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Add support for two Super-IO chips

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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
2015-03-28 08:30:47 -07:00
parent 44c6a98613
commit 9c1361716e
1 changed files with 125 additions and 92 deletions
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215
it87.c
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@@ -77,11 +77,12 @@ static unsigned short force_id;
module_param(force_id, ushort, 0); module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID"); MODULE_PARM_DESC(force_id, "Override the detected device ID");
static struct platform_device *pdev; static struct platform_device *it87_pdev[2];
#define REG_2E 0x2e /* The register to read/write */
#define REG_4E 0x4e /* Secondary register to read/write */
#define REG 0x2e /* The register to read/write */
#define DEV 0x07 /* Register: Logical device select */ #define DEV 0x07 /* Register: Logical device select */
#define VAL 0x2f /* The value to read/write */
#define PME 0x04 /* The device with the fan registers in it */ #define PME 0x04 /* The device with the fan registers in it */
/* The device with the IT8718F/IT8720F VID value in it */ /* The device with the IT8718F/IT8720F VID value in it */
@@ -90,54 +91,54 @@ static struct platform_device *pdev;
#define DEVID 0x20 /* Register: Device ID */ #define DEVID 0x20 /* Register: Device ID */
#define DEVREV 0x22 /* Register: Device Revision */ #define DEVREV 0x22 /* Register: Device Revision */
static inline int superio_inb(int reg) static inline int superio_inb(int ioreg, int reg)
{ {
outb(reg, REG); outb(reg, ioreg);
return inb(VAL); return inb(ioreg + 1);
} }
static inline void superio_outb(int reg, int val) static inline void superio_outb(int ioreg, int reg, int val)
{ {
outb(reg, REG); outb(reg, ioreg);
outb(val, VAL); outb(val, ioreg + 1);
} }
static int superio_inw(int reg) static int superio_inw(int ioreg, int reg)
{ {
int val; int val;
outb(reg++, REG); outb(reg++, ioreg);
val = inb(VAL) << 8; val = inb(ioreg + 1) << 8;
outb(reg, REG); outb(reg, ioreg);
val |= inb(VAL); val |= inb(ioreg + 1);
return val; return val;
} }
static inline void superio_select(int ldn) static inline void superio_select(int ioreg, int ldn)
{ {
outb(DEV, REG); outb(DEV, ioreg);
outb(ldn, VAL); outb(ldn, ioreg + 1);
} }
static inline int superio_enter(void) static inline int superio_enter(int ioreg)
{ {
/* /*
* Try to reserve REG and REG + 1 for exclusive access. * Try to reserve ioreg and ioreg + 1 for exclusive access.
*/ */
if (!request_muxed_region(REG, 2, DRVNAME)) if (!request_muxed_region(ioreg, 2, DRVNAME))
return -EBUSY; return -EBUSY;
outb(0x87, REG); outb(0x87, ioreg);
outb(0x01, REG); outb(0x01, ioreg);
outb(0x55, REG); outb(0x55, ioreg);
outb(0x55, REG); outb(0x55, ioreg);
return 0; return 0;
} }
static inline void superio_exit(void) static inline void superio_exit(int ioreg)
{ {
outb(0x02, REG); outb(0x02, ioreg);
