V4L/DVB(7767): Move tuners to common/tuners

There were several issues in the past, caused by the hybrid tuner design, since
now, the same tuner can be used by drivers/media/dvb and drivers/media/video.

Kconfig items were rearranged, to split V4L/DVB core from their drivers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/media/common/tuners/tuner-i2c.h b/drivers/media/common/tuners/tuner-i2c.h
new file mode 100644
index 000000000000..3ad6c8e0b04c
--- /dev/null
+++ b/drivers/media/common/tuners/tuner-i2c.h
@@ -0,0 +1,173 @@
+/*
+    tuner-i2c.h - i2c interface for different tuners
+
+    Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org)
+
+    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.
+*/
+
+#ifndef __TUNER_I2C_H__
+#define __TUNER_I2C_H__
+
+#include <linux/i2c.h>
+
+struct tuner_i2c_props {
+        u8 addr;
+        struct i2c_adapter *adap;
+
+        /* used for tuner instance management */
+        int count;
+        char *name;
+};
+
+static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
+{
+        struct i2c_msg msg = { .addr = props->addr, .flags = 0,
+                               .buf = buf, .len = len };
+        int ret = i2c_transfer(props->adap, &msg, 1);
+
+        return (ret == 1) ? len : ret;
+}
+
+static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
+{
+        struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
+                               .buf = buf, .len = len };
+        int ret = i2c_transfer(props->adap, &msg, 1);
+
+        return (ret == 1) ? len : ret;
+}
+
+static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
+                                           char *obuf, int olen,
+                                           char *ibuf, int ilen)
+{
+        struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
+                                    .buf = obuf, .len = olen },
+                                  { .addr = props->addr, .flags = I2C_M_RD,
+                                    .buf = ibuf, .len = ilen } };
+        int ret = i2c_transfer(props->adap, msg, 2);
+
+        return (ret == 2) ? ilen : ret;
+}
+
+/* Callers must declare as a global for the module:
+ *
+ * static LIST_HEAD(hybrid_tuner_instance_list);
+ *
+ * hybrid_tuner_instance_list should be the third argument
+ * passed into hybrid_tuner_request_state().
+ *
+ * state structure must contain the following:
+ *
+ *      struct list_head        hybrid_tuner_instance_list;
+ *      struct tuner_i2c_props  i2c_props;
+ *
+ * hybrid_tuner_instance_list (both within state structure and globally)
+ * is only required if the driver is using hybrid_tuner_request_state
+ * and hybrid_tuner_release_state to manage state sharing between
+ * multiple instances of hybrid tuners.
+ */
+
+#define tuner_printk(kernlvl, i2cprops, fmt, arg...) do {               \
+        printk(kernlvl "%s %d-%04x: " fmt, i2cprops.name,               \
+                        i2cprops.adap ?                                 \
+                                i2c_adapter_id(i2cprops.adap) : -1,     \
+                        i2cprops.addr, ##arg);                          \
+         } while (0)
+
+/* TO DO: convert all callers of these macros to pass in
+ * struct tuner_i2c_props, then remove the macro wrappers */
+
+#define __tuner_warn(i2cprops, fmt, arg...) do {                        \
+        tuner_printk(KERN_WARNING, i2cprops, fmt, ##arg);               \
+        } while (0)
+
+#define __tuner_info(i2cprops, fmt, arg...) do {                        \
+        tuner_printk(KERN_INFO, i2cprops, fmt, ##arg);                  \
+        } while (0)
+
+#define __tuner_err(i2cprops, fmt, arg...) do {                         \
+        tuner_printk(KERN_ERR, i2cprops, fmt, ##arg);                   \
+        } while (0)
+
+#define __tuner_dbg(i2cprops, fmt, arg...) do {                         \
+        if ((debug))                                                    \
+                tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg);         \
+        } while (0)
+
+#define tuner_warn(fmt, arg...) __tuner_warn(priv->i2c_props, fmt, ##arg)
+#define tuner_info(fmt, arg...) __tuner_info(priv->i2c_props, fmt, ##arg)
+#define tuner_err(fmt, arg...) __tuner_err(priv->i2c_props, fmt, ##arg)
+#define tuner_dbg(fmt, arg...) __tuner_dbg(priv->i2c_props, fmt, ##arg)
+
+/****************************************************************************/
+
+/* The return value of hybrid_tuner_request_state indicates the number of
+ * instances using this tuner object.
+ *
+ * 0 - no instances, indicates an error - kzalloc must have failed
+ *
+ * 1 - one instance, indicates that the tuner object was created successfully
+ *
+ * 2 (or more) instances, indicates that an existing tuner object was found
+ */
+
+#define hybrid_tuner_request_state(type, state, list, i2cadap, i2caddr, devname)\
+({                                                                      \
+        int __ret = 0;                                                  \
+        list_for_each_entry(state, &list, hybrid_tuner_instance_list) { \
+                if (((i2cadap) && (state->i2c_props.adap)) &&           \
+                    ((i2c_adapter_id(state->i2c_props.adap) ==          \
+                      i2c_adapter_id(i2cadap)) &&                       \
+                     (i2caddr == state->i2c_props.addr))) {             \
+                        __tuner_info(state->i2c_props,                  \
+                                     "attaching existing instance\n");  \
+                        state->i2c_props.count++;                       \
+                        __ret = state->i2c_props.count;                 \
+                        break;                                          \
+                }                                                       \
+        }                                                               \
+        if (0 == __ret) {                                               \
+                state = kzalloc(sizeof(type), GFP_KERNEL);              \
+                if (NULL == state)                                      \
+                        goto __fail;                                    \
+                state->i2c_props.addr = i2caddr;                        \
+                state->i2c_props.adap = i2cadap;                        \
+                state->i2c_props.name = devname;                        \
+                __tuner_info(state->i2c_props,                          \
+                             "creating new instance\n");                \
+                list_add_tail(&state->hybrid_tuner_instance_list, &list);\
+                state->i2c_props.count++;                               \
+                __ret = state->i2c_props.count;                         \
+        }                                                               \
+__fail:                                                                 \
+        __ret;                                                          \
+})
+
+#define hybrid_tuner_release_state(state)                               \
+({                                                                      \
+        int __ret;                                                      \
+        state->i2c_props.count--;                                       \
+        __ret = state->i2c_props.count;                                 \
+        if (!state->i2c_props.count) {                                  \
+                __tuner_info(state->i2c_props, "destroying instance\n");\
+                list_del(&state->hybrid_tuner_instance_list);           \
+                kfree(state);                                           \
+        }                                                               \
+        __ret;                                                          \
+})
+
+#endif /* __TUNER_I2C_H__ */