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linux-sg2042
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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 

Pull more i2c updates from Wolfram Sang:
 "Mostly bugfixes, small but wanted cleanups, and Paul's init.h removal
  applied"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: rcar: fix NACK error code
  i2c: update i2c_algorithm documentation
  i2c: rcar: use devm_clk_get to ensure clock is properly ref-counted
  i2c: rcar: do not print error if device nacks transfer
  i2c: rely on driver core when sanitizing devices
  i2c: delete non-required instances of include <linux/init.h>
  i2c: acorn: is tristate and should use module.h
  i2c: piix4: Standardize log messages
  i2c: piix4: Use different message for AMD Auxiliary SMBus Controller
  i2c: piix4: Add support for AMD ML and CZ SMBus changes
This commit is contained in:
Linus Torvalds 2014-01-29 19:56:20 -08:00
parent 9076e0cae7 6ff4b10516
commit f7a6ad9fa2
48 changed files with 64 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/i2c/busses/i2c-piix4
View File

@ -13,7 +13,7 @@ Supported adapters:
* AMD SP5100 (SB700 derivative found on some server mainboards)
Datasheet: Publicly available at the AMD website
http://support.amd.com/us/Embedded_TechDocs/44413.pdf
* AMD Hudson-2, CZ
* AMD Hudson-2, ML, CZ
Datasheet: Not publicly available
* Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge
Datasheet: Publicly available at the SMSC website http://www.smsc.com

1
drivers/i2c/algos/i2c-algo-bit.c
View File

@ -25,7 +25,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/i2c.h>

1
drivers/i2c/algos/i2c-algo-pca.c
View File

@ -24,7 +24,6 @@
#include <linux/moduleparam.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pca.h>

1
drivers/i2c/algos/i2c-algo-pcf.c
View File

@ -30,7 +30,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pcf.h>

1
drivers/i2c/busses/Kconfig
View File

@ -152,6 +152,7 @@ config I2C_PIIX4
ATI SB700/SP5100
ATI SB800
AMD Hudson-2
AMD ML
AMD CZ
Serverworks OSB4
Serverworks CSB5

2
drivers/i2c/busses/i2c-acorn.c
View File

@ -12,7 +12,7 @@
* On Acorn machines, the following i2c devices are on the bus:
* - PCF8583 real time clock & static RAM
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-ali1535.c
View File

@ -58,7 +58,6 @@
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-ali1563.c
View File

@ -20,7 +20,6 @@
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
#define ALI1563_MAX_TIMEOUT 500

1
drivers/i2c/busses/i2c-ali15x3.c
View File

@ -65,7 +65,6 @@
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-amd756.c
View File

@ -41,7 +41,6 @@
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-amd8111.c
View File

@ -13,7 +13,6 @@
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/acpi.h>

1
drivers/i2c/busses/i2c-au1550.c
View File

@ -31,7 +31,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/slab.h>

1
drivers/i2c/busses/i2c-cbus-gpio.c
View File

@ -19,7 +19,6 @@
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/errno.h>

1
drivers/i2c/busses/i2c-cpm.c
View File

@ -33,7 +33,6 @@
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/stddef.h>

1
drivers/i2c/busses/i2c-eg20t.c
View File

@ -18,7 +18,6 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/fs.h>

1
drivers/i2c/busses/i2c-exynos5.c
View File

@ -12,7 +12,6 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/interrupt.h>
#include <linux/delay.h>

1
drivers/i2c/busses/i2c-highlander.c
View File

@ -12,7 +12,6 @@
* of this archive for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>

1
drivers/i2c/busses/i2c-hydra.c
View File

@ -27,7 +27,6 @@
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/hydra.h>

1
drivers/i2c/busses/i2c-ibm_iic.c
View File

@ -36,7 +36,6 @@
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-iop3xx.c
View File

@ -34,7 +34,6 @@
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

1
drivers/i2c/busses/i2c-isch.c
View File

@ -33,7 +33,6 @@
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/acpi.h>

1
drivers/i2c/busses/i2c-ismt.c
View File

@ -62,7 +62,6 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>

1
drivers/i2c/busses/i2c-mpc.c
View File

@ -16,7 +16,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>

1
drivers/i2c/busses/i2c-nforce2.c
View File

@ -51,7 +51,6 @@
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/dmi.h>

1
drivers/i2c/busses/i2c-ocores.c
View File

@ -15,7 +15,6 @@
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

1
drivers/i2c/busses/i2c-octeon.c
View File

@ -18,7 +18,6 @@
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/of.h>

1
drivers/i2c/busses/i2c-pca-platform.c
View File

@ -12,7 +12,6 @@
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/jiffies.h>

