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path: root/drivers/media/pci/cx23885/cx23885-f300.c
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Diffstat (limited to 'drivers/media/pci/cx23885/cx23885-f300.c')
-rw-r--r--drivers/media/pci/cx23885/cx23885-f300.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/media/pci/cx23885/cx23885-f300.c b/drivers/media/pci/cx23885/cx23885-f300.c
new file mode 100644
index 0000000000..ac1c434e8e
--- /dev/null
+++ b/drivers/media/pci/cx23885/cx23885-f300.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#include "cx23885.h"
+#include "cx23885-f300.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) {
+ pr_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, enum fe_sec_voltage 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);
+}