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Diffstat (limited to 'v4l_experimental/pvrusb2/pvrusb2-i2c-core.c')
-rw-r--r--v4l_experimental/pvrusb2/pvrusb2-i2c-core.c737
1 files changed, 737 insertions, 0 deletions
diff --git a/v4l_experimental/pvrusb2/pvrusb2-i2c-core.c b/v4l_experimental/pvrusb2/pvrusb2-i2c-core.c
new file mode 100644
index 000000000..8375ca7af
--- /dev/null
+++ b/v4l_experimental/pvrusb2/pvrusb2-i2c-core.c
@@ -0,0 +1,737 @@
+/*
+ *
+ * $Id: pvrusb2-i2c-core.c,v 1.1 2006/01/01 08:26:03 mcisely Exp $
+ *
+ * Copyright (C) 2005 Mike Isely <isely@pobox.com>
+ *
+ * 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
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "compat.h"
+#include "pvrusb2-i2c-core.h"
+#include "pvrusb2-hdw-internal.h"
+#include "pvrusb2-debug.h"
+
+#define trace_i2c(...) pvr2_trace(PVR2_TRACE_I2C,__VA_ARGS__)
+
+/*
+
+ This module attempts to implement a compliant I2C adapter for the pvrusb2
+ device. By doing this we can then make use of existing functionality in
+ V4L (e.g. tuner.c) rather than rolling our own.
+
+*/
+
+static unsigned int i2c_scan = 0;
+module_param(i2c_scan, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+static int pvr2_i2c_write(struct pvr2_hdw *hdw, /* Context */
+ u8 i2c_addr, /* I2C address we're talking to */
+ u8 *data, /* Data to write */
+ u16 length) /* Size of data to write */
+{
+ /* Return value - default 0 means success */
+ int ret;
+
+#ifdef notdef
+ trace_i2c("pvr2_i2c_write");
+#endif
+
+ if (!data) length = 0;
+ if (length > (sizeof(hdw->cmd_buffer) - 3)) return -ENOTSUPP;
+
+ LOCK_TAKE(hdw->ctl_lock);
+
+ /* Clear the command buffer (likely to be paranoia) */
+ memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));
+
+ /* Set up command buffer for an I2C write */
+ hdw->cmd_buffer[0] = 0x08; /* write prefix */
+ hdw->cmd_buffer[1] = i2c_addr; /* i2c addr of chip */
+ hdw->cmd_buffer[2] = length; /* length of what follows */
+ if (length) memcpy(hdw->cmd_buffer + 3, data, length);
+
+ /* Do the operation */
+ ret = pvr2_send_request(hdw,
+ hdw->cmd_buffer,
+ length + 3,
+ hdw->cmd_buffer,
+ 1);
+ if (!ret) {
+ if (hdw->cmd_buffer[0] != 8) {
+ ret = -EIO;
+ if (hdw->cmd_buffer[0] != 7) {
+ trace_i2c("unexpected status"
+ " from i2_write[%d]: %d",
+ i2c_addr,hdw->cmd_buffer[0]);
+ }
+ }
+ }
+#ifdef notdef
+ trace_i2c("i2c_write(%d) len=%d ret=%d stat=%d",i2c_addr,length,ret,
+ hdw->cmd_buffer[0]);
+#endif
+
+ LOCK_GIVE(hdw->ctl_lock);
+
+ return ret;
+}
+
+static int pvr2_i2c_read(struct pvr2_hdw *hdw, /* Context */
+ u8 i2c_addr, /* I2C address we're talking to */
+ u8 *data, /* Data to write */
+ u16 dlen, /* Size of data to write */
+ u8 *res, /* Where to put data we read */
+ u16 rlen) /* Amount of data to read */
