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path: root/drivers/i2c/busses/i2c-viai2c-common.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-viai2c-common.c')
-rw-r--r--drivers/i2c/busses/i2c-viai2c-common.c71
1 files changed, 9 insertions, 62 deletions
diff --git a/drivers/i2c/busses/i2c-viai2c-common.c b/drivers/i2c/busses/i2c-viai2c-common.c
index 1844d13f1f79..162b31306cba 100644
--- a/drivers/i2c/busses/i2c-viai2c-common.c
+++ b/drivers/i2c/busses/i2c-viai2c-common.c
@@ -17,6 +17,7 @@ int viai2c_wait_bus_not_busy(struct viai2c *i2c)
return 0;
}
+EXPORT_SYMBOL_GPL(viai2c_wait_bus_not_busy);
static int viai2c_write(struct viai2c *i2c, struct i2c_msg *pmsg, int last)
{
@@ -121,6 +122,7 @@ int viai2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
return (ret < 0) ? ret : i;
}
+EXPORT_SYMBOL_GPL(viai2c_xfer);
/*
* Main process of the byte mode xfer
@@ -130,7 +132,7 @@ int viai2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
* 0: there is still data that needs to be transferred
* -EIO: error occurred
*/
-static int viai2c_irq_xfer(struct viai2c *i2c)
+int viai2c_irq_xfer(struct viai2c *i2c)
{
u16 val;
struct i2c_msg *msg = i2c->msg;
@@ -171,51 +173,11 @@ static int viai2c_irq_xfer(struct viai2c *i2c)
return i2c->xfered_len == msg->len;
}
-
-int __weak viai2c_fifo_irq_xfer(struct viai2c *i2c, bool irq)
-{
- return 0;
-}
-
-static irqreturn_t viai2c_isr(int irq, void *data)
-{
- struct viai2c *i2c = data;
- u8 status;
-
- /* save the status and write-clear it */
- status = readw(i2c->base + VIAI2C_REG_ISR);
- if (!status && i2c->platform == VIAI2C_PLAT_ZHAOXIN)
- return IRQ_NONE;
-
- writew(status, i2c->base + VIAI2C_REG_ISR);
-
- i2c->ret = 0;
- if (status & VIAI2C_ISR_NACK_ADDR)
- i2c->ret = -EIO;
-
- if (i2c->platform == VIAI2C_PLAT_WMT && (status & VIAI2C_ISR_SCL_TIMEOUT))
- i2c->ret = -ETIMEDOUT;
-
- if (!i2c->ret) {
- if (i2c->mode == VIAI2C_BYTE_MODE)
- i2c->ret = viai2c_irq_xfer(i2c);
- else
- i2c->ret = viai2c_fifo_irq_xfer(i2c, true);
- }
-
- /* All the data has been successfully transferred or error occurred */
- if (i2c->ret)
- complete(&i2c->complete);
-
- return IRQ_HANDLED;
-}
+EXPORT_SYMBOL_GPL(viai2c_irq_xfer);
int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat)
{
- int err;
- int irq_flags;
struct viai2c *i2c;
- struct device_node *np = pdev->dev.of_node;
i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c)
@@ -225,28 +187,8 @@ int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat)
if (IS_ERR(i2c->base))
return PTR_ERR(i2c->base);
- if (plat == VIAI2C_PLAT_WMT) {
- irq_flags = 0;
- i2c->irq = irq_of_parse_and_map(np, 0);
- if (!i2c->irq)
- return -EINVAL;
- } else if (plat == VIAI2C_PLAT_ZHAOXIN) {
- irq_flags = IRQF_SHARED;
- i2c->irq = platform_get_irq(pdev, 0);
- if (i2c->irq < 0)
- return i2c->irq;
- } else {
- return dev_err_probe(&pdev->dev, -EINVAL, "wrong platform type\n");
- }
-
i2c->platform = plat;
- err = devm_request_irq(&pdev->dev, i2c->irq, viai2c_isr,
- irq_flags, pdev->name, i2c);
- if (err)
- return dev_err_probe(&pdev->dev, err,
- "failed to request irq %i\n", i2c->irq);
-
i2c->dev = &pdev->dev;
init_completion(&i2c->complete);
platform_set_drvdata(pdev, i2c);
@@ -254,3 +196,8 @@ int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat)
*pi2c = i2c;
return 0;
}
+EXPORT_SYMBOL_GPL(viai2c_init);
+
+MODULE_DESCRIPTION("Via/Wondermedia/Zhaoxin I2C master-mode bus adapter");
+MODULE_AUTHOR("Tony Prisk <linux@prisktech.co.nz>");
+MODULE_LICENSE("GPL");