outb(0x02, VAL); outb(0x02, ioreg + 1);
release_region(REG, 2); release_region(ioreg, 2);
} }
/* Logical device 4 registers */ /* Logical device 4 registers */
@@ -266,9 +267,9 @@ struct it87_devices {
#define FEAT_TEMP_OLD_PECI (1 << 6) #define FEAT_TEMP_OLD_PECI (1 << 6)
#define FEAT_FAN16_CONFIG (1 << 7) /* Need to enable 16-bit fans */ #define FEAT_FAN16_CONFIG (1 << 7) /* Need to enable 16-bit fans */
#define FEAT_FIVE_FANS (1 << 8) /* Supports five fans */ #define FEAT_FIVE_FANS (1 << 8) /* Supports five fans */
#define FEAT_SIX_FANS (1 << 9) /* Supports six fans */ #define FEAT_VID (1 << 9) /* Set if chip supports VID */
#define FEAT_VID (1 << 10) /* Set if chip supports VID */ #define FEAT_IN7_INTERNAL (1 << 10) /* Set if in7 is internal */
#define FEAT_IN7_INTERNAL (1 << 11) /* Set if in7 is internal */ #define FEAT_SIX_FANS (1 << 11) /* Supports six fans */
#define FEAT_AVCC3 (1 << 12) /* Chip supports in9/AVCC3 */ #define FEAT_AVCC3 (1 << 12) /* Chip supports in9/AVCC3 */
#define FEAT_SIX_PWM (1 << 13) /* Chip supports 6 pwm chn */ #define FEAT_SIX_PWM (1 << 13) /* Chip supports 6 pwm chn */
#define FEAT_PWM_FREQ2 (1 << 14) /* Separate pwm freq 2 */ #define FEAT_PWM_FREQ2 (1 << 14) /* Separate pwm freq 2 */
@@ -418,9 +419,9 @@ static const struct it87_devices it87_devices[] = {
#define has_fan16_config(data) ((data)->features & FEAT_FAN16_CONFIG) #define has_fan16_config(data) ((data)->features & FEAT_FAN16_CONFIG)
#define has_five_fans(data) ((data)->features & (FEAT_FIVE_FANS | \ #define has_five_fans(data) ((data)->features & (FEAT_FIVE_FANS | \
FEAT_SIX_FANS)) FEAT_SIX_FANS))
#define has_six_fans(data) ((data)->features & FEAT_SIX_FANS)
#define has_vid(data) ((data)->features & FEAT_VID) #define has_vid(data) ((data)->features & FEAT_VID)
#define has_in7_internal(data) ((data)->features & FEAT_IN7_INTERNAL) #define has_in7_internal(data) ((data)->features & FEAT_IN7_INTERNAL)
#define has_six_fans(data) ((data)->features & FEAT_SIX_FANS)
#define has_avcc3(data) ((data)->features & FEAT_AVCC3) #define has_avcc3(data) ((data)->features & FEAT_AVCC3)
#define has_six_pwm(data) ((data)->features & FEAT_SIX_PWM) #define has_six_pwm(data) ((data)->features & FEAT_SIX_PWM)
#define has_pwm_freq2(data) ((data)->features & FEAT_PWM_FREQ2) #define has_pwm_freq2(data) ((data)->features & FEAT_PWM_FREQ2)
@@ -562,6 +563,16 @@ static int DIV_TO_REG(int val)
} }
#define DIV_FROM_REG(val) (1 << (val)) #define DIV_FROM_REG(val) (1 << (val))
/*
* pwm base frequencies. The frequency has to be divided by either 128 or 256,
* depending on the chip type, to calculate the actual pwm frequency.
*
* Some of the chip datasheets suggest a base frequency of 51kHz instead
* of 750kHz for the slowest base frequency, resulting in a pwm frequency
* of 200Hz. Sometimes both pwm frequency select registers are affected,
* sometimes just one. It is unknown if this is a datasheet error or real,
* so this is ignored for now.
