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SubjectRe: [PATCH 4/4] Input: synaptics - use u8 instead of unsigned char
On Mar 24 2017 or thereabouts, Dmitry Torokhov wrote:
> The rest of the kernel uses u8, u16, etc for data coming form hardware,
> let's switch ti using u8 here as well.
>
> Also turn pkt_type into an enum.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> ---

The series looks good to me:
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

Cheers,
Benjamin

> drivers/input/mouse/synaptics.c | 60 ++++++++++++++++++++---------------------
> drivers/input/mouse/synaptics.h | 22 ++++++++-------
> 2 files changed, 42 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 224269c849bb..0b99c8732306 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -79,9 +79,9 @@
> /*
> * Set the synaptics touchpad mode byte by special commands
> */
> -static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
> +static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)
> {
> - unsigned char param[1];
> + u8 param[1];
> int error;
>
> error = psmouse_sliced_command(psmouse, mode);
> @@ -99,7 +99,7 @@ static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
> int synaptics_detect(struct psmouse *psmouse, bool set_properties)
> {
> struct ps2dev *ps2dev = &psmouse->ps2dev;
> - unsigned char param[4];
> + u8 param[4];
>
> param[0] = 0;
>
> @@ -186,12 +186,11 @@ static const char * const forcepad_pnp_ids[] = {
> /*
> * Send a command to the synpatics touchpad by special commands
> */
> -static int synaptics_send_cmd(struct psmouse *psmouse,
> - unsigned char c, unsigned char *param)
> +static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
> {
> int error;
>
> - error = psmouse_sliced_command(psmouse, c);
> + error = psmouse_sliced_command(psmouse, cmd);
> if (error)
> return error;
>
> @@ -261,7 +260,7 @@ static int synaptics_firmware_id(struct psmouse *psmouse,
> static int synaptics_query_modes(struct psmouse *psmouse,
> struct synaptics_device_info *info)
> {
> - unsigned char bid[3];
> + u8 bid[3];
> int error;
>
> /* firmwares prior 7.5 have no board_id encoded */
> @@ -345,7 +344,7 @@ static int synaptics_capability(struct psmouse *psmouse,
> static int synaptics_resolution(struct psmouse *psmouse,
> struct synaptics_device_info *info)
> {
> - unsigned char resp[3];
> + u8 resp[3];
> int error;
>
> if (SYN_ID_MAJOR(info->identity) < 4)
> @@ -537,7 +536,7 @@ static void synaptics_apply_quirks(struct psmouse *psmouse,
>
> static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
> {
> - static unsigned char param = 0xc8;
> + static u8 param = 0xc8;
> struct synaptics_data *priv = psmouse->private;
> int error;
>
> @@ -609,7 +608,7 @@ static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
> /*****************************************************************************
> * Synaptics pass-through PS/2 port support
> ****************************************************************************/
> -static int synaptics_pt_write(struct serio *serio, unsigned char c)
> +static int synaptics_pt_write(struct serio *serio, u8 c)
> {
> struct psmouse *parent = serio_get_drvdata(serio->parent);
> u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
> @@ -648,13 +647,12 @@ static void synaptics_pt_stop(struct serio *serio)
> serio_continue_rx(parent->ps2dev.serio);
> }
>
> -static int synaptics_is_pt_packet(unsigned char *buf)
> +static int synaptics_is_pt_packet(u8 *buf)
> {
> return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
> }
>
> -static void synaptics_pass_pt_packet(struct serio *ptport,
> - unsigned char *packet)
> +static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
> {
> struct psmouse *child = serio_get_drvdata(ptport);
>
> @@ -717,7 +715,7 @@ static void synaptics_pt_create(struct psmouse *psmouse)
> * Functions to interpret the absolute mode packets
> ****************************************************************************/
>
> -static void synaptics_parse_agm(const unsigned char buf[],
> +static void synaptics_parse_agm(const u8 buf[],
> struct synaptics_data *priv,
> struct synaptics_hw_state *hw)
> {
> @@ -746,7 +744,7 @@ static void synaptics_parse_agm(const unsigned char buf[],
> }
> }
>
> -static void synaptics_parse_ext_buttons(const unsigned char buf[],
> +static void synaptics_parse_ext_buttons(const u8 buf[],
> struct synaptics_data *priv,
> struct synaptics_hw_state *hw)
> {
