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Groups > linux.kernel > #1450177
| From | Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 4.4 098/146] iio:st_pressure: fix sampling gains (bring inline with ABI) |
| Date | 2016-07-26 00:40 +0200 |
| Message-ID | <rYWHw-2cA-25@gated-at.bofh.it> (permalink) |
| References | <rYV8K-Pn-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gregor Boirie <gregor.boirie@parrot.com>
commit d43a41152f8e9e4c0d19850884d1fada076dee10 upstream.
Temperature channels report scaled samples in Celsius although expected as
milli degree Celsius in Documentation/ABI/testing/sysfs-bus-iio.
Gains are not implemented at all for LPS001WP pressure and temperature
channels.
This patch ensures that proper offsets and scales are exposed to userpace
for both pressure and temperature channels.
Also fix a NULL pointer exception when userspace reads content of sysfs
scale attribute when gains are not defined.
Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/pressure/st_pressure_core.c | 80 ++++++++++++++++++++------------
1 file changed, 50 insertions(+), 30 deletions(-)
--- a/drivers/iio/pressure/st_pressure_core.c
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -28,15 +28,21 @@
#include <linux/iio/common/st_sensors.h>
#include "st_pressure.h"
+#define MCELSIUS_PER_CELSIUS 1000
+
+/* Default pressure sensitivity */
#define ST_PRESS_LSB_PER_MBAR 4096UL
#define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
ST_PRESS_LSB_PER_MBAR)
+
+/* Default temperature sensitivity */
#define ST_PRESS_LSB_PER_CELSIUS 480UL
-#define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \
- ST_PRESS_LSB_PER_CELSIUS)
+#define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
+
#define ST_PRESS_NUMBER_DATA_CHANNELS 1
/* FULLSCALE */
+#define ST_PRESS_FS_AVL_1100MB 1100
#define ST_PRESS_FS_AVL_1260MB 1260
#define ST_PRESS_1_OUT_XL_ADDR 0x28
@@ -54,18 +60,20 @@
#define ST_PRESS_LPS331AP_PW_MASK 0x80
#define ST_PRESS_LPS331AP_FS_ADDR 0x23
#define ST_PRESS_LPS331AP_FS_MASK 0x30
-#define ST_PRESS_LPS331AP_FS_AVL_1260_VAL 0x00
-#define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
-#define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
#define ST_PRESS_LPS331AP_BDU_ADDR 0x20
#define ST_PRESS_LPS331AP_BDU_MASK 0x04
#define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22
#define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04
#define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20
#define ST_PRESS_LPS331AP_MULTIREAD_BIT true
-#define ST_PRESS_LPS331AP_TEMP_OFFSET 42500
/* CUSTOM VALUES FOR LPS001WP SENSOR */
+
+/* LPS001WP pressure resolution */
+#define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
+/* LPS001WP temperature resolution */
+#define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
+
#define ST_PRESS_LPS001WP_WAI_EXP 0xba
#define ST_PRESS_LPS001WP_ODR_ADDR 0x20
#define ST_PRESS_LPS001WP_ODR_MASK 0x30
@@ -74,6 +82,8 @@
#define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03
#define ST_PRESS_LPS001WP_PW_ADDR 0x20
#define ST_PRESS_LPS001WP_PW_MASK 0x40
+#define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
+ (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
#define ST_PRESS_LPS001WP_BDU_ADDR 0x20
#define ST_PRESS_LPS001WP_BDU_MASK 0x04
#define ST_PRESS_LPS001WP_MULTIREAD_BIT true
@@ -90,18 +100,12 @@
#define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04
#define ST_PRESS_LPS25H_PW_ADDR 0x20
#define ST_PRESS_LPS25H_PW_MASK 0x80
-#define ST_PRESS_LPS25H_FS_ADDR 0x00
-#define ST_PRESS_LPS25H_FS_MASK 0x00
-#define ST_PRESS_LPS25H_FS_AVL_1260_VAL 0x00
-#define ST_PRESS_LPS25H_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
-#define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
#define ST_PRESS_LPS25H_BDU_ADDR 0x20
#define ST_PRESS_LPS25H_BDU_MASK 0x04
#define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23
#define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01
#define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10
#define ST_PRESS_LPS25H_MULTIREAD_BIT true
-#define ST_PRESS_LPS25H_TEMP_OFFSET 42500
#define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
#define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
@@ -153,7 +157,9 @@ static const struct iio_chan_spec st_pre
.storagebits = 16,
.endianness = IIO_LE,
},
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
.modified = 0,
},
{
@@ -169,7 +175,7 @@ static const struct iio_chan_spec st_pre
},
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_OFFSET),
+ BIT(IIO_CHAN_INFO_SCALE),
.modified = 0,
},
IIO_CHAN_SOFT_TIMESTAMP(1)
@@ -204,11 +210,14 @@ static const struct st_sensor_settings s
.addr = ST_PRESS_LPS331AP_FS_ADDR,
.mask = ST_PRESS_LPS331AP_FS_MASK,
.fs_avl = {
+ /*
+ * Pressure and temperature sensitivity values
+ * as defined in table 3 of LPS331AP datasheet.
