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Subject[PATCH 09/15] Platform: OLPC: add a regulator for the DCON
Date
All OLPC ECs are able to turn the power to the DCON on an off. Use the
regulator framework to expose the functionality.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
drivers/platform/olpc/Kconfig | 1 +
drivers/platform/olpc/olpc-ec.c | 65 +++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)

diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
index 7c643d24ad0f..c5a872fb286f 100644
--- a/drivers/platform/olpc/Kconfig
+++ b/drivers/platform/olpc/Kconfig
@@ -6,6 +6,7 @@ config OLPC
select OF
select OF_PROMTREE if X86
select IRQ_DOMAIN
+ select REGULATOR
help
Add support for detecting the unique features of the OLPC
XO hardware.
diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index b9d9a9897dd5..8f82922631a9 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -14,6 +14,7 @@
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/list.h>
+#include <linux/regulator/driver.h>
#include <linux/olpc-ec.h>

struct ec_cmd_desc {
@@ -34,6 +35,10 @@ struct olpc_ec_priv {
struct work_struct worker;
struct mutex cmd_lock;

+ /* DCON regulator */
+ struct regulator_dev *dcon_rdev;
+ bool dcon_enabled;
+
/* Pending EC commands */
struct list_head cmd_q;
spinlock_t cmd_q_lock;
@@ -347,9 +352,60 @@ static struct dentry *olpc_ec_setup_debugfs(void)

#endif /* CONFIG_DEBUG_FS */

+static int olpc_ec_set_dcon_power(struct olpc_ec_priv *ec, bool state)
+{
+ unsigned char ec_byte = state;
+ int ret;
+
+ if (ec->dcon_enabled == state)
+ return 0;
+
+ ret = olpc_ec_cmd(EC_DCON_POWER_MODE, &ec_byte, 1, NULL, 0);
+ if (ret == 0)
+ ec->dcon_enabled = state;
+
+ return ret;
+}
+
+static int dcon_regulator_enable(struct regulator_dev *rdev)
+{
+ struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+ return olpc_ec_set_dcon_power(ec, 1);
+}
+
+static int dcon_regulator_disable(struct regulator_dev *rdev)
+{
+ struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+ return olpc_ec_set_dcon_power(ec, 0);
+}
+
+static int dcon_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+ return ec->dcon_enabled;
+}
+
+static struct regulator_ops dcon_regulator_ops = {
+ .enable = dcon_regulator_enable,
+ .disable = dcon_regulator_disable,
+ .is_enabled = dcon_regulator_is_enabled,
+};
+
+static const struct regulator_desc dcon_desc = {
+ .name = "dcon",
+ .id = 0,
+ .ops = &dcon_regulator_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+};
+
static int olpc_ec_probe(struct platform_device *pdev)
{
struct olpc_ec_priv *ec;
+ struct regulator_config config = { };
int err;

if (!ec_driver)
@@ -378,6 +434,15 @@ static int olpc_ec_probe(struct platform_device *pdev)
return err;
}

+ config.dev = pdev->dev.parent;
+ config.driver_data = ec;
+ ec->dcon_enabled = true;
+ ec->dcon_rdev = devm_regulator_register(&pdev->dev, &dcon_desc, &config);
+ if (IS_ERR(ec->dcon_rdev)) {
+ dev_err(&pdev->dev, "failed to register DCON regulator\n");
+ return PTR_ERR(ec->dcon_rdev);
+ }
+
ec->dbgfs_dir = olpc_ec_setup_debugfs();

return err;
--
2.19.0
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