448 lines
13 KiB
C
448 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Panel driver for the WideChips WS2401 480x800 DPI RGB panel, used in
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* the Samsung Mobile Display (SMD) LMS380KF01.
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* Found in the Samsung Galaxy Ace 2 GT-I8160 mobile phone.
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* Linus Walleij <linus.walleij@linaro.org>
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* Inspired by code and know-how in the vendor driver by Gareth Phillips.
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*/
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#include <drm/drm_mipi_dbi.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/media-bus-format.h>
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#include <linux/module.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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#define WS2401_RESCTL 0xb8 /* Resolution select control */
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#define WS2401_PSMPS 0xbd /* SMPS positive control */
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#define WS2401_NSMPS 0xbe /* SMPS negative control */
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#define WS2401_SMPS 0xbf
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#define WS2401_BCMODE 0xc1 /* Backlight control mode */
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#define WS2401_WRBLCTL 0xc3 /* Backlight control */
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#define WS2401_WRDISBV 0xc4 /* Write manual brightness */
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#define WS2401_WRCTRLD 0xc6 /* Write BL control */
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#define WS2401_WRMIE 0xc7 /* Write MIE mode */
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#define WS2401_READ_ID1 0xda /* Read panel ID 1 */
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#define WS2401_READ_ID2 0xdb /* Read panel ID 2 */
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#define WS2401_READ_ID3 0xdc /* Read panel ID 3 */
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#define WS2401_GAMMA_R1 0xe7 /* Gamma red 1 */
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#define WS2401_GAMMA_G1 0xe8 /* Gamma green 1 */
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#define WS2401_GAMMA_B1 0xe9 /* Gamma blue 1 */
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#define WS2401_GAMMA_R2 0xea /* Gamma red 2 */
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#define WS2401_GAMMA_G2 0xeb /* Gamma green 2 */
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#define WS2401_GAMMA_B2 0xec /* Gamma blue 2 */
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#define WS2401_PASSWD1 0xf0 /* Password command for level 2 */
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#define WS2401_DISCTL 0xf2 /* Display control */
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#define WS2401_PWRCTL 0xf3 /* Power control */
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#define WS2401_VCOMCTL 0xf4 /* VCOM control */
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#define WS2401_SRCCTL 0xf5 /* Source control */
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#define WS2401_PANELCTL 0xf6 /* Panel control */
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static const u8 ws2401_dbi_read_commands[] = {
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WS2401_READ_ID1,
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WS2401_READ_ID2,
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WS2401_READ_ID3,
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0, /* sentinel */
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};
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/**
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* struct ws2401 - state container for a panel controlled by the WS2401
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* controller
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*/
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struct ws2401 {
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/** @dev: the container device */
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struct device *dev;
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/** @dbi: the DBI bus abstraction handle */
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struct mipi_dbi dbi;
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/** @panel: the DRM panel instance for this device */
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struct drm_panel panel;
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/** @width: the width of this panel in mm */
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u32 width;
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/** @height: the height of this panel in mm */
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u32 height;
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/** @reset: reset GPIO line */
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struct gpio_desc *reset;
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/** @regulators: VCCIO and VIO supply regulators */
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struct regulator_bulk_data regulators[2];
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/** @internal_bl: If using internal backlight */
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bool internal_bl;
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};
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static const struct drm_display_mode lms380kf01_480_800_mode = {
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/*
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* The vendor driver states that the "SMD panel" has a clock
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* frequency of 49920000 Hz / 2 = 24960000 Hz.
