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path: root/drivers/media/video/cx25821/cx25821-gpio.c
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Diffstat (limited to 'drivers/media/video/cx25821/cx25821-gpio.c')
-rw-r--r--drivers/media/video/cx25821/cx25821-gpio.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/media/video/cx25821/cx25821-gpio.c b/drivers/media/video/cx25821/cx25821-gpio.c
new file mode 100644
index 00000000000..29e43b03c85
--- /dev/null
+++ b/drivers/media/video/cx25821/cx25821-gpio.c
@@ -0,0 +1,98 @@
+/*
+ * Driver for the Conexant CX25821 PCIe bridge
+ *
+ * Copyright (C) 2009 Conexant Systems Inc.
+ * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.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, 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 "cx25821.h"
+
+/********************* GPIO stuffs *********************/
+void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
+ int pin_number, int pin_logic_value)
+{
+ int bit = pin_number;
+ u32 gpio_oe_reg = GPIO_LO_OE;
+ u32 gpio_register = 0;
+ u32 value = 0;
+
+ /* Check for valid pinNumber */
+ if (pin_number >= 47)
+ return;
+
+ if (pin_number > 31) {
+ bit = pin_number - 31;
+ gpio_oe_reg = GPIO_HI_OE;
+ }
+ /* Here we will make sure that the GPIOs 0 and 1 are output. keep the
+ * rest as is */
+ gpio_register = cx_read(gpio_oe_reg);
+
+ if (pin_logic_value == 1)
+ value = gpio_register | Set_GPIO_Bit(bit);
+ else
+ value = gpio_register & Clear_GPIO_Bit(bit);
+
+ cx_write(gpio_oe_reg, value);
+}
+EXPORT_SYMBOL(cx25821_set_gpiopin_direction);
+
+static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
+ int pin_number, int pin_logic_value)
+{
+ int bit = pin_number;
+ u32 gpio_reg = GPIO_LO;
+ u32 value = 0;
+
+ /* Check for valid pinNumber */
+ if (pin_number >= 47)
+ return;
+
+ /* change to output direction */
+ cx25821_set_gpiopin_direction(dev, pin_number, 0);
+
+ if (pin_number > 31) {
+ bit = pin_number - 31;
+ gpio_reg = GPIO_HI;
+ }
+
+ value = cx_read(gpio_reg);
+
+ if (pin_logic_value == 0)
+ value &= Clear_GPIO_Bit(bit);
+ else
+ value |= Set_GPIO_Bit(bit);
+
+ cx_write(gpio_reg, value);
+}
+
+void cx25821_gpio_init(struct cx25821_dev *dev)
+{
+ if (dev == NULL)
+ return;
+
+ switch (dev->board) {
+ case CX25821_BOARD_CONEXANT_ATHENA10:
+ default:
+ /* set GPIO 5 to select the path for Medusa/Athena */
+ cx25821_set_gpiopin_logicvalue(dev, 5, 1);
+ mdelay(20);
+ break;
+ }
+
+}