/* * Support for ACX565AKM LCD Panel used on Nokia N900 * * Copyright (C) 2010 Nokia Corporation * * Original Driver Author: Imre Deak <imre.deak@nokia.com> * Based on panel-generic.c by Tomi Valkeinen <tomi.valkeinen@nokia.com> * Adapted to new DSS2 framework: Roger Quadros <roger.quadros@nokia.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/spi/spi.h> #include <linux/jiffies.h> #include <linux/sched.h> #include <linux/backlight.h> #include <linux/fb.h> #include <plat/display.h> #define MIPID_CMD_READ_DISP_ID 0x04 #define MIPID_CMD_READ_RED 0x06 #define MIPID_CMD_READ_GREEN 0x07 #define MIPID_CMD_READ_BLUE 0x08 #define MIPID_CMD_READ_DISP_STATUS 0x09 #define MIPID_CMD_RDDSDR 0x0F #define MIPID_CMD_SLEEP_IN 0x10 #define MIPID_CMD_SLEEP_OUT 0x11 #define MIPID_CMD_DISP_OFF 0x28 #define MIPID_CMD_DISP_ON 0x29 #define MIPID_CMD_WRITE_DISP_BRIGHTNESS 0x51 #define MIPID_CMD_READ_DISP_BRIGHTNESS 0x52 #define MIPID_CMD_WRITE_CTRL_DISP 0x53 #define CTRL_DISP_BRIGHTNESS_CTRL_ON (1 << 5) #define CTRL_DISP_AMBIENT_LIGHT_CTRL_ON (1 << 4) #define CTRL_DISP_BACKLIGHT_ON (1 << 2) #define CTRL_DISP_AUTO_BRIGHTNESS_ON (1 << 1) #define MIPID_CMD_READ_CTRL_DISP 0x54 #define MIPID_CMD_WRITE_CABC 0x55 #define MIPID_CMD_READ_CABC 0x56 #define MIPID_VER_LPH8923 3 #define MIPID_VER_LS041Y3 4 #define MIPID_VER_L4F00311 8 #define MIPID_VER_ACX565AKM 9 struct acx565akm_device { char *name; int enabled; int model; int revision; u8 display_id[3]; unsigned has_bc:1; unsigned has_cabc:1; unsigned cabc_mode; unsigned long hw_guard_end; /* next value of jiffies when we can issue the next sleep in/out command */ unsigned long hw_guard_wait; /* max guard time in jiffies */ struct spi_device *spi; struct mutex mutex; struct omap_dss_device *dssdev; struct backlight_device *bl_dev; }; static struct acx565akm_device acx_dev; static int acx565akm_bl_update_status(struct backlight_device *dev); /*--------------------MIPID interface-----------------------------*/ static void acx565akm_transfer(struct acx565akm_device *md, int cmd, const u8 *wbuf, int wlen, u8 *rbuf, int rlen) { struct spi_message m; struct spi_transfer *x, xfer[5]; int r; BUG_ON(md->spi == NULL); spi_message_init(&m); memset(xfer, 0, sizeof(xfer)); x = &xfer[0]; cmd &= 0xff; x->tx_buf = &cmd; x->bits_per_word = 9; x->len = 2; if (rlen > 1 && wlen == 0) { /* * Between the command and the response data there is a * dummy clock cycle. Add an extra bit after the command * word to account for this. */ x->bits_per_word = 10; cmd <<= 1; } spi_message_add_tail(x, &m); if (wlen) { x++; x->tx_buf = wbuf; x->len = wlen; x->bits_per_word = 9; spi_message_add_tail(x, &m); } if (rlen) { x++; x->rx_buf = rbuf; x->len = rlen; spi_message_add_tail(x, &m); } r = spi_sync(md->spi, &m); if (r < 0) dev_dbg(&md->spi->dev, "spi_sync %d\n", r); } static inline void acx565akm_cmd(struct acx565akm_device *md, int cmd) { acx565akm_transfer(md, cmd, NULL, 0, NULL, 0); } static inline void acx565akm_write(struct acx565akm_device *md, int reg, const u8 *buf, int len) { acx565akm_transfer(md, reg, buf, len, NULL, 0); } static inline void acx565akm_read(struct acx565akm_device *md, int reg, u8 *buf, int len) { acx565akm_transfer(md, reg, NULL, 0, buf, len); } static void hw_guard_start(struct acx565akm_device *md, int guard_msec) { md->hw_guard_wait = msecs_to_jiffies(guard_msec); md->hw_guard_end = jiffies + md->hw_guard_wait; } static void hw_guard_wait(struct acx565akm_device *md) { unsigned long wait = md->hw_guard_end - jiffies; if ((long)wait > 0 && wait <= md->hw_guard_wait) { set_current_state(TASK_UNINTERRUPTIBLE); schedule_timeout(wait); } } /*----------------------MIPID wrappers----------------------------*/ static void set_sleep_mode(struct acx565akm_device *md, int on) { int cmd; if (on) cmd = MIPID_CMD_SLEEP_IN; else cmd = MIPID_CMD_SLEEP_OUT; /* * We have to keep 120msec between sleep in/out commands. * (8.2.15, 8.2.16). */ hw_guard_wait(md); acx565akm_cmd(md, cmd); hw_guard_start(md, 120); } static void set_display_state(struct acx565akm_device *md, int enabled) { int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF; acx565akm_cmd(md, cmd); } static int panel_enabled(struct acx565akm_device *md) { u32 disp_status; int enabled; acx565akm_read(md, MIPID_CMD_READ_DISP_STATUS, (u8 *)&disp_status, 4); disp_status = __be32_to_cpu(disp_status); enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10)); dev_dbg(&md->spi->dev, "LCD panel %senabled by bootloader (status 0x%04x)\n", enabled ? "" : "not ", disp_status); return enabled; } static int panel_detect(struct acx565akm_device *md) { acx565akm_read(md, MIPID_CMD_READ_DISP_ID, md->display_id, 3); dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n", md->display_id[0], md->display_id[1], md->display_id[2]); switch (md->display_id[0]) { case 0x10: md->model = MIPID_VER_ACX565AKM; md->name = "acx565akm"; md->has_bc = 1; md->has_cabc = 1; break; case 0x29: md->model = MIPID_VER_L4F00311; md->name = "l4f00311"; break; case 0x45: md->model = MIPID_VER_LPH8923; md->name = "lph8923"; break; case 0x83: md->model = MIPID_VER_LS041Y3; md->name = "ls041y3"; break; default: md->name = "unknown"; dev_err(&md->spi->dev, "invalid display ID\n"); return -ENODEV; } md->revision = md->display_id[1]; dev_info(&md->spi->dev, "omapfb: %s rev %02x LCD detected\n", md->name, md->revision); return 0; } /*----------------------Backlight Control-------------------------*/ static void enable_backlight_ctrl(struct acx565akm_device *md, int enable) { u16 ctrl; acx565akm_read(md, MIPID_CMD_READ_CTRL_DISP, (u8 *)&ctrl, 1); if (enable) { ctrl |= CTRL_DISP_BRIGHTNESS_CTRL_ON | CTRL_DISP_BACKLIGHT_ON; } else { ctrl &= ~(CTRL_DISP_BRIGHTNESS_CTRL_ON | CTRL_DISP_BACKLIGHT_ON); } ctrl |= 1 << 8; acx565akm_write(md, MIPID_CMD_WRITE_CTRL_DISP, (u8 *)&ctrl, 2); } static void set_cabc_mode(struct acx565akm_device *md, unsigned mode) { u16 cabc_ctrl; md->cabc_mode = mode; if (!md->enabled) return; cabc_ctrl = 0; acx565akm_read(md, MIPID_CMD_READ_CABC, (u8 *)&cabc_ctrl, 1); cabc_ctrl &= ~3; cabc_ctrl |= (1 << 8) | (mode & 3); acx565akm_write(md, MIPID_CMD_WRITE_CABC, (u8 *)&cabc_ctrl, 2); } static unsigned get_cabc_mode(struct acx565akm_device *md) { return md->cabc_mode; } static unsigned get_hw_cabc_mode(struct acx565akm_device *md) { u8 cabc_ctrl; acx565akm_read(md, MIPID_CMD_READ_CABC, &cabc_ctrl, 1); return cabc_ctrl & 3; } static void acx565akm_set_brightness(struct acx565akm_device *md, int level) { int bv; bv = level | (1 << 8); acx565akm_write(md, MIPID_CMD_WRITE_DISP_BRIGHTNESS, (u8 *)&bv, 2); if (level) enable_backlight_ctrl(md, 1); else enable_backlight_ctrl(md, 0); } static int acx565akm_get_actual_brightness(struct acx565akm_device *md) { u8 bv; acx565akm_read(md, MIPID_CMD_READ_DISP_BRIGHTNESS, &bv, 1); return bv; } static int acx565akm_bl_update_status(struct backlight_device *dev) { struct acx565akm_device *md = dev_get_drvdata(&dev->dev); int r; int