/* * Taal DSI command mode panel * * Copyright (C) 2009 Nokia Corporation * Author: Tomi Valkeinen <tomi.valkeinen@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/>. */ /*#define DEBUG*/ #include <linux/module.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/jiffies.h> #include <linux/sched.h> #include <linux/backlight.h> #include <linux/fb.h> #include <linux/interrupt.h> #include <linux/gpio.h> #include <linux/workqueue.h> #include <linux/slab.h> #include <linux/regulator/consumer.h> #include <linux/mutex.h> #include <video/omapdss.h> #include <video/omap-panel-nokia-dsi.h> /* DSI Virtual channel. Hardcoded for now. */ #define TCH 0 #define DCS_READ_NUM_ERRORS 0x05 #define DCS_READ_POWER_MODE 0x0a #define DCS_READ_MADCTL 0x0b #define DCS_READ_PIXEL_FORMAT 0x0c #define DCS_RDDSDR 0x0f #define DCS_SLEEP_IN 0x10 #define DCS_SLEEP_OUT 0x11 #define DCS_DISPLAY_OFF 0x28 #define DCS_DISPLAY_ON 0x29 #define DCS_COLUMN_ADDR 0x2a #define DCS_PAGE_ADDR 0x2b #define DCS_MEMORY_WRITE 0x2c #define DCS_TEAR_OFF 0x34 #define DCS_TEAR_ON 0x35 #define DCS_MEM_ACC_CTRL 0x36 #define DCS_PIXEL_FORMAT 0x3a #define DCS_BRIGHTNESS 0x51 #define DCS_CTRL_DISPLAY 0x53 #define DCS_WRITE_CABC 0x55 #define DCS_READ_CABC 0x56 #define DCS_GET_ID1 0xda #define DCS_GET_ID2 0xdb #define DCS_GET_ID3 0xdc static irqreturn_t taal_te_isr(int irq, void *data); static void taal_te_timeout_work_callback(struct work_struct *work); static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable); static int taal_panel_reset(struct omap_dss_device *dssdev); struct panel_regulator { struct regulator *regulator; const char *name; int min_uV; int max_uV; }; static void free_regulators(struct panel_regulator *regulators, int n) { int i; for (i = 0; i < n; i++) { /* disable/put in reverse order */ regulator_disable(regulators[n - i - 1].regulator); regulator_put(regulators[n - i - 1].regulator); } } static int init_regulators(struct omap_dss_device *dssdev, struct panel_regulator *regulators, int n) { int r, i, v; for (i = 0; i < n; i++) { struct regulator *reg; reg = regulator_get(&dssdev->dev, regulators[i].name); if (IS_ERR(reg)) { dev_err(&dssdev->dev, "failed to get regulator %s\n", regulators[i].name); r = PTR_ERR(reg); goto err; } /* FIXME: better handling of fixed vs. variable regulators */ v = regulator_get_voltage(reg); if (v < regulators[i].min_uV || v > regulators[i].max_uV) { r = regulator_set_voltage(reg, regulators[i].min_uV, regulators[i].max_uV); if (r) { dev_err(&dssdev->dev, "failed to set regulator %s voltage\n", regulators[i].name); regulator_put(reg); goto err; } } r = regulator_enable(reg); if (r) { dev_err(&dssdev->dev, "failed to enable regulator %s\n", regulators[i].name); regulator_put(reg); goto err; } regulators[i].regulator = reg; } return 0; err: free_regulators(regulators, i); return r; } /** * struct panel_config - panel configuration * @name: panel name * @type: panel type * @timings: panel resolution * @sleep: various panel specific delays, passed to msleep() if non-zero * @reset_sequence: reset sequence timings, passed to udelay() if non-zero * @regulators: array of panel regulators * @num_regulators: number of regulators in the array */ struct panel_config { const char *name; int type; struct omap_video_timings timings; struct { unsigned int sleep_in; unsigned int sleep_out; unsigned int hw_reset; unsigned int enable_te; } sleep; struct { unsigned int high; unsigned int low; } reset_sequence; struct panel_regulator *regulators; int num_regulators; }; enum { PANEL_TAAL, }; static struct panel_config panel_configs[] = { { .name = "taal", .type = PANEL_TAAL, .timings = { .x_res = 864, .y_res = 480, }, .sleep = { .sleep_in = 5, .sleep_out = 5, .hw_reset = 5, .enable_te = 100, /* possible panel bug */ }, .reset_sequence = { .high = 10, .low = 10, }, }, }; struct taal_data { struct mutex lock; struct backlight_device *bldev; 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 omap_dss_device *dssdev; bool enabled; u8 rotate; bool mirror; bool te_enabled; atomic_t do_update; struct { u16 x; u16 y; u16 w; u16 h; } update_region; int channel; struct delayed_work te_timeout_work; bool use_dsi_bl; bool cabc_broken; unsigned cabc_mode; bool intro_printed; struct workqueue_struct *workqueue; struct delayed_work