[PATCHv5] lis3lv02d: support both one- and two-byte sensors
From: Giuseppe Bilotta
Date: Tue Feb 10 2009 - 19:53:34 EST
Sensors responding with 0x3B to WHO_AM_I only have one data register per
direction, thus returning a signed byte from the position which is
occupied by the MSB in sensors responding with 0x3A.
We support both kind of sensors by checking for the sensor type on init
and defining appropriate data-access routines and sensor limits (for the
joystick) depending on what we find.
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@xxxxxxxxx>
---
As Eric pointed out, the 8 vs 16 bit check should be done at sensor init
time, in hp_accel.c, and not at joystick poweron time on lis3lv02d.c ...
drivers/hwmon/hp_accel.c | 37 ++++++++++++++++++++++++++++++++-----
drivers/hwmon/lis3lv02d.c | 26 +++++++-------------------
drivers/hwmon/lis3lv02d.h | 12 +++++++++++-
3 files changed, 50 insertions(+), 25 deletions(-)
diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index d71e4bd..51375f6 100644
--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -238,9 +238,25 @@ static void lis3lv02d_enum_resources(struct acpi_device *device)
printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
}
+static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
+{
+ u8 lo, hi;
+
+ adev.read(handle, reg - 1, &lo);
+ adev.read(handle, reg, &hi);
+ /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
+ return (s16)((hi << 8) | lo);
+}
+
+static s16 lis3lv02d_read_8(acpi_handle handle, int reg)
+{
+ s8 lo;
+ adev.read(handle, reg, &lo);
+ return lo;
+}
+
static int lis3lv02d_add(struct acpi_device *device)
{
- u8 val;
int ret;
if (!device)
@@ -254,10 +270,21 @@ static int lis3lv02d_add(struct acpi_device *device)
strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
device->driver_data = &adev;
- lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
- if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
- printk(KERN_ERR DRIVER_NAME
- ": Accelerometer chip not LIS3LV02D{L,Q}\n");
+ lis3lv02d_acpi_read(device->handle, WHO_AM_I, &adev.whoami);
+ switch (adev.whoami) {
+ case LIS3LV02DL_ID:
+ printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n");
+ adev.lis3lv02d_read = lis3lv02d_read_16;
+ adev.mdps_max_val = 2048;
+ break;
+ case LIS302DL_ID:
+ printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n");
+ adev.lis3lv02d_read = lis3lv02d_read_8;
+ adev.mdps_max_val = 128;
+ break;
+ default:
+ printk(KERN_ERR DRIVER_NAME
+ ": unknown sensor type 0x%X\n", adev.whoami);
}
/* If possible use a "standard" axes order */
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index 3afa3af..0d068da 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -53,9 +53,6 @@
* joystick.
*/
-/* Maximum value our axis may get for the input device (signed 12 bits) */
-#define MDPS_MAX_VAL 2048
-
struct acpi_lis3lv02d adev = {
.misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(adev.misc_wait),
};
@@ -64,16 +61,6 @@ EXPORT_SYMBOL_GPL(adev);
static int lis3lv02d_add_fs(struct acpi_device *device);
-static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
-{
- u8 lo, hi;
-
- adev.read(handle, reg, &lo);
- adev.read(handle, reg + 1, &hi);
- /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
- return (s16)((hi << 8) | lo);
-}
-
/**
* lis3lv02d_get_axis - For the given axis, give the value converted
* @axis: 1,2,3 - can also be negative
@@ -102,9 +89,9 @@ static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
{
int position[3];
- position[0] = lis3lv02d_read_16(handle, OUTX_L);
- position[1] = lis3lv02d_read_16(handle, OUTY_L);
- position[2] = lis3lv02d_read_16(handle, OUTZ_L);
+ position[0] = adev.lis3lv02d_read(handle, OUTX);
+ position[1] = adev.lis3lv02d_read(handle, OUTY);
+ position[2] = adev.lis3lv02d_read(handle, OUTZ);
*x = lis3lv02d_get_axis(adev.ac.x, position);
*y = lis3lv02d_get_axis(adev.ac.y, position);
@@ -121,6 +108,7 @@ void lis3lv02d_poweron(acpi_handle handle)
{
adev.is_on = 1;
adev.init(handle);
+ adev.read(handle, WHO_AM_I, &adev.whoami);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
@@ -355,9 +343,9 @@ int lis3lv02d_joystick_enable(void)
adev.idev->close = lis3lv02d_joystick_close;
set_bit(EV_ABS, adev.idev->evbit);
- input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
- input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
- input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
+ input_set_abs_params(adev.idev, ABS_X, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
+ input_set_abs_params(adev.idev, ABS_Y, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
+ input_set_abs_params(adev.idev, ABS_Z, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
err = input_register_device(adev.idev);
if (err) {
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 2e7597c..cd0e838 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -22,11 +22,14 @@
/*
* The actual chip is STMicroelectronics LIS3LV02DL or LIS3LV02DQ that seems to
* be connected via SPI. There exists also several similar chips (such as LIS302DL or
- * LIS3L02DQ) but not in the HP laptops and they have slightly different registers.
+ * LIS3L02DQ) and they have slightly different registers, but we can provide a
+ * common interface for all of them.
* They can also be connected via I²C.
*/
+/* 2-byte registers */
#define LIS3LV02DL_ID 0x3A /* Also the LIS3LV02DQ */
+/* 1-byte registers */
#define LIS302DL_ID 0x3B /* Also the LIS202DL! */
enum lis3lv02d_reg {
@@ -44,10 +47,13 @@ enum lis3lv02d_reg {
STATUS_REG = 0x27,
OUTX_L = 0x28,
OUTX_H = 0x29,
+ OUTX = 0x29,
OUTY_L = 0x2A,
OUTY_H = 0x2B,
+ OUTY = 0x2B,
OUTZ_L = 0x2C,
OUTZ_H = 0x2D,
+ OUTZ = 0x2D,
FF_WU_CFG = 0x30,
FF_WU_SRC = 0x31,
FF_WU_ACK = 0x32,
@@ -159,6 +165,10 @@ struct acpi_lis3lv02d {
acpi_status (*write) (acpi_handle handle, int reg, u8 val);
acpi_status (*read) (acpi_handle handle, int reg, u8 *ret);
+ u8 whoami; /* 3Ah: 2-byte registries, 3Bh: 1-byte registries */
+ s16 (*lis3lv02d_read) (acpi_handle handle, int reg);
+ int mdps_max_val;
+
struct input_dev *idev; /* input device */
struct task_struct *kthread; /* kthread for input */
struct mutex lock;
--
1.6.2.rc0.173.g5e148
--
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