patch-2.4.21 linux-2.4.21/drivers/usb/powermate.c

• Lines: 364
• Date: 2003-06-13 07:51:36.000000000 -0700
• Orig file: linux-2.4.20/drivers/usb/powermate.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/usb/powermate.c linux-2.4.21/drivers/usb/powermate.c
@@ -0,0 +1,363 @@
+/*
+ * A driver for the Griffin Technology, Inc. "PowerMate" USB controller dial.
+ *
+ * v1.0, (c)2002 William R Sowerbutts <will@sowerbutts.com>
+ *
+ * This device is a stainless steel knob which connects over USB. It can measure
+ * clockwise and anticlockwise rotation. The dial also acts as a pushbutton with
+ * a spring for automatic release. The base contains a pair of LEDs which illuminate
+ * the translucent base. It rotates without limit and reports its relative rotation
+ * back to the host when polled by the USB controller.
+ *
+ * Testing with the knob I have has shown that it measures approximately 96 "clicks"
+ * for one full rotation. Testing with my High Speed Rotation Actuator (ok, it was 
+ * a variable speed cordless electric drill) has shown that the device can measure
+ * speeds of up to 7 clicks either clockwise or anticlockwise between pollings from
+ * the host. If it counts more than 7 clicks before it is polled, it will wrap back
+ * to zero and start counting again. This was at quite high speed, however, almost
+ * certainly faster than the human hand could turn it. Griffin say that it loses a
+ * pulse or two on a direction change; the granularity is so fine that I never
+ * noticed this in practice.
+ *
+ * The device's microcontroller can be programmed to set the LED to either a constant
+ * intensity, or to a rhythmic pulsing. Several patterns and speeds are available.
+ *
+ * Griffin were very happy to provide documentation and free hardware for development.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+
+#define POWERMATE_VENDOR       0x077d    /* Griffin Technology, Inc. */
+#define POWERMATE_PRODUCT_NEW  0x0410    /* Griffin PowerMate */
+#define POWERMATE_PRODUCT_OLD  0x04AA    /* Griffin soundKnob */
+
+/* these are the command codes we send to the device */
+#define SET_STATIC_BRIGHTNESS  0x01
+#define SET_PULSE_ASLEEP       0x02
+#define SET_PULSE_AWAKE        0x03
+#define SET_PULSE_MODE         0x04
+
+/* these refer to bits in the powermate_device's requires_update field. */
+#define UPDATE_STATIC_BRIGHTNESS (1<<0)
+#define UPDATE_PULSE_ASLEEP      (1<<1)
+#define UPDATE_PULSE_AWAKE       (1<<2)
+#define UPDATE_PULSE_MODE        (1<<3)
+
+#define POWERMATE_PAYLOAD_SIZE 3
+struct powermate_device {
+	signed char data[POWERMATE_PAYLOAD_SIZE];
+	struct urb irq, config;
+	struct usb_ctrlrequest configdr;
+	struct usb_device *udev;
+	struct input_dev input;
+	struct semaphore lock;
+	int static_brightness;
+	int pulse_speed;
+	int pulse_table;
+	int pulse_asleep;
+	int pulse_awake;
+	int requires_update; // physical settings which are out of sync
+	char phys[64];
+};
+
+static char pm_name_powermate[] = "Griffin PowerMate";
+static char pm_name_soundknob[] = "Griffin SoundKnob";
+
+static void powermate_config_complete(struct urb *urb); /* forward declararation of callback */
+
+/* Callback for data arriving from the PowerMate over the USB interrupt pipe */
+static void powermate_irq(struct urb *urb)
+{
+	struct powermate_device *pm = urb->context;
+
+	if(urb->status)
+		return;
+
+	/* handle updates to device state */
+	input_report_key(&pm->input, BTN_0, pm->data[0] & 0x01);
+	input_report_rel(&pm->input, REL_DIAL, pm->data[1]);
+}
+
+/* Decide if we need to issue a control message and do so. Must be called with pm->lock down */
+static void powermate_sync_state(struct powermate_device *pm)
+{
+	if(pm->requires_update == 0) 
+		return; /* no updates are required */
+	if(pm->config.status == -EINPROGRESS) 
+		return; /* an update is already in progress; it'll issue this update when it completes */
+
+	if(pm->requires_update & UPDATE_PULSE_ASLEEP){
+		pm->configdr.wValue = cpu_to_le16( SET_PULSE_ASLEEP );
+		pm->configdr.wIndex = cpu_to_le16( pm->pulse_asleep ? 1 : 0 );
+		pm->requires_update &= ~UPDATE_PULSE_ASLEEP;
+	}else if(pm->requires_update & UPDATE_PULSE_AWAKE){
+		pm->configdr.wValue = cpu_to_le16( SET_PULSE_AWAKE );
+		pm->configdr.wIndex = cpu_to_le16( pm->pulse_awake ? 1 : 0 );
+		pm->requires_update &= ~UPDATE_PULSE_AWAKE;
+	}else if(pm->requires_update & UPDATE_PULSE_MODE){
+		int op, arg;
+		/* the powermate takes an operation and an argument for its pulse algorithm.
