diff options
Diffstat (limited to 'kernel/drivers/media/pci/ivtv/ivtv-i2c.c')
| -rw-r--r-- | kernel/drivers/media/pci/ivtv/ivtv-i2c.c | 755 |
1 files changed, 755 insertions, 0 deletions
diff --git a/kernel/drivers/media/pci/ivtv/ivtv-i2c.c b/kernel/drivers/media/pci/ivtv/ivtv-i2c.c new file mode 100644 index 000000000..1a41ba5c7 --- /dev/null +++ b/kernel/drivers/media/pci/ivtv/ivtv-i2c.c @@ -0,0 +1,755 @@ +/* + I2C functions + Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> + Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> + + 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* + This file includes an i2c implementation that was reverse engineered + from the Hauppauge windows driver. Older ivtv versions used i2c-algo-bit, + which whilst fine under most circumstances, had trouble with the Zilog + CPU on the PVR-150 which handles IR functions (occasional inability to + communicate with the chip until it was reset) and also with the i2c + bus being completely unreachable when multiple PVR cards were present. + + The implementation is very similar to i2c-algo-bit, but there are enough + subtle differences that the two are hard to merge. The general strategy + employed by i2c-algo-bit is to use udelay() to implement the timing + when putting out bits on the scl/sda lines. The general strategy taken + here is to poll the lines for state changes (see ivtv_waitscl and + ivtv_waitsda). In addition there are small delays at various locations + which poll the SCL line 5 times (ivtv_scldelay). I would guess that + since this is memory mapped I/O that the length of those delays is tied + to the PCI bus clock. There is some extra code to do with recovery + and retries. Since it is not known what causes the actual i2c problems + in the first place, the only goal if one was to attempt to use + i2c-algo-bit would be to try to make it follow the same code path. + This would be a lot of work, and I'm also not convinced that it would + provide a generic benefit to i2c-algo-bit. Therefore consider this + an engineering solution -- not pretty, but it works. + + Some more general comments about what we are doing: + + The i2c bus is a 2 wire serial bus, with clock (SCL) and data (SDA) + lines. To communicate on the bus (as a master, we don't act as a slave), + we first initiate a start condition (ivtv_start). We then write the + address of the device that we want to communicate with, along with a flag + that indicates whether this is a read or a write. The slave then issues + an ACK signal (ivtv_ack), which tells us that it is ready for reading / + writing. We then proceed with reading or writing (ivtv_read/ivtv_write), + and finally issue a stop condition (ivtv_stop) to make the bus available + to other masters. + + There is an additional form of transaction where a write may be + immediately followed by a read. In this case, there is no intervening + stop condition. (Only the msp3400 chip uses this method of data transfer). + */ + +#include "ivtv-driver.h" +#include "ivtv-cards.h" +#include "ivtv-gpio.h" +#include "ivtv-i2c.h" +#include <media/cx25840.h> + +/* i2c implementation for cx23415/6 chip, ivtv project. + * Author: Kevin Thayer (nufan_wfk at yahoo.com) + */ +/* i2c stuff */ +#define IVTV_REG_I2C_SETSCL_OFFSET 0x7000 +#define IVTV_REG_I2C_SETSDA_OFFSET 0x7004 +#define IVTV_REG_I2C_GETSCL_OFFSET 0x7008 +#define IVTV_REG_I2C_GETSDA_OFFSET 0x700c + +#define IVTV_CS53L32A_I2C_ADDR 0x11 +#define IVTV_M52790_I2C_ADDR 0x48 +#define IVTV_CX25840_I2C_ADDR 0x44 +#define IVTV_SAA7115_I2C_ADDR 0x21 +#define IVTV_SAA7127_I2C_ADDR 0x44 +#define IVTV_SAA717x_I2C_ADDR 0x21 +#define IVTV_MSP3400_I2C_ADDR 0x40 +#define IVTV_HAUPPAUGE_I2C_ADDR 0x50 +#define IVTV_WM8739_I2C_ADDR 0x1a +#define IVTV_WM8775_I2C_ADDR 0x1b +#define IVTV_TEA5767_I2C_ADDR 0x60 +#define IVTV_UPD64031A_I2C_ADDR 0x12 +#define IVTV_UPD64083_I2C_ADDR 0x5c +#define IVTV_VP27SMPX_I2C_ADDR 0x5b +#define IVTV_M52790_I2C_ADDR 0x48 +#define IVTV_AVERMEDIA_IR_RX_I2C_ADDR 0x40 +#define IVTV_HAUP_EXT_IR_RX_I2C_ADDR 0x1a +#define IVTV_HAUP_INT_IR_RX_I2C_ADDR 0x18 +#define IVTV_Z8F0811_IR_TX_I2C_ADDR 0x70 +#define IVTV_Z8F0811_IR_RX_I2C_ADDR 0x71 +#define IVTV_ADAPTEC_IR_ADDR 0x6b + +/* This array should match the IVTV_HW_ defines */ +static const u8 hw_addrs[] = { + IVTV_CX25840_I2C_ADDR, + IVTV_SAA7115_I2C_ADDR, + IVTV_SAA7127_I2C_ADDR, + IVTV_MSP3400_I2C_ADDR, + 0, + IVTV_WM8775_I2C_ADDR, + IVTV_CS53L32A_I2C_ADDR, + 0, + IVTV_SAA7115_I2C_ADDR, + IVTV_UPD64031A_I2C_ADDR, + IVTV_UPD64083_I2C_ADDR, + IVTV_SAA717x_I2C_ADDR, + IVTV_WM8739_I2C_ADDR, + IVTV_VP27SMPX_I2C_ADDR, + IVTV_M52790_I2C_ADDR, + 0, /* IVTV_HW_GPIO dummy driver ID */ + IVTV_AVERMEDIA_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_AVER */ + IVTV_HAUP_EXT_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_HAUP_EXT */ + IVTV_HAUP_INT_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_HAUP_INT */ + IVTV_Z8F0811_IR_TX_I2C_ADDR, /* IVTV_HW_Z8F0811_IR_TX_HAUP */ + IVTV_Z8F0811_IR_RX_I2C_ADDR, /* IVTV_HW_Z8F0811_IR_RX_HAUP */ + IVTV_ADAPTEC_IR_ADDR, /* IVTV_HW_I2C_IR_RX_ADAPTEC */ +}; + +/* This array should match the IVTV_HW_ defines */ +static const char * const hw_devicenames[] = { + "cx25840", + "saa7115", + "saa7127_auto", /* saa7127 or saa7129 */ + "msp3400", + "tuner", + "wm8775", + "cs53l32a", + "tveeprom", + "saa7114", + "upd64031a", + "upd64083", + "saa717x", + "wm8739", + "vp27smpx", + "m52790", + "gpio", + "ir_video", /* IVTV_HW_I2C_IR_RX_AVER */ + "ir_video", /* IVTV_HW_I2C_IR_RX_HAUP_EXT */ + "ir_video", /* IVTV_HW_I2C_IR_RX_HAUP_INT */ + "ir_tx_z8f0811_haup", /* IVTV_HW_Z8F0811_IR_TX_HAUP */ + "ir_rx_z8f0811_haup", /* IVTV_HW_Z8F0811_IR_RX_HAUP */ + "ir_video", /* IVTV_HW_I2C_IR_RX_ADAPTEC */ +}; + +static int get_key_adaptec(struct IR_i2c *ir, enum rc_type *protocol, + u32 *scancode, u8 *toggle) +{ + unsigned char keybuf[4]; + + keybuf[0] = 0x00; + i2c_master_send(ir->c, keybuf, 1); + /* poll IR chip */ + if (i2c_master_recv(ir->c, keybuf, sizeof(keybuf)) != sizeof(keybuf)) { + return 0; + } + + /* key pressed ? */ + if (keybuf[2] == 0xff) + return 0; + + /* remove repeat bit */ + keybuf[2] &= 