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Mark D. Studebaker
0f608515e2
Subject:
Uptodate i2c-keywest
Date:
Sun, 17 Feb 2002 21:34:44 +0100
From:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Here's a patch against current lmsensors CVS which updates i2c-keywest
to the latest version needed on powermac. It's already in Marcelo as
one of the 2.4.18-pre's.
You may note that the i2c "mode" isn't what it should be to match
exactly what linux-i2c expects (see explaining comment). I will have
to define new transfer types in order to work around that, but it's
ok to do that now as we use this driver only for the sound chip
for now.
Ben.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1326 7894878c-1315-0410-8ee3-d5d059ff63e0
112 lines
2.2 KiB
C
112 lines
2.2 KiB
C
#ifndef __I2C_KEYWEST_H__
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#define __I2C_KEYWEST_H__
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/* The Tumbler audio equalizer can be really slow sometimes */
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#define POLL_TIMEOUT (2*HZ)
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/* Register indices */
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typedef enum {
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reg_mode = 0,
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reg_control,
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reg_status,
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reg_isr,
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reg_ier,
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reg_addr,
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reg_subaddr,
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reg_data
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} reg_t;
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/* Mode register */
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#define KW_I2C_MODE_100KHZ 0x00
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#define KW_I2C_MODE_50KHZ 0x01
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#define KW_I2C_MODE_25KHZ 0x02
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#define KW_I2C_MODE_DUMB 0x00
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#define KW_I2C_MODE_STANDARD 0x04
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#define KW_I2C_MODE_STANDARDSUB 0x08
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#define KW_I2C_MODE_COMBINED 0x0C
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#define KW_I2C_MODE_MODE_MASK 0x0C
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#define KW_I2C_MODE_CHAN_MASK 0xF0
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/* Control register */
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#define KW_I2C_CTL_AAK 0x01
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#define KW_I2C_CTL_XADDR 0x02
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#define KW_I2C_CTL_STOP 0x04
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#define KW_I2C_CTL_START 0x08
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/* Status register */
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#define KW_I2C_STAT_BUSY 0x01
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#define KW_I2C_STAT_LAST_AAK 0x02
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#define KW_I2C_STAT_LAST_RW 0x04
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#define KW_I2C_STAT_SDA 0x08
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#define KW_I2C_STAT_SCL 0x10
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/* IER & ISR registers */
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#define KW_I2C_IRQ_DATA 0x01
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#define KW_I2C_IRQ_ADDR 0x02
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#define KW_I2C_IRQ_STOP 0x04
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#define KW_I2C_IRQ_START 0x08
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#define KW_I2C_IRQ_MASK 0x0F
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/* Physical interface */
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struct keywest_iface
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{
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unsigned long base;
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unsigned bsteps;
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int irq;
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struct semaphore sem;
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spinlock_t lock;
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struct keywest_chan* channels;
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unsigned chan_count;
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u8 cur_mode;
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char read_write;
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u8* data;
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unsigned datalen;
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int state;
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int result;
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int stopretry;
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struct timer_list timeout_timer;
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struct completion complete;
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struct keywest_iface* next;
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};
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enum {
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state_idle,
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state_addr,
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state_read,
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state_write,
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state_stop,
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state_dead
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};
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/* Channel on an interface */
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struct keywest_chan
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{
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struct i2c_adapter adapter;
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struct keywest_iface* iface;
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unsigned chan_no;
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};
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/* Register access */
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static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg)
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{
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return in_8(((volatile u8 *)iface->base)
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+ (((unsigned)reg) << iface->bsteps));
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}
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static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val)
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{
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out_8(((volatile u8 *)iface->base)
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+ (((unsigned)reg) << iface->bsteps), val);
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(void)__read_reg(iface, reg);
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udelay(10);
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}
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#define write_reg(reg, val) __write_reg(iface, reg, val)
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#define read_reg(reg) __read_reg(iface, reg)
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#endif /* __I2C_KEYWEST_H__ */
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