staging: wilc1000: return zero on success and non-zero on function failure

Some of the HIF layer API's return zero for failure and non-zero for
success condition. Now, modified the functions to return zero for success
and non-zero for failure as its recommended approach suggested in [1].

1. https://lore.kernel.org/driverdev-devel/20191113183322.a54mh2w6dulklgsd@kili.mountain/Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Link: https://lore.kernel.org/r/20200123182129.4053-1-ajay.kathat@microchip.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/netdev.c

@@ -183,7 +183,7 @@ static int wilc_wlan_get_firmware(struct net_device *dev)
 {
 	struct wilc_vif *vif = netdev_priv(dev);
 	struct wilc *wilc = vif->wilc;
-	int chip_id, ret = 0;
+	int chip_id;
 	const struct firmware *wilc_firmware;
 	char *firmware;
 
@@ -198,14 +198,11 @@ static int wilc_wlan_get_firmware(struct net_device *dev)
 
 	if (request_firmware(&wilc_firmware, firmware, wilc->dev) != 0) {
 		netdev_err(dev, "%s - firmware not available\n", firmware);
-		ret = -1;
-		goto fail;
+		return -EINVAL;
 	}
 	wilc->firmware = wilc_firmware;
 
-fail:
-
-	return ret;
+	return 0;
 }
 
 static int wilc_start_firmware(struct net_device *dev)
@@ -215,7 +212,7 @@ static int wilc_start_firmware(struct net_device *dev)
 	int ret = 0;
 
 	ret = wilc_wlan_start(wilc);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	if (!wait_for_completion_timeout(&wilc->sync_event,
@@ -238,7 +235,7 @@ static int wilc1000_firmware_download(struct net_device *dev)
 
 	ret = wilc_wlan_firmware_download(wilc, wilc->firmware->data,
 					  wilc->firmware->size);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	release_firmware(wilc->firmware);
@@ -417,7 +414,7 @@ static int wilc_init_fw_config(struct net_device *dev, struct wilc_vif *vif)
 	return 0;
 
 fail:
-	return -1;
+	return -EINVAL;
 }
 
 static void wlan_deinitialize_threads(struct net_device *dev)
@@ -497,14 +494,12 @@ static int wilc_wlan_initialize(struct net_device *dev, struct wilc_vif *vif)
 		wl->close = 0;
 
 		ret = wilc_wlan_init(dev);
-		if (ret < 0)
-			return -EIO;
+		if (ret)
+			return ret;
 
 		ret = wlan_initialize_threads(dev);
-		if (ret < 0) {
-			ret = -EIO;
+		if (ret)
 			goto fail_wilc_wlan;
-		}
 
 		if (wl->gpio_irq && init_irq(dev)) {
 			ret = -EIO;
@@ -518,22 +513,17 @@ static int wilc_wlan_initialize(struct net_device *dev, struct wilc_vif *vif)
 			goto fail_irq_init;
 		}
 
-		if (wilc_wlan_get_firmware(dev)) {
-			ret = -EIO;
+		ret = wilc_wlan_get_firmware(dev);
+		if (ret)
 			goto fail_irq_enable;
-		}
 
 		ret = wilc1000_firmware_download(dev);
-		if (ret < 0) {
-			ret = -EIO;
+		if (ret)
 			goto fail_irq_enable;
-		}
 
 		ret = wilc_start_firmware(dev);
-		if (ret < 0) {
-			ret = -EIO;
+		if (ret)
 			goto fail_irq_enable;
-		}
 
 		if (wilc_wlan_cfg_get(vif, 1, WID_FIRMWARE_VERSION, 1, 0)) {
 			int size;
@@ -545,11 +535,10 @@ static int wilc_wlan_initialize(struct net_device *dev, struct wilc_vif *vif)
 			firmware_ver[size] = '\0';
 			netdev_dbg(dev, "Firmware Ver = %s\n", firmware_ver);
 		}
-		ret = wilc_init_fw_config(dev, vif);
 
-		if (ret < 0) {
+		ret = wilc_init_fw_config(dev, vif);
+		if (ret) {
 			netdev_err(dev, "Failed to configure firmware\n");
-			ret = -EIO;
 			goto fail_fw_start;
 		}
 		wl->initialized = true;
@@ -600,11 +589,11 @@ static int wilc_mac_open(struct net_device *ndev)
 	netdev_dbg(ndev, "MAC OPEN[%p]\n", ndev);
 
 	ret = wilc_init_host_int(ndev);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	ret = wilc_wlan_initialize(ndev, vif);
-	if (ret < 0) {
+	if (ret) {
 		wilc_deinit_host_int(ndev);
 		return ret;
 	}

drivers/staging/wilc1000/sdio.c

@@ -273,7 +273,7 @@ static int wilc_sdio_set_func0_csa_address(struct wilc *wilc, u32 adr)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x10c data...\n");
-		goto fail;
+		return ret;
 	}
 
 	cmd.address = 0x10d;
@@ -281,7 +281,7 @@ static int wilc_sdio_set_func0_csa_address(struct wilc *wilc, u32 adr)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x10d data...\n");
-		goto fail;
+		return ret;
 	}
 
 	cmd.address = 0x10e;
@@ -289,11 +289,9 @@ static int wilc_sdio_set_func0_csa_address(struct wilc *wilc, u32 adr)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x10e data...\n");
-		goto fail;
+		return ret;
 	}
 
