From c59eef17f1cc21a984cf077ad45a8355781881b6 Mon Sep 17 00:00:00 2001 From: Andres Salomon Date: Thu, 10 Feb 2011 17:56:27 -0800 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/staging/olpc_dcon/olpc_dcon.c | 113 ++++++++++---------------- drivers/staging/olpc_dcon/olpc_dcon.h | 4 + 2 files changed, 47 insertions(+), 70 deletions(-) diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c b/drivers/staging/olpc_dcon/olpc_dcon.c index 07abdfa4ad48..b90c2cf3e247 100644 --- a/drivers/staging/olpc_dcon/olpc_dcon.c +++ b/drivers/staging/olpc_dcon/olpc_dcon.c @@ -50,9 +50,6 @@ static struct dcon_platform_data *pdata; /* Platform devices */ static struct platform_device *dcon_device; -/* Backlight device */ -static struct backlight_device *dcon_bl_dev; - static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; @@ -67,9 +64,6 @@ static s32 dcon_read(struct dcon_priv *dcon, u8 reg) return i2c_smbus_read_word_data(dcon->client, reg); } -/* The current backlight value - this saves us some smbus traffic */ -static int bl_val = -1; - /* ===== API functions - these are called by a variety of users ==== */ static int dcon_hw_init(struct dcon_priv *dcon, int is_init) @@ -185,25 +179,13 @@ power_up: return 0; } -static int dcon_get_backlight(struct dcon_priv *dcon) +static void dcon_set_backlight(struct dcon_priv *dcon, u8 level) { - if (!dcon || !dcon->client) - return 0; - - if (bl_val == -1) - bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; - - return bl_val; -} - - -static void dcon_set_backlight_hw(struct dcon_priv *dcon, int level) -{ - bl_val = level & 0x0F; - dcon_write(dcon, DCON_REG_BRIGHT, bl_val); + dcon->bl_val = level; + dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val); /* Purposely turn off the backlight when we go to level 0 */ - if (bl_val == 0) { + if (dcon->bl_val == 0) { dcon->disp_mode &= ~MODE_BL_ENABLE; dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) { @@ -212,17 +194,6 @@ static void dcon_set_backlight_hw(struct dcon_priv *dcon, int level) } } -static void dcon_set_backlight(struct dcon_priv *dcon, int level) -{ - if (!dcon || !dcon->client) - return; - - if (bl_val == (level & 0x0F)) - return; - - dcon_set_backlight_hw(dcon, level); -} - /* Set the output type to either color or mono */ static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) { @@ -271,7 +242,7 @@ static void dcon_sleep(struct dcon_priv *dcon, bool sleep) dcon->asleep = sleep; } else { /* Only re-enable the backlight if the backlight value is set */ - if (bl_val != 0) + if (dcon->bl_val != 0) dcon->disp_mode |= MODE_BL_ENABLE; x = dcon_bus_stabilize(dcon, 1); if (x) @@ -281,7 +252,7 @@ static void dcon_sleep(struct dcon_priv *dcon, bool sleep) dcon->asleep = sleep; /* Restore backlight */ - dcon_set_backlight_hw(dcon, bl_val); + dcon_set_backlight(dcon, dcon->bl_val); } /* We should turn off some stuff in the framebuffer - but what? */ @@ -458,24 +429,6 @@ static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) flush_scheduled_work(); } -static int dconbl_set(struct backlight_device *dev) -{ - struct dcon_priv *dcon = bl_get_data(dev); - int level = dev->props.brightness; - - if (dev->props.power != FB_BLANK_UNBLANK) - level = 0; - - dcon_set_backlight(dcon, level); - return 0; -} - -static int dconbl_get(struct backlight_device *dev) -{ - struct dcon_priv *dcon = bl_get_data(dev); - return dcon_get_backlight(dcon); -} - static ssize_t dcon_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -594,11 +547,35 @@ static struct device_attribute dcon_device_files[] = { __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), }; +static int dcon_bl_update(struct backlight_device *dev) +{ + struct dcon_priv *dcon = bl_get_data(dev); + u8 level = dev->props.brightness & 0x0F; + + if (dev->props.power != FB_BLANK_UNBLANK) + level = 0; + + if (level != dcon->bl_val) + dcon_set_backlight(dcon, level); + + return 0; +} + +static int dcon_bl_get(struct backlight_device *dev) +{ + struct dcon_priv *dcon = bl_get_data(dev); + return dcon->bl_val; +} + static const struct backlight_ops dcon_bl_ops = { - .get_brightness = dconbl_get, - .update_status = dconbl_set + .update_status = dcon_bl_update, + .get_brightness = dcon_bl_get, }; +static struct backlight_properties dcon_bl_props = { + .max_brightness = 15, + .power = FB_BLANK_UNBLANK, +}; static int dcon_reboot_notify(struct notifier_block *nb, unsigned long foo, void *bar) @@ -707,20 +684,16 @@ static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) } } + dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; + /* Add the backlight device for the DCON */ - dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, - dcon, &dcon_bl_ops, NULL); - - if (IS_ERR(dcon_bl_dev)) { - printk(KERN_ERR "Cannot register the backlight device (%ld)\n", - PTR_ERR(dcon_bl_dev)); - dcon_bl_dev = NULL; - } else { - dcon_bl_dev->props.max_brightness = 15; - dcon_bl_dev->props.power = FB_BLANK_UNBLANK; - dcon_bl_dev->props.brightness = dcon_get_backlight(dcon); - - backlight_update_status(dcon_bl_dev); + dcon_bl_props.brightness = dcon->bl_val; + dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, + dcon, &dcon_bl_ops, &dcon_bl_props); + if (IS_ERR(dcon->bl_dev)) { + dev_err(&client->dev, "cannot register backlight dev (%ld)\n", + PTR_ERR(dcon->bl_dev)); + dcon->bl_dev = NULL; } register_reboot_notifier(&dcon->reboot_nb); @@ -755,8 +728,8 @@ static int dcon_remove(struct i2c_client *client) free_irq(DCON_IRQ, dcon); - if (dcon_bl_dev != NULL) - backlight_device_unregister(dcon_bl_dev); + if (dcon->bl_dev) + backlight_device_unregister(dcon->bl_dev); if (dcon_device != NULL) platform_device_unregister(dcon_device); diff --git a/drivers/staging/olpc_dcon/olpc_dcon.h b/drivers/staging/olpc_dcon/olpc_dcon.h index 62bed461d582..0264c94375aa 100644 --- a/drivers/staging/olpc_dcon/olpc_dcon.h +++ b/drivers/staging/olpc_dcon/olpc_dcon.h @@ -50,6 +50,7 @@ struct dcon_priv { struct i2c_client *client; struct fb_info *fbinfo; + struct backlight_device *bl_dev; struct work_struct switch_source; struct notifier_block reboot_nb; @@ -58,6 +59,9 @@ struct dcon_priv { /* Shadow register for the DCON_REG_MODE register */ u8 disp_mode; + /* The current backlight value - this saves us some smbus traffic */ + u8 bl_val; + /* Current source, initialized at probe time */ int curr_src;