drivers/input/touchscreen/cyttsp_i2c.c:47:18: error: implicit declaration of function 'i2c_transfer'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e32cde8d2bd7d251a8f9b434143977ddf13dcec6
commit: 25162a4f64f8ba0065f300977589fe1f6af332f0 Input: cyttsp4 - remove driver
date:   8 weeks ago
config: x86_64-randconfig-001-20231120 (https://download.01.org/0day-ci/archive/20241002/202410020735.aBI61ZYn-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241002/202410020735.aBI61ZYn-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410020735.aBI61ZYn-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   In file included from include/linux/sched.h:38,
                    from include/linux/percpu.h:13,
                    from arch/x86/include/asm/msr.h:15,
                    from arch/x86/include/asm/tsc.h:10,
                    from arch/x86/include/asm/timex.h:6,
                    from include/linux/timex.h:67,
                    from include/linux/time32.h:13,
                    from include/linux/time.h:60,
                    from include/linux/stat.h:19,
                    from include/linux/module.h:13,
                    from drivers/input/touchscreen/cyttsp_core.h:22,
                    from drivers/input/touchscreen/cyttsp_i2c.c:16:
   include/linux/mm_types_task.h:19:45: warning: "CONFIG_SPLIT_PTLOCK_CPUS" is not defined, evaluates to 0 [-Wundef]
      19 | #define USE_SPLIT_PTE_PTLOCKS   (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
         |                                             ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mm.h:2928:5: note: in expansion of macro 'USE_SPLIT_PTE_PTLOCKS'
    2928 | #if USE_SPLIT_PTE_PTLOCKS
         |     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/mm_types_task.h:19:45: warning: "CONFIG_SPLIT_PTLOCK_CPUS" is not defined, evaluates to 0 [-Wundef]
      19 | #define USE_SPLIT_PTE_PTLOCKS   (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
         |                                             ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mm_types_task.h:20:34: note: in expansion of macro 'USE_SPLIT_PTE_PTLOCKS'
      20 | #define USE_SPLIT_PMD_PTLOCKS   (USE_SPLIT_PTE_PTLOCKS && \
         |                                  ^~~~~~~~~~~~~~~~~~~~~
   include/linux/mm.h:3050:5: note: in expansion of macro 'USE_SPLIT_PMD_PTLOCKS'
    3050 | #if USE_SPLIT_PMD_PTLOCKS
         |     ^~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/cyttsp_i2c.c: In function 'cyttsp_i2c_read_block_data':
>> drivers/input/touchscreen/cyttsp_i2c.c:47:18: error: implicit declaration of function 'i2c_transfer' [-Werror=implicit-function-declaration]
      47 |         retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
         |                  ^~~~~~~~~~~~
   drivers/input/touchscreen/cyttsp_i2c.c: In function 'cyttsp_i2c_probe':
   drivers/input/touchscreen/cyttsp_i2c.c:90:14: error: implicit declaration of function 'i2c_check_functionality' [-Werror=implicit-function-declaration]
      90 |         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
         |              ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/cyttsp_i2c.c: At top level:
   drivers/input/touchscreen/cyttsp_i2c.c:128:1: warning: data definition has no type or storage class
     128 | module_i2c_driver(cyttsp_i2c_driver);
         | ^~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/cyttsp_i2c.c:128:1: error: type defaults to 'int' in declaration of 'module_i2c_driver' [-Werror=implicit-int]
   drivers/input/touchscreen/cyttsp_i2c.c:128:1: warning: parameter names (without types) in function declaration
   drivers/input/touchscreen/cyttsp_i2c.c:118:26: warning: 'cyttsp_i2c_driver' defined but not used [-Wunused-variable]
     118 | static struct i2c_driver cyttsp_i2c_driver = {
         |                          ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/i2c_transfer +47 drivers/input/touchscreen/cyttsp_i2c.c

    24	
    25	static int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
    26					      u16 addr, u8 length, void *values)
    27	{
    28		struct i2c_client *client = to_i2c_client(dev);
    29		u8 client_addr = client->addr | ((addr >> 8) & 0x1);
    30		u8 addr_lo = addr & 0xFF;
    31		struct i2c_msg msgs[] = {
    32			{
    33				.addr = client_addr,
    34				.flags = 0,
    35				.len = 1,
    36				.buf = &addr_lo,
    37			},
    38			{
    39				.addr = client_addr,
    40				.flags = I2C_M_RD,
    41				.len = length,
    42				.buf = values,
    43			},
    44		};
    45		int retval;
    46	
  > 47		retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
    48		if (retval < 0)
    49			return retval;
    50	
    51		return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
    52	}
    53	

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