Merge branch 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:
 "I2C has a smaller pull reuest this time:

   - new driver for I2C virtio

   - removal of PMC SMP driver because platform is already gone

   - IRQ probing and DMAENGINE API cleanups

   - add SI metric prefix definitions to units.h

   - beginning of i801 refactorization

   - a few driver improvements"

* 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (28 commits)
  i2c: cadence: Implement save restore
  i2c: xlp9xx: fix main IRQ check
  i2c: mt65xx: fix IRQ check
  i2c: virtio: add a virtio i2c frontend driver
  i2c: hix5hd2: fix IRQ check
  i2c: s3c2410: fix IRQ check
  i2c: iop3xx: fix deferred probing
  i2c: synquacer: fix deferred probing
  i2c: sun6i-pw2i: Prefer strscpy over strlcpy
  i2c: remove dead PMC MSP TWI/SMBus/I2C driver
  i2c: dev: Use sysfs_emit() in "show" functions
  i2c: dev: Define pr_fmt() and drop duplication substrings
  i2c: designware: Fix indentation in the header
  i2c: designware: Use DIV_ROUND_CLOSEST() macro
  units: Add SI metric prefix definitions
  i2c: at91: mark PM ops as __maybe unused
  i2c: sh_mobile: : use proper DMAENGINE API for termination
  i2c: qup: : use proper DMAENGINE API for termination
  i2c: mxs: : use proper DMAENGINE API for termination
  i2c: imx: : use proper DMAENGINE API for termination
  ...

MAINTAINERS

@@ -19736,6 +19736,15 @@ S:	Maintained
 F:	include/uapi/linux/virtio_snd.h
 F:	sound/virtio/*
 
+VIRTIO I2C DRIVER
+M:	Jie Deng <jie.deng@intel.com>
+M:	Viresh Kumar <viresh.kumar@linaro.org>
+L:	linux-i2c@vger.kernel.org
+L:	virtualization@lists.linux-foundation.org
+S:	Maintained
+F:	drivers/i2c/busses/i2c-virtio.c
+F:	include/uapi/linux/virtio_i2c.h
+
 VIRTUAL BOX GUEST DEVICE DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
 M:	Arnd Bergmann <arnd@arndb.de>

drivers/i2c/busses/Kconfig

@@ -866,15 +866,6 @@ config I2C_PCA_PLATFORM
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-pca-platform.
 
-config I2C_PMCMSP
-	tristate "PMC MSP I2C TWI Controller"
-	depends on PMC_MSP || COMPILE_TEST
-	help
-	  This driver supports the PMC TWI controller on MSP devices.
-
-	  This driver can also be built as module. If so, the module
-	  will be called i2c-pmcmsp.
-
 config I2C_PNX
 	tristate "I2C bus support for Philips PNX and NXP LPC targets"
 	depends on ARCH_LPC32XX || COMPILE_TEST
@@ -1402,4 +1393,15 @@ config I2C_FSI
 	  This driver can also be built as a module. If so, the module will be
 	  called as i2c-fsi.
 
+config I2C_VIRTIO
+        tristate "Virtio I2C Adapter"
+        select VIRTIO
+        help
+          If you say yes to this option, support will be included for the virtio
+          I2C adapter driver. The hardware can be emulated by any device model
+          software according to the virtio protocol.
+
+          This driver can also be built as a module. If so, the module
+          will be called i2c-virtio.
+
 endmenu

drivers/i2c/busses/Makefile

@@ -86,7 +86,6 @@ obj-$(CONFIG_I2C_OMAP)		+= i2c-omap.o
 obj-$(CONFIG_I2C_OWL)		+= i2c-owl.o
 obj-$(CONFIG_I2C_PASEMI)	+= i2c-pasemi.o
 obj-$(CONFIG_I2C_PCA_PLATFORM)	+= i2c-pca-platform.o
-obj-$(CONFIG_I2C_PMCMSP)	+= i2c-pmcmsp.o
 obj-$(CONFIG_I2C_PNX)		+= i2c-pnx.o
 obj-$(CONFIG_I2C_PXA)		+= i2c-pxa.o
 obj-$(CONFIG_I2C_PXA_PCI)	+= i2c-pxa-pci.o
@@ -146,5 +145,6 @@ obj-$(CONFIG_I2C_SIBYTE)	+= i2c-sibyte.o
 obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o
 obj-$(CONFIG_SCx200_ACB)	+= scx200_acb.o
 obj-$(CONFIG_I2C_FSI)		+= i2c-fsi.o
+obj-$(CONFIG_I2C_VIRTIO)	+= i2c-virtio.o
 
 ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG

drivers/i2c/busses/i2c-at91-core.c

@@ -286,9 +286,7 @@ static int at91_twi_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-
-static int at91_twi_runtime_suspend(struct device *dev)
+static int __maybe_unused at91_twi_runtime_suspend(struct device *dev)
 {
 	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
 
@@ -299,7 +297,7 @@ static int at91_twi_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int at91_twi_runtime_resume(struct device *dev)
+static int __maybe_unused at91_twi_runtime_resume(struct device *dev)
 {
 	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
 
@@ -308,7 +306,7 @@ static int at91_twi_runtime_resume(struct device *dev)
 	return clk_prepare_enable(twi_dev->clk);
 }
 
-static int at91_twi_suspend_noirq(struct device *dev)
+static int __maybe_unused at91_twi_suspend_noirq(struct device *dev)
 {
 	if (!pm_runtime_status_suspended(dev))
 		at91_twi_runtime_suspend(dev);
@@ -316,7 +314,7 @@ static int at91_twi_suspend_noirq(struct device *dev)
 	return 0;
 }
 
