forked from mirrors/linux
3d5664f95e
Currently, ret is being checked for an error condition however it
is not being assigned in the previous statement on the call of
function mipi_dsi_dcs_exit_sleep_mode. Add in the missing assignment
of ret.
Detected by CoverityScan, CID#1470174, 1470178 ("Unchecked return value")
Fixes: 26aec25593 ("drm/panel: Add Ilitek ILI9881c panel driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180626160354.1363-1-colin.king@canonical.com
503 lines
13 KiB
C
503 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2017-2018, Bootlin
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/fb.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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#include <video/mipi_display.h>
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struct ili9881c {
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struct drm_panel panel;
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struct mipi_dsi_device *dsi;
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struct backlight_device *backlight;
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struct regulator *power;
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struct gpio_desc *reset;
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};
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enum ili9881c_op {
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ILI9881C_SWITCH_PAGE,
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ILI9881C_COMMAND,
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};
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struct ili9881c_instr {
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enum ili9881c_op op;
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union arg {
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struct cmd {
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u8 cmd;
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u8 data;
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} cmd;
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u8 page;
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} arg;
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};
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#define ILI9881C_SWITCH_PAGE_INSTR(_page) \
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{ \
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.op = ILI9881C_SWITCH_PAGE, \
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.arg = { \
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.page = (_page), \
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}, \
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}
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#define ILI9881C_COMMAND_INSTR(_cmd, _data) \
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{ \
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.op = ILI9881C_COMMAND, \
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.arg = { \
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.cmd = { \
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.cmd = (_cmd), \
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.data = (_data), \
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}, \
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}, \
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}
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static const struct ili9881c_instr ili9881c_init[] = {
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ILI9881C_SWITCH_PAGE_INSTR(3),
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ILI9881C_COMMAND_INSTR(0x01, 0x00),
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ILI9881C_COMMAND_INSTR(0x02, 0x00),
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ILI9881C_COMMAND_INSTR(0x03, 0x73),
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ILI9881C_COMMAND_INSTR(0x04, 0x03),
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ILI9881C_COMMAND_INSTR(0x05, 0x00),
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ILI9881C_COMMAND_INSTR(0x06, 0x06),
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ILI9881C_COMMAND_INSTR(0x07, 0x06),
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ILI9881C_COMMAND_INSTR(0x08, 0x00),
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ILI9881C_COMMAND_INSTR(0x09, 0x18),
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ILI9881C_COMMAND_INSTR(0x0a, 0x04),
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ILI9881C_COMMAND_INSTR(0x0b, 0x00),
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ILI9881C_COMMAND_INSTR(0x0c, 0x02),
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ILI9881C_COMMAND_INSTR(0x0d, 0x03),
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ILI9881C_COMMAND_INSTR(0x0e, 0x00),
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ILI9881C_COMMAND_INSTR(0x0f, 0x25),
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ILI9881C_COMMAND_INSTR(0x10, 0x25),
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ILI9881C_COMMAND_INSTR(0x11, 0x00),
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ILI9881C_COMMAND_INSTR(0x12, 0x00),
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ILI9881C_COMMAND_INSTR(0x13, 0x00),
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ILI9881C_COMMAND_INSTR(0x14, 0x00),
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ILI9881C_COMMAND_INSTR(0x15, 0x00),
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ILI9881C_COMMAND_INSTR(0x16, 0x0C),
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ILI9881C_COMMAND_INSTR(0x17, 0x00),
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ILI9881C_COMMAND_INSTR(0x18, 0x00),
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ILI9881C_COMMAND_INSTR(0x19, 0x00),
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ILI9881C_COMMAND_INSTR(0x1a, 0x00),
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ILI9881C_COMMAND_INSTR(0x1b, 0x00),
