// SPDX-License-Identifier: GPL-2.0+ /* * Toppoly TD043MTEA1 Panel Driver * * Copyright (C) 2019 Texas Instruments Incorporated * * Based on the omapdrm-specific panel-tpo-td043mtea1 driver * * Author: Gražvydas Ignotas */ #include #include #include #include #include #include #include #define TPO_R02_MODE(x) ((x) & 7) #define TPO_R02_MODE_800x480 7 #define TPO_R02_NCLK_RISING BIT(3) #define TPO_R02_HSYNC_HIGH BIT(4) #define TPO_R02_VSYNC_HIGH BIT(5) #define TPO_R03_NSTANDBY BIT(0) #define TPO_R03_EN_CP_CLK BIT(1) #define TPO_R03_EN_VGL_PUMP BIT(2) #define TPO_R03_EN_PWM BIT(3) #define TPO_R03_DRIVING_CAP_100 BIT(4) #define TPO_R03_EN_PRE_CHARGE BIT(6) #define TPO_R03_SOFTWARE_CTL BIT(7) #define TPO_R04_NFLIP_H BIT(0) #define TPO_R04_NFLIP_V BIT(1) #define TPO_R04_CP_CLK_FREQ_1H BIT(2) #define TPO_R04_VGL_FREQ_1H BIT(4) #define TPO_R03_VAL_NORMAL \ (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | TPO_R03_EN_VGL_PUMP | \ TPO_R03_EN_PWM | TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \ TPO_R03_SOFTWARE_CTL) #define TPO_R03_VAL_STANDBY \ (TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \ TPO_R03_SOFTWARE_CTL) static const u16 td043mtea1_def_gamma[12] = { 105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023 }; struct td043mtea1_panel { struct drm_panel panel; struct spi_device *spi; struct regulator *vcc_reg; struct gpio_desc *reset_gpio; unsigned int mode; u16 gamma[12]; bool vmirror; bool powered_on; bool spi_suspended; bool power_on_resume; }; #define to_td043mtea1_device(p) container_of(p, struct td043mtea1_panel, panel) /* ----------------------------------------------------------------------------- * Hardware Access */ static int td043mtea1_write(struct td043mtea1_panel *lcd, u8 addr, u8 value) { struct spi_message msg; struct spi_transfer xfer; u16 data; int ret; spi_message_init(&msg); memset(&xfer, 0, sizeof(xfer)); data = ((u16)addr << 10) | (1 << 8) | value; xfer.tx_buf = &data; xfer.bits_per_word = 16; xfer.len = 2; spi_message_add_tail(&xfer, &msg); ret = spi_sync(lcd->spi, &msg); if (ret < 0) dev_warn(&lcd->spi->dev, "failed to write to LCD reg (%d)\n", ret); return ret; } static void td043mtea1_write_gamma(struct td043mtea1_panel *lcd) { const u16 *gamma = lcd->gamma; unsigned int i; u8 val; /* gamma bits [9:8] */ for (val = i = 0; i < 4; i++) val |= (gamma[i] & 0x300) >> ((i + 1) * 2); td043mtea1_write(lcd, 0x11, val); for (val = i = 0; i < 4; i++) val |= (gamma[i + 4] & 0x300) >> ((i + 1) * 2); td043mtea1_write(lcd, 0x12, val); for (val = i = 0; i < 4; i++) val |= (gamma[i + 8] & 0x300) >> ((i + 1) * 2); td043mtea1_write(lcd, 0x13, val); /* gamma bits [7:0] */ for (i = 0; i < 12; i++) td043mtea1_write(lcd, 0x14 + i, gamma[i] & 0xff); } static int td043mtea1_write_mirror(struct td043mtea1_panel *lcd) { u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H; if (lcd->vmirror) reg4 &= ~TPO_R04_NFLIP_V; return td043mtea1_write(lcd, 4, reg4); } static int td043mtea1_power_on(struct td043mtea1_panel *lcd) { int ret; if (lcd->powered_on) return 0; ret = regulator_enable(lcd->vcc_reg); if (ret < 0) return ret; /* Wait for the panel to stabilize. */ msleep(160); gpiod_set_value(lcd->reset_gpio, 0); td043mtea1_write(lcd, 2, TPO_R02_MODE(lcd->mode) | TPO_R02_NCLK_RISING); td043mtea1_write(lcd, 3, TPO_R03_VAL_NORMAL); td043mtea1_write(lcd, 0x20, 0xf0); td043mtea1_write(lcd, 0x21, 0xf0); td043mtea1_write_mirror(lcd); td043mtea1_write_gamma(lcd); lcd->powered_on = true; return 0; } static void td043mtea1_power_off(struct td043mtea1_panel *lcd) { if (!lcd->powered_on) return; td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM); gpiod_set_value(lcd->reset_gpio, 1); /* wait for at least 2 vsyncs before cutting off power */ msleep(50); td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY); regulator_disable(lcd->vcc_reg); lcd->powered_on = false; } /* ----------------------------------------------------------------------------- * sysfs */ static ssize_t vmirror_show(struct device *dev, struct device_attribute *attr, char *buf) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); return sysfs_emit(buf, "%d\n", lcd->vmirror); } static ssize_t vmirror_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); int val; int ret; ret = kstrtoint(buf, 0, &val); if (ret < 0) return ret; lcd->vmirror = !!val; ret = td043mtea1_write_mirror(lcd); if (ret < 0) return ret; return count; } static ssize_t mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); return sysfs_emit(buf, "%d\n", lcd->mode); } static ssize_t mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); long val; int ret; ret = kstrtol(buf, 0, &val); if (ret != 0 || val & ~7) return -EINVAL; lcd->mode = val; val |= TPO_R02_NCLK_RISING; td043mtea1_write(lcd, 2, val); return count; } static ssize_t gamma_show(struct device *dev, struct device_attribute *attr, char *buf) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); ssize_t len = 0; unsigned int i; int ret; for (i = 0; i < ARRAY_SIZE(lcd->gamma); i++) { ret = snprintf(buf + len, PAGE_SIZE - len, "%u ", lcd->gamma[i]); if (ret < 0) return ret; len += ret; } buf[len - 1] = '\n'; return len; } static ssize_t gamma_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); unsigned int g[12]; unsigned int i; int ret; ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u", &g[0], &g[1], &g[2], &g[3], &g[4], &g[5], &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]); if (ret != 12) return -EINVAL; for (i = 0; i < 12; i++) lcd->gamma[i] = g[i]; td043mtea1_write_gamma(lcd); return count; } static DEVICE_ATTR_RW(vmirror); static DEVICE_ATTR_RW(mode); static DEVICE_ATTR_RW(gamma); static struct attribute *td043mtea1_attrs[] = { &dev_attr_vmirror.attr, &dev_attr_mode.attr, &dev_attr_gamma.attr, NULL, }; static const struct attribute_group td043mtea1_attr_group = { .attrs = td043mtea1_attrs, }; /* ----------------------------------------------------------------------------- * Panel Operations */ static int td043mtea1_unprepare(struct drm_panel *panel) { struct td043mtea1_panel *lcd = to_td043mtea1_device(panel); if (!lcd->spi_suspended) td043mtea1_power_off(lcd); return 0; } static int td043mtea1_prepare(struct drm_panel *panel) { struct td043mtea1_panel *lcd = to_td043mtea1_device(panel); int ret; /* * If we are resuming from system suspend, SPI might not be enabled * yet, so we'll program the LCD from SPI PM resume callback. */ if (lcd->spi_suspended) return 0; ret = td043mtea1_power_on(lcd); if (ret) { dev_err(&lcd->spi->dev, "%s: power on failed (%d)\n", __func__, ret); return ret; } return 0; } static const struct drm_display_mode td043mtea1_mode = { .clock = 36000, .hdisplay = 800, .hsync_start = 800 + 68, .hsync_end = 800 + 68 + 1, .htotal = 800 + 68 + 1 + 214, .vdisplay = 480, .vsync_start = 480 + 39, .vsync_end = 480 + 39 + 1, .vtotal = 480 + 39 + 1 + 34, .