| /* |
| * |
| * |
| * 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 "pvrusb2-i2c-core.h" |
| #include "pvrusb2-hdw-internal.h" |
| #include "pvrusb2-debug.h" |
| #include "pvrusb2-fx2-cmd.h" |
| #include "pvrusb2.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; |
| module_param(i2c_scan, int, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); |
| |
| static int ir_mode[PVR_NUM] = { [0 ... PVR_NUM-1] = 1 }; |
| module_param_array(ir_mode, int, NULL, 0444); |
| MODULE_PARM_DESC(ir_mode,"specify: 0=disable IR reception, 1=normal IR"); |
| |
| static unsigned int pvr2_i2c_client_describe(struct pvr2_i2c_client *cp, |
| unsigned int detail, |
| char *buf,unsigned int maxlen); |
| |
| 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; |
| |
| |
| if (!data) length = 0; |
| if (length > (sizeof(hdw->cmd_buffer) - 3)) { |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "Killing an I2C write to %u that is too large" |
| " (desired=%u limit=%u)", |
| i2c_addr, |
| length,(unsigned int)(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] = FX2CMD_I2C_WRITE; /* 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]); |
| } |
| } |
| } |
| |
| 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; |
| |
| |
| if (!data) dlen = 0; |
| if (dlen > (sizeof(hdw->cmd_buffer) - 4)) { |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "Killing an I2C read to %u that has wlen too large" |
| " (desired=%u limit=%u)", |
| i2c_addr, |
| dlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 4)); |
| return -ENOTSUPP; |
| } |
| if (res && (rlen > (sizeof(hdw->cmd_buffer) - 1))) { |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "Killing an I2C read to %u that has rlen too large" |
| " (desired=%u limit=%u)", |
| i2c_addr, |
| rlen,(unsigned int)(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] = FX2CMD_I2C_READ; /* 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]); |
| } |
| } |
| } |
| |
| /* 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 the common low level entry point for doing I2C operations to the |
| hardware. */ |
| static int pvr2_i2c_basic_op(struct pvr2_hdw *hdw, |
| u8 i2c_addr, |
| u8 *wdata, |
| u16 wlen, |
| u8 *rdata, |
| u16 rlen) |
| { |
| if (!rdata) rlen = 0; |
| if (!wdata) wlen = 0; |
| if (rlen || !wlen) { |
| return pvr2_i2c_read(hdw,i2c_addr,wdata,wlen,rdata,rlen); |
| } else { |
| return pvr2_i2c_write(hdw,i2c_addr,wdata,wlen); |
| } |
| } |
| |
| |
| /* This is a special entry point for cases of I2C transaction attempts to |
| the IR receiver. The implementation here simulates the IR receiver by |
| issuing a command to the FX2 firmware and using that response to return |
| what the real I2C receiver would have returned. We use this for 24xxx |
| devices, where the IR receiver chip has been removed and replaced with |
| FX2 related logic. */ |
| static int i2c_24xxx_ir(struct pvr2_hdw *hdw, |
| u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) |
| { |
| u8 dat[4]; |
| unsigned int stat; |
| |
| if (!(rlen || wlen)) { |
| /* This is a probe attempt. Just let it succeed. */ |
| return 0; |
| } |
| |
| /* We don't understand this kind of transaction */ |
| if ((wlen != 0) || (rlen == 0)) return -EIO; |
| |
| if (rlen < 3) { |
| /* Mike Isely <isely@pobox.com> Appears to be a probe |
| attempt from lirc. Just fill in zeroes and return. If |
| we try instead to do the full transaction here, then bad |
| things seem to happen within the lirc driver module |
| (version 0.8.0-7 sources from Debian, when run under |
| vanilla 2.6.17.6 kernel) - and I don't have the patience |
| to chase it down. */ |