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ILI9881C_COMMAND_INSTR(0x1c, 0x00),
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ILI9881C_COMMAND_INSTR(0x1d, 0x00),
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ILI9881C_COMMAND_INSTR(0x1e, 0xC0),
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ILI9881C_COMMAND_INSTR(0x1f, 0x80),
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ILI9881C_COMMAND_INSTR(0x20, 0x04),
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ILI9881C_COMMAND_INSTR(0x21, 0x01),
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ILI9881C_COMMAND_INSTR(0x22, 0x00),
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ILI9881C_COMMAND_INSTR(0x23, 0x00),
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ILI9881C_COMMAND_INSTR(0x24, 0x00),
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ILI9881C_COMMAND_INSTR(0x25, 0x00),
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ILI9881C_COMMAND_INSTR(0x26, 0x00),
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ILI9881C_COMMAND_INSTR(0x27, 0x00),
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ILI9881C_COMMAND_INSTR(0x28, 0x33),
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ILI9881C_COMMAND_INSTR(0x29, 0x03),
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ILI9881C_COMMAND_INSTR(0x2a, 0x00),
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ILI9881C_COMMAND_INSTR(0x2b, 0x00),
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ILI9881C_COMMAND_INSTR(0x2c, 0x00),
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ILI9881C_COMMAND_INSTR(0x2d, 0x00),
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ILI9881C_COMMAND_INSTR(0x2e, 0x00),
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ILI9881C_COMMAND_INSTR(0x2f, 0x00),
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ILI9881C_COMMAND_INSTR(0x30, 0x00),
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ILI9881C_COMMAND_INSTR(0x31, 0x00),
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ILI9881C_COMMAND_INSTR(0x32, 0x00),
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ILI9881C_COMMAND_INSTR(0x33, 0x00),
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ILI9881C_COMMAND_INSTR(0x34, 0x04),
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ILI9881C_COMMAND_INSTR(0x35, 0x00),
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ILI9881C_COMMAND_INSTR(0x36, 0x00),
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ILI9881C_COMMAND_INSTR(0x37, 0x00),
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ILI9881C_COMMAND_INSTR(0x38, 0x3C),
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ILI9881C_COMMAND_INSTR(0x39, 0x00),
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ILI9881C_COMMAND_INSTR(0x3a, 0x00),
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ILI9881C_COMMAND_INSTR(0x3b, 0x00),
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ILI9881C_COMMAND_INSTR(0x3c, 0x00),
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ILI9881C_COMMAND_INSTR(0x3d, 0x00),
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ILI9881C_COMMAND_INSTR(0x3e, 0x00),
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ILI9881C_COMMAND_INSTR(0x3f, 0x00),
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ILI9881C_COMMAND_INSTR(0x40, 0x00),
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ILI9881C_COMMAND_INSTR(0x41, 0x00),
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ILI9881C_COMMAND_INSTR(0x42, 0x00),
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ILI9881C_COMMAND_INSTR(0x43, 0x00),
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ILI9881C_COMMAND_INSTR(0x44, 0x00),
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ILI9881C_COMMAND_INSTR(0x50, 0x01),
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ILI9881C_COMMAND_INSTR(0x51, 0x23),
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ILI9881C_COMMAND_INSTR(0x52, 0x45),
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ILI9881C_COMMAND_INSTR(0x53, 0x67),
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ILI9881C_COMMAND_INSTR(0x54, 0x89),
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ILI9881C_COMMAND_INSTR(0x55, 0xab),
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ILI9881C_COMMAND_INSTR(0x56, 0x01),
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ILI9881C_COMMAND_INSTR(0x57, 0x23),
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ILI9881C_COMMAND_INSTR(0x58, 0x45),
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ILI9881C_COMMAND_INSTR(0x59, 0x67),
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ILI9881C_COMMAND_INSTR(0x5a, 0x89),
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ILI9881C_COMMAND_INSTR(0x5b, 0xab),
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ILI9881C_COMMAND_INSTR(0x5c, 0xcd),
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ILI9881C_COMMAND_INSTR(0x5d, 0xef),
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ILI9881C_COMMAND_INSTR(0x5e, 0x11),
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ILI9881C_COMMAND_INSTR(0x5f, 0x02),
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ILI9881C_COMMAND_INSTR(0x60, 0x02),
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ILI9881C_COMMAND_INSTR(0x61, 0x02),
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ILI9881C_COMMAND_INSTR(0x62, 0x02),
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ILI9881C_COMMAND_INSTR(0x63, 0x02),
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ILI9881C_COMMAND_INSTR(0x64, 0x02),
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ILI9881C_COMMAND_INSTR(0x65, 0x02),
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ILI9881C_COMMAND_INSTR(0x66, 0x02),
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ILI9881C_COMMAND_INSTR(0x67, 0x02),
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ILI9881C_COMMAND_INSTR(0x68, 0x02),
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ILI9881C_COMMAND_INSTR(0x69, 0x02),
