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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/mouse/cypress_ps2.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/mouse/cypress_ps2.c')
-rw-r--r--drivers/input/mouse/cypress_ps2.c707
1 files changed, 707 insertions, 0 deletions
diff --git a/drivers/input/mouse/cypress_ps2.c b/drivers/input/mouse/cypress_ps2.c
new file mode 100644
index 000000000..d272f1ec2
--- /dev/null
+++ b/drivers/input/mouse/cypress_ps2.c
@@ -0,0 +1,707 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Cypress Trackpad PS/2 mouse driver
+ *
+ * Copyright (c) 2012 Cypress Semiconductor Corporation.
+ *
+ * Author:
+ * Dudley Du <dudl@cypress.com>
+ *
+ * Additional contributors include:
+ * Kamal Mostafa <kamal@canonical.com>
+ * Kyle Fazzari <git@status.e4ward.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#include "cypress_ps2.h"
+
+#undef CYTP_DEBUG_VERBOSE /* define this and DEBUG for more verbose dump */
+
+static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
+{
+ struct cytp_data *cytp = psmouse->private;
+ cytp->pkt_size = n;
+}
+
+static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
+static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
+
+static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
+{
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+ if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
+ psmouse_dbg(psmouse,
+ "sending command 0x%02x failed, resp 0x%02x\n",
+ value & 0xff, ps2dev->nak);
+ if (ps2dev->nak == CYTP_PS2_RETRY)
+ return CYTP_PS2_RETRY;
+ else
+ return CYTP_PS2_ERROR;
+ }
+
+#ifdef CYTP_DEBUG_VERBOSE
+ psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
+ value & 0xff);
+#endif
+
+ return 0;
+}
+
+static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
+ unsigned char data)
+{
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+ int tries = CYTP_PS2_CMD_TRIES;
+ int rc;
+
+ ps2_begin_command(ps2dev);
+
+ do {
+ /*
+ * Send extension command byte (0xE8 or 0xF3).
+ * If sending the command fails, send recovery command
+ * to make the device return to the ready state.
+ */
+ rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
+ if (rc == CYTP_PS2_RETRY) {
+ rc = cypress_ps2_sendbyte(psmouse, 0x00);
+ if (rc == CYTP_PS2_RETRY)
+ rc = cypress_ps2_sendbyte(psmouse, 0x0a);
+ }
+ if (rc == CYTP_PS2_ERROR)
+ continue;
+
+ rc = cypress_ps2_sendbyte(psmouse, data);
+ if (rc == CYTP_PS2_RETRY)
+ rc = cypress_ps2_sendbyte(psmouse, data);
+ if (rc == CYTP_PS2_ERROR)
+ continue;
+ else
+ break;
+ } while (--tries > 0);
+
+ ps2_end_command(ps2dev);
+
+ return rc;
+}
+
+static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
+ unsigned char cmd,
+ unsigned char *param)
+{
+ int rc;
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+ enum psmouse_state old_state;
+ int pktsize;
+
+ ps2_begin_command(ps2dev);
+
+ old_state = psmouse->state;
+ psmouse->state = PSMOUSE_CMD_MODE;
+ psmouse->pktcnt = 0;
+
+ pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
+ memset(param, 0, pktsize);
+
+ rc = cypress_ps2_sendbyte(psmouse, 0xe9);
+ if (rc < 0)
+ goto out;
+
+ wait_event_timeout(ps2dev->wait,
+ (psmouse->pktcnt >= pktsize),
+ msecs_to_jiffies(CYTP_CMD_TIMEOUT));
+
+ memcpy(param, psmouse->packet, pktsize);
+
+ psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
+ cmd, pktsize, param);
+
+out:
+ psmouse->state = old_state;
+ psmouse->pktcnt = 0;
+
+ ps2_end_command(ps2dev);
+
+ return rc;
+}
+
+static bool cypress_verify_cmd_state(struct psmouse *psmouse,
+ unsigned char cmd, unsigned char *param)
+{
+ bool rate_match = false;
+ bool resolution_match = false;
+ int i;
+
+ /* callers will do further checking. */
+ if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
+ cmd == CYTP_CMD_STANDARD_MODE ||
+ cmd == CYTP_CMD_READ_TP_METRICS)
+ return true;
+
+ if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
+ (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
+ for (i = 0; i < sizeof(cytp_resolution); i++)
+ if (cytp_resolution[i] == param[1])
+ resolution_match = true;
+
+ for (i = 0; i < sizeof(cytp_rate); i++)
+ if (cytp_rate[i] == param[2])
+ rate_match = true;
+
+ if (resolution_match && rate_match)
+ return true;
+ }
+
+ psmouse_dbg(psmouse, "verify cmd state failed.\n");
+ return false;
+}
+
+static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
+ unsigned char *param)
+{
+ int tries = CYTP_PS2_CMD_TRIES;
+ int rc;
+
+ psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
+ cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
+ DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
+
+ do {
+ cypress_ps2_ext_cmd(psmouse,
+ PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
+ cypress_ps2_ext_cmd(psmouse,
+ PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
+ cypress_ps2_ext_cmd(psmouse,
+ PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
+ cypress_ps2_ext_cmd(psmouse,
+ PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
+
+ rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
+ if (rc)
+ continue;
+
+ if (cypress_verify_cmd_state(psmouse, cmd, param))
+ return 0;
+
+ } while (--tries > 0);
+
+ return -EIO;
+}
+
+int cypress_detect(struct psmouse *psmouse, bool set_properties)
+{
+ unsigned char param[3];
+
+ if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
+ return -ENODEV;
+
+ /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
+ if (param[0] != 0x33 || param[1] != 0xCC)
+ return -ENODEV;
+
+ if (set_properties) {
+ psmouse->vendor = "Cypress";
+ psmouse->name = "Trackpad";
+ }
+
+ return 0;
+}
+
+static int cypress_read_fw_version(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp = psmouse->private;
+ unsigned char param[3];
+
+ if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
+ return -ENODEV;
+
+ /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
+ if (param[0] != 0x33 || param[1] != 0xCC)
+ return -ENODEV;
+
+ cytp->fw_version = param[2] & FW_VERSION_MASX;
+ cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
+
+ /*
+ * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
+ * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
+ */
+ if (cytp->fw_version >= 11)
+ cytp->tp_metrics_supported = 0;
+
+ psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
+ psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
+ cytp->tp_metrics_supported);
+
+ return 0;
+}
+
+static int cypress_read_tp_metrics(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp = psmouse->private;
+ unsigned char param[8];
+
+ /* set default values for tp metrics. */
+ cytp->tp_width = CYTP_DEFAULT_WIDTH;
+ cytp->tp_high = CYTP_DEFAULT_HIGH;
+ cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
+ cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
+ cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
+ cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
+ cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
+ cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
+
+ if (!cytp->tp_metrics_supported)
+ return 0;
+
+ memset(param, 0, sizeof(param));
+ if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
+ /* Update trackpad parameters. */
+ cytp->tp_max_abs_x = (param[1] << 8) | param[0];
+ cytp->tp_max_abs_y = (param[3] << 8) | param[2];
+ cytp->tp_min_pressure = param[4];
+ cytp->tp_max_pressure = param[5];
+ }
+
+ if (!cytp->tp_max_pressure ||
+ cytp->tp_max_pressure < cytp->tp_min_pressure ||
+ !cytp->tp_width || !cytp->tp_high ||
+ !cytp->tp_max_abs_x ||
+ cytp->tp_max_abs_x < cytp->tp_width ||
+ !cytp->tp_max_abs_y ||
+ cytp->tp_max_abs_y < cytp->tp_high)
+ return -EINVAL;
+
+ cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
+ cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
+
+#ifdef CYTP_DEBUG_VERBOSE
+ psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
+ psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
+ psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
+ psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
+ psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
+ psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
+ psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
+ psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
+ psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
+
+ psmouse_dbg(psmouse, "tp_type_APA = %d\n",
+ (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
+ psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
+ (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
+ psmouse_dbg(psmouse, "tp_palm = %d\n",
+ (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
+ psmouse_dbg(psmouse, "tp_stubborn = %d\n",
+ (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
+ psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
+ (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
+ psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
+ (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
+ psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
+ param[7] & TP_METRICS_BIT_1F_SPIKE);
+ psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
+ (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
+ psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
+ (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
+#endif
+
+ return 0;
+}
+
+static int cypress_query_hardware(struct psmouse *psmouse)
+{
+ int ret;
+
+ ret = cypress_read_fw_version(psmouse);
+ if (ret)
+ return ret;
+
+ ret = cypress_read_tp_metrics(psmouse);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int cypress_set_absolute_mode(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp = psmouse->private;
+ unsigned char param[3];
+
+ if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
+ return -1;
+
+ cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
+ | CYTP_BIT_ABS_PRESSURE;
+ cypress_set_packet_size(psmouse, 5);
+
+ return 0;
+}
+
+/*
+ * Reset trackpad device.
+ * This is also the default mode when trackpad powered on.