| if (rlen > 0) rdata[0] = 0; |
| if (rlen > 1) rdata[1] = 0; |
| return 0; |
| } |
| |
| /* Issue a command to the FX2 to read the IR receiver. */ |
| LOCK_TAKE(hdw->ctl_lock); do { |
| hdw->cmd_buffer[0] = FX2CMD_GET_IR_CODE; |
| stat = pvr2_send_request(hdw, |
| hdw->cmd_buffer,1, |
| hdw->cmd_buffer,4); |
| dat[0] = hdw->cmd_buffer[0]; |
| dat[1] = hdw->cmd_buffer[1]; |
| dat[2] = hdw->cmd_buffer[2]; |
| dat[3] = hdw->cmd_buffer[3]; |
| } while (0); LOCK_GIVE(hdw->ctl_lock); |
| |
| /* Give up if that operation failed. */ |
| if (stat != 0) return stat; |
| |
| /* Mangle the results into something that looks like the real IR |
| receiver. */ |
| rdata[2] = 0xc1; |
| if (dat[0] != 1) { |
| /* No code received. */ |
| rdata[0] = 0; |
| rdata[1] = 0; |
| } else { |
| u16 val; |
| /* Mash the FX2 firmware-provided IR code into something |
| that the normal i2c chip-level driver expects. */ |
| val = dat[1]; |
| val <<= 8; |
| val |= dat[2]; |
| val >>= 1; |
| val &= ~0x0003; |
| val |= 0x8000; |
| rdata[0] = (val >> 8) & 0xffu; |
| rdata[1] = val & 0xffu; |
| } |
| |
| return 0; |
| } |
| |
| /* This is a special entry point that is entered if an I2C operation is |
| attempted to a wm8775 chip on model 24xxx hardware. Autodetect of this |
| part doesn't work, but we know it is really there. So let's look for |
| the autodetect attempt and just return success if we see that. */ |
| static int i2c_hack_wm8775(struct pvr2_hdw *hdw, |
| u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) |
| { |
| if (!(rlen || wlen)) { |
| // This is a probe attempt. Just let it succeed. |
| return 0; |
| } |
| return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen); |
| } |
| |
| /* This is an entry point designed to always fail any attempt to perform a |
| transfer. We use this to cause certain I2C addresses to not be |
| probed. */ |
| static int i2c_black_hole(struct pvr2_hdw *hdw, |
| u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) |
| { |
| return -EIO; |
| } |
| |
| /* This is a special entry point that is entered if an I2C operation is |
| attempted to a cx25840 chip on model 24xxx hardware. This chip can |
| sometimes wedge itself. Worse still, when this happens msp3400 can |
| falsely detect this part and then the system gets hosed up after msp3400 |
| gets confused and dies. What we want to do here is try to keep msp3400 |
| away and also try to notice if the chip is wedged and send a warning to |
| the system log. */ |
| static int i2c_hack_cx25840(struct pvr2_hdw *hdw, |
| u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) |
| { |
| int ret; |
| unsigned int subaddr; |
| u8 wbuf[2]; |
| int state = hdw->i2c_cx25840_hack_state; |
| |
| if (!(rlen || wlen)) { |
| // Probe attempt - always just succeed and don't bother the |
| // hardware (this helps to make the state machine further |
| // down somewhat easier). |
| return 0; |
| } |
| |
| if (state == 3) { |
| return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen); |
| } |
| |
| /* We're looking for the exact pattern where the revision register |
| is being read. The cx25840 module will always look at the |
| revision register first. Any other pattern of access therefore |
| has to be a probe attempt from somebody else so we'll reject it. |
| Normally we could just let each client just probe the part |
| anyway, but when the cx25840 is wedged, msp3400 will get a false |
| positive and that just screws things up... */ |
| |
| if (wlen == 0) { |
| switch (state) { |
| case 1: subaddr = 0x0100; break; |
| case 2: subaddr = 0x0101; break; |
| default: goto fail; |
| } |
