390 lines
11 KiB
C
390 lines
11 KiB
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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/* Manufacturer Command Set */
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#define MCS_MANPWR 0xb0
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#define MCS_ELVSS_ON 0xb1
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#define MCS_USER_SETTING 0xf0
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#define MCS_DISPCTL 0xf2
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#define MCS_POWER_CTRL 0xf4
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#define MCS_GTCON 0xf7
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#define MCS_PANEL_CONDITION 0xf8
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#define MCS_GAMMA_SET1 0xf9
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#define MCS_GAMMA_CTRL 0xfb
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/* array of gamma tables for gamma value 2.2 */
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static u8 const ld9040_gammas[25][22] = {
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{ 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,
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0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },
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{ 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,
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0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },
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{ 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,
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0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },
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{ 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,
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0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },
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{ 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,
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0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },
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{ 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,
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0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },
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{ 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,
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0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },
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{ 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,
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0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },
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{ 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,
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0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },
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{ 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,
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0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },
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{ 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,
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0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },
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{ 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,
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0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },
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{ 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,
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0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },
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{ 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,
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0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },
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{ 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,
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0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },
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{ 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,
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0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },
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{ 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,
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0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },
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{ 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,
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0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },
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{ 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,
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0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },
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{ 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,
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0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },
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{ 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,
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0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },
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{ 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,
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0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },
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{ 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,
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0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },
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{ 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,
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0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },
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{ 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,
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0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },
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};
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struct ld9040 {
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struct device *dev;
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struct drm_panel panel;
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struct regulator_bulk_data supplies[2];
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struct gpio_desc *reset_gpio;
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u32 power_on_delay;
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u32 reset_delay;
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struct videomode vm;
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u32 width_mm;
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u32 height_mm;
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int brightness;
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/* This field is tested by functions directly accessing bus before
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* transfer, transfer is skipped if it is set. In case of transfer
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* failure or unexpected response the field is set to error value.
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* Such construct allows to eliminate many checks in higher level
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* functions.
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*/
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int error;
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};
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static inline struct ld9040 *panel_to_ld9040(struct drm_panel *panel)
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{
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return container_of(panel, struct ld9040, panel);
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}
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static int ld9040_clear_error(struct ld9040 *ctx)
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{
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int ret = ctx->error;
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ctx->error = 0;
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return ret;
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}
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static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)
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{
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struct spi_device *spi = to_spi_device(ctx->dev);
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struct spi_transfer xfer = {
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.len = 2,
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.tx_buf = &data,
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};
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struct spi_message msg;
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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(spi, &msg);
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}
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static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)
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{
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int ret = 0;
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if (ctx->error < 0 || len == 0)
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return;
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dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
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ret = ld9040_spi_write_word(ctx, *data);
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while (!ret && --len) {
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++data;
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ret = ld9040_spi_write_word(ctx, *data | 0x100);
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}
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if (ret) {
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dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
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(int)len, data);
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ctx->error = ret;
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}
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usleep_range(300, 310);
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}
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#define ld9040_dcs_write_seq_static(ctx, seq...) \
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({\
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static const u8 d[] = { seq };\
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ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\
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})
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static void ld9040_brightness_set(struct ld9040 *ctx)
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{
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ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],
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ARRAY_SIZE(ld9040_gammas[ctx->brightness]));
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ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);
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}
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static void ld9040_init(struct ld9040 *ctx)
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{
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ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);