+ */
[0] = {
.num = ST_PRESS_FS_AVL_1260MB,
- .value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
- .gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
- .gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
+ .gain = ST_PRESS_KPASCAL_NANO_SCALE,
+ .gain2 = ST_PRESS_LSB_PER_CELSIUS,
},
},
},
@@ -248,7 +257,17 @@ static const struct st_sensor_settings s
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
- .addr = 0,
+ .fs_avl = {
+ /*
+ * Pressure and temperature resolution values
+ * as defined in table 3 of LPS001WP datasheet.
+ */
+ [0] = {
+ .num = ST_PRESS_FS_AVL_1100MB,
+ .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
+ .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
+ },
+ },
},
.bdu = {
.addr = ST_PRESS_LPS001WP_BDU_ADDR,
@@ -285,14 +304,15 @@ static const struct st_sensor_settings s
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
- .addr = ST_PRESS_LPS25H_FS_ADDR,
- .mask = ST_PRESS_LPS25H_FS_MASK,
.fs_avl = {
+ /*
+ * Pressure and temperature sensitivity values
+ * as defined in table 3 of LPS25H datasheet.
+ */
[0] = {
.num = ST_PRESS_FS_AVL_1260MB,
- .value = ST_PRESS_LPS25H_FS_AVL_1260_VAL,
- .gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN,
- .gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN,
+ .gain = ST_PRESS_KPASCAL_NANO_SCALE,
+ .gain2 = ST_PRESS_LSB_PER_CELSIUS,
},
},
},
@@ -346,26 +366,26 @@ static int st_press_read_raw(struct iio_
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- *val = 0;
-
switch (ch->type) {
case IIO_PRESSURE:
+ *val = 0;
*val2 = press_data->current_fullscale->gain;
- break;
+ return IIO_VAL_INT_PLUS_NANO;
case IIO_TEMP:
+ *val = MCELSIUS_PER_CELSIUS;
*val2 = press_data->current_fullscale->gain2;
- break;
+ return IIO_VAL_FRACTIONAL;
default:
err = -EINVAL;
goto read_error;
}
- return IIO_VAL_INT_PLUS_NANO;
case IIO_CHAN_INFO_OFFSET:
switch (ch->type) {
case IIO_TEMP:
- *val = 425;
- *val2 = 10;
+ *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
+ press_data->current_fullscale->gain2;
+ *val2 = MCELSIUS_PER_CELSIUS;
break;
default:
err = -EINVAL;
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[PATCH 4.4 080/146] drm/nouveau/disp/sor/gf119: select correct sor when poking training pattern Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
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[PATCH 4.4 068/146] btrfs: account for non-CoWd blocks in btrfs_abort_transaction Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 023/146] x86, build: copy ldlinux.c32 to image.iso Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 065/146] af_unix: fix hard linked sockets on overlay Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 019/146] of: irq: fix of_irq_get[_byname]() kernel-doc Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 073/146] drm/amdkfd: destroy dbgmgr in notifier release Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 075/146] virtio_balloon: fix PFN format for virtio-1 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 018/146] of: fix autoloading due to broken modalias with no compatible Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 074/146] drm/dp/mst: Always clear proposed vcpi table for port. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 056/146] tracing: Handle NULL formats in hold_module_trace_bprintk_format() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 014/146] usb: common: otg-fsm: add license to usb-otg-fsm Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 020/146] locking/ww_mutex: Report recursive ww_mutex locking early Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 070/146] drm/amdgpu/gfx7: fix broken condition check Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 021/146] locking/qspinlock: Fix spin_unlock_wait() some more Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 057/146] base: make module_create_drivers_dir race-free Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 076/146] drm/nouveau/disp/sor/gf119: both links use the same training register Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 067/146] percpu: fix synchronization between synchronous map extension and chunk destruction Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
[PATCH 4.4 069/146] drm/radeon: fix asic initialization for virtualized environments Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:50 +0200
Re: [PATCH 4.4 000/146] 4.4.16-stable review Shuah Khan <shuah.kh@samsung.com> - 2016-07-26 04:10 +0200
Re: [PATCH 4.4 000/146] 4.4.16-stable review Guenter Roeck <linux@roeck-us.net> - 2016-07-26 16:00 +0200
Re: [PATCH 4.4 000/146] 4.4.16-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-27 06:50 +0200
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