^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * LCD-OLinuXino support for panel driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2018 Olimex Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Stefan Mavrodiev <stefan@olimex.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <video/videomode.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <video/display_timing.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <drm/drm_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <drm/drm_modes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <drm/drm_panel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define LCD_OLINUXINO_HEADER_MAGIC 0x4F4CB727
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define LCD_OLINUXINO_DATA_LEN 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct lcd_olinuxino_mode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) u32 pixelclock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) u32 hactive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) u32 hfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) u32 hbp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u32 hpw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u32 vactive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u32 vfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u32 vbp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u32 vpw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) u32 refresh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u32 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct lcd_olinuxino_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) char name[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) u32 width_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) u32 height_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) u32 bpc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u32 bus_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) u32 bus_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) } __attribute__((__packed__));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct lcd_olinuxino_eeprom {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) u32 header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) u32 id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) char revision[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) u32 serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct lcd_olinuxino_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u32 num_modes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u8 reserved[180];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 checksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) } __attribute__((__packed__));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct lcd_olinuxino {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct drm_panel panel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bool prepared;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) bool enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct regulator *supply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct gpio_desc *enable_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct lcd_olinuxino_eeprom eeprom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static inline struct lcd_olinuxino *to_lcd_olinuxino(struct drm_panel *panel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return container_of(panel, struct lcd_olinuxino, panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int lcd_olinuxino_disable(struct drm_panel *panel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!lcd->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) lcd->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static int lcd_olinuxino_unprepare(struct drm_panel *panel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!lcd->prepared)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) gpiod_set_value_cansleep(lcd->enable_gpio, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) regulator_disable(lcd->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) lcd->prepared = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int lcd_olinuxino_prepare(struct drm_panel *panel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (lcd->prepared)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = regulator_enable(lcd->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) gpiod_set_value_cansleep(lcd->enable_gpio, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) lcd->prepared = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int lcd_olinuxino_enable(struct drm_panel *panel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (lcd->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) lcd->enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int lcd_olinuxino_get_modes(struct drm_panel *panel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct drm_connector *connector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct lcd_olinuxino_info *lcd_info = &lcd->eeprom.info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct lcd_olinuxino_mode *lcd_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct drm_display_mode *mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) u32 i, num = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) for (i = 0; i < lcd->eeprom.num_modes; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) lcd_mode = (struct lcd_olinuxino_mode *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) &lcd->eeprom.reserved[i * sizeof(*lcd_mode)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) mode = drm_mode_create(connector->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (!mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) lcd_mode->hactive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) lcd_mode->vactive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) lcd_mode->refresh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) mode->clock = lcd_mode->pixelclock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mode->hdisplay = lcd_mode->hactive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) mode->hsync_start = lcd_mode->hactive + lcd_mode->hfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) mode->hsync_end = lcd_mode->hactive + lcd_mode->hfp +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) lcd_mode->hpw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) mode->htotal = lcd_mode->hactive + lcd_mode->hfp +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) lcd_mode->hpw + lcd_mode->hbp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) mode->vdisplay = lcd_mode->vactive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) mode->vsync_start = lcd_mode->vactive + lcd_mode->vfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) mode->vsync_end = lcd_mode->vactive + lcd_mode->vfp +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) lcd_mode->vpw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) mode->vtotal = lcd_mode->vactive + lcd_mode->vfp +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) lcd_mode->vpw + lcd_mode->vbp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Always make the first mode preferred */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (i == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) mode->type |= DRM_MODE_TYPE_PREFERRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) mode->type |= DRM_MODE_TYPE_DRIVER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) drm_mode_set_name(mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) drm_mode_probed_add(connector, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) num++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) connector->display_info.width_mm = lcd_info->width_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) connector->display_info.height_mm = lcd_info->height_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) connector->display_info.bpc = lcd_info->bpc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (lcd_info->bus_format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) drm_display_info_set_bus_formats(&connector->display_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) &lcd_info->bus_format, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) connector->display_info.bus_flags = lcd_info->bus_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static const struct drm_panel_funcs lcd_olinuxino_funcs = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) .disable = lcd_olinuxino_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .unprepare = lcd_olinuxino_unprepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) .prepare = lcd_olinuxino_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .enable = lcd_olinuxino_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) .get_modes = lcd_olinuxino_get_modes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int lcd_olinuxino_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct lcd_olinuxino *lcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) u32 checksum, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) I2C_FUNC_SMBUS_READ_I2C_BLOCK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) lcd = devm_kzalloc(dev, sizeof(*lcd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (!lcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) i2c_set_clientdata(client, lcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) lcd->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) lcd->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mutex_init(&lcd->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* Copy data into buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) for (i = 0; i < LCD_OLINUXINO_DATA_LEN; i += I2C_SMBUS_BLOCK_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) mutex_lock(&lcd->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ret = i2c_smbus_read_i2c_block_data(client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) I2C_SMBUS_BLOCK_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) (u8 *)&lcd->eeprom + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) mutex_unlock(&lcd->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) dev_err(dev, "error reading from device at %02x\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /* Check configuration checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) checksum = ~crc32(~0, (u8 *)&lcd->eeprom, 252);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (checksum != lcd->eeprom.checksum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) dev_err(dev, "configuration checksum does not match!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /* Check magic header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (lcd->eeprom.header != LCD_OLINUXINO_HEADER_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) dev_err(dev, "magic header does not match\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) dev_info(dev, "Detected %s, Rev. %s, Serial: %08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) lcd->eeprom.info.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) lcd->eeprom.revision,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) lcd->eeprom.serial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * The eeprom can hold up to 4 modes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * If the stored value is bigger, overwrite it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (lcd->eeprom.num_modes > 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) dev_warn(dev, "invalid number of modes, falling back to 4\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) lcd->eeprom.num_modes = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) lcd->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) lcd->prepared = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) lcd->supply = devm_regulator_get(dev, "power");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (IS_ERR(lcd->supply))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return PTR_ERR(lcd->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) lcd->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (IS_ERR(lcd->enable_gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return PTR_ERR(lcd->enable_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) drm_panel_init(&lcd->panel, dev, &lcd_olinuxino_funcs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) DRM_MODE_CONNECTOR_DPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) ret = drm_panel_of_backlight(&lcd->panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) drm_panel_add(&lcd->panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int lcd_olinuxino_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct lcd_olinuxino *panel = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) drm_panel_remove(&panel->panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) drm_panel_disable(&panel->panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) drm_panel_unprepare(&panel->panel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static const struct of_device_id lcd_olinuxino_of_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) { .compatible = "olimex,lcd-olinuxino" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) MODULE_DEVICE_TABLE(of, lcd_olinuxino_of_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static struct i2c_driver lcd_olinuxino_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) .name = "lcd_olinuxino",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) .of_match_table = lcd_olinuxino_of_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) .probe = lcd_olinuxino_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) .remove = lcd_olinuxino_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) module_i2c_driver(lcd_olinuxino_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) MODULE_AUTHOR("Stefan Mavrodiev <stefan@olimex.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) MODULE_DESCRIPTION("LCD-OLinuXino driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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