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ILI9881C_COMMAND_INSTR(0x6a, 0x0C),
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ILI9881C_COMMAND_INSTR(0x6b, 0x02),
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ILI9881C_COMMAND_INSTR(0x6c, 0x0F),
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ILI9881C_COMMAND_INSTR(0x6d, 0x0E),
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ILI9881C_COMMAND_INSTR(0x6e, 0x0D),
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ILI9881C_COMMAND_INSTR(0x6f, 0x06),
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ILI9881C_COMMAND_INSTR(0x70, 0x07),
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ILI9881C_COMMAND_INSTR(0x71, 0x02),
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ILI9881C_COMMAND_INSTR(0x72, 0x02),
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ILI9881C_COMMAND_INSTR(0x73, 0x02),
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ILI9881C_COMMAND_INSTR(0x74, 0x02),
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ILI9881C_COMMAND_INSTR(0x75, 0x02),
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ILI9881C_COMMAND_INSTR(0x76, 0x02),
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ILI9881C_COMMAND_INSTR(0x77, 0x02),
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ILI9881C_COMMAND_INSTR(0x78, 0x02),
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ILI9881C_COMMAND_INSTR(0x79, 0x02),
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ILI9881C_COMMAND_INSTR(0x7a, 0x02),
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ILI9881C_COMMAND_INSTR(0x7b, 0x02),
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ILI9881C_COMMAND_INSTR(0x7c, 0x02),
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ILI9881C_COMMAND_INSTR(0x7d, 0x02),
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ILI9881C_COMMAND_INSTR(0x7e, 0x02),
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ILI9881C_COMMAND_INSTR(0x7f, 0x02),
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ILI9881C_COMMAND_INSTR(0x80, 0x0C),
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ILI9881C_COMMAND_INSTR(0x81, 0x02),
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ILI9881C_COMMAND_INSTR(0x82, 0x0F),
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ILI9881C_COMMAND_INSTR(0x83, 0x0E),
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ILI9881C_COMMAND_INSTR(0x84, 0x0D),
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ILI9881C_COMMAND_INSTR(0x85, 0x06),
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ILI9881C_COMMAND_INSTR(0x86, 0x07),
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ILI9881C_COMMAND_INSTR(0x87, 0x02),
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ILI9881C_COMMAND_INSTR(0x88, 0x02),
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ILI9881C_COMMAND_INSTR(0x89, 0x02),
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ILI9881C_COMMAND_INSTR(0x8A, 0x02),
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ILI9881C_SWITCH_PAGE_INSTR(4),
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ILI9881C_COMMAND_INSTR(0x6C, 0x15),
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ILI9881C_COMMAND_INSTR(0x6E, 0x22),
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ILI9881C_COMMAND_INSTR(0x6F, 0x33),
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ILI9881C_COMMAND_INSTR(0x3A, 0xA4),
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ILI9881C_COMMAND_INSTR(0x8D, 0x0D),
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ILI9881C_COMMAND_INSTR(0x87, 0xBA),
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ILI9881C_COMMAND_INSTR(0x26, 0x76),
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ILI9881C_COMMAND_INSTR(0xB2, 0xD1),
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ILI9881C_SWITCH_PAGE_INSTR(1),
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ILI9881C_COMMAND_INSTR(0x22, 0x0A),
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ILI9881C_COMMAND_INSTR(0x53, 0xDC),
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ILI9881C_COMMAND_INSTR(0x55, 0xA7),
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ILI9881C_COMMAND_INSTR(0x50, 0x78),
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ILI9881C_COMMAND_INSTR(0x51, 0x78),
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ILI9881C_COMMAND_INSTR(0x31, 0x02),
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ILI9881C_COMMAND_INSTR(0x60, 0x14),
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ILI9881C_COMMAND_INSTR(0xA0, 0x2A),
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ILI9881C_COMMAND_INSTR(0xA1, 0x39),
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ILI9881C_COMMAND_INSTR(0xA2, 0x46),
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ILI9881C_COMMAND_INSTR(0xA3, 0x0e),
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ILI9881C_COMMAND_INSTR(0xA4, 0x12),
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ILI9881C_COMMAND_INSTR(0xA5, 0x25),
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ILI9881C_COMMAND_INSTR(0xA6, 0x19),
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ILI9881C_COMMAND_INSTR(0xA7, 0x1d),
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ILI9881C_COMMAND_INSTR(0xA8, 0xa6),
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ILI9881C_COMMAND_INSTR(0xA9, 0x1C),
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ILI9881C_COMMAND_INSTR(0xAA, 0x29),
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ILI9881C_COMMAND_INSTR(0xAB, 0x85),
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ILI9881C_COMMAND_INSTR(0xAC, 0x1C),
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ILI9881C_COMMAND_INSTR(0xAD, 0x1B),
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ILI9881C_COMMAND_INSTR(0xAE, 0x51),
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ILI9881C_COMMAND_INSTR(0xAF, 0x22),
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ILI9881C_COMMAND_INSTR(0xB0, 0x2d),
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ILI9881C_COMMAND_INSTR(0xB1, 0x4f),
