V4L/DVB (7786): cx18: new driver for the Conexant CX23418 MPEG encoder chip

Many thanks to Steve Toth from Hauppauge and Nattu Dakshinamurthy from
Conexant for their support. I am in particular thankful to Hauppauge
since without their help this driver would not exist. It should also
be noted that Steve did the work to get the DVB part up and running.
Thank you!

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: G. Andrew Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 431 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-i2c.c b/drivers/media/video/cx18/cx18-i2c.c
new file mode 100644
index 000000000000..18c88d1e4833
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-i2c.c
@@ -0,0 +1,431 @@
+/*
+ *  cx18 I2C functions
+ *
+ *  Derived from ivtv-i2c.c
+ *
+ *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ *  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-cards.h"
+#include "cx18-gpio.h"
+#include "cx18-av-core.h"
+
+#include <media/ir-kbd-i2c.h>
+
+#define CX18_REG_I2C_1_WR   0xf15000
+#define CX18_REG_I2C_1_RD   0xf15008
+#define CX18_REG_I2C_2_WR   0xf25100
+#define CX18_REG_I2C_2_RD   0xf25108
+
+#define SETSCL_BIT      0x0001
+#define SETSDL_BIT      0x0002
+#define GETSCL_BIT      0x0004
+#define GETSDL_BIT      0x0008
+
+#ifndef I2C_ADAP_CLASS_TV_ANALOG
+#define I2C_ADAP_CLASS_TV_ANALOG I2C_CLASS_TV_ANALOG
+#endif
+
+#define CX18_CS5345_I2C_ADDR            0x4c
+
+/* This array should match the CX18_HW_ defines */
+static const u8 hw_driverids[] = {
+        I2C_DRIVERID_TUNER,
+        I2C_DRIVERID_TVEEPROM,
+        I2C_DRIVERID_CS5345,
+        0,              /* CX18_HW_GPIO dummy driver ID */
+        0               /* CX18_HW_CX23418 dummy driver ID */
+};
+
+/* This array should match the CX18_HW_ defines */
+static const u8 hw_addrs[] = {
+        0,
+        0,
+        CX18_CS5345_I2C_ADDR,
+        0,              /* CX18_HW_GPIO dummy driver ID */
+        0,              /* CX18_HW_CX23418 dummy driver ID */
+};
+
+/* This array should match the CX18_HW_ defines */
+/* This might well become a card-specific array */
+static const u8 hw_bus[] = {
+        0,
+        0,
+        0,
+        0,              /* CX18_HW_GPIO dummy driver ID */
+        0,              /* CX18_HW_CX23418 dummy driver ID */
+};
+
+/* This array should match the CX18_HW_ defines */
+static const char * const hw_drivernames[] = {
+        "tuner",
+        "tveeprom",
+        "cs5345",
+        "gpio",
+        "cx23418",
+};
+
+int cx18_i2c_register(struct cx18 *cx, unsigned idx)
+{
+        struct i2c_board_info info;
+        struct i2c_client *c;
+        u8 id, bus;
+        int i;
+
+        CX18_DEBUG_I2C("i2c client register\n");
+        if (idx >= ARRAY_SIZE(hw_driverids) || hw_driverids[idx] == 0)
+                return -1;
+        id = hw_driverids[idx];
+        bus = hw_bus[idx];
+        memset(&info, 0, sizeof(info));
+        strlcpy(info.driver_name, hw_drivernames[idx],
+                        sizeof(info.driver_name));
+        info.addr = hw_addrs[idx];
+        for (i = 0; i < I2C_CLIENTS_MAX; i++)
+                if (cx->i2c_clients[i] == NULL)
+                        break;
+
+        if (i == I2C_CLIENTS_MAX) {
+                CX18_ERR("insufficient room for new I2C client!\n");
+                return -ENOMEM;
+        }
+
+        if (id != I2C_DRIVERID_TUNER) {
+                c = i2c_new_device(&cx->i2c_adap[bus], &info);
+                if (c->driver == NULL)
+                        i2c_unregister_device(c);
+                else
+                        cx->i2c_clients[i] = c;
+                return cx->i2c_clients[i] ? 0 : -ENODEV;
+        }
+
+        /* special tuner handling */
+        c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->radio);
+        if (c && c->driver == NULL)
+                i2c_unregister_device(c);
+        else if (c)
+                cx->i2c_clients[i++] = c;
+        c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->demod);
+        if (c && c->driver == NULL)
+                i2c_unregister_device(c);
+        else if (c)
+                cx->i2c_clients[i++] = c;
+        c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->tv);
+        if (c && c->driver == NULL)
+                i2c_unregister_device(c);
+        else if (c)
+                cx->i2c_clients[i++] = c;
+        return 0;
+}
+
+static int attach_inform(struct i2c_client *client)
+{
+        return 0;
+}
+
+static int detach_inform(struct i2c_client *client)
+{
+        int i;
+        struct cx18 *cx = (struct cx18 *)i2c_get_adapdata(client->adapter);
+
+        CX18_DEBUG_I2C("i2c client detach\n");
+        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
+                if (cx->i2c_clients[i] == client) {
+                        cx->i2c_clients[i] = NULL;
+                        break;
+                }
+        }
+        CX18_DEBUG_I2C("i2c detach [client=%s,%s]\n",
+                   client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed");