0x7f; + keybuf[3] |= 0x80; + + *protocol = RC_TYPE_UNKNOWN; + *scancode = keybuf[3] | keybuf[2] << 8 | keybuf[1] << 16 |keybuf[0] << 24; + *toggle = 0; + return 1; +} + +static int ivtv_i2c_new_ir(struct ivtv *itv, u32 hw, const char *type, u8 addr) +{ + struct i2c_board_info info; + struct i2c_adapter *adap = &itv->i2c_adap; + struct IR_i2c_init_data *init_data = &itv->ir_i2c_init_data; + unsigned short addr_list[2] = { addr, I2C_CLIENT_END }; + + /* Only allow one IR transmitter to be registered per board */ + if (hw & IVTV_HW_IR_TX_ANY) { + if (itv->hw_flags & IVTV_HW_IR_TX_ANY) + return -1; + memset(&info, 0, sizeof(struct i2c_board_info)); + strlcpy(info.type, type, I2C_NAME_SIZE); + return i2c_new_probed_device(adap, &info, addr_list, NULL) + == NULL ? -1 : 0; + } + + /* Only allow one IR receiver to be registered per board */ + if (itv->hw_flags & IVTV_HW_IR_RX_ANY) + return -1; + + /* Our default information for ir-kbd-i2c.c to use */ + switch (hw) { + case IVTV_HW_I2C_IR_RX_AVER: + init_data->ir_codes = RC_MAP_AVERMEDIA_CARDBUS; + init_data->internal_get_key_func = + IR_KBD_GET_KEY_AVERMEDIA_CARDBUS; + init_data->type = RC_BIT_OTHER; + init_data->name = "AVerMedia AVerTV card"; + break; + case IVTV_HW_I2C_IR_RX_HAUP_EXT: + case IVTV_HW_I2C_IR_RX_HAUP_INT: + init_data->ir_codes = RC_MAP_HAUPPAUGE; + init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP; + init_data->type = RC_BIT_RC5; + init_data->name = itv->card_name; + break; + case IVTV_HW_Z8F0811_IR_RX_HAUP: + /* Default to grey remote */ + init_data->ir_codes = RC_MAP_HAUPPAUGE; + init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR; + init_data->type = RC_BIT_RC5; + init_data->name = itv->card_name; + break; + case IVTV_HW_I2C_IR_RX_ADAPTEC: + init_data->get_key = get_key_adaptec; + init_data->name = itv->card_name; + /* FIXME: The protocol and RC_MAP needs to be corrected */ + init_data->ir_codes = RC_MAP_EMPTY; + init_data->type = RC_BIT_UNKNOWN; + break; + } + + memset(&info, 0, sizeof(struct i2c_board_info)); + info.platform_data = init_data; + strlcpy(info.type, type, I2C_NAME_SIZE); + + return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ? + -1 : 0; +} + +/* Instantiate the IR receiver device using probing -- undesirable */ +struct i2c_client *ivtv_i2c_new_ir_legacy(struct ivtv *itv) +{ + struct i2c_board_info info; + /* + * The external IR receiver is at i2c address 0x34. + * The internal IR receiver is at i2c address 0x30. + * + * In theory, both can be fitted, and Hauppauge suggests an external + * overrides an internal. That's why we probe 0x1a (~0x34) first. CB + * + * Some of these addresses we probe may collide with other i2c address + * allocations, so this function must be called after all other i2c + * devices we care about are registered. + */ + const unsigned short addr_list[] = { + 0x1a, /* Hauppauge IR external - collides with WM8739 */ + 0x18, /* Hauppauge IR internal */ + I2C_CLIENT_END + }; + + memset(&info, 0, sizeof(struct i2c_board_info)); + strlcpy(info.type, "ir_video", I2C_NAME_SIZE); + return