diff options
Diffstat (limited to 'drivers/gpu/drm/panel/panel-lg-lg4573.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-lg-lg4573.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-lg-lg4573.c b/drivers/gpu/drm/panel/panel-lg-lg4573.c new file mode 100644 index 0000000000..cf246d15b7 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-lg-lg4573.c @@ -0,0 +1,295 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015 Heiko Schocher <hs@denx.de> + * + * from: + * drivers/gpu/drm/panel/panel-ld9040.c + * ld9040 AMOLED LCD drm_panel driver. + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd + * Derived from drivers/video/backlight/ld9040.c + * + * Andrzej Hajda <a.hajda@samsung.com> +*/ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/regulator/consumer.h> +#include <linux/spi/spi.h> + +#include <video/mipi_display.h> +#include <video/of_videomode.h> +#include <video/videomode.h> + +#include <drm/drm_device.h> +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> + +struct lg4573 { + struct drm_panel panel; + struct spi_device *spi; + struct videomode vm; +}; + +static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel) +{ + return container_of(panel, struct lg4573, panel); +} + +static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data) +{ + struct spi_transfer xfer = { + .len = 2, + }; + __be16 temp = cpu_to_be16(data); + struct spi_message msg; + + dev_dbg(ctx->panel.dev, "writing data: %x\n", data); + xfer.tx_buf = &temp; + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + return spi_sync(ctx->spi, &msg); +} + +static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer, + unsigned int count) +{ + unsigned int i; + int ret; + + for (i = 0; i < count; i++) { + ret = lg4573_spi_write_u16(ctx, buffer[i]); + if (ret) + return ret; + } + + return 0; +} + +static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs) +{ + return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs)); +} + +static int lg4573_display_on(struct lg4573 *ctx) +{ + int ret; + + ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE); + if (ret) + return ret; + + msleep(5); + + return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON); +} + +static int lg4573_display_off(struct lg4573 *ctx) +{ + int ret; + + ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF); + if (ret) + return ret; + + msleep(120); + + return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE); +} + +static int lg4573_display_mode_settings(struct lg4573 *ctx) +{ + static const u16 display_mode_settings[] = { + 0x703A, 0x7270, 0x70B1, 0x7208, + 0x723B, 0x720F, 0x70B2, 0x7200, + 0x72C8, 0x70B3, 0x7200, 0x70B4, + 0x7200, 0x70B5, 0x7242, 0x7210, + 0x7210, 0x7200, 0x7220, 0x70B6, + 0x720B, 0x720F, 0x723C, 0x7213, + 0x7213, 0x72E8, 0x70B7, 0x7246, + 0x7206, 0x720C, 0x7200, 0x7200, + }; + + dev_dbg(ctx->panel.dev, "transfer display mode settings\n"); + return lg4573_spi_write_u16_array(ctx, display_mode_settings, + ARRAY_SIZE(display_mode_settings)); +} + +static int lg4573_power_settings(struct lg4573 *ctx) +{ + static const u16 power_settings[] = { + 0x70C0, 0x7201, 0x7211, 0x70C3, + 0x7207, 0x7203, 0x7204, 0x7204, + 0x7204, 0x70C4, 0x7212, 0x7224, + 0x7218, 0x7218, 0x7202, 0x7249, + 0x70C5, 0x726F, 0x70C6, 0x7241, + 0x7263, + }; + + dev_dbg(ctx->panel.dev, "transfer power settings\n"); + return lg4573_spi_write_u16_array(ctx, power_settings, + ARRAY_SIZE(power_settings)); +} + +static int lg4573_gamma_settings(struct