LinuxLists.cc - [PATCH v10 2/2] input: joystick: driver for Adafruit Seesaw Gamepad

2023-11-21 12:36:35

Subject: [PATCH v10 2/2] input: joystick: driver for Adafruit Seesaw Gamepad

Adds a driver for a mini gamepad that communicates over i2c, the gamepad
has bidirectional thumb stick input and six buttons.

The gamepad chip utilizes the open framework from Adafruit called 'Seesaw'
to transmit the ADC data for the joystick and digital pin state for the
buttons. I have only implemented the functionality required to receive the
thumb stick and button state.

Steps in reading the gamepad state over i2c:
1. Reset the registers
2. Set the pin mode of the pins specified by the `BUTTON_MASK` to input
`BUTTON_MASK`: A bit-map for the six digital pins internally
connected to the joystick buttons.
3. Enable internal pullup resistors for the `BUTTON_MASK`
4. Bulk set the pin state HIGH for `BUTTON_MASK`
5. Poll the device for button and joystick state done by:
`seesaw_read_data(struct i2c_client *client, struct seesaw_data *data)`

Product page:
https://www.adafruit.com/product/5743
Arduino driver:
https://github.com/adafruit/Adafruit_Seesaw

Driver tested on RPi Zero 2W

Reviewed-by: Thomas Weißschuh <[email protected]>
Signed-off-by: Anshul Dalal <[email protected]>

---

Changes for v10:
- no updates

v9: https://lore.kernel.org/lkml/[email protected]/

Changes for v9:
- Added of_device_id

v8: https://lore.kernel.org/lkml/[email protected]/

Changes for v8:
- Updated invalid references to `adafruit_seesaw` to `adafruit-seesaw`

v7: https://lore.kernel.org/lkml/[email protected]/

Changes for v7:
adafruit-seesaw.c
- Fixed formatting for macro definitions
- Made SEESAW_BUTTON_MASK static const
- Removed __be16 type for x and y fields of seesaw_data
- Used sparse_keymap implementation instead of custom keymap
- Used i2c_msg instead of i2c_master_send and recv in
seesaw_register_read
- Use temporary variable `adc_data` to store data received from ADC
- Changed read_buf from u8[4] to __be32
- Use usleep_range instead of msleep
- Removed 'Reviewed-by: Thomas Weißschuh' due to large number of changes
since last review
Kconfig:
- Added `select INPUT_SPARSEKMAP`

v6: https://lore.kernel.org/lkml/[email protected]/

Changes for v6:
- Added TODO
- Removed `clang-format` directives
- Namespaced device buttons
- Removed `char physical_path[32]` field from `struct seesaw_gamepad`
- Added `packed` attribute to `struct seesaw_data`
- Moved from having booleans per button to single `u32 button_state`
- Added `seesaw_button_description` array to directly associate device
buttons with respective keycodes
- Added wrapper functions `seesaw_register_` around `i2c_master_` API
- Ratelimited input error reporting with `dev_err_ratelimited`
- Removed `of_device_id`

v5: https://lore.kernel.org/lkml/[email protected]/

Changes for v5:
- Added link to the datasheet
- Added debug log message when `seesaw_read_data` fails

v4: https://lore.kernel.org/lkml/[email protected]/

Changes for v4:
- Changed `1UL << BUTTON_` to BIT(BUTTON_)
- Removed `hardware_id` field from `struct seesaw_gamepad`
- Removed redundant checks for the number of bytes written and received by
`i2c_master_send` and `i2c_master_recv`
- Used `get_unaligned_be32` to instantiate `u32 result` from `read_buf`
- Changed `result & (1UL << BUTTON_)` to
`test_bit(BUTTON_, (long *)&result)`
- Changed `KBUILD_MODNAME` in id-tables to `SEESAW_DEVICE_NAME`
- Fixed formatting issues
- Changed button reporting:
Since the gamepad had the action buttons in a non-standard layout:
(X)
(Y) (A)
(B)
Therefore moved to using generic directional action button event codes
instead of BTN_[ABXY].