| } else if (wlen == 2) { |
| subaddr = (wdata[0] << 8) | wdata[1]; |
| switch (subaddr) { |
| case 0x0100: state = 1; break; |
| case 0x0101: state = 2; break; |
| default: goto fail; |
| } |
| } else { |
| goto fail; |
| } |
| if (!rlen) goto success; |
| state = 0; |
| if (rlen != 1) goto fail; |
| |
| /* If we get to here then we have a legitimate read for one of the |
| two revision bytes, so pass it through. */ |
| wbuf[0] = subaddr >> 8; |
| wbuf[1] = subaddr; |
| ret = pvr2_i2c_basic_op(hdw,i2c_addr,wbuf,2,rdata,rlen); |
| |
| if ((ret != 0) || (*rdata == 0x04) || (*rdata == 0x0a)) { |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "WARNING: Detected a wedged cx25840 chip;" |
| " the device will not work."); |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "WARNING: Try power cycling the pvrusb2 device."); |
| pvr2_trace(PVR2_TRACE_ERROR_LEGS, |
| "WARNING: Disabling further access to the device" |
| " to prevent other foul-ups."); |
| // This blocks all further communication with the part. |
| hdw->i2c_func[0x44] = NULL; |
| pvr2_hdw_render_useless(hdw); |
| goto fail; |
| } |
| |
| /* Success! */ |
| pvr2_trace(PVR2_TRACE_CHIPS,"cx25840 appears to be OK."); |
| state = 3; |
| |
| success: |
| hdw->i2c_cx25840_hack_state = state; |
| return 0; |
| |
| fail: |
| hdw->i2c_cx25840_hack_state = state; |
| return -EIO; |
| } |
| |
| /* 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; |
| pvr2_i2c_func funcp = NULL; |
| struct pvr2_hdw *hdw = (struct pvr2_hdw *)(i2c_adap->algo_data); |
| |
| if (!num) { |
| ret = -EINVAL; |
| goto done; |
| } |
| if (msgs[0].addr < PVR2_I2C_FUNC_CNT) { |
| funcp = hdw->i2c_func[msgs[0].addr]; |
| } |
| if (!funcp) { |
| ret = -EIO; |
| 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 (funcp(hdw,msgs[0].addr,NULL,0,NULL,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 (funcp(hdw,msgs[0].addr,NULL,0, |
| msgs[0].buf+offs,bcnt)) { |
| ret = -EIO; |
| goto done; |
| } |
| offs += bcnt; |
| tcnt -= bcnt; |
| } |
| ret = 1; |
| goto done; |
| } else { |
| /* Simple write */ |
| ret = 1; |
| if (funcp(hdw,msgs[0].addr, |
| msgs[0].buf,msgs[0].len,NULL,0)) { |
| ret = -EIO; |
| } |
| goto done; |
| } |
| } else if (num == 2) { |
| if (msgs[0].addr != msgs[1].addr) { |
| trace_i2c("i2c refusing 2 phase transfer with" |
| " conflicting target addresses"); |
| ret = -ENOTSUPP; |
| goto done; |
| } |
| 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 (funcp(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: |
| if (pvrusb2_debug & PVR2_TRACE_I2C_TRAF) { |
| unsigned int idx,offs,cnt; |
| for (idx = 0; idx < num; idx++) { |
| cnt = msgs[idx].len; |
| printk(KERN_INFO |
| "pvrusb2 i2c xfer %u/%u:" |
| " addr=0x%x len=%d %s", |
| idx+1,num, |
| msgs[idx].addr, |
| cnt, |
| (msgs[idx].flags & I2C_M_RD ? |
| "read" : "write")); |
| if ((ret > 0) || !(msgs[idx].flags & I2C_M_RD)) { |
| if (cnt > 8) cnt = 8; |
| printk(" ["); |
| for (offs = 0; offs < (cnt>8?8:cnt); offs++) { |
| if (offs) printk(" "); |
| printk("%02x",msgs[idx].buf[offs]); |
| } |
| if (offs < cnt) printk(" ..."); |
| printk("]"); |
| } |
| if (idx+1 == num) { |
| printk(" result=%d",ret); |
| } |
| printk("\n"); |
| } |
| if (!num) { |
| printk(KERN_INFO |
| "pvrusb2 i2c xfer null transfer result=%d\n", |
| ret); |
| } |
| } |
| return ret; |
| } |
| |
| static u32 pvr2_i2c_functionality(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; |
| } |
| |
| 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->driver.owner)) return -EAGAIN; |
| stat = cp->driver->command(cp,cmd,arg); |
| module_put(cp->driver->driver.owner); |