lg4573 *ctx) +{ + static const u16 gamma_settings[] = { + 0x70D0, 0x7203, 0x7207, 0x7273, + 0x7235, 0x7200, 0x7201, 0x7220, + 0x7200, 0x7203, 0x70D1, 0x7203, + 0x7207, 0x7273, 0x7235, 0x7200, + 0x7201, 0x7220, 0x7200, 0x7203, + 0x70D2, 0x7203, 0x7207, 0x7273, + 0x7235, 0x7200, 0x7201, 0x7220, + 0x7200, 0x7203, 0x70D3, 0x7203, + 0x7207, 0x7273, 0x7235, 0x7200, + 0x7201, 0x7220, 0x7200, 0x7203, + 0x70D4, 0x7203, 0x7207, 0x7273, + 0x7235, 0x7200, 0x7201, 0x7220, + 0x7200, 0x7203, 0x70D5, 0x7203, + 0x7207, 0x7273, 0x7235, 0x7200, + 0x7201, 0x7220, 0x7200, 0x7203, + }; + + dev_dbg(ctx->panel.dev, "transfer gamma settings\n"); + return lg4573_spi_write_u16_array(ctx, gamma_settings, + ARRAY_SIZE(gamma_settings)); +} + +static int lg4573_init(struct lg4573 *ctx) +{ + int ret; + + dev_dbg(ctx->panel.dev, "initializing LCD\n"); + + ret = lg4573_display_mode_settings(ctx); + if (ret) + return ret; + + ret = lg4573_power_settings(ctx); + if (ret) + return ret; + + return lg4573_gamma_settings(ctx); +} + +static int lg4573_power_on(struct lg4573 *ctx) +{ + return lg4573_display_on(ctx); +} + +static int lg4573_disable(struct drm_panel *panel) +{ + struct lg4573 *ctx = panel_to_lg4573(panel); + + return lg4573_display_off(ctx); +} + +static int lg4573_enable(struct drm_panel *panel) +{ + struct lg4573 *ctx = panel_to_lg4573(panel); + + lg4573_init(ctx); + + return lg4573_power_on(ctx); +} + +static const struct drm_display_mode default_mode = { + .clock = 28341, + .hdisplay = 480, + .hsync_start = 480 + 10, + .hsync_end = 480 + 10 + 59, + .htotal = 480 + 10 + 59 + 10, + .vdisplay = 800, + .vsync_start = 800 + 15, + .vsync_end = 800 + 15 + 15, + .vtotal = 800 + 15 + 15 + 15, +}; + +static int lg4573_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(connector->dev, &default_mode); + if (!mode) { + dev_err(panel->dev, "failed to add mode %ux%ux@%u\n", + default_mode.hdisplay, default_mode.vdisplay, + drm_mode_vrefresh(&default_mode)); + return -ENOMEM; + } + + drm_mode_set_name(mode); + + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(connector, mode); + + connector->display_info.width_mm = 61; + connector->display_info.height_mm = 103; + + return 1; +} + +static const struct drm_panel_funcs lg4573_drm_funcs = { + .disable = lg4573_disable, + .enable = lg4573_enable, + .get_modes = lg4573_get_modes, +}; + +static int lg4573_probe(struct spi_device *spi) +{ + struct lg4573 *ctx; + int ret; + + ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->spi = spi; + + spi_set_drvdata(spi, ctx); + spi->bits_per_word = 8; + + ret = spi_setup(spi); + if (ret < 0) { + dev_err(&spi->dev, "SPI setup failed: %d\n", ret); + return ret; + } + + drm_panel_init(&ctx->panel, &spi->dev, &lg4573_drm_funcs, + DRM_MODE_CONNECTOR_DPI); + + drm_panel_add(&ctx->panel); + + return 0; +} + +static void lg4573_remove(struct spi_device *spi) +{ + struct lg4573 *ctx = spi_get_drvdata(spi); + + lg4573_display_off(ctx); + drm_panel_remove(&ctx->panel); +} + +static const struct of_device_id lg4573_of_match[] = { + { .compatible = "lg,lg4573" }, + { } +}; +MODULE_DEVICE_TABLE(of, lg4573_of_match); + +static struct spi_driver lg4573_driver = { + .probe = lg4573_probe, + .remove = lg4573_remove, + .driver = { + .name = "lg4573", + .of_match_table = lg4573_of_match, + }, +}; +module_spi_driver(lg4573_driver); + +MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); +MODULE_DESCRIPTION("lg4573 LCD Driver"); +MODULE_LICENSE("GPL v2"); |