298 lines
6.5 KiB
C
298 lines
6.5 KiB
C
/*
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* Copyright (C) 2015 Heiko Schocher <hs@denx.de>
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*
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* from:
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* drivers/gpu/drm/panel/panel-ld9040.c
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* ld9040 AMOLED LCD drm_panel driver.
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd
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* Derived from drivers/video/backlight/ld9040.c
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*
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* Andrzej Hajda <a.hajda@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_panel.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <video/mipi_display.h>
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#include <video/of_videomode.h>
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#include <video/videomode.h>
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struct lg4573 {
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struct drm_panel panel;
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struct spi_device *spi;
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struct videomode vm;
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};
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static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel)
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{
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return container_of(panel, struct lg4573, panel);
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}
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static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data)
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{
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struct spi_transfer xfer = {
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.len = 2,
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};
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u16 temp = cpu_to_be16(data);
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struct spi_message msg;
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dev_dbg(ctx->panel.dev, "writing data: %x\n", data);
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xfer.tx_buf = &temp;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(ctx->spi, &msg);
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}
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static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer,
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unsigned int count)
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{
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unsigned int i;
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int ret;
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for (i = 0; i < count; i++) {
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ret = lg4573_spi_write_u16(ctx, buffer[i]);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs)
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{
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return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs));
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}
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static int lg4573_display_on(struct lg4573 *ctx)
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{
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int ret;
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ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
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if (ret)
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return ret;
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msleep(5);
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return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON);
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}
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static int lg4573_display_off(struct lg4573 *ctx)
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{
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int ret;
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ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF);
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if (ret)
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return ret;
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msleep(120);
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return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
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}
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static int lg4573_display_mode_settings(struct lg4573 *ctx)
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{
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static const u16 display_mode_settings[] = {
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0x703A, 0x7270, 0x70B1, 0x7208,
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0x723B, 0x720F, 0x70B2, 0x7200,
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0x72C8, 0x70B3, 0x7200, 0x70B4,
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0x7200, 0x70B5, 0x7242, 0x7210,
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0x7210, 0x7200, 0x7220, 0x70B6,
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0x720B, 0x720F, 0x723C, 0x7213,
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0x7213, 0x72E8, 0x70B7, 0x7246,
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0x7206, 0x720C, 0x7200, 0x7200,
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};
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dev_dbg(ctx->panel.dev, "transfer display mode settings\n");
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return lg4573_spi_write_u16_array(ctx, display_mode_settings,
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ARRAY_SIZE(display_mode_settings));
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}
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static int lg4573_power_settings(struct lg4573 *ctx)
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{
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static const u16 power_settings[] = {
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0x70C0, 0x7201, 0x7211, 0x70C3,
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0x7207, 0x7203, 0x7204, 0x7204,
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0x7204, 0x70C4, 0x7212, 0x7224,
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0x7218, 0x7218, 0x7202, 0x7249,
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0x70C5, 0x726F, 0x70C6, 0x7241,
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0x7263,
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};
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dev_dbg(ctx->panel.dev, "transfer power settings\n");
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return lg4573_spi_write_u16_array(ctx, power_settings,
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ARRAY_SIZE(power_settings));
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}
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static int lg4573_gamma_settings(struct lg4573 *ctx)
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{
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static const u16 gamma_settings[] = {
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0x70D0, 0x7203, 0x7207, 0x7273,
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0x7235, 0x7200, 0x7201, 0x7220,
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0x7200, 0x7203, 0x70D1, 0x7203,
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0x7207, 0x7273, 0x7235, 0x7200,
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0x7201, 0x7220, 0x7200, 0x7203,
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0x70D2, 0x7203, 0x7207, 0x7273,
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0x7235, 0x7200, 0x7201, 0x7220,
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0x7200, 0x7203, 0x70D3, 0x7203,
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0x7207, 0x7273, 0x7235, 0x7200,
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0x7201, 0x7220, 0x7200, 0x7203,
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0x70D4, 0x7203, 0x7207, 0x7273,
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0x7235, 0x7200, 0x7201, 0x7220,