| return stat; |
| } |
| |
| int pvr2_i2c_client_cmd(struct pvr2_i2c_client *cp,unsigned int cmd,void *arg) |
| { |
| int stat; |
| if (pvrusb2_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 (code=%u 0x%x) to %.*s", |
| cmd,cmd,cnt,buf); |
| } |
| stat = pvr2_i2c_core_singleton(cp->client,cmd,arg); |
| if (pvrusb2_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 (ret=%d)",cnt,buf,stat); |
| } |
| return stat; |
| } |
| |
| int pvr2_i2c_core_cmd(struct pvr2_hdw *hdw,unsigned int cmd,void *arg) |
| { |
| struct pvr2_i2c_client *cp, *ncp; |
| int stat = -EINVAL; |
| |
| if (!hdw) return stat; |
| |
| mutex_lock(&hdw->i2c_list_lock); |
| list_for_each_entry_safe(cp, ncp, &hdw->i2c_clients, list) { |
| if (!cp->recv_enable) continue; |
| mutex_unlock(&hdw->i2c_list_lock); |
| stat = pvr2_i2c_client_cmd(cp,cmd,arg); |
| mutex_lock(&hdw->i2c_list_lock); |
| } |
| mutex_unlock(&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_status_poll(struct pvr2_hdw *hdw) |
| { |
| struct pvr2_i2c_client *cp; |
| mutex_lock(&hdw->i2c_list_lock); do { |
| struct v4l2_tuner *vtp = &hdw->tuner_signal_info; |
| memset(vtp,0,sizeof(*vtp)); |
| list_for_each_entry(cp, &hdw->i2c_clients, list) { |
| if (!cp->detected_flag) continue; |
| if (!cp->status_poll) continue; |
| cp->status_poll(cp); |
| } |
| hdw->tuner_signal_stale = 0; |
| pvr2_trace(PVR2_TRACE_CHIPS,"i2c status poll" |
| " type=%u strength=%u audio=0x%x cap=0x%x" |
| " low=%u hi=%u", |
| vtp->type, |
| vtp->signal,vtp->rxsubchans,vtp->capability, |
| vtp->rangelow,vtp->rangehigh); |
| } while (0); mutex_unlock(&hdw->i2c_list_lock); |
| } |
| |
| |
| /* Issue various I2C operations to bring chip-level drivers into sync with |
| state stored in this driver. */ |
| void pvr2_i2c_core_sync(struct pvr2_hdw *hdw) |
| { |
| unsigned long msk; |
| unsigned int idx; |
| struct pvr2_i2c_client *cp, *ncp; |
| |
| if (!hdw->i2c_linked) return; |
| if (!(hdw->i2c_pend_types & PVR2_I2C_PEND_ALL)) { |
| return; |
| } |
| mutex_lock(&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_entry(cp, &hdw->i2c_clients, 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_entry(cp, &hdw->i2c_clients, 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_entry_safe(cp, ncp, &hdw->i2c_clients, |
| list) { |
| if (!cp->handler) continue; |
| if (!cp->handler->func_table->update) continue; |
| pvr2_trace(PVR2_TRACE_I2C_CORE, |
| "i2c: cp=%p update",cp); |
| mutex_unlock(&hdw->i2c_list_lock); |
| cp->handler->func_table->update( |
| cp->handler->func_data); |
| mutex_lock(&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_entry(cp, &hdw->i2c_clients, |
| 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; |
| mutex_unlock(&hdw->i2c_list_lock); |
| opf->update(hdw); |
| mutex_lock(&hdw->i2c_list_lock); |
| } |
| } |
| pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: core_sync END"); |
| } while (0); mutex_unlock(&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 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_entry(cp, &hdw->i2c_clients, list) |
| if (handler_check(cp)) |
| pt |= PVR2_I2C_PEND_CLIENT; |
| |
| if (pt) { |
| mutex_lock(&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); mutex_unlock(&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; |
| } |
| |
| static 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 pvr2_i2c_client *cp; |
| ccnt = 0; |
| mutex_lock(&hdw->i2c_list_lock); do { |
| list_for_each_entry(cp, &hdw->i2c_clients, 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); mutex_unlock(&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 = kzalloc(sizeof(*cp),GFP_KERNEL); |