+{
+ /* Return value - default 0 means success */
+ int ret;
+
+#ifdef notdef
+ trace_i2c("pvr2_i2c_read");
+#endif
+
+ if (!data) dlen = 0;
+ if (dlen > (sizeof(hdw->cmd_buffer) - 4)) return -ENOTSUPP;
+ if (res && (rlen > (sizeof(hdw->cmd_buffer) - 1))) return -ENOTSUPP;
+
+ LOCK_TAKE(hdw->ctl_lock);
+
+ /* Clear the command buffer (likely to be paranoia) */
+ memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));
+
+ /* Set up command buffer for an I2C write followed by a read */
+ hdw->cmd_buffer[0] = 0x09; /* read prefix */
+ hdw->cmd_buffer[1] = dlen; /* arg length */
+ hdw->cmd_buffer[2] = rlen; /* answer length. Device will send one
+ more byte (status). */
+ hdw->cmd_buffer[3] = i2c_addr; /* i2c addr of chip */
+ if (dlen) memcpy(hdw->cmd_buffer + 4, data, dlen);
+
+ /* Do the operation */
+ ret = pvr2_send_request(hdw,
+ hdw->cmd_buffer,
+ 4 + dlen,
+ hdw->cmd_buffer,
+ rlen + 1);
+ if (!ret) {
+ if (hdw->cmd_buffer[0] != 8) {
+ ret = -EIO;
+ if (hdw->cmd_buffer[0] != 7) {
+ trace_i2c("unexpected status"
+ " from i2_read[%d]: %d",
+ i2c_addr,hdw->cmd_buffer[0]);
+ }
+ }
+ }
+
+#ifdef notdef
+ trace_i2c("i2c_read(%d) wlen=%d rlen=%d ret=%d stat=%d",
+ i2c_addr,dlen,rlen,ret,hdw->cmd_buffer[0]);
+#endif
+ /* Copy back the result */
+ if (res && rlen) {
+ if (ret) {
+ /* Error, just blank out the return buffer */
+ memset(res, 0, rlen);
+ } else {
+ memcpy(res, hdw->cmd_buffer + 1, rlen);
+ }
+ }
+
+ LOCK_GIVE(hdw->ctl_lock);
+
+ return ret;
+}
+
+/* This is a very, very limited I2C adapter implementation. We can only
+ support what we actually know will work on the device... */
+static int pvr2_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[],
+ int num)
+{
+ int ret = -ENOTSUPP;
+ struct pvr2_hdw *hdw = (struct pvr2_hdw *)(i2c_adap->algo_data);
+
+ if ((msgs[0].flags & I2C_M_NOSTART)) {
+ trace_i2c("i2c refusing I2C_M_NOSTART");
+ goto done;
+ }
+
+ if (num == 1) {
+ if (msgs[0].flags & I2C_M_RD) {
+ /* Simple read */
+ u16 tcnt,bcnt,offs;
+ if (!msgs[0].len) {
+ /* Length == 0 read. This is a probe. */
+ if (pvr2_i2c_read(hdw,msgs[0].addr,
+ 0,0,0,0)) {
+ ret = -EIO;
+ goto done;
+ }
+ ret = 1;
+ goto done;
+ }
+ /* If the read is short enough we'll do the whole
+ thing atomically. Otherwise we have no choice
+ but to break apart the reads. */
+ tcnt = msgs[0].len;
+ offs = 0;
+ while (tcnt) {
+ bcnt = tcnt;
+ if (bcnt > sizeof(hdw->cmd_buffer)-1) {
+ bcnt = sizeof(hdw->cmd_buffer)-1;
+ }
+ if (pvr2_i2c_read(hdw,msgs[0].addr,
+ 0,0,
+ msgs[0].buf+offs,bcnt)) {
+ ret = -EIO;
+ goto done;
+ }
+ offs += bcnt;
+ tcnt -= bcnt;
+ }
+ ret = 1;
+ goto done;
+ } else {
+ /* Simple write */
+ ret = 1;
+ if (pvr2_i2c_write(hdw,msgs[0].addr,
+ msgs[0].buf,msgs[0].len)) {
+ ret = -EIO;
+ }
+ goto done;
+ }
