diff options
Diffstat (limited to 'drivers/usb/misc/cytherm.c')
| -rw-r--r-- | drivers/usb/misc/cytherm.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c new file mode 100644 index 000000000..8b15ab5e1 --- /dev/null +++ b/drivers/usb/misc/cytherm.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0 +/* -*- linux-c -*- + * Cypress USB Thermometer driver + * + * Copyright (c) 2004 Erik Rigtorp <erkki@linux.nu> <erik@rigtorp.com> + * + * This driver works with Elektor magazine USB Interface as published in + * issue #291. It should also work with the original starter kit/demo board + * from Cypress. + */ + + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/usb.h> + +#define DRIVER_AUTHOR "Erik Rigtorp" +#define DRIVER_DESC "Cypress USB Thermometer driver" + +#define USB_SKEL_VENDOR_ID 0x04b4 +#define USB_SKEL_PRODUCT_ID 0x0002 + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) }, + { } +}; +MODULE_DEVICE_TABLE (usb, id_table); + +/* Structure to hold all of our device specific stuff */ +struct usb_cytherm { + struct usb_device *udev; /* save off the usb device pointer */ + struct usb_interface *interface; /* the interface for this device */ + int brightness; +}; + + +/* local function prototypes */ +static int cytherm_probe(struct usb_interface *interface, + const struct usb_device_id *id); +static void cytherm_disconnect(struct usb_interface *interface); + + +/* usb specific object needed to register this driver with the usb subsystem */ +static struct usb_driver cytherm_driver = { + .name = "cytherm", + .probe = cytherm_probe, + .disconnect = cytherm_disconnect, + .id_table = id_table, +}; + +/* Vendor requests */ +/* They all operate on one byte at a time */ +#define PING 0x00 +#define READ_ROM 0x01 /* Reads form ROM, value = address */ +#define READ_RAM 0x02 /* Reads form RAM, value = address */ +#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */ +#define READ_PORT 0x04 /* Reads from port, value = address */ +#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */ + + +/* Send a vendor command to device */ +static int vendor_command(struct usb_device *dev, unsigned char request, + unsigned char value, unsigned char index, + void *buf, int size) +{ + return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), + request, + USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER, + value, + index, buf, size, + USB_CTRL_GET_TIMEOUT); +} + + + +#define BRIGHTNESS 0x2c /* RAM location for brightness value */ +#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */ + +static ssize_t brightness_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + return sprintf(buf, "%i", cytherm->brightness); +} + +static ssize_t brightness_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + unsigned char *buffer; + int retval; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + cytherm->brightness = simple_strtoul(buf, NULL, 10); + + if (cytherm->brightness > 0xFF) + cytherm->brightness = 0xFF; + else if (cytherm->brightness < 0) + cytherm->brightness = 0; + + /* Set brightness */ + retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS, + cytherm->brightness, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + /* Inform µC that we have changed the brightness setting */ + retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM, + 0x01, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + kfree(buffer); + + return count; +} +static DEVICE_ATTR_RW(brightness); + + +#define TEMP 0x33 /* RAM location for temperature */ +#define SIGN 0x34 /* RAM location for temperature sign */ + +static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + int retval; + unsigned char *buffer; + + int temp, sign; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + /* read temperature */ + retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + temp = buffer[1]; + + /* read sign */ + retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + sign = buffer[1]; + + kfree(buffer); + + return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1, + 5*(temp - ((temp >> 1) << 1))); +} +static DEVICE_ATTR_RO(temp); + + +#define BUTTON 0x7a + +static ssize_t button_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + int retval; + unsigned char *buffer; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + /* check button */ + retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + retval = buffer[1]; + + kfree(buffer); + + if (retval) + return sprintf(buf, "1"); + else + return sprintf(buf, "0"); +} +static DEVICE_ATTR_RO(button); + + +static ssize_t port0_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + int retval; + unsigned char *buffer; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + retval = buffer[1]; + + kfree(buffer); + + return sprintf(buf, "%d", retval); +} + + +static ssize_t port0_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + unsigned char *buffer; + int retval; + int tmp; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + tmp = simple_strtoul(buf, NULL, 10); + + if (tmp > 0xFF) + tmp = 0xFF; + else if (tmp < 0) + tmp = 0; + + retval = vendor_command(cytherm->udev, WRITE_PORT, 0, + tmp, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + kfree(buffer); + + return count; +} +static DEVICE_ATTR_RW(port0); + +static ssize_t port1_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + int retval; + unsigned char *buffer; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + retval = buffer[1]; + + kfree(buffer); + + return sprintf(buf, "%d", retval); +} + + +static ssize_t port1_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_cytherm *cytherm = usb_get_intfdata(intf); + + unsigned char *buffer; + int retval; + int tmp; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) + return 0; + + tmp = simple_strtoul(buf, NULL, 10); + + if (tmp > 0xFF) + tmp = 0xFF; + else if (tmp < 0) + tmp = 0; + + retval = vendor_command(cytherm->udev, WRITE_PORT, 1, + tmp, buffer, 8); + if (retval) + dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); + + kfree(buffer); + + return count; +} +static DEVICE_ATTR_RW(port1); + + +static int cytherm_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(interface); + struct usb_cytherm *dev = NULL; + int retval = -ENOMEM; + + dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL); + if (!dev) + goto error_mem; + + dev->udev = usb_get_dev(udev); + + usb_set_intfdata (interface, dev); + + dev->brightness = 0xFF; + + retval = device_create_file(&interface->dev, &dev_attr_brightness); + if (retval) + goto error; + retval = device_create_file(&interface->dev, &dev_attr_temp); + if (retval) + goto error; + retval = device_create_file(&interface->dev, &dev_attr_button); + if (retval) + goto error; + retval = device_create_file(&interface->dev, &dev_attr_port0); + if (retval) + goto error; + retval = device_create_file(&interface->dev, &dev_attr_port1); + if (retval) + goto error; + + dev_info (&interface->dev, + "Cypress thermometer device now attached\n"); + return 0; +error: + device_remove_file(&interface->dev, &dev_attr_brightness); + device_remove_file(&interface->dev, &dev_attr_temp); + device_remove_file(&interface->dev, &dev_attr_button); + device_remove_file(&interface->dev, &dev_attr_port0); + device_remove_file(&interface->dev, &dev_attr_port1); + usb_set_intfdata (interface, NULL); + usb_put_dev(dev->udev); + kfree(dev); +error_mem: + return retval; +} + +static void cytherm_disconnect(struct usb_interface *interface) +{ + struct usb_cytherm *dev; + + dev = usb_get_intfdata (interface); + + device_remove_file(&interface->dev, &dev_attr_brightness); + device_remove_file(&interface->dev, &dev_attr_temp); + device_remove_file(&interface->dev, &dev_attr_button); + device_remove_file(&interface->dev, &dev_attr_port0); + device_remove_file(&interface->dev, &dev_attr_port1); + + /* first remove the files, then NULL the pointer */ + usb_set_intfdata (interface, NULL); + + usb_put_dev(dev->udev); + + kfree(dev); + + dev_info(&interface->dev, "Cypress thermometer now disconnected\n"); +} + +module_usb_driver(cytherm_driver); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |