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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/media/common/b2c2/flexcop-i2c.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/media/common/b2c2/flexcop-i2c.c')
-rw-r--r-- | kernel/drivers/media/common/b2c2/flexcop-i2c.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/kernel/drivers/media/common/b2c2/flexcop-i2c.c b/kernel/drivers/media/common/b2c2/flexcop-i2c.c new file mode 100644 index 000000000..965d5eb33 --- /dev/null +++ b/kernel/drivers/media/common/b2c2/flexcop-i2c.c @@ -0,0 +1,288 @@ +/* + * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III + * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization + * see flexcop.c for copyright information + */ +#include "flexcop.h" + +#define FC_MAX_I2C_RETRIES 100000 + +static int flexcop_i2c_operation(struct flexcop_device *fc, + flexcop_ibi_value *r100) +{ + int i; + flexcop_ibi_value r; + + r100->tw_sm_c_100.working_start = 1; + deb_i2c("r100 before: %08x\n",r100->raw); + + fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); + fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ + + for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { + r = fc->read_ibi_reg(fc, tw_sm_c_100); + + if (!r.tw_sm_c_100.no_base_addr_ack_error) { + if (r.tw_sm_c_100.st_done) { + *r100 = r; + deb_i2c("i2c success\n"); + return 0; + } + } else { + deb_i2c("suffering from an i2c ack_error\n"); + return -EREMOTEIO; + } + } + deb_i2c("tried %d times i2c operation, " + "never finished or too many ack errors.\n", i); + return -EREMOTEIO; +} + +static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c, + flexcop_ibi_value r100, u8 *buf) +{ + flexcop_ibi_value r104; + int len = r100.tw_sm_c_100.total_bytes, + /* remember total_bytes is buflen-1 */ + ret; + + /* work-around to have CableStar2 and SkyStar2 rev 2.7 work + * correctly: + * + * the ITD1000 is behind an i2c-gate which closes automatically + * after an i2c-transaction the STV0297 needs 2 consecutive reads + * one with no_base_addr = 0 and one with 1 + * + * those two work-arounds are conflictin: we check for the card + * type, it is set when probing the ITD1000 */ + if (i2c->fc->dev_type == FC_SKY_REV27) + r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; + + ret = flexcop_i2c_operation(i2c->fc, &r100); + if (ret != 0) { + deb_i2c("Retrying operation\n"); + r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; + ret = flexcop_i2c_operation(i2c->fc, &r100); + } + if (ret != 0) { + deb_i2c("read failed. %d\n", ret); + return ret; + } + + buf[0] = r100.tw_sm_c_100.data1_reg; + + if (len > 0) { + r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104); + deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw); + + /* there is at least one more byte, otherwise we wouldn't be here */ + buf[1] = r104.tw_sm_c_104.data2_reg; + if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; + if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; + } + return 0; +} + +static int flexcop_i2c_write4(struct flexcop_device *fc, + flexcop_ibi_value r100, u8 *buf) +{ + flexcop_ibi_value r104; + int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ + r104.raw = 0; + + /* there is at least one byte, otherwise we wouldn't be here */ + r100.tw_sm_c_100.data1_reg = buf[0]; + r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; + r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; + r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; + + deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw); + + /* write the additional i2c data before doing the actual i2c operation */ + fc->write_ibi_reg(fc, tw_sm_c_104, r104); + return flexcop_i2c_operation(fc, &r100); +} + +int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c, + flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len) +{ + int ret; + +#ifdef DUMP_I2C_MESSAGES + int i; +#endif + + u16 bytes_to_transfer; + flexcop_ibi_value r100; + + deb_i2c("op = %d\n",op); + r100.raw = 0; + r100.tw_sm_c_100.chipaddr = chipaddr; + r100.tw_sm_c_100.twoWS_rw = op; + r100.tw_sm_c_100.twoWS_port_reg = i2c->port; + +#ifdef DUMP_I2C_MESSAGES + printk(KERN_DEBUG "%d ", i2c->port); + if (op == FC_READ) + printk("rd("); + else + printk("wr("); + printk("%02x): %02x ", chipaddr, addr); +#endif + + /* in that case addr is the only value -> + * we write it twice as baseaddr and val0 + * BBTI is doing it like that for ISL6421 at least */ + if (i2c->no_base_addr && len == 0 && op == FC_WRITE) { + buf = &addr; + len = 1; + } + + while (len != 0) { + bytes_to_transfer = len > 4 ? 