+ } else if (num == 2) {
+ if ((!((msgs[0].flags & I2C_M_RD))) &&
+ (msgs[1].flags & I2C_M_RD)) {
+ u16 tcnt,bcnt,wcnt,offs;
+ /* Write followed by atomic read. If the read
+ portion is short enough we'll do the whole thing
+ atomically. Otherwise we have no choice but to
+ break apart the reads. */
+ tcnt = msgs[1].len;
+ wcnt = msgs[0].len;
+ offs = 0;
+ while (tcnt || wcnt) {
+ bcnt = tcnt;
+ if (bcnt > sizeof(hdw->cmd_buffer)-1) {
+ bcnt = sizeof(hdw->cmd_buffer)-1;
+ }
+ if (pvr2_i2c_read(hdw,msgs[0].addr,
+ msgs[0].buf,wcnt,
+ msgs[1].buf+offs,bcnt)) {
+ ret = -EIO;
+ goto done;
+ }
+ offs += bcnt;
+ tcnt -= bcnt;
+ wcnt = 0;
+ }
+ ret = 2;
+ goto done;
+ } else {
+ trace_i2c("i2c refusing complex transfer"
+ " read0=%d read1=%d",
+ (msgs[0].flags & I2C_M_RD),
+ (msgs[1].flags & I2C_M_RD));
+ }
+ } else {
+ trace_i2c("i2c refusing %d phase transfer",num);
+ }
+
+ done:
+ return ret;
+}
+
+static int pvr2_i2c_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+static u32 pvr2_i2c_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static int pvr2_i2c_core_singleton(struct i2c_client *cp,
+ unsigned int cmd,void *arg)
+{
+ int stat;
+ if (!cp) return -EINVAL;
+ if (!(cp->driver)) return -EINVAL;
+ if (!(cp->driver->command)) return -EINVAL;
+ if (!try_module_get(cp->driver->owner)) return -EAGAIN;
+ stat = cp->driver->command(cp,cmd,arg);
+ module_put(cp->driver->owner);
+ return stat;
+}
+
+int pvr2_i2c_client_cmd(struct pvr2_i2c_client *cp,unsigned int cmd,void *arg)
+{
+ if (debug & PVR2_TRACE_I2C_CMD) {
+ char buf[100];
+ unsigned int cnt;
+ cnt = pvr2_i2c_client_describe(cp,PVR2_I2C_DETAIL_DEBUG,
+ buf,sizeof(buf));
+ pvr2_trace(PVR2_TRACE_I2C_CMD,
+ "i2c COMMAND to %.*s",cnt,buf);
+ }
+ return pvr2_i2c_core_singleton(cp->client,cmd,arg);
+}
+
+int pvr2_i2c_core_cmd(struct pvr2_hdw *hdw,unsigned int cmd,void *arg)
+{
+ struct list_head *item,*nc;
+ struct pvr2_i2c_client *cp;
+ int stat = -EINVAL;
+
+ if (!hdw) return stat;
+
+ down(&hdw->i2c_list_lock);
+ list_for_each_safe(item,nc,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,list);
+ if (!cp->recv_enable) continue;
+ up(&hdw->i2c_list_lock);
+ stat = pvr2_i2c_client_cmd(cp,cmd,arg);
+ down(&hdw->i2c_list_lock);
+ }
+ up(&hdw->i2c_list_lock);
+ return stat;
+}
+
+
+static int handler_check(struct pvr2_i2c_client *cp)
+{
+ struct pvr2_i2c_handler *hp = cp->handler;
+ if (!hp) return 0;
+ if (!hp->func_table->check) return 0;
+ return hp->func_table->check(hp->func_data) != 0;
+}
+
+#define BUFSIZE 500
+
+void pvr2_i2c_core_sync(struct pvr2_hdw *hdw)
+{
+ unsigned long msk;
+ unsigned int idx;
+ struct list_head *item,*nc;
+ struct pvr2_i2c_client *cp;
+
+ if (!hdw->i2c_linked) return;
+ if (!(hdw->i2c_pend_types & PVR2_I2C_PEND_ALL)) {
+ return;
+ }