esd_work; unsigned esd_interval; bool ulps_enabled; unsigned ulps_timeout; struct delayed_work ulps_work; struct panel_config *panel_config; }; static inline struct nokia_dsi_panel_data *get_panel_data(const struct omap_dss_device *dssdev) { return (struct nokia_dsi_panel_data *) dssdev->data; } static void taal_esd_work(struct work_struct *work); static void taal_ulps_work(struct work_struct *work); static void hw_guard_start(struct taal_data *td, int guard_msec) { td->hw_guard_wait = msecs_to_jiffies(guard_msec); td->hw_guard_end = jiffies + td->hw_guard_wait; } static void hw_guard_wait(struct taal_data *td) { unsigned long wait = td->hw_guard_end - jiffies; if ((long)wait > 0 && wait <= td->hw_guard_wait) { set_current_state(TASK_UNINTERRUPTIBLE); schedule_timeout(wait); } } static int taal_dcs_read_1(struct taal_data *td, u8 dcs_cmd, u8 *data) { int r; u8 buf[1]; r = dsi_vc_dcs_read(td->dssdev, td->channel, dcs_cmd, buf, 1); if (r < 0) return r; *data = buf[0]; return 0; } static int taal_dcs_write_0(struct taal_data *td, u8 dcs_cmd) { return dsi_vc_dcs_write(td->dssdev, td->channel, &dcs_cmd, 1); } static int taal_dcs_write_1(struct taal_data *td, u8 dcs_cmd, u8 param) { u8 buf[2]; buf[0] = dcs_cmd; buf[1] = param; return dsi_vc_dcs_write(td->dssdev, td->channel, buf, 2); } static int taal_sleep_in(struct taal_data *td) { u8 cmd; int r; hw_guard_wait(td); cmd = DCS_SLEEP_IN; r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, &cmd, 1); if (r) return r; hw_guard_start(td, 120); if (td->panel_config->sleep.sleep_in) msleep(td->panel_config->sleep.sleep_in); return 0; } static int taal_sleep_out(struct taal_data *td) { int r; hw_guard_wait(td); r = taal_dcs_write_0(td, DCS_SLEEP_OUT); if (r) return r; hw_guard_start(td, 120); if (td->panel_config->sleep.sleep_out) msleep(td->panel_config->sleep.sleep_out); return 0; } static int taal_get_id(struct taal_data *td, u8 *id1, u8 *id2, u8 *id3) { int r; r = taal_dcs_read_1(td, DCS_GET_ID1, id1); if (r) return r; r = taal_dcs_read_1(td, DCS_GET_ID2, id2); if (r) return r; r = taal_dcs_read_1(td, DCS_GET_ID3, id3); if (r) return r; return 0; } static int taal_set_addr_mode(struct taal_data *td, u8 rotate, bool mirror) { int r; u8 mode; int b5, b6, b7; r = taal_dcs_read_1(td, DCS_READ_MADCTL, &mode); if (r) return r; switch (rotate) { default: case 0: b7 = 0; b6 = 0; b5 = 0; break; case 1: b7 = 0; b6 = 1; b5 = 1; break; case 2: b7 = 1; b6 = 1; b5 = 0; break; case 3: b7 = 1; b6 = 0; b5 = 1; break; } if (mirror) b6 = !b6; mode &= ~((1<<7) | (1<<6) | (1<<5)); mode |= (b7 << 7) | (b6 << 6) | (b5 << 5); return taal_dcs_write_1(td, DCS_MEM_ACC_CTRL, mode); } static int taal_set_update_window(struct taal_data *td, u16 x, u16 y, u16 w, u16 h) { int r; u16 x1 = x; u16 x2 = x + w - 1; u16 y1 = y; u16 y2 = y + h - 1; u8 buf[5]; buf[0] = DCS_COLUMN_ADDR; buf[1] = (x1 >> 8) & 0xff; buf[2] = (x1 >> 0) & 0xff; buf[3] = (x2 >> 8) & 0xff; buf[4] = (x2 >> 0) & 0xff; r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf)); if (r) return r; buf[0] = DCS_PAGE_ADDR; buf[1] = (y1 >> 8) & 0xff; buf[2] = (y1 >> 0) & 0xff; buf[3] = (y2 >> 8) & 0xff; buf[4] = (y2 >> 0) & 0xff; r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf)); if (r) return r; dsi_vc_send_bta_sync(td->dssdev, td->channel); return r; } static void taal_queue_esd_work(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); if (td->esd_interval > 0) queue_delayed_work(td->workqueue, &td->esd_work, msecs_to_jiffies(td->esd_interval)); } static void taal_cancel_esd_work(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); cancel_delayed_work(&td->esd_work); } static void taal_queue_ulps_work(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); if (td->ulps_timeout > 0) queue_delayed_work(td->workqueue, &td->ulps_work, msecs_to_jiffies(td->ulps_timeout)); } static void taal_cancel_ulps_work(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); cancel_delayed_work(&td->ulps_work); } static int taal_enter_ulps(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); int r; if (td->ulps_enabled) return 0; taal_cancel_ulps_work(dssdev); r = _taal_enable_te(dssdev, false); if (r) goto err; disable_irq(gpio_to_irq(panel_data->ext_te_gpio)); omapdss_dsi_display_disable(dssdev, false, true); td->ulps_enabled = true; return 