i2c_new_probed_device(&itv->i2c_adap, &info, addr_list, NULL); +} + +int ivtv_i2c_register(struct ivtv *itv, unsigned idx) +{ + struct v4l2_subdev *sd; + struct i2c_adapter *adap = &itv->i2c_adap; + const char *type = hw_devicenames[idx]; + u32 hw = 1 << idx; + + if (hw == IVTV_HW_TUNER) { + /* special tuner handling */ + sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, adap, type, 0, + itv->card_i2c->radio); + if (sd) + sd->grp_id = 1 << idx; + sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, adap, type, 0, + itv->card_i2c->demod); + if (sd) + sd->grp_id = 1 << idx; + sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, adap, type, 0, + itv->card_i2c->tv); + if (sd) + sd->grp_id = 1 << idx; + return sd ? 0 : -1; + } + + if (hw & IVTV_HW_IR_ANY) + return ivtv_i2c_new_ir(itv, hw, type, hw_addrs[idx]); + + /* Is it not an I2C device or one we do not wish to register? */ + if (!hw_addrs[idx]) + return -1; + + /* It's an I2C device other than an analog tuner or IR chip */ + if (hw == IVTV_HW_UPD64031A || hw == IVTV_HW_UPD6408X) { + sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, + adap, type, 0, I2C_ADDRS(hw_addrs[idx])); + } else if (hw == IVTV_HW_CX25840) { + struct cx25840_platform_data pdata; + struct i2c_board_info cx25840_info = { + .type = "cx25840", + .addr = hw_addrs[idx], + .platform_data = &pdata, + }; + + pdata.pvr150_workaround = itv->pvr150_workaround; + sd = v4l2_i2c_new_subdev_board(&itv->v4l2_dev, adap, + &cx25840_info, NULL); + } else { + sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, + adap, type, hw_addrs[idx], NULL); + } + if (sd) + sd->grp_id = 1 << idx; + return sd ? 0 : -1; +} + +struct v4l2_subdev *ivtv_find_hw(struct ivtv *itv, u32 hw) +{ + struct v4l2_subdev *result = NULL; + struct v4l2_subdev *sd; + + spin_lock(&itv->v4l2_dev.lock); + v4l2_device_for_each_subdev(sd, &itv->v4l2_dev) { + if (sd->grp_id == hw) { + result = sd; + break; + } + } + spin_unlock(&itv->v4l2_dev.lock); + return result; +} + +/* Set the serial clock line to the desired state */ +static void ivtv_setscl(struct ivtv *itv, int state) +{ + /* write them out */ + /* write bits are inverted */ + write_reg(~state, IVTV_REG_I2C_SETSCL_OFFSET); +} + +/* Set the serial data line to the desired state */ +static void ivtv_setsda(struct ivtv *itv, int state) +{ + /* write them out */ + /* write bits are inverted */ + write_reg(~state & 1, IVTV_REG_I2C_SETSDA_OFFSET); +} + +/* Read the serial clock line */ +static int ivtv_getscl(struct ivtv *itv) +{ + return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; +} + +/* Read the serial data line */ +static int ivtv_getsda(struct ivtv *itv) +{ + return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; +} + +/* Implement a short delay by polling the serial clock line */ +static void ivtv_scldelay(struct ivtv *itv) +{ + int i; + + for (i = 0; i < 5; ++i) + ivtv_getscl(itv); +} + +/* Wait for the serial clock line to become set to a specific value */ +static int ivtv_waitscl(struct ivtv *itv, int val) +{ + int i; + + ivtv_scldelay(itv); + for (i = 0; i < 