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, .width_mm = 94, .height_mm = 56, }; static int td043mtea1_get_modes(struct drm_panel *panel, struct drm_connector *connector) { struct drm_display_mode *mode; mode = drm_mode_duplicate(connector->dev, &td043mtea1_mode); if (!mode) return -ENOMEM; drm_mode_set_name(mode); drm_mode_probed_add(connector, mode); connector->display_info.width_mm = td043mtea1_mode.width_mm; connector->display_info.height_mm = td043mtea1_mode.height_mm; /* * FIXME: According to the datasheet sync signals are sampled on the * rising edge of the clock, but the code running on the OMAP3 Pandora * indicates sampling on the falling edge. This should be tested on a * real device. */ connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE | DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE; return 1; } static const struct drm_panel_funcs td043mtea1_funcs = { .unprepare = td043mtea1_unprepare, .prepare = td043mtea1_prepare, .get_modes = td043mtea1_get_modes, }; /* ----------------------------------------------------------------------------- * Power Management, Probe and Remove */ static int __maybe_unused td043mtea1_suspend(struct device *dev) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); if (lcd->powered_on) { td043mtea1_power_off(lcd); lcd->powered_on = true; } lcd->spi_suspended = true; return 0; } static int __maybe_unused td043mtea1_resume(struct device *dev) { struct td043mtea1_panel *lcd = dev_get_drvdata(dev); int ret; lcd->spi_suspended = false; if (lcd->powered_on) { lcd->powered_on = false; ret = td043mtea1_power_on(lcd); if (ret) return ret; } return 0; } static SIMPLE_DEV_PM_OPS(td043mtea1_pm_ops, td043mtea1_suspend, td043mtea1_resume); static int td043mtea1_probe(struct spi_device *spi) { struct td043mtea1_panel *lcd; int ret; lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL); if (lcd == NULL) return -ENOMEM; spi_set_drvdata(spi, lcd); lcd->spi = spi; lcd->mode = TPO_R02_MODE_800x480; memcpy(lcd->gamma, td043mtea1_def_gamma, sizeof(lcd->gamma)); lcd->vcc_reg = devm_regulator_get(&spi->dev, "vcc"); if (IS_ERR(lcd->vcc_reg)) { dev_err(&spi->dev, "failed to get VCC regulator\n"); return PTR_ERR(lcd->vcc_reg); } lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(lcd->reset_gpio)) { dev_err(&spi->dev, "failed to get reset GPIO\n"); return PTR_ERR(lcd->reset_gpio); } spi->bits_per_word = 16; spi->mode = SPI_MODE_0; ret = spi_setup(spi); if (ret < 0) { dev_err(&spi->dev, "failed to setup SPI: %d\n", ret); return ret; } ret = sysfs_create_group(&spi->dev.kobj, &td043mtea1_attr_group); if (ret < 0) { dev_err(&spi->dev, "failed to create sysfs files\n"); return ret; } drm_panel_init(&lcd->panel, &lcd->spi->dev, &td043mtea1_funcs, DRM_MODE_CONNECTOR_DPI); drm_panel_add(&lcd->panel); return 0; } static int td043mtea1_remove(struct spi_device *spi) { struct td043mtea1_panel *lcd = spi_get_drvdata(spi); drm_panel_remove(&lcd->panel); drm_panel_disable(&lcd->panel); drm_panel_unprepare(&lcd->panel); sysfs_remove_group(&spi->dev.kobj, &td043mtea1_attr_group); return 0; } static const struct of_device_id td043mtea1_of_match[] = { { .compatible = "tpo,td043mtea1", }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, td043mtea1_of_match); static const struct spi_device_id td043mtea1_ids[] = { { "td043mtea1", 0 }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(spi, td043mtea1_ids); static struct spi_driver td043mtea1_driver = { .probe = td043mtea1_probe, .remove = td043mtea1_remove, .id_table = td043mtea1_ids, .driver = { .name = "panel-tpo-td043mtea1", .pm = &td043mtea1_pm_ops, .of_match_table = td043mtea1_of_match, }, }; module_spi_driver(td043mtea1_driver); MODULE_AUTHOR("Gražvydas Ignotas "); MODULE_DESCRIPTION("TPO TD043MTEA1 Panel Driver"); MODULE_LICENSE("GPL");