v3: https://lore.kernel.org/linux-input/[email protected]/

Changes for v3:
- no updates

v2: https://lore.kernel.org/linux-input/[email protected]/

Changes for v2:
adafruit-seesaw.c:
- Renamed file from 'adafruit_seesaw.c'
- Changed device name from 'seesaw_gamepad' to 'seesaw-gamepad'
- Changed count parameter for receiving joystick x on line 118:
`2` to `sizeof(write_buf)`
- Fixed invalid buffer size on line 123 and 126:
`data->y` to `sizeof(data->y)`
- Added comment for the `mdelay(10)` on line 169
- Changed inconsistent indentation on line 271
Kconfig:
- Fixed indentation for the help text
- Updated module name
Makefile:
- Updated module object file name
MAINTAINERS:
- Updated file name for the driver and bindings

v1: https://lore.kernel.org/linux-input/[email protected]/
---
MAINTAINERS | 7 +
drivers/input/joystick/Kconfig | 10 +
drivers/input/joystick/Makefile | 1 +
drivers/input/joystick/adafruit-seesaw.c | 318 +++++++++++++++++++++++
4 files changed, 336 insertions(+)
create mode 100644 drivers/input/joystick/adafruit-seesaw.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 81d5fc0bba68..b3f101edc24b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -441,6 +441,13 @@ W: http://wiki.analog.com/AD7879
W: https://ez.analog.com/linux-software-drivers
F: drivers/input/touchscreen/ad7879.c

+ADAFRUIT MINI I2C GAMEPAD
+M: Anshul Dalal <[email protected]>
+L: [email protected]
+S: Maintained
+F: Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml
+F: drivers/input/joystick/adafruit-seesaw.c
+
ADDRESS SPACE LAYOUT RANDOMIZATION (ASLR)
M: Jiri Kosina <[email protected]>
S: Maintained
diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index ac6925ce8366..7755e5b454d2 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -412,4 +412,14 @@ config JOYSTICK_SENSEHAT
To compile this driver as a module, choose M here: the
module will be called sensehat_joystick.

