1 files changed, 347 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-gpio.c b/drivers/media/video/cx18/cx18-gpio.c
new file mode 100644
index 00000000000..5374aeb0cd2
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-gpio.c
@@ -0,0 +1,347 @@
+/*
+ *  cx18 gpio functions
+ *
+ *  Derived from ivtv-gpio.c
+ *
+ *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
+ *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
+ *
+ *  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
+ */
+
+#include "cx18-driver.h"
+#include "cx18-io.h"
+#include "cx18-cards.h"
+#include "cx18-gpio.h"
+#include "tuner-xc2028.h"
+
+/********************* GPIO stuffs *********************/
+
+/* GPIO registers */
+#define CX18_REG_GPIO_IN     0xc72010
+#define CX18_REG_GPIO_OUT1   0xc78100
+#define CX18_REG_GPIO_DIR1   0xc78108
+#define CX18_REG_GPIO_OUT2   0xc78104
+#define CX18_REG_GPIO_DIR2   0xc7810c
+
+/*
+ * HVR-1600 GPIO pins, courtesy of Hauppauge:
+ *
+ * gpio0: zilog ir process reset pin
+ * gpio1: zilog programming pin (you should never use this)
+ * gpio12: cx24227 reset pin
+ * gpio13: cs5345 reset pin
+*/
+
+/*
+ * File scope utility functions
+ */
+static void gpio_write(struct cx18 *cx)
+{
+        u32 dir_lo = cx->gpio_dir & 0xffff;
+        u32 val_lo = cx->gpio_val & 0xffff;
+        u32 dir_hi = cx->gpio_dir >> 16;
+        u32 val_hi = cx->gpio_val >> 16;
+
+        cx18_write_reg_expect(cx, dir_lo << 16,
+                                        CX18_REG_GPIO_DIR1, ~dir_lo, dir_lo);
+        cx18_write_reg_expect(cx, (dir_lo << 16) | val_lo,
+                                        CX18_REG_GPIO_OUT1, val_lo, dir_lo);
+        cx18_write_reg_expect(cx, dir_hi << 16,
+                                        CX18_REG_GPIO_DIR2, ~dir_hi, dir_hi);
+        cx18_write_reg_expect(cx, (dir_hi << 16) | val_hi,
+                                        CX18_REG_GPIO_OUT2, val_hi, dir_hi);
+}
+
+static void gpio_update(struct cx18 *cx, u32 mask, u32 data)
+{
+        if (mask == 0)
+                return;
+
+        mutex_lock(&cx->gpio_lock);
+        cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask);
+        gpio_write(cx);
+        mutex_unlock(&cx->gpio_lock);
+}
+
+static void gpio_reset_seq(struct cx18 *cx, u32 active_lo, u32 active_hi,
+                           unsigned int assert_msecs,
+                           unsigned int recovery_msecs)
+{
+        u32 mask;
+
+        mask = active_lo | active_hi;
+        if (mask == 0)
+                return;
+
+        /*
+         * Assuming that active_hi and active_lo are a subsets of the bits in
+         * gpio_dir.  Also assumes that active_lo and active_hi don't overlap
+         * in any bit position
+         */
+
+        /* Assert */
+        gpio_update(cx, mask, ~active_lo);
+        schedule_timeout_uninterruptible(msecs_to_jiffies(assert_msecs));
+
+        /* Deassert */
+        gpio_update(cx, mask, ~active_hi);
+        schedule_timeout_uninterruptible(msecs_to_jiffies(recovery_msecs));
+}
+
+/*
+ * GPIO Multiplexer - logical device
+ */
+static int gpiomux_log_status(struct v4l2_subdev *sd)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+
+        mutex_lock(&cx->gpio_lock);
+        CX18_INFO_DEV(sd, "GPIO:  direction 0x%08x, value 0x%08x\n",
+                      cx->gpio_dir, cx->gpio_val);
+        mutex_unlock(&cx->gpio_lock);
+        return 0;
+}
+
+static int gpiomux_s_radio(struct v4l2_subdev *sd)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+
+        /*
+         * FIXME - work out the cx->active/audio_input mess - this is
+         * intended to handle the switch to radio mode and set the
+         * audio routing, but we need to update the state in cx
+         */
+        gpio_update(cx, cx->card->gpio_audio_input.mask,
