diff options
| -rw-r--r-- | drivers/input/touchscreen/elo.c | 124 |
1 files changed, 107 insertions, 17 deletions
diff --git a/drivers/input/touchscreen/elo.c b/drivers/input/touchscreen/elo.c index fe6e1a42867..ab565335ee4 100644 --- a/drivers/input/touchscreen/elo.c +++ b/drivers/input/touchscreen/elo.c @@ -23,6 +23,7 @@ #include <linux/input.h> #include <linux/serio.h> #include <linux/init.h> +#include <linux/ctype.h> #define DRIVER_DESC "Elo serial touchscreen driver" @@ -36,9 +37,17 @@ MODULE_LICENSE("GPL"); #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. @@ -47,10 +56,14 @@ MODULE_LICENSE("GPL"); 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]; }; @@ -75,16 +88,29 @@ static void elo_process_data_10(struct elo *elo, unsigned char data, struct pt_r data, elo->csum); break; } - if (elo->data[1] != ELO10_TOUCH_PACKET) { - pr_debug(elo: "unexpected packet: 0x%02x\n", elo->data[1]); + 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; } - input_regs(dev, regs); - 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]); - input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]); - input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]); - input_sync(dev); + if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) { + input_regs(dev, regs); + 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; @@ -184,6 +210,68 @@ static irqreturn_t elo_interrupt(struct serio *serio, 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: %x02x, 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() */ @@ -222,6 +310,9 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv) 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->private = elo; @@ -236,12 +327,17 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv) input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); + serio_set_drvdata(serio, elo); + err = serio_open(serio, drv); + if (err) + goto fail2; + switch (elo->id) { case 0: /* 10-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); - input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0); + if (elo_setup_10(elo)) + goto fail3; + break; case 1: /* 6-byte protocol */ @@ -258,12 +354,6 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv) break; } - serio_set_drvdata(serio, elo); - - err = serio_open(serio, drv); - if (err) - goto fail2; - err = input_register_device(elo->dev); if (err) goto fail3; |