4 : len; + + r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; + r100.tw_sm_c_100.baseaddr = addr; + + if (op == FC_READ) + ret = flexcop_i2c_read4(i2c, r100, buf); + else + ret = flexcop_i2c_write4(i2c->fc, r100, buf); + +#ifdef DUMP_I2C_MESSAGES + for (i = 0; i < bytes_to_transfer; i++) + printk("%02x ", buf[i]); +#endif + + if (ret < 0) + return ret; + + buf += bytes_to_transfer; + addr += bytes_to_transfer; + len -= bytes_to_transfer; + } + +#ifdef DUMP_I2C_MESSAGES + printk("\n"); +#endif + + return 0; +} +/* exported for PCI i2c */ +EXPORT_SYMBOL(flexcop_i2c_request); + +/* master xfer callback for demodulator */ +static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg msgs[], int num) +{ + struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap); + int i, ret = 0; + + /* Some drivers use 1 byte or 0 byte reads as probes, which this + * driver doesn't support. These probes will always fail, so this + * hack makes them always succeed. If one knew how, it would of + * course be better to actually do the read. */ + if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) + return 1; + + if (mutex_lock_interruptible(&i2c->fc->i2c_mutex)) + return -ERESTARTSYS; + + for (i = 0; i < num; i++) { + /* reading */ + if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) { + ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr, + msgs[i].buf[0], msgs[i+1].buf, + msgs[i+1].len); + i++; /* skip the following message */ + } else /* writing */ + ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr, + msgs[i].buf[0], &msgs[i].buf[1], + msgs[i].len - 1); + if (ret < 0) { + deb_i2c("i2c master_xfer failed"); + break; + } + } + + mutex_unlock(&i2c->fc->i2c_mutex); + + if (ret == 0) + ret = num; + return ret; +} + +static u32 flexcop_i2c_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C; +} + +static struct i2c_algorithm flexcop_algo = { + .master_xfer = flexcop_master_xfer, + .functionality = flexcop_i2c_func, +}; + +int flexcop_i2c_init(struct flexcop_device *fc) +{ + int ret; + mutex_init(&fc->i2c_mutex); + + fc->fc_i2c_adap[0].fc = fc; + fc->fc_i2c_adap[1].fc = fc; + fc->fc_i2c_adap[2].fc = fc; + fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD; + fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM; + fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER; + + strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod", + sizeof(fc->fc_i2c_adap[0].i2c_adap.name)); + strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom", + sizeof(fc->fc_i2c_adap[1].i2c_adap.name)); + strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner", + sizeof(fc->fc_i2c_adap[2].i2c_adap.name)); + + i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]); + i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]); + i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]); + + fc->fc_i2c_adap[0].i2c_adap.algo = + fc->fc_i2c_adap[1].i2c_adap.algo = + fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo; + fc->fc_i2c_adap[0].i2c_adap.algo_data = + fc->fc_i2c_adap[1].i2c_adap.algo_data = + fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL; + fc->fc_i2c_adap[0].i2c_adap.dev.parent = + fc->fc_i2c_adap[1].i2c_adap.dev.parent = + fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev; + + ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap); + if (ret < 0) + return ret; + + ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap); + if (ret < 0) + goto adap_1_failed; + + ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap); + if (ret < 0) + goto adap_2_failed; + + fc->init_state |= FC_STATE_I2C_INIT; + return 0; + +adap_2_failed: + i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); +adap_1_failed: + i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); + return ret; +} + +void flexcop_i2c_exit(struct flexcop_device *fc) +{ + if (fc->init_state & FC_STATE_I2C_INIT) { + i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap); + i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); + i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); + } + fc->init_state &= ~FC_STATE_I2C_INIT; +} |