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Platform: OLPC: Add a regulator for the DCON

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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>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Lubomir Rintel 2019-05-13 09:56:38 +02:00 • committed by Andy Shevchenko
parent 0c3d931b3a
commit 231c0c2161
2 changed files with 68 additions and 0 deletions
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1
drivers/platform/olpc/Kconfig
View file

@ -1,4 +1,5 @@
config OLPC_EC config OLPC_EC
select REGULATOR
bool bool
config OLPC_XO175_EC config OLPC_XO175_EC

67
drivers/platform/olpc/olpc-ec.c
View file

@ -16,6 +16,7 @@
#include <linux/workqueue.h> #include <linux/workqueue.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/regulator/driver.h>
#include <linux/olpc-ec.h> #include <linux/olpc-ec.h>
struct ec_cmd_desc { struct ec_cmd_desc {
@ -36,6 +37,10 @@ struct olpc_ec_priv {
struct work_struct worker; struct work_struct worker;
struct mutex cmd_lock; struct mutex cmd_lock;
/* DCON regulator */
struct regulator_dev *dcon_rdev;
bool dcon_enabled;
/* Pending EC commands */ /* Pending EC commands */
struct list_head cmd_q; struct list_head cmd_q;
spinlock_t cmd_q_lock; spinlock_t cmd_q_lock;
@ -346,9 +351,61 @@ static struct dentry *olpc_ec_setup_debugfs(void)
#endif /* CONFIG_DEBUG_FS */ #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)
return ret;
ec->dcon_enabled = state;
return 0;
}
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, true);
}
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, false);
}
static int dcon_regulator_is_enabled(struct regulator_dev *rdev)
{
struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
return ec->dcon_enabled ? 1 : 0;
}
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) static int olpc_ec_probe(struct platform_device *pdev)
{ {
struct olpc_ec_priv *ec; struct olpc_ec_priv *ec;
struct regulator_config config = { };
int err; int err;
if (!ec_driver) if (!ec_driver)
@ -376,6 +433,16 @@ static int olpc_ec_probe(struct platform_device *pdev)
return err; 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(); ec->dbgfs_dir = olpc_ec_setup_debugfs();
return err; return err;