+
+        return 0;
+}
+
+static void cx18_setscl(void *data, int state)
+{
+        struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
+        int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
+        u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
+        u32 r = read_reg(addr);
+
+        if (state)
+                write_reg_sync(r | SETSCL_BIT, addr);
+        else
+                write_reg_sync(r & ~SETSCL_BIT, addr);
+}
+
+static void cx18_setsda(void *data, int state)
+{
+        struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
+        int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
+        u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
+        u32 r = read_reg(addr);
+
+        if (state)
+                write_reg_sync(r | SETSDL_BIT, addr);
+        else
+                write_reg_sync(r & ~SETSDL_BIT, addr);
+}
+
+static int cx18_getscl(void *data)
+{
+        struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
+        int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
+        u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
+
+        return read_reg(addr) & GETSCL_BIT;
+}
+
+static int cx18_getsda(void *data)
+{
+        struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
+        int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
+        u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
+
+        return read_reg(addr) & GETSDL_BIT;
+}
+
+/* template for i2c-bit-algo */
+static struct i2c_adapter cx18_i2c_adap_template = {
+        .name = "cx18 i2c driver",
+        .id = I2C_HW_B_CX2341X,
+        .algo = NULL,                   /* set by i2c-algo-bit */
+        .algo_data = NULL,              /* filled from template */
+        .client_register = attach_inform,
+        .client_unregister = detach_inform,
+        .owner = THIS_MODULE,
+};
+
+#define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
+#define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
+
+static struct i2c_algo_bit_data cx18_i2c_algo_template = {
+        .setsda         = cx18_setsda,
+        .setscl         = cx18_setscl,
+        .getsda         = cx18_getsda,
+        .getscl         = cx18_getscl,
+        .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
+        .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
+};
+
+static struct i2c_client cx18_i2c_client_template = {
+        .name = "cx18 internal",
+};
+
+int cx18_call_i2c_client(struct cx18 *cx, int addr, unsigned cmd, void *arg)
+{
+        struct i2c_client *client;
+        int retval;
+        int i;
+
+        CX18_DEBUG_I2C("call_i2c_client addr=%02x\n", addr);
+        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
+                client = cx->i2c_clients[i];
+                if (client == NULL || client->driver == NULL ||
+                                client->driver->command == NULL)
+                        continue;
+                if (addr == client->addr) {
+                        retval = client->driver->command(client, cmd, arg);
+                        return retval;
+                }
+        }
+        if (cmd != VIDIOC_G_CHIP_IDENT)
+                CX18_ERR("i2c addr 0x%02x not found for cmd 0x%x!\n",
+                               addr, cmd);
+        return -ENODEV;
+}
+
+/* Find the i2c device based on the driver ID and return
+   its i2c address or -ENODEV if no matching device was found. */
+static int cx18_i2c_id_addr(struct cx18 *cx, u32 id)
+{
+        struct i2c_client *client;
+        int retval = -ENODEV;
+        int i;
+
+        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
+                client = cx->i2c_clients[i];
+                if (client == NULL || client->driver == NULL)
+                        continue;
+                if (id == client->driver->id) {
+                        retval = client->addr;
+                        break;
+                }
+        }
+        return retval;
+}
+
+/* Find the i2c device name matching the DRIVERID */
+static const char *cx18_i2c_id_name(u32 id)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
+                if (hw_driverids[i] == id)
+                        return hw_drivernames[i];
+        return "unknown device";
+}
+
+/* Find the i2c device name matching the CX18_HW_ flag */
+static const char *cx18_i2c_hw_name(u32 hw)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
+                if (1 << i == hw)
+                        return hw_drivernames[i];
+        return "unknown device";
+}
+
+/* Find the i2c device matching the CX18_HW_ flag and return
+   its i2c address or -ENODEV if no matching device was found. */
+int cx18_i2c_hw_addr(struct cx18 *cx, u32 hw)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
+                if (1 << i == hw)
+                        return cx18_i2c_id_addr(cx, hw_driverids[i]);
+        return -ENODEV;
+}
+
+/* Calls i2c device based on CX18_HW_ flag. If hw == 0, then do nothing.