level; dev_dbg(&md->spi->dev, "%s\n", __func__); mutex_lock(&md->mutex); if (dev->props.fb_blank == FB_BLANK_UNBLANK && dev->props.power == FB_BLANK_UNBLANK) level = dev->props.brightness; else level = 0; r = 0; if (md->has_bc) acx565akm_set_brightness(md, level); else if (md->dssdev->set_backlight) r = md->dssdev->set_backlight(md->dssdev, level); else r = -ENODEV; mutex_unlock(&md->mutex); return r; } static int acx565akm_bl_get_intensity(struct backlight_device *dev) { struct acx565akm_device *md = dev_get_drvdata(&dev->dev); dev_dbg(&dev->dev, "%s\n", __func__); if (!md->has_bc && md->dssdev->set_backlight == NULL) return -ENODEV; if (dev->props.fb_blank == FB_BLANK_UNBLANK && dev->props.power == FB_BLANK_UNBLANK) { if (md->has_bc) return acx565akm_get_actual_brightness(md); else return dev->props.brightness; } return 0; } static const struct backlight_ops acx565akm_bl_ops = { .get_brightness = acx565akm_bl_get_intensity, .update_status = acx565akm_bl_update_status, }; /*--------------------Auto Brightness control via Sysfs---------------------*/ static const char *cabc_modes[] = { "off", /* always used when CABC is not supported */ "ui", "still-image", "moving-image", }; static ssize_t show_cabc_mode(struct device *dev, struct device_attribute *attr, char *buf) { struct acx565akm_device *md = dev_get_drvdata(dev); const char *mode_str; int mode; int len; if (!md->has_cabc) mode = 0; else mode = get_cabc_mode(md); mode_str = "unknown"; if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes)) mode_str = cabc_modes[mode]; len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str); return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1; } static ssize_t store_cabc_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct acx565akm_device *md = dev_get_drvdata(dev); int i; for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) { const char *mode_str = cabc_modes[i]; int cmp_len = strlen(mode_str); if (count > 0 && buf[count - 1] == '\n') count--; if (count != cmp_len) continue; if (strncmp(buf, mode_str, cmp_len) == 0) break; } if (i == ARRAY_SIZE(cabc_modes)) return -EINVAL; if (!md->has_cabc && i != 0) return -EINVAL; mutex_lock(&md->mutex); set_cabc_mode(md, i); mutex_unlock(&md->mutex); return count; } static ssize_t show_cabc_available_modes(struct device *dev, struct device_attribute *attr, char *buf) { struct acx565akm_device *md = dev_get_drvdata(dev); int len; int i; if (!md->has_cabc) return snprintf(buf, PAGE_SIZE, "%s\n", cabc_modes[0]); for (i = 0, len = 0; len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++) len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s", i ? " " : "", cabc_modes[i], i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : ""); return len < PAGE_SIZE ? len : PAGE_SIZE - 1; } static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR, show_cabc_mode, store_cabc_mode); static DEVICE_ATTR(cabc_available_modes, S_IRUGO, show_cabc_available_modes, NULL); static struct attribute *bldev_attrs[] = { &dev_attr_cabc_mode.attr, &dev_attr_cabc_available_modes.attr, NULL, }; static struct attribute_group bldev_attr_group = { .attrs = bldev_attrs, }; /*---------------------------ACX Panel----------------------------*/ static int acx_get_recommended_bpp(struct omap_dss_device *dssdev) { return 16; } static struct omap_video_timings acx_panel_timings = { .x_res = 800, .y_res = 480, .pixel_clock = 24000, .hfp = 28, .hsw = 4, .hbp = 24, .vfp = 3, .vsw = 3, .vbp = 