+                        cx->card->gpio_audio_input.radio);
+        return 0;
+}
+
+static int gpiomux_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+        u32 data;
+
+        switch (cx->card->audio_inputs[cx->audio_input].muxer_input) {
+        case 1:
+                data = cx->card->gpio_audio_input.linein;
+                break;
+        case 0:
+                data = cx->card->gpio_audio_input.tuner;
+                break;
+        default:
+                /*
+                 * FIXME - work out the cx->active/audio_input mess - this is
+                 * intended to handle the switch from radio mode and set the
+                 * audio routing, but we need to update the state in cx
+                 */
+                data = cx->card->gpio_audio_input.tuner;
+                break;
+        }
+        gpio_update(cx, cx->card->gpio_audio_input.mask, data);
+        return 0;
+}
+
+static int gpiomux_s_audio_routing(struct v4l2_subdev *sd,
+                                   u32 input, u32 output, u32 config)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+        u32 data;
+
+        switch (input) {
+        case 0:
+                data = cx->card->gpio_audio_input.tuner;
+                break;
+        case 1:
+                data = cx->card->gpio_audio_input.linein;
+                break;
+        case 2:
+                data = cx->card->gpio_audio_input.radio;
+                break;
+        default:
+                return -EINVAL;
+        }
+        gpio_update(cx, cx->card->gpio_audio_input.mask, data);
+        return 0;
+}
+
+static const struct v4l2_subdev_core_ops gpiomux_core_ops = {
+        .log_status = gpiomux_log_status,
+        .s_std = gpiomux_s_std,
+};
+
+static const struct v4l2_subdev_tuner_ops gpiomux_tuner_ops = {
+        .s_radio = gpiomux_s_radio,
+};
+
+static const struct v4l2_subdev_audio_ops gpiomux_audio_ops = {
+        .s_routing = gpiomux_s_audio_routing,
+};
+
+static const struct v4l2_subdev_ops gpiomux_ops = {
+        .core = &gpiomux_core_ops,
+        .tuner = &gpiomux_tuner_ops,
+        .audio = &gpiomux_audio_ops,
+};
+
+/*
+ * GPIO Reset Controller - logical device
+ */
+static int resetctrl_log_status(struct v4l2_subdev *sd)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+
+        mutex_lock(&cx->gpio_lock);
+        CX18_INFO_DEV(sd, "GPIO:  direction 0x%08x, value 0x%08x\n",
+                      cx->gpio_dir, cx->gpio_val);
+        mutex_unlock(&cx->gpio_lock);
+        return 0;
+}
+
+static int resetctrl_reset(struct v4l2_subdev *sd, u32 val)
+{
+        struct cx18 *cx = v4l2_get_subdevdata(sd);
+        const struct cx18_gpio_i2c_slave_reset *p;
+
+        p = &cx->card->gpio_i2c_slave_reset;
+        switch (val) {
+        case CX18_GPIO_RESET_I2C:
+                gpio_reset_seq(cx, p->active_lo_mask, p->active_hi_mask,
+                               p->msecs_asserted, p->msecs_recovery);
+                break;
+        case CX18_GPIO_RESET_Z8F0811:
+                /*
+                 * Assert timing for the Z8F0811 on HVR-1600 boards:
+                 * 1. Assert RESET for min of 4 clock cycles at 18.432 MHz to
+                 *    initiate
+                 * 2. Reset then takes 66 WDT cycles at 10 kHz + 16 xtal clock
+                 *    cycles (6,601,085 nanoseconds ~= 7 milliseconds)
+                 * 3. DBG pin must be high before chip exits reset for normal
+                 *    operation.  DBG is open drain and hopefully pulled high
+                 *    since we don't normally drive it (GPIO 1?) for the
+                 *    HVR-1600
+                 * 4. Z8F0811 won't exit reset until RESET is deasserted
+                 * 5. Zilog comes out of reset, loads reset vector address and
+                 *    executes from there. Required recovery delay unknown.