+config JOYSTICK_SEESAW
+ tristate "Adafruit Mini I2C Gamepad with Seesaw"
+ depends on I2C
+ select INPUT_SPARSEKMAP
+ help
+ Say Y here if you want to use the Adafruit Mini I2C Gamepad.
+
+ To compile this driver as a module, choose M here: the module will be
+ called adafruit-seesaw.
+
endif
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index 3937535f0098..9976f596a920 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_JOYSTICK_N64) += n64joy.o
obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o
obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o
obj-$(CONFIG_JOYSTICK_QWIIC) += qwiic-joystick.o
+obj-$(CONFIG_JOYSTICK_SEESAW) += adafruit-seesaw.o
obj-$(CONFIG_JOYSTICK_SENSEHAT) += sensehat-joystick.o
obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o
obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o
diff --git a/drivers/input/joystick/adafruit-seesaw.c b/drivers/input/joystick/adafruit-seesaw.c
new file mode 100644
index 000000000000..856ca223df58
--- /dev/null
+++ b/drivers/input/joystick/adafruit-seesaw.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 Anshul Dalal <[email protected]>
+ *
+ * Driver for Adafruit Mini I2C Gamepad
+ *
+ * Based on the work of:
+ * Oleh Kravchenko (Sparkfun Qwiic Joystick driver)
+ *
+ * Datasheet: https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf
+ * Product page: https://www.adafruit.com/product/5743
+ * Firmware and hardware sources: https://github.com/adafruit/Adafruit_Seesaw
+ *
+ * TODO:
+ * - Add interrupt support
+ */
+
+#include <asm/unaligned.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define SEESAW_DEVICE_NAME "seesaw-gamepad"
+
+#define SEESAW_STATUS_BASE 0x00
+#define SEESAW_GPIO_BASE 0x01
+#define SEESAW_ADC_BASE 0x09
+
+#define SEESAW_GPIO_DIRCLR_BULK 0x03
+#define SEESAW_GPIO_BULK 0x04
+#define SEESAW_GPIO_BULK_SET 0x05
+#define SEESAW_GPIO_PULLENSET 0x0b
+
+#define SEESAW_STATUS_HW_ID 0x01
+#define SEESAW_STATUS_SWRST 0x7f
+
+#define SEESAW_ADC_OFFSET 0x07
+
+#define SEESAW_BUTTON_A 0x05
+#define SEESAW_BUTTON_B 0x01
+#define SEESAW_BUTTON_X 0x06
+#define SEESAW_BUTTON_Y 0x02
+#define SEESAW_BUTTON_START 0x10
+#define SEESAW_BUTTON_SELECT 0x00
+
+#define SEESAW_ANALOG_X 0x0e
+#define SEESAW_ANALOG_Y 0x0f
+
+#define SEESAW_JOYSTICK_MAX_AXIS 1023
+#define SEESAW_JOYSTICK_FUZZ 2
+#define SEESAW_JOYSTICK_FLAT 4
+
+#define SEESAW_GAMEPAD_POLL_INTERVAL 16
+#define SEESAW_GAMEPAD_POLL_MIN 8
+#define SEESAW_GAMEPAD_POLL_MAX 32
+
+#define MSEC_PER_USEC 1000
+
+static const u32 SEESAW_BUTTON_MASK =
+ BIT(SEESAW_BUTTON_A) | BIT(SEESAW_BUTTON_B) | BIT(SEESAW_BUTTON_X) |
+ BIT(SEESAW_BUTTON_Y) | BIT(SEESAW_BUTTON_START) |
+ BIT(SEESAW_BUTTON_SELECT);
+
+struct seesaw_gamepad {
+ struct input_dev *input_dev;
+ struct i2c_client *i2c_client;
+};
+
+struct seesaw_data {
+ u16 x;
+ u16 y;
+ u32 button_state;
+};
+
+static const struct key_entry seesaw_buttons_new[] = {
+ { KE_KEY, SEESAW_BUTTON_A, .keycode = BTN_SOUTH },
+ { KE_KEY, SEESAW_BUTTON_B, .keycode = BTN_EAST },
+ { KE_KEY, SEESAW_BUTTON_X, .keycode = BTN_NORTH },
+ { KE_KEY, SEESAW_BUTTON_Y, .keycode = BTN_WEST },
+ { KE_KEY, SEESAW_BUTTON_START, .keycode = BTN_START },
+ { KE_KEY, SEESAW_BUTTON_SELECT, .keycode = BTN_SELECT },
+ { KE_END, 0 }
+};
+
+static int seesaw_register_read(struct i2c_client *client, u8 register_high,
+ u8 register_low, char *buf, int count)
+{
+ int ret;
+ u8 register_buf[2] = { register_high, register_low };
+
+ struct i2c_msg message_buf[2] = {
+ {
+ .addr = client->addr,
+ .flags = client->flags,
+ .len = sizeof(register_buf),
+ .buf = register_buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = client->flags | I2C_M_RD,
+ .len = count,
+ .buf = buf,
+ },
+ };
+ ret = i2c_transfer(client->adapter, message_buf,
+ ARRAY_SIZE(message_buf));
+
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int seesaw_register_write_u8(struct i2c_client *client, u8 register_high,
+ u8 register_low, u8 value)
+{
+ int ret;
+ u8 write_buf[3] = { register_high, register_low, value };
+
+ ret = i2c_master_send(client, write_buf, sizeof(write_buf));
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int seesaw_register_write_u32(struct i2c_client *client,
+ u8 register_high, u8 register_low,
+ u32 value)
+{
+ int ret;
+ u8 write_buf[6] = { register_high, register_low };
+
+ put_unaligned_be32(value, write_buf + 2);
+ ret = i2c_master_send(client, write_buf, sizeof(write_buf));
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int seesaw_read_data(struct i2c_client *client, struct seesaw_data *data)
+{
+ int ret;
+ __be16 adc_data;
+ __be32 read_buf;
+
