regulator: mcp16502: add support for suspend

This patch adds support for entering/resuming suspend states.
It does this by setting the LPM pin of the PMIC.

When suspending the PMIC will enter the Low-power mode
when the LPM pin will be set to high. If the suspend target state
is suspend-to-mem, the PMIC will transition to Hibernate mode,
otherwise, if it is standby, it will remain in Low-power mode.

Signed-off-by: Andrei Stefanescu <andrei.stefanescu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/mcp16502.c b/drivers/regulator/mcp16502.c
index 7cbc96f7afcf9884b5aec7d6f3c882928375aebd..25d7b433fafd82d935ab7c0486e6b51f681a5f16 100644 (file)
--- a/drivers/regulator/mcp16502.c
+++ b/drivers/regulator/mcp16502.c
@@ -497,6 +497,37 @@ static int mcp16502_probe(struct i2c_client *client,
        return 0;
 }
 
+#ifdef CONFIG_SUSPEND
+static int mcp16502_suspend_noirq(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct mcp16502 *mcp = i2c_get_clientdata(client);
+
+       mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);
+
+       return 0;
+}
+
+static int mcp16502_resume_noirq(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct mcp16502 *mcp = i2c_get_clientdata(client);
+
+       mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
+
+       return 0;
+}
+#else /* !CONFIG_SUSPEND */
+#define mcp16502_suspend NULL
+#define mcp16502_resume NULL
+#endif /* !CONFIG_SUSPEND */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops mcp16502_pm_ops = {
+       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
+                                    mcp16502_resume_noirq)
+};
+#endif
 static const struct i2c_device_id mcp16502_i2c_id[] = {
        { "mcp16502", 0 },
        { }
@@ -508,6 +539,9 @@ static struct i2c_driver mcp16502_drv = {
        .driver         = {
                .name   = "mcp16502-regulator",
                .of_match_table = of_match_ptr(mcp16502_ids),
+#ifdef CONFIG_PM
+               .pm = &mcp16502_pm_ops,
+#endif
        },
        .id_table       = mcp16502_i2c_id,
 };