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authorTomi Valkeinen <tomi.valkeinen@nokia.com>2010-06-09 16:24:46 +0400
committerTomi Valkeinen <tomi.valkeinen@nokia.com>2010-08-03 16:18:49 +0400
commitc8cd4547dcb350331cf80f5729ee648d8120783e (patch)
treedf619859423dc15becec418836c9b0debe70c4ec /drivers/video
parent0f45bddf0420ace2ddb7c4faa11f139b42c6eea5 (diff)
downloadlinux-c8cd4547dcb350331cf80f5729ee648d8120783e.tar.xz
OMAP: DSS2: Taal: Add regulator configuration support
Add support for configuring regulators in the panel specific configuration data. Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/omap2/displays/panel-taal.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index cbe0214e2f05..941f1f208c9e 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -30,6 +30,7 @@
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
+#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <plat/display.h>
@@ -68,6 +69,73 @@ 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);
+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
@@ -75,6 +143,8 @@ static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);
* @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;
@@ -93,6 +163,9 @@ struct panel_config {
unsigned int high;
unsigned int low;
} reset_sequence;
+
+ struct panel_regulator *regulators;
+ int num_regulators;
};
enum {
@@ -629,6 +702,11 @@ static int taal_probe(struct omap_dss_device *dssdev)
atomic_set(&td->do_update, 0);
+ r = init_regulators(dssdev, panel_config->regulators,
+ panel_config->num_regulators);
+ if (r)
+ goto err_reg;
+
td->esd_wq = create_singlethread_workqueue("taal_esd");
if (td->esd_wq == NULL) {
dev_err(&dssdev->dev, "can't create ESD workqueue\n");
@@ -714,6 +792,8 @@ err_gpio:
err_bl:
destroy_workqueue(td->esd_wq);
err_wq:
+ free_regulators(panel_config->regulators, panel_config->num_regulators);
+err_reg:
kfree(td);
err:
return r;
@@ -746,6 +826,9 @@ static void taal_remove(struct omap_dss_device *dssdev)
/* 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);
}