+		   the operation can be:
+		   0: divide the speed
+		   1: pulse at normal speed
+		   2: multiply the speed
+		   the argument only has an effect for operations 0 and 2, and ranges between
+		   1 (least effect) to 255 (maximum effect).
+       
+		   thus, several states are equivalent and are coalesced into one state.
+
+		   we map this onto a range from 0 to 510, with:
+		   0 -- 254    -- use divide (0 = slowest)
+		   255         -- use normal speed
+		   256 -- 510  -- use multiple (510 = fastest).
+
+		   Only values of 'arg' quite close to 255 are particularly useful/spectacular.
+		*/    
+		if(pm->pulse_speed < 255){
+			op = 0;                   // divide
+			arg = 255 - pm->pulse_speed;
+		}else if(pm->pulse_speed > 255){
+			op = 2;                   // multiply
+			arg = pm->pulse_speed - 255;
+		}else{
+			op = 1;                   // normal speed
+			arg = 0;                  // can be any value
+		}
+		pm->configdr.wValue = cpu_to_le16( (pm->pulse_table << 8) | SET_PULSE_MODE );
+		pm->configdr.wIndex = cpu_to_le16( (arg << 8) | op );
+		pm->requires_update &= ~UPDATE_PULSE_MODE;
+	}else if(pm->requires_update & UPDATE_STATIC_BRIGHTNESS){
+		pm->configdr.wValue = cpu_to_le16( SET_STATIC_BRIGHTNESS );
+		pm->configdr.wIndex = cpu_to_le16( pm->static_brightness );
+		pm->requires_update &= ~UPDATE_STATIC_BRIGHTNESS;
+	}else{
+		printk(KERN_ERR "powermate: unknown update required");
+		pm->requires_update = 0; /* fudge the bug */
+		return;
+	}
+
+	pm->config.dev = pm->udev; /* is this necessary? */
+	pm->configdr.bRequestType = 0x41; /* vendor request */
+	pm->configdr.bRequest = 0x01;
+	pm->configdr.wLength = 0;
+
+        FILL_CONTROL_URB(&pm->config, pm->udev, usb_sndctrlpipe(pm->udev, 0), 
+			 (void*)&pm->configdr, 0, 0, powermate_config_complete, pm);	
+
+	if(usb_submit_urb(&pm->config))
+		printk(KERN_ERR "powermate: usb_submit_urb(config) failed");
+}
+
+/* Called when our asynchronous control message completes. We may need to issue another immediately */
+static void powermate_config_complete(struct urb *urb)
+{
+	struct powermate_device *pm = urb->context;
+
+	if(urb->status)
+		printk(KERN_ERR "powermate: config urb returned %d\n", urb->status);
+	
+	down(&pm->lock);
+	powermate_sync_state(pm);
+	up(&pm->lock);
+}
+
+/* Set the LED up as described and begin the sync with the hardware if required */
+static void powermate_pulse_led(struct powermate_device *pm, int static_brightness, int pulse_speed, 
+				int pulse_table, int pulse_asleep, int pulse_awake)
+{
+	if(pulse_speed < 0)
+		pulse_speed = 0;
+	if(pulse_table < 0)
+		pulse_table = 0;
+	if(pulse_speed > 510)
+		pulse_speed = 510;
+	if(pulse_table > 2)
+		pulse_table = 2;
+
+	pulse_asleep = !!pulse_asleep;
+	pulse_awake = !!pulse_awake;
+
+	down(&pm->lock);
+
+	/* mark state updates which are required */
+	/* we update the static brightness if we've changed pulse mode,
+	   because the hardware seems to stick at an arbitrary value rather
