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[92.247.61.126]) by smtp.gmail.com with ESMTPSA id a21sm2530579wmb.38.2020.11.19.19.01.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Nov 2020 19:01:08 -0800 (PST) From: Matt Ranostay To: linux-iio@vger.kernel.org, linux-input@vger.kernel.org Cc: Matt Ranostay , Rishi Gupta Subject: [PATCH] HID: mcp2221: add ADC support Date: Fri, 20 Nov 2020 05:01:03 +0200 Message-Id: <20201120030103.36138-1-matt.ranostay@konsulko.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add support for the three 10-bit ADC channels registered via the IIO subsystem. Cc: linux-input@vger.kernel.org Cc: linux-iio@vger.kernel.org CC: Rishi Gupta Signed-off-by: Matt Ranostay --- drivers/hid/Kconfig | 1 + drivers/hid/hid-mcp2221.c | 65 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 65 insertions(+), 1 deletion(-) diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 05315b434276..4795744d9979 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -1157,6 +1157,7 @@ config HID_MCP2221 tristate "Microchip MCP2221 HID USB-to-I2C/SMbus host support" depends on USB_HID && I2C depends on GPIOLIB + depends on IIO help Provides I2C and SMBUS host adapter functionality over USB-HID through MCP2221 device. diff --git a/drivers/hid/hid-mcp2221.c b/drivers/hid/hid-mcp2221.c index 0d27ccb55dd9..7e62f1dc54d3 100644 --- a/drivers/hid/hid-mcp2221.c +++ b/drivers/hid/hid-mcp2221.c @@ -18,6 +18,9 @@ #include #include "hid-ids.h" +#include +#include + /* Commands codes in a raw output report */ enum { MCP2221_I2C_WR_DATA = 0x90, @@ -56,6 +59,7 @@ enum { */ struct mcp2221 { struct hid_device *hdev; + struct iio_dev *indio_dev; struct i2c_adapter adapter; struct mutex lock; struct completion wait_in_report; @@ -67,6 +71,11 @@ struct mcp2221 { struct gpio_chip *gc; u8 gp_idx; u8 gpio_dir; + u16 adc_values[3]; +}; + +struct mcp2221_iio { + struct mcp2221 *mcp; }; /* @@ -712,6 +721,7 @@ static int mcp2221_raw_event(struct hid_device *hdev, break; } mcp->status = mcp_get_i2c_eng_state(mcp, data, 8); + memcpy(&mcp->adc_values, &data[50], 6); break; default: mcp->status = -EIO; @@ -791,11 +801,54 @@ static int mcp2221_raw_event(struct hid_device *hdev, return 1; } +static int mcp2221_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int *val, + int *val2, long mask) +{ + + struct mcp2221_iio *priv = iio_priv(indio_dev); + struct mcp2221 *mcp = priv->mcp; + int ret; + + mutex_lock(&mcp->lock); + + /* Read ADC values */ + ret = mcp_chk_last_cmd_status(mcp); + if (ret < 0) + return ret; + + *val = le16_to_cpu(mcp->adc_values[channel->channel]); + + mutex_unlock(&mcp->lock); + + return IIO_VAL_INT; +} + +static const struct iio_info mcp2221_info = { + .read_raw = &mcp2221_read_raw, +}; + +#define MCP2221_ADC_CHANNEL(idx) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = idx, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .scan_index = -1, \ + } + +static const struct iio_chan_spec mcp2221_channels[] = { + MCP2221_ADC_CHANNEL(0), + MCP2221_ADC_CHANNEL(1), + MCP2221_ADC_CHANNEL(2), +}; + static int mcp2221_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; struct mcp2221 *mcp; + struct mcp2221_iio *iio; mcp = devm_kzalloc(&hdev->dev, sizeof(*mcp), GFP_KERNEL); if (!mcp) @@ -869,8 +922,17 @@ static int mcp2221_probe(struct hid_device *hdev, if (ret) goto err_gc; - return 0; + mcp->indio_dev = devm_iio_device_alloc(&hdev->dev, sizeof(*iio)); + iio = iio_priv(mcp->indio_dev); + iio->mcp = mcp; + + mcp->indio_dev->name = "mcp2221_adc"; + mcp->indio_dev->modes = INDIO_DIRECT_MODE; + mcp->indio_dev->info = &mcp2221_info; + mcp->indio_dev->channels = mcp2221_channels; + mcp->indio_dev->num_channels = ARRAY_SIZE(mcp2221_channels); + return iio_device_register(mcp->indio_dev); err_gc: i2c_del_adapter(&mcp->adapter); err_i2c: @@ -884,6 +946,7 @@ static void mcp2221_remove(struct hid_device *hdev) { struct mcp2221 *mcp = hid_get_drvdata(hdev); + iio_device_unregister(mcp->indio_dev); i2c_del_adapter(&mcp->adapter); hid_hw_close(mcp->hdev); hid_hw_stop(mcp->hdev);