*/
static const unsigned int pwm_freq[8] = { static const unsigned int pwm_freq[8] = {
48000000, 48000000,
24000000, 24000000,
@@ -1895,19 +1906,19 @@ static const struct attribute_group it87_group_label = {
}; };
/* SuperIO detection - will change isa_address if a chip is found */ /* SuperIO detection - will change isa_address if a chip is found */
static int __init it87_find(unsigned short *address, static int __init it87_find(int sioaddr, unsigned short *address,
struct it87_sio_data *sio_data) struct it87_sio_data *sio_data)
{ {
int err; int err;
u16 chip_type; u16 chip_type;
const char *board_vendor, *board_name; const char *board_vendor, *board_name;
err = superio_enter(); err = superio_enter(sioaddr);
if (err) if (err)
return err; return err;
err = -ENODEV; err = -ENODEV;
chip_type = force_id ? force_id : superio_inw(DEVID); chip_type = force_id ? force_id : superio_inw(sioaddr, DEVID);
switch (chip_type) { switch (chip_type) {
case IT8705F_DEVID: case IT8705F_DEVID:
@@ -1950,6 +1961,9 @@ static int __init it87_find(unsigned short *address,
case IT8786E_DEVID: case IT8786E_DEVID:
sio_data->type = it8786; sio_data->type = it8786;
break; break;
case IT8790E_DEVID:
sio_data->type = it8790;
break;
case IT8603E_DEVID: case IT8603E_DEVID:
case IT8623E_DEVID: case IT8623E_DEVID:
sio_data->type = it8603; sio_data->type = it8603;
@@ -1957,9 +1971,6 @@ static int __init it87_find(unsigned short *address,
case IT8620E_DEVID: case IT8620E_DEVID:
sio_data->type = it8620; sio_data->type = it8620;
break; break;
case IT8790E_DEVID:
sio_data->type = it8790;
break;
case 0xffff: /* No device at all */ case 0xffff: /* No device at all */
goto exit; goto exit;
default: default:
@@ -1967,20 +1978,20 @@ static int __init it87_find(unsigned short *address,
goto exit; goto exit;
} }
superio_select(PME); superio_select(sioaddr, PME);
if (!(superio_inb(IT87_ACT_REG) & 0x01)) { if (!(superio_inb(sioaddr, IT87_ACT_REG) & 0x01)) {
pr_info("Device not activated, skipping\n"); pr_info("Device not activated, skipping\n");
goto exit; goto exit;
} }
*address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1); *address = superio_inw(sioaddr, IT87_BASE_REG) & ~(IT87_EXTENT - 1);
if (*address == 0) { if (*address == 0) {
pr_info("Base address not set, skipping\n"); pr_info("Base address not set, skipping\n");
goto exit; goto exit;
} }
err = 0; err = 0;
sio_data->revision = superio_inb(DEVREV) & 0x0f; sio_data->revision = superio_inb(sioaddr, DEVREV) & 0x0f;
pr_info("Found IT%04x%s chip at 0x%x, revision %d\n", chip_type, pr_info("Found IT%04x%s chip at 0x%x, revision %d\n", chip_type,
it87_devices[sio_data->type].suffix, it87_devices[sio_data->type].suffix,
*address, sio_data->revision); *address, sio_data->revision);
@@ -2007,18 +2018,19 @@ static int __init it87_find(unsigned short *address,
/* Read GPIO config and VID value from LDN 7 (GPIO) */ /* Read GPIO config and VID value from LDN 7 (GPIO) */
if (sio_data->type == it87) { if (sio_data->type == it87) {
/* The IT8705F has a different LD number for GPIO */ /* The IT8705F has a different LD number for GPIO */
superio_select(5); superio_select(sioaddr, 5);
sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
} else if (sio_data->type == it8783) { } else if (sio_data->type == it8783) {
int reg25, reg27, reg2a, reg2c, regef; int reg25, reg27, reg2a, reg2c, regef;