+	   than jumping back to the static brightness we requested */
+	if(static_brightness != pm->static_brightness){
+		pm->static_brightness = static_brightness;
+		pm->requires_update |= UPDATE_STATIC_BRIGHTNESS;		
+	}
+	if(pulse_asleep != pm->pulse_asleep){
+		pm->pulse_asleep = pulse_asleep;
+		pm->requires_update |= (UPDATE_PULSE_ASLEEP | UPDATE_STATIC_BRIGHTNESS);
+	}
+	if(pulse_awake != pm->pulse_awake){
+		pm->pulse_awake = pulse_awake;
+		pm->requires_update |= (UPDATE_PULSE_AWAKE | UPDATE_STATIC_BRIGHTNESS);
+	}
+	if(pulse_speed != pm->pulse_speed || pulse_table != pm->pulse_table){
+		pm->pulse_speed = pulse_speed;
+		pm->pulse_table = pulse_table;
+		pm->requires_update |= UPDATE_PULSE_MODE;
+	}
+
+	powermate_sync_state(pm);
+   
+	up(&pm->lock);
+}
+
+/* Callback from the Input layer when an event arrives from userspace to configure the LED */
+static int powermate_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int _value)
+{
+	unsigned int command = (unsigned int)_value;
+	struct powermate_device *pm = dev->private;
+
+	if(type == EV_MSC && code == MSC_PULSELED){
+		/*  
+		    bits  0- 7: 8 bits: LED brightness
+		    bits  8-16: 9 bits: pulsing speed modifier (0 ... 510); 0-254 = slower, 255 = standard, 256-510 = faster.
+		    bits 17-18: 2 bits: pulse table (0, 1, 2 valid)
+		    bit     19: 1 bit : pulse whilst asleep?
+		    bit     20: 1 bit : pulse constantly?
+		*/  
+		int static_brightness = command & 0xFF;   // bits 0-7
+		int pulse_speed = (command >> 8) & 0x1FF; // bits 8-16
+		int pulse_table = (command >> 17) & 0x3;  // bits 17-18
+		int pulse_asleep = (command >> 19) & 0x1; // bit 19
+		int pulse_awake  = (command >> 20) & 0x1; // bit 20
+  
+		powermate_pulse_led(pm, static_brightness, pulse_speed, pulse_table, pulse_asleep, pulse_awake);
+	}
+
+	return 0;
+}
+
+/* Called whenever a USB device matching one in our supported devices table is connected */
+static void *powermate_probe(struct usb_device *udev, unsigned int ifnum, const struct usb_device_id *id)
+{
+	struct usb_interface_descriptor *interface;
+	struct usb_endpoint_descriptor *endpoint;
+	struct powermate_device *pm;
+	int pipe, maxp;
+
+	interface = udev->config[0].interface[ifnum].altsetting + 0;
+	endpoint = interface->endpoint + 0;
+	if (!(endpoint->bEndpointAddress & 0x80)) return NULL;
+	if ((endpoint->bmAttributes & 3) != 3) return NULL;
+
+	usb_set_protocol(udev, interface->bInterfaceNumber, 0);
+	usb_set_idle(udev, interface->bInterfaceNumber, 0, 0);
+
+	if (!(pm = kmalloc(sizeof(struct powermate_device), GFP_KERNEL)))
+		return NULL;
+
+	memset(pm, 0, sizeof(struct powermate_device));
+	pm->udev = udev;
+
+	init_MUTEX(&pm->lock);
+
+	/* get a handle to the interrupt data pipe */
+	pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
+	maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+
+	if(maxp != POWERMATE_PAYLOAD_SIZE)
+		printk("powermate: Expected payload of %d bytes, found %d bytes!\n", POWERMATE_PAYLOAD_SIZE, maxp);