1000; ++i) { + if (ivtv_getscl(itv) == val) + return 1; + } + return 0; +} + +/* Wait for the serial data line to become set to a specific value */ +static int ivtv_waitsda(struct ivtv *itv, int val) +{ + int i; + + ivtv_scldelay(itv); + for (i = 0; i < 1000; ++i) { + if (ivtv_getsda(itv) == val) + return 1; + } + return 0; +} + +/* Wait for the slave to issue an ACK */ +static int ivtv_ack(struct ivtv *itv) +{ + int ret = 0; + + if (ivtv_getscl(itv) == 1) { + IVTV_DEBUG_HI_I2C("SCL was high starting an ack\n"); + ivtv_setscl(itv, 0); + if (!ivtv_waitscl(itv, 0)) { + IVTV_DEBUG_I2C("Could not set SCL low starting an ack\n"); + return -EREMOTEIO; + } + } + ivtv_setsda(itv, 1); + ivtv_scldelay(itv); + ivtv_setscl(itv, 1); + if (!ivtv_waitsda(itv, 0)) { + IVTV_DEBUG_I2C("Slave did not ack\n"); + ret = -EREMOTEIO; + } + ivtv_setscl(itv, 0); + if (!ivtv_waitscl(itv, 0)) { + IVTV_DEBUG_I2C("Failed to set SCL low after ACK\n"); + ret = -EREMOTEIO; + } + return ret; +} + +/* Write a single byte to the i2c bus and wait for the slave to ACK */ +static int ivtv_sendbyte(struct ivtv *itv, unsigned char byte) +{ + int i, bit; + + IVTV_DEBUG_HI_I2C("write %x\n",byte); + for (i = 0; i < 8; ++i, byte<<=1) { + ivtv_setscl(itv, 0); + if (!ivtv_waitscl(itv, 0)) { + IVTV_DEBUG_I2C("Error setting SCL low\n"); + return -EREMOTEIO; + } + bit = (byte>>7)&1; + ivtv_setsda(itv, bit); + if (!ivtv_waitsda(itv, bit)) { + IVTV_DEBUG_I2C("Error setting SDA\n"); + return -EREMOTEIO; + } + ivtv_setscl(itv, 1); + if (!ivtv_waitscl(itv, 1)) { + IVTV_DEBUG_I2C("Slave not ready for bit\n"); + return -EREMOTEIO; + } + } + ivtv_setscl(itv, 0); + if (!ivtv_waitscl(itv, 0)) { + IVTV_DEBUG_I2C("Error setting SCL low\n"); + return -EREMOTEIO; + } + return ivtv_ack(itv); +} + +/* Read a byte from the i2c bus and send a NACK if applicable (i.e. for the + final byte) */ +static int ivtv_readbyte(struct ivtv *itv, unsigned char *byte, int nack) +{ + int i; + + *byte = 0; + + ivtv_setsda(itv, 1); + ivtv_scldelay(itv); + for (i = 0; i < 8; ++i) { + ivtv_setscl(itv, 0); + ivtv_scldelay(itv); + ivtv_setscl(itv, 1); + if (!ivtv_waitscl(itv, 1)) { + IVTV_DEBUG_I2C("Error setting SCL high\n"); + return -EREMOTEIO; + } + *byte = ((*byte)<<1)|ivtv_getsda(itv); + } + ivtv_setscl(itv, 0); + ivtv_scldelay(itv); + ivtv_setsda(itv, nack); + ivtv_scldelay(itv); + ivtv_setscl(itv, 1); + ivtv_scldelay(itv); + ivtv_setscl(itv, 0); + ivtv_scldelay(itv); + IVTV_DEBUG_HI_I2C("read %x\n",*byte); + return 0; +} + +/* Issue a start condition on the i2c bus to alert slaves to prepare for + an address write */ +static int ivtv_start(struct ivtv *itv) +{ + int sda; + + sda = ivtv_getsda(itv); + if (sda != 1) { + IVTV_DEBUG_HI_I2C("SDA was low at start\n"); + ivtv_setsda(itv, 1); + if (!ivtv_waitsda(itv, 1)) { + IVTV_DEBUG_I2C("SDA stuck low\n"); + return -EREMOTEIO; + } + } + if (ivtv_getscl(itv) != 1) { + ivtv_setscl(itv, 1); + if (!ivtv_waitscl(itv, 1)) { + IVTV_DEBUG_I2C("SCL stuck low at start\n"); + return -EREMOTEIO; + } + } + ivtv_setsda(itv, 0); + ivtv_scldelay(itv); + return 0; +} + +/* Issue