/* * LCD panel driver for TPO TD043MTEA1 * * Author: Gražvydas Ignotas <notasas@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/module.h> #include <linux/delay.h> #include <linux/spi/spi.h> #include <linux/regulator/consumer.h> #include <linux/gpio.h> #include <linux/err.h> #include <plat/display.h> #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 tpo_td043_def_gamma[12] = { 106, 200, 289, 375, 460, 543, 625, 705, 785, 864, 942, 1020 }; struct tpo_td043_device { struct spi_device *spi; struct regulator *vcc_reg; u16 gamma[12]; u32 mode; u32 hmirror:1; u32 vmirror:1; }; static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data) { struct spi_message m; struct spi_transfer xfer; u16 w; int r; spi_message_init(&m); memset(&xfer, 0, sizeof(xfer)); w = ((u16)addr << 10) | (1 << 8) | data; xfer.tx_buf = &w; xfer.bits_per_word = 16; xfer.len = 2; spi_message_add_tail(&xfer, &m); r = spi_sync(spi, &m); if (r < 0) dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r); return r; } static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12]) { u8 i, val; /* gamma bits [9:8] */ for (val = i = 0; i < 4; i++) val |= (gamma[i] & 0x300) >> ((i + 1) * 2); tpo_td043_write(spi, 0x11, val); for (val = i = 0; i < 4; i++) val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2); tpo_td043_write(spi, 0x12, val); for (val = i = 0; i < 4; i++) val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2); tpo_td043_write(spi, 0x13, val); /* gamma bits [7:0] */ for (val = i = 0; i < 12; i++) tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff); } static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v) { u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \ TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H; if (h) reg4 &= ~TPO_R04_NFLIP_H; if (v) reg4 &= ~TPO_R04_NFLIP_V; return tpo_td043_write(spi, 4, reg4); } static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); tpo_td043->hmirror = enable; return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, tpo_td043->vmirror); } static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); return tpo_td043->hmirror; } static ssize_t tpo_td043_vmirror_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror); } static ssize_t tpo_td043_vmirror_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); long val; int ret; ret = strict_strtol(buf, 0, &val); if (ret < 0) return ret; ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val); if (ret < 0) return ret; tpo_td043->vmirror = val; return count; } static ssize_t tpo_td043_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode); } static ssize_t tpo_td043_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); long val; int ret; ret = strict_strtol(buf, 0, &val); if (ret != 0 || val & ~7) return -EINVAL; tpo_td043->mode = val; val |= TPO_R02_NCLK_RISING; tpo_td043_write(tpo_td043->spi, 2, val); return count; } static ssize_t tpo_td043_gamma_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); ssize_t len = 0; int ret; int i; for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) { ret = snprintf(buf + len, PAGE_SIZE - len, "%u ", tpo_td043->gamma[i]); if (ret < 0) return ret; len += ret; } buf[len - 1] = '\n'; return len; } static ssize_t tpo_td043_gamma_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); unsigned int g[12]; int ret; int i; 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++) tpo_td043->gamma[i] = g[i]; tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma); return count; } static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR, tpo_td043_vmirror_show, tpo_td043_vmirror_store); static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, tpo_td043_mode_show, tpo_td043_mode_store); static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR, tpo_td043_gamma_show, tpo_td043_gamma_store); static struct attribute *tpo_td043_attrs[] = { &dev_attr_vmirror.attr, &dev_attr_mode.attr, &dev_attr_gamma.attr, NULL, }; static struct attribute_group tpo_td043_attr_group = { .attrs = tpo_td043_attrs, }; static const struct omap_video_timings tpo_td043_timings = { .x_res = 800, .y_res = 480, .pixel_clock = 36000, .hsw = 1, .hfp = 68, .hbp = 214, .vsw = 1, .vfp = 39, .vbp = 34, }; static int tpo_td043_power_on(struct omap_dss_device *dssdev) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); int nreset_gpio = dssdev->reset_gpio; int r; r = omapdss_dpi_display_enable(dssdev); if (r) goto err0; if (dssdev->platform_enable) { r = dssdev->platform_enable(dssdev); if (r) goto err1; } regulator_enable(tpo_td043->vcc_reg); /* wait for power up */ msleep(160); if (gpio_is_valid(nreset_gpio)) gpio_set_value(nreset_gpio, 1); tpo_td043_write(tpo_td043->spi, 2, TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING); tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL); tpo_td043_write(tpo_td043->spi, 0x20, 0xf0); tpo_td043_write(tpo_td043->spi, 0x21, 0xf0); tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, tpo_td043->vmirror); tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma); return 