superio_select(GPIO); superio_select(sioaddr, GPIO);
reg25 = superio_inb(IT87_SIO_GPIO1_REG); reg25 = superio_inb(sioaddr, IT87_SIO_GPIO1_REG);
reg27 = superio_inb(IT87_SIO_GPIO3_REG); reg27 = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
reg2a = superio_inb(IT87_SIO_PINX1_REG); reg2a = superio_inb(sioaddr, IT87_SIO_PINX1_REG);
reg2c = superio_inb(IT87_SIO_PINX2_REG); reg2c = superio_inb(sioaddr, IT87_SIO_PINX2_REG);
regef = superio_inb(IT87_SIO_SPI_REG); regef = superio_inb(sioaddr, IT87_SIO_SPI_REG);
/* Check if fan3 is there or not */ /* Check if fan3 is there or not */
if ((reg27 & (1 << 0)) || !(reg2c & (1 << 2))) if ((reg27 & (1 << 0)) || !(reg2c & (1 << 2)))
@@ -2061,7 +2073,7 @@ static int __init it87_find(unsigned short *address,
*/ */
if (!(reg2c & (1 << 1))) { if (!(reg2c & (1 << 1))) {
reg2c |= (1 << 1); reg2c |= (1 << 1);
superio_outb(IT87_SIO_PINX2_REG, reg2c); superio_outb(sioaddr, IT87_SIO_PINX2_REG, reg2c);
pr_notice("Routing internal VCCH5V to in7.\n"); pr_notice("Routing internal VCCH5V to in7.\n");
} }
pr_notice("in7 routed to internal voltage divider, with external pin disabled.\n"); pr_notice("in7 routed to internal voltage divider, with external pin disabled.\n");
@@ -2073,13 +2085,14 @@ static int __init it87_find(unsigned short *address,
if (reg2c & (1 << 1)) if (reg2c & (1 << 1))
sio_data->internal |= (1 << 1); sio_data->internal |= (1 << 1);
sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
} else if (sio_data->type == it8603) { } else if (sio_data->type == it8603) {
int reg27, reg29; int reg27, reg29;
superio_select(GPIO); superio_select(sioaddr, GPIO);
reg27 = superio_inb(IT87_SIO_GPIO3_REG); reg27 = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
/* Check if fan3 is there or not */ /* Check if fan3 is there or not */
if (reg27 & (1 << 6)) if (reg27 & (1 << 6))
@@ -2088,7 +2101,7 @@ static int __init it87_find(unsigned short *address,
sio_data->skip_fan |= (1 << 2); sio_data->skip_fan |= (1 << 2);
/* Check if fan2 is there or not */ /* Check if fan2 is there or not */
reg29 = superio_inb(IT87_SIO_GPIO5_REG); reg29 = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
if (reg29 & (1 << 1)) if (reg29 & (1 << 1))
sio_data->skip_pwm |= (1 << 1); sio_data->skip_pwm |= (1 << 1);
if (reg29 & (1 << 2)) if (reg29 & (1 << 2))
@@ -2097,38 +2110,39 @@ static int __init it87_find(unsigned short *address,
sio_data->skip_in |= (1 << 5); /* No VIN5 */ sio_data->skip_in |= (1 << 5); /* No VIN5 */
sio_data->skip_in |= (1 << 6); /* No VIN6 */ sio_data->skip_in |= (1 << 6); /* No VIN6 */
sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
} else if (sio_data->type == it8620) { } else if (sio_data->type == it8620) {
int reg; int reg;
superio_select(GPIO); superio_select(sioaddr, GPIO);
/* Check for pwm5 */ /* Check for pwm5 */
reg = superio_inb(IT87_SIO_GPIO1_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO1_REG);
if (reg & (1 << 6)) if (reg & (1 << 6))
sio_data->skip_pwm |= (1 << 4); sio_data->skip_pwm |= (1 << 4);
/* Check for fan4, fan5 */ /* Check for fan4, fan5 */
reg = superio_inb(IT87_SIO_GPIO2_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO2_REG);
if (!(reg & (1 << 5))) if (!(reg & (1 << 5)))
sio_data->skip_fan |= (1 << 3); sio_data->skip_fan |= (1 << 3);
if (!(reg & (1 << 4))) if (!(reg & (1 << 4)))
sio_data->skip_fan |= (1 << 4); sio_data->skip_fan |= (1 << 4);