+ ret = seesaw_register_read(client, SEESAW_GPIO_BASE, SEESAW_GPIO_BULK,
+ (char *)&read_buf, sizeof(read_buf));
+ if (ret)
+ return ret;
+
+ data->button_state = ~be32_to_cpu(read_buf);
+
+ ret = seesaw_register_read(client, SEESAW_ADC_BASE,
+ SEESAW_ADC_OFFSET + SEESAW_ANALOG_X,
+ (char *)&adc_data, sizeof(adc_data));
+ if (ret)
+ return ret;
+ /*
+ * ADC reads left as max and right as 0, must be reversed since kernel
+ * expects reports in opposite order.
+ */
+ data->x = SEESAW_JOYSTICK_MAX_AXIS - be16_to_cpu(adc_data);
+
+ ret = seesaw_register_read(client, SEESAW_ADC_BASE,
+ SEESAW_ADC_OFFSET + SEESAW_ANALOG_Y,
+ (char *)&adc_data, sizeof(adc_data));
+ if (ret)
+ return ret;
+ data->y = be16_to_cpu(adc_data);
+
+ return 0;
+}
+
+static void seesaw_poll(struct input_dev *input)
+{
+ int err, i;
+ struct seesaw_gamepad *private = input_get_drvdata(input);
+ struct seesaw_data data;
+
+ err = seesaw_read_data(private->i2c_client, &data);
+ if (err) {
+ dev_err_ratelimited(&input->dev,
+ "failed to read joystick state: %d\n", err);
+ return;
+ }
+
+ input_report_abs(input, ABS_X, data.x);
+ input_report_abs(input, ABS_Y, data.y);
+
+ for_each_set_bit(i, (long *)&SEESAW_BUTTON_MASK,
+ BITS_PER_TYPE(SEESAW_BUTTON_MASK)) {
+ if (!sparse_keymap_report_event(
+ input, i, data.button_state & BIT(i), false)) {
+ dev_err_ratelimited(&input->dev,
+ "failed to report keymap event");
+ };
+ }
+
+ input_sync(input);
+}
+
+static int seesaw_probe(struct i2c_client *client)
+{
+ int ret;
+ u8 hardware_id;
+ struct seesaw_gamepad *seesaw;
+
+ ret = seesaw_register_write_u8(client, SEESAW_STATUS_BASE,
+ SEESAW_STATUS_SWRST, 0xFF);
+ if (ret)
+ return ret;
+
+ /* Wait for the registers to reset before proceeding */
+ usleep_range(10 * MSEC_PER_USEC, 15 * MSEC_PER_USEC);
+
+ seesaw = devm_kzalloc(&client->dev, sizeof(*seesaw), GFP_KERNEL);
+ if (!seesaw)
+ return -ENOMEM;
+
+ ret = seesaw_register_read(client, SEESAW_STATUS_BASE,
+ SEESAW_STATUS_HW_ID, &hardware_id,
+ sizeof(hardware_id));
+ if (ret)
+ return ret;
+
+ dev_dbg(&client->dev, "Adafruit Seesaw Gamepad, Hardware ID: %02x\n",
+ hardware_id);
+
+ /* Set Pin Mode to input and enable pull-up resistors */
+ ret = seesaw_register_write_u32(client, SEESAW_GPIO_BASE,
+ SEESAW_GPIO_DIRCLR_BULK,
+ SEESAW_BUTTON_MASK);
+ if (ret)
+ return ret;
+ ret = seesaw_register_write_u32(client, SEESAW_GPIO_BASE,
+ SEESAW_GPIO_PULLENSET,
+ SEESAW_BUTTON_MASK);
+ if (ret)
+ return ret;
+ ret = seesaw_register_write_u32(client, SEESAW_GPIO_BASE,
+ SEESAW_GPIO_BULK_SET,
+ SEESAW_BUTTON_MASK);
+ if (ret)
+ return ret;
+
+ seesaw->i2c_client = client;
+ seesaw->input_dev = devm_input_allocate_device(&client->dev);
+ if (!seesaw->input_dev)
+ return -ENOMEM;
+
+ seesaw->input_dev->id.bustype = BUS_I2C;
+ seesaw->input_dev->name = "Adafruit Seesaw Gamepad";
+ seesaw->input_dev->phys = "i2c/" SEESAW_DEVICE_NAME;
+ input_set_drvdata(seesaw->input_dev, seesaw);
+ input_set_abs_params(seesaw->input_dev, ABS_X, 0,
+ SEESAW_JOYSTICK_MAX_AXIS, SEESAW_JOYSTICK_FUZZ,
+ SEESAW_JOYSTICK_FLAT);
+ input_set_abs_params(seesaw->input_dev, ABS_Y, 0,
+ SEESAW_JOYSTICK_MAX_AXIS, SEESAW_JOYSTICK_FUZZ,
+ SEESAW_JOYSTICK_FLAT);
+
+ ret = sparse_keymap_setup(seesaw->input_dev, seesaw_buttons_new, NULL);
+ if (ret) {
+ dev_err(&client->dev,
+ "failed to set up input device keymap: %d\n", ret);
+ return ret;
+ }
+
+ ret = input_setup_polling(seesaw->input_dev, seesaw_poll);
+ if (ret) {
+ dev_err(&client->dev, "failed to set up polling: %d\n", ret);
+ return ret;
+ }
+
+ input_set_poll_interval(seesaw->input_dev, SEESAW_GAMEPAD_POLL_INTERVAL);
+ input_set_max_poll_interval(seesaw->input_dev, SEESAW_GAMEPAD_POLL_MAX);
+ input_set_min_poll_interval(seesaw->input_dev, SEESAW_GAMEPAD_POLL_MIN);
+
+ ret = input_register_device(seesaw->input_dev);
+ if (ret) {
+ dev_err(&client->dev, "failed to register joystick: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id seesaw_id_table[] = {
+ { SEESAW_DEVICE_NAME, 0 },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, seesaw_id_table);
+
+static const struct of_device_id seesaw_of_table[] = {
+ { .compatible = "adafruit,seesaw-gamepad"},
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, seesaw_of_table);
+
+static struct i2c_driver seesaw_driver = {
+ .driver = {
+ .name = SEESAW_DEVICE_NAME,
+ .of_match_table = of_match_ptr(seesaw_of_table),
+ },
+ .id_table = seesaw_id_table,
+ .probe = seesaw_probe,
+};
+module_i2c_driver(seesaw_driver);
+
+MODULE_AUTHOR("Anshul Dalal <[email protected]>");
+MODULE_DESCRIPTION("Adafruit Mini I2C Gamepad driver");
+MODULE_LICENSE("GPL");
--
2.42.1