-	return 1;
-fail:
 	return 0;
 }
 
@@ -311,7 +309,7 @@ static int wilc_sdio_set_func0_block_size(struct wilc *wilc, u32 block_size)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x10 data...\n");
-		goto fail;
+		return ret;
 	}
 
 	cmd.address = 0x11;
@@ -319,11 +317,9 @@ static int wilc_sdio_set_func0_block_size(struct wilc *wilc, u32 block_size)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x11 data...\n");
-		goto fail;
+		return ret;
 	}
 
-	return 1;
-fail:
 	return 0;
 }
 
@@ -347,18 +343,16 @@ static int wilc_sdio_set_func1_block_size(struct wilc *wilc, u32 block_size)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x110 data...\n");
-		goto fail;
+		return ret;
 	}
 	cmd.address = 0x111;
 	cmd.data = (u8)(block_size >> 8);
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Failed cmd52, set 0x111 data...\n");
-		goto fail;
+		return ret;
 	}
 
-	return 1;
-fail:
 	return 0;
 }
 
@@ -384,19 +378,18 @@ static int wilc_sdio_write_reg(struct wilc *wilc, u32 addr, u32 data)
 		cmd.address = addr;
 		cmd.data = data;
 		ret = wilc_sdio_cmd52(wilc, &cmd);
-		if (ret) {
+		if (ret)
 			dev_err(&func->dev,
 				"Failed cmd 52, read reg (%08x) ...\n", addr);
-			goto fail;
-		}
 	} else {
 		struct sdio_cmd53 cmd;
 
 		/**
 		 *      set the AHB address
 		 **/
-		if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-			goto fail;
+		ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+		if (ret)
+			return ret;
 
 		cmd.read_write = 1;
 		cmd.function = 0;
@@ -407,18 +400,12 @@ static int wilc_sdio_write_reg(struct wilc *wilc, u32 addr, u32 data)
 		cmd.buffer = (u8 *)&data;
 		cmd.block_size = sdio_priv->block_size;
 		ret = wilc_sdio_cmd53(wilc, &cmd);
-		if (ret) {
+		if (ret)
 			dev_err(&func->dev,
 				"Failed cmd53, write reg (%08x)...\n", addr);
-			goto fail;
-		}
 	}
 
-	return 1;
-
-fail:
-
-	return 0;
+	return ret;
 }
 
 static int wilc_sdio_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
@@ -470,14 +457,15 @@ static int wilc_sdio_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 		cmd.buffer = buf;
 		cmd.block_size = block_size;
 		if (addr > 0) {
-			if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-				goto fail;
+			ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+			if (ret)
+				return ret;
 		}
 		ret = wilc_sdio_cmd53(wilc, &cmd);
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd53 [%x], block send...\n", addr);
-			goto fail;
+			return ret;
 		}
 		if (addr > 0)
 			addr += nblk * block_size;
@@ -493,21 +481,18 @@ static int wilc_sdio_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 		cmd.block_size = block_size;
 
 		if (addr > 0) {
-			if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-				goto fail;
+			ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+			if (ret)
+				return ret;
 		}
 		ret = wilc_sdio_cmd53(wilc, &cmd);
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd53 [%x], bytes send...\n", addr);
-			goto fail;
+			return ret;
 		}
 	}
 
-	return 1;
-
-fail:
-
 	return 0;
 }
 
@@ -528,14 +513,15 @@ static int wilc_sdio_read_reg(struct wilc *wilc, u32 addr, u32 *data)
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd 52, read reg (%08x) ...\n", addr);
-			goto fail;
+			return ret;
 		}
 		*data = cmd.data;
 	} else {
 		struct sdio_cmd53 cmd;
 
-		if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-			goto fail;
+		ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+		if (ret)
+			return ret;
 
 		cmd.read_write = 0;
 		cmd.function = 0;
@@ -550,16 +536,11 @@ static int wilc_sdio_read_reg(struct wilc *wilc, u32 addr, u32 *data)
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd53, read reg (%08x)...\n", addr);
-			goto fail;
+			return ret;
 		}
 	}
 
 	le32_to_cpus(data);
-
-	return 1;
-
-fail:
-
 	return 0;
 }
 
@@ -612,14 +593,15 @@ static int wilc_sdio_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 		cmd.buffer = buf;
 		cmd.block_size = block_size;
 		if (addr > 0) {
-			if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-				goto fail;
+			ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+			if (ret)
+				return ret;
 		}
 		ret = wilc_sdio_cmd53(wilc, &cmd);
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd53 [%x], block read...\n", addr);
-			goto fail;
+			return ret;
 		}
 		if (addr > 0)
 			addr += nblk * block_size;
@@ -635,21 +617,18 @@ static int wilc_sdio_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 		cmd.block_size = block_size;
 
 		if (addr > 0) {
-			if (!wilc_sdio_set_func0_csa_address(wilc, addr))
-				goto fail;
+			ret = wilc_sdio_set_func0_csa_address(wilc, addr);
+			if (ret)
+				return ret;
 		}
 		ret = wilc_sdio_cmd53(wilc, &cmd);
 		if (ret) {
 			dev_err(&func->dev,
 				"Failed cmd53 [%x], bytes read...\n", addr);
-			goto fail;
+			return ret;
 		}
 	}
 