+ down(&hdw->i2c_list_lock); do {
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: core_sync BEGIN");
+ if (hdw->i2c_pend_types & PVR2_I2C_PEND_DETECT) {
+ /* One or more I2C clients have attached since we
+ last synced. So scan the list and identify the
+ new clients. */
+ char *buf;
+ unsigned int cnt;
+ unsigned long amask = 0;
+ buf = kmalloc(BUFSIZE,GFP_KERNEL);
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_DETECT");
+ hdw->i2c_pend_types &= ~PVR2_I2C_PEND_DETECT;
+ list_for_each(item,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,
+ list);
+ if (!cp->detected_flag) {
+ cp->ctl_mask = 0;
+ pvr2_i2c_probe(hdw,cp);
+ cp->detected_flag = !0;
+ msk = cp->ctl_mask;
+ cnt = 0;
+ if (buf) {
+ cnt = pvr2_i2c_client_describe(
+ cp,
+ PVR2_I2C_DETAIL_ALL,
+ buf,BUFSIZE);
+ }
+ trace_i2c("Probed: %.*s",cnt,buf);
+ if (handler_check(cp)) {
+ hdw->i2c_pend_types |=
+ PVR2_I2C_PEND_CLIENT;
+ }
+ cp->pend_mask = msk;
+ hdw->i2c_pend_mask |= msk;
+ hdw->i2c_pend_types |=
+ PVR2_I2C_PEND_REFRESH;
+ }
+ amask |= cp->ctl_mask;
+ }
+ hdw->i2c_active_mask = amask;
+ if (buf) kfree(buf);
+ }
+ if (hdw->i2c_pend_types & PVR2_I2C_PEND_STALE) {
+ /* Need to do one or more global updates. Arrange
+ for this to happen. */
+ unsigned long m2;
+ pvr2_trace(PVR2_TRACE_I2C_CORE,
+ "i2c: PEND_STALE (0x%lx)",
+ hdw->i2c_stale_mask);
+ hdw->i2c_pend_types &= ~PVR2_I2C_PEND_STALE;
+ list_for_each(item,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,
+ list);
+ m2 = hdw->i2c_stale_mask;
+ m2 &= cp->ctl_mask;
+ m2 &= ~cp->pend_mask;
+ if (m2) {
+ pvr2_trace(PVR2_TRACE_I2C_CORE,
+ "i2c: cp=%p setting 0x%lx",
+ cp,m2);
+ cp->pend_mask |= m2;
+ }
+ }
+ hdw->i2c_pend_mask |= hdw->i2c_stale_mask;
+ hdw->i2c_stale_mask = 0;
+ hdw->i2c_pend_types |= PVR2_I2C_PEND_REFRESH;
+ }
+ if (hdw->i2c_pend_types & PVR2_I2C_PEND_CLIENT) {
+ /* One or more client handlers are asking for an
+ update. Run through the list of known clients
+ and update each one. */
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_CLIENT");
+ hdw->i2c_pend_types &= ~PVR2_I2C_PEND_CLIENT;
+ list_for_each_safe(item,nc,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,
+ list);
+ if (!cp->handler) continue;
+ if (!cp->handler->func_table->update) continue;
+ pvr2_trace(PVR2_TRACE_I2C_CORE,
+ "i2c: cp=%p update",cp);
+ up(&hdw->i2c_list_lock);
+ cp->handler->func_table->update(
+ cp->handler->func_data);
+ down(&hdw->i2c_list_lock);
+ /* If client's update function set some
+ additional pending bits, account for that
+ here. */
+ if (cp->pend_mask & ~hdw->i2c_pend_mask) {
+ hdw->i2c_pend_mask |= cp->pend_mask;
+ hdw->i2c_pend_types |=
+ PVR2_I2C_PEND_REFRESH;
+ }
+ }
+ }
+ if (hdw->i2c_pend_types & PVR2_I2C_PEND_REFRESH) {
+ const struct pvr2_i2c_op *opf;
