct mutex lock; +}; + +static inline struct panel_dvi_platform_data +*get_pdata(const struct omap_dss_device *dssdev) +{ + return dssdev->data; +} + +static int panel_dvi_power_on(struct omap_dss_device *dssdev) +{ + struct panel_dvi_platform_data *pdata = get_pdata(dssdev); + int r; + + if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) + return 0; + + r = omapdss_dpi_display_enable(dssdev); + if (r) + goto err0; + + if (pdata->platform_enable) { + r = pdata->platform_enable(dssdev); + if (r) + goto err1; + } + + return 0; +err1: + omapdss_dpi_display_disable(dssdev); +err0: + return r; +} + +static void panel_dvi_power_off(struct omap_dss_device *dssdev) +{ + struct panel_dvi_platform_data *pdata = get_pdata(dssdev); + + if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) + return; + + if (pdata->platform_disable) + pdata->platform_disable(dssdev); + + omapdss_dpi_display_disable(dssdev); +} + +static int panel_dvi_probe(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata; + + ddata = kzalloc(sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + dssdev->panel.timings = panel_dvi_default_timings; + dssdev->panel.config = OMAP_DSS_LCD_TFT; + + ddata->dssdev = dssdev; + mutex_init(&ddata->lock); + + dev_set_drvdata(&dssdev->dev, ddata); + + return 0; +} + +static void __exit panel_dvi_remove(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + + mutex_lock(&ddata->lock); + + dev_set_drvdata(&dssdev->dev, NULL); + + mutex_unlock(&ddata->lock); + + kfree(ddata); +} + +static int panel_dvi_enable(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + int r; + + mutex_lock(&ddata->lock); + + r = panel_dvi_power_on(dssdev); + if (r == 0) + dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; + + mutex_unlock(&ddata->lock); + + return r; +} + +static void panel_dvi_disable(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + + mutex_lock(&ddata->lock); + + panel_dvi_power_off(dssdev); + + dssdev->state = OMAP_DSS_DISPLAY_DISABLED; + + mutex_unlock(&ddata->lock); +} + +static int panel_dvi_suspend(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + + mutex_lock(&ddata->lock); + + panel_dvi_power_off(dssdev); + + dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED; + + mutex_unlock(&ddata->lock); + + return 0; +} + +static int panel_dvi_resume(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + int r; + + mutex_lock(&ddata->lock); + + r = panel_dvi_power_on(dssdev); + if (r == 0) + dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; + + mutex_unlock(&ddata->lock); + + return r; +} + +static void panel_dvi_set_timings(struct omap_dss_device *dssdev, + struct omap_video_timings *timings) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + + mutex_lock(&ddata->lock); + dpi_set_timings(dssdev, timings); + mutex_unlock(&ddata->lock); +} + +static void panel_dvi_get_timings(struct omap_dss_device *dssdev, + struct omap_video_timings *timings) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + + mutex_lock(&ddata->lock); + *timings = dssdev->panel.timings; + mutex_unlock(&ddata->lock); +} + +static int panel_dvi_check_timings(struct omap_dss_device *dssdev, + struct omap_video_timings *timings) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + int r; + + mutex_lock(&ddata->lock); + r = dpi_check_timings(dssdev, timings); + mutex_unlock(&ddata->lock); + + return r; +} + + +static int panel_dvi_ddc_read(struct i2c_adapter *adapter, + unsigned char *buf, u16 count, u8 offset) +{ + int r, retries; + + for (retries = 3; retries > 0; retries--) { + struct i2c_msg msgs[] = { + { + .addr = DDC_ADDR, + .flags = 0, + .len = 1, + .buf = &offset, + }, { + .addr = DDC_ADDR, + .flags = I2C_M_RD, + .len = count, + .buf = buf, + } + }; + + r = i2c_transfer(adapter, msgs, 2); + if (r == 2) + return 0; + + if (r != -EAGAIN) + break; + } + + return r < 0 ? r : -EIO; +} + +static int panel_dvi_read_edid(struct omap_dss_device *dssdev, + u8 *edid, int len) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + struct panel_dvi_platform_data *pdata = get_pdata(dssdev); + struct i2c_adapter *adapter; + int r, l, bytes_read; + + mutex_lock(&ddata->lock); + + if (pdata->i2c_bus_num == 0) { + r = -ENODEV; + goto err; + } + + adapter = i2c_get_adapter(pdata->i2c_bus_num); + if (!adapter) { + dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n", + pdata->i2c_bus_num); + r = -EINVAL; + goto err; + } + + l = min(EDID_LENGTH, len); + r = panel_dvi_ddc_read(adapter, edid, l, 0); + if (r) + goto err; + + bytes_read = l; + + /* if there are extensions, read second block */ + if (len > EDID_LENGTH && edid[0x7e] > 0) { + l = min(EDID_LENGTH, len - EDID_LENGTH); + + r = panel_dvi_ddc_read(adapter, edid + EDID_LENGTH, + l, EDID_LENGTH); + if (r) + goto err; + + bytes_read += l; + } + + mutex_unlock(&ddata->lock); + + return bytes_read; + +err: + mutex_unlock(&ddata->lock); + return r; +} + +static bool panel_dvi_detect(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev); + struct panel_dvi_platform_data *pdata = get_pdata(dssdev); + struct i2c_adapter *adapter; + unsigned char out; + int r; + + mutex_lock(&ddata->lock); + + if (pdata->i2c_bus_num == 0) + goto out; + + adapter = i2c_get_adapter(pdata->i2c_bus_num); + if (!adapter) + goto out; + + r = panel_dvi_ddc_read(adapter, &out, 1, 0); + + mutex_unlock(&ddata->lock); + + return r == 0; + +out: + mutex_unlock(&ddata->lock); + return true; +} + +static struct omap_dss_driver panel_dvi_driver = { + .probe = panel_dvi_probe, + .remove = __exit_p(panel_dvi_remove), + + .enable = panel_dvi_enable, + .disable = panel_dvi_disable, + .suspend = panel_dvi_suspend, + .resume = panel_dvi_resume, + + .set_timings = panel_dvi_set_timings, + .get_timings = panel_dvi_get_timings, + .check_timings = panel_dvi_check_timings, + + .read_edid = panel_dvi_read_edid, + .detect = panel_dvi_detect, + + .driver = { + .name = "dvi", + .owner = THIS_MODULE, + }, +}; + +static int __init panel_dvi_init(void) +{ + return omap_dss_register_driver(&panel_dvi_driver); +} + +static void __exit panel_dvi_exit(void) +{ + omap_dss_unregister_driver(&panel_dvi_driver); +} + +module_init(panel_dvi_init); +module_exit(panel_dvi_exit); +MODULE_LICENSE("GPL"); diff --git a/include/video/omap-panel-dvi.h b/include/video/omap-panel-dvi.h new file mode 100644 index 0000000..87ad567 --- /dev/null +++ b/include/video/omap-panel-dvi.h @@ -0,0 +1,37 @@ +/* + * Header for DVI output driver + * + * Copyright (C) 2011 Texas Instruments Inc + * Author: Tomi Valkeinen <tomi.valkeinen@xxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __OMAP_PANEL_DVI_H +#define __OMAP_PANEL_DVI_H + +struct omap_dss_device; + +/** + * struct panel_dvi_platform_data - panel driver configuration data + * @platform_enable: platform specific panel enable function + * @platform_disable: platform specific panel disable function + * @i2c_bus_num: i2c bus id for the panel + */ +struct panel_dvi_platform_data { + int (*platform_enable)(struct omap_dss_device *dssdev); + void (*platform_disable)(struct omap_dss_device *dssdev); + u16 i2c_bus_num; +}; + +#endif /* __OMAP_PANEL_DVI_H */ -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
