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path: root/drivers/media/usb/cx231xx/cx231xx-i2c.c
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Diffstat (limited to 'drivers/media/usb/cx231xx/cx231xx-i2c.c')
-rw-r--r--drivers/media/usb/cx231xx/cx231xx-i2c.c532
1 files changed, 532 insertions, 0 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
new file mode 100644
index 000000000000..781feed406f7
--- /dev/null
+++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
@@ -0,0 +1,532 @@
+/*
+ cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
+
+ Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+ Based on em28xx driver
+ Based on Cx23885 driver
+
+ 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 <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <media/v4l2-common.h>
+#include <media/tuner.h>
+
+#include "cx231xx.h"
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_scan;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk1(lvl, fmt, args...) \
+do { \
+ if (i2c_debug >= lvl) { \
+ printk(fmt, ##args); \
+ } \
+} while (0)
+
+#define dprintk2(lvl, fmt, args...) \
+do { \
+ if (i2c_debug >= lvl) { \
+ printk(KERN_DEBUG "%s at %s: " fmt, \
+ dev->name, __func__ , ##args); \
+ } \
+} while (0)
+
+static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
+ const struct i2c_msg *msg, int tuner_type)
+{
+ if (bus->nr != dev->board.tuner_i2c_master)
+ return false;
+
+ if (msg->addr != dev->board.tuner_addr)
+ return false;
+
+ if (dev->tuner_type != tuner_type)
+ return false;
+
+ return true;
+}
+
+/*
+ * cx231xx_i2c_send_bytes()
+ */
+int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg)
+{
+ struct cx231xx_i2c *bus = i2c_adap->algo_data;
+ struct cx231xx *dev = bus->dev;
+ struct cx231xx_i2c_xfer_data req_data;
+ int status = 0;
+ u16 size = 0;
+ u8 loop = 0;
+ u8 saddr_len = 1;
+ u8 *buf_ptr = NULL;
+ u16 saddr = 0;
+ u8 need_gpio = 0;
+
+ if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+ size = msg->len;
+
+ if (size == 2) { /* register write sub addr */
+ /* Just writing sub address will cause problem
+ * to XC5000. So ignore the request */
+ return 0;
+ } else if (size == 4) { /* register write with sub addr */
+ if (msg->len >= 2)
+ saddr = msg->buf[0] << 8 | msg->buf[1];
+ else if (msg->len == 1)
+ saddr = msg->buf[0];
+
+ switch (saddr) {
+ case 0x0000: /* start tuner calibration mode */
+ need_gpio = 1;
+ /* FW Loading is done */
+ dev->xc_fw_load_done = 1;
+ break;
+ case 0x000D: /* Set signal source */
+ case 0x0001: /* Set TV standard - Video */
+ case 0x0002: /* Set TV standard - Audio */
+ case 0x0003: /* Set RF Frequency */
+ need_gpio = 1;
+ break;
+ default:
+ if (dev->xc_fw_load_done)
+ need_gpio = 1;
+ break;
+ }
+
+ if (need_gpio) {
+ dprintk1(1,
+ "GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
+ msg->addr, msg->len, saddr);
+
+ return dev->cx231xx_gpio_i2c_write(dev,
+ msg->addr,
+ msg->buf,
+ msg->len);
+ }
+ }
+
+ /* special case for Xc5000 tuner case */
+ saddr_len = 1;
+
+ /* adjust the length to correct length */
+ size -= saddr_len;
+ buf_ptr = (u8 *) (msg->buf + 1);
+
+ do {
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg->addr;
+ req_data.direction = msg->flags;
+ req_data.saddr_len = saddr_len;
+ req_data.saddr_dat = msg->buf[0];
+ req_data.buf_size = size > 16 ? 16 : size;
+ req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);
+
+ bus->i2c_nostop = (size > 16) ? 1 : 0;
+ bus->i2c_reserve = (loop == 0) ? 0 : 1;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+ loop++;
+
+ if (size >= 16)
+ size -= 16;
+ else
+ size = 0;
+
+ } while (size > 0);
+
+ bus->i2c_nostop = 0;
+ bus->i2c_reserve = 0;
+
+ } else { /* regular case */
+
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg->addr;
+ req_data.direction = msg->flags;
+ req_data.saddr_len = 0;
