linux-kernel - [RFC PATCH 08/13] regulator: bd71828: Support in-kernel APIs to change run-level

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Message-ID: <3275428ea15aed2de31e1304769273e5eb637829.1571302099.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Thu, 17 Oct 2019 12:51:45 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     matti.vaittinen@...rohmeurope.com, mazziesaccount@...il.com
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: [RFC PATCH 08/13] regulator: bd71828: Support in-kernel APIs to
 change run-level

Add exported functions bd71828_set_runlevel and
bd71828_get_runlevel for setting and getting the system run
level.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
 drivers/regulator/bd71828-regulator.c | 67 +++++++++++++++++++++++++++
 include/linux/mfd/rohm-bd71828.h      |  2 +
 2 files changed, 69 insertions(+)

diff --git a/drivers/regulator/bd71828-regulator.c b/drivers/regulator/bd71828-regulator.c
index d5d0dcee90cf..e242d829cbf5 100644
--- a/drivers/regulator/bd71828-regulator.c
+++ b/drivers/regulator/bd71828-regulator.c
@@ -505,6 +505,73 @@ int bd71828_set_runlevel_voltage(struct regulator *regulator, unsigned int uv,
 }
 EXPORT_SYMBOL(bd71828_set_runlevel_voltage);
 
+/**
+ * bd71828_set_runlevel - change system run-level.
+ *
+ * @regulator:	pointer to one of the BD71828 regulators obtained by
+ *		call to regulator_get
+ * @level:	New run-level the system should enter
+ *
+ * Changes the system to run-level which was given as argument. This
+ * operation will change state of all regulators which are set to be
+ * controlled by run-levels. Note that 'regulator' must point to a
+ * regulator which is controlled by run-levels.
+ */
+int bd71828_set_runlevel(struct regulator *regulator, unsigned int level)
+{
+	struct regulator_dev *rdev = regulator->rdev;
+	struct bd71828_regulator_data *rd = rdev_get_drvdata(rdev);
+
+	if (!rd)
+		return -ENOENT;
+
+	if (!rd || !rd->allow_runlvl)
+		return -EINVAL;
+
+	if (rd->gps)
+		return bd71828_dvs_gpio_set_run_level(rd, level);
+
+	return bd71828_dvs_i2c_set_run_level(rd->regmap, level);
+}
+EXPORT_SYMBOL(bd71828_set_runlevel);
+
+/**
+ * bd71828_get_runlevel - get the current system run-level.
+ *
+ * @regulator:	pointer to one of the BD71828 regulators obtained by
+ *		call to regulator_get
+ * @level:	Pointer to value where current run-level is stored
+ *
+ * Returns the current system run-level. Note that 'regulator' must
+ * point to a regulator which is controlled by run-levels.
+ */
+int bd71828_get_runlevel(struct regulator *regulator, unsigned int *level)
+{
+	struct regulator_dev *rdev = regulator->rdev;
+	struct bd71828_regulator_data *rd = rdev_get_drvdata(rdev);
+	int ret;
+
+	if (!rd)
+		return -ENOENT;
+
+	if (!rd || !rd->allow_runlvl)
+		return -EINVAL;
+
+	if (!rd->gps)
+		ret = bd71828_dvs_i2c_get_run_level(rd->regmap, rd);
+	else
+		ret = bd71828_dvs_gpio_get_run_level(rd);
+
+	if (ret < 0)
+		return ret;
+
+	*level = (unsigned int) ret;
+
+	return 0;
+}
+EXPORT_SYMBOL(bd71828_get_runlevel);
+
+
 static const struct regulator_ops dvs_buck_gpio_ops = {
 	.is_enabled = bd71828_dvs_gpio_is_enabled,
 	.get_voltage = bd71828_dvs_gpio_get_voltage,
diff --git a/include/linux/mfd/rohm-bd71828.h b/include/linux/mfd/rohm-bd71828.h
index 5f15c6a309e6..bbbd4f118550 100644
--- a/include/linux/mfd/rohm-bd71828.h
+++ b/include/linux/mfd/rohm-bd71828.h
@@ -424,5 +424,7 @@ enum {
 
 int bd71828_set_runlevel_voltage(struct regulator *regulator, unsigned int uv,
 				 unsigned int level);
+int bd71828_set_runlevel(struct regulator *regulator, unsigned int level);
+int bd71828_get_runlevel(struct regulator *regulator, unsigned int *level);
 
 #endif /* __LINUX_MFD_BD71828_H__ */
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]