4, }; static int acx_panel_probe(struct omap_dss_device *dssdev) { int r; struct acx565akm_device *md = &acx_dev; struct backlight_device *bldev; int max_brightness, brightness; struct backlight_properties props; dev_dbg(&dssdev->dev, "%s\n", __func__); dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IHS; /* FIXME AC bias ? */ dssdev->panel.timings = acx_panel_timings; if (dssdev->platform_enable) dssdev->platform_enable(dssdev); /* * After reset we have to wait 5 msec before the first * command can be sent. */ msleep(5); md->enabled = panel_enabled(md); r = panel_detect(md); if (r) { dev_err(&dssdev->dev, "%s panel detect error\n", __func__); if (!md->enabled && dssdev->platform_disable) dssdev->platform_disable(dssdev); return r; } mutex_lock(&acx_dev.mutex); acx_dev.dssdev = dssdev; mutex_unlock(&acx_dev.mutex); if (!md->enabled) { if (dssdev->platform_disable) dssdev->platform_disable(dssdev); } /*------- Backlight control --------*/ props.fb_blank = FB_BLANK_UNBLANK; props.power = FB_BLANK_UNBLANK; bldev = backlight_device_register("acx565akm", &md->spi->dev, md, &acx565akm_bl_ops, &props); md->bl_dev = bldev; if (md->has_cabc) { r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group); if (r) { dev_err(&bldev->dev, "%s failed to create sysfs files\n", __func__); backlight_device_unregister(bldev); return r; } md->cabc_mode = get_hw_cabc_mode(md); } if (md->has_bc) max_brightness = 255; else max_brightness = dssdev->max_backlight_level; if (md->has_bc) brightness = acx565akm_get_actual_brightness(md); else if (dssdev->get_backlight) brightness = dssdev->get_backlight(dssdev); else brightness = 0; bldev->props.max_brightness = max_brightness; bldev->props.brightness = brightness; acx565akm_bl_update_status(bldev); return 0; } static void acx_panel_remove(struct omap_dss_device *dssdev) { struct acx565akm_device *md = &acx_dev; dev_dbg(&dssdev->dev, "%s\n", __func__); sysfs_remove_group(&md->bl_dev->dev.kobj, &bldev_attr_group); backlight_device_unregister(md->bl_dev); mutex_lock(&acx_dev.mutex); acx_dev.dssdev = NULL; mutex_unlock(&acx_dev.mutex); } static int acx_panel_power_on(struct omap_dss_device *dssdev) { struct acx565akm_device *md = &acx_dev; int r; dev_dbg(&dssdev->dev, "%s\n", __func__); mutex_lock(&md->mutex); r = omapdss_sdi_display_enable(dssdev); if (r) { pr_err("%s sdi enable failed\n", __func__); return r; } /*FIXME tweak me */ msleep(50); if (dssdev->platform_enable) { r = dssdev->platform_enable(dssdev); if (r) goto fail; } if (md->enabled) { dev_dbg(&md->spi->dev, "panel already enabled\n"); mutex_unlock(&md->mutex); return 0; } /* * We have to meet all the following delay requirements: * 1. tRW: reset pulse width 10usec (7.12.1) * 2. tRT: reset cancel time 5msec (7.12.1) * 3. Providing PCLK,HS,VS signals for 2 frames = ~50msec worst * case (7.6.2) * 4. 120msec before the sleep out command (7.12.1) */ msleep(120); set_sleep_mode(md, 0); md->enabled = 1; /* 5msec between sleep out and the next command. (8.2.16) */ msleep(5); set_display_state(md, 1); set_cabc_mode(md, md->cabc_mode); mutex_unlock(&md->mutex); return acx565akm_bl_update_status(md->bl_dev); fail: omapdss_sdi_display_disable(dssdev); return r; } static void acx_panel_power_off(struct omap_dss_device *dssdev) { struct acx565akm_device *md = &acx_dev; dev_dbg(&dssdev->dev, "%s\n", __func__); mutex_lock(&md->mutex); if (!md->enabled) { mutex_unlock(&md->mutex); return; } set_display_state(md, 0); set_sleep_mode(md, 