343 lines
7.6 KiB
C
343 lines
7.6 KiB
C
/*
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* LCD panel driver for Sharp LS037V7DW01
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*
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* Copyright (C) 2013 Texas Instruments
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/regulator/consumer.h>
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#include <video/omapfb_dss.h>
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struct panel_drv_data {
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struct omap_dss_device dssdev;
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struct omap_dss_device *in;
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struct regulator *vcc;
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int data_lines;
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struct omap_video_timings videomode;
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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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static const struct omap_video_timings sharp_ls_timings = {
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.x_res = 480,
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.y_res = 640,
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.pixelclock = 19200000,
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.hsw = 2,
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.hfp = 1,
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.hbp = 28,
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.vsw = 1,
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.vfp = 1,
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.vbp = 1,
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.vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
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.hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
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.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
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.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
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.sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
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};
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#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
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static int sharp_ls_connect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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if (omapdss_device_is_connected(dssdev))
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return 0;
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r = in->ops.dpi->connect(in, dssdev);
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if (r)
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return r;
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return 0;
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}
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static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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if (!omapdss_device_is_connected(dssdev))
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return;
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in->ops.dpi->disconnect(in, dssdev);
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}
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static int sharp_ls_enable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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if (!omapdss_device_is_connected(dssdev))
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return -ENODEV;
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if (omapdss_device_is_enabled(dssdev))
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return 0;
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if (ddata->data_lines)
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in->ops.dpi->set_data_lines(in, ddata->data_lines);
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in->ops.dpi->set_timings(in, &ddata->videomode);
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if (ddata->vcc) {
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r = regulator_enable(ddata->vcc);
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if (r != 0)
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return r;
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}
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r = in->ops.dpi->enable(in);
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if (r) {
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regulator_disable(ddata->vcc);
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return r;
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}
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/* wait couple of vsyncs until enabling the LCD */
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msleep(50);
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if (ddata->resb_gpio)
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gpiod_set_value_cansleep(ddata->resb_gpio, 1);
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if (ddata->ini_gpio)
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gpiod_set_value_cansleep(ddata->ini_gpio, 1);
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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return 0;
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}
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static void sharp_ls_disable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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if (!omapdss_device_is_enabled(dssdev))
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return;
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if (ddata->ini_gpio)
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gpiod_set_value_cansleep(ddata->ini_gpio, 0);
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if (ddata->resb_gpio)
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gpiod_set_value_cansleep(ddata->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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in->ops.dpi->disable(in);
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if (ddata->vcc)
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regulator_disable(ddata->vcc);
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dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
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}
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static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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ddata->videomode = *timings;
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dssdev->panel.timings = *timings;
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in->ops.dpi->set_timings(in, timings);
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}
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static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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*timings = ddata->videomode;
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}
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static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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return in->ops.dpi->check_timings(in, timings);
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}
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static struct omap_dss_driver sharp_ls_ops = {
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.connect = sharp_ls_connect,
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.disconnect = sharp_ls_disconnect,
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.enable = sharp_ls_enable,
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.disable = sharp_ls_disable,
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.set_timings = sharp_ls_set_timings,
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.get_timings = sharp_ls_get_timings,
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.check_timings = sharp_ls_check_timings,
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.get_resolution = omapdss_default_get_resolution,
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};
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static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
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const char *desc, struct gpio_desc **gpiod)
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{
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struct gpio_desc *gd;
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*gpiod = NULL;
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gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
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if (IS_ERR(gd))
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return PTR_ERR(gd);
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*gpiod = gd;
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return 0;
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}
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static int sharp_ls_probe_of(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct device_node *node = pdev->dev.of_node;
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struct omap_dss_device *in;
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int r;
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ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
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if (IS_ERR(ddata->vcc)) {
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dev_err(&pdev->dev, "failed to get regulator\n");
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return PTR_ERR(ddata->vcc);
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}
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/* lcd INI */
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r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
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if (r)
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return r;
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/* lcd RESB */
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r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
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if (r)
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return r;
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/* lcd MO */
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r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
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if (r)
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return r;
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/* lcd LR */
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r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
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if (r)
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return r;
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/* lcd UD */
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r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
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if (r)
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return r;
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in = omapdss_of_find_source_for_first_ep(node);
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if (IS_ERR(in)) {
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dev_err(&pdev->dev, "failed to find video source\n");
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return PTR_ERR(in);
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}
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ddata->in = in;
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return 0;
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}
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static int sharp_ls_probe(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata;
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struct omap_dss_device *dssdev;
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int r;
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if (!pdev->dev.of_node)
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return -ENODEV;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (ddata == NULL)
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return -ENOMEM;
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platform_set_drvdata(pdev, ddata);
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r = sharp_ls_probe_of(pdev);
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if (r)
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return r;
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ddata->videomode = sharp_ls_timings;
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dssdev = &ddata->dssdev;
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dssdev->dev = &pdev->dev;
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dssdev->driver = &sharp_ls_ops;
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dssdev->type = OMAP_DISPLAY_TYPE_DPI;
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dssdev->owner = THIS_MODULE;
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dssdev->panel.timings = ddata->videomode;
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dssdev->phy.dpi.data_lines = ddata->data_lines;
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r = omapdss_register_display(dssdev);
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if (r) {
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dev_err(&pdev->dev, "Failed to register panel\n");
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goto err_reg;
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}
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return 0;
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err_reg:
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omap_dss_put_device(ddata->in);
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return r;
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}
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static int __exit sharp_ls_remove(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct omap_dss_device *dssdev = &ddata->dssdev;
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struct omap_dss_device *in = ddata->in;
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omapdss_unregister_display(dssdev);
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sharp_ls_disable(dssdev);
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sharp_ls_disconnect(dssdev);
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omap_dss_put_device(in);
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return 0;
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}
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static const struct of_device_id sharp_ls_of_match[] = {
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{ .compatible = "omapdss,sharp,ls037v7dw01", },
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{},
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};
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MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
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static struct platform_driver sharp_ls_driver = {
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.probe = sharp_ls_probe,
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.remove = __exit_p(sharp_ls_remove),
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.driver = {
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.name = "panel-sharp-ls037v7dw01",
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.of_match_table = sharp_ls_of_match,
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.suppress_bind_attrs = true,
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},
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};
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module_platform_driver(sharp_ls_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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