From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756820AbZBKANh (ORCPT ); Tue, 10 Feb 2009 19:13:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754719AbZBKAN2 (ORCPT ); Tue, 10 Feb 2009 19:13:28 -0500 Received: from mail-fx0-f25.google.com ([209.85.220.25]:36249 "EHLO mail-fx0-f25.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754187AbZBKAN2 (ORCPT ); Tue, 10 Feb 2009 19:13:28 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer; b=XAEGBip5MNzaGhz4XYlmFOWte01sS8vqYhNJkM9lhqEU0OMJVCPQCK+himLu4utf8W MjCDv5VZiMlEq7BoCNxytZoCzP4oy4yscM/XE9R0okylQwuAFeCh83Lfx3N8KS+jQ+cR zgnIEmV13NUtvAK5Q26xhF1WSTknqK8njXg4Q= From: Giuseppe Bilotta To: linux-kernel@vger.kernel.org Cc: =?utf-8?q?=C3=89ric=20Piel?= , Pavel Machek , Andrew Morton , Giuseppe Bilotta Subject: [PATCHv4 (resend)] lis3lv02d: support both one- and two-byte sensors Date: Wed, 11 Feb 2009 01:13:23 +0100 Message-Id: <1234311203-14871-1-git-send-email-giuseppe.bilotta@gmail.com> X-Mailer: git-send-email 1.6.2.rc0.173.g5e148 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- Sorry for the mess, sent by mistake to the git instead of kernel mailing list. /me should probably stop hacking at 1am drivers/hwmon/lis3lv02d.c | 41 ++++++++++++++++++++++++++++++----------- drivers/hwmon/lis3lv02d.h | 12 +++++++++++- 2 files changed, 41 insertions(+), 12 deletions(-) diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c index 3afa3af..0f6528f 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), }; @@ -68,12 +65,19 @@ static s16 lis3lv02d_read_16(acpi_handle handle, int reg) { u8 lo, hi; - adev.read(handle, reg, &lo); - adev.read(handle, reg + 1, &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; +} + /** * lis3lv02d_get_axis - For the given axis, give the value converted * @axis: 1,2,3 - can also be negative @@ -102,9 +106,9 @@ 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 +125,21 @@ void lis3lv02d_poweron(acpi_handle handle) { adev.is_on = 1; adev.init(handle); + adev.read(handle, WHO_AM_I, &adev.whoami); + /* Tell apart LISxLV02Dy from LISx02Dy family by checking the LSB + * (0x3A vs 0x3B). TODO More sophisticated checks on other registers + * could be implemented, for example to see if we have 2 or 3 axes, and + * configure the joystick accordingly. + */ + if (adev.whoami & 1) { + printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n"); + adev.lis3lv02d_read = lis3lv02d_read_8; + adev.mdps_max_val = 128; + } else { + printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n"); + adev.lis3lv02d_read = lis3lv02d_read_16; + adev.mdps_max_val = 2048; + } } EXPORT_SYMBOL_GPL(lis3lv02d_poweron); @@ -355,9 +374,9 @@ 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