diff options
Diffstat (limited to 'drivers/video/simple-panel.c')
| -rw-r--r-- | drivers/video/simple-panel.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/video/simple-panel.c b/drivers/video/simple-panel.c new file mode 100644 index 0000000000..dceedc60c3 --- /dev/null +++ b/drivers/video/simple-panel.c @@ -0,0 +1,160 @@ +/* + * simple panel support for barebox + * + * (C) Copyright 2014 Sascha Hauer, Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + */ +#include <common.h> +#include <malloc.h> +#include <init.h> +#include <linux/err.h> +#include <of.h> +#include <fb.h> +#include <gpio.h> +#include <of_gpio.h> +#include <video/backlight.h> +#include <video/vpl.h> +#include <i2c/i2c.h> + +struct simple_panel { + struct vpl vpl; + int enable_gpio; + int enable_active_high; + int enabled; + struct device_node *backlight_node; + struct backlight_device *backlight; + struct device_node *ddc_node; + int enable_delay; +}; + +static int simple_panel_enable(struct simple_panel *panel) +{ + int ret; + + if (panel->backlight_node && !panel->backlight) { + panel->backlight = of_backlight_find(panel->backlight_node); + if (!panel->backlight) + return -ENODEV; + } + + if (gpio_is_valid(panel->enable_gpio)) + gpio_direction_output(panel->enable_gpio, + panel->enable_active_high); + + if (panel->enable_delay) + mdelay(panel->enable_delay); + + if (panel->backlight) { + ret = backlight_set_brightness_default(panel->backlight); + if (ret) + return ret; + } + + return 0; +} + +static int simple_panel_disable(struct simple_panel *panel) +{ + if (panel->backlight) + backlight_set_brightness(panel->backlight, 0); + + if (gpio_is_valid(panel->enable_gpio)) + gpio_direction_output(panel->enable_gpio, + !panel->enable_active_high); + + return 0; +} + +static int simple_panel_get_modes(struct simple_panel *panel, struct display_timings *timings) +{ + int ret = -ENOENT; + + if (panel->ddc_node) { + struct i2c_adapter *i2c; + + i2c = of_find_i2c_adapter_by_node(panel->ddc_node); + if (!i2c) + return -ENODEV; + timings->edid = edid_read_i2c(i2c); + if (!timings->edid) + return -EINVAL; + + ret = edid_to_display_timings(timings, timings->edid); + } + + return ret; +} + +static int simple_panel_ioctl(struct vpl *vpl, unsigned int port, + unsigned int cmd, void *ptr) +{ + struct simple_panel *panel = container_of(vpl, + struct simple_panel, vpl); + + switch (cmd) { + case VPL_ENABLE: + return simple_panel_enable(panel); + case VPL_DISABLE: + return simple_panel_disable(panel); + case VPL_GET_VIDEOMODES: + return simple_panel_get_modes(panel, ptr); + default: + return -ENOSYS; + } +} + +static int simple_panel_probe(struct device_d *dev) +{ + struct simple_panel *panel; + struct device_node *node = dev->device_node; + enum of_gpio_flags flags; + int ret; + + panel = xzalloc(sizeof(*panel)); + + panel->enable_gpio = of_get_named_gpio_flags(node, "enable-gpios", 0, &flags); + panel->vpl.node = node; + panel->vpl.ioctl = simple_panel_ioctl; + + if (gpio_is_valid(panel->enable_gpio)) { + if (!(flags & OF_GPIO_ACTIVE_LOW)) + panel->enable_active_high = 1; + } + + panel->ddc_node = of_parse_phandle(node, "ddc-i2c-bus", 0); + + of_property_read_u32(node, "enable-delay", &panel->enable_delay); + + panel->backlight_node = of_parse_phandle(node, "backlight", 0); + + ret = vpl_register(&panel->vpl); + if (ret) + return ret; + + return 0; +} + +static struct of_device_id simple_panel_of_ids[] = { + { .compatible = "simple-panel", }, + { } +}; + +static struct driver_d simple_panel_driver = { + .name = "simple-panel", + .probe = simple_panel_probe, + .of_compatible = DRV_OF_COMPAT(simple_panel_of_ids), +}; +device_platform_driver(simple_panel_driver); |