-static int at91_twi_resume_noirq(struct device *dev)
+static int __maybe_unused at91_twi_resume_noirq(struct device *dev)
 {
 	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
 	int ret;
@@ -335,18 +333,13 @@ static int at91_twi_resume_noirq(struct device *dev)
 	return 0;
 }
 
-static const struct dev_pm_ops at91_twi_pm = {
+static const struct dev_pm_ops __maybe_unused at91_twi_pm = {
 	.suspend_noirq	= at91_twi_suspend_noirq,
 	.resume_noirq	= at91_twi_resume_noirq,
 	.runtime_suspend	= at91_twi_runtime_suspend,
 	.runtime_resume		= at91_twi_runtime_resume,
 };
 
-#define at91_twi_pm_ops (&at91_twi_pm)
-#else
-#define at91_twi_pm_ops NULL
-#endif
-
 static struct platform_driver at91_twi_driver = {
 	.probe		= at91_twi_probe,
 	.remove		= at91_twi_remove,
@@ -354,7 +347,7 @@ static struct platform_driver at91_twi_driver = {
 	.driver		= {
 		.name	= "at91_i2c",
 		.of_match_table = of_match_ptr(atmel_twi_dt_ids),
-		.pm	= at91_twi_pm_ops,
+		.pm	= pm_ptr(&at91_twi_pm),
 	},
 };
 

drivers/i2c/busses/i2c-at91-master.c

@@ -138,9 +138,9 @@ static void at91_twi_dma_cleanup(struct at91_twi_dev *dev)
 
 	if (dma->xfer_in_progress) {
 		if (dma->direction == DMA_FROM_DEVICE)
-			dmaengine_terminate_all(dma->chan_rx);
+			dmaengine_terminate_sync(dma->chan_rx);
 		else
-			dmaengine_terminate_all(dma->chan_tx);
+			dmaengine_terminate_sync(dma->chan_tx);
 		dma->xfer_in_progress = false;
 	}
 	if (dma->buf_mapped) {

drivers/i2c/busses/i2c-cadence.c

@@ -178,6 +178,7 @@ enum cdns_i2c_slave_state {
  * @clk:		Pointer to struct clk
  * @clk_rate_change_nb:	Notifier block for clock rate changes
  * @quirks:		flag for broken hold bit usage in r1p10
+ * @ctrl_reg:		Cached value of the control register.
  * @ctrl_reg_diva_divb: value of fields DIV_A and DIV_B from CR register
  * @slave:		Registered slave instance.
  * @dev_mode:		I2C operating role(master/slave).
@@ -202,6 +203,7 @@ struct cdns_i2c {
 	struct clk *clk;
 	struct notifier_block clk_rate_change_nb;
 	u32 quirks;
+	u32 ctrl_reg;
 #if IS_ENABLED(CONFIG_I2C_SLAVE)
 	u16 ctrl_reg_diva_divb;
 	struct i2c_client *slave;
@@ -1071,10 +1073,11 @@ static int cdns_i2c_setclk(unsigned long clk_in, struct cdns_i2c *id)
 	if (ret)
 		return ret;
 
-	ctrl_reg = cdns_i2c_readreg(CDNS_I2C_CR_OFFSET);
+	ctrl_reg = id->ctrl_reg;
 	ctrl_reg &= ~(CDNS_I2C_CR_DIVA_MASK | CDNS_I2C_CR_DIVB_MASK);
 	ctrl_reg |= ((div_a << CDNS_I2C_CR_DIVA_SHIFT) |
 			(div_b << CDNS_I2C_CR_DIVB_SHIFT));
+	id->ctrl_reg = ctrl_reg;
 	cdns_i2c_writereg(ctrl_reg, CDNS_I2C_CR_OFFSET);
 #if IS_ENABLED(CONFIG_I2C_SLAVE)
 	id->ctrl_reg_diva_divb = ctrl_reg & (CDNS_I2C_CR_DIVA_MASK |
@@ -1162,6 +1165,26 @@ static int __maybe_unused cdns_i2c_runtime_suspend(struct device *dev)
 	return 0;
 }
 
+/**
+ * cdns_i2c_init -  Controller initialisation
+ * @id:		Device private data structure
+ *
+ * Initialise the i2c controller.
+ *
+ */
+static void cdns_i2c_init(struct cdns_i2c *id)
+{
+	cdns_i2c_writereg(id->ctrl_reg, CDNS_I2C_CR_OFFSET);
+	/*
+	 * Cadence I2C controller has a bug wherein it generates
+	 * invalid read transaction after HW timeout in master receiver mode.
+	 * HW timeout is not used by this driver and the interrupt is disabled.
+	 * But the feature itself cannot be disabled. Hence maximum value
+	 * is written to this register to reduce the chances of error.
+	 */
+	cdns_i2c_writereg(CDNS_I2C_TIMEOUT_MAX, CDNS_I2C_TIME_OUT_OFFSET);
+}
+
 /**
  * cdns_i2c_runtime_resume - Runtime resume
  * @dev:	Address of the platform_device structure
@@ -1180,6 +1203,7 @@ static int __maybe_unused cdns_i2c_runtime_resume(struct device *dev)
 		dev_err(dev, "Cannot enable clock.\n");
 		return ret;
 	}
+	cdns_i2c_init(xi2c);
 
