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Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pca.c')
-rw-r--r--ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pca.c566
1 files changed, 0 insertions, 566 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pca.c b/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pca.c
deleted file mode 100644
index 73133b10..00000000
--- a/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pca.c
+++ /dev/null
@@ -1,566 +0,0 @@
-/*
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/delay.h>
-#include <linux/jiffies.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-pca.h>
-
-#define DEB1(fmt, args...) do { if (i2c_debug >= 1) \
- printk(KERN_DEBUG fmt, ## args); } while (0)
-#define DEB2(fmt, args...) do { if (i2c_debug >= 2) \
- printk(KERN_DEBUG fmt, ## args); } while (0)
-#define DEB3(fmt, args...) do { if (i2c_debug >= 3) \
- printk(KERN_DEBUG fmt, ## args); } while (0)
-
-static int i2c_debug;
-
-#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->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_completion(adap->data)
-#define pca_reset(adap) adap->reset_chip(adap->data)
-
-static void pca9665_reset(void *pd)
-{
- struct i2c_algo_pca_data *adap = pd;
- pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IPRESET);
- pca_outw(adap, I2C_PCA_IND, 0xA5);
- pca_outw(adap, I2C_PCA_IND, 0x5A);
-}
-
-/*
- * Generate a start condition on the i2c bus.
- *
- * returns after the start condition has occurred
- */
-static int pca_start(struct i2c_algo_pca_data *adap)
-{
- int sta = pca_get_con(adap);
- DEB2("=== START\n");
- sta |= I2C_PCA_CON_STA;
- sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
- pca_set_con(adap, sta);
- return pca_wait(adap);
-}
-
-/*
- * Generate a repeated start condition on the i2c bus
- *
- * return after the repeated start condition has occurred
- */
-static int pca_repeated_start(struct i2c_algo_pca_data *adap)
-{
- int sta = pca_get_con(adap);
- DEB2("=== REPEATED START\n");
- sta |= I2C_PCA_CON_STA;
- sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
- pca_set_con(adap, sta);
- return pca_wait(adap);
-}
-
-/*
- * Generate a stop condition on the i2c bus
- *
- * returns after the stop condition has been generated
- *
- * STOPs do not generate an interrupt or set the SI flag, since the
- * part returns the idle state (0xf8). Hence we don't need to
- * pca_wait here.
- */
-static void pca_stop(struct i2c_algo_pca_data *adap)
-{
- int sta = pca_get_con(adap);
- DEB2("=== STOP\n");
- sta |= I2C_PCA_CON_STO;
- sta &= ~(I2C_PCA_CON_STA|I2C_PCA_CON_SI);
- pca_set_con(adap, sta);
-}
-
-/*
- * Send the slave address and R/W bit
- *
- * returns after the address has been sent
- */
-static int pca_address(struct i2c_algo_pca_data *adap,
- struct i2c_msg *msg)
-{
- int sta = pca_get_con(adap);
- int addr;
-
- addr = ((0x7f & msg->addr) << 1);
- if (msg->flags & I2C_M_RD)
- addr |= 1;
- 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);
- pca_set_con(adap, sta);
-
- return pca_wait(adap);
-}
-
-/*
- * Transmit a byte.
- *
- * Returns after the byte has been transmitted
- */
-static int pca_tx_byte(struct i2c_algo_pca_data *adap,
- __u8 b)
-{
- int sta = pca_get_con(adap);
- DEB2("=== WRITE %#04x\n", b);
- pca_outw(adap, I2C_PCA_DAT, b);
-
- sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI);
- pca_set_con(adap, sta);
-
- return pca_wait(adap);
-}
-
-/*
- * Receive a byte
- *
- * returns immediately.
