linux-kernel - Re: [PATCH v3] Input: add bu21029 touch driver

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Date:   Mon, 18 Jun 2018 03:19:26 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Mark Jonas <mark.jonas@...bosch.com>
Cc:     kbuild-all@...org, Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, hs@...x.de,
        Zhu Yi <yi.zhu5@...bosch.com>,
        Mark Jonas <mark.jonas@...bosch.com>
Subject: Re: [PATCH v3] Input: add bu21029 touch driver

Hi Zhu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v4.17-rc4]
[also build test WARNING on next-20180615]
[cannot apply to input/next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Mark-Jonas/Input-add-bu21029-touch-driver/20180512-091305
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/input/touchscreen/bu21029_ts.c:293:13: sparse: restricted __be16 degrades to integer

vim +293 drivers/input/touchscreen/bu21029_ts.c

   262	
   263	static int bu21029_start_chip(struct input_dev *dev)
   264	{
   265		struct bu21029_ts_data *bu21029 = input_get_drvdata(dev);
   266		struct i2c_client *i2c = bu21029->client;
   267		struct {
   268			u8 reg;
   269			u8 value;
   270		} init_table[] = {
   271			{BU21029_CFR0_REG, CFR0_VALUE},
   272			{BU21029_CFR1_REG, CFR1_VALUE},
   273			{BU21029_CFR2_REG, CFR2_VALUE},
   274			{BU21029_CFR3_REG, CFR3_VALUE},
   275			{BU21029_LDO_REG,  LDO_VALUE}
   276		};
   277		int error, i;
   278		u16 hwid;
   279	
   280		/* take chip out of reset */
   281		gpiod_set_value_cansleep(bu21029->reset_gpios, 0);
   282		mdelay(START_DELAY_MS);
   283	
   284		error = i2c_smbus_read_i2c_block_data(i2c,
   285						      BU21029_HWID_REG,
   286						      2,
   287						      (u8 *)&hwid);
   288		if (error < 0) {
   289			dev_err(&i2c->dev, "failed to read HW ID\n");
   290			goto out;
   291		}
   292	
 > 293		if (cpu_to_be16(hwid) != SUPPORTED_HWID) {
   294			dev_err(&i2c->dev, "unsupported HW ID 0x%x\n", hwid);
   295			error = -ENODEV;
   296			goto out;
   297		}
   298	
   299		for (i = 0; i < ARRAY_SIZE(init_table); ++i) {
   300			error = i2c_smbus_write_byte_data(i2c,
   301							  init_table[i].reg,
   302							  init_table[i].value);
   303			if (error < 0) {
   304				dev_err(&i2c->dev,
   305					"failed to write 0x%x to register 0x%x\n",
   306					init_table[i].value,
   307					init_table[i].reg);
   308				goto out;
   309			}
   310		}
   311	
   312		error = i2c_smbus_write_byte(i2c, BU21029_AUTOSCAN);
   313		if (error < 0) {
   314			dev_err(&i2c->dev, "failed to start autoscan\n");
   315			goto out;
   316		}
   317	
   318		enable_irq(bu21029->client->irq);
   319		return 0;
   320	
   321	out:
   322		bu21029_stop_chip(dev);
   323		return error;
   324	}
   325	

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