0; err: dev_err(&dssdev->dev, "enter ULPS failed"); taal_panel_reset(dssdev); td->ulps_enabled = false; taal_queue_ulps_work(dssdev); return r; } static int taal_exit_ulps(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); int r; if (!td->ulps_enabled) return 0; r = omapdss_dsi_display_enable(dssdev); if (r) { dev_err(&dssdev->dev, "failed to enable DSI\n"); goto err1; } omapdss_dsi_vc_enable_hs(dssdev, td->channel, true); r = _taal_enable_te(dssdev, true); if (r) { dev_err(&dssdev->dev, "failed to re-enable TE"); goto err2; } enable_irq(gpio_to_irq(panel_data->ext_te_gpio)); taal_queue_ulps_work(dssdev); td->ulps_enabled = false; return 0; err2: dev_err(&dssdev->dev, "failed to exit ULPS"); r = taal_panel_reset(dssdev); if (!r) { enable_irq(gpio_to_irq(panel_data->ext_te_gpio)); td->ulps_enabled = false; } err1: taal_queue_ulps_work(dssdev); return r; } static int taal_wake_up(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); if (td->ulps_enabled) return taal_exit_ulps(dssdev); taal_cancel_ulps_work(dssdev); taal_queue_ulps_work(dssdev); return 0; } static int taal_bl_update_status(struct backlight_device *dev) { struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); int r; int level; if (dev->props.fb_blank == FB_BLANK_UNBLANK && dev->props.power == FB_BLANK_UNBLANK) level = dev->props.brightness; else level = 0; dev_dbg(&dssdev->dev, "update brightness to %d\n", level); mutex_lock(&td->lock); if (td->use_dsi_bl) { if (td->enabled) { dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (!r) r = taal_dcs_write_1(td, DCS_BRIGHTNESS, level); dsi_bus_unlock(dssdev); } else { r = 0; } } else { if (!panel_data->set_backlight) r = -EINVAL; else r = panel_data->set_backlight(dssdev, level); } mutex_unlock(&td->lock); return r; } static int taal_bl_get_intensity(struct backlight_device *dev) { if (dev->props.fb_blank == FB_BLANK_UNBLANK && dev->props.power == FB_BLANK_UNBLANK) return dev->props.brightness; return 0; } static const struct backlight_ops taal_bl_ops = { .get_brightness = taal_bl_get_intensity, .update_status = taal_bl_update_status, }; static void taal_get_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { *timings = dssdev->panel.timings; } static void taal_get_resolution(struct omap_dss_device *dssdev, u16 *xres, u16 *yres) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); if (td->rotate == 0 || td->rotate == 2) { *xres = dssdev->panel.timings.x_res; *yres = dssdev->panel.timings.y_res; } else { *yres = dssdev->panel.timings.x_res; *xres = dssdev->panel.timings.y_res; } } static ssize_t taal_num_errors_show(struct device *dev, struct device_attribute *attr, char *buf) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); u8 errors; int r; mutex_lock(&td->lock); if (td->enabled) { dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (!r) r = taal_dcs_read_1(td, DCS_READ_NUM_ERRORS, &errors); dsi_bus_unlock(dssdev); } else { r = -ENODEV; } mutex_unlock(&td->lock); if (r) return r; return snprintf(buf, PAGE_SIZE, "%d\n", errors); } static ssize_t taal_hw_revision_show(struct device *dev, struct device_attribute *attr, char *buf) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); u8 id1, id2, id3; int r; mutex_lock(&td->lock); if (td->enabled) { dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (!r) r = taal_get_id(td, &id1, &id2, &id3); dsi_bus_unlock(dssdev); } else { r = -ENODEV; } mutex_unlock(&td->lock); if (r) return r; return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3); } static const char *cabc_modes[] = { "off", /* used also always 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 omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); const char *mode_str; int mode; int len; mode = td->cabc_mode; 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 omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); int i; int r; for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) { if (sysfs_streq(cabc_modes[i], buf)) break; } if (i == ARRAY_SIZE(cabc_modes)) return -EINVAL; mutex_lock(&td->lock); if (td->enabled) { dsi_bus_lock(dssdev); if (!td->cabc_broken) { r = taal_wake_up(dssdev); if (r) goto err; r = taal_dcs_write_1(td, DCS_WRITE_CABC, i); if (r) goto err; } dsi_bus_unlock(dssdev); } td->cabc_mode = i; mutex_unlock(&td->lock); return