+ unsigned long pm;
+ /* Some actual updates are pending. Walk through
+ each update type and perform it. */
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_REFRESH"
+ " (0x%lx)",hdw->i2c_pend_mask);
+ hdw->i2c_pend_types &= ~PVR2_I2C_PEND_REFRESH;
+ pm = hdw->i2c_pend_mask;
+ hdw->i2c_pend_mask = 0;
+ for (idx = 0, msk = 1; pm; idx++, msk <<= 1) {
+ if (!(pm & msk)) continue;
+ pm &= ~msk;
+ list_for_each(item,&hdw->i2c_clients) {
+ cp = list_entry(item,
+ struct pvr2_i2c_client,
+ list);
+ if (cp->pend_mask & msk) {
+ cp->pend_mask &= ~msk;
+ cp->recv_enable = !0;
+ } else {
+ cp->recv_enable = 0;
+ }
+ }
+ opf = pvr2_i2c_get_op(idx);
+ if (!opf) continue;
+ up(&hdw->i2c_list_lock);
+ opf->update(hdw);
+ down(&hdw->i2c_list_lock);
+ }
+ }
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: core_sync END");
+ } while (0); up(&hdw->i2c_list_lock);
+}
+
+int pvr2_i2c_core_check_stale(struct pvr2_hdw *hdw)
+{
+ unsigned long msk,sm,pm;
+ unsigned int idx;
+ const struct pvr2_i2c_op *opf;
+ struct list_head *item;
+ struct pvr2_i2c_client *cp;
+ unsigned int pt = 0;
+
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"pvr2_i2c_core_check_stale BEGIN");
+
+ pm = hdw->i2c_active_mask;
+ sm = 0;
+ for (idx = 0, msk = 1; pm; idx++, msk <<= 1) {
+ if (!(msk & pm)) continue;
+ pm &= ~msk;
+ opf = pvr2_i2c_get_op(idx);
+ if (!opf) continue;
+ if (opf->check(hdw)) {
+ sm |= msk;
+ }
+ }
+ if (sm) pt |= PVR2_I2C_PEND_STALE;
+
+ list_for_each(item,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,list);
+ if (!handler_check(cp)) continue;
+ pt |= PVR2_I2C_PEND_CLIENT;
+ }
+
+ if (pt) {
+ down(&hdw->i2c_list_lock); do {
+ hdw->i2c_pend_types |= pt;
+ hdw->i2c_stale_mask |= sm;
+ hdw->i2c_pend_mask |= hdw->i2c_stale_mask;
+ } while (0); up(&hdw->i2c_list_lock);
+ }
+
+ pvr2_trace(PVR2_TRACE_I2C_CORE,
+ "i2c: types=0x%x stale=0x%lx pend=0x%lx",
+ hdw->i2c_pend_types,
+ hdw->i2c_stale_mask,
+ hdw->i2c_pend_mask);
+ pvr2_trace(PVR2_TRACE_I2C_CORE,"pvr2_i2c_core_check_stale END");
+
+ return (hdw->i2c_pend_types & PVR2_I2C_PEND_ALL) != 0;
+}
+
+unsigned int pvr2_i2c_client_describe(struct pvr2_i2c_client *cp,
+ unsigned int detail,
+ char *buf,unsigned int maxlen)
+{
+ unsigned int ccnt,bcnt;
+ int spcfl = 0;
+ const struct pvr2_i2c_op *opf;
+
+ ccnt = 0;
+ if (detail & PVR2_I2C_DETAIL_DEBUG) {
+ bcnt = scnprintf(buf,maxlen,
+ "ctxt=%p ctl_mask=0x%lx",
+ cp,cp->ctl_mask);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ spcfl = !0;
+ }
+ bcnt = scnprintf(buf,maxlen,
+ "%s%s @ 0x%x",
+ (spcfl ? " " : ""),
+ cp->client->name,
+ cp->client->addr);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ if ((detail & PVR2_I2C_DETAIL_HANDLER) &&
+ cp->handler && cp->handler->func_table->describe) {
+ bcnt = scnprintf(buf,maxlen," (");
