Messages in this thread Patch in this message |  | | Date | Sun, 15 Sep 2002 18:39:10 -0400 (EDT) | From | Albert Cranford <> | Subject | [patch 4/9]Four new i2c drivers and __init/__exit cleanup to i2c |
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Hello Linus, New I2C drivers that have been adjusted after Russell King comments of August. o i2c-algo-8xx.c o i2c-pport.c o i2c-adap-ibm_ocp.c o i2c-pcf-epp.c o Add new drivers to Config.in and Makefile. o Add new drivers to i2c-core for initialization. o Remove EXPORT_NO_SYMBOLS statement from i2c-dev, i2c-elektor and i2c-frodo. o Cleanup init_module and cleanup_module adding __init and __exit to most drivers. o Adjust i2c-elektor with cli/sti replacement. -- ac9410@attbi.com --- /dev/null 1994-07-17 19:46:18.000000000 -0400 +++ linux-2.5.34/drivers/i2c/i2c-pcf-epp.c 2002-08-07 22:39:16.000000000 -0400 @@ -0,0 +1,307 @@ +/* ------------------------------------------------------------------------- */ +/* i2c-pcf-epp.c i2c-hw access for PCF8584 style EPP parallel port adapters */ +/* ------------------------------------------------------------------------- */ + +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/version.h> +#include <linux/init.h> +#include <linux/parport.h> +#include <asm/irq.h> +#include <asm/io.h> + +#include <linux/i2c.h> +#include <linux/i2c-algo-pcf.h> +#include "i2c-pcf8584.h" + +struct i2c_pcf_epp { + int pe_base; + int pe_irq; + int pe_clock; + int pe_own; +} ; + +#define DEFAULT_BASE 0x378 +#define DEFAULT_IRQ 7 +#define DEFAULT_CLOCK 0x1c +#define DEFAULT_OWN 0x55 + +static int base = 0; +static int irq = 0; +static int clock = 0; +static int own = 0; +static int i2c_debug=0; +static struct i2c_pcf_epp gpe; +static wait_queue_head_t pcf_wait; +static int pcf_pending; + +/* ----- global defines ----------------------------------------------- */ +#define DEB(x) if (i2c_debug>=1) x +#define DEB2(x) if (i2c_debug>=2) x +#define DEB3(x) if (i2c_debug>=3) x +#define DEBE(x) x /* error messages */ + +/* --- Convenience defines for the EPP/SPP port: */ +#define BASE ((struct i2c_pcf_epp *)(data))->pe_base +// #define DATA BASE /* SPP data port */ +#define STAT (BASE+1) /* SPP status port */ +#define CTRL (BASE+2) /* SPP control port */ +#define EADD (BASE+3) /* EPP address port */ +#define EDAT (BASE+4) /* EPP data port */ + +/* ----- local functions ---------------------------------------------- */ + +static void pcf_epp_setbyte(void *data, int ctl, int val) +{ + if (ctl) { + if (gpe.pe_irq > 0) { + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write control 0x%x\n", + val|I2C_PCF_ENI)); + // set A0 pin HIGH + outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL); + // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: CTRL port = 0x%x\n", inb(CTRL))); + // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: STAT port = 0x%x\n", inb(STAT))); + + // EPP write data cycle + outb(val | I2C_PCF_ENI, EDAT); + } else { + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write control 0x%x\n", val)); + // set A0 pin HIGH + outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL); + outb(val, CTRL); + } + } else { + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write data 0x%x\n", val)); + // set A0 pin LO + outb(inb(CTRL) & ~PARPORT_CONTROL_INIT, CTRL); + // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: CTRL port = 0x%x\n", inb(CTRL))); + // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: STAT port = 0x%x\n", inb(STAT))); + outb(val, EDAT); + } +} + +static int pcf_epp_getbyte(void *data, int ctl) +{ + int val; + + if (ctl) { + // set A0 pin HIGH + outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL); + val = inb(EDAT); + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Read control 0x%x\n", val)); + } else { + // set A0 pin LOW + outb(inb(CTRL) & ~PARPORT_CONTROL_INIT, CTRL); + val = inb(EDAT); + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Read data 0x%x\n", val)); + } + return (val); +} + +static int pcf_epp_getown(void *data) +{ + return (gpe.pe_own); +} + + +static int pcf_epp_getclock(void *data) +{ + return (gpe.pe_clock); +} + +#if 0 +static void pcf_epp_sleep(unsigned long timeout) +{ + schedule_timeout( timeout * HZ); +} +#endif + +static void pcf_epp_waitforpin(void) { + int timeout = 10; + + if (gpe.pe_irq > 0) { + local_irq_disable(); + if (pcf_pending == 0) { + interruptible_sleep_on_timeout(&pcf_wait, timeout*HZ); + //udelay(100); + } else { + pcf_pending = 0; + } + local_irq_enable(); + } else { + udelay(100); + } +} + +static void pcf_epp_handler(int this_irq, void *dev_id, struct pt_regs *regs) { + pcf_pending = 1; + wake_up_interruptible(&pcf_wait); + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: in interrupt handler.\n")); +} + + +static int pcf_epp_init(void *data) +{ + if (check_region(gpe.pe_base, 5) < 0 ) { + + printk(KERN_WARNING "Could not request port region with base 0x%x\n", gpe.pe_base); + return -ENODEV; + } else { + request_region(gpe.pe_base, 5, "i2c (EPP parallel port adapter)"); + } + + DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: init status port = 0x%x\n", inb(0x379))); + + if (gpe.pe_irq > 0) { + if (request_irq(gpe.pe_irq, pcf_epp_handler, 0, "PCF8584", 0) < 0) { + printk(KERN_NOTICE "i2c-pcf-epp.o: Request irq%d failed\n", gpe.pe_irq); + gpe.pe_irq = 0; + } else + disable_irq(gpe.pe_irq); + enable_irq(gpe.pe_irq); + } + // EPP mode initialize + // enable interrupt from nINTR pin + outb(inb(CTRL)|0x14, CTRL); + // clear ERROR bit of STAT + outb(inb(STAT)|0x01, STAT); + outb(inb(STAT)&~0x01,STAT); + + return 0; +} + + +static void __exit pcf_epp_exit(void) +{ + if (gpe.pe_irq > 0) { + disable_irq(gpe.pe_irq); + free_irq(gpe.pe_irq, 0); + } + release_region(gpe.pe_base , 5); +} + + +static int pcf_epp_reg(struct i2c_client *client) +{ + return 0; +} + + +static int pcf_epp_unreg(struct i2c_client *client) +{ + return 0; +} + +static void pcf_epp_inc_use(struct i2c_adapter *adap) +{ +#ifdef MODULE + MOD_INC_USE_COUNT; +#endif +} + +static void pcf_epp_dec_use(struct i2c_adapter *adap) +{ +#ifdef MODULE + MOD_DEC_USE_COUNT; +#endif +} + + +/* ------------------------------------------------------------------------ + * Encapsulate the above functions in the correct operations structure. + * This is only done when more than one hardware adapter is supported. + */ +static struct i2c_algo_pcf_data pcf_epp_data = { + NULL, + pcf_epp_setbyte, + pcf_epp_getbyte, + pcf_epp_getown, + pcf_epp_getclock, + pcf_epp_waitforpin, + 80, 80, 100, /* waits, timeout */ +}; + +static struct i2c_adapter pcf_epp_ops = { + "PCF8584 EPP adapter", + I2C_HW_P_LP, + NULL, + &pcf_epp_data, + pcf_epp_inc_use, + pcf_epp_dec_use, + pcf_epp_reg, + pcf_epp_unreg, +}; + +int __init i2c_pcfepp_init(void) +{ + struct i2c_pcf_epp *pepp = &gpe; + + printk(KERN_DEBUG "i2c-pcf-epp.o: i2c pcf8584-epp adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE); + if (base == 0) + pepp->pe_base = DEFAULT_BASE; + else + pepp->pe_base = base; + + if (irq == 0) + pepp->pe_irq = DEFAULT_IRQ; + else if (irq<0) { + // switch off irq + pepp->pe_irq=0; + } else { + pepp->pe_irq = irq; + } + if (clock == 0) + pepp->pe_clock = DEFAULT_CLOCK; + else + pepp->pe_clock = clock; + + if (own == 0) + pepp->pe_own = DEFAULT_OWN; + else + pepp->pe_own = own; + + pcf_epp_data.data = (void *)pepp; + init_waitqueue_head(&pcf_wait); + if (pcf_epp_init(pepp) == 0) { + int ret; + if ( (ret = i2c_pcf_add_bus(&pcf_epp_ops)) < 0) { + printk(KERN_WARNING "i2c_pcf_add_bus caused an error: %d\n",ret); + release_region(pepp->pe_base , 5); + return ret; + } + } else { + + return -ENODEV; + } + printk(KERN_DEBUG "i2c-pcf-epp.o: found device at %#x.\n", pepp->pe_base); + return 0; +} + + +#ifdef MODULE +MODULE_AUTHOR("Hans Berglund <hb@spacetec.no> \n modified by Ryosuke Tajima <rosk@jsk.t.u-tokyo.ac.jp>"); +MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 EPP parallel port adapter"); + +MODULE_PARM(base, "i"); +MODULE_PARM(irq, "i"); +MODULE_PARM(clock, "i"); +MODULE_PARM(own, "i"); +MODULE_PARM(i2c_debug, "i"); + +int init_module(void) +{ + return i2c_pcfepp_init(); +} + +void cleanup_module(void) +{ + i2c_pcf_del_bus(&pcf_epp_ops); + pcf_epp_exit(); +} + +#endif + + |  |