+   If hw == CX18_HW_GPIO then call the gpio handler. */
+int cx18_i2c_hw(struct cx18 *cx, u32 hw, unsigned int cmd, void *arg)
+{
+        int addr;
+
+        if (hw == CX18_HW_GPIO || hw == 0)
+                return 0;
+        if (hw == CX18_HW_CX23418)
+                return cx18_av_cmd(cx, cmd, arg);
+
+        addr = cx18_i2c_hw_addr(cx, hw);
+        if (addr < 0) {
+                CX18_ERR("i2c hardware 0x%08x (%s) not found for cmd 0x%x!\n",
+                               hw, cx18_i2c_hw_name(hw), cmd);
+                return addr;
+        }
+        return cx18_call_i2c_client(cx, addr, cmd, arg);
+}
+
+/* Calls i2c device based on I2C driver ID. */
+int cx18_i2c_id(struct cx18 *cx, u32 id, unsigned int cmd, void *arg)
+{
+        int addr;
+
+        addr = cx18_i2c_id_addr(cx, id);
+        if (addr < 0) {
+                if (cmd != VIDIOC_G_CHIP_IDENT)
+                        CX18_ERR("i2c ID 0x%08x (%s) not found for cmd 0x%x!\n",
+                                id, cx18_i2c_id_name(id), cmd);
+                return addr;
+        }
+        return cx18_call_i2c_client(cx, addr, cmd, arg);
+}
+
+/* broadcast cmd for all I2C clients and for the gpio subsystem */
+void cx18_call_i2c_clients(struct cx18 *cx, unsigned int cmd, void *arg)
+{
+        if (cx->i2c_adap[0].algo == NULL || cx->i2c_adap[1].algo == NULL) {
+                CX18_ERR("adapter is not set\n");
+                return;
+        }
+        cx18_av_cmd(cx, cmd, arg);
+        i2c_clients_command(&cx->i2c_adap[0], cmd, arg);
+        i2c_clients_command(&cx->i2c_adap[1], cmd, arg);
+}
+
+/* init + register i2c algo-bit adapter */
+int init_cx18_i2c(struct cx18 *cx)
+{
+        int i;
+        CX18_DEBUG_I2C("i2c init\n");
+
+        for (i = 0; i < 2; i++) {
+                memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
+                        sizeof(struct i2c_adapter));
+                memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
+                        sizeof(struct i2c_algo_bit_data));
+                cx->i2c_algo_cb_data[i].cx = cx;
+                cx->i2c_algo_cb_data[i].bus_index = i;
+                cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
+                cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
+
+                sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
+                                " #%d-%d", cx->num, i);
+                i2c_set_adapdata(&cx->i2c_adap[i], cx);
+
+                memcpy(&cx->i2c_client[i], &cx18_i2c_client_template,
+                        sizeof(struct i2c_client));
+                sprintf(cx->i2c_client[i].name +
+                                strlen(cx->i2c_client[i].name), "%d", i);
+                cx->i2c_client[i].adapter = &cx->i2c_adap[i];
+                cx->i2c_adap[i].dev.parent = &cx->dev->dev;
+        }
+
+        if (read_reg(CX18_REG_I2C_2_WR) != 0x0003c02f) {
+                /* Reset/Unreset I2C hardware block */
+                write_reg(0x10000000, 0xc71004); /* Clock select 220MHz */
+                write_reg_sync(0x10001000, 0xc71024); /* Clock Enable */
+        }
+        /* courtesy of Steven Toth <stoth@hauppauge.com> */
+        write_reg_sync(0x00c00000, 0xc7001c);
+        mdelay(10);
+        write_reg_sync(0x00c000c0, 0xc7001c);
+        mdelay(10);
+        write_reg_sync(0x00c00000, 0xc7001c);
+
+        write_reg_sync(0x00c00000, 0xc730c8); /* Set to edge-triggered intrs. */
+        write_reg_sync(0x00c00000, 0xc730c4); /* Clear any stale intrs */
+
+        /* Hw I2C1 Clock Freq ~100kHz */
+        write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_1_WR);
+        cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
+        cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
+
+        /* Hw I2C2 Clock Freq ~100kHz */
+        write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_2_WR);
+        cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
+        cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
+
+        return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
+                i2c_bit_add_bus(&cx->i2c_adap[1]);
+}
+
+void exit_cx18_i2c(struct cx18 *cx)
+{
+        int i;
+        CX18_DEBUG_I2C("i2c exit\n");
+        write_reg(read_reg(CX18_REG_I2C_1_WR) | 4, CX18_REG_I2C_1_WR);
+        write_reg(read_reg(CX18_REG_I2C_2_WR) | 4, CX18_REG_I2C_2_WR);
+
+        for (i = 0; i < 2; i++) {
+                i2c_del_adapter(&cx->i2c_adap[i]);
+        }
+}
+
+/*
+   Hauppauge HVR1600 should have:
+   32 cx24227
+   98 unknown
+   a0 eeprom
+   c2 tuner
+   e? zilog ir
+   */