-	return 1;
-
-fail:
-
 	return 0;
 }
 
@@ -661,7 +640,7 @@ static int wilc_sdio_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 
 static int wilc_sdio_deinit(struct wilc *wilc)
 {
-	return 1;
+	return 0;
 }
 
 static int wilc_sdio_init(struct wilc *wilc, bool resume)
@@ -686,15 +665,16 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Fail cmd 52, enable csa...\n");
-		goto fail;
+		return ret;
 	}
 
 	/**
 	 *      function 0 block size
 	 **/
-	if (!wilc_sdio_set_func0_block_size(wilc, WILC_SDIO_BLOCK_SIZE)) {
+	ret = wilc_sdio_set_func0_block_size(wilc, WILC_SDIO_BLOCK_SIZE);
+	if (ret) {
 		dev_err(&func->dev, "Fail cmd 52, set func 0 block size...\n");
-		goto fail;
+		return ret;
 	}
 	sdio_priv->block_size = WILC_SDIO_BLOCK_SIZE;
 
@@ -710,7 +690,7 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 	if (ret) {
 		dev_err(&func->dev,
 			"Fail cmd 52, set IOE register...\n");
-		goto fail;
+		return ret;
 	}
 
 	/**
@@ -727,7 +707,7 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 		if (ret) {
 			dev_err(&func->dev,
 				"Fail cmd 52, get IOR register...\n");
-			goto fail;
+			return ret;
 		}
 		if (cmd.data == 0x2)
 			break;
@@ -735,15 +715,16 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 
 	if (loop <= 0) {
 		dev_err(&func->dev, "Fail func 1 is not ready...\n");
-		goto fail;
+		return -EINVAL;
 	}
 
 	/**
 	 *      func 1 is ready, set func 1 block size
 	 **/
-	if (!wilc_sdio_set_func1_block_size(wilc, WILC_SDIO_BLOCK_SIZE)) {
+	ret = wilc_sdio_set_func1_block_size(wilc, WILC_SDIO_BLOCK_SIZE);
+	if (ret) {
 		dev_err(&func->dev, "Fail set func 1 block size...\n");
-		goto fail;
+		return ret;
 	}
 
 	/**
@@ -757,16 +738,17 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 	ret = wilc_sdio_cmd52(wilc, &cmd);
 	if (ret) {
 		dev_err(&func->dev, "Fail cmd 52, set IEN register...\n");
-		goto fail;
+		return ret;
 	}
 
 	/**
 	 *      make sure can read back chip id correctly
 	 **/
 	if (!resume) {
-		if (!wilc_sdio_read_reg(wilc, 0x1000, &chipid)) {
+		ret = wilc_sdio_read_reg(wilc, 0x1000, &chipid);
+		if (ret) {
 			dev_err(&func->dev, "Fail cmd read chip id...\n");
-			goto fail;
+			return ret;
 		}
 		dev_err(&func->dev, "chipid (%08x)\n", chipid);
 		if ((chipid & 0xfff) > 0x2a0)
@@ -777,10 +759,6 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 			 sdio_priv->has_thrpt_enh3);
 	}
 
-	return 1;
-
-fail:
-
 	return 0;
 }
 
@@ -806,7 +784,7 @@ static int wilc_sdio_read_size(struct wilc *wilc, u32 *size)
 	tmp |= (cmd.data << 8);
 
 	*size = tmp;
-	return 1;
+	return 0;
 }
 
 static int wilc_sdio_read_int(struct wilc *wilc, u32 *int_status)
@@ -865,7 +843,7 @@ static int wilc_sdio_read_int(struct wilc *wilc, u32 *int_status)
 
 	*int_status = tmp;
 
-	return 1;
+	return 0;
 }
 
 static int wilc_sdio_clear_int_ext(struct wilc *wilc, u32 val)
@@ -909,10 +887,10 @@ static int wilc_sdio_clear_int_ext(struct wilc *wilc, u32 val)
 				dev_err(&func->dev,
 					"Failed cmd52, set 0xf8 data (%d) ...\n",
 					__LINE__);
-				goto fail;
+				return ret;
 			}
 		}
-		return 1;
+		return 0;
 	}
 	if (sdio_priv->irq_gpio) {
 		/* has_thrpt_enh2 uses register 0xf8 to clear interrupts. */
@@ -926,7 +904,6 @@ static int wilc_sdio_clear_int_ext(struct wilc *wilc, u32 val)
 		if (flags) {
 			int i;
 
-			ret = 1;
 			for (i = 0; i < sdio_priv->nint; i++) {
 				if (flags & 1) {
 					struct sdio_cmd52 cmd;
@@ -942,15 +919,12 @@ static int wilc_sdio_clear_int_ext(struct wilc *wilc, u32 val)
 						dev_err(&func->dev,
 							"Failed cmd52, set 0xf8 data (%d) ...\n",
 							__LINE__);
-						goto fail;
+						return ret;
 					}
 				}
-				if (!ret)
-					break;
 				flags >>= 1;
 			}
-			if (!ret)
-				goto fail;
+
 			for (i = sdio_priv->nint; i < MAX_NUM_INT; i++) {
 				if (flags & 1)
 					dev_err(&func->dev,
@@ -985,11 +959,9 @@ static int wilc_sdio_clear_int_ext(struct wilc *wilc, u32 val)
 			dev_err(&func->dev,
 				"Failed cmd52, set 0xf6 data (%d) ...\n",
 				__LINE__);
-			goto fail;
+			return ret;
 		}
 	}
-	return 1;
-fail:
 	return 0;
 }
 
