mirror of https://gitee.com/openkylin/linux.git
staging: olpc_dcon: clean up backlight handling
- Move bl_val and bl_dev into dcon_priv struct.... - The only time we ever read the backlight val from the dcon is at probe time. Rather than calling dcon_get_backlight for that, just read from the register. - Drop dcon_get_backlight; it's just returning dcon->bl_val. - Rename dcon_set_backlight_hw to dcon_set_backlight, and drop the old dcon_set_backlight function. Move contents of old dcon_set_backlight function into dconbl_set. - Shuffle backlight_ops callbacks around to be closer to struct, and rename them. - Make use of new backlight_properties arg to backlight_device_register, drop old code that set this manually. Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andres Salomon
Greg Kroah-Hartman
parent
309ef2a25e
commit
c59eef17f1
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@ -50,9 +50,6 @@ static struct dcon_platform_data *pdata;
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/* Platform devices */
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static struct platform_device *dcon_device;
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/* Backlight device */
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static struct backlight_device *dcon_bl_dev;
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static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue);
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static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
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@ -67,9 +64,6 @@ static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
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return i2c_smbus_read_word_data(dcon->client, reg);
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}
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/* The current backlight value - this saves us some smbus traffic */
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static int bl_val = -1;
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/* ===== API functions - these are called by a variety of users ==== */
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static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
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@ -185,25 +179,13 @@ static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
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return 0;
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}
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static int dcon_get_backlight(struct dcon_priv *dcon)
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static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
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{
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if (!dcon || !dcon->client)
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return 0;
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if (bl_val == -1)
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bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
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return bl_val;
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}
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static void dcon_set_backlight_hw(struct dcon_priv *dcon, int level)
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{
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bl_val = level & 0x0F;
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dcon_write(dcon, DCON_REG_BRIGHT, bl_val);
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dcon->bl_val = level;
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dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
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/* Purposely turn off the backlight when we go to level 0 */
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if (bl_val == 0) {
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if (dcon->bl_val == 0) {
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dcon->disp_mode &= ~MODE_BL_ENABLE;
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dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
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} else if (!(dcon->disp_mode & MODE_BL_ENABLE)) {
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@ -212,17 +194,6 @@ static void dcon_set_backlight_hw(struct dcon_priv *dcon, int level)
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}
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}
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static void dcon_set_backlight(struct dcon_priv *dcon, int level)
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{
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if (!dcon || !dcon->client)
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return;
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if (bl_val == (level & 0x0F))
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return;
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dcon_set_backlight_hw(dcon, level);
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}
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/* Set the output type to either color or mono */
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static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono)
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{
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@ -271,7 +242,7 @@ static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
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dcon->asleep = sleep;
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} else {
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/* Only re-enable the backlight if the backlight value is set */
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if (bl_val != 0)
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if (dcon->bl_val != 0)
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dcon->disp_mode |= MODE_BL_ENABLE;
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x = dcon_bus_stabilize(dcon, 1);
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if (x)
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@ -281,7 +252,7 @@ static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
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dcon->asleep = sleep;
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/* Restore backlight */
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dcon_set_backlight_hw(dcon, bl_val);
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dcon_set_backlight(dcon, dcon->bl_val);
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}
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/* We should turn off some stuff in the framebuffer - but what? */
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@ -458,24 +429,6 @@ static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
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flush_scheduled_work();
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}
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static int dconbl_set(struct backlight_device *dev)
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{
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struct dcon_priv *dcon = bl_get_data(dev);
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int level = dev->props.brightness;
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if (dev->props.power != FB_BLANK_UNBLANK)
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level = 0;
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dcon_set_backlight(dcon, level);
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return 0;
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}
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static int dconbl_get(struct backlight_device *dev)
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{
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struct dcon_priv *dcon = bl_get_data(dev);
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return dcon_get_backlight(dcon);
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}
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static ssize_t dcon_mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@ -594,11 +547,35 @@ static struct device_attribute dcon_device_files[] = {
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__ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
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};
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static int dcon_bl_update(struct backlight_device *dev)
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{
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struct dcon_priv *dcon = bl_get_data(dev);
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u8 level = dev->props.brightness & 0x0F;
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if (dev->props.power != FB_BLANK_UNBLANK)
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level = 0;
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if (level != dcon->bl_val)
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dcon_set_backlight(dcon, level);
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return 0;
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}
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static int dcon_bl_get(struct backlight_device *dev)
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{
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struct dcon_priv *dcon = bl_get_data(dev);
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return dcon->bl_val;
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}
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static const struct backlight_ops dcon_bl_ops = {
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.get_brightness = dconbl_get,
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.update_status = dconbl_set
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.update_status = dcon_bl_update,
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.get_brightness = dcon_bl_get,
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};
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static struct backlight_properties dcon_bl_props = {
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.max_brightness = 15,
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.power = FB_BLANK_UNBLANK,
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};
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static int dcon_reboot_notify(struct notifier_block *nb,
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unsigned long foo, void *bar)
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@ -707,20 +684,16 @@ static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id)
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}
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}
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dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
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/* Add the backlight device for the DCON */
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dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
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dcon, &dcon_bl_ops, NULL);
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if (IS_ERR(dcon_bl_dev)) {
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printk(KERN_ERR "Cannot register the backlight device (%ld)\n",
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PTR_ERR(dcon_bl_dev));
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dcon_bl_dev = NULL;
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} else {
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dcon_bl_dev->props.max_brightness = 15;
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dcon_bl_dev->props.power = FB_BLANK_UNBLANK;
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dcon_bl_dev->props.brightness = dcon_get_backlight(dcon);
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backlight_update_status(dcon_bl_dev);
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dcon_bl_props.brightness = dcon->bl_val;
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dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
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dcon, &dcon_bl_ops, &dcon_bl_props);
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if (IS_ERR(dcon->bl_dev)) {
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dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
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PTR_ERR(dcon->bl_dev));
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dcon->bl_dev = NULL;
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}
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register_reboot_notifier(&dcon->reboot_nb);
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@ -755,8 +728,8 @@ static int dcon_remove(struct i2c_client *client)
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free_irq(DCON_IRQ, dcon);
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if (dcon_bl_dev != NULL)
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backlight_device_unregister(dcon_bl_dev);
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if (dcon->bl_dev)
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backlight_device_unregister(dcon->bl_dev);
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if (dcon_device != NULL)
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platform_device_unregister(dcon_device);
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@ -50,6 +50,7 @@
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struct dcon_priv {
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struct i2c_client *client;
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struct fb_info *fbinfo;
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struct backlight_device *bl_dev;
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struct work_struct switch_source;
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struct notifier_block reboot_nb;
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@ -58,6 +59,9 @@ struct dcon_priv {
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/* Shadow register for the DCON_REG_MODE register */
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u8 disp_mode;
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/* The current backlight value - this saves us some smbus traffic */
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u8 bl_val;
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/* Current source, initialized at probe time */
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int curr_src;
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