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0x7200, 0x7203, 0x70D5, 0x7203,
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0x7207, 0x7273, 0x7235, 0x7200,
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0x7201, 0x7220, 0x7200, 0x7203,
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};
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dev_dbg(ctx->panel.dev, "transfer gamma settings\n");
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return lg4573_spi_write_u16_array(ctx, gamma_settings,
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ARRAY_SIZE(gamma_settings));
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}
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static int lg4573_init(struct lg4573 *ctx)
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{
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int ret;
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dev_dbg(ctx->panel.dev, "initializing LCD\n");
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ret = lg4573_display_mode_settings(ctx);
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if (ret)
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return ret;
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ret = lg4573_power_settings(ctx);
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if (ret)
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return ret;
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return lg4573_gamma_settings(ctx);
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}
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static int lg4573_power_on(struct lg4573 *ctx)
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{
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return lg4573_display_on(ctx);
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}
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static int lg4573_disable(struct drm_panel *panel)
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{
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struct lg4573 *ctx = panel_to_lg4573(panel);
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return lg4573_display_off(ctx);
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}
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static int lg4573_enable(struct drm_panel *panel)
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{
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struct lg4573 *ctx = panel_to_lg4573(panel);
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lg4573_init(ctx);
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return lg4573_power_on(ctx);
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}
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static const struct drm_display_mode default_mode = {
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.clock = 27000,
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.hdisplay = 480,
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.hsync_start = 480 + 10,
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.hsync_end = 480 + 10 + 59,
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.htotal = 480 + 10 + 59 + 10,
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.vdisplay = 800,
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.vsync_start = 800 + 15,
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.vsync_end = 800 + 15 + 15,
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.vtotal = 800 + 15 + 15 + 15,
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.vrefresh = 60,
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};
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static int lg4573_get_modes(struct drm_panel *panel)
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{
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struct drm_connector *connector = panel->connector;
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(panel->drm, &default_mode);
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if (!mode) {
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dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
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default_mode.hdisplay, default_mode.vdisplay,
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default_mode.vrefresh);
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return -ENOMEM;
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}
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drm_mode_set_name(mode);
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mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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panel->connector->display_info.width_mm = 61;
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panel->connector->display_info.height_mm = 103;
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return 1;
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}
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static const struct drm_panel_funcs lg4573_drm_funcs = {
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.disable = lg4573_disable,
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.enable = lg4573_enable,
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.get_modes = lg4573_get_modes,
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};
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static int lg4573_probe(struct spi_device *spi)
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{
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struct lg4573 *ctx;
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int ret;
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ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->spi = spi;
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spi_set_drvdata(spi, ctx);
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spi->bits_per_word = 8;
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ret = spi_setup(spi);
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if (ret < 0) {
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dev_err(&spi->dev, "SPI setup failed: %d\n", ret);
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return ret;
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}
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drm_panel_init(&ctx->panel);
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ctx->panel.dev = &spi->dev;
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ctx->panel.funcs = &lg4573_drm_funcs;
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return drm_panel_add(&ctx->panel);
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}
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static int lg4573_remove(struct spi_device *spi)
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{
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struct lg4573 *ctx = spi_get_drvdata(spi);
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lg4573_display_off(ctx);
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drm_panel_remove(&ctx->panel);
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return 0;
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}
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static const struct of_device_id lg4573_of_match[] = {
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{ .compatible = "lg,lg4573" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, lg4573_of_match);
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static struct spi_driver lg4573_driver = {
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.probe = lg4573_probe,
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.remove = lg4573_remove,
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.driver = {
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.name = "lg4573",
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.of_match_table = lg4573_of_match,
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},
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};
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module_spi_driver(lg4573_driver);
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MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
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MODULE_DESCRIPTION("lg4573 LCD Driver");
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MODULE_LICENSE("GPL v2");
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