 	return 0;
 }
@@ -1279,7 +1303,7 @@ static int cdns_i2c_probe(struct platform_device *pdev)
 	id->dev_mode = CDNS_I2C_MODE_MASTER;
 	id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;
 #endif
-	cdns_i2c_writereg(CDNS_I2C_CR_MASTER_EN_MASK, CDNS_I2C_CR_OFFSET);
+	id->ctrl_reg = CDNS_I2C_CR_ACK_EN | CDNS_I2C_CR_NEA | CDNS_I2C_CR_MS;
 
 	ret = cdns_i2c_setclk(id->input_clk, id);
 	if (ret) {
@@ -1294,15 +1318,7 @@ static int cdns_i2c_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "cannot get irq %d\n", id->irq);
 		goto err_clk_dis;
 	}
-
-	/*
-	 * Cadence I2C controller has a bug wherein it generates
-	 * invalid read transaction after HW timeout in master receiver mode.
-	 * HW timeout is not used by this driver and the interrupt is disabled.
-	 * But the feature itself cannot be disabled. Hence maximum value
-	 * is written to this register to reduce the chances of error.
-	 */
-	cdns_i2c_writereg(CDNS_I2C_TIMEOUT_MAX, CDNS_I2C_TIME_OUT_OFFSET);
+	cdns_i2c_init(id);
 
 	ret = i2c_add_adapter(&id->adap);
 	if (ret < 0)

drivers/i2c/busses/i2c-designware-common.c

@@ -24,6 +24,7 @@
 #include <linux/regmap.h>
 #include <linux/swab.h>
 #include <linux/types.h>
+#include <linux/units.h>
 
 #include "i2c-designware-core.h"
 
@@ -350,7 +351,7 @@ u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
 		 *
 		 * If your hardware is free from tHD;STA issue, try this one.
 		 */
-		return (ic_clk * tSYMBOL + 500000) / 1000000 - 8 + offset;
+		return DIV_ROUND_CLOSEST(ic_clk * tSYMBOL, MICRO) - 8 + offset;
 	else
 		/*
 		 * Conditional expression:
@@ -366,8 +367,7 @@ u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
 		 * The reason why we need to take into account "tf" here,
 		 * is the same as described in i2c_dw_scl_lcnt().
 		 */
-		return (ic_clk * (tSYMBOL + tf) + 500000) / 1000000
-			- 3 + offset;
+		return DIV_ROUND_CLOSEST(ic_clk * (tSYMBOL + tf), MICRO) - 3 + offset;
 }
 
 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
@@ -383,7 +383,7 @@ u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
 	 * account the fall time of SCL signal (tf).  Default tf value
 	 * should be 0.3 us, for safety.
 	 */
-	return ((ic_clk * (tLOW + tf) + 500000) / 1000000) - 1 + offset;
+	return DIV_ROUND_CLOSEST(ic_clk * (tLOW + tf), MICRO) - 1 + offset;
 }
 
 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)

drivers/i2c/busses/i2c-designware-core.h

@@ -117,7 +117,7 @@
 
 #define DW_IC_ERR_TX_ABRT	0x1
 
-#define DW_IC_TAR_10BITADDR_MASTER BIT(12)
+#define DW_IC_TAR_10BITADDR_MASTER	BIT(12)
 
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH	(BIT(2) | BIT(3))
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK	GENMASK(3, 2)
@@ -245,7 +245,7 @@ struct dw_i2c_dev {
 	struct clk		*clk;
 	struct clk		*pclk;
 	struct reset_control	*rst;
-	struct i2c_client		*slave;
+	struct i2c_client	*slave;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
 	int			cmd_err;
 	struct i2c_msg		*msgs;

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -31,12 +31,13 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
+#include <linux/units.h>
 
 #include "i2c-designware-core.h"
 
 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
-	return clk_get_rate(dev->clk)/1000;
+	return clk_get_rate(dev->clk) / KILO;
 }
 
 #ifdef CONFIG_ACPI
@@ -270,7 +271,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 
 		if (!dev->sda_hold_time && t->sda_hold_ns)
 			dev->sda_hold_time =
-				div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
+				DIV_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);
 	}
 
 	adap = &dev->adapter;

drivers/i2c/busses/i2c-highlander.c

@@ -379,7 +379,7 @@ static int highlander_i2c_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, dev);
 
 	dev->irq = platform_get_irq(pdev, 0);
-	if (iic_force_poll)
+	if (dev->irq < 0 || iic_force_poll)
 		dev->irq = 0;
 
 	if (dev->irq) {

drivers/i2c/busses/i2c-hix5hd2.c

@@ -413,7 +413,7 @@ static int hix5hd2_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->regs);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0)
 		return irq;
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);

drivers/i2c/busses/i2c-i801.c

@@ -110,6 +110,7 @@
 #include <linux/platform_device.h>
 #include <linux/platform_data/itco_wdt.h>
 #include <linux/pm_runtime.h>
+#include <linux/mutex.h>
 
