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a0386bba70
The value returned by an spi driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com> Acked-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: Claudius Heine <ch@denx.de> Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com> Acked-by: Łukasz Stelmach <l.stelmach@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>
296 lines
6.4 KiB
C
296 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/delay.h>
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#include <linux/gpio/consumer.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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#include <video/of_videomode.h>
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#include <video/videomode.h>
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#include <drm/drm_device.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.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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__be16 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 = 28341,
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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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};
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static int lg4573_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(connector->dev, &default_mode);
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if (!mode) {
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dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
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default_mode.hdisplay, default_mode.vdisplay,
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drm_mode_vrefresh(&default_mode));
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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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connector->display_info.width_mm = 61;
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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, &spi->dev, &lg4573_drm_funcs,
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DRM_MODE_CONNECTOR_DPI);
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drm_panel_add(&ctx->panel);
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return 0;
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}
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static void 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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}
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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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