@@ -1001,12 +973,12 @@ static int wilc_sdio_sync_ext(struct wilc *wilc, int nint)
 
 	if (nint > MAX_NUM_INT) {
 		dev_err(&func->dev, "Too many interrupts (%d)...\n", nint);
-		return 0;
+		return -EINVAL;
 	}
 	if (nint > MAX_NUN_INT_THRPT_ENH2) {
 		dev_err(&func->dev,
 			"Cannot support more than 5 interrupts when has_thrpt_enh2=1.\n");
-		return 0;
+		return -EINVAL;
 	}
 
 	sdio_priv->nint = nint;
@@ -1014,15 +986,15 @@ static int wilc_sdio_sync_ext(struct wilc *wilc, int nint)
 	/**
 	 *      Disable power sequencer
 	 **/
-	if (!wilc_sdio_read_reg(wilc, WILC_MISC, &reg)) {
+	if (wilc_sdio_read_reg(wilc, WILC_MISC, &reg)) {
 		dev_err(&func->dev, "Failed read misc reg...\n");
-		return 0;
+		return -EINVAL;
 	}
 
 	reg &= ~BIT(8);
-	if (!wilc_sdio_write_reg(wilc, WILC_MISC, reg)) {
+	if (wilc_sdio_write_reg(wilc, WILC_MISC, reg)) {
 		dev_err(&func->dev, "Failed write misc reg...\n");
-		return 0;
+		return -EINVAL;
 	}
 
 	if (sdio_priv->irq_gpio) {
@@ -1033,59 +1005,59 @@ static int wilc_sdio_sync_ext(struct wilc *wilc, int nint)
 		 *      interrupt pin mux select
 		 **/
 		ret = wilc_sdio_read_reg(wilc, WILC_PIN_MUX_0, &reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&func->dev, "Failed read reg (%08x)...\n",
 				WILC_PIN_MUX_0);
-			return 0;
+			return ret;
 		}
 		reg |= BIT(8);
 		ret = wilc_sdio_write_reg(wilc, WILC_PIN_MUX_0, reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&func->dev, "Failed write reg (%08x)...\n",
 				WILC_PIN_MUX_0);
-			return 0;
+			return ret;
 		}
 
 		/**
 		 *      interrupt enable
 		 **/
 		ret = wilc_sdio_read_reg(wilc, WILC_INTR_ENABLE, &reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&func->dev, "Failed read reg (%08x)...\n",
 				WILC_INTR_ENABLE);
-			return 0;
+			return ret;
 		}
 
 		for (i = 0; (i < 5) && (nint > 0); i++, nint--)
 			reg |= BIT((27 + i));
 		ret = wilc_sdio_write_reg(wilc, WILC_INTR_ENABLE, reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&func->dev, "Failed write reg (%08x)...\n",
 				WILC_INTR_ENABLE);
-			return 0;
+			return ret;
 		}
 		if (nint) {
 			ret = wilc_sdio_read_reg(wilc, WILC_INTR2_ENABLE, &reg);
-			if (!ret) {
+			if (ret) {
 				dev_err(&func->dev,
 					"Failed read reg (%08x)...\n",
 					WILC_INTR2_ENABLE);
-				return 0;
+				return ret;
 			}
 
 			for (i = 0; (i < 3) && (nint > 0); i++, nint--)
 				reg |= BIT(i);
 
 			ret = wilc_sdio_read_reg(wilc, WILC_INTR2_ENABLE, &reg);
-			if (!ret) {
+			if (ret) {
 				dev_err(&func->dev,
 					"Failed write reg (%08x)...\n",
 					WILC_INTR2_ENABLE);
-				return 0;
+				return ret;
 			}
 		}
 	}
-	return 1;
+	return 0;
 }
 
 /* Global sdio HIF function table */

drivers/staging/wilc1000/spi.c

@@ -88,11 +88,6 @@ static u8 crc7(u8 crc, const u8 *buffer, u32 len)
 #define CMD_SINGLE_READ				0xca
 #define CMD_RESET				0xcf
 
-#define N_OK					1
-#define N_FAIL					0
-#define N_RESET					-1
-#define N_RETRY					-2
-
 #define DATA_PKT_SZ_256				256
 #define DATA_PKT_SZ_512				512
 #define DATA_PKT_SZ_1K				1024
@@ -299,7 +294,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 	u32 len2;
 	u8 rsp;
 	int len = 0;
-	int result = N_OK;
+	int result = 0;
 	int retry;
 	u8 crc[2];
 
@@ -387,11 +382,11 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 		break;
 
 	default:
-		result = N_FAIL;
+		result = -EINVAL;
 		break;
 	}
 
-	if (result != N_OK)
+	if (result)
 		return result;
 
 	if (!spi_priv->crc_off)
@@ -424,7 +419,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 	if (len2 > ARRAY_SIZE(wb)) {
 		dev_err(&spi->dev, "spi buffer size too small (%d) (%zu)\n",
 			len2, ARRAY_SIZE(wb));
-		return N_FAIL;
+		return -EINVAL;
 	}
 	/* zero spi write buffers. */
 	for (wix = len; wix < len2; wix++)
@@ -433,7 +428,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 
 	if (wilc_spi_tx_rx(wilc, wb, rb, len2)) {
 		dev_err(&spi->dev, "Failed cmd write, bus error...\n");
-		return N_FAIL;
+		return -EINVAL;
 	}
 