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ bcnt = cp->handler->func_table->describe(
+ cp->handler->func_data,buf,maxlen);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ bcnt = scnprintf(buf,maxlen,")");
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ }
+ if ((detail & PVR2_I2C_DETAIL_CTLMASK) && cp->ctl_mask) {
+ unsigned int idx;
+ unsigned long msk,sm;
+ int spcfl;
+ bcnt = scnprintf(buf,maxlen," [");
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ sm = 0;
+ spcfl = 0;
+ for (idx = 0, msk = 1; msk; idx++, msk <<= 1) {
+ if (!(cp->ctl_mask & msk)) continue;
+ opf = pvr2_i2c_get_op(idx);
+ if (opf) {
+ bcnt = scnprintf(buf,maxlen,"%s%s",
+ spcfl ? " " : "",
+ opf->name);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ spcfl = !0;
+ } else {
+ sm |= msk;
+ }
+ }
+ if (sm) {
+ bcnt = scnprintf(buf,maxlen,"%s%lx",
+ idx != 0 ? " " : "",sm);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ }
+ bcnt = scnprintf(buf,maxlen,"]");
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ }
+ return ccnt;
+}
+
+unsigned int pvr2_i2c_report(struct pvr2_hdw *hdw,
+ char *buf,unsigned int maxlen)
+{
+ unsigned int ccnt,bcnt;
+ struct list_head *item;
+ struct pvr2_i2c_client *cp;
+ ccnt = 0;
+ down(&hdw->i2c_list_lock); do {
+ list_for_each(item,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,list);
+ bcnt = pvr2_i2c_client_describe(
+ cp,
+ (PVR2_I2C_DETAIL_HANDLER|
+ PVR2_I2C_DETAIL_CTLMASK),
+ buf,maxlen);
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ bcnt = scnprintf(buf,maxlen,"\n");
+ ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
+ }
+ } while (0); up(&hdw->i2c_list_lock);
+ return ccnt;
+}
+
+static int pvr2_i2c_attach_inform(struct i2c_client *client)
+{
+ struct pvr2_hdw *hdw = (struct pvr2_hdw *)(client->adapter->algo_data);
+ struct pvr2_i2c_client *cp;
+ int fl = !(hdw->i2c_pend_types & PVR2_I2C_PEND_ALL);
+ cp = kmalloc(sizeof(*cp),GFP_KERNEL);
+ trace_i2c("i2c_attach [client=%s @ 0x%x ctxt=%p]",
+ client->name,
+ client->addr,cp);
+ if (!cp) return -ENOMEM;
+ memset(cp,0,sizeof(*cp));
+ INIT_LIST_HEAD(&cp->list);
+ cp->client = client;
+ down(&hdw->i2c_list_lock); do {
+ list_add_tail(&cp->list,&hdw->i2c_clients);
+ hdw->i2c_pend_types |= PVR2_I2C_PEND_DETECT;
+ } while (0); up(&hdw->i2c_list_lock);
+ if (fl) pvr2_hdw_poll_trigger_unlocked(hdw);
+ return 0;
+}
+
+static int pvr2_i2c_detach_inform(struct i2c_client *client)
+{
+ struct pvr2_hdw *hdw = (struct pvr2_hdw *)(client->adapter->algo_data);
+ struct pvr2_i2c_client *cp;
+ struct list_head *item,*nc;
+ unsigned long amask = 0;
+ int foundfl = 0;
+ down(&hdw->i2c_list_lock); do {
+ list_for_each_safe(item,nc,&hdw->i2c_clients) {
+ cp = list_entry(item,struct pvr2_i2c_client,list);