- */
-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 int pca_rx_ack(struct i2c_algo_pca_data *adap,
- int ack)
-{
- int sta = pca_get_con(adap);
-
- sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI|I2C_PCA_CON_AA);
-
- if (ack)
- sta |= I2C_PCA_CON_AA;
-
- pca_set_con(adap, sta);
- return pca_wait(adap);
-}
-
-static int pca_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs,
- int num)
-{
- struct i2c_algo_pca_data *adap = i2c_adap->algo_data;
- struct i2c_msg *msg = NULL;
- int curmsg;
- int numbytes = 0;
- int state;
- int ret;
- int completed = 1;
- unsigned long timeout = jiffies + i2c_adap->timeout;
-
- while ((state = pca_status(adap)) != 0xf8) {
- if (time_before(jiffies, timeout)) {
- msleep(10);
- } else {
- dev_dbg(&i2c_adap->dev, "bus is not idle. status is "
- "%#04x\n", state);
- return -EBUSY;
- }
- }
-
- DEB1("{{{ XFER %d messages\n", num);
-
- if (i2c_debug >= 2) {
- 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",
- curmsg, msg->len, addr, (addr << 1) | 1);
- else {
- 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++)
- printk("%#04x%s", msg->buf[i], i == msg->len - 1 ? "" : ", ");
- printk("]\n");
- }
- }
- }
-
- curmsg = 0;
- ret = -EIO;
- while (curmsg < num) {
- state = pca_status(adap);
-
- DEB3("STATE is 0x%02x\n", state);
- msg = &msgs[curmsg];
-
- switch (state) {
- case 0xf8: /* On reset or stop the bus is idle */
- completed = pca_start(adap);
- break;
-
- case 0x08: /* A START condition has been transmitted */
- case 0x10: /* A repeated start condition has been transmitted */
- completed = 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) {
- completed = pca_tx_byte(adap,
- msg->buf[numbytes]);
- numbytes++;
- break;
- }
- curmsg++; numbytes = 0;
- if (curmsg == num)
- pca_stop(adap);
- else
- completed = pca_repeated_start(adap);
- break;
-
- case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */
- DEB2("NOT ACK received after SLA+W\n");
- pca_stop(adap);
- ret = -ENXIO;
- goto out;
-
- case 0x40: /* SLA+R has been transmitted; ACK has been received */
- completed = pca_rx_ack(adap, msg->len > 1);
- break;
-
- case 0x50: /* Data bytes has been received; ACK has been returned */
- if (numbytes < msg->len) {
- pca_rx_byte(adap, &msg->buf[numbytes], 1);
- numbytes++;
- completed = pca_rx_ack(adap,
- numbytes < msg->len - 1);
- break;
- }
- curmsg++; numbytes = 0;
- if (curmsg == num)
- pca_stop(adap);
- else
- completed = pca_repeated_start(adap);
- break;
-
- case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */
- DEB2("NOT ACK received after SLA+R\n");
- pca_stop(adap);
- ret = -ENXIO;
- goto out;
-
- case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */
- DEB2("NOT ACK received after data byte\n");
- pca_stop(adap);
- goto out;
-
- case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */
- DEB2("Arbitration lost\n");
- /*
- * The PCA9564 data sheet (2006-09-01) says "A
- * START condition will be transmitted when the
- * bus becomes free (STOP or SCL and SDA high)"
- * when the STA bit is set (p. 11).
- *
- * In case this won't work, try pca_reset()
- * instead.
- */
- pca_start(adap);
- 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);
- curmsg++; numbytes = 0;
- if (curmsg == num)
- pca_stop(adap);
- else
- completed = pca_repeated_start(adap);
- } else {
- DEB2("NOT ACK sent after data byte received. "
- "Not final byte. numbytes %d. len %d\n",
- numbytes, msg->len);
- pca_stop(adap);
- goto out;
- }
- break;
- case 0x70: /* Bus error - SDA stuck low */
- DEB2("BUS ERROR - SDA Stuck low\n");
- pca_reset(adap);
- goto out;
- case 0x90: /* Bus error - SCL stuck low */
- DEB2("BUS ERROR - SCL Stuck low\n");
- pca_reset(adap);
- goto out;
- case 0x00: /* Bus error during master or slave mode due to illegal START or STOP condition */
- DEB2("BUS ERROR - Illegal START or STOP\n");
- pca_reset(adap);
- goto out;
- default:
- dev_err(&i2c_adap->dev, "unhandled SIO state 0x%02x\n", state);
- break;
- }
-
- if (!completed)
- goto out;
- }
-
- ret = curmsg;
- out:
- DEB1("}}} transferred %d/%d messages. "
- "status is %#04x. control is %#04x\n",
- curmsg, num, pca_status(adap),
- pca_get_con(adap));
- return ret;
-}
-
-static u32 pca_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static const struct i2c_algorithm pca_algo = {
- .master_xfer = pca_xfer,
- .functionality = pca_func,
-};
-
-static unsigned int pca_probe_chip(struct i2c_adapter *adap)
-{
- struct i2c_algo_pca_data *pca_data = adap->algo_data;
- /* The trick here is to check if there is an indirect register
- * available. If there is one, we will read the value we first
- * wrote on I2C_PCA_IADR. Otherwise, we will read the last value
- * we wrote on I2C_PCA_ADR
- */
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
- pca_outw(pca_data, I2C_PCA_IND, 0xAA);
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ITO);
- pca_outw(pca_data, I2C_PCA_IND, 0x00);
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
- if (pca_inw(pca_data, I2C_PCA_IND) == 0xAA) {
- printk(KERN_INFO "%s: PCA9665 detected.\n", adap->name);
- return I2C_PCA_CHIP_9665;
- } else {
- printk(KERN_INFO "%s: PCA9564 detected.\n", adap->name);
- return I2C_PCA_CHIP_9564;
- }
-}
-
-static int pca_init(struct i2c_adapter *adap)
-{
- struct i2c_algo_pca_data *pca_data = adap->algo_data;
-
- adap->algo = &pca_algo;
-
- if (pca_probe_chip(adap) == I2C_PCA_CHIP_9564) {
- static int freqs[] = {330, 288, 217, 146, 88, 59, 44, 36};
- int clock;
-
- if (pca_data->i2c_clock > 7) {
- switch (pca_data->i2c_clock) {
- case 330000:
- pca_data->i2c_clock = I2C_PCA_CON_330kHz;
- break;
- case 288000:
- pca_data->i2c_clock = I2C_PCA_CON_288kHz;
- break;
- case 217000:
- pca_data->i2c_clock = I2C_PCA_CON_217kHz;
- break;
- case 146000:
- pca_data->i2c_clock = I2C_PCA_CON_146kHz;
- break;
- case 88000:
- pca_data->i2c_clock = I2C_PCA_CON_88kHz;
- break;
- case 59000:
- pca_data->i2c_clock = I2C_PCA_CON_59kHz;
- break;
- case 44000:
- pca_data->i2c_clock = I2C_PCA_CON_44kHz;
- break;
- case 36000:
- pca_data->i2c_clock = I2C_PCA_CON_36kHz;
- break;
- default:
- printk(KERN_WARNING
- "%s: Invalid I2C clock speed selected."
- " Using default 59kHz.\n", adap->name);
- pca_data->i2c_clock = I2C_PCA_CON_59kHz;
- }
- } else {
- printk(KERN_WARNING "%s: "
- "Choosing the clock frequency based on "
- "index is deprecated."
- " Use the nominal frequency.\n", adap->name);
- }
-
- pca_reset(pca_data);
-
- clock = pca_clock(pca_data);
- printk(KERN_INFO "%s: Clock frequency is %dkHz\n",
- adap->name, freqs[clock]);
-
- pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
- } else {
- int clock;
- int mode;
- int tlow, thi;
- /* Values can be found on PCA9665 datasheet section 7.3.2.6 */
- int min_tlow, min_thi;
- /* These values are the maximum raise and fall values allowed
- * by the I2C operation mode (Standard, Fast or Fast+)
- * They are used (added) below to calculate the clock dividers
- * of PCA9665. Note that they are slightly different of the
- * real maximum, to allow the change on mode exactly on the
- * maximum clock rate for each mode
- */
- int raise_fall_time;
-
- /* Ignore the reset function from the module,
- * we can use the parallel bus reset
- */
- pca_data->reset_chip = pca9665_reset;
-
- if (pca_data->i2c_clock > 1265800) {
- printk(KERN_WARNING "%s: I2C clock speed too high."
