From patchwork Fri Oct 27 05:18:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshul Dalal X-Patchwork-Id: 739015 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7EFD9C25B47 for ; Fri, 27 Oct 2023 05:19:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229604AbjJ0FTv (ORCPT ); Fri, 27 Oct 2023 01:19:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229590AbjJ0FTu (ORCPT ); Fri, 27 Oct 2023 01:19:50 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4B5A1A7; Thu, 26 Oct 2023 22:19:47 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id 41be03b00d2f7-5aa481d53e5so1348398a12.1; Thu, 26 Oct 2023 22:19:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698383987; x=1698988787; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=fA+Tv1bE2U9KWCqAA1m16+V2i4hhY6QGRQgT7CJSbXI=; b=XRJPZBLNZQTXvoBFoI7FQqfcPzVf1aChI1eqqG+QssCA5c5js263PAD17TMQOBrYSV fya9//DegWgifaboghh1qqJZYSuPkYxCXN7CFfhSsXMgeQHwJ5VIGxHE5KkE3UiA2CRu PRBQnanJr+ygWFucaSpY06y8CoNk6kPr6iIR/FP8P4H++JjaMXFpOPo23X0dLfWg9lrw k/w/uS++vCDeMnE1g+3F/MySNQSJmnQIz5Qhn+m8LqDz+mZ0YUP+yiH6FGVeQvR30b1Y om+aSsNJAgt+Ap7TsKAeRbvHwu4J+J5S5guiYPvNBurRfKxnHFXqGjb2U30QRTc7pAhA JdDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698383987; x=1698988787; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=fA+Tv1bE2U9KWCqAA1m16+V2i4hhY6QGRQgT7CJSbXI=; b=S9tWOR70/Mas4aBvxRfAzQhk2oXWIRP8HfzYNjHuq5lTgCQz/TV3yVxF/zJpEqOMFL mlocXPU2vEUJ5qN2sPSU+WVgiEoKoG4fby4UHpI2ZzBvVCPCw2r7zxYvhhCDVRDlb09L EgFXB665MLESBz2cPIJdfKUVbCP4zPkZ/rGuo5V3796k+9i+k7QyP5iZuBw0hlv93+7H vJKcsA9T4LVd5aEI0P+gUa+8+fYMsLtkYGW5aOKaPQ7118SgW1tBZYSBTkJPF+HyVZYL aEYpEBJu41IucF+GdPKmEBVVoqY3ikFnzC8ggW+aL5WMl2P42z5C351AbTY+q2QSOLZn LdTg== X-Gm-Message-State: AOJu0Ywvwy0cEcunJbYcV7jrxbqNhlJog9EVH3wuQ233oGEAYxPzIj70 H5VvY//GOOT+IoTcIe6GtagcLdgyFxoNxyNI X-Google-Smtp-Source: AGHT+IFvz/xV6lMfHz3vDz/j1mVa+ah0INFY3WvFerJgzjK4K0wG5CL9dE6a9/0sZ3STEpSy22cvrA== X-Received: by 2002:a17:90a:c215:b0:27d:491d:2e40 with SMTP id e21-20020a17090ac21500b0027d491d2e40mr1456057pjt.22.1698383987087; Thu, 26 Oct 2023 22:19:47 -0700 (PDT) Received: from localhost.localdomain ([2401:4900:6286:35cd:e1b0:b6b4:69e:b5fb]) by smtp.gmail.com with ESMTPSA id h16-20020a17090adb9000b00276e8e4f1fbsm2494296pjv.1.2023.10.26.22.19.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Oct 2023 22:19:46 -0700 (PDT) From: Anshul Dalal To: linux-input@vger.kernel.org, devicetree@vger.kernel.org Cc: Anshul Dalal , Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , Jeff LaBundy , Shuah Khan , linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org, Conor Dooley , Krzysztof Kozlowski Subject: [PATCH v6 1/2] dt-bindings: input: bindings for Adafruit Seesaw Gamepad Date: Fri, 27 Oct 2023 10:48:10 +0530 Message-ID: <20231027051819.81333-1-anshulusr@gmail.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Adds bindings for the Adafruit Seesaw Gamepad. The gamepad functions as an i2c device with the default address of 0x50 and has an IRQ pin that can be enabled in the driver to allow for a rising edge trigger on each button press or joystick movement. Product page: https://www.adafruit.com/product/5743 Arduino driver: https://github.com/adafruit/Adafruit_Seesaw Reviewed-by: Conor Dooley Reviewed-by: Krzysztof Kozlowski Signed-off-by: Anshul Dalal --- Changes for v6: - no updates Changes for v5: - Added link to the datasheet Changes for v4: - Fixed the URI for the id field - Added `interrupts` property Changes for v3: - Updated id field to reflect updated file name from previous version - Added `reg` property Changes for v2: - Renamed file to `adafruit,seesaw-gamepad.yaml` - Removed quotes for `$id` and `$schema` - Removed "Bindings for" from the description - Changed node name to the generic name "joystick" - Changed compatible to 'adafruit,seesaw-gamepad' instead of 'adafruit,seesaw_gamepad' .../input/adafruit,seesaw-gamepad.yaml | 60 +++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml diff --git a/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml b/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml new file mode 100644 index 000000000000..3f0d1c5a3b9b --- /dev/null +++ b/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml @@ -0,0 +1,60 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/adafruit,seesaw-gamepad.