> @@ -758,7 +756,7 @@ static void synaptics_parse_ext_buttons(const unsigned char buf[],
> hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
> }
>
> -static int synaptics_parse_hw_state(const unsigned char buf[],
> +static int synaptics_parse_hw_state(const u8 buf[],
> struct synaptics_data *priv,
> struct synaptics_hw_state *hw)
> {
> @@ -834,7 +832,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
> } else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
> hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
> if (hw->w == 2)
> - hw->scroll = (signed char)(buf[1]);
> + hw->scroll = (s8)buf[1];
> }
>
> if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
> @@ -1149,18 +1147,18 @@ static void synaptics_process_packet(struct psmouse *psmouse)
> input_sync(dev);
> }
>
> -static int synaptics_validate_byte(struct psmouse *psmouse,
> - int idx, unsigned char pkt_type)
> +static bool synaptics_validate_byte(struct psmouse *psmouse,
> + int idx, enum synaptics_pkt_type pkt_type)
> {
> - static const unsigned char newabs_mask[] = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
> - static const unsigned char newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
> - static const unsigned char newabs_rslt[] = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
> - static const unsigned char oldabs_mask[] = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
> - static const unsigned char oldabs_rslt[] = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
> - const char *packet = psmouse->packet;
> + static const u8 newabs_mask[] = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
> + static const u8 newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
> + static const u8 newabs_rslt[] = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
> + static const u8 oldabs_mask[] = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
> + static const u8 oldabs_rslt[] = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
> + const u8 *packet = psmouse->packet;
>
> if (idx < 0 || idx > 4)
> - return 0;
> + return false;
>
> switch (pkt_type) {
>
> @@ -1176,19 +1174,21 @@ static int synaptics_validate_byte(struct psmouse *psmouse,
>
> default:
> psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
> - return 0;
> + return false;
> }
> }
>
> -static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
> +static enum synaptics_pkt_type
> +synaptics_detect_pkt_type(struct psmouse *psmouse)
> {
> int i;
>
> - for (i = 0; i < 5; i++)
> + for (i = 0; i < 5; i++) {
> if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
> psmouse_info(psmouse, "using relaxed packet validation\n");
> return SYN_NEWABS_RELAXED;
> }
> + }
>
> return SYN_NEWABS_STRICT;
> }
> @@ -1393,7 +1393,7 @@ static int synaptics_reconnect(struct psmouse *psmouse)
> {
> struct synaptics_data *priv = psmouse->private;
> struct synaptics_device_info info;
> - unsigned char param[2];
> + u8 param[2];
> int retry = 0;
> int error;
>
> diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
> index 7a998fbfa6b0..fc00e005c611 100644
> --- a/drivers/input/mouse/synaptics.h
> +++ b/drivers/input/mouse/synaptics.h
> @@ -137,15 +137,17 @@
> #define SYN_PS_SET_MODE2 0x14
> #define SYN_PS_CLIENT_CMD 0x28
>
> -/* synaptics packet types */
> -#define SYN_NEWABS 0
> -#define SYN_NEWABS_STRICT 1
> -#define SYN_NEWABS_RELAXED 2
> -#define SYN_OLDABS 3
> -
> /* amount to fuzz position data when touchpad reports reduced filtering */
> #define SYN_REDUCED_FILTER_FUZZ 8
>
> +/* synaptics packet types */
> +enum synaptics_pkt_type {
> + SYN_NEWABS,
> + SYN_NEWABS_STRICT,
> + SYN_NEWABS_RELAXED,
> + SYN_OLDABS,
> +};
> +
> /*
> * A structure to describe the state of the touchpad hardware (buttons and pad)
> */
> @@ -159,8 +161,8 @@ struct synaptics_hw_state {
> unsigned int middle:1;
> unsigned int up:1;
> unsigned int down:1;
> - unsigned char ext_buttons;
> - signed char scroll;
> + u8 ext_buttons;
> + s8 scroll;
> };
>
> /* Data read from the touchpad */
> @@ -181,8 +183,8 @@ struct synaptics_device_info {
> struct synaptics_data {
> struct synaptics_device_info info;
>
> - unsigned char pkt_type; /* packet type - old, new, etc */
> - unsigned char mode; /* current mode byte */
> + enum synaptics_pkt_type pkt_type; /* packet type - old, new, etc */
> + u8 mode; /* current mode byte */
> int scroll;
>
> bool absolute_mode; /* run in Absolute mode */
> --
> 2.12.1.578.ge9c3154ca4-goog
>

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