/* Check for pwm3, fan3 */ /* Check for pwm3, fan3 */
reg = superio_inb(IT87_SIO_GPIO3_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
if (reg & (1 << 6)) if (reg & (1 << 6))
sio_data->skip_pwm |= (1 << 2); sio_data->skip_pwm |= (1 << 2);
if (reg & (1 << 7)) if (reg & (1 << 7))
sio_data->skip_fan |= (1 << 2); sio_data->skip_fan |= (1 << 2);
/* Check for pwm4 */ /* Check for pwm4 */
reg = superio_inb(IT87_SIO_GPIO4_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO4_REG);
if (!(reg & (1 << 4))) if (!(reg & (1 << 4)))
sio_data->skip_pwm |= (1 << 3); sio_data->skip_pwm |= (1 << 3);
/* Check for pwm2, fan2 */ /* Check for pwm2, fan2 */
reg = superio_inb(IT87_SIO_GPIO5_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
if (reg & (1 << 1)) if (reg & (1 << 1))
sio_data->skip_pwm |= (1 << 1); sio_data->skip_pwm |= (1 << 1);
if (reg & (1 << 2)) if (reg & (1 << 2))
@@ -2139,14 +2153,15 @@ static int __init it87_find(unsigned short *address,
sio_data->skip_fan |= (1 << 5); sio_data->skip_fan |= (1 << 5);
} }
sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
} else { } else {
int reg; int reg;
bool uart6; bool uart6;
superio_select(GPIO); superio_select(sioaddr, GPIO);
reg = superio_inb(IT87_SIO_GPIO3_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
if (!sio_data->skip_vid) { if (!sio_data->skip_vid) {
/* We need at least 4 VID pins */ /* We need at least 4 VID pins */
if (reg & 0x0f) { if (reg & 0x0f) {
@@ -2162,7 +2177,7 @@ static int __init it87_find(unsigned short *address,
sio_data->skip_fan |= (1 << 2); sio_data->skip_fan |= (1 << 2);
/* Check if fan2 is there or not */ /* Check if fan2 is there or not */
reg = superio_inb(IT87_SIO_GPIO5_REG); reg = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
if (reg & (1 << 1)) if (reg & (1 << 1))
sio_data->skip_pwm |= (1 << 1); sio_data->skip_pwm |= (1 << 1);
if (reg & (1 << 2)) if (reg & (1 << 2))
@@ -2170,9 +2185,10 @@ static int __init it87_find(unsigned short *address,
if ((sio_data->type == it8718 || sio_data->type == it8720) if ((sio_data->type == it8718 || sio_data->type == it8720)
&& !(sio_data->skip_vid)) && !(sio_data->skip_vid))
sio_data->vid_value = superio_inb(IT87_SIO_VID_REG); sio_data->vid_value = superio_inb(sioaddr,
IT87_SIO_VID_REG);
reg = superio_inb(IT87_SIO_PINX2_REG); reg = superio_inb(sioaddr, IT87_SIO_PINX2_REG);
uart6 = sio_data->type == it8782 && (reg & (1 << 2)); uart6 = sio_data->type == it8782 && (reg & (1 << 2));
@@ -2192,7 +2208,7 @@ static int __init it87_find(unsigned short *address,
*/ */
if ((sio_data->type == it8720 || uart6) && !(reg & (1 << 1))) { if ((sio_data->type == it8720 || uart6) && !(reg & (1 << 1))) {
reg |= (1 << 1); reg |= (1 << 1);
superio_outb(IT87_SIO_PINX2_REG, reg); superio_outb(sioaddr, IT87_SIO_PINX2_REG, reg);
pr_notice("Routing internal VCCH to in7\n"); pr_notice("Routing internal VCCH to in7\n");
} }
if (reg & (1 << 0)) if (reg & (1 << 0))
@@ -2214,7 +2230,8 @@ static int __init it87_find(unsigned short *address,
sio_data->skip_temp |= (1 << 2); sio_data->skip_temp |= (1 << 2);
} }
sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
} }
if (sio_data->beep_pin) if (sio_data->beep_pin)
pr_info("Beeping is supported\n"); pr_info("Beeping is supported\n");
@@ -2239,13 +2256,13 @@ static int __init it87_find(unsigned short *address,
} }
exit: exit:
