diff options
Diffstat (limited to 'drivers/video/mcde/display-vuib500-dpi.c')
| -rw-r--r-- | drivers/video/mcde/display-vuib500-dpi.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/drivers/video/mcde/display-vuib500-dpi.c b/drivers/video/mcde/display-vuib500-dpi.c new file mode 100644 index 00000000000..2bd5b990608 --- /dev/null +++ b/drivers/video/mcde/display-vuib500-dpi.c @@ -0,0 +1,215 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * ST-Ericsson MCDE DPI display driver + * The VUIB500 is an user interface board the can be attached to an HREF. It + * supports the DPI pixel interface and converts this to an analog VGA signal, + * which can be connected to a monitor using a DSUB connector. The VUIB board + * uses an external power supply of 5V. + * + * Author: Marcel Tunnissen <marcel.tuennissen@stericsson.com> + * for ST-Ericsson. + * + * License terms: GNU General Public License (GPL), version 2. + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/gpio.h> + +#include <video/mcde_display.h> +#include <video/mcde_display-vuib500-dpi.h> + +#define DPI_DISP_TRACE dev_dbg(&ddev->dev, "%s\n", __func__) + +static int try_video_mode(struct mcde_display_device *ddev, + struct mcde_video_mode *video_mode); +static int set_video_mode(struct mcde_display_device *ddev, + struct mcde_video_mode *video_mode); + +static int __devinit dpi_display_probe(struct mcde_display_device *ddev) +{ + int ret = 0; + struct mcde_display_dpi_platform_data *pdata = ddev->dev.platform_data; + DPI_DISP_TRACE; + + if (pdata == NULL) { + dev_err(&ddev->dev, "%s:Platform data missing\n", __func__); + ret = -EINVAL; + goto no_pdata; + } + + if (ddev->port->type != MCDE_PORTTYPE_DPI) { + dev_err(&ddev->dev, + "%s:Invalid port type %d\n", + __func__, ddev->port->type); + ret = -EINVAL; + goto invalid_port_type; + } + + ddev->try_video_mode = try_video_mode; + ddev->set_video_mode = set_video_mode; + dev_info(&ddev->dev, "DPI display probed\n"); + + goto out; +invalid_port_type: +no_pdata: +out: + return ret; +} + +static int __devexit dpi_display_remove(struct mcde_display_device *ddev) +{ + DPI_DISP_TRACE; + + ddev->set_power_mode(ddev, MCDE_DISPLAY_PM_OFF); + + return 0; +} + +static int dpi_display_resume(struct mcde_display_device *ddev) +{ + int ret; + DPI_DISP_TRACE; + + /* set_power_mode will handle call platform_enable */ + ret = ddev->set_power_mode(ddev, MCDE_DISPLAY_PM_STANDBY); + if (ret < 0) + dev_warn(&ddev->dev, "%s:Failed to resume display\n" + , __func__); + return ret; +} + +static int dpi_display_suspend(struct mcde_display_device *ddev, + pm_message_t state) +{ + int ret; + DPI_DISP_TRACE; + + /* set_power_mode will handle call platform_disable */ + ret = ddev->set_power_mode(ddev, MCDE_DISPLAY_PM_OFF); + if (ret < 0) + dev_warn(&ddev->dev, "%s:Failed to suspend display\n" + , __func__); + return ret; +} + +static void print_vmode(struct mcde_video_mode *vmode) +{ + pr_debug("resolution: %dx%d\n", vmode->xres, vmode->yres); + pr_debug(" pixclock: %d\n", vmode->pixclock); + pr_debug(" hbp: %d\n", vmode->hbp); + pr_debug(" hfp: %d\n", vmode->hfp); + pr_debug(" hsw: %d\n", vmode->hsw); + pr_debug(" vbp: %d\n", vmode->vbp); + pr_debug(" vfp: %d\n", vmode->vfp); + pr_debug(" vsw: %d\n", vmode->vsw); + pr_debug("interlaced: %s\n", vmode->interlaced ? "true" : "false"); +} + +/* Taken from the programmed value of the LCD clock in PRCMU */ +#define PIX_CLK_FREQ 25000000 +#define VMODE_XRES 640 +#define VMODE_YRES 480 + +static int try_video_mode( + struct mcde_display_device *ddev, struct mcde_video_mode *video_mode) +{ + int res = -EINVAL; + DPI_DISP_TRACE; + + if (ddev == NULL || video_mode == NULL) { + dev_warn(&ddev->dev, "%s:ddev = NULL or video_mode = NULL\n", + __func__); + return res; + } + + if (video_mode->xres == VMODE_XRES && video_mode->yres == VMODE_YRES) { + video_mode->hbp = 40; + video_mode->hfp = 8; + video_mode->hsw = 96; + video_mode->vbp = 25; + video_mode->vfp = 2; + video_mode->vsw = 2; + /* + * The pixclock setting is not used within MCDE. The clock is + * setup elsewhere. But the pixclock value is visible in user + * space. + */ + video_mode->pixclock = (int) (1e+12 * (1.0 / PIX_CLK_FREQ)); + res = 0; + } /* TODO: add more supported resolutions here */ + video_mode->interlaced = false; + + if (res == 0) + print_vmode(video_mode); + else + dev_warn(&ddev->dev, + "%s:Failed to find video mode x=%d, y=%d\n", + __func__, video_mode->xres, video_mode->yres); + + return res; + +} + +static int set_video_mode( + struct mcde_display_device *ddev, struct mcde_video_mode *video_mode) +{ + int res; + DPI_DISP_TRACE; + + if (ddev == NULL || video_mode == NULL) { + dev_warn(&ddev->dev, "%s:ddev = NULL or video_mode = NULL\n", + __func__); + return -EINVAL; + } + if (video_mode->xres != VMODE_XRES || video_mode->yres != VMODE_YRES) { + dev_warn(&ddev->dev, "%s:Failed to set video mode x=%d, y=%d\n", + __func__, video_mode->xres, video_mode->yres); + return -EINVAL; + } + ddev->video_mode = *video_mode; + print_vmode(video_mode); + + res = mcde_chnl_set_video_mode(ddev->chnl_state, &ddev->video_mode); + if (res < 0) { + dev_warn(&ddev->dev, "%s:Failed to set video mode on channel\n", + __func__); + + } + /* notify mcde display driver about updated video mode */ + ddev->update_flags |= UPDATE_FLAG_VIDEO_MODE; + return res; +} + +static struct mcde_display_driver dpi_display_driver = { + .probe = dpi_display_probe, + .remove = dpi_display_remove, + .suspend = dpi_display_suspend, + .resume = dpi_display_resume, + .driver = { + .name = "mcde_display_dpi", + }, +}; + +/* Module init */ +static int __init mcde_dpi_display_init(void) +{ + pr_info("%s\n", __func__); + + return mcde_display_driver_register(&dpi_display_driver); +} +module_init(mcde_dpi_display_init); + +static void __exit mcde_dpi_display_exit(void) +{ + pr_info("%s\n", __func__); + + mcde_display_driver_unregister(&dpi_display_driver); +} +module_exit(mcde_dpi_display_exit); + +MODULE_AUTHOR("Marcel Tunnissen <marcel.tuennissen@stericsson.com>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ST-Ericsson MCDE DPI display driver fro VUIB500 display"); |