| trace_i2c("i2c_attach [client=%s @ 0x%x ctxt=%p]", |
| client->name, |
| client->addr,cp); |
| if (!cp) return -ENOMEM; |
| cp->hdw = hdw; |
| INIT_LIST_HEAD(&cp->list); |
| cp->client = client; |
| mutex_lock(&hdw->i2c_list_lock); do { |
| hdw->cropcap_stale = !0; |
| list_add_tail(&cp->list,&hdw->i2c_clients); |
| hdw->i2c_pend_types |= PVR2_I2C_PEND_DETECT; |
| } while (0); mutex_unlock(&hdw->i2c_list_lock); |
| if (fl) queue_work(hdw->workqueue,&hdw->worki2csync); |
| 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, *ncp; |
| unsigned long amask = 0; |
| int foundfl = 0; |
| mutex_lock(&hdw->i2c_list_lock); do { |
| hdw->cropcap_stale = !0; |
| list_for_each_entry_safe(cp, ncp, &hdw->i2c_clients, 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); mutex_unlock(&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 = { |
| .master_xfer = pvr2_i2c_xfer, |
| .functionality = pvr2_i2c_functionality, |
| }; |
| |
| static struct i2c_adapter pvr2_i2c_adap_template = { |
| .owner = THIS_MODULE, |
| .class = I2C_CLASS_TV_ANALOG, |
| .id = I2C_HW_B_BT848, |
| .client_register = pvr2_i2c_attach_inform, |
| .client_unregister = pvr2_i2c_detach_inform, |
| }; |
| |
| |
| /* Return true if device exists at given address */ |
| static int do_i2c_probe(struct pvr2_hdw *hdw, int addr) |
| { |
| struct i2c_msg msg[1]; |
| int rc; |
| msg[0].addr = 0; |
| msg[0].flags = I2C_M_RD; |
| msg[0].len = 0; |
| msg[0].buf = NULL; |
| msg[0].addr = addr; |
| rc = i2c_transfer(&hdw->i2c_adap, msg, ARRAY_SIZE(msg)); |
| return rc == 1; |
| } |
| |
| static void do_i2c_scan(struct pvr2_hdw *hdw) |
| { |
| int i; |
| printk(KERN_INFO "%s: i2c scan beginning\n", hdw->name); |
| for (i = 0; i < 128; i++) { |
| if (do_i2c_probe(hdw, i)) { |
| printk(KERN_INFO "%s: i2c scan: found device @ 0x%x\n", |
| hdw->name, i); |
| } |
| } |
| printk(KERN_INFO "%s: i2c scan done.\n", hdw->name); |
| } |
| |
| void pvr2_i2c_core_init(struct pvr2_hdw *hdw) |
| { |
| unsigned int idx; |
| |
| /* The default action for all possible I2C addresses is just to do |
| the transfer normally. */ |
| for (idx = 0; idx < PVR2_I2C_FUNC_CNT; idx++) { |
| hdw->i2c_func[idx] = pvr2_i2c_basic_op; |
| } |
| |
| /* However, deal with various special cases for 24xxx hardware. */ |
| if (ir_mode[hdw->unit_number] == 0) { |
| printk(KERN_INFO "%s: IR disabled\n",hdw->name); |
| hdw->i2c_func[0x18] = i2c_black_hole; |
| } else if (ir_mode[hdw->unit_number] == 1) { |
| if (hdw->hdw_desc->ir_scheme == PVR2_IR_SCHEME_24XXX) { |
| /* This comment is present PURELY to get |
| checkpatch.pl to STFU. Lovely, eh? */ |
| hdw->i2c_func[0x18] = i2c_24xxx_ir; |
| } |
| } |
| if (hdw->hdw_desc->flag_has_cx25840) { |
| hdw->i2c_func[0x44] = i2c_hack_cx25840; |
| } |
| if (hdw->hdw_desc->flag_has_wm8775) { |
| hdw->i2c_func[0x1b] = i2c_hack_wm8775; |
| } |
| |
| // Configure the adapter and set up everything else related to it. |
| 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)); |
| hdw->i2c_adap.dev.parent = &hdw->usb_dev->dev; |
| 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); |
| mutex_init(&hdw->i2c_list_lock); |
| hdw->i2c_linked = !0; |
| i2c_add_adapter(&hdw->i2c_adap); |
| if (hdw->i2c_func[0x18] == i2c_24xxx_ir) { |
| /* Probe for a different type of IR receiver on this |
| device. If present, disable the emulated IR receiver. */ |
| if (do_i2c_probe(hdw, 0x71)) { |
| pvr2_trace(PVR2_TRACE_INFO, |
| "Device has newer IR hardware;" |
| " disabling unneeded virtual IR device"); |
| hdw->i2c_func[0x18] = NULL; |
| } |
| } |
| 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: *** |
| */ |