superio_exit(); superio_exit(sioaddr);
return err; return err;
} }
static void it87_remove_files(struct device *dev) static void it87_remove_files(struct device *dev)
{ {
struct it87_data *data = platform_get_drvdata(pdev); struct it87_data *data = dev_get_drvdata(dev);
struct it87_sio_data *sio_data = dev_get_platdata(dev); struct it87_sio_data *sio_data = dev_get_platdata(dev);
int i; int i;
@@ -2847,9 +2864,10 @@ static struct it87_data *it87_update_device(struct device *dev)
return data; return data;
} }
static int __init it87_device_add(unsigned short address, static int __init it87_device_add(int index, unsigned short address,
const struct it87_sio_data *sio_data) const struct it87_sio_data *sio_data)
{ {
struct platform_device *pdev;
struct resource res = { struct resource res = {
.start = address + IT87_EC_OFFSET, .start = address + IT87_EC_OFFSET,
.end = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1, .end = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
@@ -2860,14 +2878,11 @@ static int __init it87_device_add(unsigned short address,
err = acpi_check_resource_conflict(&res); err = acpi_check_resource_conflict(&res);
if (err) if (err)
goto exit; return err;
pdev = platform_device_alloc(DRVNAME, address); pdev = platform_device_alloc(DRVNAME, address);
if (!pdev) { if (!pdev)
err = -ENOMEM; return -ENOMEM;
pr_err("Device allocation failed\n");
goto exit;
}
err = platform_device_add_resources(pdev, &res, 1); err = platform_device_add_resources(pdev, &res, 1);
if (err) { if (err) {
@@ -2888,40 +2903,58 @@ static int __init it87_device_add(unsigned short address,
goto exit_device_put; goto exit_device_put;
} }
it87_pdev[index] = pdev;
return 0; return 0;
exit_device_put: exit_device_put:
platform_device_put(pdev); platform_device_put(pdev);
exit:
return err; return err;
} }
static int __init sm_it87_init(void) static int __init sm_it87_init(void)
{ {
int err; int sioaddr[2] = { REG_2E, REG_4E };
unsigned short isa_address = 0;
struct it87_sio_data sio_data; struct it87_sio_data sio_data;
unsigned short isa_address;
bool found = false;
int i, err;
memset(&sio_data, 0, sizeof(struct it87_sio_data));
err = it87_find(&isa_address, &sio_data);
if (err)
return err;
err = platform_driver_register(&it87_driver); err = platform_driver_register(&it87_driver);
if (err) if (err)
return err; return err;
err = it87_device_add(isa_address, &sio_data); for (i = 0; i < ARRAY_SIZE(sioaddr); i++) {
if (err) { memset(&sio_data, 0, sizeof(struct it87_sio_data));
platform_driver_unregister(&it87_driver); isa_address = 0;
return err; err = it87_find(sioaddr[i], &isa_address, &sio_data);
if (err || isa_address == 0)
continue;
err = it87_device_add(i, isa_address, &sio_data);
if (err)
goto exit_dev_unregister;
found = true;
} }
if (!found) {
err = -ENODEV;
goto exit_unregister;
}
return 0; return 0;
exit_dev_unregister:
/* NULL check handled by platform_device_unregister */
platform_device_unregister(it87_pdev[0]);
exit_unregister:
platform_driver_unregister(&it87_driver);
return err;
} }
static void __exit sm_it87_exit(void) static void __exit sm_it87_exit(void)
{ {
platform_device_unregister(pdev); /* NULL check handled by platform_device_unregister */
platform_device_unregister(it87_pdev[1]);
platform_device_unregister(it87_pdev[0]);
platform_driver_unregister(&it87_driver); platform_driver_unregister(&it87_driver);
} }