diff options
Diffstat (limited to 'drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c new file mode 100644 index 000000000..a07d0f6c3 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sharp LS037V7DW01 LCD Panel Driver + * + * Copyright (C) 2019 Texas Instruments Incorporated + * + * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver + * + * Copyright (C) 2013 Texas Instruments Incorporated + * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> + +#include <drm/drm_connector.h> +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> + +struct ls037v7dw01_panel { + struct drm_panel panel; + struct platform_device *pdev; + + struct regulator *vdd; + struct gpio_desc *resb_gpio; /* low = reset active min 20 us */ + struct gpio_desc *ini_gpio; /* high = power on */ + struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */ + struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */ + struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */ +}; + +#define to_ls037v7dw01_device(p) \ + container_of(p, struct ls037v7dw01_panel, panel) + +static int ls037v7dw01_disable(struct drm_panel *panel) +{ + struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); + + gpiod_set_value_cansleep(lcd->ini_gpio, 0); + gpiod_set_value_cansleep(lcd->resb_gpio, 0); + + /* Wait at least 5 vsyncs after disabling the LCD. */ + msleep(100); + + return 0; +} + +static int ls037v7dw01_unprepare(struct drm_panel *panel) +{ + struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); + + regulator_disable(lcd->vdd); + return 0; +} + +static int ls037v7dw01_prepare(struct drm_panel *panel) +{ + struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); + int ret; + + ret = regulator_enable(lcd->vdd); + if (ret < 0) + dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n", + __func__); + + return ret; +} + +static int ls037v7dw01_enable(struct drm_panel *panel) +{ + struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); + + /* Wait couple of vsyncs before enabling the LCD. */ + msleep(50); + + gpiod_set_value_cansleep(lcd->resb_gpio, 1); + gpiod_set_value_cansleep(lcd->ini_gpio, 1); + + return 0; +} + +static const struct drm_display_mode ls037v7dw01_mode = { + .clock = 19200, + .hdisplay = 480, + .hsync_start = 480 + 1, + .hsync_end = 480 + 1 + 2, + .htotal = 480 + 1 + 2 + 28, + .vdisplay = 640, + .vsync_start = 640 + 1, + .vsync_end = 640 + 1 + 1, + .vtotal = 640 + 1 + 1 + 1, + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, + .width_mm = 56, + .height_mm = 75, +}; + +static int ls037v7dw01_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode); + if (!mode) + return -ENOMEM; + + drm_mode_set_name(mode); + drm_mode_probed_add(connector, mode); + + connector->display_info.width_mm = ls037v7dw01_mode.width_mm; + connector->display_info.height_mm = ls037v7dw01_mode.height_mm; + /* + * FIXME: According to the datasheet pixel data is sampled on the + * rising edge of the clock, but the code running on the SDP3430 + * indicates sampling on the negative edge. This should be tested on a + * real device. + */ + connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH + | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE + | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; + + return 1; +} + +static const struct drm_panel_funcs ls037v7dw01_funcs = { + .disable = ls037v7dw01_disable, + .unprepare = ls037v7dw01_unprepare, + .prepare = ls037v7dw01_prepare, + .enable = ls037v7dw01_enable, + .get_modes = ls037v7dw01_get_modes, +}; + +static int ls037v7dw01_probe(struct platform_device *pdev) +{ + struct ls037v7dw01_panel *lcd; + + lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL); + if (!lcd) + return -ENOMEM; + + platform_set_drvdata(pdev, lcd); + lcd->pdev = pdev; + + lcd->vdd = devm_regulator_get(&pdev->dev, "envdd"); + if (IS_ERR(lcd->vdd)) + return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd), + "failed to get regulator\n"); + + lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(lcd->ini_gpio)) + return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio), + "failed to get enable gpio\n"); + + lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(lcd->resb_gpio)) + return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio), + "failed to get reset gpio\n"); + + lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0, + GPIOD_OUT_LOW); + if (IS_ERR(lcd->mo_gpio)) { + dev_err(&pdev->dev, "failed to get mode[0] gpio\n"); + return PTR_ERR(lcd->mo_gpio); + } + + lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1, + GPIOD_OUT_LOW); + if (IS_ERR(lcd->lr_gpio)) { + dev_err(&pdev->dev, "failed to get mode[1] gpio\n"); + return PTR_ERR(lcd->lr_gpio); + } + + lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2, + GPIOD_OUT_LOW); + if (IS_ERR(lcd->ud_gpio)) { + dev_err(&pdev->dev, "failed to get mode[2] gpio\n"); + return PTR_ERR(lcd->ud_gpio); + } + + drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs, + DRM_MODE_CONNECTOR_DPI); + + drm_panel_add(&lcd->panel); + + return 0; +} + +static int ls037v7dw01_remove(struct platform_device *pdev) +{ + struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev); + + drm_panel_remove(&lcd->panel); + drm_panel_disable(&lcd->panel); + drm_panel_unprepare(&lcd->panel); + + return 0; +} + +static const struct of_device_id ls037v7dw01_of_match[] = { + { .compatible = "sharp,ls037v7dw01", }, + { /* sentinel */ }, +}; + +MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match); + +static struct platform_driver ls037v7dw01_driver = { + .probe = ls037v7dw01_probe, + .remove = ls037v7dw01_remove, + .driver = { + .name = "panel-sharp-ls037v7dw01", + .of_match_table = ls037v7dw01_of_match, + }, +}; + +module_platform_driver(ls037v7dw01_driver); + +MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); +MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); +MODULE_LICENSE("GPL"); |