a stop condition on the i2c bus to release it */ +static int ivtv_stop(struct ivtv *itv) +{ + int i; + + if (ivtv_getscl(itv) != 0) { + IVTV_DEBUG_HI_I2C("SCL not low when stopping\n"); + ivtv_setscl(itv, 0); + if (!ivtv_waitscl(itv, 0)) { + IVTV_DEBUG_I2C("SCL could not be set low\n"); + } + } + ivtv_setsda(itv, 0); + ivtv_scldelay(itv); + ivtv_setscl(itv, 1); + if (!ivtv_waitscl(itv, 1)) { + IVTV_DEBUG_I2C("SCL could not be set high\n"); + return -EREMOTEIO; + } + ivtv_scldelay(itv); + ivtv_setsda(itv, 1); + if (!ivtv_waitsda(itv, 1)) { + IVTV_DEBUG_I2C("resetting I2C\n"); + for (i = 0; i < 16; ++i) { + ivtv_setscl(itv, 0); + ivtv_scldelay(itv); + ivtv_setscl(itv, 1); + ivtv_scldelay(itv); + ivtv_setsda(itv, 1); + } + ivtv_waitsda(itv, 1); + return -EREMOTEIO; + } + return 0; +} + +/* Write a message to the given i2c slave. do_stop may be 0 to prevent + issuing the i2c stop condition (when following with a read) */ +static int ivtv_write(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len, int do_stop) +{ + int retry, ret = -EREMOTEIO; + u32 i; + + for (retry = 0; ret != 0 && retry < 8; ++retry) { + ret = ivtv_start(itv); + + if (ret == 0) { + ret = ivtv_sendbyte(itv, addr<<1); + for (i = 0; ret == 0 && i < len; ++i) + ret = ivtv_sendbyte(itv, data[i]); + } + if (ret != 0 || do_stop) { + ivtv_stop(itv); + } + } + if (ret) + IVTV_DEBUG_I2C("i2c write to %x failed\n", addr); + return ret; +} + +/* Read data from the given i2c slave. A stop condition is always issued. */ +static int ivtv_read(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len) +{ + int retry, ret = -EREMOTEIO; + u32 i; + + for (retry = 0; ret != 0 && retry < 8; ++retry) { + ret = ivtv_start(itv); + if (ret == 0) + ret = ivtv_sendbyte(itv, (addr << 1) | 1); + for (i = 0; ret == 0 && i < len; ++i) { + ret = ivtv_readbyte(itv, &data[i], i == len - 1); + } + ivtv_stop(itv); + } + if (ret) + IVTV_DEBUG_I2C("i2c read from %x failed\n", addr); + return ret; +} + +/* Kernel i2c transfer implementation. Takes a number of messages to be read + or written. If a read follows a write, this will occur without an + intervening stop condition */ +static int ivtv_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) +{ + struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap); + struct ivtv *itv = to_ivtv(v4l2_dev); + int retval; + int i; + + mutex_lock(&itv->i2c_bus_lock); + for (i = retval = 0; retval == 0 && i < num; i++) { + if (msgs[i].flags & I2C_M_RD) + retval = ivtv_read(itv, msgs[i].addr, msgs[i].buf, msgs[i].len); + else { + /* if followed by a read, don't stop */ + int stop = !(i + 1 < num && msgs[i + 1].flags == I2C_M_RD); + + retval = ivtv_write(itv, msgs[i].addr, msgs[i].buf, msgs[i].len, stop); + } + } + mutex_unlock(&itv->i2c_bus_lock); + return retval ? retval : num; +} + +/* Kernel i2c capabilities */ +static u32 ivtv_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static struct i2c_algorithm ivtv_algo = { + .master_xfer = ivtv_xfer, + .functionality = ivtv_functionality, +}; + +/* template for our-bit banger */ +static