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ef41af47e4
When possible use dev_err_probe help to properly deal with the PROBE_DEFER error, the benefit is that DEFER issue will be logged in the devices_deferred debugfs file. And using dev_err_probe() can reduce code size, the error value gets printed. Signed-off-by: Cai Huoqing <caihuoqing@baidu.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210916104612.11516-1-caihuoqing@baidu.com
224 lines
5.8 KiB
C
224 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Sharp LS037V7DW01 LCD Panel Driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated
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*
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* Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
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*
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* Copyright (C) 2013 Texas Instruments Incorporated
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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struct ls037v7dw01_panel {
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struct drm_panel panel;
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struct platform_device *pdev;
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struct regulator *vdd;
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struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
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struct gpio_desc *ini_gpio; /* high = power on */
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struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
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struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
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struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
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};
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#define to_ls037v7dw01_device(p) \
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container_of(p, struct ls037v7dw01_panel, panel)
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static int ls037v7dw01_disable(struct drm_panel *panel)
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{
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struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
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gpiod_set_value_cansleep(lcd->ini_gpio, 0);
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gpiod_set_value_cansleep(lcd->resb_gpio, 0);
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/* Wait at least 5 vsyncs after disabling the LCD. */
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msleep(100);
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return 0;
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}
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static int ls037v7dw01_unprepare(struct drm_panel *panel)
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{
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struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
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regulator_disable(lcd->vdd);
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return 0;
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}
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static int ls037v7dw01_prepare(struct drm_panel *panel)
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{
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struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
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int ret;
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ret = regulator_enable(lcd->vdd);
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if (ret < 0)
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dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
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__func__);
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return ret;
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}
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static int ls037v7dw01_enable(struct drm_panel *panel)
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{
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struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
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/* Wait couple of vsyncs before enabling the LCD. */
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msleep(50);
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gpiod_set_value_cansleep(lcd->resb_gpio, 1);
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gpiod_set_value_cansleep(lcd->ini_gpio, 1);
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return 0;
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}
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static const struct drm_display_mode ls037v7dw01_mode = {
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.clock = 19200,
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.hdisplay = 480,
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.hsync_start = 480 + 1,
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.hsync_end = 480 + 1 + 2,
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.htotal = 480 + 1 + 2 + 28,
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.vdisplay = 640,
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.vsync_start = 640 + 1,
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.vsync_end = 640 + 1 + 1,
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.vtotal = 640 + 1 + 1 + 1,
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.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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.width_mm = 56,
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.height_mm = 75,
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};
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static int ls037v7dw01_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
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if (!mode)
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return -ENOMEM;
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drm_mode_set_name(mode);
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drm_mode_probed_add(connector, mode);
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connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
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connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
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/*
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* FIXME: According to the datasheet pixel data is sampled on the
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* rising edge of the clock, but the code running on the SDP3430
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* indicates sampling on the negative edge. This should be tested on a
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* real device.
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*/
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connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
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| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
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| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
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return 1;
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}
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static const struct drm_panel_funcs ls037v7dw01_funcs = {
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.disable = ls037v7dw01_disable,
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.unprepare = ls037v7dw01_unprepare,
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.prepare = ls037v7dw01_prepare,
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.enable = ls037v7dw01_enable,
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.get_modes = ls037v7dw01_get_modes,
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};
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static int ls037v7dw01_probe(struct platform_device *pdev)
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{
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struct ls037v7dw01_panel *lcd;
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lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
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if (!lcd)
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return -ENOMEM;
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platform_set_drvdata(pdev, lcd);
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lcd->pdev = pdev;
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lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
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if (IS_ERR(lcd->vdd))
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return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd),
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"failed to get regulator\n");
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lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(lcd->ini_gpio))
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return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio),
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"failed to get enable gpio\n");
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lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(lcd->resb_gpio))
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return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio),
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"failed to get reset gpio\n");
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lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
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GPIOD_OUT_LOW);
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if (IS_ERR(lcd->mo_gpio)) {
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dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
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return PTR_ERR(lcd->mo_gpio);
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}
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lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
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GPIOD_OUT_LOW);
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if (IS_ERR(lcd->lr_gpio)) {
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dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
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return PTR_ERR(lcd->lr_gpio);
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}
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lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
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GPIOD_OUT_LOW);
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if (IS_ERR(lcd->ud_gpio)) {
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dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
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return PTR_ERR(lcd->ud_gpio);
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}
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drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
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DRM_MODE_CONNECTOR_DPI);
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drm_panel_add(&lcd->panel);
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return 0;
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}
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static int ls037v7dw01_remove(struct platform_device *pdev)
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{
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struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
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drm_panel_remove(&lcd->panel);
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drm_panel_disable(&lcd->panel);
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drm_panel_unprepare(&lcd->panel);
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return 0;
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}
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static const struct of_device_id ls037v7dw01_of_match[] = {
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{ .compatible = "sharp,ls037v7dw01", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
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static struct platform_driver ls037v7dw01_driver = {
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.probe = ls037v7dw01_probe,
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.remove = ls037v7dw01_remove,
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.driver = {
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.name = "panel-sharp-ls037v7dw01",
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.of_match_table = ls037v7dw01_of_match,
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},
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};
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module_platform_driver(ls037v7dw01_driver);
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MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
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MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
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MODULE_LICENSE("GPL");
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