diff options
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-pca.c')
-rw-r--r-- | drivers/i2c/algos/i2c-algo-pca.c | 126 |
1 files changed, 63 insertions, 63 deletions
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c index 2a16211..e954a20 100644 --- a/drivers/i2c/algos/i2c-algo-pca.c +++ b/drivers/i2c/algos/i2c-algo-pca.c @@ -1,6 +1,7 @@ /* - * i2c-algo-pca.c i2c driver algorithms for PCA9564 adapters + * i2c-algo-pca.c i2c driver algorithms for PCA9564 adapters * Copyright (C) 2004 Arcom Control Systems + * Copyright (C) 2008 Pengutronix * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -21,14 +22,10 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/delay.h> -#include <linux/slab.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/i2c.h> #include <linux/i2c-algo-pca.h> -#include "i2c-algo-pca.h" - -#define DRIVER "i2c-algo-pca" #define DEB1(fmt, args...) do { if (i2c_debug>=1) printk(fmt, ## args); } while(0) #define DEB2(fmt, args...) do { if (i2c_debug>=2) printk(fmt, ## args); } while(0) @@ -36,15 +33,15 @@ static int i2c_debug; -#define pca_outw(adap, reg, val) adap->write_byte(adap, reg, val) -#define pca_inw(adap, reg) adap->read_byte(adap, reg) +#define pca_outw(adap, reg, val) adap->write_byte(adap->data, reg, val) +#define pca_inw(adap, reg) adap->read_byte(adap->data, reg) #define pca_status(adap) pca_inw(adap, I2C_PCA_STA) -#define pca_clock(adap) adap->get_clock(adap) -#define pca_own(adap) adap->get_own(adap) +#define pca_clock(adap) adap->i2c_clock #define pca_set_con(adap, val) pca_outw(adap, I2C_PCA_CON, val) #define pca_get_con(adap) pca_inw(adap, I2C_PCA_CON) -#define pca_wait(adap) adap->wait_for_interrupt(adap) +#define pca_wait(adap) adap->wait_for_completion(adap->data) +#define pca_reset(adap) adap->reset_chip(adap->data) /* * Generate a start condition on the i2c bus. @@ -99,7 +96,7 @@ static void pca_stop(struct i2c_algo_pca_data *adap) * * returns after the address has been sent */ -static void pca_address(struct i2c_algo_pca_data *adap, +static void pca_address(struct i2c_algo_pca_data *adap, struct i2c_msg *msg) { int sta = pca_get_con(adap); @@ -108,9 +105,9 @@ static void pca_address(struct i2c_algo_pca_data *adap, addr = ( (0x7f & msg->addr) << 1 ); if (msg->flags & I2C_M_RD ) addr |= 1; - DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n", + DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n", msg->addr, msg->flags & I2C_M_RD ? 'R' : 'W', addr); - + pca_outw(adap, I2C_PCA_DAT, addr); sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI); @@ -124,7 +121,7 @@ static void pca_address(struct i2c_algo_pca_data *adap, * * Returns after the byte has been transmitted */ -static void pca_tx_byte(struct i2c_algo_pca_data *adap, +static void pca_tx_byte(struct i2c_algo_pca_data *adap, __u8 b) { int sta = pca_get_con(adap); @@ -142,19 +139,19 @@ static void pca_tx_byte(struct i2c_algo_pca_data *adap, * * returns immediately. */ -static void pca_rx_byte(struct i2c_algo_pca_data *adap, +static void pca_rx_byte(struct i2c_algo_pca_data *adap, __u8 *b, int ack) { *b = pca_inw(adap, I2C_PCA_DAT); DEB2("=== READ %#04x %s\n", *b, ack ? "ACK" : "NACK"); } -/* +/* * Setup ACK or NACK for next received byte and wait for it to arrive. * * Returns after next byte has arrived. */ -static void pca_rx_ack(struct i2c_algo_pca_data *adap, +static void pca_rx_ack(struct i2c_algo_pca_data *adap, int ack) { int sta = pca_get_con(adap); @@ -168,15 +165,6 @@ static void pca_rx_ack(struct i2c_algo_pca_data *adap, pca_wait(adap); } -/* - * Reset the i2c bus / SIO - */ -static void pca_reset(struct i2c_algo_pca_data *adap) -{ - /* apparently only an external reset will do it. not a lot can be done */ - printk(KERN_ERR DRIVER ": Haven't figured out how to do a reset yet\n"); -} - static int pca_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) @@ -187,7 +175,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, int numbytes = 0; int state; int ret; - int timeout = 100; + int timeout = i2c_adap->timeout; while ((state = pca_status(adap)) != 0xf8 && timeout--) { msleep(10); @@ -203,14 +191,14 