44
drivers/i2c/busses/i2c-piix4.c
View File

@ -22,7 +22,7 @@
Intel PIIX4, 440MX
Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
AMD Hudson-2, CZ
AMD Hudson-2, ML, CZ
SMSC Victory66
Note: we assume there can only be one device, with one or more
@ -38,7 +38,6 @@
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>
@ -208,16 +207,16 @@ static int piix4_setup(struct pci_dev *PIIX4_dev,
"WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
} else {
dev_err(&PIIX4_dev->dev,
"Host SMBus controller not enabled!\n");
"SMBus Host Controller not enabled!\n");
release_region(piix4_smba, SMBIOSIZE);
return -ENODEV;
}
}
if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
else if ((temp & 0x0E) == 0)
dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
else
dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
"(or code out of date)!\n");
@ -235,7 +234,8 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
{
unsigned short piix4_smba;
unsigned short smba_idx = 0xcd6;
u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en;
u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status;
u8 i2ccfg, i2ccfg_offset = 0x10;
/* SB800 and later SMBus does not support forcing address */
if (force || force_addr) {
@ -245,7 +245,15 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
}
/* Determine the address of the SMBus areas */
smb_en = (aux) ? 0x28 : 0x2c;
if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
PIIX4_dev->revision >= 0x41) ||
(PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
PIIX4_dev->device == 0x790b &&
PIIX4_dev->revision >= 0x49))
smb_en = 0x00;
else
smb_en = (aux) ? 0x28 : 0x2c;
if (!request_region(smba_idx, 2, "smba_idx")) {
dev_err(&PIIX4_dev->dev, "SMBus base address index region "
@ -258,13 +266,22 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
smba_en_hi = inb_p(smba_idx + 1);
release_region(smba_idx, 2);
if ((smba_en_lo & 1) == 0) {
if (!smb_en) {
smb_en_status = smba_en_lo & 0x10;
piix4_smba = smba_en_hi << 8;
if (aux)
piix4_smba |= 0x20;
} else {
smb_en_status = smba_en_lo & 0x01;
piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
}
if (!smb_en_status) {
dev_err(&PIIX4_dev->dev,
"Host SMBus controller not enabled!\n");
"SMBus Host Controller not enabled!\n");
return -ENODEV;
}
piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
return -ENODEV;
@ -277,7 +294,8 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
/* Aux SMBus does not support IRQ information */
if (aux) {
dev_info(&PIIX4_dev->dev,
"SMBus Host Controller at 0x%x\n", piix4_smba);
"Auxiliary SMBus Host Controller at 0x%x\n",
piix4_smba);
return piix4_smba;
}
@ -292,9 +310,9 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
release_region(piix4_smba + i2ccfg_offset, 1);
if (i2ccfg & 1)
dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus.\n");
dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
else
dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus.\n");
dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
dev_info(&PIIX4_dev->dev,
"SMBus Host Controller at 0x%x, revision %d\n",

1
drivers/i2c/busses/i2c-pmcmsp.c
View File

@ -26,7 +26,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>

1
drivers/i2c/busses/i2c-powermac.c
View File

@ -24,7 +24,6 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/of_irq.h>

1
drivers/i2c/busses/i2c-puv3.c
View File

@ -17,7 +17,6 @@
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/io.h>

22
drivers/i2c/busses/i2c-rcar.c
View File

@ -26,7 +26,6 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/i2c.h>
@ -111,6 +110,7 @@ struct rcar_i2c_priv {
void __iomem *io;
struct i2c_adapter adap;
struct i2c_msg *msg;
struct clk *clk;
spinlock_t lock;
wait_queue_head_t wait;
@ -227,18 +227,12 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,
u32 bus_speed,
struct device *dev)
{
struct clk *clkp = clk_get(dev, NULL);
u32 scgd, cdf;
u32 round, ick;
u32 scl;
u32 cdf_width;
unsigned long rate;
if (IS_ERR(clkp)) {
dev_err(dev, "couldn't get clock\n");
return PTR_ERR(clkp);
}
switch (priv->devtype) {
case I2C_RCAR_GEN1:
cdf_width = 2;
@ -266,7 +260,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,
* clkp : peripheral_clk
* F[] : integer up-valuation
*/
rate = clk_get_rate(clkp);
rate = clk_get_rate(priv->clk);
cdf = rate / 20000000;
if (cdf >= 1 << cdf_width) {
dev_err(dev, "Input clock %lu too high\n", rate);
@ -308,7 +302,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,
scgd_find:
dev_dbg(dev, "clk %d/%d(%lu), round %u, CDF:0x%x, SCGD: 0x%x\n",
scl, bus_speed, clk_get_rate(clkp), round, cdf, scgd);
scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd);
/*
* keep icccr value
@ -604,7 +598,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
* error handling
*/
if (rcar_i2c_flags_has(priv, ID_NACK)) {
ret = -EREMOTEIO;
ret = -ENXIO;
break;
}
@ -623,7 +617,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
pm_runtime_put(dev);
if (ret < 0)
if (ret < 0 && ret != -ENXIO)
dev_err(dev, "error %d : %x\n", ret, priv->flags);
return ret;
@ -664,6 +658,12 @@ static int rcar_i2c_probe(struct platform_device *pdev)
return -ENOMEM;
}
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "cannot get clock\n");
return PTR_ERR(priv->clk);
}
bus_speed = 100000; /* default 100 kHz */
ret = of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed);
if (ret < 0 && pdata && pdata->bus_speed)