struct i2c_adapter ivtv_i2c_adap_hw_template = { + .name = "ivtv i2c driver", + .algo = &ivtv_algo, + .algo_data = NULL, /* filled from template */ + .owner = THIS_MODULE, +}; + +static void ivtv_setscl_old(void *data, int state) +{ + struct ivtv *itv = (struct ivtv *)data; + + if (state) + itv->i2c_state |= 0x01; + else + itv->i2c_state &= ~0x01; + + /* write them out */ + /* write bits are inverted */ + write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSCL_OFFSET); +} + +static void ivtv_setsda_old(void *data, int state) +{ + struct ivtv *itv = (struct ivtv *)data; + + if (state) + itv->i2c_state |= 0x01; + else + itv->i2c_state &= ~0x01; + + /* write them out */ + /* write bits are inverted */ + write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSDA_OFFSET); +} + +static int ivtv_getscl_old(void *data) +{ + struct ivtv *itv = (struct ivtv *)data; + + return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; +} + +static int ivtv_getsda_old(void *data) +{ + struct ivtv *itv = (struct ivtv *)data; + + return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; +} + +/* template for i2c-bit-algo */ +static struct i2c_adapter ivtv_i2c_adap_template = { + .name = "ivtv i2c driver", + .algo = NULL, /* set by i2c-algo-bit */ + .algo_data = NULL, /* filled from template */ + .owner = THIS_MODULE, +}; + +#define IVTV_ALGO_BIT_TIMEOUT (2) /* seconds */ + +static const struct i2c_algo_bit_data ivtv_i2c_algo_template = { + .setsda = ivtv_setsda_old, + .setscl = ivtv_setscl_old, + .getsda = ivtv_getsda_old, + .getscl = ivtv_getscl_old, + .udelay = IVTV_DEFAULT_I2C_CLOCK_PERIOD / 2, /* microseconds */ + .timeout = IVTV_ALGO_BIT_TIMEOUT * HZ, /* jiffies */ +}; + +static struct i2c_client ivtv_i2c_client_template = { + .name = "ivtv internal", +}; + +/* init + register i2c adapter */ +int init_ivtv_i2c(struct ivtv *itv) +{ + int retval; + + IVTV_DEBUG_I2C("i2c init\n"); + + /* Sanity checks for the I2C hardware arrays. They must be the + * same size. + */ + if (ARRAY_SIZE(hw_devicenames) != ARRAY_SIZE(hw_addrs)) { + IVTV_ERR("Mismatched I2C hardware arrays\n"); + return -ENODEV; + } + if (itv->options.newi2c > 0) { + itv->i2c_adap = ivtv_i2c_adap_hw_template; + } else { + itv->i2c_adap = ivtv_i2c_adap_template; + itv->i2c_algo = ivtv_i2c_algo_template; + } + itv->i2c_algo.udelay = itv->options.i2c_clock_period / 2; + itv->i2c_algo.data = itv; + itv->i2c_adap.algo_data = &itv->i2c_algo; + + sprintf(itv->i2c_adap.name + strlen(itv->i2c_adap.name), " #%d", + itv->instance); + i2c_set_adapdata(&itv->i2c_adap, &itv->v4l2_dev); + + itv->i2c_client = ivtv_i2c_client_template; + itv->i2c_client.adapter = &itv->i2c_adap; + itv->i2c_adap.dev.parent = &itv->pdev->dev; + + IVTV_DEBUG_I2C("setting scl and sda to 1\n"); + ivtv_setscl(itv, 1); + ivtv_setsda(itv, 1); + + if (itv->options.newi2c > 0) + retval = i2c_add_adapter(&itv->i2c_adap); + else + retval = i2c_bit_add_bus(&itv->i2c_adap); + + return retval; +} + +void exit_ivtv_i2c(struct ivtv *itv) +{ + IVTV_DEBUG_I2C("i2c exit\n"); + + i2c_del_adapter(&itv->i2c_adap); +} |