count; err: dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return r; } static ssize_t show_cabc_available_modes(struct device *dev, struct device_attribute *attr, char *buf) { int len; int i; 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 ssize_t taal_store_esd_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned long t; int r; r = strict_strtoul(buf, 10, &t); if (r) return r; mutex_lock(&td->lock); taal_cancel_esd_work(dssdev); td->esd_interval = t; if (td->enabled) taal_queue_esd_work(dssdev); mutex_unlock(&td->lock); return count; } static ssize_t taal_show_esd_interval(struct device *dev, struct device_attribute *attr, char *buf) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned t; mutex_lock(&td->lock); t = td->esd_interval; mutex_unlock(&td->lock); return snprintf(buf, PAGE_SIZE, "%u\n", t); } static ssize_t taal_store_ulps(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned long t; int r; r = strict_strtoul(buf, 10, &t); if (r) return r; mutex_lock(&td->lock); if (td->enabled) { dsi_bus_lock(dssdev); if (t) r = taal_enter_ulps(dssdev); else r = taal_wake_up(dssdev); dsi_bus_unlock(dssdev); } mutex_unlock(&td->lock); if (r) return r; return count; } static ssize_t taal_show_ulps(struct device *dev, struct device_attribute *attr, char *buf) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned t; mutex_lock(&td->lock); t = td->ulps_enabled; mutex_unlock(&td->lock); return snprintf(buf, PAGE_SIZE, "%u\n", t); } static ssize_t taal_store_ulps_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned long t; int r; r = strict_strtoul(buf, 10, &t); if (r) return r; mutex_lock(&td->lock); td->ulps_timeout = t; if (td->enabled) { /* taal_wake_up will restart the timer */ dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); dsi_bus_unlock(dssdev); } mutex_unlock(&td->lock); if (r) return r; return count; } static ssize_t taal_show_ulps_timeout(struct device *dev, struct device_attribute *attr, char *buf) { struct omap_dss_device *dssdev = to_dss_device(dev); struct taal_data *td = dev_get_drvdata(&dssdev->dev); unsigned t; mutex_lock(&td->lock); t = td->ulps_timeout; mutex_unlock(&td->lock); return snprintf(buf, PAGE_SIZE, "%u\n", t); } static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL); static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL); 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 DEVICE_ATTR(esd_interval, S_IRUGO | S_IWUSR, taal_show_esd_interval, taal_store_esd_interval); static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR, taal_show_ulps, taal_store_ulps); static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR, taal_show_ulps_timeout, taal_store_ulps_timeout); static struct attribute *taal_attrs[] = { &dev_attr_num_dsi_errors.attr, &dev_attr_hw_revision.attr, &dev_attr_cabc_mode.attr, &dev_attr_cabc_available_modes.attr, &dev_attr_esd_interval.attr, &dev_attr_ulps.attr, &dev_attr_ulps_timeout.attr, NULL, }; static struct attribute_group taal_attr_group = { .attrs = taal_attrs, }; static void taal_hw_reset(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); if (panel_data->reset_gpio == -1) return; gpio_set_value(panel_data->reset_gpio, 1); if (td->panel_config->reset_sequence.high) udelay(td->panel_config->reset_sequence.high); /* reset the panel */ gpio_set_value(panel_data->reset_gpio, 0); /* assert reset */ if (td->panel_config->reset_sequence.low) udelay(td->panel_config->reset_sequence.low); gpio_set_value(panel_data->reset_gpio, 1); /* wait after releasing reset */ if (td->panel_config->sleep.hw_reset) msleep(td->panel_config->sleep.hw_reset); } static int taal_probe(struct omap_dss_device *dssdev) { struct backlight_properties props; struct taal_data *td; struct backlight_device *bldev; struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); struct panel_config *panel_config = NULL; int r, i; dev_dbg(&dssdev->dev, "probe\n"); if (!panel_data || !panel_data->name) { r = -EINVAL; goto err; } for (i = 0; i < ARRAY_SIZE(panel_configs); i++) { if (strcmp(panel_data->name, panel_configs[i].name) == 0) { panel_config = &panel_configs[i]; break; } } if (!panel_config) { r = -EINVAL; goto err; } dssdev->panel.config = OMAP_DSS_LCD_TFT; dssdev->panel.timings = panel_config->timings; dssdev->ctrl.pixel_size = 24; td = kzalloc(sizeof(*td), GFP_KERNEL); if (!td) { r = -ENOMEM; goto err; } td->dssdev = dssdev; td->panel_config = panel_config; td->esd_interval = panel_data->esd_interval; td->ulps_enabled = false; td->ulps_timeout = panel_data->ulps_timeout; mutex_init(&td->lock); atomic_set(&td->do_update, 0); r = init_regulators(dssdev, panel_config->regulators, panel_config->num_regulators); if (r) goto err_reg; td->workqueue = create_singlethread_workqueue("taal_esd"); if (td->workqueue == NULL) { dev_err(&dssdev->dev, "can't create ESD workqueue\n"); r = -ENOMEM; goto err_wq; } INIT_DELAYED_WORK_DEFERRABLE(&td->esd_work, taal_esd_work); INIT_DELAYED_WORK(&td->ulps_work, taal_ulps_work); dev_set_drvdata(&dssdev->dev, td); taal_hw_reset(dssdev); /* if no platform set_backlight() defined, presume DSI backlight * control */ memset(&props, 0, sizeof(struct backlight_properties)); if (!panel_data->set_backlight) td->use_dsi_bl = true; if (td->use_dsi_bl) props.max_brightness = 255; else props.max_brightness = 127; props.type = BACKLIGHT_RAW; bldev = backlight_device_register(dev_name(&dssdev->dev), &dssdev->dev, dssdev, &taal_bl_ops, &props); if (IS_ERR(bldev)) { r = PTR_ERR(bldev); goto err_bl; } td->bldev = bldev; bldev->props.fb_blank = FB_BLANK_UNBLANK; bldev->props.power = FB_BLANK_UNBLANK; if (td->use_dsi_bl) bldev->props.brightness = 255; else bldev->props.brightness = 127; taal_bl_update_status(bldev); if (panel_data->use_ext_te) { int gpio = panel_data->ext_te_gpio; r = gpio_request(gpio, "taal irq"); if (r) { dev_err(&dssdev->dev, "GPIO request failed\n"); goto err_gpio; } gpio_direction_input(gpio); r = request_irq(gpio_to_irq(gpio), taal_te_isr, IRQF_TRIGGER_RISING, "taal vsync", dssdev); if (r) { dev_err(&dssdev->dev, "IRQ request failed\n"); gpio_free(gpio); goto err_irq; } INIT_DELAYED_WORK_DEFERRABLE(&td->te_timeout_work, taal_te_timeout_work_callback); dev_dbg(&dssdev->dev, "Using GPIO TE\n"); } r = omap_dsi_request_vc(dssdev, &td->channel); if (r) { dev_err(&dssdev->dev, "failed to get virtual channel\n"); goto err_req_vc; } r = omap_dsi_set_vc_id(dssdev, td->channel, TCH); if (r) { dev_err(&dssdev->dev, "failed to set VC_ID\n"); goto err_vc_id; } r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group); if (r) { dev_err(&dssdev->dev, "failed to create sysfs files\n"); goto err_vc_id; } return 0; err_vc_id: omap_dsi_release_vc(dssdev, td->channel); err_req_vc: if (panel_data->use_ext_te) free_irq(gpio_to_irq(panel_data->ext_te_gpio), dssdev); err_irq: if (panel_data->use_ext_te) gpio_free(panel_data->ext_te_gpio); err_gpio: backlight_device_unregister(bldev); err_bl: destroy_workqueue(td->workqueue); err_wq: free_regulators(panel_config->regulators, panel_config->num_regulators); err_reg: kfree(td); err: return r; } static void __exit taal_remove(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); struct backlight_device *bldev; dev_dbg(&dssdev->dev, "remove\n"); sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group); omap_dsi_release_vc(dssdev, td->channel); if (panel_data->use_ext_te) { int gpio = panel_data->ext_te_gpio; free_irq(gpio_to_irq(gpio), dssdev); gpio_free(gpio); } bldev = td->bldev; bldev->props.power = FB_BLANK_POWERDOWN; taal_bl_update_status(bldev); backlight_device_unregister(bldev); taal_cancel_ulps_work(dssdev); taal_cancel_esd_work(dssdev); destroy_workqueue(td->workqueue); /* reset, to be sure that the panel is in a valid state */ taal_hw_reset(dssdev); free_regulators(td->panel_config->regulators, td->panel_config->num_regulators); kfree(td); } static int taal_power_on(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); u8 id1, id2, id3; int r; r = omapdss_dsi_display_enable(dssdev); if (r) { dev_err(&dssdev->dev, "failed to enable DSI\n"); goto err0; } taal_hw_reset(dssdev); omapdss_dsi_vc_enable_hs(dssdev, td->channel, false); r = taal_sleep_out(td); if (r) goto err; r = taal_get_id(td, &id1, &id2, &id3); if (r) goto err; /* on early Taal revisions CABC is broken */ if (td->panel_config->type == PANEL_TAAL && (id2 == 0x00 || id2 == 0xff || id2 == 0x81)) td->cabc_broken = true; r = taal_dcs_write_1(td, DCS_BRIGHTNESS, 0xff); if (r) goto err; r = taal_dcs_write_1(td, DCS_CTRL_DISPLAY, (1<<2) | (1<<5)); /* BL | BCTRL */ if (r) goto err; r = taal_dcs_write_1(td, DCS_PIXEL_FORMAT, 0x7); /* 24bit/pixel */ if (r) goto err; r = taal_set_addr_mode(td, td->rotate, td->mirror); if (r) goto err; if (!td->cabc_broken) { r = taal_dcs_write_1(td, DCS_WRITE_CABC, td->cabc_mode); if (r) goto err; } r = taal_dcs_write_0(td, DCS_DISPLAY_ON); if (r) goto err; r = _taal_enable_te(dssdev, td->te_enabled); if (r) goto err; td->enabled = 1; if (!td->intro_printed) { dev_info(&dssdev->dev, "%s panel revision %02x.