On Wed, 2008-02-06 at 17:33 +0100, Kristoffer Ericson wrote:
> Oki, here is attempt #2 (btw, new mail or just keep thread?)
Apart from the issues Russell mentioned,
--- /dev/null
+++ b/drivers/video/backlight/jornada720_bllcd.c
@@ -0,0 +1,286 @@
+/*
+ * drivers/video/backlight/jornada720_bllcd.c
+ *
We already know which file this is...
> +/*
> + * BACKLIGHT HANDLING ROUTINES
> + */
> +static int jornada_bl_get_brightness(struct backlight_device *dev)
> +{
> + int ret;
> +
> + /* check if backlight is on */
> + if (!(PPSR & PPC_LDD1))
> + return JORNADA_BL_MAX_BRIGHTNESS;
> +
> + jornada_ssp_start();
> + if (jornada_ssp_inout(GETBRIGHTNESS) == -ETIMEDOUT) {
> + printk(KERN_ERR "jornada720_bl: GetBrightness failed\n");
> + ret = JORNADA_BL_MAX_BRIGHTNESS + 1;
You've informed the backlight class your brightness runs from 0 to
JORNADA_BL_MAX_BRIGHTNESS by setting max_brightness. Returning
JORNADA_BL_MAX_BRIGHTNESS + 1 is invalid and confusing. -1 would
probably be a better choice.
> +static int jornada_lcd_get_contrast(struct lcd_device *pdev)
> +{
> + int ret;
> +
> + /* Don't set contrast on off powerd LCD */
> + if (jornada_lcd_get_power(pdev) != FB_BLANK_UNBLANK)
> + return 0;
> +
> + jornada_ssp_start();
> +
> + ret = jornada_ssp_inout(GETCONTRAST);
> + if (ret != -ETIMEDOUT)
> + ret = jornada_ssp_inout(TXDUMMY);
> + else {
> + printk(KERN_ERR "jornada_lcd: getcontrast failed!\n");
> + ret = JORNADA_BL_MAX_BRIGHTNESS + 1;
and again...
> +static int jornada_bl_probe(struct platform_device *pdev)
> +{
> + struct jornada_bllcd_device *bllcd;
> +
> + bllcd = kzalloc(sizeof(*bllcd), GFP_KERNEL);
> + if (bllcd == NULL)
> + return -ENOMEM;
> +
> + /* bl driver - name must match fb driver name */
> + bllcd->jorn_backlight_device = backlight_device_register(S1D_DEVICENAME,
> + &pdev->dev, NULL, &jornada_bl_ops);
> +
> + if (IS_ERR(bllcd->jorn_backlight_device)) {
> + kfree(bllcd);
> + return PTR_ERR(bllcd->jorn_backlight_device);
> + }
> +
> + /* lcd driver */
> + bllcd->jorn_lcd_device = lcd_device_register(S1D_DEVICENAME,
> + &pdev->dev, NULL, &jornada_lcd_ops);
> + if (IS_ERR(bllcd->jorn_lcd_device)) {
> + kfree(bllcd);
> + return PTR_ERR(bllcd->jorn_lcd_device);
> + }
Please go over these error paths carefully, there are several problems
there...
> + jornada_lcd_set_contrast(bllcd->jorn_lcd_device,
> + JORNADA_LCD_DEFAULT_CONTRAST);
> + jornada_lcd_set_power(bllcd->jorn_lcd_device,
> + FB_BLANK_UNBLANK);
> +
> + msleep(100);
Why is this msleep needed? If it is needed, how does the driver manage
to suspend/resume?
Richard
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