 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 #include <linux/gpio/machine.h>
@@ -503,19 +504,16 @@ static int i801_transaction(struct i801_priv *priv, int xact)
 
 static int i801_block_transaction_by_block(struct i801_priv *priv,
 					   union i2c_smbus_data *data,
-					   char read_write, int command,
-					   int hwpec)
+					   char read_write, int command)
 {
-	int i, len;
-	int status;
-	int xact = hwpec ? SMBHSTCNT_PEC_EN : 0;
+	int i, len, status, xact;
 
 	switch (command) {
 	case I2C_SMBUS_BLOCK_PROC_CALL:
-		xact |= I801_BLOCK_PROC_CALL;
+		xact = I801_BLOCK_PROC_CALL;
 		break;
 	case I2C_SMBUS_BLOCK_DATA:
-		xact |= I801_BLOCK_DATA;
+		xact = I801_BLOCK_DATA;
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -561,10 +559,6 @@ static void i801_isr_byte_done(struct i801_priv *priv)
 					priv->len);
 				/* FIXME: Recover */
 				priv->len = I2C_SMBUS_BLOCK_MAX;
-			} else {
-				dev_dbg(&priv->pci_dev->dev,
-					"SMBus block read size is %d\n",
-					priv->len);
 			}
 			priv->data[-1] = priv->len;
 		}
@@ -665,8 +659,7 @@ static irqreturn_t i801_isr(int irq, void *dev_id)
  */
 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
 					       union i2c_smbus_data *data,
-					       char read_write, int command,
-					       int hwpec)
+					       char read_write, int command)
 {
 	int i, len;
 	int smbcmd;
@@ -764,9 +757,8 @@ static int i801_set_block_buffer_mode(struct i801_priv *priv)
 }
 
 /* Block transaction function */
-static int i801_block_transaction(struct i801_priv *priv,
-				  union i2c_smbus_data *data, char read_write,
-				  int command, int hwpec)
+static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
+				  char read_write, int command)
 {
 	int result = 0;
 	unsigned char hostc;
@@ -802,11 +794,11 @@ static int i801_block_transaction(struct i801_priv *priv,
 	 && i801_set_block_buffer_mode(priv) == 0)
 		result = i801_block_transaction_by_block(priv, data,
 							 read_write,
-							 command, hwpec);
+							 command);
 	else
 		result = i801_block_transaction_byte_by_byte(priv, data,
 							     read_write,
-							     command, hwpec);
+							     command);
 
 	if (command == I2C_SMBUS_I2C_BLOCK_DATA
 	 && read_write == I2C_SMBUS_WRITE) {
@@ -917,8 +909,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
 		       SMBAUXCTL(priv));
 
 	if (block)
-		ret = i801_block_transaction(priv, data, read_write, size,
-					     hwpec);
+		ret = i801_block_transaction(priv, data, read_write, size);
 	else
 		ret = i801_transaction(priv, xact);
 
@@ -1498,12 +1489,11 @@ static const struct itco_wdt_platform_data spt_tco_platform_data = {
 	.version = 4,
 };
 
-static DEFINE_SPINLOCK(p2sb_spinlock);
-
 static struct platform_device *
 i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
 		 struct resource *tco_res)
 {
+	static DEFINE_MUTEX(p2sb_mutex);
 	struct resource *res;
 	unsigned int devfn;
 	u64 base64_addr;
@@ -1516,7 +1506,7 @@ i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
 	 * enumerated by the PCI subsystem, so we need to unhide/hide it
 	 * to lookup the P2SB BAR.
 	 */
-	spin_lock(&p2sb_spinlock);
+	mutex_lock(&p2sb_mutex);
 
 	devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
 
@@ -1534,7 +1524,7 @@ i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
 	/* Hide the P2SB device, if it was hidden before */
 	if (hidden)
 		pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
-	spin_unlock(&p2sb_spinlock);
+	mutex_unlock(&p2sb_mutex);
 
 	res = &tco_res[1];
 	if (pci_dev->device == PCI_DEVICE_ID_INTEL_DNV_SMBUS)
@@ -1634,7 +1624,7 @@ i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
 		 * BIOS is accessing the host controller so prevent it from
 		 * suspending automatically from now on.
 		 */
-		pm_runtime_get_sync(&pdev->dev);
+		pm_runtime_set_autosuspend_delay(&pdev->dev, -1);
 	}
 
 	if ((function & ACPI_IO_MASK) == ACPI_READ)
@@ -1674,11 +1664,6 @@ static void i801_acpi_remove(struct i801_priv *priv)
 
 	acpi_remove_address_space_handler(adev->handle,
 		ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
-
-	mutex_lock(&priv->acpi_lock);
-	if (priv->acpi_reserved)
-		pm_runtime_put(&priv->pci_dev->dev);
-	mutex_unlock(&priv->acpi_lock);
 }
 #else
 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
@@ -1690,6 +1675,7 @@ static void i801_setup_hstcfg(struct i801_priv *priv)
 	unsigned char hstcfg = priv->original_hstcfg;
 
 	hstcfg &= ~SMBHSTCFG_I2C_EN;	/* SMBus timing */
+	hstcfg &= ~SMBHSTCNT_PEC_EN;	/* Disable software PEC */
 	hstcfg |= SMBHSTCFG_HST_EN;
 	pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hstcfg);
 }

drivers/i2c/busses/i2c-imx.c

@@ -423,7 +423,7 @@ static int i2c_imx_dma_xfer(struct imx_i2c_struct *i2c_imx,
 	return 0;
 
 err_submit:
-	dmaengine_terminate_all(dma->chan_using);
+	dmaengine_terminate_sync(dma->chan_using);
 err_desc:
 	dma_unmap_single(chan_dev, dma->dma_buf,
 			dma->dma_len, dma->dma_data_dir);
@@ -894,7 +894,7 @@ static int i2c_imx_dma_write(struct imx_i2c_struct *i2c_imx,
 				&i2c_imx->dma->cmd_complete,
 				msecs_to_jiffies(DMA_TIMEOUT));
 	if (time_left == 0) {
-		dmaengine_terminate_all(dma->chan_using);
+		dmaengine_terminate_sync(dma->chan_using);
 		return -ETIMEDOUT;
 	}
 
