linux-kernel - [PATCH 1/6] mfd: TPS65910: Handle non-existent devices

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Date:	Tue, 18 Oct 2011 13:26:23 -0500
From:	Kyle Manna <kyle.manna@...l7.com>
To:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lrg@...com>
Cc:	Kyle Manna <kyle.manna@...l7.com>,
	Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>,
	Graeme Gregory <gg@...mlogic.co.uk>
Subject: [PATCH 1/6] mfd: TPS65910: Handle non-existent devices

Attempt to read the first register of the device, if there is no
device return -ENODEV

Signed-off-by: Kyle Manna <kyle.manna@...l7.com>
---
 drivers/mfd/tps65910.c |   20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index 6f5b8cf..03fb4a7 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -138,6 +138,7 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	struct tps65910_board *pmic_plat_data;
 	struct tps65910_platform_data *init_data;
 	int ret = 0;
+	char buff;
 
 	pmic_plat_data = dev_get_platdata(&i2c->dev);
 	if (!pmic_plat_data)
@@ -161,11 +162,17 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	tps65910->write = tps65910_i2c_write;
 	mutex_init(&tps65910->io_mutex);
 
-	ret = mfd_add_devices(tps65910->dev, -1,
-			      tps65910s, ARRAY_SIZE(tps65910s),
-			      NULL, 0);
-	if (ret < 0)
+	/* Check that the device is actually there */
+	ret = tps65910_i2c_read(tps65910, 0x0, 1, &buff);
+	if (ret < 0) {
+		ret = -ENODEV;
 		goto err;
+	}
+
+	ret = mfd_add_devices(tps65910->dev, -1, tps65910s,
+			ARRAY_SIZE(tps65910s), NULL, 0);
+	if (ret < 0)
+		goto err2;
 
 	init_data->irq = pmic_plat_data->irq;
 	init_data->irq_base = pmic_plat_data->irq;
@@ -174,13 +181,14 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 
 	ret = tps65910_irq_init(tps65910, init_data->irq, init_data);
 	if (ret < 0)
-		goto err;
+		goto err2;
 
 	kfree(init_data);
 	return ret;
 
-err:
+err2:
 	mfd_remove_devices(tps65910->dev);
+err:
 	kfree(tps65910);
 	kfree(init_data);
 	return ret;
-- 
1.7.5.4

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