summaryrefslogtreecommitdiffstats
path: root/drivers/i2c
diff options
context:
space:
mode:
authorMika Westerberg <mika.westerberg@linux.intel.com>2013-01-17 12:31:07 +0200
committerWolfram Sang <w.sang@pengutronix.de>2013-01-28 05:26:42 +0100
commitb61b14154b19e1ef1da9c1e283f0cf93470e0c70 (patch)
treec82e1c647347d2f18becf6bec50ff151087469a5 /drivers/i2c
parent7272194ed391f9db8bb320c50d715e7e6bba8ff3 (diff)
downloadlinux-b61b14154b19e1ef1da9c1e283f0cf93470e0c70.tar.bz2
i2c-designware: add support for Intel Lynxpoint
Intel Lynxpoint has two I2C controllers. These controllers are enumerated from ACPI namespace with IDs INT33C2 and INT33C3. Add support for these to the I2C DesignWare platform driver. This is based on the work of Dirk Brandewie. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c49
1 files changed, 46 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index d8afc85420be..d2a33e93f8ab 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -40,6 +40,7 @@
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/acpi.h>
#include "i2c-designware-core.h"
static struct i2c_algorithm i2c_dw_algo = {
@@ -51,6 +52,42 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
return clk_get_rate(dev->clk)/1000;
}
+#ifdef CONFIG_ACPI
+static int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+ struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+ struct acpi_device *adev;
+ int busno, ret;
+
+ if (!ACPI_HANDLE(&pdev->dev))
+ return -ENODEV;
+
+ ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
+ if (ret)
+ return -ENODEV;
+
+ dev->adapter.nr = -1;
+ if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno))
+ dev->adapter.nr = busno;
+
+ dev->tx_fifo_depth = 32;
+ dev->rx_fifo_depth = 32;
+ return 0;
+}
+
+static const struct acpi_device_id dw_i2c_acpi_match[] = {
+ { "INT33C2", 0 },
+ { "INT33C3", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
+#else
+static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+ return -ENODEV;
+}
+#endif
+
static int dw_i2c_probe(struct platform_device *pdev)
{
struct dw_i2c_dev *dev;
@@ -115,18 +152,22 @@ static int dw_i2c_probe(struct platform_device *pdev)
r = -EBUSY;
goto err_unuse_clocks;
}
- {
+
+ /* Try first if we can configure the device from ACPI */
+ r = dw_i2c_acpi_configure(pdev);
+ if (r) {
u32 param1 = i2c_dw_read_comp_param(dev);
dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
+ dev->adapter.nr = pdev->id;
}
r = i2c_dw_init(dev);
if (r)
goto err_iounmap;
i2c_dw_disable_int(dev);
- r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
+ r = request_irq(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;
@@ -141,14 +182,15 @@ static int dw_i2c_probe(struct platform_device *pdev)
adap->algo = &i2c_dw_algo;
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;
+ ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev));
- adap->nr = pdev->id;
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err_free_irq;
}
of_i2c_register_devices(adap);
+ acpi_i2c_register_devices(adap);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
@@ -243,6 +285,7 @@ static struct platform_driver dw_i2c_driver = {
.name = "i2c_designware",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(dw_i2c_of_match),
+ .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
.pm = &dw_i2c_dev_pm_ops,
},
};