@@ -949,7 +949,7 @@ static int i2c_imx_dma_read(struct imx_i2c_struct *i2c_imx,
 				&i2c_imx->dma->cmd_complete,
 				msecs_to_jiffies(DMA_TIMEOUT));
 	if (time_left == 0) {
-		dmaengine_terminate_all(dma->chan_using);
+		dmaengine_terminate_sync(dma->chan_using);
 		return -ETIMEDOUT;
 	}
 

drivers/i2c/busses/i2c-iop3xx.c

@@ -469,16 +469,14 @@ iop3xx_i2c_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		ret = -ENXIO;
+		ret = irq;
 		goto unmap;
 	}
 	ret = request_irq(irq, iop3xx_i2c_irq_handler, 0,
 				pdev->name, adapter_data);
 
-	if (ret) {
-		ret = -EIO;
+	if (ret)
 		goto unmap;
-	}
 
 	memcpy(new_adapter->name, pdev->name, strlen(pdev->name));
 	new_adapter->owner = THIS_MODULE;

drivers/i2c/busses/i2c-mt65xx.c

@@ -1211,7 +1211,7 @@ static int mtk_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(i2c->pdmabase);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0)
 		return irq;
 
 	init_completion(&i2c->msg_complete);

drivers/i2c/busses/i2c-mxs.c

@@ -290,14 +290,14 @@ static int mxs_i2c_dma_setup_xfer(struct i2c_adapter *adap,
 select_init_dma_fail:
 	dma_unmap_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE);
 select_init_pio_fail:
-	dmaengine_terminate_all(i2c->dmach);
+	dmaengine_terminate_sync(i2c->dmach);
 	return -EINVAL;
 
 /* Write failpath. */
 write_init_dma_fail:
 	dma_unmap_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE);
 write_init_pio_fail:
-	dmaengine_terminate_all(i2c->dmach);
+	dmaengine_terminate_sync(i2c->dmach);
 	return -EINVAL;
 }
 

drivers/i2c/busses/i2c-parport.c

@@ -267,6 +267,16 @@ static void i2c_parport_attach(struct parport *port)
 	int i;
 	struct pardev_cb i2c_parport_cb;
 
+	if (type < 0) {
+		pr_warn("adapter type unspecified\n");
+		return;
+	}
+
+	if (type >= ARRAY_SIZE(adapter_parm)) {
+		pr_warn("invalid type (%d)\n", type);
+		return;
+	}
+
 	for (i = 0; i < MAX_DEVICE; i++) {
 		if (parport[i] == -1)
 			continue;
@@ -392,32 +402,8 @@ static struct parport_driver i2c_parport_driver = {
 	.detach = i2c_parport_detach,
 	.devmodel = true,
 };
-
-/* ----- Module loading, unloading and information ------------------------ */
-
-static int __init i2c_parport_init(void)
-{
-	if (type < 0) {
-		pr_warn("adapter type unspecified\n");
-		return -ENODEV;
-	}
-
-	if (type >= ARRAY_SIZE(adapter_parm)) {
-		pr_warn("invalid type (%d)\n", type);
-		return -ENODEV;
-	}
-
-	return parport_register_driver(&i2c_parport_driver);
-}
-
-static void __exit i2c_parport_exit(void)
-{
-	parport_unregister_driver(&i2c_parport_driver);
-}
+module_parport_driver(i2c_parport_driver);
 
 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 MODULE_DESCRIPTION("I2C bus over parallel port");
 MODULE_LICENSE("GPL");
-
-module_init(i2c_parport_init);
-module_exit(i2c_parport_exit);

drivers/i2c/busses/i2c-qup.c

@@ -778,7 +778,7 @@ static int qup_i2c_bam_schedule_desc(struct qup_i2c_dev *qup)
 			ret = -EINVAL;
 
 			/* abort TX descriptors */
-			dmaengine_terminate_all(qup->btx.dma);
+			dmaengine_terminate_sync(qup->btx.dma);
 			goto desc_err;
 		}
 

drivers/i2c/busses/i2c-s3c2410.c

@@ -1137,7 +1137,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	 */
 	if (!(i2c->quirks & QUIRK_POLL)) {
 		i2c->irq = ret = platform_get_irq(pdev, 0);
-		if (ret <= 0) {
+		if (ret < 0) {
 			dev_err(&pdev->dev, "cannot find IRQ\n");
 			clk_unprepare(i2c->clk);
 			return ret;

drivers/i2c/busses/i2c-sh_mobile.c

@@ -458,9 +458,9 @@ static void sh_mobile_i2c_cleanup_dma(struct sh_mobile_i2c_data *pd)
 	if (pd->dma_direction == DMA_NONE)
 		return;
 	else if (pd->dma_direction == DMA_FROM_DEVICE)
-		dmaengine_terminate_all(pd->dma_rx);
+		dmaengine_terminate_sync(pd->dma_rx);
 	else if (pd->dma_direction == DMA_TO_DEVICE)
-		dmaengine_terminate_all(pd->dma_tx);
+		dmaengine_terminate_sync(pd->dma_tx);
 
 	sh_mobile_i2c_dma_unmap(pd);
 }

drivers/i2c/busses/i2c-sun6i-p2wi.c

@@ -234,7 +234,7 @@ static int p2wi_probe(struct platform_device *pdev)
 	if (IS_ERR(p2wi->regs))
 		return PTR_ERR(p2wi->regs);
 