+ */
+static void cypress_reset(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp = psmouse->private;
+
+ cytp->mode = 0;
+
+ psmouse_reset(psmouse);
+}
+
+static int cypress_set_input_params(struct input_dev *input,
+ struct cytp_data *cytp)
+{
+ int ret;
+
+ if (!cytp->tp_res_x || !cytp->tp_res_y)
+ return -EINVAL;
+
+ __set_bit(EV_ABS, input->evbit);
+ input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
+ input_set_abs_params(input, ABS_PRESSURE,
+ cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
+ input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
+
+ /* finger position */
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+
+ ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
+ INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
+ if (ret < 0)
+ return ret;
+
+ __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
+
+ input_abs_set_res(input, ABS_X, cytp->tp_res_x);
+ input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
+
+ input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
+ input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
+
+ __set_bit(BTN_TOUCH, input->keybit);
+ __set_bit(BTN_TOOL_FINGER, input->keybit);
+ __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
+ __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
+ __set_bit(BTN_TOOL_QUADTAP, input->keybit);
+ __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
+
+ __clear_bit(EV_REL, input->evbit);
+ __clear_bit(REL_X, input->relbit);
+ __clear_bit(REL_Y, input->relbit);
+
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(BTN_LEFT, input->keybit);
+ __set_bit(BTN_RIGHT, input->keybit);
+ __set_bit(BTN_MIDDLE, input->keybit);
+
+ return 0;
+}
+
+static int cypress_get_finger_count(unsigned char header_byte)
+{
+ unsigned char bits6_7;
+ int finger_count;
+
+ bits6_7 = header_byte >> 6;
+ finger_count = bits6_7 & 0x03;
+
+ if (finger_count == 1)
+ return 1;
+
+ if (header_byte & ABS_HSCROLL_BIT) {
+ /* HSCROLL gets added on to 0 finger count. */
+ switch (finger_count) {
+ case 0: return 4;
+ case 2: return 5;
+ default:
+ /* Invalid contact (e.g. palm). Ignore it. */
+ return 0;
+ }
+ }
+
+ return finger_count;
+}
+
+
+static int cypress_parse_packet(struct psmouse *psmouse,
+ struct cytp_data *cytp, struct cytp_report_data *report_data)
+{
+ unsigned char *packet = psmouse->packet;
+ unsigned char header_byte = packet[0];
+
+ memset(report_data, 0, sizeof(struct cytp_report_data));
+
+ report_data->contact_cnt = cypress_get_finger_count(header_byte);
+ report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
+
+ if (report_data->contact_cnt == 1) {
+ report_data->contacts[0].x =
+ ((packet[1] & 0x70) << 4) | packet[2];
+ report_data->contacts[0].y =
+ ((packet[1] & 0x07) << 8) | packet[3];
+ if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+ report_data->contacts[0].z = packet[4];
+
+ } else if (report_data->contact_cnt >= 2) {
+ report_data->contacts[0].x =
+ ((packet[1] & 0x70) << 4) | packet[2];
+ report_data->contacts[0].y =
+ ((packet[1] & 0x07) << 8) | packet[3];
+ if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+ report_data->contacts[0].z = packet[4];
+
+ report_data->contacts[1].x =
+ ((packet[5] & 0xf0) << 4) | packet[6];
+ report_data->contacts[1].y =
+ ((packet[5] & 0x0f) << 8) | packet[7];
+ if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+ report_data->contacts[1].z = report_data->contacts[0].z;
+ }
+
+ report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
+ report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
+
+ /*
+ * This is only true if one of the mouse buttons were tapped. Make
+ * sure it doesn't turn into a click. The regular tap-to-click
+ * functionality will handle that on its own. If we don't do this,
+ * disabling tap-to-click won't affect the mouse button zones.