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Adafruit Mini I2C Gamepad with seesaw + +maintainers: + - Anshul Dalal + +description: | + Adafruit Mini I2C Gamepad + + +-----------------------------+ + | ___ | + | / \ (X) | + | | S | __ __ (Y) (A) | + | \___/ |ST| |SE| (B) | + | | + +-----------------------------+ + + S -> 10-bit percision bidirectional analog joystick + ST -> Start + SE -> Select + X, A, B, Y -> Digital action buttons + + Datasheet: https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf + Product page: https://www.adafruit.com/product/5743 + Arduino Driver: https://github.com/adafruit/Adafruit_Seesaw + +properties: + compatible: + const: adafruit,seesaw-gamepad + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + description: + The gamepad's IRQ pin triggers a rising edge if interrupts are enabled. + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + joystick@50 { + compatible = "adafruit,seesaw-gamepad"; + reg = <0x50>; + }; + }; From patchwork Fri Oct 27 05:18:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Anshul Dalal X-Patchwork-Id: 738818 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C5C1C25B47 for ; Fri, 27 Oct 2023 05:20:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232135AbjJ0FT7 (ORCPT ); Fri, 27 Oct 2023 01:19:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229590AbjJ0FT6 (ORCPT ); Fri, 27 Oct 2023 01:19:58 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F9B71A5; 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Thu, 26 Oct 2023 22:19:53 -0700 (PDT) From: Anshul Dalal To: linux-input@vger.kernel.org, devicetree@vger.kernel.org Cc: Anshul Dalal , Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , Jeff LaBundy , Shuah Khan , linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 2/2] input: joystick: driver for Adafruit Seesaw Gamepad Date: Fri, 27 Oct 2023 10:48:11 +0530 Message-ID: <20231027051819.81333-2-anshulusr@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231027051819.81333-1-anshulusr@gmail.com> References: <20231027051819.81333-1-anshulusr@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org 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 Signed-off-by: Anshul Dalal --- 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` Changes for v5: - Added link to the datasheet - Added debug log message when `seesaw_read_data` fails 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]. Changes for v3: - no updates 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 MAINTAINERS | 7 + drivers/input/joystick/Kconfig | 9 + drivers/input/joystick/Makefile | 1 + drivers/input/joystick/adafruit-seesaw.c | 310 +++++++++++++++++++++++ 4 files changed, 327 insertions(+) create mode 100644 drivers/input/joystick/adafruit-seesaw.c diff --git a/MAINTAINERS b/MAINTAINERS index 4cc6bf79fdd8..0595c832c248 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 +L: linux-input@vger.kernel.org +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 S: Maintained diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index ac6925ce8366..df9cd1830b29 100644 --- a/drivers/input/joystick/Kconfig +++ b/drivers/input/joystick/Kconfig @@ -412,4 +412,13 @@ 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 + 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..1aa6fbe4fda4 --- /dev/null +++ b/drivers/input/joystick/adafruit-seesaw.c @@ -0,0 +1,310 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2023 Anshul Dalal + * + * 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 +#include +#include +#include +#include +#include +#include + +#define SEESAW_DEVICE_NAME "seesaw-gamepad" + +#define SEESAW_STATUS_BASE 0 +#define SEESAW_GPIO_BASE 1 +#define SEESAW_ADC_BASE 9 + +#define SEESAW_GPIO_DIRCLR_BULK 3 +#define SEESAW_GPIO_BULK 4 +#define SEESAW_GPIO_BULK_SET 5 +#define SEESAW_GPIO_PULLENSET 11 + +#define SEESAW_STATUS_HW_ID 1 +#define SEESAW_STATUS_SWRST 127 + +#define SEESAW_ADC_OFFSET 7 + +#define SEESAW_BUTTON_A 5 +#define SEESAW_BUTTON_B 1 +#define SEESAW_BUTTON_X 6 +#define SEESAW_BUTTON_Y 