diff options
Diffstat (limited to 'drivers/media/video/cx23885/cx23885-f300.c')
| -rw-r--r-- | drivers/media/video/cx23885/cx23885-f300.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/media/video/cx23885/cx23885-f300.c b/drivers/media/video/cx23885/cx23885-f300.c new file mode 100644 index 00000000000..93998f22098 --- /dev/null +++ b/drivers/media/video/cx23885/cx23885-f300.c @@ -0,0 +1,177 @@ +/* + * Driver for Silicon Labs C8051F300 microcontroller. + * + * It is used for LNB power control in TeVii S470, + * TBS 6920 PCIe DVB-S2 cards. + * + * Microcontroller connected to cx23885 GPIO pins: + * GPIO0 - data - P0.3 F300 + * GPIO1 - reset - P0.2 F300 + * GPIO2 - clk - P0.1 F300 + * GPIO3 - busy - P0.0 F300 + * + * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by> + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include "cx23885.h" + +#define F300_DATA GPIO_0 +#define F300_RESET GPIO_1 +#define F300_CLK GPIO_2 +#define F300_BUSY GPIO_3 + +static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl) +{ + cx23885_gpio_enable(dev, line, 1); + if (lvl == 1) + cx23885_gpio_set(dev, line); + else + cx23885_gpio_clear(dev, line); +} + +static u8 f300_get_line(struct cx23885_dev *dev, u32 line) +{ + cx23885_gpio_enable(dev, line, 0); + + return cx23885_gpio_get(dev, line); +} + +static void f300_send_byte(struct cx23885_dev *dev, u8 dta) +{ + u8 i; + + for (i = 0; i < 8; i++) { + f300_set_line(dev, F300_CLK, 0); + udelay(30); + f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */ + udelay(30); + dta <<= 1; + f300_set_line(dev, F300_CLK, 1); + udelay(30); + } +} + +static u8 f300_get_byte(struct cx23885_dev *dev) +{ + u8 i, dta = 0; + + for (i = 0; i < 8; i++) { + f300_set_line(dev, F300_CLK, 0); + udelay(30); + dta <<= 1; + f300_set_line(dev, F300_CLK, 1); + udelay(30); + dta |= f300_get_line(dev, F300_DATA);/* msb first */ + + } + + return dta; +} + +static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf) +{ + struct cx23885_tsport *port = fe->dvb->priv; + struct cx23885_dev *dev = port->dev; + u8 i, temp, ret = 0; + + temp = buf[0]; + for (i = 0; i < buf[0]; i++) + temp += buf[i + 1]; + temp = (~temp + 1);/* get check sum */ + buf[1 + buf[0]] = temp; + + f300_set_line(dev, F300_RESET, 1); + f300_set_line(dev, F300_CLK, 1); + udelay(30); + f300_set_line(dev, F300_DATA, 1); + msleep(1); + + /* question: */ + f300_set_line(dev, F300_RESET, 0);/* begin to send data */ + msleep(1); + + f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */ + msleep(1); + + temp = buf[0]; + temp += 2; + for (i = 0; i < temp; i++) + f300_send_byte(dev, buf[i]); + + f300_set_line(dev, F300_RESET, 1);/* sent data over */ + f300_set_line(dev, F300_DATA, 1); + + /* answer: */ + temp = 0; + for (i = 0; ((i < 8) & (temp == 0)); i++) { + msleep(1); + if (f300_get_line(dev, F300_BUSY) == 0) + temp = 1; + } + + if (i > 7) { + printk(KERN_ERR "%s: timeout, the slave no response\n", + __func__); + ret = 1; /* timeout, the slave no response */ + } else { /* the slave not busy, prepare for getting data */ + f300_set_line(dev, F300_RESET, 0);/*ready...*/ + msleep(1); + f300_send_byte(dev, 0xe1);/* 0xe1 is Read */ + msleep(1); + temp = f300_get_byte(dev);/*get the data length */ + if (temp > 14) + temp = 14; + + for (i = 0; i < (temp + 1); i++) + f300_get_byte(dev);/* get data to empty buffer */ + + f300_set_line(dev, F300_RESET, 1);/* received data over */ + f300_set_line(dev, F300_DATA, 1); + } + + return ret; +} + +int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) +{ + u8 buf[16]; + + buf[0] = 0x05; + buf[1] = 0x38;/* write port */ + buf[2] = 0x01;/* A port, lnb power */ + + switch (voltage) { + case SEC_VOLTAGE_13: + buf[3] = 0x01;/* power on */ + buf[4] = 0x02;/* B port, H/V */ + buf[5] = 0x00;/*13V v*/ + break; + case SEC_VOLTAGE_18: + buf[3] = 0x01; + buf[4] = 0x02; + buf[5] = 0x01;/* 18V h*/ + break; + case SEC_VOLTAGE_OFF: + buf[3] = 0x00;/* power off */ + buf[4] = 0x00; + buf[5] = 0x00; + break; + } + + return f300_xfer(fe, buf); +} |