1); md->enabled = 0; /* * We have to provide PCLK,HS,VS signals for 2 frames (worst case * ~50msec) after sending the sleep in command and asserting the * reset signal. We probably could assert the reset w/o the delay * but we still delay to avoid possible artifacts. (7.6.1) */ msleep(50); if (dssdev->platform_disable) dssdev->platform_disable(dssdev); /* FIXME need to tweak this delay */ msleep(100); omapdss_sdi_display_disable(dssdev); mutex_unlock(&md->mutex); } static int acx_panel_enable(struct omap_dss_device *dssdev) { int r; dev_dbg(&dssdev->dev, "%s\n", __func__); r = acx_panel_power_on(dssdev); if (r) return r; dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; return 0; } static void acx_panel_disable(struct omap_dss_device *dssdev) { dev_dbg(&dssdev->dev, "%s\n", __func__); acx_panel_power_off(dssdev); dssdev->state = OMAP_DSS_DISPLAY_DISABLED; } static int acx_panel_suspend(struct omap_dss_device *dssdev) { dev_dbg(&dssdev->dev, "%s\n", __func__); acx_panel_power_off(dssdev); dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED; return 0; } static int acx_panel_resume(struct omap_dss_device *dssdev) { int r; dev_dbg(&dssdev->dev, "%s\n", __func__); r = acx_panel_power_on(dssdev); if (r) return r; dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; return 0; } static void acx_panel_set_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { int r; if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) omapdss_sdi_display_disable(dssdev); dssdev->panel.timings = *timings; if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) { r = omapdss_sdi_display_enable(dssdev); if (r) dev_err(&dssdev->dev, "%s enable failed\n", __func__); } } static void acx_panel_get_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { *timings = dssdev->panel.timings; } static int acx_panel_check_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { return 0; } static struct omap_dss_driver acx_panel_driver = { .probe = acx_panel_probe, .remove = acx_panel_remove, .enable = acx_panel_enable, .disable = acx_panel_disable, .suspend = acx_panel_suspend, .resume = acx_panel_resume, .set_timings = acx_panel_set_timings, .get_timings = acx_panel_get_timings, .check_timings = acx_panel_check_timings, .get_recommended_bpp = acx_get_recommended_bpp, .driver = { .name = "panel-acx565akm", .owner = THIS_MODULE, }, }; /*--------------------SPI probe-------------------------*/ static int acx565akm_spi_probe(struct spi_device *spi) { struct acx565akm_device *md = &acx_dev; dev_dbg(&spi->dev, "%s\n", __func__); spi->mode = SPI_MODE_3; md->spi = spi; mutex_init(&md->mutex); dev_set_drvdata(&spi->dev, md); omap_dss_register_driver(&acx_panel_driver); return 0; } static int acx565akm_spi_remove(struct spi_device *spi) { struct acx565akm_device *md = dev_get_drvdata(&spi->dev); dev_dbg(&md->spi->dev, "%s\n", __func__); omap_dss_unregister_driver(&acx_panel_driver); return 0; } static struct spi_driver acx565akm_spi_driver = { .driver = { .name = "acx565akm", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = acx565akm_spi_probe, .remove = __devexit_p(acx565akm_spi_remove), }; static int __init acx565akm_init(void) { return spi_register_driver(&acx565akm_spi_driver); } static void __exit acx565akm_exit(void) { spi_unregister_driver(&acx565akm_spi_driver); } module_init(acx565akm_init); module_exit(acx565akm_exit); MODULE_AUTHOR("Nokia Corporation"); MODULE_DESCRIPTION("acx565akm LCD Driver"); MODULE_LICENSE("GPL");