[PATCH 2/7] Input: psmouse - clean up code
From: Dmitry Torokhov
Date: Fri Jan 19 2018 - 18:07:22 EST
- switch to using BIT() macros
- use u8 instead of unsigned char for byte data
- use input_set_capability() instead of manipulating capabilities bits
directly
- use sign_extend32() when extracting wheel data.
- do not abuse -1 as error code, propagate errors from various calls.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/mouse/psmouse-base.c | 140 ++++++++++++++++++++-----------------
1 file changed, 77 insertions(+), 63 deletions(-)
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index 19f7727555911..cbca668bb931f 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -14,6 +14,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define psmouse_fmt(fmt) fmt
+#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -23,6 +24,7 @@
#include <linux/init.h>
#include <linux/libps2.h>
#include <linux/mutex.h>
+#include <linux/types.h>
#include "psmouse.h"
#include "synaptics.h"
@@ -147,7 +149,7 @@ void psmouse_report_standard_packet(struct input_dev *dev, u8 *packet)
psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
- unsigned char *packet = psmouse->packet;
+ u8 *packet = psmouse->packet;
if (psmouse->pktcnt < psmouse->pktsize)
return PSMOUSE_GOOD_DATA;
@@ -157,39 +159,42 @@ psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
switch (psmouse->protocol->type) {
case PSMOUSE_IMPS:
/* IntelliMouse has scroll wheel */
- input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
+ input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
break;
case PSMOUSE_IMEX:
/* Scroll wheel and buttons on IntelliMouse Explorer */
switch (packet[3] & 0xC0) {
case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
- input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
+ input_report_rel(dev, REL_WHEEL,
+ -sign_extend32(packet[3], 5));
break;
case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
- input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
+ input_report_rel(dev, REL_HWHEEL,
+ -sign_extend32(packet[3], 5));
break;
case 0x00:
case 0xC0:
- input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
- input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
- input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
+ input_report_rel(dev, REL_WHEEL,
+ -sign_extend32(packet[3], 3));
+ input_report_key(dev, BTN_SIDE, BIT(4));
+ input_report_key(dev, BTN_EXTRA, BIT(5));
break;
}
break;
case PSMOUSE_GENPS:
/* Report scroll buttons on NetMice */
- input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
+ input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
/* Extra buttons on Genius NewNet 3D */
- input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
- input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
+ input_report_key(dev, BTN_SIDE, BIT(6));
+ input_report_key(dev, BTN_EXTRA, BIT(7));
break;
case PSMOUSE_THINKPS:
/* Extra button on ThinkingMouse */
- input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
+ input_report_key(dev, BTN_EXTRA, BIT(3));
/*
* Without this bit of weirdness moving up gives wildly
@@ -203,8 +208,8 @@ psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
* Cortron PS2 Trackball reports SIDE button in the
* 4th bit of the first byte.
*/
- input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
- packet[0] |= 0x08;
+ input_report_key(dev, BTN_SIDE, BIT(3));
+ packet[0] |= BIT(3);
break;
default:
@@ -269,7 +274,7 @@ static int psmouse_handle_byte(struct psmouse *psmouse)
psmouse_notice(psmouse,
"issuing reconnect request\n");
serio_reconnect(psmouse->ps2dev.serio);
- return -1;
+ return -EIO;
}
}
psmouse->pktcnt = 0;
@@ -320,7 +325,7 @@ static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
* for normal processing or gathering them as command response.
*/
static irqreturn_t psmouse_interrupt(struct serio *serio,
- unsigned char data, unsigned int flags)
+ u8 data, unsigned int flags)
{
struct psmouse *psmouse = serio_get_drvdata(serio);
@@ -418,17 +423,20 @@ static irqreturn_t psmouse_interrupt(struct serio *serio,
* 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
* is the command.