2023-11-21 22:52:57

by kernel test robot

[permalink] [raw]

Subject: Re: [PATCH v10 2/2] input: joystick: driver for Adafruit Seesaw Gamepad

2023-11-24 13:20:18

by kernel test robot

[permalink] [raw]

Subject: Re: [PATCH v10 2/2] input: joystick: driver for Adafruit Seesaw Gamepad

Hi Anshul,

kernel test robot noticed the following build warnings:

[auto build test WARNING on dtor-input/next]
[also build test WARNING on dtor-input/for-linus hid/for-next linus/master v6.7-rc2 next-20231124]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Anshul-Dalal/input-joystick-driver-for-Adafruit-Seesaw-Gamepad/20231121-204243
base: https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
patch link: https://lore.kernel.org/r/20231121123409.2231115-2-anshulusr%40gmail.com
patch subject: [PATCH v10 2/2] input: joystick: driver for Adafruit Seesaw Gamepad
config: hexagon-randconfig-r123-20231123 (https://download.01.org/0day-ci/archive/20231124/[email protected]/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20231124/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

In file included from drivers/input/joystick/adafruit-seesaw.c:21:
In file included from include/linux/i2c.h:19:
In file included from include/linux/regulator/consumer.h:35:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/input/joystick/adafruit-seesaw.c:21:
In file included from include/linux/i2c.h:19:
In file included from include/linux/regulator/consumer.h:35:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/input/joystick/adafruit-seesaw.c:21:
In file included from include/linux/i2c.h:19:
In file included from include/linux/regulator/consumer.h:35:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> drivers/input/joystick/adafruit-seesaw.c:300:34: warning: unused variable 'seesaw_of_table' [-Wunused-const-variable]
300 | static const struct of_device_id seesaw_of_table[] = {
| ^
7 warnings generated.

vim +/seesaw_of_table +300 drivers/input/joystick/adafruit-seesaw.c

299
> 300 static const struct of_device_id seesaw_of_table[] = {
301 { .compatible = "adafruit,seesaw-gamepad"},
302 { /* Sentinel */ }
303 };
304 MODULE_DEVICE_TABLE(of, seesaw_of_table);
305

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