-	strlcpy(p2wi->adapter.name, pdev->name, sizeof(p2wi->adapter.name));
+	strscpy(p2wi->adapter.name, pdev->name, sizeof(p2wi->adapter.name));
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

drivers/i2c/busses/i2c-synquacer.c

@@ -578,7 +578,7 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 
 	i2c->irq = platform_get_irq(pdev, 0);
 	if (i2c->irq < 0)
-		return -ENODEV;
+		return i2c->irq;
 
 	ret = devm_request_irq(&pdev->dev, i2c->irq, synquacer_i2c_isr,
 			       0, dev_name(&pdev->dev), i2c);

drivers/i2c/busses/i2c-virtio.c

+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Virtio I2C Bus Driver
+ *
+ * The Virtio I2C Specification:
+ * https://raw.githubusercontent.com/oasis-tcs/virtio-spec/master/virtio-i2c.tex
+ *
+ * Copyright (c) 2021 Intel Corporation. All rights reserved.
+ */
+
+#include <linux/acpi.h>
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_i2c.h>
+
+/**
+ * struct virtio_i2c - virtio I2C data
+ * @vdev: virtio device for this controller
+ * @completion: completion of virtio I2C message
+ * @adap: I2C adapter for this controller
+ * @vq: the virtio virtqueue for communication
+ */
+struct virtio_i2c {
+	struct virtio_device *vdev;
+	struct completion completion;
+	struct i2c_adapter adap;
+	struct virtqueue *vq;
+};
+
+/**
+ * struct virtio_i2c_req - the virtio I2C request structure
+ * @out_hdr: the OUT header of the virtio I2C message
+ * @buf: the buffer into which data is read, or from which it's written
+ * @in_hdr: the IN header of the virtio I2C message
+ */
+struct virtio_i2c_req {
+	struct virtio_i2c_out_hdr out_hdr	____cacheline_aligned;
+	uint8_t *buf				____cacheline_aligned;
+	struct virtio_i2c_in_hdr in_hdr		____cacheline_aligned;
+};
+
+static void virtio_i2c_msg_done(struct virtqueue *vq)
+{
+	struct virtio_i2c *vi = vq->vdev->priv;
+
+	complete(&vi->completion);
+}
+
+static int virtio_i2c_prepare_reqs(struct virtqueue *vq,
+				   struct virtio_i2c_req *reqs,
+				   struct i2c_msg *msgs, int num)
+{
+	struct scatterlist *sgs[3], out_hdr, msg_buf, in_hdr;
+	int i;
+
+	for (i = 0; i < num; i++) {
+		int outcnt = 0, incnt = 0;
+
+		/*
+		 * We don't support 0 length messages and so filter out
+		 * 0 length transfers by using i2c_adapter_quirks.
+		 */
+		if (!msgs[i].len)
+			break;
+
+		/*
+		 * Only 7-bit mode supported for this moment. For the address
+		 * format, Please check the Virtio I2C Specification.
+		 */
+		reqs[i].out_hdr.addr = cpu_to_le16(msgs[i].addr << 1);
+
+		if (i != num - 1)
+			reqs[i].out_hdr.flags = cpu_to_le32(VIRTIO_I2C_FLAGS_FAIL_NEXT);
+
+		sg_init_one(&out_hdr, &reqs[i].out_hdr, sizeof(reqs[i].out_hdr));
+		sgs[outcnt++] = &out_hdr;
+
+		reqs[i].buf = i2c_get_dma_safe_msg_buf(&msgs[i], 1);
+		if (!reqs[i].buf)
+			break;
+
+		sg_init_one(&msg_buf, reqs[i].buf, msgs[i].len);
+
+		if (msgs[i].flags & I2C_M_RD)
+			sgs[outcnt + incnt++] = &msg_buf;
+		else
+			sgs[outcnt++] = &msg_buf;
+
+		sg_init_one(&in_hdr, &reqs[i].in_hdr, sizeof(reqs[i].in_hdr));
+		sgs[outcnt + incnt++] = &in_hdr;
+
+		if (virtqueue_add_sgs(vq, sgs, outcnt, incnt, &reqs[i], GFP_KERNEL)) {
+			i2c_put_dma_safe_msg_buf(reqs[i].buf, &msgs[i], false);
+			break;
+		}
+	}
+
+	return i;
+}
+
+static int virtio_i2c_complete_reqs(struct virtqueue *vq,
+				    struct virtio_i2c_req *reqs,
+				    struct i2c_msg *msgs, int num,
+				    bool timedout)
+{
+	struct virtio_i2c_req *req;
+	bool failed = timedout;
+	unsigned int len;
+	int i, j = 0;
+
+	for (i = 0; i < num; i++) {
+		/* Detach the ith request from the vq */
+		req = virtqueue_get_buf(vq, &len);
+
+		/*
+		 * Condition req == &reqs[i] should always meet since we have
+		 * total num requests in the vq. reqs[i] can never be NULL here.
+		 */
+		if (!failed && (WARN_ON(req != &reqs[i]) ||
+				req->in_hdr.status != VIRTIO_I2C_MSG_OK))
+			failed = true;
+
+		i2c_put_dma_safe_msg_buf(reqs[i].buf, &msgs[i], !failed);