+ */
+ if (report_data->tap)
+ report_data->left = 0;
+
+#ifdef CYTP_DEBUG_VERBOSE
+ {
+ int i;
+ int n = report_data->contact_cnt;
+ psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
+ psmouse_dbg(psmouse, "contact_cnt = %d\n",
+ report_data->contact_cnt);
+ if (n > CYTP_MAX_MT_SLOTS)
+ n = CYTP_MAX_MT_SLOTS;
+ for (i = 0; i < n; i++)
+ psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
+ report_data->contacts[i].x,
+ report_data->contacts[i].y,
+ report_data->contacts[i].z);
+ psmouse_dbg(psmouse, "left = %d\n", report_data->left);
+ psmouse_dbg(psmouse, "right = %d\n", report_data->right);
+ psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
+ }
+#endif
+
+ return 0;
+}
+
+static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
+{
+ int i;
+ struct input_dev *input = psmouse->dev;
+ struct cytp_data *cytp = psmouse->private;
+ struct cytp_report_data report_data;
+ struct cytp_contact *contact;
+ struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
+ int slots[CYTP_MAX_MT_SLOTS];
+ int n;
+
+ cypress_parse_packet(psmouse, cytp, &report_data);
+
+ n = report_data.contact_cnt;
+ if (n > CYTP_MAX_MT_SLOTS)
+ n = CYTP_MAX_MT_SLOTS;
+
+ for (i = 0; i < n; i++) {
+ contact = &report_data.contacts[i];
+ pos[i].x = contact->x;
+ pos[i].y = contact->y;
+ }
+
+ input_mt_assign_slots(input, slots, pos, n, 0);
+
+ for (i = 0; i < n; i++) {
+ contact = &report_data.contacts[i];
+ input_mt_slot(input, slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, contact->x);
+ input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
+ input_report_abs(input, ABS_MT_PRESSURE, contact->z);
+ }
+
+ input_mt_sync_frame(input);
+
+ input_mt_report_finger_count(input, report_data.contact_cnt);
+
+ input_report_key(input, BTN_LEFT, report_data.left);
+ input_report_key(input, BTN_RIGHT, report_data.right);
+ input_report_key(input, BTN_MIDDLE, report_data.middle);
+
+ input_sync(input);
+}
+
+static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
+{
+ int contact_cnt;
+ int index = psmouse->pktcnt - 1;
+ unsigned char *packet = psmouse->packet;
+ struct cytp_data *cytp = psmouse->private;
+
+ if (index < 0 || index > cytp->pkt_size)
+ return PSMOUSE_BAD_DATA;
+
+ if (index == 0 && (packet[0] & 0xfc) == 0) {
+ /* call packet process for reporting finger leave. */
+ cypress_process_packet(psmouse, 1);
+ return PSMOUSE_FULL_PACKET;
+ }
+
+ /*
+ * Perform validation (and adjust packet size) based only on the
+ * first byte; allow all further bytes through.
+ */
+ if (index != 0)
+ return PSMOUSE_GOOD_DATA;
+
+ /*
+ * If absolute/relative mode bit has not been set yet, just pass
+ * the byte through.
+ */
+ if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
+ return PSMOUSE_GOOD_DATA;
+
+ if ((packet[0] & 0x08) == 0x08)
+ return PSMOUSE_BAD_DATA;
+
+ contact_cnt = cypress_get_finger_count(packet[0]);
+ if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
+ cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
+ else
+ cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
+
+ return PSMOUSE_GOOD_DATA;
+}
+
+static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp = psmouse->private;
+
+ if (psmouse->pktcnt >= cytp->pkt_size) {
+ cypress_process_packet(psmouse, 0);
+ return PSMOUSE_FULL_PACKET;
+ }
+
+ return cypress_validate_byte(psmouse);
+}
+
+static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
+{
+ struct cytp_data *cytp = psmouse->private;
+
+ if (rate >= 80) {
+ psmouse->rate = 80;
+ cytp->mode |= CYTP_BIT_HIGH_RATE;
+ } else {
+ psmouse->rate = 40;
+ cytp->mode &= ~CYTP_BIT_HIGH_RATE;
+ }
+
+ ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
+ PSMOUSE_CMD_SETRATE);
+}
+
+static void cypress_disconnect(struct psmouse *psmouse)
+{
+ cypress_reset(psmouse);
+ kfree(psmouse->private);
+ psmouse->private = NULL;
+}
+
+static int cypress_reconnect(struct psmouse *psmouse)
+{
+ int tries = CYTP_PS2_CMD_TRIES;
+ int rc;
+
+ do {
+ cypress_reset(psmouse);
+ rc = cypress_detect(psmouse, false);
+ } while (rc && (--tries > 0));
+
+ if (rc) {
+ psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
+ return -1;
+ }
+
+ if (cypress_set_absolute_mode(psmouse)) {
+ psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+int cypress_init(struct psmouse *psmouse)
+{
+ struct cytp_data *cytp;
+
+ cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
+ if (!cytp)
+ return -ENOMEM;
+
+ psmouse->private = cytp;
+ psmouse->pktsize = 8;
+
+ cypress_reset(psmouse);
+
+ if (cypress_query_hardware(psmouse)) {
+ psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
+ goto err_exit;
+ }
+
+ if (cypress_set_absolute_mode(psmouse)) {
+ psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
+ goto err_exit;
+ }
+
+ if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
+ psmouse_err(psmouse, "init: Unable to set input params.\n");
+ goto err_exit;
+ }
+
+ psmouse->model = 1;
+ psmouse->protocol_handler = cypress_protocol_handler;
+ psmouse->set_rate = cypress_set_rate;
+ psmouse->disconnect = cypress_disconnect;
+ psmouse->reconnect = cypress_reconnect;
+ psmouse->cleanup = cypress_reset;
+ psmouse->resync_time = 0;
+
+ return 0;
+
+err_exit:
+ /*
+ * Reset Cypress Trackpad as a standard mouse. Then
+ * let psmouse driver communicating with it as default PS2 mouse.
+ */
+ cypress_reset(psmouse);
+
+ psmouse->private = NULL;
+ kfree(cytp);
+
+ return -1;
+}