+ req_data.saddr_dat = 0;
+ req_data.buf_size = msg->len;
+ req_data.p_buffer = msg->buf;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+ }
+
+ return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg)
+{
+ struct cx231xx_i2c *bus = i2c_adap->algo_data;
+ struct cx231xx *dev = bus->dev;
+ struct cx231xx_i2c_xfer_data req_data;
+ int status = 0;
+ u16 saddr = 0;
+ u8 need_gpio = 0;
+
+ if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+ if (msg->len == 2)
+ saddr = msg->buf[0] << 8 | msg->buf[1];
+ else if (msg->len == 1)
+ saddr = msg->buf[0];
+
+ if (dev->xc_fw_load_done) {
+
+ switch (saddr) {
+ case 0x0009: /* BUSY check */
+ dprintk1(1,
+ "GPIO R E A D: Special case BUSY check \n");
+ /*Try read BUSY register, just set it to zero*/
+ msg->buf[0] = 0;
+ if (msg->len == 2)
+ msg->buf[1] = 0;
+ return 0;
+ case 0x0004: /* read Lock status */
+ need_gpio = 1;
+ break;
+
+ }
+
+ if (need_gpio) {
+ /* this is a special case to handle Xceive tuner
+ clock stretch issue with gpio based I2C */
+
+ dprintk1(1,
+ "GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
+ msg->addr, msg->len,
+ msg->buf[0] << 8 | msg->buf[1]);
+
+ status =
+ dev->cx231xx_gpio_i2c_write(dev, msg->addr,
+ msg->buf,
+ msg->len);
+ status =
+ dev->cx231xx_gpio_i2c_read(dev, msg->addr,
+ msg->buf,
+ msg->len);
+ return status;
+ }
+ }
+
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg->addr;
+ req_data.direction = msg->flags;
+ req_data.saddr_len = msg->len;
+ req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
+ req_data.buf_size = msg->len;
+ req_data.p_buffer = msg->buf;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+ } else {
+
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg->addr;
+ req_data.direction = msg->flags;
+ req_data.saddr_len = 0;
+ req_data.saddr_dat = 0;
+ req_data.buf_size = msg->len;
+ req_data.p_buffer = msg->buf;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+ }
+
+ return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes_with_saddr()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg1,
+ const struct i2c_msg *msg2)
+{
+ struct cx231xx_i2c *bus = i2c_adap->algo_data;
+ struct cx231xx *dev = bus->dev;
+ struct cx231xx_i2c_xfer_data req_data;
+ int status = 0;
+ u16 saddr = 0;
+ u8 need_gpio = 0;
+
+ if (msg1->len == 2)
+ saddr = msg1->buf[0] << 8 | msg1->buf[1];
+ else if (msg1->len == 1)
+ saddr = msg1->buf[0];
+
+ if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
+ if ((msg2->len < 16)) {
+
+ dprintk1(1,
+ "i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
+ msg2->addr, msg2->len, saddr, msg1->len);
+
+ switch (saddr) {
+ case 0x0008: /* read FW load status */
+ need_gpio = 1;
+ break;
+ case 0x0004: /* read Lock status */
+ need_gpio = 1;
+ break;
+ }
+
+ if (need_gpio) {
+ status =
+ dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
+ msg1->buf,
+ msg1->len);
+ status =
+ dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
+ msg2->buf,
+ msg2->len);
+ return status;
+ }
+ }
+ }
+
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg2->addr;
+ req_data.direction = msg2->flags;
+ req_data.saddr_len = msg1->len;
+ req_data.saddr_dat = saddr;
+ req_data.buf_size = msg2->len;
+ req_data.p_buffer = msg2->buf;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+ return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg)
+{
+ struct cx231xx_i2c *bus = i2c_adap->algo_data;
+ struct cx231xx *dev = bus->dev;
+ struct cx231xx_i2c_xfer_data req_data;
+ int status = 0;
+
+ /* prepare xfer_data struct */
+ req_data.dev_addr = msg->addr;
+ req_data.direction = msg->flags;
+ req_data.saddr_len = 0;
+ req_data.saddr_dat = 0;
+ req_data.buf_size = 0;
+ req_data.p_buffer = NULL;
+
+ /* usb send command */