 	/*
@@ -448,7 +443,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 		dev_err(&spi->dev,
 			"Failed cmd response, cmd (%02x), resp (%02x)\n",
 			cmd, rsp);
-		return N_FAIL;
+		return -EINVAL;
 	}
 
 	/*
@@ -458,7 +453,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 	if (rsp != 0x00) {
 		dev_err(&spi->dev, "Failed cmd state response state (%02x)\n",
 			rsp);
-		return N_FAIL;
+		return -EINVAL;
 	}
 
 	if (cmd == CMD_INTERNAL_READ || cmd == CMD_SINGLE_READ ||
@@ -485,7 +480,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 		if (retry <= 0) {
 			dev_err(&spi->dev,
 				"Error, data read response (%02x)\n", rsp);
-			return N_RESET;
+			return -EAGAIN;
 		}
 	}
 
@@ -501,7 +496,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 		} else {
 			dev_err(&spi->dev,
 				"buffer overrun when reading data.\n");
-			return N_FAIL;
+			return -EINVAL;
 		}
 
 		if (!spi_priv->crc_off) {
@@ -514,7 +509,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 			} else {
 				dev_err(&spi->dev,
 					"buffer overrun when reading crc.\n");
-				return N_FAIL;
+				return -EINVAL;
 			}
 		}
 	} else if ((cmd == CMD_DMA_READ) || (cmd == CMD_DMA_EXT_READ)) {
@@ -540,7 +535,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 			if (wilc_spi_rx(wilc, &b[ix], nbytes)) {
 				dev_err(&spi->dev,
 					"Failed block read, bus err\n");
-				return N_FAIL;
+				return -EINVAL;
 			}
 
 			/*
@@ -549,7 +544,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 			if (!spi_priv->crc_off && wilc_spi_rx(wilc, crc, 2)) {
 				dev_err(&spi->dev,
 					"Failed block crc read, bus err\n");
-				return N_FAIL;
+				return -EINVAL;
 			}
 
 			ix += nbytes;
@@ -581,14 +576,14 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 				if (wilc_spi_rx(wilc, &rsp, 1)) {
 					dev_err(&spi->dev,
 						"Failed resp read, bus err\n");
-					result = N_FAIL;
+					result = -EINVAL;
 					break;
 				}
 				if (((rsp >> 4) & 0xf) == 0xf)
 					break;
 			} while (retry--);
 
-			if (result == N_FAIL)
+			if (result)
 				break;
 
 			/*
@@ -597,7 +592,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 			if (wilc_spi_rx(wilc, &b[ix], nbytes)) {
 				dev_err(&spi->dev,
 					"Failed block read, bus err\n");
-				result = N_FAIL;
+				result = -EINVAL;
 				break;
 			}
 
@@ -607,7 +602,7 @@ static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz,
 			if (!spi_priv->crc_off && wilc_spi_rx(wilc, crc, 2)) {
 				dev_err(&spi->dev,
 					"Failed block crc read, bus err\n");
-				result = N_FAIL;
+				result = -EINVAL;
 				break;
 			}
 
@@ -623,7 +618,7 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz)
 	struct spi_device *spi = to_spi_device(wilc->dev);
 	struct wilc_spi *spi_priv = wilc->bus_data;
 	int ix, nbytes;
-	int result = 1;
+	int result = 0;
 	u8 cmd, order, crc[2] = {0};
 
 	/*
@@ -651,7 +646,7 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz)
 		if (wilc_spi_tx(wilc, &cmd, 1)) {
 			dev_err(&spi->dev,
 				"Failed data block cmd write, bus error...\n");
-			result = N_FAIL;
+			result = -EINVAL;
 			break;
 		}
 
@@ -661,7 +656,7 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz)
 		if (wilc_spi_tx(wilc, &b[ix], nbytes)) {
 			dev_err(&spi->dev,
 				"Failed data block write, bus error...\n");
-			result = N_FAIL;
+			result = -EINVAL;
 			break;
 		}
 
@@ -671,7 +666,7 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz)
 		if (!spi_priv->crc_off) {
 			if (wilc_spi_tx(wilc, crc, 2)) {
 				dev_err(&spi->dev, "Failed data block crc write, bus error...\n");
-				result = N_FAIL;
+				result = -EINVAL;
 				break;
 			}
 		}
@@ -700,7 +695,7 @@ static int spi_internal_write(struct wilc *wilc, u32 adr, u32 dat)
 	cpu_to_le32s(&dat);
 	result = spi_cmd_complete(wilc, CMD_INTERNAL_WRITE, adr, (u8 *)&dat, 4,
 				  0);
-	if (result != N_OK)
+	if (result)
 		dev_err(&spi->dev, "Failed internal write cmd...\n");
 
 	return result;
@@ -713,14 +708,14 @@ static int spi_internal_read(struct wilc *wilc, u32 adr, u32 *data)
 
 	result = spi_cmd_complete(wilc, CMD_INTERNAL_READ, adr, (u8 *)data, 4,
 				  0);
-	if (result != N_OK) {
+	if (result) {
 		dev_err(&spi->dev, "Failed internal read cmd...\n");
-		return 0;
+		return result;
 	}
 
 	le32_to_cpus(data);
 