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ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
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0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d,
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0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d,
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0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02);
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ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,
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0x02, 0x08, 0x08, 0x10, 0x10);
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ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);
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ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL,
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0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88);
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ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16);
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ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);
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ld9040_brightness_set(ctx);
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ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
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ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
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}
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static int ld9040_power_on(struct ld9040 *ctx)
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{
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int ret;
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ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
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if (ret < 0)
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return ret;
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msleep(ctx->power_on_delay);
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gpiod_set_value(ctx->reset_gpio, 0);
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msleep(ctx->reset_delay);
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gpiod_set_value(ctx->reset_gpio, 1);
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msleep(ctx->reset_delay);
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return 0;
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}
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static int ld9040_power_off(struct ld9040 *ctx)
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{
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return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
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}
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static int ld9040_disable(struct drm_panel *panel)
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{
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return 0;
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}
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static int ld9040_unprepare(struct drm_panel *panel)
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{
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struct ld9040 *ctx = panel_to_ld9040(panel);
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msleep(120);
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ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
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ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
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msleep(40);
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ld9040_clear_error(ctx);
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return ld9040_power_off(ctx);
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}
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static int ld9040_prepare(struct drm_panel *panel)
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{
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struct ld9040 *ctx = panel_to_ld9040(panel);
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int ret;
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ret = ld9040_power_on(ctx);
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if (ret < 0)
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return ret;
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ld9040_init(ctx);
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ret = ld9040_clear_error(ctx);
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if (ret < 0)
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ld9040_unprepare(panel);
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return ret;
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}
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static int ld9040_enable(struct drm_panel *panel)
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{
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return 0;
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}
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static int ld9040_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 ld9040 *ctx = panel_to_ld9040(panel);
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struct drm_display_mode *mode;
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mode = drm_mode_create(connector->dev);
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if (!mode) {
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DRM_ERROR("failed to create a new display mode\n");
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return 0;
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}
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drm_display_mode_from_videomode(&ctx->vm, mode);
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mode->width_mm = ctx->width_mm;
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mode->height_mm = ctx->height_mm;
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connector->display_info.width_mm = mode->width_mm;
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connector->display_info.height_mm = mode->height_mm;
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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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return 1;
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}
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static const struct drm_panel_funcs ld9040_drm_funcs = {
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.disable = ld9040_disable,
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.unprepare = ld9040_unprepare,
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.prepare = ld9040_prepare,
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.enable = ld9040_enable,
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.get_modes = ld9040_get_modes,
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};
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static int ld9040_parse_dt(struct ld9040 *ctx)
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{
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struct device *dev = ctx->dev;
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struct device_node *np = dev->of_node;
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int ret;
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ret = of_get_videomode(np, &ctx->vm, 0);
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if (ret < 0)
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return ret;
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of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
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of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
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of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
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of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
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return 0;
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}
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static int ld9040_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct ld9040 *ctx;
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int ret;
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ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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spi_set_drvdata(spi, ctx);
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ctx->dev = dev;
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ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;
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ret = ld9040_parse_dt(ctx);
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if (ret < 0)
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return ret;
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ctx->supplies[0].supply = "vdd3";
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ctx->supplies[1].supply = "vci";
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ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
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ctx->supplies);
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if (ret < 0)
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return ret;
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ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(ctx->reset_gpio)) {
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dev_err(dev, "cannot get reset-gpios %ld\n",
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PTR_ERR(ctx->reset_gpio));
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return PTR_ERR(ctx->reset_gpio);
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}
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spi->bits_per_word = 9;
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ret = spi_setup(spi);
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if (ret < 0) {
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dev_err(dev, "spi setup failed.\n");
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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 = dev;
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ctx->panel.funcs = &ld9040_drm_funcs;
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return drm_panel_add(&ctx->panel);
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}
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static int ld9040_remove(struct spi_device *spi)
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{
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struct ld9040 *ctx = spi_get_drvdata(spi);
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ld9040_power_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 ld9040_of_match[] = {
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{ .compatible = "samsung,ld9040" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ld9040_of_match);
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static struct spi_driver ld9040_driver = {
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.probe = ld9040_probe,
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.remove = ld9040_remove,
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.driver = {
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.name = "panel-samsung-ld9040",
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.owner = THIS_MODULE,
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.of_match_table = ld9040_of_match,
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},
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};
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module_spi_driver(ld9040_driver);
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MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
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MODULE_DESCRIPTION("ld9040 LCD Driver");
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MODULE_LICENSE("GPL v2");
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