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, for (curmsg = 0; curmsg < num; curmsg++) { int addr, i; msg = &msgs[curmsg]; - + addr = (0x7f & msg->addr) ; - + if (msg->flags & I2C_M_RD ) - printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n", + printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n", curmsg, msg->len, addr, (addr<<1) | 1); else { - printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s", + printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s", curmsg, msg->len, addr, addr<<1, msg->len == 0 ? "" : ", "); for(i=0; i < msg->len; i++) @@ -237,7 +225,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, case 0x10: /* A repeated start condition has been transmitted */ pca_address(adap, msg); break; - + case 0x18: /* SLA+W has been transmitted; ACK has been received */ case 0x28: /* Data byte in I2CDAT has been transmitted; ACK has been received */ if (numbytes < msg->len) { @@ -287,7 +275,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */ DEB2("Arbitration lost\n"); goto out; - + case 0x58: /* Data byte has been received; NOT ACK has been returned */ if ( numbytes == msg->len - 1 ) { pca_rx_byte(adap, &msg->buf[numbytes], 0); @@ -317,16 +305,16 @@ static int pca_xfer(struct i2c_adapter *i2c_adap, pca_reset(adap); goto out; default: - printk(KERN_ERR DRIVER ": unhandled SIO state 0x%02x\n", state); + dev_err(&i2c_adap->dev, "unhandled SIO state 0x%02x\n", state); break; } - + } ret = curmsg; out: DEB1(KERN_CRIT "}}} transfered %d/%d messages. " - "status is %#04x. control is %#04x\n", + "status is %#04x. control is %#04x\n", curmsg, num, pca_status(adap), pca_get_con(adap)); return ret; @@ -337,53 +325,65 @@ static u32 pca_func(struct i2c_adapter *adap) return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; } -static int pca_init(struct i2c_algo_pca_data *adap) +static const struct i2c_algorithm pca_algo = { + .master_xfer = pca_xfer, + .functionality = pca_func, +}; + +static int pca_init(struct i2c_adapter *adap) { static int freqs[] = {330,288,217,146,88,59,44,36}; - int own, clock; + int clock; + struct i2c_algo_pca_data *pca_data = adap->algo_data; + + if (pca_data->i2c_clock > 7) { + printk(KERN_WARNING "%s: Invalid I2C clock speed selected. Trying default.\n", + adap->name); + pca_data->i2c_clock = I2C_PCA_CON_59kHz; + } + + adap->algo = &pca_algo; - own = pca_own(adap); - clock = pca_clock(adap); - DEB1(KERN_INFO DRIVER ": own address is %#04x\n", own); - DEB1(KERN_INFO DRIVER ": clock freqeuncy is %dkHz\n", freqs[clock]); + pca_reset(pca_data); - pca_outw(adap, I2C_PCA_ADR, own << 1); + clock = pca_clock(pca_data); + DEB1(KERN_INFO "%s: Clock frequency is %dkHz\n", adap->name, freqs[clock]); - pca_set_con(adap, I2C_PCA_CON_ENSIO | clock); - udelay(500); /* 500 µs for oscilator to stabilise */ + pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock); + udelay(500); /* 500 us for oscilator to stabilise */ return 0; } -static const struct i2c_algorithm pca_algo = { - .master_xfer = pca_xfer, - .functionality = pca_func, -}; - -/* - * registering functions to load algorithms at runtime +/* + * registering functions to load algorithms at runtime */ int i2c_pca_add_bus(struct i2c_adapter *adap) { - struct i2c_algo_pca_data *pca_adap = adap->algo_data; int rval; - /* register new adapter to i2c module... */ - adap->algo = &pca_algo; + rval = pca_init(adap); + if (rval) + return rval; - adap->timeout = 100; /* default values, should */ - adap->retries = 3; /* be replaced by defines */ + return i2c_add_adapter(adap); +} +EXPORT_SYMBOL(i2c_pca_add_bus); - if ((rval = pca_init(pca_adap))) - return rval; +int i2c_pca_add_numbered_bus(struct i2c_adapter *adap) +{ + int rval; - rval = i2c_add_adapter(adap); + rval = pca_init(adap); + if (rval) + return rval; - return rval; + return i2c_add_numbered_adapter(adap); } -EXPORT_SYMBOL(i2c_pca_add_bus); +EXPORT_SYMBOL(i2c_pca_add_numbered_bus); -MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); +MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>, " + "Wolfram Sang <w.sang@pengutronix.de>"); MODULE_DESCRIPTION("I2C-Bus PCA9564 algorithm"); MODULE_LICENSE("GPL"); |