-	return 1;
+	return result;
 }
 
 /********************************************
@@ -744,7 +739,7 @@ static int wilc_spi_write_reg(struct wilc *wilc, u32 addr, u32 data)
 	}
 
 	result = spi_cmd_complete(wilc, cmd, addr, (u8 *)&data, 4, clockless);
-	if (result != N_OK)
+	if (result)
 		dev_err(&spi->dev, "Failed cmd, write reg (%08x)...\n", addr);
 
 	return result;
@@ -759,23 +754,23 @@ static int wilc_spi_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 	 * has to be greated than 4
 	 */
 	if (size <= 4)
-		return 0;
+		return -EINVAL;
 
 	result = spi_cmd_complete(wilc, CMD_DMA_EXT_WRITE, addr, NULL, size, 0);
-	if (result != N_OK) {
+	if (result) {
 		dev_err(&spi->dev,
 			"Failed cmd, write block (%08x)...\n", addr);
-		return 0;
+		return result;
 	}
 
 	/*
 	 * Data
 	 */
 	result = spi_data_write(wilc, buf, size);
-	if (result != N_OK)
+	if (result)
 		dev_err(&spi->dev, "Failed block data write...\n");
 
-	return 1;
+	return result;
 }
 
 static int wilc_spi_read_reg(struct wilc *wilc, u32 addr, u32 *data)
@@ -792,14 +787,14 @@ static int wilc_spi_read_reg(struct wilc *wilc, u32 addr, u32 *data)
 	}
 
 	result = spi_cmd_complete(wilc, cmd, addr, (u8 *)data, 4, clockless);
-	if (result != N_OK) {
+	if (result) {
 		dev_err(&spi->dev, "Failed cmd, read reg (%08x)...\n", addr);
-		return 0;
+		return result;
 	}
 
 	le32_to_cpus(data);
 
-	return 1;
+	return 0;
 }
 
 static int wilc_spi_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
@@ -808,15 +803,13 @@ static int wilc_spi_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 	int result;
 
 	if (size <= 4)
-		return 0;
+		return -EINVAL;
 
 	result = spi_cmd_complete(wilc, CMD_DMA_EXT_READ, addr, buf, size, 0);
-	if (result != N_OK) {
+	if (result)
 		dev_err(&spi->dev, "Failed cmd, read block (%08x)...\n", addr);
-		return 0;
-	}
 
-	return 1;
+	return result;
 }
 
 /********************************************
@@ -830,7 +823,7 @@ static int wilc_spi_deinit(struct wilc *wilc)
 	/*
 	 * TODO:
 	 */
-	return 1;
+	return 0;
 }
 
 static int wilc_spi_init(struct wilc *wilc, bool resume)
@@ -840,13 +833,14 @@ static int wilc_spi_init(struct wilc *wilc, bool resume)
 	u32 reg;
 	u32 chipid;
 	static int isinit;
+	int ret;
 
 	if (isinit) {
-		if (!wilc_spi_read_reg(wilc, 0x1000, &chipid)) {
+		ret = wilc_spi_read_reg(wilc, 0x1000, &chipid);
+		if (ret)
 			dev_err(&spi->dev, "Fail cmd read chip id...\n");
-			return 0;
-		}
-		return 1;
+
+		return ret;
 	}
 
 	/*
@@ -858,7 +852,8 @@ static int wilc_spi_init(struct wilc *wilc, bool resume)
 	 * way to reset
 	 */
 	/* the SPI to it's initial value. */
-	if (!spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, &reg)) {
+	ret = spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, &reg);
+	if (ret) {
 		/*
 		 * Read failed. Try with CRC off. This might happen when module
 		 * is removed but chip isn't reset
@@ -866,24 +861,26 @@ static int wilc_spi_init(struct wilc *wilc, bool resume)
 		spi_priv->crc_off = 1;
 		dev_err(&spi->dev,
 			"Failed read with CRC on, retrying with CRC off\n");
-		if (!spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, &reg)) {
+		ret = spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, &reg);
+		if (ret) {
 			/*
 			 * Read failed with both CRC on and off,
 			 * something went bad
 			 */
 			dev_err(&spi->dev, "Failed internal read protocol\n");
-			return 0;
+			return ret;
 		}
 	}
 	if (spi_priv->crc_off == 0) {
 		reg &= ~0xc; /* disable crc checking */
 		reg &= ~0x70;
 		reg |= (0x5 << 4);
-		if (!spi_internal_write(wilc, WILC_SPI_PROTOCOL_OFFSET, reg)) {
+		ret = spi_internal_write(wilc, WILC_SPI_PROTOCOL_OFFSET, reg);
+		if (ret) {
 			dev_err(&spi->dev,
 				"[wilc spi %d]: Failed internal write reg\n",
 				__LINE__);
-			return 0;
+			return ret;
 		}
 		spi_priv->crc_off = 1;
 	}
@@ -891,14 +888,15 @@ static int wilc_spi_init(struct wilc *wilc, bool resume)
 	/*
 	 * make sure can read back chip id correctly
 	 */
-	if (!wilc_spi_read_reg(wilc, 0x1000, &chipid)) {
+	ret = wilc_spi_read_reg(wilc, 0x1000, &chipid);
+	if (ret) {
 		dev_err(&spi->dev, "Fail cmd read chip id...\n");
-		return 0;
+		return ret;
 	}
 
 	isinit = 1;
 
