| /* |
| * 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 <linux/slab.h> |
| |
| #include <video/omapdss.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; |
| int nreset_gpio; |
| u16 gamma[12]; |
| u32 mode; |
| u32 hmirror:1; |
| u32 vmirror:1; |
| u32 powered_on:1; |
| u32 spi_suspended:1; |
| u32 power_on_resume: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); |
| int val; |
| int ret; |
| |
| ret = kstrtoint(buf, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| val = !!val; |
| |
| 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 = kstrtol(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 tpo_td043_device *tpo_td043) |
| { |
| int nreset_gpio = tpo_td043->nreset_gpio; |
| |
| if (tpo_td043->powered_on) |
| return 0; |
| |
| regulator_enable(tpo_td043->vcc_reg); |
| |
| /* wait for regulator to stabilize */ |
| 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); |
| |
| tpo_td043->powered_on = 1; |
| return 0; |
| } |
| |
| static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043) |
| { |
| int nreset_gpio = tpo_td043->nreset_gpio; |
| |
| if (!tpo_td043->powered_on) |
| return; |
| |
| 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); |
| |
| tpo_td043->powered_on = 0; |
| } |
| |
| static int tpo_td043_enable_dss(struct omap_dss_device *dssdev) |
| { |
| struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); |
| int r; |
| |
| if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) |
| return 0; |
| |
| r = omapdss_dpi_display_enable(dssdev); |
| if (r) |
| goto err0; |
| |
| if (dssdev->platform_enable) { |
| r = dssdev->platform_enable(dssdev); |
| if (r) |
| goto err1; |
| } |
| |
| /* |
| * If we are resuming from system suspend, SPI clocks might not be |
| * enabled yet, so we'll program the LCD from SPI PM resume callback. |
| */ |
| if (!tpo_td043->spi_suspended) { |
| r = tpo_td043_power_on(tpo_td043); |
| if (r) |
| goto err1; |
| } |
| |
| dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; |
| |
| return 0; |
| err1: |
| omapdss_dpi_display_disable(dssdev); |
| err0: |
| return r; |
| } |
| |
| static void tpo_td043_disable_dss(struct omap_dss_device *dssdev) |
| { |
| struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev); |
| |
| if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) |
| return; |
| |
| if (dssdev->platform_disable) |
| dssdev->platform_disable(dssdev); |
| |
| omapdss_dpi_display_disable(dssdev); |
| |
| if (!tpo_td043->spi_suspended) |
| tpo_td043_power_off(tpo_td043); |
| } |
| |
| static int tpo_td043_enable(struct omap_dss_device *dssdev) |
| { |
| dev_dbg(&dssdev->dev, "enable\n"); |
| |
| return tpo_td043_enable_dss(dssdev); |
| } |
| |
| static void tpo_td043_disable(struct omap_dss_device *dssdev) |
| { |
| dev_dbg(&dssdev->dev, "disable\n"); |
| |
| tpo_td043_disable_dss(dssdev); |
| |
| dssdev->state = OMAP_DSS_DISPLAY_DISABLED; |
| } |
| |
| static int tpo_td043_suspend(struct omap_dss_device *dssdev) |
| { |
| dev_dbg(&dssdev->dev, "suspend\n"); |
| |
| tpo_td043_disable_dss(dssdev); |
| |
| dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED; |
| |
| return 0; |
| } |
| |
| static int tpo_td043_resume(struct omap_dss_device *dssdev) |
| { |
| dev_dbg(&dssdev->dev, "resume\n"); |
| |
| return tpo_td043_enable_dss(dssdev); |
| } |
| |
| 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; |
| tpo_td043->nreset_gpio = dssdev->reset_gpio; |
| 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; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int tpo_td043_spi_suspend(struct device *dev) |
| { |
| struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); |
| |
| dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043); |
| |
| tpo_td043->power_on_resume = tpo_td043->powered_on; |
| tpo_td043_power_off(tpo_td043); |
| tpo_td043->spi_suspended = 1; |
| |
| return 0; |
| } |
| |
| static int tpo_td043_spi_resume(struct device *dev) |
| { |
| struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev); |
| int ret; |
| |
| dev_dbg(dev, "tpo_td043_spi_resume\n"); |
| |
| if (tpo_td043->power_on_resume) { |
| ret = tpo_td043_power_on(tpo_td043); |
| if (ret) |
| return ret; |
| } |
| tpo_td043->spi_suspended = 0; |
| |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm, |
| tpo_td043_spi_suspend, tpo_td043_spi_resume); |
| |
| static struct spi_driver tpo_td043_spi_driver = { |
| .driver = { |
| .name = "tpo_td043mtea1_panel_spi", |
| .owner = THIS_MODULE, |
| .pm = &tpo_td043_spi_pm, |
| }, |
| .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"); |