- " Using 1265.8kHz.\n", adap->name);
- pca_data->i2c_clock = 1265800;
- }
-
- if (pca_data->i2c_clock < 60300) {
- printk(KERN_WARNING "%s: I2C clock speed too low."
- " Using 60.3kHz.\n", adap->name);
- pca_data->i2c_clock = 60300;
- }
-
- /* To avoid integer overflow, use clock/100 for calculations */
- clock = pca_clock(pca_data) / 100;
-
- if (pca_data->i2c_clock > 10000) {
- mode = I2C_PCA_MODE_TURBO;
- min_tlow = 14;
- min_thi = 5;
- raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
- } else if (pca_data->i2c_clock > 4000) {
- mode = I2C_PCA_MODE_FASTP;
- min_tlow = 17;
- min_thi = 9;
- raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
- } else if (pca_data->i2c_clock > 1000) {
- mode = I2C_PCA_MODE_FAST;
- min_tlow = 44;
- min_thi = 20;
- raise_fall_time = 58; /* Raise 29e-8s, Fall 29e-8s */
- } else {
- mode = I2C_PCA_MODE_STD;
- min_tlow = 157;
- min_thi = 134;
- raise_fall_time = 127; /* Raise 29e-8s, Fall 98e-8s */
- }
-
- /* The minimum clock that respects the thi/tlow = 134/157 is
- * 64800 Hz. Below that, we have to fix the tlow to 255 and
- * calculate the thi factor.
- */
- if (clock < 648) {
- tlow = 255;
- thi = 1000000 - clock * raise_fall_time;
- thi /= (I2C_PCA_OSC_PER * clock) - tlow;
- } else {
- tlow = (1000000 - clock * raise_fall_time) * min_tlow;
- tlow /= I2C_PCA_OSC_PER * clock * (min_thi + min_tlow);
- thi = tlow * min_thi / min_tlow;
- }
-
- pca_reset(pca_data);
-
- printk(KERN_INFO
- "%s: Clock frequency is %dHz\n", adap->name, clock * 100);
-
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE);
- pca_outw(pca_data, I2C_PCA_IND, mode);
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
- pca_outw(pca_data, I2C_PCA_IND, tlow);
- pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
- pca_outw(pca_data, I2C_PCA_IND, thi);
-
- pca_set_con(pca_data, I2C_PCA_CON_ENSIO);
- }
- udelay(500); /* 500 us for oscilator to stabilise */
-
- return 0;
-}
-
-/*
- * registering functions to load algorithms at runtime
- */
-int i2c_pca_add_bus(struct i2c_adapter *adap)
-{
- int rval;
-
- rval = pca_init(adap);
- if (rval)
- return rval;
-
- return i2c_add_adapter(adap);
-}
-EXPORT_SYMBOL(i2c_pca_add_bus);
-
-int i2c_pca_add_numbered_bus(struct i2c_adapter *adap)
-{
- int rval;
-
- rval = pca_init(adap);
- if (rval)
- return rval;
-
- return i2c_add_numbered_adapter(adap);
-}
-EXPORT_SYMBOL(i2c_pca_add_numbered_bus);
-
-MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>, "
- "Wolfram Sang <w.sang@pengutronix.de>");
-MODULE_DESCRIPTION("I2C-Bus PCA9564/PCA9665 algorithm");
-MODULE_LICENSE("GPL");
-
-module_param(i2c_debug, int, 0);
generated by cgit (git 2.34.1) at 2025-03-30 19:52:35 +0000