+
+		if (!failed)
+			j++;
+	}
+
+	return timedout ? -ETIMEDOUT : j;
+}
+
+static int virtio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+			   int num)
+{
+	struct virtio_i2c *vi = i2c_get_adapdata(adap);
+	struct virtqueue *vq = vi->vq;
+	struct virtio_i2c_req *reqs;
+	unsigned long time_left;
+	int count;
+
+	reqs = kcalloc(num, sizeof(*reqs), GFP_KERNEL);
+	if (!reqs)
+		return -ENOMEM;
+
+	count = virtio_i2c_prepare_reqs(vq, reqs, msgs, num);
+	if (!count)
+		goto err_free;
+
+	/*
+	 * For the case where count < num, i.e. we weren't able to queue all the
+	 * msgs, ideally we should abort right away and return early, but some
+	 * of the messages are already sent to the remote I2C controller and the
+	 * virtqueue will be left in undefined state in that case. We kick the
+	 * remote here to clear the virtqueue, so we can try another set of
+	 * messages later on.
+	 */
+
+	reinit_completion(&vi->completion);
+	virtqueue_kick(vq);
+
+	time_left = wait_for_completion_timeout(&vi->completion, adap->timeout);
+	if (!time_left)
+		dev_err(&adap->dev, "virtio i2c backend timeout.\n");
+
+	count = virtio_i2c_complete_reqs(vq, reqs, msgs, count, !time_left);
+
+err_free:
+	kfree(reqs);
+	return count;
+}
+
+static void virtio_i2c_del_vqs(struct virtio_device *vdev)
+{
+	vdev->config->reset(vdev);
+	vdev->config->del_vqs(vdev);
+}
+
+static int virtio_i2c_setup_vqs(struct virtio_i2c *vi)
+{
+	struct virtio_device *vdev = vi->vdev;
+
+	vi->vq = virtio_find_single_vq(vdev, virtio_i2c_msg_done, "msg");
+	return PTR_ERR_OR_ZERO(vi->vq);
+}
+
+static u32 virtio_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
+}
+
+static struct i2c_algorithm virtio_algorithm = {
+	.master_xfer = virtio_i2c_xfer,
+	.functionality = virtio_i2c_func,
+};
+
+static const struct i2c_adapter_quirks virtio_i2c_quirks = {
+	.flags = I2C_AQ_NO_ZERO_LEN,
+};
+
+static int virtio_i2c_probe(struct virtio_device *vdev)
+{
+	struct virtio_i2c *vi;
+	int ret;
+
+	vi = devm_kzalloc(&vdev->dev, sizeof(*vi), GFP_KERNEL);
+	if (!vi)
+		return -ENOMEM;
+
+	vdev->priv = vi;
+	vi->vdev = vdev;
+
+	init_completion(&vi->completion);
+
+	ret = virtio_i2c_setup_vqs(vi);
+	if (ret)
+		return ret;
+
+	vi->adap.owner = THIS_MODULE;
+	snprintf(vi->adap.name, sizeof(vi->adap.name),
+		 "i2c_virtio at virtio bus %d", vdev->index);
+	vi->adap.algo = &virtio_algorithm;
+	vi->adap.quirks = &virtio_i2c_quirks;
+	vi->adap.dev.parent = &vdev->dev;
+	vi->adap.dev.of_node = vdev->dev.of_node;
+	i2c_set_adapdata(&vi->adap, vi);
+
+	/*
+	 * Setup ACPI node for controlled devices which will be probed through
+	 * ACPI.
+	 */
+	ACPI_COMPANION_SET(&vi->adap.dev, ACPI_COMPANION(vdev->dev.parent));
+
+	ret = i2c_add_adapter(&vi->adap);
+	if (ret)
+		virtio_i2c_del_vqs(vdev);
+
+	return ret;
+}
+
+static void virtio_i2c_remove(struct virtio_device *vdev)
+{
+	struct virtio_i2c *vi = vdev->priv;
+
+	i2c_del_adapter(&vi->adap);
+	virtio_i2c_del_vqs(vdev);
+}
+
+static struct virtio_device_id id_table[] = {
+	{ VIRTIO_ID_I2C_ADAPTER, VIRTIO_DEV_ANY_ID },
+	{}
+};
+MODULE_DEVICE_TABLE(virtio, id_table);
+
+#ifdef CONFIG_PM_SLEEP
+static int virtio_i2c_freeze(struct virtio_device *vdev)
+{
+	virtio_i2c_del_vqs(vdev);
+	return 0;
+}
+
+static int virtio_i2c_restore(struct virtio_device *vdev)
+{
+	return virtio_i2c_setup_vqs(vdev->priv);
+}
+#endif
+
+static struct virtio_driver virtio_i2c_driver = {
+	.id_table	= id_table,
+	.probe		= virtio_i2c_probe,
+	.remove		= virtio_i2c_remove,
+	.driver	= {
+		.name	= "i2c_virtio",
+	},
+#ifdef CONFIG_PM_SLEEP
+	.freeze = virtio_i2c_freeze,
+	.restore = virtio_i2c_restore,
+#endif
+};
+module_virtio_driver(virtio_i2c_driver);
+
+MODULE_AUTHOR("Jie Deng <jie.deng@intel.com>");
+MODULE_AUTHOR("Conghui Chen <conghui.chen@intel.com>");
+MODULE_DESCRIPTION("Virtio i2c bus driver");
+MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-xlp9xx.c