%02x.%02x\n", td->panel_config->name, id1, id2, id3); if (td->cabc_broken) dev_info(&dssdev->dev, "old Taal version, CABC disabled\n"); td->intro_printed = true; } omapdss_dsi_vc_enable_hs(dssdev, td->channel, true); return 0; err: dev_err(&dssdev->dev, "error while enabling panel, issuing HW reset\n"); taal_hw_reset(dssdev); omapdss_dsi_display_disable(dssdev, true, false); err0: return r; } static void taal_power_off(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; r = taal_dcs_write_0(td, DCS_DISPLAY_OFF); if (!r) r = taal_sleep_in(td); if (r) { dev_err(&dssdev->dev, "error disabling panel, issuing HW reset\n"); taal_hw_reset(dssdev); } omapdss_dsi_display_disable(dssdev, true, false); td->enabled = 0; } static int taal_panel_reset(struct omap_dss_device *dssdev) { dev_err(&dssdev->dev, "performing LCD reset\n"); taal_power_off(dssdev); taal_hw_reset(dssdev); return taal_power_on(dssdev); } static int taal_enable(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; dev_dbg(&dssdev->dev, "enable\n"); mutex_lock(&td->lock); if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) { r = -EINVAL; goto err; } dsi_bus_lock(dssdev); r = taal_power_on(dssdev); dsi_bus_unlock(dssdev); if (r) goto err; taal_queue_esd_work(dssdev); dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; mutex_unlock(&td->lock); return 0; err: dev_dbg(&dssdev->dev, "enable failed\n"); mutex_unlock(&td->lock); return r; } static void taal_disable(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); dev_dbg(&dssdev->dev, "disable\n"); mutex_lock(&td->lock); taal_cancel_ulps_work(dssdev); taal_cancel_esd_work(dssdev); dsi_bus_lock(dssdev); if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) { int r; r = taal_wake_up(dssdev); if (!r) taal_power_off(dssdev); } dsi_bus_unlock(dssdev); dssdev->state = OMAP_DSS_DISPLAY_DISABLED; mutex_unlock(&td->lock); } static int taal_suspend(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; dev_dbg(&dssdev->dev, "suspend\n"); mutex_lock(&td->lock); if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) { r = -EINVAL; goto err; } taal_cancel_ulps_work(dssdev); taal_cancel_esd_work(dssdev); dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (!r) taal_power_off(dssdev); dsi_bus_unlock(dssdev); dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED; mutex_unlock(&td->lock); return 0; err: mutex_unlock(&td->lock); return r; } static int taal_resume(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; dev_dbg(&dssdev->dev, "resume\n"); mutex_lock(&td->lock); if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) { r = -EINVAL; goto err; } dsi_bus_lock(dssdev); r = taal_power_on(dssdev); dsi_bus_unlock(dssdev); if (r) { dssdev->state = OMAP_DSS_DISPLAY_DISABLED; } else { dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; taal_queue_esd_work(dssdev); } mutex_unlock(&td->lock); return r; err: mutex_unlock(&td->lock); return r; } static void taal_framedone_cb(int err, void *data) { struct omap_dss_device *dssdev = data; dev_dbg(&dssdev->dev, "framedone, err %d\n", err); dsi_bus_unlock(dssdev); } static irqreturn_t taal_te_isr(int irq, void *data) { struct omap_dss_device *dssdev = data; struct taal_data *td = dev_get_drvdata(&dssdev->dev); int old; int r; old = atomic_cmpxchg(&td->do_update, 1, 0); if (old) { cancel_delayed_work(&td->te_timeout_work); r = omap_dsi_update(dssdev, td->channel, td->update_region.x, td->update_region.y, td->update_region.w, td->update_region.h, taal_framedone_cb, dssdev); if (r) goto err; } return IRQ_HANDLED; err: dev_err(&dssdev->dev, "start update failed\n"); dsi_bus_unlock(dssdev); return IRQ_HANDLED; } static void taal_te_timeout_work_callback(struct work_struct *work) { struct taal_data *td = container_of(work, struct taal_data, te_timeout_work.work); struct omap_dss_device *dssdev = td->dssdev; dev_err(&dssdev->dev, "TE not received for 250ms!