-	return 1;
+	return 0;
 }
 
 static int wilc_spi_read_size(struct wilc *wilc, u32 *size)
@@ -930,7 +928,7 @@ static int wilc_spi_sync_ext(struct wilc *wilc, int nint)
 
 	if (nint > MAX_NUM_INT) {
 		dev_err(&spi->dev, "Too many interrupts (%d)...\n", nint);
-		return 0;
+		return -EINVAL;
 	}
 
 	spi_priv->nint = nint;
@@ -939,58 +937,58 @@ static int wilc_spi_sync_ext(struct wilc *wilc, int nint)
 	 * interrupt pin mux select
 	 */
 	ret = wilc_spi_read_reg(wilc, WILC_PIN_MUX_0, &reg);
-	if (!ret) {
+	if (ret) {
 		dev_err(&spi->dev, "Failed read reg (%08x)...\n",
 			WILC_PIN_MUX_0);
-		return 0;
+		return ret;
 	}
 	reg |= BIT(8);
 	ret = wilc_spi_write_reg(wilc, WILC_PIN_MUX_0, reg);
-	if (!ret) {
+	if (ret) {
 		dev_err(&spi->dev, "Failed write reg (%08x)...\n",
 			WILC_PIN_MUX_0);
-		return 0;
+		return ret;
 	}
 
 	/*
 	 * interrupt enable
 	 */
 	ret = wilc_spi_read_reg(wilc, WILC_INTR_ENABLE, &reg);
-	if (!ret) {
+	if (ret) {
 		dev_err(&spi->dev, "Failed read reg (%08x)...\n",
 			WILC_INTR_ENABLE);
-		return 0;
+		return ret;
 	}
 
 	for (i = 0; (i < 5) && (nint > 0); i++, nint--)
 		reg |= (BIT((27 + i)));
 
 	ret = wilc_spi_write_reg(wilc, WILC_INTR_ENABLE, reg);
-	if (!ret) {
+	if (ret) {
 		dev_err(&spi->dev, "Failed write reg (%08x)...\n",
 			WILC_INTR_ENABLE);
-		return 0;
+		return ret;
 	}
 	if (nint) {
 		ret = wilc_spi_read_reg(wilc, WILC_INTR2_ENABLE, &reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&spi->dev, "Failed read reg (%08x)...\n",
 				WILC_INTR2_ENABLE);
-			return 0;
+			return ret;
 		}
 
 		for (i = 0; (i < 3) && (nint > 0); i++, nint--)
 			reg |= BIT(i);
 
 		ret = wilc_spi_read_reg(wilc, WILC_INTR2_ENABLE, &reg);
-		if (!ret) {
+		if (ret) {
 			dev_err(&spi->dev, "Failed write reg (%08x)...\n",
 				WILC_INTR2_ENABLE);
-			return 0;
+			return ret;
 		}
 	}
 
-	return 1;
+	return 0;
 }
 
 /* Global spi HIF function table */

drivers/staging/wilc1000/wlan.c

@@ -534,7 +534,7 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 	func = wilc->hif_func;
 	do {
 		ret = func->hif_read_reg(wilc, WILC_HOST_TX_CTRL, &reg);
-		if (!ret)
+		if (ret)
 			break;
 
 		if ((reg & 0x1) == 0)
@@ -548,7 +548,7 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 		}
 	} while (!wilc->quit);
 
-	if (!ret)
+	if (ret)
 		goto out_release_bus;
 
 	timeout = 200;
@@ -557,16 +557,16 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 					 WILC_VMM_TBL_RX_SHADOW_BASE,
 					 (u8 *)vmm_table,
 					 ((i + 1) * 4));
-		if (!ret)
+		if (ret)
 			break;
 
 		ret = func->hif_write_reg(wilc, WILC_HOST_VMM_CTL, 0x2);
-		if (!ret)
+		if (ret)
 			break;
 
 		do {
 			ret = func->hif_read_reg(wilc, WILC_HOST_VMM_CTL, &reg);
-			if (!ret)
+			if (ret)
 				break;
 			if ((reg >> 2) & 0x1) {
 				entries = ((reg >> 3) & 0x3f);
@@ -579,19 +579,19 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 			break;
 		}
 
-		if (!ret)
+		if (ret)
 			break;
 
 		if (entries == 0) {
 			ret = func->hif_read_reg(wilc, WILC_HOST_TX_CTRL, &reg);
-			if (!ret)
+			if (ret)
 				break;
 			reg &= ~BIT(0);
 			ret = func->hif_write_reg(wilc, WILC_HOST_TX_CTRL, reg);
 		}
 	} while (0);
 
-	if (!ret)
+	if (ret)
 		goto out_release_bus;
 
 	if (entries == 0) {
@@ -654,7 +654,7 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 	acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 
 	ret = func->hif_clear_int_ext(wilc, ENABLE_TX_VMM);
-	if (!ret)
+	if (ret)
 		goto out_release_bus;
 
 	ret = func->hif_block_tx_ext(wilc, 0, txb, offset);
@@ -771,7 +771,7 @@ static void wilc_wlan_handle_isr_ext(struct wilc *wilc, u32 int_status)
 
 	wilc->hif_func->hif_clear_int_ext(wilc, DATA_INT_CLR | ENABLE_RX_VMM);
 	ret = wilc->hif_func->hif_block_rx_ext(wilc, 0, buffer, size);
-	if (!ret)
+	if (ret)
 		return;
 
 	offset += size;
@@ -832,7 +832,7 @@ int wilc_wlan_firmware_download(struct wilc *wilc, const u8 *buffer,
 			memcpy(dma_buffer, &buffer[offset], size2);
 			ret = wilc->hif_func->hif_block_tx(wilc, addr,
 							   dma_buffer, size2);
-			if (!ret)
+			if (ret)
 				break;
 
 			addr += size2;
@@ -841,17 +841,15 @@ int wilc_wlan_firmware_download(struct wilc *wilc, const u8 *buffer,
 		}
 		release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 
-		if (!ret) {
-			ret = -EIO;
+		if (ret)
 			goto fail;
-		}
 	} while (offset < buffer_size);
 
 fail:
 
 	kfree(dma_buffer);
 
