diff options
Diffstat (limited to 'drivers/hid/hid-lgff.c')
| -rw-r--r-- | drivers/hid/hid-lgff.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/hid/hid-lgff.c b/drivers/hid/hid-lgff.c new file mode 100644 index 000000000..aed4ddc39 --- /dev/null +++ b/drivers/hid/hid-lgff.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Force feedback support for hid-compliant for some of the devices from + * Logitech, namely: + * - WingMan Cordless RumblePad + * - WingMan Force 3D + * + * Copyright (c) 2002-2004 Johann Deneux + * Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com> + */ + +/* + * + * Should you need to contact me, the author, you can do so by + * e-mail - mail your message to <johann.deneux@it.uu.se> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/input.h> +#include <linux/hid.h> + +#include "hid-lg.h" + +struct dev_type { + u16 idVendor; + u16 idProduct; + const signed short *ff; +}; + +static const signed short ff_rumble[] = { + FF_RUMBLE, + -1 +}; + +static const signed short ff_joystick[] = { + FF_CONSTANT, + -1 +}; + +static const signed short ff_joystick_ac[] = { + FF_CONSTANT, + FF_AUTOCENTER, + -1 +}; + +static const struct dev_type devices[] = { + { 0x046d, 0xc211, ff_rumble }, + { 0x046d, 0xc219, ff_rumble }, + { 0x046d, 0xc283, ff_joystick }, + { 0x046d, 0xc286, ff_joystick_ac }, + { 0x046d, 0xc287, ff_joystick_ac }, + { 0x046d, 0xc293, ff_joystick }, + { 0x046d, 0xc295, ff_joystick }, +}; + +static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect) +{ + struct hid_device *hid = input_get_drvdata(dev); + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct hid_report *report = list_entry(report_list->next, struct hid_report, list); + int x, y; + unsigned int left, right; + +#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff + + switch (effect->type) { + case FF_CONSTANT: + x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */ + y = effect->u.ramp.end_level + 0x7f; + CLAMP(x); + CLAMP(y); + report->field[0]->value[0] = 0x51; + report->field[0]->value[1] = 0x08; + report->field[0]->value[2] = x; + report->field[0]->value[3] = y; + dbg_hid("(x, y)=(%04x, %04x)\n", x, y); + hid_hw_request(hid, report, HID_REQ_SET_REPORT); + break; + + case FF_RUMBLE: + right = effect->u.rumble.strong_magnitude; + left = effect->u.rumble.weak_magnitude; + right = right * 0xff / 0xffff; + left = left * 0xff / 0xffff; + CLAMP(left); + CLAMP(right); + report->field[0]->value[0] = 0x42; + report->field[0]->value[1] = 0x00; + report->field[0]->value[2] = left; + report->field[0]->value[3] = right; + dbg_hid("(left, right)=(%04x, %04x)\n", left, right); + hid_hw_request(hid, report, HID_REQ_SET_REPORT); + break; + } + return 0; +} + +static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude) +{ + struct hid_device *hid = input_get_drvdata(dev); + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct hid_report *report = list_entry(report_list->next, struct hid_report, list); + __s32 *value = report->field[0]->value; + magnitude = (magnitude >> 12) & 0xf; + *value++ = 0xfe; + *value++ = 0x0d; + *value++ = magnitude; /* clockwise strength */ + *value++ = magnitude; /* counter-clockwise strength */ + *value++ = 0x80; + *value++ = 0x00; + *value = 0x00; + hid_hw_request(hid, report, HID_REQ_SET_REPORT); +} + +int lgff_init(struct hid_device* hid) +{ + struct hid_input *hidinput; + struct input_dev *dev; + const signed short *ff_bits = ff_joystick; + int error; + int i; + + if (list_empty(&hid->inputs)) { + hid_err(hid, "no inputs found\n"); + return -ENODEV; + } + hidinput = list_entry(hid->inputs.next, struct hid_input, list); + dev = hidinput->input; + + /* Check that the report looks ok */ + if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7)) + return -ENODEV; + + for (i = 0; i < ARRAY_SIZE(devices); i++) { + if (dev->id.vendor == devices[i].idVendor && + dev->id.product == devices[i].idProduct) { + ff_bits = devices[i].ff; + break; + } + } + + for (i = 0; ff_bits[i] >= 0; i++) + set_bit(ff_bits[i], dev->ffbit); + + error = input_ff_create_memless(dev, NULL, hid_lgff_play); + if (error) + return error; + + if ( test_bit(FF_AUTOCENTER, dev->ffbit) ) + dev->ff->set_autocenter = hid_lgff_set_autocenter; + + pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n"); + + return 0; +} |