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*/
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.clock = 24960,
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.hdisplay = 480,
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.hsync_start = 480 + 8,
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.hsync_end = 480 + 8 + 10,
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.htotal = 480 + 8 + 10 + 8,
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.vdisplay = 800,
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.vsync_start = 800 + 8,
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.vsync_end = 800 + 8 + 2,
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.vtotal = 800 + 8 + 2 + 18,
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.width_mm = 50,
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.height_mm = 84,
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.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
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};
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static inline struct ws2401 *to_ws2401(struct drm_panel *panel)
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{
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return container_of(panel, struct ws2401, panel);
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}
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static void ws2401_read_mtp_id(struct ws2401 *ws)
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{
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struct mipi_dbi *dbi = &ws->dbi;
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u8 id1, id2, id3;
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int ret;
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ret = mipi_dbi_command_read(dbi, WS2401_READ_ID1, &id1);
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if (ret) {
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dev_err(ws->dev, "unable to read MTP ID 1\n");
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return;
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}
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ret = mipi_dbi_command_read(dbi, WS2401_READ_ID2, &id2);
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if (ret) {
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dev_err(ws->dev, "unable to read MTP ID 2\n");
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return;
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}
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ret = mipi_dbi_command_read(dbi, WS2401_READ_ID3, &id3);
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if (ret) {
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dev_err(ws->dev, "unable to read MTP ID 3\n");
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return;
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}
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dev_info(ws->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);
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}
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static int ws2401_power_on(struct ws2401 *ws)
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{
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struct mipi_dbi *dbi = &ws->dbi;
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int ret;
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/* Power up */
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ret = regulator_bulk_enable(ARRAY_SIZE(ws->regulators),
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ws->regulators);
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if (ret) {
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dev_err(ws->dev, "failed to enable regulators: %d\n", ret);
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return ret;
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}
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msleep(10);
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/* Assert reset >=1 ms */
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gpiod_set_value_cansleep(ws->reset, 1);
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usleep_range(1000, 5000);
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/* De-assert reset */
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gpiod_set_value_cansleep(ws->reset, 0);
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/* Wait >= 10 ms */
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msleep(10);
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dev_dbg(ws->dev, "de-asserted RESET\n");
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/*
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* Exit sleep mode and initialize display - some hammering is
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* necessary.
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*/
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
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msleep(50);
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/* Magic to unlock level 2 control of the display */
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mipi_dbi_command(dbi, WS2401_PASSWD1, 0x5a, 0x5a);
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/* Configure resolution to 480RGBx800 */
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mipi_dbi_command(dbi, WS2401_RESCTL, 0x12);
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/* Set addressing mode Flip V(d0), Flip H(d1) RGB/BGR(d3) */
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x01);
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/* Set pixel format: 24 bpp */
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mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x70);
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mipi_dbi_command(dbi, WS2401_SMPS, 0x00, 0x0f);
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mipi_dbi_command(dbi, WS2401_PSMPS, 0x06, 0x03, /* DDVDH: 4.6v */
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0x7e, 0x03, 0x12, 0x37);
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mipi_dbi_command(dbi, WS2401_NSMPS, 0x06, 0x03, /* DDVDH: -4.6v */
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0x7e, 0x02, 0x15, 0x37);
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mipi_dbi_command(dbi, WS2401_SMPS, 0x02, 0x0f);
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mipi_dbi_command(dbi, WS2401_PWRCTL, 0x10, 0xA9, 0x00, 0x01, 0x44,
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0xb4, /* VGH:16.1v, VGL:-13.8v */
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0x50, /* GREFP:4.2v (default) */
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0x50, /* GREFN:-4.2v (default) */
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0x00,
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0x44); /* VOUTL:-10v (default) */
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mipi_dbi_command(dbi, WS2401_DISCTL, 0x01, 0x00, 0x00, 0x00, 0x14,
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0x16);
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mipi_dbi_command(dbi, WS2401_VCOMCTL, 0x30, 0x53, 0x53);
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mipi_dbi_command(dbi, WS2401_SRCCTL, 0x03, 0x0C, 0x00, 0x00, 0x00,
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0x01, /* 2 dot inversion */
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0x01, 0x06, 0x03);
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mipi_dbi_command(dbi, WS2401_PANELCTL, 0x14, 0x00, 0x80, 0x00);
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mipi_dbi_command(dbi, WS2401_WRMIE, 0x01);
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/* Set up gamma, probably these are P-gamma and N-gamma for each color */
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mipi_dbi_command(dbi, WS2401_GAMMA_R1, 0x00,
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0x5b, 0x42, 0x41, 0x3f, 0x42, 0x3d, 0x38, 0x2e,
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0x2b, 0x2a, 0x27, 0x22, 0x27, 0x0f, 0x00, 0x00);
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mipi_dbi_command(dbi, WS2401_GAMMA_R2, 0x00,
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0x5b, 0x42, 0x41, 0x3f, 0x42, 0x3d, 0x38, 0x2e,
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0x2b, 0x2a, 0x27, 0x22, 0x27, 0x0f, 0x00, 0x00);
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mipi_dbi_command(dbi, WS2401_GAMMA_G1, 0x00,
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0x59, 0x40, 0x3f, 0x3e, 0x41, 0x3d, 0x39, 0x2f,
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0x2c, 0x2b, 0x29, 0x25, 0x29, 0x19, 0x08, 0x00);
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mipi_dbi_command(dbi, WS2401_GAMMA_G2, 0x00,
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0x59, 0x40, 0x3f, 0x3e, 0x41, 0x3d, 0x39, 0x2f,
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0x2c, 0x2b, 0x29, 0x25, 0x29, 0x19, 0x08, 0x00);
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mipi_dbi_command(dbi, WS2401_GAMMA_B1, 0x00,
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0x57, 0x3b, 0x3a, 0x3b, 0x3f, 0x3b, 0x38, 0x27,
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0x38, 0x2a, 0x26, 0x22, 0x34, 0x0c, 0x09, 0x00);
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mipi_dbi_command(dbi, WS2401_GAMMA_B2, 0x00,
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0x57, 0x3b, 0x3a, 0x3b, 0x3f, 0x3b, 0x38, 0x27,
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0x38, 0x2a, 0x26, 0x22, 0x34, 0x0c, 0x09, 0x00);
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if (ws->internal_bl) {
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mipi_dbi_command(dbi, WS2401_WRCTRLD, 0x2c);
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} else {
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mipi_dbi_command(dbi, WS2401_WRCTRLD, 0x00);
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/*
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* When not using internal backlight we do not need any further
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* L2 accesses to the panel so we close the door on our way out.