+
+	FILL_INT_URB(&pm->irq, udev, pipe, pm->data, POWERMATE_PAYLOAD_SIZE, powermate_irq, pm, endpoint->bInterval);
+
+	/* register our interrupt URB with the USB system */
+	if(usb_submit_urb(&pm->irq)) {
+		kfree(pm);
+		return NULL; /* failure */
+	}
+
+	switch (udev->descriptor.idProduct) {
+	case POWERMATE_PRODUCT_NEW: pm->input.name = pm_name_powermate; break;
+	case POWERMATE_PRODUCT_OLD: pm->input.name = pm_name_soundknob; break;
+	default: 
+	  pm->input.name = pm_name_soundknob;
+	  printk(KERN_WARNING "powermate: unknown product id %04x\n", udev->descriptor.idProduct);
+	}
+
+	pm->input.private = pm;
+	pm->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_MSC);
+	pm->input.keybit[LONG(BTN_0)] = BIT(BTN_0);
+	pm->input.relbit[LONG(REL_DIAL)] = BIT(REL_DIAL);
+	pm->input.mscbit[LONG(MSC_PULSELED)] = BIT(MSC_PULSELED);
+	pm->input.idbus = BUS_USB;
+	pm->input.idvendor = udev->descriptor.idVendor;
+	pm->input.idproduct = udev->descriptor.idProduct;
+	pm->input.idversion = udev->descriptor.bcdDevice;
+	pm->input.event = powermate_input_event;
+
+	input_register_device(&pm->input);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) /* Vojtech -- is this the correct version? */
+	{
+		char path[64];
+		usb_make_path(udev, path, 64);
+		snprintf(pm->phys, 64, "%s/input0", path);
+		printk(KERN_INFO "input: %s on %s\n", pm->input.name, pm->input.path);
+	}
+#else
+	printk(KERN_INFO "input: %s on input%d\n", pm->input.name, pm->input.number);
+#endif
+	
+	/* force an update of everything */
+	pm->requires_update = UPDATE_PULSE_ASLEEP | UPDATE_PULSE_AWAKE | UPDATE_PULSE_MODE | UPDATE_STATIC_BRIGHTNESS;
+	powermate_pulse_led(pm, 0x80, 255, 0, 1, 0); // set default pulse parameters
+  
+	return pm;
+}
+
+/* Called when a USB device we've accepted ownership of is removed */
+static void powermate_disconnect(struct usb_device *dev, void *ptr)
+{
+	struct powermate_device *pm = ptr;
+	down(&pm->lock);
+	pm->requires_update = 0;
+	usb_unlink_urb(&pm->irq);  
+	input_unregister_device(&pm->input);
+  
+	kfree(pm);
+}
+
+static struct usb_device_id powermate_devices [] = {
+	{ USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_NEW) },
+	{ USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_OLD) },
+	{ } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, powermate_devices);
+
+static struct usb_driver powermate_driver = {
+        name:           "powermate",
+        probe:          powermate_probe,
+        disconnect:     powermate_disconnect,
+        id_table:       powermate_devices,
+};
+
+int powermate_init(void)
+{
+	if (usb_register(&powermate_driver) < 0)
+		return -1;
+	return 0;
+}
+
+void powermate_cleanup(void)
+{
+	usb_deregister(&powermate_driver);
+}
+
+module_init(powermate_init);
+module_exit(powermate_cleanup);
+
+MODULE_AUTHOR( "William R Sowerbutts" );
+MODULE_DESCRIPTION( "Griffin Technology, Inc PowerMate driver" );
+MODULE_LICENSE("GPL");