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[76.183.134.35]) by smtp.gmail.com with ESMTPSA id f189-20020aca38c6000000b0033a45705cb2sm831512oia.8.2022.07.21.09.46.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jul 2022 09:46:11 -0700 (PDT) From: Chris Morgan To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, heiko@sntech.de, contact@artur-rojek.eu, jic23@kernel.org, paul@crapouillou.net, linux-iio@vger.kernel.org, Chris Morgan , Maya Matuszczyk Subject: [PATCH v8 2/3] Input: adc-joystick - Add polled input device support Date: Thu, 21 Jul 2022 11:46:02 -0500 Message-Id: <20220721164603.13534-3-macroalpha82@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220721164603.13534-1-macroalpha82@gmail.com> References: <20220721164603.13534-1-macroalpha82@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Chris Morgan Add polled input device support to the adc-joystick driver. This is useful for devices which do not have hardware capable triggers on their SARADC. Code modified from adc-joystick.c changes made by Maya Matuszczyk. Signed-off-by: Maya Matuszczyk Signed-off-by: Chris Morgan --- drivers/input/joystick/adc-joystick.c | 82 ++++++++++++++++++++------- 1 file changed, 62 insertions(+), 20 deletions(-) diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c index 78ebca7d400a..085b8e10dfb5 100644 --- a/drivers/input/joystick/adc-joystick.c +++ b/drivers/input/joystick/adc-joystick.c @@ -26,8 +26,23 @@ struct adc_joystick { struct adc_joystick_axis *axes; struct iio_channel *chans; int num_chans; + bool polled; }; +static void adc_joystick_poll(struct input_dev *input) +{ + struct adc_joystick *joy = input_get_drvdata(input); + int i, val, ret; + + for (i = 0; i < joy->num_chans; i++) { + ret = iio_read_channel_raw(&joy->chans[i], &val); + if (ret < 0) + return; + input_report_abs(input, joy->axes[i].code, val); + } + input_sync(input); +} + static int adc_joystick_handle(const void *data, void *private) { struct adc_joystick *joy = private; @@ -178,7 +193,9 @@ static int adc_joystick_probe(struct platform_device *pdev) struct input_dev *input; int error; int bits; + int chan_storage; int i; + unsigned int poll_interval; joy = devm_kzalloc(dev, sizeof(*joy), GFP_KERNEL); if (!joy) @@ -192,16 +209,31 @@ static int adc_joystick_probe(struct platform_device *pdev) return error; } - /* Count how many channels we got. NULL terminated. */ + if (device_property_present(dev, "poll-interval")) { + error = device_property_read_u32(dev, "poll-interval", + &poll_interval); + if (error) + return error; + joy->polled = true; + } + + /* Count how many channels we got. NULL terminated. Do not check the + * storage size if using polling. + */ + chan_storage = joy->chans[0].channel->scan_type.storagebits; for (i = 0; joy->chans[i].indio_dev; i++) { - bits = joy->chans[i].channel->scan_type.storagebits; - if (!bits || bits > 16) { - dev_err(dev, "Unsupported channel storage size\n"); - return -EINVAL; - } - if (bits != joy->chans[0].channel->scan_type.storagebits) { - dev_err(dev, "Channels must have equal storage size\n"); - return -EINVAL; + if (!joy->polled) { + bits = joy->chans[i].channel->scan_type.storagebits; + if (!bits || bits > 16) { + dev_err(dev, + "Unsupported channel storage size\n"); + return -EINVAL; + } + if (bits != chan_storage) { + dev_err(dev, + "Channels must be equal size\n"); + return -EINVAL; + } } } joy->num_chans = i; @@ -215,8 +247,14 @@ static int adc_joystick_probe(struct platform_device *pdev) joy->input = input; input->name = pdev->name; input->id.bustype = BUS_HOST; - input->open = adc_joystick_open; - input->close = adc_joystick_close; + + if (joy->polled) { + input_setup_polling(input, adc_joystick_poll); + input_set_poll_interval(input, poll_interval); + } else { + input->open = adc_joystick_open; + input->close = adc_joystick_close; + } error = adc_joystick_set_axes(dev, joy); if (error) @@ -229,16 +267,20 @@ static int adc_joystick_probe(struct platform_device *pdev) return error; } - joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy); - if (IS_ERR(joy->buffer)) { - dev_err(dev, "Unable to allocate callback buffer\n"); - return PTR_ERR(joy->buffer); - } + if (!joy->polled) { + joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, + joy); + if (IS_ERR(joy->buffer)) { + dev_err(dev, "Unable to allocate callback buffer\n"); + return PTR_ERR(joy->buffer); + } - error = devm_add_action_or_reset(dev, adc_joystick_cleanup, joy->buffer); - if (error) { - dev_err(dev, "Unable to add action\n"); - return error; + error = devm_add_action_or_reset(dev, adc_joystick_cleanup, + joy->buffer); + if (error) { + dev_err(dev, "Unable to add action\n"); + return error; + } } return 0;