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* Otherwise we need to leave the L2 door open.
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*/
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mipi_dbi_command(dbi, WS2401_PASSWD1, 0xa5, 0xa5);
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}
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return 0;
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}
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static int ws2401_power_off(struct ws2401 *ws)
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{
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/* Go into RESET and disable regulators */
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gpiod_set_value_cansleep(ws->reset, 1);
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return regulator_bulk_disable(ARRAY_SIZE(ws->regulators),
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ws->regulators);
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}
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static int ws2401_unprepare(struct drm_panel *panel)
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{
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struct ws2401 *ws = to_ws2401(panel);
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struct mipi_dbi *dbi = &ws->dbi;
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/* Make sure we disable backlight, if any */
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if (ws->internal_bl)
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mipi_dbi_command(dbi, WS2401_WRCTRLD, 0x00);
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mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
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msleep(120);
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return ws2401_power_off(to_ws2401(panel));
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}
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static int ws2401_disable(struct drm_panel *panel)
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{
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struct ws2401 *ws = to_ws2401(panel);
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struct mipi_dbi *dbi = &ws->dbi;
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
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msleep(25);
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return 0;
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}
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static int ws2401_prepare(struct drm_panel *panel)
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{
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return ws2401_power_on(to_ws2401(panel));
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}
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static int ws2401_enable(struct drm_panel *panel)
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{
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struct ws2401 *ws = to_ws2401(panel);
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struct mipi_dbi *dbi = &ws->dbi;
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
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return 0;
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}
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/**
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* ws2401_get_modes() - return the mode
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* @panel: the panel to get the mode for
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* @connector: reference to the central DRM connector control structure
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*/
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static int ws2401_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct ws2401 *ws = to_ws2401(panel);
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struct drm_display_mode *mode;
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static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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/*
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* We just support the LMS380KF01 so far, if we implement more panels
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* this mode, the following connector display_info settings and
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* probably the custom DCS sequences needs to selected based on what
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* the target panel needs.
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*/
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mode = drm_mode_duplicate(connector->dev, &lms380kf01_480_800_mode);
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if (!mode) {
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dev_err(ws->dev, "failed to add mode\n");
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return -ENOMEM;
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}
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connector->display_info.bpc = 8;
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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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connector->display_info.bus_flags =