+ status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+ return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct cx231xx_i2c *bus = i2c_adap->algo_data;
+ struct cx231xx *dev = bus->dev;
+ int addr, rc, i, byte;
+
+ if (num <= 0)
+ return 0;
+ mutex_lock(&dev->i2c_lock);
+ for (i = 0; i < num; i++) {
+
+ addr = msgs[i].addr >> 1;
+
+ dprintk2(2, "%s %s addr=%x len=%d:",
+ (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+ i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+ if (!msgs[i].len) {
+ /* no len: check only for device presence */
+ rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
+ if (rc < 0) {
+ dprintk2(2, " no device\n");
+ mutex_unlock(&dev->i2c_lock);
+ return rc;
+ }
+
+ } else if (msgs[i].flags & I2C_M_RD) {
+ /* read bytes */
+ rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
+ if (i2c_debug >= 2) {
+ for (byte = 0; byte < msgs[i].len; byte++)
+ printk(" %02x", msgs[i].buf[byte]);
+ }
+ } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+ msgs[i].addr == msgs[i + 1].addr
+ && (msgs[i].len <= 2) && (bus->nr < 3)) {
+ /* read bytes */
+ rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
+ &msgs[i],
+ &msgs[i + 1]);
+ if (i2c_debug >= 2) {
+ for (byte = 0; byte < msgs[i].len; byte++)
+ printk(" %02x", msgs[i].buf[byte]);
+ }
+ i++;
+ } else {
+ /* write bytes */
+ if (i2c_debug >= 2) {
+ for (byte = 0; byte < msgs[i].len; byte++)
+ printk(" %02x", msgs[i].buf[byte]);
+ }
+ rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
+ }
+ if (rc < 0)
+ goto err;
+ if (i2c_debug >= 2)
+ printk("\n");
+ }
+ mutex_unlock(&dev->i2c_lock);
+ return num;
+err:
+ dprintk2(2, " ERROR: %i\n", rc);
+ mutex_unlock(&dev->i2c_lock);
+ return rc;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm cx231xx_algo = {
+ .master_xfer = cx231xx_i2c_xfer,
+ .functionality = functionality,
+};
+
+static struct i2c_adapter cx231xx_adap_template = {
+ .owner = THIS_MODULE,
+ .name = "cx231xx",
+ .algo = &cx231xx_algo,
+};
+
+static struct i2c_client cx231xx_client_template = {
+ .name = "cx231xx internal",
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static char *i2c_devs[128] = {
+ [0x60 >> 1] = "colibri",
+ [0x88 >> 1] = "hammerhead",
+ [0x8e >> 1] = "CIR",
+ [0x32 >> 1] = "GeminiIII",
+ [0x02 >> 1] = "Aquarius",
+ [0xa0 >> 1] = "eeprom",
+ [0xc0 >> 1] = "tuner",
+ [0xc2 >> 1] = "tuner",
+};
+
+/*
+ * cx231xx_do_i2c_scan()
+ * check i2c address range for devices
+ */
+void cx231xx_do_i2c_scan(struct cx231xx *dev, struct i2c_client *c)
+{
+ unsigned char buf;
+ int i, rc;
+
+ cx231xx_info(": Checking for I2C devices ..\n");
+ for (i = 0; i < 128; i++) {
+ c->addr = i;
+ rc = i2c_master_recv(c, &buf, 0);
+ if (rc < 0)
+ continue;
+ cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n",
+ dev->name, i << 1,
+ i2c_devs[i] ? i2c_devs[i] : "???");
+ }
+ cx231xx_info(": Completed Checking for I2C devices.\n");
+}
+
+/*
+ * cx231xx_i2c_register()
+ * register i2c bus
+ */
+int cx231xx_i2c_register(struct cx231xx_i2c *bus)
+{
+ struct cx231xx *dev = bus->dev;
+
+ BUG_ON(!dev->cx231xx_send_usb_command);
+
+ bus->i2c_adap = cx231xx_adap_template;
+ bus->i2c_client = cx231xx_client_template;
+ bus->i2c_adap.dev.parent = &dev->udev->dev;
+
+ strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
+
+ bus->i2c_adap.algo_data = bus;
+ i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
+ i2c_add_adapter(&bus->i2c_adap);
+
+ bus->i2c_client.adapter = &bus->i2c_adap;
+
+ if (0 == bus->i2c_rc) {
+ if (i2c_scan)
+ cx231xx_do_i2c_scan(dev, &bus->i2c_client);
+ } else
+ cx231xx_warn("%s: i2c bus %d register FAILED\n",
+ dev->name, bus->nr);
+
+ return bus->i2c_rc;
+}
+
+/*
+ * cx231xx_i2c_unregister()
+ * unregister i2c_bus
+ */
+int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
+{
+ i2c_del_adapter(&bus->i2c_adap);
+ return 0;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.