1
drivers/i2c/busses/i2c-scmi.c
View File

@ -12,7 +12,6 @@
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/acpi.h>

1
drivers/i2c/busses/i2c-sh7760.c
View File

@ -11,7 +11,6 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>

1
drivers/i2c/busses/i2c-simtec.c
View File

@ -20,7 +20,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

1
drivers/i2c/busses/i2c-sis630.c
View File

@ -45,7 +45,6 @@
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-sis96x.c
View File

@ -36,7 +36,6 @@
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-via.c
View File

@ -22,7 +22,6 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>

1
drivers/i2c/busses/i2c-xiic.c
View File

@ -30,7 +30,6 @@
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/delay.h>

1
drivers/i2c/busses/i2c-xlr.c
View File

@ -11,7 +11,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/errno.h>

1
drivers/i2c/busses/scx200_i2c.c
View File

@ -26,7 +26,6 @@
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>

13
drivers/i2c/i2c-core.c
View File

@ -261,10 +261,9 @@ static int i2c_device_probe(struct device *dev)
acpi_dev_pm_attach(&client->dev, true);
status = driver->probe(client, i2c_match_id(driver->id_table, client));
if (status) {
i2c_set_clientdata(client, NULL);
if (status)
acpi_dev_pm_detach(&client->dev, true);
}
return status;
}
@ -272,7 +271,7 @@ static int i2c_device_remove(struct device *dev)
{
struct i2c_client *client = i2c_verify_client(dev);
struct i2c_driver *driver;
int status;
int status = 0;
if (!client || !dev->driver)
return 0;
@ -281,12 +280,8 @@ static int i2c_device_remove(struct device *dev)
if (driver->remove) {
dev_dbg(dev, "remove\n");
status = driver->remove(client);
} else {
dev->driver = NULL;
status = 0;
}
if (status == 0)
i2c_set_clientdata(client, NULL);
acpi_dev_pm_detach(&client->dev, true);
return status;
}

1
drivers/i2c/muxes/i2c-arb-gpio-challenge.c
View File

@ -19,7 +19,6 @@
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>

1
drivers/i2c/muxes/i2c-mux-gpio.c
View File

@ -12,7 +12,6 @@
#include <linux/i2c-mux.h>
#include <linux/i2c-mux-gpio.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gpio.h>

1
drivers/i2c/muxes/i2c-mux-pca9541.c
View File

@ -17,7 +17,6 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/slab.h>

1
drivers/i2c/muxes/i2c-mux-pca954x.c
View File

@ -40,7 +40,6 @@
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/i2c/pca954x.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>

1
drivers/i2c/muxes/i2c-mux-pinctrl.c
View File

@ -18,7 +18,6 @@
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/i2c-mux-pinctrl.h>

16
include/linux/i2c.h
View File

@ -342,11 +342,25 @@ i2c_register_board_info(int busnum, struct i2c_board_info const *info,
}
#endif /* I2C_BOARDINFO */
/*
/**
* struct i2c_algorithm - represent I2C transfer method
* @master_xfer: Issue a set of i2c transactions to the given I2C adapter
* defined by the msgs array, with num messages available to transfer via
* the adapter specified by adap.
* @smbus_xfer: Issue smbus transactions to the given I2C adapter. If this
* is not present, then the bus layer will try and convert the SMBus calls
* into I2C transfers instead.
* @functionality: Return the flags that this algorithm/adapter pair supports
* from the I2C_FUNC_* flags.
*
* The following structs are for those who like to implement new bus drivers:
* i2c_algorithm is the interface to a class of hardware solutions which can
* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
* to name two of the most common.
*
* The return codes from the @master_xfer field should indicate the type of
* error code that occured during the transfer, as documented in the kernel
* Documentation file Documentation/i2c/fault-codes.
*/
struct i2c_algorithm {
/* If an adapter algorithm can't do I2C-level access, set master_xfer