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DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
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drm_display_info_set_bus_formats(&connector->display_info,
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&bus_format, 1);
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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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return 1;
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}
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static const struct drm_panel_funcs ws2401_drm_funcs = {
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.disable = ws2401_disable,
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.unprepare = ws2401_unprepare,
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.prepare = ws2401_prepare,
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.enable = ws2401_enable,
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||
|
|
.get_modes = ws2401_get_modes,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int ws2401_set_brightness(struct backlight_device *bl)
|
||
|
|
{
|
||
|
|
struct ws2401 *ws = bl_get_data(bl);
|
||
|
|
struct mipi_dbi *dbi = &ws->dbi;
|
||
|
|
u8 brightness = backlight_get_brightness(bl);
|
||
|
|
|
||
|
|
if (backlight_is_blank(bl)) {
|
||
|
|
mipi_dbi_command(dbi, WS2401_WRCTRLD, 0x00);
|
||
|
|
} else {
|
||
|
|
mipi_dbi_command(dbi, WS2401_WRCTRLD, 0x2c);
|
||
|
|
mipi_dbi_command(dbi, WS2401_WRDISBV, brightness);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct backlight_ops ws2401_bl_ops = {
|
||
|
|
.update_status = ws2401_set_brightness,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct backlight_properties ws2401_bl_props = {
|
||
|
|
.type = BACKLIGHT_PLATFORM,
|
||
|
|
.brightness = 120,
|
||
|
|
.max_brightness = U8_MAX,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int ws2401_probe(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct device *dev = &spi->dev;
|
||
|
|
struct ws2401 *ws;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ws = devm_kzalloc(dev, sizeof(*ws), GFP_KERNEL);
|
||
|
|
if (!ws)
|
||
|
|
return -ENOMEM;
|
||
|
|
ws->dev = dev;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* VCI is the analog voltage supply
|
||
|
|
* VCCIO is the digital I/O voltage supply
|
||
|
|
*/
|
||
|
|
ws->regulators[0].supply = "vci";
|
||
|
|
ws->regulators[1].supply = "vccio";
|
||
|
|
ret = devm_regulator_bulk_get(dev,
|
||
|
|
ARRAY_SIZE(ws->regulators),
|
||
|
|
ws->regulators);
|
||
|
|
if (ret)
|
||
|
|
return dev_err_probe(dev, ret, "failed to get regulators\n");
|
||
|
|
|
||
|
|
ws->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|
||
|
|
if (IS_ERR(ws->reset)) {
|
||
|
|
ret = PTR_ERR(ws->reset);
|
||
|
|
return dev_err_probe(dev, ret, "no RESET GPIO\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = mipi_dbi_spi_init(spi, &ws->dbi, NULL);
|
||
|
|
if (ret)
|
||
|
|
return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
|
||
|
|
ws->dbi.read_commands = ws2401_dbi_read_commands;
|
||
|
|
|
||
|
|
ws2401_power_on(ws);
|
||
|
|
ws2401_read_mtp_id(ws);
|
||
|
|
ws2401_power_off(ws);
|
||
|
|
|
||
|
|
drm_panel_init(&ws->panel, dev, &ws2401_drm_funcs,
|
||
|
|
DRM_MODE_CONNECTOR_DPI);
|
||
|
|
|
||
|
|
ret = drm_panel_of_backlight(&ws->panel);
|
||
|
|
if (ret)
|
||
|
|
return dev_err_probe(dev, ret,
|
||
|
|
"failed to get external backlight device\n");
|
||
|
|
|
||
|
|
if (!ws->panel.backlight) {
|
||
|
|
dev_dbg(dev, "no external backlight, using internal backlight\n");
|
||
|
|
ws->panel.backlight =
|
||
|
|
devm_backlight_device_register(dev, "ws2401", dev, ws,
|
||
|
|
&ws2401_bl_ops, &ws2401_bl_props);
|
||
|
|
if (IS_ERR(ws->panel.backlight))
|
||
|
|
return dev_err_probe(dev, PTR_ERR(ws->panel.backlight),
|
||
|
|
"failed to register backlight device\n");
|
||
|
|
} else {
|
||
|
|
dev_dbg(dev, "using external backlight\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
spi_set_drvdata(spi, ws);
|
||
|
|
|
||
|
|
drm_panel_add(&ws->panel);
|
||
|
|
dev_dbg(dev, "added panel\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ws2401_remove(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct ws2401 *ws = spi_get_drvdata(spi);
|
||
|
|
|
||
|
|
drm_panel_remove(&ws->panel);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Samsung LMS380KF01 is the one instance of this display controller that we
|
||
|
|
* know about, but if more are found, the controller can be parameterized
|
||
|
|
* here and used for other configurations.
|
||
|
|
*/
|
||
|
|
static const struct of_device_id ws2401_match[] = {
|
||
|
|
{ .compatible = "samsung,lms380kf01", },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, ws2401_match);
|
||
|
|
|
||
|
|
static const struct spi_device_id ws2401_ids[] = {
|
||
|
|
{ "lms380kf01" },
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(spi, ws2401_ids);
|
||
|
|
|
||
|
|
static struct spi_driver ws2401_driver = {
|
||
|
|
.probe = ws2401_probe,
|
||
|
|
.remove = ws2401_remove,
|
||
|
|
.id_table = ws2401_ids,
|
||
|
|
.driver = {
|
||
|
|
.name = "ws2401-panel",
|
||
|
|
.of_match_table = ws2401_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_spi_driver(ws2401_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
|
||
|
|
MODULE_DESCRIPTION("Samsung WS2401 panel driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|