2 +#define SEESAW_BUTTON_START 16 +#define SEESAW_BUTTON_SELECT 0 + +#define SEESAW_ANALOG_X 14 +#define SEESAW_ANALOG_Y 15 + +#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 + +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 { + __be16 x; + __be16 y; + u32 button_state; +} __packed; + +struct seesaw_button_description { + unsigned int code; + unsigned int bit; +}; + +static const struct seesaw_button_description seesaw_buttons[] = { + { + .code = BTN_EAST, + .bit = SEESAW_BUTTON_A, + }, + { + .code = BTN_SOUTH, + .bit = SEESAW_BUTTON_B, + }, + { + .code = BTN_NORTH, + .bit = SEESAW_BUTTON_X, + }, + { + .code = BTN_WEST, + .bit = SEESAW_BUTTON_Y, + }, + { + .code = BTN_START, + .bit = SEESAW_BUTTON_START, + }, + { + .code = BTN_SELECT, + .bit = SEESAW_BUTTON_SELECT, + }, +}; + +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 }; + + ret = i2c_master_send(client, register_buf, sizeof(register_buf)); + if (ret < 0) + return ret; + ret = i2c_master_recv(client, buf, count); + 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; + u8 read_buf[4]; + + ret = seesaw_register_read(client, SEESAW_GPIO_BASE, SEESAW_GPIO_BULK, + read_buf, sizeof(read_buf)); + if (ret) + return ret; + + data->button_state = ~get_unaligned_be32(&read_buf); + + ret = seesaw_register_read(client, SEESAW_ADC_BASE, + SEESAW_ADC_OFFSET + SEESAW_ANALOG_X, + (char *)&data->x, sizeof(data->x)); + 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(data->x); + + ret = seesaw_register_read(client, SEESAW_ADC_BASE, + SEESAW_ADC_OFFSET + SEESAW_ANALOG_Y, + (char *)&data->y, sizeof(data->y)); + if (ret) + return ret; + data->y = be16_to_cpu(data->y); + + 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 != 0) { + 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 (i = 0; i < ARRAY_SIZE(seesaw_buttons); i++) { + input_report_key(input, seesaw_buttons[i].code, + data.button_state & + BIT(seesaw_buttons[i].bit)); + } + input_sync(input); +} + +static int seesaw_probe(struct i2c_client *client) +{ + int err, i; + u8 hardware_id; + struct seesaw_gamepad *seesaw; + + err = seesaw_register_write_u8(client, SEESAW_STATUS_BASE, + SEESAW_STATUS_SWRST, 0xFF); + if (err) + return err; + + /* Wait for the registers to reset before proceeding */ + mdelay(10); + + seesaw = devm_kzalloc(&client->dev, sizeof(*seesaw), GFP_KERNEL); + if (!seesaw) + return -ENOMEM; + + err = seesaw_register_read(client, SEESAW_STATUS_BASE, + SEESAW_STATUS_HW_ID, &hardware_id, 1); + if (err) + return err; + + dev_dbg(&client->dev, "Adafruit Seesaw Gamepad, Hardware ID: %02x\n", + hardware_id); + + /* Set Pin Mode to input and enable pull-up resistors */ + err = seesaw_register_write_u32(client, SEESAW_GPIO_BASE, + SEESAW_GPIO_DIRCLR_BULK, + SEESAW_BUTTON_MASK); + if (err) + return err; + err = seesaw_register_write_u32(client, SEESAW_GPIO_BASE, + SEESAW_GPIO_PULLENSET, + SEESAW_BUTTON_MASK); + if (err) + return err; + err = seesaw_register_write_u32(client, SEESAW_GPIO_BASE, + SEESAW_GPIO_BULK_SET, + SEESAW_BUTTON_MASK); + if (err) + return err; + + seesaw->i2c_client = client; + i2c_set_clientdata(client, seesaw); + + 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); + for (i = 0; i < ARRAY_SIZE(seesaw_buttons); i++) { + input_set_capability(seesaw->input_dev, EV_KEY, + seesaw_buttons[i].code); + } + + err = input_setup_polling(seesaw->input_dev, seesaw_poll); + if (err) { + dev_err(&client->dev, "failed to set up polling: %d\n", err); + return err; + } + + 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); + + err = input_register_device(seesaw->input_dev); + if (err) { + dev_err(&client->dev, "failed to register joystick: %d\n", err); + return err; + } + + return 0; +} + +static const struct i2c_device_id seesaw_id_table[] = { + { SEESAW_DEVICE_NAME, 0 }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, seesaw_id_table); + +static struct i2c_driver seesaw_driver = { + .driver = { + .name = SEESAW_DEVICE_NAME, + }, + .id_table = seesaw_id_table, + .probe = seesaw_probe, +}; +module_i2c_driver(seesaw_driver); + +MODULE_AUTHOR("Anshul Dalal "); +MODULE_DESCRIPTION("Adafruit Mini I2C Gamepad driver"); +MODULE_LICENSE("GPL");