-	return (ret < 0) ? ret : 0;
+	return ret;
 }
 
 int wilc_wlan_start(struct wilc *wilc)
@@ -868,26 +866,26 @@ int wilc_wlan_start(struct wilc *wilc)
 	}
 	acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_VMM_CORE_CFG, reg);
-	if (!ret) {
+	if (ret) {
 		release_bus(wilc, WILC_BUS_RELEASE_ONLY);
-		return -EIO;
+		return ret;
 	}
 	reg = 0;
 	if (wilc->io_type == WILC_HIF_SDIO && wilc->dev_irq_num)
 		reg |= WILC_HAVE_SDIO_IRQ_GPIO;
 
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_1, reg);
-	if (!ret) {
+	if (ret) {
 		release_bus(wilc, WILC_BUS_RELEASE_ONLY);
-		return -EIO;
+		return ret;
 	}
 
 	wilc->hif_func->hif_sync_ext(wilc, NUM_INT_EXT);
 
 	ret = wilc->hif_func->hif_read_reg(wilc, 0x1000, &chipid);
-	if (!ret) {
+	if (ret) {
 		release_bus(wilc, WILC_BUS_RELEASE_ONLY);
-		return -EIO;
+		return ret;
 	}
 
 	wilc->hif_func->hif_read_reg(wilc, WILC_GLB_RESET_0, &reg);
@@ -902,7 +900,7 @@ int wilc_wlan_start(struct wilc *wilc)
 	wilc->hif_func->hif_read_reg(wilc, WILC_GLB_RESET_0, &reg);
 	release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 
-	return (ret < 0) ? ret : 0;
+	return ret;
 }
 
 int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
@@ -913,33 +911,33 @@ int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
 	acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 
 	ret = wilc->hif_func->hif_read_reg(wilc, WILC_GP_REG_0, &reg);
-	if (!ret) {
+	if (ret) {
 		netdev_err(vif->ndev, "Error while reading reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return -EIO;
+		return ret;
 	}
 
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_0,
 					(reg | WILC_ABORT_REQ_BIT));
-	if (!ret) {
+	if (ret) {
 		netdev_err(vif->ndev, "Error while writing reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return -EIO;
+		return ret;
 	}
 
 	ret = wilc->hif_func->hif_read_reg(wilc, WILC_FW_HOST_COMM, &reg);
-	if (!ret) {
+	if (ret) {
 		netdev_err(vif->ndev, "Error while reading reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return -EIO;
+		return ret;
 	}
 	reg = BIT(0);
 
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_FW_HOST_COMM, reg);
-	if (!ret) {
+	if (ret) {
 		netdev_err(vif->ndev, "Error while writing reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return -EIO;
+		return ret;
 	}
 
 	release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
@@ -1112,10 +1110,11 @@ int wilc_send_config_pkt(struct wilc_vif *vif, u8 mode, struct wid *wids,
 	return ret;
 }
 
-static u32 init_chip(struct net_device *dev)
+static int init_chip(struct net_device *dev)
 {
 	u32 chipid;
-	u32 reg, ret = 0;
+	u32 reg;
+	int ret = 0;
 	struct wilc_vif *vif = netdev_priv(dev);
 	struct wilc *wilc = vif->wilc;
 
@@ -1125,18 +1124,18 @@ static u32 init_chip(struct net_device *dev)
 
 	if ((chipid & 0xfff) != 0xa0) {
 		ret = wilc->hif_func->hif_read_reg(wilc, 0x1118, &reg);
-		if (!ret) {
+		if (ret) {
 			netdev_err(dev, "fail read reg 0x1118\n");
 			goto release;
 		}
 		reg |= BIT(0);
 		ret = wilc->hif_func->hif_write_reg(wilc, 0x1118, reg);
-		if (!ret) {
+		if (ret) {
 			netdev_err(dev, "fail write reg 0x1118\n");
 			goto release;
 		}
 		ret = wilc->hif_func->hif_write_reg(wilc, 0xc0000, 0x71);
-		if (!ret) {
+		if (ret) {
 			netdev_err(dev, "fail write reg 0xc0000\n");
 			goto release;
 		}
@@ -1186,7 +1185,7 @@ int wilc_wlan_init(struct net_device *dev)
 
 	wilc->quit = 0;
 
-	if (!wilc->hif_func->hif_init(wilc, false)) {
+	if (wilc->hif_func->hif_init(wilc, false)) {
 		ret = -EIO;
 		goto fail;
 	}
@@ -1207,12 +1206,12 @@ int wilc_wlan_init(struct net_device *dev)
 		goto fail;
 	}
 
-	if (!init_chip(dev)) {
+	if (init_chip(dev)) {
 		ret = -EIO;
 		goto fail;
 	}
 
-	return 1;
+	return 0;
 
 fail: