diff options
Diffstat (limited to 'drivers/input/touchscreen/elo.c')
| -rw-r--r-- | drivers/input/touchscreen/elo.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/elo.c b/drivers/input/touchscreen/elo.c new file mode 100644 index 0000000..8f38c5e --- /dev/null +++ b/drivers/input/touchscreen/elo.c @@ -0,0 +1,408 @@ +/* + * Elo serial touchscreen driver + * + * Copyright (c) 2004 Vojtech Pavlik + */ + +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +/* + * This driver can handle serial Elo touchscreens using either the Elo standard + * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo + * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol. + */ + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/serio.h> +#include <linux/init.h> +#include <linux/ctype.h> + +#define DRIVER_DESC "Elo serial touchscreen driver" + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +#define ELO_MAX_LENGTH 10 + +#define ELO10_PACKET_LEN 8 +#define ELO10_TOUCH 0x03 +#define ELO10_PRESSURE 0x80 + +#define ELO10_LEAD_BYTE 'U' + +#define ELO10_ID_CMD 'i' + +#define ELO10_TOUCH_PACKET 'T' +#define ELO10_ACK_PACKET 'A' +#define ELI10_ID_PACKET 'I' + +/* + * Per-touchscreen data. + */ + +struct elo { + struct input_dev *dev; + struct serio *serio; + struct mutex cmd_mutex; + struct completion cmd_done; + int id; + int idx; + unsigned char expected_packet; + unsigned char csum; + unsigned char data[ELO_MAX_LENGTH]; + unsigned char response[ELO10_PACKET_LEN]; + char phys[32]; +}; + +static void elo_process_data_10(struct elo *elo, unsigned char data) +{ + struct input_dev *dev = elo->dev; + + elo->data[elo->idx] = data; + switch (elo->idx++) { + case 0: + elo->csum = 0xaa; + if (data != ELO10_LEAD_BYTE) { + pr_debug("elo: unsynchronized data: 0x%02x\n", data); + elo->idx = 0; + } + break; + + case 9: + elo->idx = 0; + if (data != elo->csum) { + pr_debug("elo: bad checksum: 0x%02x, expected 0x%02x\n", + data, elo->csum); + break; + } + if (elo->data[1] != elo->expected_packet) { + if (elo->data[1] != ELO10_TOUCH_PACKET) + pr_debug("elo: unexpected packet: 0x%02x\n", + elo->data[1]); + break; + } + if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) { + input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]); + input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]); + if (elo->data[2] & ELO10_PRESSURE) + input_report_abs(dev, ABS_PRESSURE, + (elo->data[8] << 8) | elo->data[7]); + input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH); + input_sync(dev); + } else if (elo->data[1] == ELO10_ACK_PACKET) { + if (elo->data[2] == '0') + elo->expected_packet = ELO10_TOUCH_PACKET; + complete(&elo->cmd_done); + } else { + memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN); + elo->expected_packet = ELO10_ACK_PACKET; + } + break; + } + elo->csum += data; +} + +static void elo_process_data_6(struct elo *elo, unsigned char data) +{ + struct input_dev *dev = elo->dev; + + elo->data[elo->idx] = data; + + switch (elo->idx++) { + + case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break; + case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break; + case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break; + + case 3: + if (data & 0xc0) { + elo->idx = 0; + break; + } + + input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f)); + input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f)); + + if (elo->id == 2) { + input_report_key(dev, BTN_TOUCH, 1); + input_sync(dev); + elo->idx = 0; + } + + break; + + case 4: + if (data) { + input_sync(dev); + elo->idx = 0; + } + break; + + case 5: + if ((data & 0xf0) == 0) { + input_report_abs(dev, ABS_PRESSURE, elo->data[5]); + input_report_key(dev, BTN_TOUCH, !!elo->data[5]); + } + input_sync(dev); + elo->idx = 0; + break; + } +} + +static void elo_process_data_3(struct elo *elo, unsigned char data) +{ + struct input_dev *dev = elo->dev; + + elo->data[elo->idx] = data; + + switch (elo->idx++) { + + case 0: + if ((data & 0x7f) != 0x01) + elo->idx = 0; + break; + case 2: + input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80)); + input_report_abs(dev, ABS_X, elo->data[1]); + input_report_abs(dev, ABS_Y, elo->data[2]); + input_sync(dev); + elo->idx = 0; + break; + } +} + +static irqreturn_t elo_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct elo *elo = serio_get_drvdata(serio); + + switch(elo->id) { + case 0: + elo_process_data_10(elo, data); + break; + + case 1: + case 2: + elo_process_data_6(elo, data); + break; + + case 3: + elo_process_data_3(elo, data); + break; + } + + return IRQ_HANDLED; +} + +static int elo_command_10(struct elo *elo, unsigned char *packet) +{ + int rc = -1; + int i; + unsigned char csum = 0xaa + ELO10_LEAD_BYTE; + + mutex_lock(&elo->cmd_mutex); + + serio_pause_rx(elo->serio); + elo->expected_packet = toupper(packet[0]); + init_completion(&elo->cmd_done); + serio_continue_rx(elo->serio); + + if (serio_write(elo->serio, ELO10_LEAD_BYTE)) + goto out; + + for (i = 0; i < ELO10_PACKET_LEN; i++) { + csum += packet[i]; + if (serio_write(elo->serio, packet[i])) + goto out; + } + + if (serio_write(elo->serio, csum)) + goto out; + + wait_for_completion_timeout(&elo->cmd_done, HZ); + + if (elo->expected_packet == ELO10_TOUCH_PACKET) { + /* We are back in reporting mode, the command was ACKed */ + memcpy(packet, elo->response, ELO10_PACKET_LEN); + rc = 0; + } + + out: + mutex_unlock(&elo->cmd_mutex); + return rc; +} + +static int elo_setup_10(struct elo *elo) +{ + static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" }; + struct input_dev *dev = elo->dev; + unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD }; + + if (elo_command_10(elo, packet)) + return -1; + + dev->id.version = (packet[5] << 8) | packet[4]; + + input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0); + input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0); + if (packet[3] & ELO10_PRESSURE) + input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0); + + printk(KERN_INFO "elo: %sTouch touchscreen, fw: %02x.%02x, " + "features: 0x%02x, controller: 0x%02x\n", + elo_types[(packet[1] -'0') & 0x03], + packet[5], packet[4], packet[3], packet[7]); + + return 0; +} + +/* + * elo_disconnect() is the opposite of elo_connect() + */ + +static void elo_disconnect(struct serio *serio) +{ + struct elo *elo = serio_get_drvdata(serio); + + input_get_device(elo->dev); + input_unregister_device(elo->dev); + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_put_device(elo->dev); + kfree(elo); +} + +/* + * elo_connect() is the routine that is called when someone adds a + * new serio device that supports Gunze protocol and registers it as + * an input device. + */ + +static int elo_connect(struct serio *serio, struct serio_driver *drv) +{ + struct elo *elo; + struct input_dev *input_dev; + int err; + + elo = kzalloc(sizeof(struct elo), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!elo || !input_dev) { + err = -ENOMEM; + goto fail1; + } + + elo->serio = serio; + elo->id = serio->id.id; + elo->dev = input_dev; + elo->expected_packet = ELO10_TOUCH_PACKET; + mutex_init(&elo->cmd_mutex); + init_completion(&elo->cmd_done); + snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys); + + input_dev->name = "Elo Serial TouchScreen"; + input_dev->phys = elo->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_ELO; + input_dev->id.product = elo->id; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &serio->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + + serio_set_drvdata(serio, elo); + err = serio_open(serio, drv); + if (err) + goto fail2; + + switch (elo->id) { + + case 0: /* 10-byte protocol */ + if (elo_setup_10(elo)) + goto fail3; + + break; + + case 1: /* 6-byte protocol */ + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0); + + case 2: /* 4-byte protocol */ + input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0); + break; + + case 3: /* 3-byte protocol */ + input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0); + break; + } + + err = input_register_device(elo->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(elo); + return err; +} + +/* + * The serio driver structure. + */ + +static struct serio_device_id elo_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_ELO, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, elo_serio_ids); + +static struct serio_driver elo_drv = { + .driver = { + .name = "elo", + }, + .description = DRIVER_DESC, + .id_table = elo_serio_ids, + .interrupt = elo_interrupt, + .connect = elo_connect, + .disconnect = elo_disconnect, +}; + +/* + * The functions for inserting/removing us as a module. + */ + +static int __init elo_init(void) +{ + return serio_register_driver(&elo_drv); +} + +static void __exit elo_exit(void) +{ + serio_unregister_driver(&elo_drv); +} + +module_init(elo_init); +module_exit(elo_exit); |