0; err1: omapdss_dpi_display_disable(dssdev); err0: return r; } static void tpo_td043_power_off(struct omap_dss_device *dssdev) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); int nreset_gpio = dssdev->reset_gpio; tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM); if (gpio_is_valid(nreset_gpio)) gpio_set_value(nreset_gpio, 0); /* wait for at least 2 vsyncs before cutting off power */ msleep(50); tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY); regulator_disable(tpo_td043->vcc_reg); if (dssdev->platform_disable) dssdev->platform_disable(dssdev); omapdss_dpi_display_disable(dssdev); } static int tpo_td043_enable(struct omap_dss_device *dssdev) { int ret; dev_dbg(&dssdev->dev, "enable\n"); ret = tpo_td043_power_on(dssdev); if (ret) return ret; dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; return 0; } static void tpo_td043_disable(struct omap_dss_device *dssdev) { dev_dbg(&dssdev->dev, "disable\n"); tpo_td043_power_off(dssdev); dssdev->state = OMAP_DSS_DISPLAY_DISABLED; } static int tpo_td043_suspend(struct omap_dss_device *dssdev) { tpo_td043_power_off(dssdev); dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED; return 0; } static int tpo_td043_resume(struct omap_dss_device *dssdev) { int r = 0; r = tpo_td043_power_on(dssdev); if (r) return r; dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; return 0; } static int tpo_td043_probe(struct omap_dss_device *dssdev) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); int nreset_gpio = dssdev->reset_gpio; int ret = 0; dev_dbg(&dssdev->dev, "probe\n"); if (tpo_td043 == NULL) { dev_err(&dssdev->dev, "missing tpo_td043_device\n"); return -ENODEV; } dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS | OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC; dssdev->panel.timings = tpo_td043_timings; dssdev->ctrl.pixel_size = 24; tpo_td043->mode = TPO_R02_MODE_800x480; memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma)); tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc"); if (IS_ERR(tpo_td043->vcc_reg)) { dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n"); ret = PTR_ERR(tpo_td043->vcc_reg); goto fail_regulator; } if (gpio_is_valid(nreset_gpio)) { ret = gpio_request(nreset_gpio, "lcd reset"); if (ret < 0) { dev_err(&dssdev->dev, "couldn't request reset GPIO\n"); goto fail_gpio_req; } ret = gpio_direction_output(nreset_gpio, 0); if (ret < 0) { dev_err(&dssdev->dev, "couldn't set GPIO direction\n"); goto fail_gpio_direction; } } ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group); if (ret) dev_warn(&dssdev->dev, "failed to create sysfs files\n"); return 0; fail_gpio_direction: gpio_free(nreset_gpio); fail_gpio_req: regulator_put(tpo_td043->vcc_reg); fail_regulator: kfree(tpo_td043); return ret; } static void tpo_td043_remove(struct omap_dss_device *dssdev) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); int nreset_gpio = dssdev->reset_gpio; dev_dbg(&dssdev->dev, "remove\n"); sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group); regulator_put(tpo_td043->vcc_reg); if (gpio_is_valid(nreset_gpio)) gpio_free(nreset_gpio); } static struct omap_dss_driver tpo_td043_driver = { .probe = tpo_td043_probe, .remove = tpo_td043_remove, .enable = tpo_td043_enable, .disable = tpo_td043_disable, .suspend = tpo_td043_suspend, .resume = tpo_td043_resume, .set_mirror = tpo_td043_set_hmirror, .get_mirror = tpo_td043_get_hmirror, .driver = { .name = "tpo_td043mtea1_panel", .owner = THIS_MODULE, }, }; static int tpo_td043_spi_probe(struct spi_device *spi) { struct omap_dss_device *dssdev = spi->dev.platform_data; struct tpo_td043_device *tpo_td043; int ret; if (dssdev == NULL) { dev_err(&spi->dev, "missing dssdev\n"); return -ENODEV; } spi->bits_per_word = 16; spi->mode = SPI_MODE_0; ret = spi_setup(spi); if (ret < 0) { dev_err(&spi->dev, "spi_setup failed: %d\n", ret); return ret; } tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL); if (tpo_td043 == NULL) return -ENOMEM; tpo_td043->spi = spi; dev_set_drvdata(&spi->dev, tpo_td043); dev_set_drvdata(&dssdev->dev, tpo_td043); omap_dss_register_driver(&tpo_td043_driver); return 0; } static int __devexit tpo_td043_spi_remove(struct spi_device *spi) { struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev); omap_dss_unregister_driver(&tpo_td043_driver); kfree(tpo_td043); return 0; } static struct spi_driver tpo_td043_spi_driver = { .driver = { .name = "tpo_td043mtea1_panel_spi", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = tpo_td043_spi_probe, .remove = __devexit_p(tpo_td043_spi_remove), }; static int __init tpo_td043_init(void) { return spi_register_driver(&tpo_td043_spi_driver); } static void __exit tpo_td043_exit(void) { spi_unregister_driver(&tpo_td043_spi_driver); } module_init(tpo_td043_init); module_exit(tpo_td043_exit); MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>"); MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver"); MODULE_LICENSE("GPL");