diff options
Diffstat (limited to 'drivers/input/joystick/iforce/iforce-serio.c')
| -rw-r--r-- | drivers/input/joystick/iforce/iforce-serio.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/input/joystick/iforce/iforce-serio.c b/drivers/input/joystick/iforce/iforce-serio.c new file mode 100644 index 000000000..2380546d7 --- /dev/null +++ b/drivers/input/joystick/iforce/iforce-serio.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz> + * Copyright (c) 2001, 2007 Johann Deneux <johann.deneux@gmail.com> + * + * USB/RS232 I-Force joysticks and wheels. + */ + +#include <linux/serio.h> +#include "iforce.h" + +struct iforce_serio { + struct iforce iforce; + + struct serio *serio; + int idx, pkt, len, id; + u8 csum; + u8 expect_packet; + u8 cmd_response[IFORCE_MAX_LENGTH]; + u8 cmd_response_len; + u8 data_in[IFORCE_MAX_LENGTH]; +}; + +static void iforce_serio_xmit(struct iforce *iforce) +{ + struct iforce_serio *iforce_serio = container_of(iforce, + struct iforce_serio, + iforce); + unsigned char cs; + int i; + unsigned long flags; + + if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) { + set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags); + return; + } + + spin_lock_irqsave(&iforce->xmit_lock, flags); + +again: + if (iforce->xmit.head == iforce->xmit.tail) { + iforce_clear_xmit_and_wake(iforce); + spin_unlock_irqrestore(&iforce->xmit_lock, flags); + return; + } + + cs = 0x2b; + + serio_write(iforce_serio->serio, 0x2b); + + serio_write(iforce_serio->serio, iforce->xmit.buf[iforce->xmit.tail]); + cs ^= iforce->xmit.buf[iforce->xmit.tail]; + XMIT_INC(iforce->xmit.tail, 1); + + for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) { + serio_write(iforce_serio->serio, + iforce->xmit.buf[iforce->xmit.tail]); + cs ^= iforce->xmit.buf[iforce->xmit.tail]; + XMIT_INC(iforce->xmit.tail, 1); + } + + serio_write(iforce_serio->serio, cs); + + if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags)) + goto again; + + iforce_clear_xmit_and_wake(iforce); + + spin_unlock_irqrestore(&iforce->xmit_lock, flags); +} + +static int iforce_serio_get_id(struct iforce *iforce, u8 id, + u8 *response_data, size_t *response_len) +{ + struct iforce_serio *iforce_serio = container_of(iforce, + struct iforce_serio, + iforce); + + iforce_serio->expect_packet = HI(FF_CMD_QUERY); + iforce_serio->cmd_response_len = 0; + + iforce_send_packet(iforce, FF_CMD_QUERY, &id); + + wait_event_interruptible_timeout(iforce->wait, + !iforce_serio->expect_packet, HZ); + + if (iforce_serio->expect_packet) { + iforce_serio->expect_packet = 0; + return -ETIMEDOUT; + } + + if (iforce_serio->cmd_response[0] != id) + return -EIO; + + memcpy(response_data, iforce_serio->cmd_response, + iforce_serio->cmd_response_len); + *response_len = iforce_serio->cmd_response_len; + + return 0; +} + +static int iforce_serio_start_io(struct iforce *iforce) +{ + /* No special handling required */ + return 0; +} + +static void iforce_serio_stop_io(struct iforce *iforce) +{ + //TODO: Wait for the last packets to be sent +} + +static const struct iforce_xport_ops iforce_serio_xport_ops = { + .xmit = iforce_serio_xmit, + .get_id = iforce_serio_get_id, + .start_io = iforce_serio_start_io, + .stop_io = iforce_serio_stop_io, +}; + +static void iforce_serio_write_wakeup(struct serio *serio) +{ + struct iforce *iforce = serio_get_drvdata(serio); + + iforce_serio_xmit(iforce); +} + +static irqreturn_t iforce_serio_irq(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct iforce_serio *iforce_serio = serio_get_drvdata(serio); + struct iforce *iforce = &iforce_serio->iforce; + + if (!iforce_serio->pkt) { + if (data == 0x2b) + iforce_serio->pkt = 1; + goto out; + } + + if (!iforce_serio->id) { + if (data > 3 && data != 0xff) + iforce_serio->pkt = 0; + else + iforce_serio->id = data; + goto out; + } + + if (!iforce_serio->len) { + if (data > IFORCE_MAX_LENGTH) { + iforce_serio->pkt = 0; + iforce_serio->id = 0; + } else { + iforce_serio->len = data; + } + goto out; + } + + if (iforce_serio->idx < iforce_serio->len) { + iforce_serio->data_in[iforce_serio->idx++] = data; + iforce_serio->csum += data; + goto out; + } + + if (iforce_serio->idx == iforce_serio->len) { + /* Handle command completion */ + if (iforce_serio->expect_packet == iforce_serio->id) { + iforce_serio->expect_packet = 0; + memcpy(iforce_serio->cmd_response, + iforce_serio->data_in, IFORCE_MAX_LENGTH); + iforce_serio->cmd_response_len = iforce_serio->len; + + /* Signal that command is done */ + wake_up_all(&iforce->wait); + } else if (likely(iforce->type)) { + iforce_process_packet(iforce, iforce_serio->id, + iforce_serio->data_in, + iforce_serio->len); + } + + iforce_serio->pkt = 0; + iforce_serio->id = 0; + iforce_serio->len = 0; + iforce_serio->idx = 0; + iforce_serio->csum = 0; + } +out: + return IRQ_HANDLED; +} + +static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv) +{ + struct iforce_serio *iforce_serio; + int err; + + iforce_serio = kzalloc(sizeof(*iforce_serio), GFP_KERNEL); + if (!iforce_serio) + return -ENOMEM; + + iforce_serio->iforce.xport_ops = &iforce_serio_xport_ops; + + iforce_serio->serio = serio; + serio_set_drvdata(serio, iforce_serio); + + err = serio_open(serio, drv); + if (err) + goto fail1; + + err = iforce_init_device(&serio->dev, BUS_RS232, &iforce_serio->iforce); + if (err) + goto fail2; + + return 0; + + fail2: serio_close(serio); + fail1: serio_set_drvdata(serio, NULL); + kfree(iforce_serio); + return err; +} + +static void iforce_serio_disconnect(struct serio *serio) +{ + struct iforce_serio *iforce_serio = serio_get_drvdata(serio); + + input_unregister_device(iforce_serio->iforce.dev); + serio_close(serio); + serio_set_drvdata(serio, NULL); + kfree(iforce_serio); +} + +static const struct serio_device_id iforce_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_IFORCE, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, iforce_serio_ids); + +struct serio_driver iforce_serio_drv = { + .driver = { + .name = "iforce", + }, + .description = "RS232 I-Force joysticks and wheels driver", + .id_table = iforce_serio_ids, + .write_wakeup = iforce_serio_write_wakeup, + .interrupt = iforce_serio_irq, + .connect = iforce_serio_connect, + .disconnect = iforce_serio_disconnect, +}; + +module_serio_driver(iforce_serio_drv); + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <johann.deneux@gmail.com>"); +MODULE_DESCRIPTION("RS232 I-Force joysticks and wheels driver"); +MODULE_LICENSE("GPL"); |