@@ -517,7 +517,7 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->base);
 
 	priv->irq = platform_get_irq(pdev, 0);
-	if (priv->irq <= 0)
+	if (priv->irq < 0)
 		return priv->irq;
 	/* SMBAlert irq */
 	priv->alert_data.irq = platform_get_irq(pdev, 1);

drivers/i2c/i2c-dev.c

@@ -14,6 +14,8 @@
 
 /* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */
 
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
 #include <linux/cdev.h>
 #include <linux/compat.h>
 #include <linux/device.h>
@@ -68,8 +70,7 @@ static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
 	struct i2c_dev *i2c_dev;
 
 	if (adap->nr >= I2C_MINORS) {
-		printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n",
-		       adap->nr);
+		pr_err("Out of device minors (%d)\n", adap->nr);
 		return ERR_PTR(-ENODEV);
 	}
 
@@ -101,7 +102,7 @@ static ssize_t name_show(struct device *dev,
 
 	if (!i2c_dev)
 		return -ENODEV;
-	return sprintf(buf, "%s\n", i2c_dev->adap->name);
+	return sysfs_emit(buf, "%s\n", i2c_dev->adap->name);
 }
 static DEVICE_ATTR_RO(name);
 
@@ -145,8 +146,7 @@ static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
 	if (tmp == NULL)
 		return -ENOMEM;
 
-	pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
-		iminor(file_inode(file)), count);
+	pr_debug("i2c-%d reading %zu bytes.\n", iminor(file_inode(file)), count);
 
 	ret = i2c_master_recv(client, tmp, count);
 	if (ret >= 0)
@@ -170,8 +170,7 @@ static ssize_t i2cdev_write(struct file *file, const char __user *buf,
 	if (IS_ERR(tmp))
 		return PTR_ERR(tmp);
 
-	pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n",
-		iminor(file_inode(file)), count);
+	pr_debug("i2c-%d writing %zu bytes.\n", iminor(file_inode(file)), count);
 
 	ret = i2c_master_send(client, tmp, count);
 	kfree(tmp);
@@ -674,8 +673,7 @@ static int i2cdev_attach_adapter(struct device *dev, void *dummy)
 		return res;
 	}
 
-	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
-		 adap->name, adap->nr);
+	pr_debug("adapter [%s] registered as minor %d\n", adap->name, adap->nr);
 	return 0;
 }
 
@@ -694,7 +692,7 @@ static int i2cdev_detach_adapter(struct device *dev, void *dummy)
 
 	put_i2c_dev(i2c_dev, true);
 
-	pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
+	pr_debug("adapter [%s] unregistered\n", adap->name);
 	return 0;
 }
 
@@ -727,7 +725,7 @@ static int __init i2c_dev_init(void)
 {
 	int res;
 
-	printk(KERN_INFO "i2c /dev entries driver\n");
+	pr_info("i2c /dev entries driver\n");
 
 	res = register_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS, "i2c");
 	if (res)
@@ -755,7 +753,7 @@ static int __init i2c_dev_init(void)
 out_unreg_chrdev:
 	unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
 out:
-	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
+	pr_err("Driver Initialisation failed\n");
 	return res;
 }
 

include/linux/units.h

@@ -4,6 +4,22 @@
 
 #include <linux/math.h>
 
+/* Metric prefixes in accordance with Système international (d'unités) */
+#define PETA	1000000000000000ULL
+#define TERA	1000000000000ULL
+#define GIGA	1000000000UL
+#define MEGA	1000000UL
+#define KILO	1000UL
+#define HECTO	100UL
+#define DECA	10UL
+#define DECI	10UL
+#define CENTI	100UL
+#define MILLI	1000UL
+#define MICRO	1000000UL
+#define NANO	1000000000UL
+#define PICO	1000000000000ULL
+#define FEMTO	1000000000000000ULL
+
 #define MILLIWATT_PER_WATT	1000L
 #define MICROWATT_PER_MILLIWATT	1000L
 #define MICROWATT_PER_WATT	1000000L

include/uapi/linux/virtio_i2c.h

+/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
+/*
+ * Definitions for virtio I2C Adpter
+ *
+ * Copyright (c) 2021 Intel Corporation. All rights reserved.
+ */
+
+#ifndef _UAPI_LINUX_VIRTIO_I2C_H
+#define _UAPI_LINUX_VIRTIO_I2C_H
+
+#include <linux/const.h>
+#include <linux/types.h>
+
+/* The bit 0 of the @virtio_i2c_out_hdr.@flags, used to group the requests */
+#define VIRTIO_I2C_FLAGS_FAIL_NEXT	_BITUL(0)
+
+/**
+ * struct virtio_i2c_out_hdr - the virtio I2C message OUT header
+ * @addr: the controlled device address
+ * @padding: used to pad to full dword
+ * @flags: used for feature extensibility
+ */
+struct virtio_i2c_out_hdr {
+	__le16 addr;
+	__le16 padding;
+	__le32 flags;
+};
+
+/**
+ * struct virtio_i2c_in_hdr - the virtio I2C message IN header
+ * @status: the processing result from the backend
+ */
+struct virtio_i2c_in_hdr {
+	__u8 status;
+};
+
+/* The final status written by the device */
+#define VIRTIO_I2C_MSG_OK	0
+#define VIRTIO_I2C_MSG_ERR	1
+
+#endif /* _UAPI_LINUX_VIRTIO_I2C_H */

include/uapi/linux/virtio_ids.h

@@ -55,6 +55,7 @@
 #define VIRTIO_ID_FS			26 /* virtio filesystem */
 #define VIRTIO_ID_PMEM			27 /* virtio pmem */
 #define VIRTIO_ID_MAC80211_HWSIM	29 /* virtio mac80211-hwsim */
+#define VIRTIO_ID_I2C_ADAPTER		34 /* virtio i2c adapter */
 #define VIRTIO_ID_BT			40 /* virtio bluetooth */
 
 /*