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ILI9881C_COMMAND_INSTR(0xB2, 0x59),
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ILI9881C_COMMAND_INSTR(0xB3, 0x3F),
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ILI9881C_COMMAND_INSTR(0xC0, 0x2A),
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ILI9881C_COMMAND_INSTR(0xC1, 0x3a),
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ILI9881C_COMMAND_INSTR(0xC2, 0x45),
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ILI9881C_COMMAND_INSTR(0xC3, 0x0e),
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ILI9881C_COMMAND_INSTR(0xC4, 0x11),
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ILI9881C_COMMAND_INSTR(0xC5, 0x24),
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ILI9881C_COMMAND_INSTR(0xC6, 0x1a),
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ILI9881C_COMMAND_INSTR(0xC7, 0x1c),
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ILI9881C_COMMAND_INSTR(0xC8, 0xaa),
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ILI9881C_COMMAND_INSTR(0xC9, 0x1C),
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ILI9881C_COMMAND_INSTR(0xCA, 0x29),
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ILI9881C_COMMAND_INSTR(0xCB, 0x96),
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ILI9881C_COMMAND_INSTR(0xCC, 0x1C),
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ILI9881C_COMMAND_INSTR(0xCD, 0x1B),
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ILI9881C_COMMAND_INSTR(0xCE, 0x51),
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ILI9881C_COMMAND_INSTR(0xCF, 0x22),
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ILI9881C_COMMAND_INSTR(0xD0, 0x2b),
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ILI9881C_COMMAND_INSTR(0xD1, 0x4b),
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ILI9881C_COMMAND_INSTR(0xD2, 0x59),
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ILI9881C_COMMAND_INSTR(0xD3, 0x3F),
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};
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static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel)
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{
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return container_of(panel, struct ili9881c, panel);
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}
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/*
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* The panel seems to accept some private DCS commands that map
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* directly to registers.
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*
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* It is organised by page, with each page having its own set of
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* registers, and the first page looks like it's holding the standard
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* DCS commands.
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*
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* So before any attempt at sending a command or data, we have to be
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* sure if we're in the right page or not.
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*/
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static int ili9881c_switch_page(struct ili9881c *ctx, u8 page)
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{
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u8 buf[4] = { 0xff, 0x98, 0x81, page };
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int ret;
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ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data)
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{
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u8 buf[2] = { cmd, data };
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int ret;
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ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int ili9881c_prepare(struct drm_panel *panel)
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{
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struct ili9881c *ctx = panel_to_ili9881c(panel);
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unsigned int i;
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int ret;
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/* Power the panel */
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ret = regulator_enable(ctx->power);
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if (ret)
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return ret;
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msleep(5);
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/* And reset it */
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gpiod_set_value(ctx->reset, 1);
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msleep(20);
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gpiod_set_value(ctx->reset, 0);
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msleep(20);
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for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) {
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const struct ili9881c_instr *instr = &ili9881c_init[i];
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if (instr->op == ILI9881C_SWITCH_PAGE)
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ret = ili9881c_switch_page(ctx, instr->arg.page);
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else if (instr->op == ILI9881C_COMMAND)
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ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd,
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instr->arg.cmd.data);
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if (ret)
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return ret;
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}
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ret = ili9881c_switch_page(ctx, 0);
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if (ret)
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return ret;
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ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
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if (ret)
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return ret;
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ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
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if (ret)
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return ret;
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return 0;
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}
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static int ili9881c_enable(struct drm_panel *panel)
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{
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struct ili9881c *ctx = panel_to_ili9881c(panel);
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msleep(120);
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mipi_dsi_dcs_set_display_on(ctx->dsi);
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backlight_enable(ctx->backlight);
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return 0;
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}
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static int ili9881c_disable(struct drm_panel *panel)
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{
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struct ili9881c *ctx = panel_to_ili9881c(panel);
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backlight_disable(ctx->backlight);
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return mipi_dsi_dcs_set_display_off(ctx->dsi);
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}
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static int ili9881c_unprepare(struct drm_panel *panel)
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{
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struct ili9881c *ctx = panel_to_ili9881c(panel);
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mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
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regulator_disable(ctx->power);
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gpiod_set_value(ctx->reset, 1);
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|
return 0;
|
|
}
|
|
|
|
static const struct drm_display_mode bananapi_default_mode = {
|
|
.clock = 62000,
|
|
.vrefresh = 60,
|
|
|
|
.hdisplay = 720,
|
|
.hsync_start = 720 + 10,
|
|
.hsync_end = 720 + 10 + 20,
|
|
.htotal = 720 + 10 + 20 + 30,
|
|
|
|
.vdisplay = 1280,
|
|
.vsync_start = 1280 + 10,
|
|
.vsync_end = 1280 + 10 + 10,
|
|
.vtotal = 1280 + 10 + 10 + 20,
|
|
};
|
|
|
|
static int ili9881c_get_modes(struct drm_panel *panel)
|
|
{
|
|
struct drm_connector *connector = panel->connector;
|
|
struct ili9881c *ctx = panel_to_ili9881c(panel);
|
|
struct drm_display_mode *mode;
|
|
|
|
mode = drm_mode_duplicate(panel->drm, &bananapi_default_mode);
|
|
if (!mode) {
|
|
dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
|
|
bananapi_default_mode.hdisplay,
|
|
bananapi_default_mode.vdisplay,
|
|
bananapi_default_mode.vrefresh);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
drm_mode_set_name(mode);
|
|
|
|
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
|
|
drm_mode_probed_add(connector, mode);
|
|
|
|
panel->connector->display_info.width_mm = 62;
|
|
panel->connector->display_info.height_mm = 110;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static const struct drm_panel_funcs ili9881c_funcs = {
|
|
.prepare = ili9881c_prepare,
|
|
.unprepare = ili9881c_unprepare,
|
|
.enable = ili9881c_enable,
|
|
.disable = ili9881c_disable,
|
|
.get_modes = ili9881c_get_modes,
|
|
};
|
|
|
|
static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
|
|
{
|
|
struct device_node *np;
|
|
struct ili9881c *ctx;
|
|
int ret;
|
|
|
|
ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
mipi_dsi_set_drvdata(dsi, ctx);
|
|
ctx->dsi = dsi;
|
|
|
|
drm_panel_init(&ctx->panel);
|
|
ctx->panel.dev = &dsi->dev;
|
|
ctx->panel.funcs = &ili9881c_funcs;
|
|
|
|
ctx->power = devm_regulator_get(&dsi->dev, "power");
|
|
if (IS_ERR(ctx->power)) {
|
|
dev_err(&dsi->dev, "Couldn't get our power regulator\n");
|
|
return PTR_ERR(ctx->power);
|
|
}
|
|
|
|
ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ctx->reset)) {
|
|
dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
|
|
return PTR_ERR(ctx->reset);
|
|
}
|
|
|
|
np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
|
|
if (np) {
|
|
ctx->backlight = of_find_backlight_by_node(np);
|
|
of_node_put(np);
|
|
|
|
if (!ctx->backlight)
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
ret = drm_panel_add(&ctx->panel);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
|
|
dsi->format = MIPI_DSI_FMT_RGB888;
|
|
dsi->lanes = 4;
|
|
|
|
return mipi_dsi_attach(dsi);
|
|
}
|
|
|
|
static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi)
|
|
{
|
|
struct ili9881c *ctx = mipi_dsi_get_drvdata(dsi);
|
|
|
|
mipi_dsi_detach(dsi);
|
|
drm_panel_remove(&ctx->panel);
|
|
|
|
if (ctx->backlight)
|
|
put_device(&ctx->backlight->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ili9881c_of_match[] = {
|
|
{ .compatible = "bananapi,lhr050h41" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ili9881c_of_match);
|
|
|
|
static struct mipi_dsi_driver ili9881c_dsi_driver = {
|
|
.probe = ili9881c_dsi_probe,
|
|
.remove = ili9881c_dsi_remove,
|
|
.driver = {
|
|
.name = "ili9881c-dsi",
|
|
.of_match_table = ili9881c_of_match,
|
|
},
|
|
};
|
|
module_mipi_dsi_driver(ili9881c_dsi_driver);
|
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("Ilitek ILI9881C Controller Driver");
|
|
MODULE_LICENSE("GPL v2");
|