\n"); atomic_set(&td->do_update, 0); dsi_bus_unlock(dssdev); } static int taal_update(struct omap_dss_device *dssdev, u16 x, u16 y, u16 w, u16 h) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); int r; dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h); mutex_lock(&td->lock); dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (r) goto err; if (!td->enabled) { r = 0; goto err; } r = omap_dsi_prepare_update(dssdev, &x, &y, &w, &h, true); if (r) goto err; r = taal_set_update_window(td, x, y, w, h); if (r) goto err; if (td->te_enabled && panel_data->use_ext_te) { td->update_region.x = x; td->update_region.y = y; td->update_region.w = w; td->update_region.h = h; barrier(); schedule_delayed_work(&td->te_timeout_work, msecs_to_jiffies(250)); atomic_set(&td->do_update, 1); } else { r = omap_dsi_update(dssdev, td->channel, x, y, w, h, taal_framedone_cb, dssdev); if (r) goto err; } /* note: no bus_unlock here. unlock is in framedone_cb */ mutex_unlock(&td->lock); return 0; err: dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return r; } static int taal_sync(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); dev_dbg(&dssdev->dev, "sync\n"); mutex_lock(&td->lock); dsi_bus_lock(dssdev); dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); dev_dbg(&dssdev->dev, "sync done\n"); return 0; } static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); int r; if (enable) r = taal_dcs_write_1(td, DCS_TEAR_ON, 0); else r = taal_dcs_write_0(td, DCS_TEAR_OFF); if (!panel_data->use_ext_te) omapdss_dsi_enable_te(dssdev, enable); if (td->panel_config->sleep.enable_te) msleep(td->panel_config->sleep.enable_te); return r; } static int taal_enable_te(struct omap_dss_device *dssdev, bool enable) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; mutex_lock(&td->lock); if (td->te_enabled == enable) goto end; dsi_bus_lock(dssdev); if (td->enabled) { r = taal_wake_up(dssdev); if (r) goto err; r = _taal_enable_te(dssdev, enable); if (r) goto err; } td->te_enabled = enable; dsi_bus_unlock(dssdev); end: mutex_unlock(&td->lock); return 0; err: dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return r; } static int taal_get_te(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; mutex_lock(&td->lock); r = td->te_enabled; mutex_unlock(&td->lock); return r; } static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; dev_dbg(&dssdev->dev, "rotate %d\n", rotate); mutex_lock(&td->lock); if (td->rotate == rotate) goto end; dsi_bus_lock(dssdev); if (td->enabled) { r = taal_wake_up(dssdev); if (r) goto err; r = taal_set_addr_mode(td, rotate, td->mirror); if (r) goto err; } td->rotate = rotate; dsi_bus_unlock(dssdev); end: mutex_unlock(&td->lock); return 0; err: dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return r; } static u8 taal_get_rotate(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; mutex_lock(&td->lock); r = td->rotate; mutex_unlock(&td->lock); return r; } static int taal_mirror(struct omap_dss_device *dssdev, bool enable) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; dev_dbg(&dssdev->dev, "mirror %d\n", enable); mutex_lock(&td->lock); if (td->mirror == enable) goto end; dsi_bus_lock(dssdev); if (td->enabled) { r = taal_wake_up(dssdev); if (r) goto err; r = taal_set_addr_mode(td, td->rotate, enable); if (r) goto err; } td->mirror = enable; dsi_bus_unlock(dssdev); end: mutex_unlock(&td->lock); return 0; err: dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return r; } static bool taal_get_mirror(struct omap_dss_device *dssdev) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); int r; mutex_lock(&td->lock); r = td->mirror; mutex_unlock(&td->lock); return r; } static int taal_run_test(struct omap_dss_device *dssdev, int test_num) { struct taal_data *td = dev_get_drvdata(&dssdev->dev); u8 id1, id2, id3; int r; mutex_lock(&td->lock); if (!td->enabled) { r = -ENODEV; goto err1; } dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (r) goto err2; r = taal_dcs_read_1(td, DCS_GET_ID1, &id1); if (r) goto err2; r = taal_dcs_read_1(td, DCS_GET_ID2, &id2); if (r) goto err2; r = taal_dcs_read_1(td, DCS_GET_ID3, &id3); if (r) goto err2; dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); return 0; err2: dsi_bus_unlock(dssdev); err1: mutex_unlock(&td->lock); return