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Date: Thu, 21 Mar 2013 14:09:54 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: linux-i2c@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
ben-linux@...ff.org, Jean Delvare <khali@...ux-fr.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Christian Ruppert <christian.ruppert@...lis.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 1/7] i2c-designware: move to managed functions (devm_*)
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
This makes the error handling much more simpler than open-coding everything
and in addition makes the probe function smaller and tidier.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/i2c/busses/i2c-designware-platdrv.c | 73 ++++++++-------------------
1 file changed, 20 insertions(+), 53 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 0ceb6e1..c19c4ce 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -92,7 +92,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
{
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
- struct resource *mem, *ioarea;
+ struct resource *mem;
int irq, r;
/* NOTE: driver uses the static register mapping */
@@ -108,32 +108,27 @@ static int dw_i2c_probe(struct platform_device *pdev)
return irq; /* -ENXIO */
}
- ioarea = request_mem_region(mem->start, resource_size(mem),
- pdev->name);
- if (!ioarea) {
- dev_err(&pdev->dev, "I2C region already claimed\n");
- return -EBUSY;
- }
+ dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
- dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
- if (!dev) {
- r = -ENOMEM;
- goto err_release_region;
+ dev->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dev->base)) {
+ dev_err(&pdev->dev, "I2C region already claimed\n");
+ return PTR_ERR(dev->base);
}
init_completion(&dev->cmd_complete);
mutex_init(&dev->lock);
- dev->dev = get_device(&pdev->dev);
+ dev->dev = &pdev->dev;
dev->irq = irq;
platform_set_drvdata(pdev, dev);
- dev->clk = clk_get(&pdev->dev, NULL);
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
- if (IS_ERR(dev->clk)) {
- r = -ENODEV;
- goto err_free_mem;
- }
+ if (IS_ERR(dev->clk))
+ return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
dev->functionality =
@@ -146,13 +141,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
- dev->base = ioremap(mem->start, resource_size(mem));
- if (dev->base == NULL) {
- dev_err(&pdev->dev, "failure mapping io resources\n");
- r = -EBUSY;
- goto err_unuse_clocks;
- }
-
/* Try first if we can configure the device from ACPI */
r = dw_i2c_acpi_configure(pdev);
if (r) {
@@ -164,13 +152,14 @@ static int dw_i2c_probe(struct platform_device *pdev)
}
r = i2c_dw_init(dev);
if (r)
- goto err_iounmap;
+ return r;
i2c_dw_disable_int(dev);
- r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev);
+ r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
+ pdev->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
- goto err_iounmap;
+ return r;
}
adap = &dev->adapter;
@@ -187,57 +176,35 @@ static int dw_i2c_probe(struct platform_device *pdev)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
- goto err_free_irq;
+ return r;
}
of_i2c_register_devices(adap);
acpi_i2c_register_devices(adap);
+ /* Increase reference counter */
+ get_device(&pdev->dev);
+
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_put(&pdev->dev);
return 0;
-
-err_free_irq:
- free_irq(dev->irq, dev);
-err_iounmap:
- iounmap(dev->base);
-err_unuse_clocks:
- clk_disable_unprepare(dev->clk);
- clk_put(dev->clk);
- dev->clk = NULL;
-err_free_mem:
- put_device(&pdev->dev);
- kfree(dev);
-err_release_region:
- release_mem_region(mem->start, resource_size(mem));
-
- return r;
}
static int dw_i2c_remove(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
- struct resource *mem;
pm_runtime_get_sync(&pdev->dev);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
- clk_disable_unprepare(dev->clk);
- clk_put(dev->clk);
- dev->clk = NULL;
-
i2c_dw_disable(dev);
- free_irq(dev->irq, dev);
- kfree(dev);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(mem->start, resource_size(mem));
return 0;
}
--
1.7.10.4
--
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