+ if (cp->client == client) {
+ trace_i2c("pvr2_i2c_detach"
+ " [client=%s @ 0x%x ctxt=%p]",
+ client->name,
+ client->addr,cp);
+ if (cp->handler &&
+ cp->handler->func_table->detach) {
+ cp->handler->func_table->detach(
+ cp->handler->func_data);
+ }
+ list_del(&cp->list);
+ kfree(cp);
+ foundfl = !0;
+ continue;
+ }
+ amask |= cp->ctl_mask;
+ }
+ hdw->i2c_active_mask = amask;
+ } while (0); up(&hdw->i2c_list_lock);
+ if (!foundfl) {
+ trace_i2c("pvr2_i2c_detach [client=%s @ 0x%x ctxt=<unknown>]",
+ client->name,
+ client->addr);
+ }
+ return 0;
+}
+
+static struct i2c_algorithm pvr2_i2c_algo_template = {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
+ .id = I2C_ALGO_BIT | I2C_HW_B_BT848,
+#endif
+ .master_xfer = pvr2_i2c_xfer,
+ .algo_control = pvr2_i2c_control,
+ .functionality = pvr2_i2c_functionality,
+};
+
+static struct i2c_adapter pvr2_i2c_adap_template = {
+ .owner = THIS_MODULE,
+ .class = I2C_CLASS_TV_ANALOG,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
+ .id = I2C_ALGO_BIT | I2C_HW_B_BT848,
+#else
+ .id = I2C_HW_B_BT848,
+#endif
+ .client_register = pvr2_i2c_attach_inform,
+ .client_unregister = pvr2_i2c_detach_inform,
+};
+
+static void do_i2c_scan(struct pvr2_hdw *hdw)
+{
+ struct i2c_msg msg[1];
+ int i,rc;
+ msg[0].addr = 0;
+ msg[0].flags = I2C_M_RD;
+ msg[0].len = 0;
+ msg[0].buf = 0;
+ printk("%s: i2c scan beginning\n",hdw->name);
+ for (i = 0; i < 128; i++) {
+ msg[0].addr = i;
+ rc = i2c_transfer(&hdw->i2c_adap,msg,
+ sizeof(msg)/sizeof(msg[0]));
+ if (rc != 1) continue;
+ printk("%s: i2c scan: found device @ 0x%x\n",hdw->name,i);
+ }
+ printk("%s: i2c scan done.\n",hdw->name);
+}
+
+void pvr2_i2c_core_init(struct pvr2_hdw *hdw)
+{
+ memcpy(&hdw->i2c_adap,&pvr2_i2c_adap_template,sizeof(hdw->i2c_adap));
+ memcpy(&hdw->i2c_algo,&pvr2_i2c_algo_template,sizeof(hdw->i2c_algo));
+ strlcpy(hdw->i2c_adap.name,hdw->name,sizeof(hdw->i2c_adap.name));
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
+ strlcpy(hdw->i2c_algo.name,hdw->name,sizeof(hdw->i2c_algo.name));
+#endif
+ hdw->i2c_adap.algo = &hdw->i2c_algo;
+ hdw->i2c_adap.algo_data = hdw;
+ hdw->i2c_pend_mask = 0;
+ hdw->i2c_stale_mask = 0;
+ hdw->i2c_active_mask = 0;
+ INIT_LIST_HEAD(&hdw->i2c_clients);
+ init_MUTEX(&hdw->i2c_list_lock);
+ hdw->i2c_linked = !0;
+ i2c_add_adapter(&hdw->i2c_adap);
+ if (i2c_scan) do_i2c_scan(hdw);
+}
+
+void pvr2_i2c_core_done(struct pvr2_hdw *hdw)
+{
+ if (hdw->i2c_linked) {
+ i2c_del_adapter(&hdw->i2c_adap);
+ hdw->i2c_linked = 0;
+ }
+}
+
+/*
+ Stuff for Emacs to see, in order to encourage consistent editing style:
+ *** Local Variables: ***
+ *** mode: c ***
+ *** fill-column: 75 ***
+ *** tab-width: 8 ***
+ *** c-basic-offset: 8 ***
+ *** End: ***
+ */
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