r; } static int taal_memory_read(struct omap_dss_device *dssdev, void *buf, size_t size, u16 x, u16 y, u16 w, u16 h) { int r; int first = 1; int plen; unsigned buf_used = 0; struct taal_data *td = dev_get_drvdata(&dssdev->dev); if (size < w * h * 3) return -ENOMEM; mutex_lock(&td->lock); if (!td->enabled) { r = -ENODEV; goto err1; } size = min(w * h * 3, dssdev->panel.timings.x_res * dssdev->panel.timings.y_res * 3); dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (r) goto err2; /* plen 1 or 2 goes into short packet. until checksum error is fixed, * use short packets. plen 32 works, but bigger packets seem to cause * an error. */ if (size % 2) plen = 1; else plen = 2; taal_set_update_window(td, x, y, w, h); r = dsi_vc_set_max_rx_packet_size(dssdev, td->channel, plen); if (r) goto err2; while (buf_used < size) { u8 dcs_cmd = first ? 0x2e : 0x3e; first = 0; r = dsi_vc_dcs_read(dssdev, td->channel, dcs_cmd, buf + buf_used, size - buf_used); if (r < 0) { dev_err(&dssdev->dev, "read error\n"); goto err3; } buf_used += r; if (r < plen) { dev_err(&dssdev->dev, "short read\n"); break; } if (signal_pending(current)) { dev_err(&dssdev->dev, "signal pending, " "aborting memory read\n"); r = -ERESTARTSYS; goto err3; } } r = buf_used; err3: dsi_vc_set_max_rx_packet_size(dssdev, td->channel, 1); err2: dsi_bus_unlock(dssdev); err1: mutex_unlock(&td->lock); return r; } static void taal_ulps_work(struct work_struct *work) { struct taal_data *td = container_of(work, struct taal_data, ulps_work.work); struct omap_dss_device *dssdev = td->dssdev; mutex_lock(&td->lock); if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !td->enabled) { mutex_unlock(&td->lock); return; } dsi_bus_lock(dssdev); taal_enter_ulps(dssdev); dsi_bus_unlock(dssdev); mutex_unlock(&td->lock); } static void taal_esd_work(struct work_struct *work) { struct taal_data *td = container_of(work, struct taal_data, esd_work.work); struct omap_dss_device *dssdev = td->dssdev; struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev); u8 state1, state2; int r; mutex_lock(&td->lock); if (!td->enabled) { mutex_unlock(&td->lock); return; } dsi_bus_lock(dssdev); r = taal_wake_up(dssdev); if (r) { dev_err(&dssdev->dev, "failed to exit ULPS\n"); goto err; } r = taal_dcs_read_1(td, DCS_RDDSDR, &state1); if (r) { dev_err(&dssdev->dev, "failed to read Taal status\n"); goto err; } /* Run self diagnostics */ r = taal_sleep_out(td); if (r) { dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n"); goto err; } r = taal_dcs_read_1(td, DCS_RDDSDR, &state2); if (r) { dev_err(&dssdev->dev, "failed to read Taal status\n"); goto err; } /* Each sleep out command will trigger a self diagnostic and flip * Bit6 if the test passes. */ if (!((state1 ^ state2) & (1 << 6))) { dev_err(&dssdev->dev, "LCD self diagnostics failed\n"); goto err; } /* Self-diagnostics result is also shown on TE GPIO line. We need * to re-enable TE after self diagnostics */ if (td->te_enabled && panel_data->use_ext_te) { r = taal_dcs_write_1(td, DCS_TEAR_ON, 0); if (r) goto err; } dsi_bus_unlock(dssdev); taal_queue_esd_work(dssdev); mutex_unlock(&td->lock); return; err: dev_err(&dssdev->dev, "performing LCD reset\n"); taal_panel_reset(dssdev); dsi_bus_unlock(dssdev); taal_queue_esd_work(dssdev); mutex_unlock(&td->lock); } static struct omap_dss_driver taal_driver = { .probe = taal_probe, .remove = __exit_p(taal_remove), .enable = taal_enable, .disable = taal_disable, .suspend = taal_suspend, .resume = taal_resume, .update = taal_update, .sync = taal_sync, .get_resolution = taal_get_resolution, .get_recommended_bpp = omapdss_default_get_recommended_bpp, .enable_te = taal_enable_te, .get_te = taal_get_te, .set_rotate = taal_rotate, .get_rotate = taal_get_rotate, .set_mirror = taal_mirror, .get_mirror = taal_get_mirror, .run_test = taal_run_test, .memory_read = taal_memory_read, .get_timings = taal_get_timings, .driver = { .name = "taal", .owner = THIS_MODULE, }, }; static int __init taal_init(void) { omap_dss_register_driver(&taal_driver); return 0; } static void __exit taal_exit(void) { omap_dss_unregister_driver(&taal_driver); } module_init(taal_init); module_exit(taal_exit); MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>"); MODULE_DESCRIPTION("Taal Driver"); MODULE_LICENSE("GPL");