*/
-int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
+int psmouse_sliced_command(struct psmouse *psmouse, u8 command)
{
int i;
+ int error;
- if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
- return -1;
+ error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
+ if (error)
+ return error;
for (i = 6; i >= 0; i -= 2) {
- unsigned char d = (command >> i) & 3;
- if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
- return -1;
+ u8 d = (command >> i) & 3;
+ error = ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES);
+ if (error)
+ return error;
}
return 0;
@@ -439,13 +447,15 @@ int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
*/
int psmouse_reset(struct psmouse *psmouse)
{
- unsigned char param[2];
+ u8 param[2];
+ int error;
- if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
- return -1;
+ error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT);
+ if (error)
+ return error;
if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
- return -1;
+ return -EIO;
return 0;
}
@@ -455,8 +465,8 @@ int psmouse_reset(struct psmouse *psmouse)
*/
void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
- static const unsigned char params[] = { 0, 1, 2, 2, 3 };
- unsigned char p;
+ static const u8 params[] = { 0, 1, 2, 2, 3 };
+ u8 p;
if (resolution == 0 || resolution > 200)
resolution = 200;
@@ -471,11 +481,12 @@ void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
*/
static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
{
- static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
- unsigned char r;
+ static const u8 rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
+ u8 r;
int i = 0;
- while (rates[i] > rate) i++;
+ while (rates[i] > rate)
+ i++;
r = rates[i];
ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
psmouse->rate = r;
@@ -547,7 +558,7 @@ bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
static int genius_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char param[4];
+ u8 param[4];
param[0] = 3;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
@@ -557,7 +568,7 @@ static int genius_detect(struct psmouse *psmouse, bool set_properties)
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
- return -1;
+ return -ENODEV;
if (set_properties) {
__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
@@ -579,7 +590,7 @@ static int genius_detect(struct psmouse *psmouse, bool set_properties)
static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char param[2];
+ u8 param[2];
param[0] = 200;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
@@ -590,7 +601,7 @@ static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 3)
- return -1;
+ return -ENODEV;
if (set_properties) {
__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
@@ -612,7 +623,7 @@ static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char param[2];
+ u8 param[2];
intellimouse_detect(psmouse, 0);
@@ -625,7 +636,7 @@ static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 4)
- return -1;
+ return -ENODEV;
/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
param[0] = 200;
@@ -658,8 +669,8 @@ static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
static int thinking_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char param[2];
- static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
+ u8 param[2];
+ static const u8 seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
int i;
param[0] = 10;
@@ -673,7 +684,7 @@ static int thinking_detect(struct psmouse *psmouse, bool set_properties)
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 2)
- return -1;
+ return -ENODEV;
if (set_properties) {
__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
@@ -701,7 +712,7 @@ static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
* We have no way of figuring true number of buttons so let's
* assume that the device has 3.
*/
- __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+ input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
}
return 0;
@@ -956,20 +967,17 @@ static void psmouse_apply_defaults(struct psmouse *psmouse)
{
struct input_dev *input_dev = psmouse->dev;
- memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
- memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
- memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
- memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
- memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
-
- __set_bit(EV_KEY, input_dev->evbit);
- __set_bit(EV_REL, input_dev->evbit);
+ bitmap_zero(input_dev->evbit, EV_CNT);
+ bitmap_zero(input_dev->keybit, KEY_CNT);
+ bitmap_zero(input_dev->relbit, REL_CNT);
+ bitmap_zero(input_dev->absbit, ABS_CNT);
+ bitmap_zero(input_dev->mscbit, MSC_CNT);
- __set_bit(BTN_LEFT, input_dev->keybit);
- __set_bit(BTN_RIGHT, input_dev->keybit);
+ input_set_capability(input_dev, EV_KEY, BTN_LEFT);
+ input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
- __set_bit(REL_X, input_dev->relbit);
- __set_bit(REL_Y, input_dev->relbit);
+ input_set_capability(input_dev, EV_REL, REL_X);
+ input_set_capability(input_dev, EV_REL, REL_Y);
__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
@@ -1239,7 +1247,8 @@ static int psmouse_extensions(struct psmouse *psmouse,
static int psmouse_probe(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char param[2];
+ u8 param[2];
+ int error;
/*
* First, we check if it's a mouse. It should send 0x00 or 0x03 in
@@ -1248,20 +1257,22 @@ static int psmouse_probe(struct psmouse *psmouse)
* subsequent ID queries, probably due to a firmware bug.
*/
param[0] = 0xa5;
- if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
- return -1;
+ error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
+ if (error)
+ return error;
if (param[0] != 0x00 && param[0] != 0x03 &&
param[0] != 0x04 && param[0] != 0xff)
- return -1;
+ return -ENODEV;
/*
* Then we reset and disable the mouse so that it doesn't generate
* events.
*/
- if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
- psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
- ps2dev->serio->phys);
+ error = ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+ if (error)
+ psmouse_warn(psmouse, "Failed to reset mouse on %s: %d\n",
+ ps2dev->serio->phys, error);
return 0;
}
@@ -1302,10 +1313,13 @@ int psmouse_activate(struct psmouse *psmouse)
*/
int psmouse_deactivate(struct psmouse *psmouse)
{
- if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
- psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
- psmouse->ps2dev.serio->phys);
- return -1;
+ int error;
+
+ error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
+ if (error) {
+ psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
+ psmouse->ps2dev.serio->phys, error);
+ return error;
}
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
--
2.16.0.rc1.238.g530d649a79-goog