1 files changed, 64 insertions, 44 deletions

diff --git a/drivers/media/radio/si4713/si4713.c b/drivers/media/radio/si4713/si4713.c
index 4f3308f91608..5d26b9ad014d 100644
--- a/drivers/media/radio/si4713/si4713.c
+++ b/drivers/media/radio/si4713/si4713.c
@@ -27,11 +27,11 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
-#include <linux/regulator/consumer.h>
 #include <linux/module.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-common.h>
+#include <linux/regulator/consumer.h>
 
 #include "si4713.h"
 
@@ -213,6 +213,7 @@ static int si4713_send_command(struct si4713_device *sdev, const u8 command,
 				u8 response[], const int respn, const int usecs)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
+	unsigned long until_jiffies;
 	u8 data1[MAX_ARGS + 1];
 	int err;
 
@@ -228,30 +229,39 @@ static int si4713_send_command(struct si4713_device *sdev, const u8 command,
 	if (err != argn + 1) {
 		v4l2_err(&sdev->sd, "Error while sending command 0x%02x\n",
 			command);
-		return (err > 0) ? -EIO : err;
+		return err < 0 ? err : -EIO;
 	}
 
+	until_jiffies = jiffies + usecs_to_jiffies(usecs) + 1;
+
 	/* Wait response from interrupt */
-	if (!wait_for_completion_timeout(&sdev->work,
+	if (client->irq) {
+		if (!wait_for_completion_timeout(&sdev->work,
 				usecs_to_jiffies(usecs) + 1))
-		v4l2_warn(&sdev->sd,
+			v4l2_warn(&sdev->sd,
 				"(%s) Device took too much time to answer.\n",
 				__func__);
-
-	/* Then get the response */
-	err = i2c_master_recv(client, response, respn);
-	if (err != respn) {
-		v4l2_err(&sdev->sd,
-			"Error while reading response for command 0x%02x\n",
-			command);
-		return (err > 0) ? -EIO : err;
 	}
 
-	DBG_BUFFER(&sdev->sd, "Response", response, respn);
-	if (check_command_failed(response[0]))
-		return -EBUSY;
+	do {
+		err = i2c_master_recv(client, response, respn);
+		if (err != respn) {
+			v4l2_err(&sdev->sd,
+				"Error %d while reading response for command 0x%02x\n",
+				err, command);
+			return err < 0 ? err : -EIO;
+		}
+
+		DBG_BUFFER(&sdev->sd, "Response", response, respn);
+		if (!check_command_failed(response[0]))
+			return 0;
 
-	return 0;
+		if (client->irq)
+			return -EBUSY;
+		msleep(1);
+	} while (jiffies <= until_jiffies);
+
+	return -EBUSY;
 }
 
 /*
@@ -344,14 +354,15 @@ static int si4713_write_property(struct si4713_device *sdev, u16 prop, u16 val)
  */
 static int si4713_powerup(struct si4713_device *sdev)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
 	int err;
 	u8 resp[SI4713_PWUP_NRESP];
 	/*
 	 * 	.First byte = Enabled interrupts and boot function
 	 * 	.Second byte = Input operation mode
 	 */
-	const u8 args[SI4713_PWUP_NARGS] = {
-		SI4713_PWUP_CTSIEN | SI4713_PWUP_GPO2OEN | SI4713_PWUP_FUNC_TX,
+	u8 args[SI4713_PWUP_NARGS] = {
+		SI4713_PWUP_GPO2OEN | SI4713_PWUP_FUNC_TX,
 		SI4713_PWUP_OPMOD_ANALOG,
 	};
 
@@ -369,6 +380,9 @@ static int si4713_powerup(struct si4713_device *sdev)
 		gpio_set_value(sdev->gpio_reset, 1);
 	}
 
+	if (client->irq)
+		args[0] |= SI4713_PWUP_CTSIEN;
+
 	err = si4713_send_command(sdev, SI4713_CMD_POWER_UP,
 					args, ARRAY_SIZE(args),
 					resp, ARRAY_SIZE(resp),
@@ -380,7 +394,8 @@ static int si4713_powerup(struct si4713_device *sdev)
 		v4l2_dbg(1, debug, &sdev->sd, "Device in power up mode\n");
 		sdev->power_state = POWER_ON;
 
-		err = si4713_write_property(sdev, SI4713_GPO_IEN,
+		if (client->irq)
+			err = si4713_write_property(sdev, SI4713_GPO_IEN,
 						SI4713_STC_INT | SI4713_CTS);
 	} else {
 		if (gpio_is_valid(sdev->gpio_reset))
@@ -465,33 +480,39 @@ static int si4713_checkrev(struct si4713_device *sdev)
  */
 static int si4713_wait_stc(struct si4713_device *sdev, const int usecs)
 {
-	int err;
+	struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
 	u8 resp[SI4713_GET_STATUS_NRESP];
+	unsigned long start_jiffies = jiffies;
+	int err;
 
-	/* Wait response from STC interrupt */
-	if (!wait_for_completion_timeout(&sdev->work,
-			usecs_to_jiffies(usecs) + 1))
+	if (client->irq &&
+	    !wait_for_completion_timeout(&sdev->work, usecs_to_jiffies(usecs) + 1))
 		v4l2_warn(&sdev->sd,
-			"%s: device took too much time to answer (%d usec).\n",
-				__func__, usecs);
-
-	/* Clear status bits */
-	err = si4713_send_command(sdev, SI4713_CMD_GET_INT_STATUS,
-					NULL, 0,
-					resp, ARRAY_SIZE(resp),
-					DEFAULT_TIMEOUT);
-
-	if (err < 0)
-		goto exit;
-
-	v4l2_dbg(1, debug, &sdev->sd,
-			"%s: status bits: 0x%02x\n", __func__, resp[0]);
-
-	if (!(resp[0] & SI4713_STC_INT))
-		err = -EIO;
-
-exit:
-	return err;
+			"(%s) Device took too much time to answer.\n", __func__);
+
+	for (;;) {
+		/* Clear status bits */
+		err = si4713_send_command(sdev, SI4713_CMD_GET_INT_STATUS,
+				NULL, 0,
+				resp, ARRAY_SIZE(resp),
+				DEFAULT_TIMEOUT);
+		/* The USB device returns errors when it waits for the
+		 * STC bit to be set. Hence polling */
+		if (err >= 0) {
+			v4l2_dbg(1, debug, &sdev->sd,
+				"%s: status bits: 0x%02x\n", __func__, resp[0]);
+
+			if (resp[0] & SI4713_STC_INT)
+				return 0;
+		}
+		if (jiffies_to_usecs(jiffies - start_jiffies) > usecs)
+			return err < 0 ? err : -EIO;
+		/* We sleep here for 3 ms in order to avoid flooding the device
+		 * with USB requests. The si4713 USB driver was developed
+		 * by reverse engineering the Windows USB driver. The windows
+		 * driver also has a ~2.5 ms delay between responses. */
+		msleep(3);
+	}
 }
 
 /*
@@ -1024,7 +1045,6 @@ static int si4713_initialize(struct si4713_device *sdev)
 	if (rval < 0)
 		return rval;
 
-
 	sdev->frequency = DEFAULT_FREQUENCY;
 	sdev->stereo = 1;
 	sdev->tune_rnl = DEFAULT_TUNE_RNL;