+                 */
+                gpio_reset_seq(cx, p->ir_reset_mask, 0,
+                               p->msecs_asserted, p->msecs_recovery);
+                break;
+        case CX18_GPIO_RESET_XC2028:
+                if (cx->card->tuners[0].tuner == TUNER_XC2028)
+                        gpio_reset_seq(cx, (1 << cx->card->xceive_pin), 0,
+                                       1, 1);
+                break;
+        }
+        return 0;
+}
+
+static const struct v4l2_subdev_core_ops resetctrl_core_ops = {
+        .log_status = resetctrl_log_status,
+        .reset = resetctrl_reset,
+};
+
+static const struct v4l2_subdev_ops resetctrl_ops = {
+        .core = &resetctrl_core_ops,
+};
+
+/*
+ * External entry points
+ */
+void cx18_gpio_init(struct cx18 *cx)
+{
+        mutex_lock(&cx->gpio_lock);
+        cx->gpio_dir = cx->card->gpio_init.direction;
+        cx->gpio_val = cx->card->gpio_init.initial_value;
+
+        if (cx->card->tuners[0].tuner == TUNER_XC2028) {
+                cx->gpio_dir |= 1 << cx->card->xceive_pin;
+                cx->gpio_val |= 1 << cx->card->xceive_pin;
+        }
+
+        if (cx->gpio_dir == 0) {
+                mutex_unlock(&cx->gpio_lock);
+                return;
+        }
+
+        CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n",
+                        cx18_read_reg(cx, CX18_REG_GPIO_DIR1),
+                        cx18_read_reg(cx, CX18_REG_GPIO_DIR2),
+                        cx18_read_reg(cx, CX18_REG_GPIO_OUT1),
+                        cx18_read_reg(cx, CX18_REG_GPIO_OUT2));
+
+        gpio_write(cx);
+        mutex_unlock(&cx->gpio_lock);
+}
+
+int cx18_gpio_register(struct cx18 *cx, u32 hw)
+{
+        struct v4l2_subdev *sd;
+        const struct v4l2_subdev_ops *ops;
+        char *str;
+
+        switch (hw) {
+        case CX18_HW_GPIO_MUX:
+                sd = &cx->sd_gpiomux;
+                ops = &gpiomux_ops;
+                str = "gpio-mux";
+                break;
+        case CX18_HW_GPIO_RESET_CTRL:
+                sd = &cx->sd_resetctrl;
+                ops = &resetctrl_ops;
+                str = "gpio-reset-ctrl";
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        v4l2_subdev_init(sd, ops);
+        v4l2_set_subdevdata(sd, cx);
+        snprintf(sd->name, sizeof(sd->name), "%s %s", cx->v4l2_dev.name, str);
+        sd->grp_id = hw;
+        return v4l2_device_register_subdev(&cx->v4l2_dev, sd);
+}
+
+void cx18_reset_ir_gpio(void *data)
+{
+        struct cx18 *cx = to_cx18((struct v4l2_device *)data);
+
+        if (cx->card->gpio_i2c_slave_reset.ir_reset_mask == 0)
+                return;
+
+        CX18_DEBUG_INFO("Resetting IR microcontroller\n");
+
+        v4l2_subdev_call(&cx->sd_resetctrl,
+                         core, reset, CX18_GPIO_RESET_Z8F0811);
+}
+EXPORT_SYMBOL(cx18_reset_ir_gpio);
+/* This symbol is exported for use by lirc_pvr150 for the IR-blaster */
+
+/* Xceive tuner reset function */
+int cx18_reset_tuner_gpio(void *dev, int component, int cmd, int value)
+{
+        struct i2c_algo_bit_data *algo = dev;
+        struct cx18_i2c_algo_callback_data *cb_data = algo->data;
+        struct cx18 *cx = cb_data->cx;
+
+        if (cmd != XC2028_TUNER_RESET ||
+            cx->card->tuners[0].tuner != TUNER_XC2028)
+                return 0;
+
+        CX18_DEBUG_INFO("Resetting XCeive tuner\n");
+        return v4l2_subdev_call(&cx->sd_resetctrl,
+                                core, reset, CX18_GPIO_RESET_XC2028);
+}