diff options
| author | Andrea Galbusera <gizero@gmail.com> | 2015-07-14 16:36:21 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-07-20 20:41:16 +0300 |
| commit | f686a36b4b79782a94f07769fb1c0187d24ea8a8 (patch) | |
| tree | c8ef1c06d8dde3caeff5c1f171c7bb087c7f2b8b /drivers/iio/adc/mcp320x.c | |
| parent | 47764c7918f5dd648ae8f6f61db1aaab1b9c09dd (diff) | |
| download | linux-f686a36b4b79782a94f07769fb1c0187d24ea8a8.tar.xz | |
iio: adc: mcp320x: Add support for mcp3301
This adds support for Microchip's 13 bit 1 channel AD converter MCP3301
Signed-off-by: Andrea Galbusera <gizero@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/adc/mcp320x.c')
| -rw-r--r-- | drivers/iio/adc/mcp320x.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c index 8d9c9b9215dd..72969c8a0a51 100644 --- a/drivers/iio/adc/mcp320x.c +++ b/drivers/iio/adc/mcp320x.c @@ -25,6 +25,7 @@ * http://ww1.microchip.com/downloads/en/DeviceDoc/21290D.pdf mcp3201 * http://ww1.microchip.com/downloads/en/DeviceDoc/21034D.pdf mcp3202 * http://ww1.microchip.com/downloads/en/DeviceDoc/21298c.pdf mcp3204/08 + * http://ww1.microchip.com/downloads/en/DeviceDoc/21700E.pdf mcp3301 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -47,6 +48,7 @@ enum { mcp3202, mcp3204, mcp3208, + mcp3301, }; struct mcp320x_chip_info { @@ -76,6 +78,7 @@ static int mcp320x_channel_to_tx_data(int device_index, switch (device_index) { case mcp3001: case mcp3201: + case mcp3301: return 0; case mcp3002: case mcp3202: @@ -102,7 +105,7 @@ static int mcp320x_adc_conversion(struct mcp320x *adc, u8 channel, adc->tx_buf = mcp320x_channel_to_tx_data(device_index, channel, differential); - if (device_index != mcp3001 && device_index != mcp3201) { + if (device_index != mcp3001 && device_index != mcp3201 && device_index != mcp3301) { ret = spi_sync(adc->spi, &adc->msg); if (ret < 0) return ret; @@ -125,6 +128,8 @@ static int mcp320x_adc_conversion(struct mcp320x *adc, u8 channel, case mcp3204: case mcp3208: return (adc->rx_buf[0] << 4 | adc->rx_buf[1] >> 4); + case mcp3301: + return sign_extend32((adc->rx_buf[0] & 0x1f) << 8 | adc->rx_buf[1], 12); default: return -EINVAL; } @@ -274,6 +279,11 @@ static const struct mcp320x_chip_info mcp320x_chip_infos[] = { .num_channels = ARRAY_SIZE(mcp3208_channels), .resolution = 12 }, + [mcp3301] = { + .channels = mcp3201_channels, + .num_channels = ARRAY_SIZE(mcp3201_channels), + .resolution = 13 + }, }; static int mcp320x_probe(struct spi_device *spi) @@ -367,6 +377,9 @@ static const struct of_device_id mcp320x_dt_ids[] = { .compatible = "mcp3208", .data = &mcp320x_chip_infos[mcp3208], }, { + .compatible = "mcp3301", + .data = &mcp320x_chip_infos[mcp3301], + }, { } }; MODULE_DEVICE_TABLE(of, mcp320x_dt_ids); @@ -381,6 +394,7 @@ static const struct spi_device_id mcp320x_id[] = { { "mcp3202", mcp3202 }, { "mcp3204", mcp3204 }, { "mcp3208", mcp3208 }, + { "mcp3301", mcp3301 }, { } }; MODULE_DEVICE_TABLE(spi, mcp320x_id); |