Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 390 insertions, 0 deletions

diff --git a/drivers/media/pci/bt8xx/bttv-i2c.c b/drivers/media/pci/bt8xx/bttv-i2c.c
new file mode 100644
index 0000000000..4a8a3f80c6
--- /dev/null
+++ b/drivers/media/pci/bt8xx/bttv-i2c.c
@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+
+    bttv-i2c.c  --  all the i2c code is here
+
+    bttv - Bt848 frame grabber driver
+
+    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
+			   & Marcus Metzler (mocm@thp.uni-koeln.de)
+    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
+
+    (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org>
+	- Multituner support and i2c address binding
+
+
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include "bttvp.h"
+#include <media/v4l2-common.h>
+#include <linux/jiffies.h>
+#include <asm/io.h>
+
+static int i2c_debug;
+static int i2c_hw;
+static int i2c_scan;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
+module_param(i2c_hw,    int, 0444);
+MODULE_PARM_DESC(i2c_hw, "force use of hardware i2c support, instead of software bitbang");
+module_param(i2c_scan,  int, 0444);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+static unsigned int i2c_udelay = 5;
+module_param(i2c_udelay, int, 0444);
+MODULE_PARM_DESC(i2c_udelay, "soft i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - bitbanging adapter (software i2c)                       */
+
+static void bttv_bit_setscl(void *data, int state)
+{
+	struct bttv *btv = (struct bttv*)data;
+
+	if (state)
+		btv->i2c_state |= 0x02;
+	else
+		btv->i2c_state &= ~0x02;
+	btwrite(btv->i2c_state, BT848_I2C);
+	btread(BT848_I2C);
+}
+
+static void bttv_bit_setsda(void *data, int state)
+{
+	struct bttv *btv = (struct bttv*)data;
+
+	if (state)
+		btv->i2c_state |= 0x01;
+	else
+		btv->i2c_state &= ~0x01;
+	btwrite(btv->i2c_state, BT848_I2C);
+	btread(BT848_I2C);
+}
+
+static int bttv_bit_getscl(void *data)
+{
+	struct bttv *btv = (struct bttv*)data;
+	int state;
+
+	state = btread(BT848_I2C) & 0x02 ? 1 : 0;
+	return state;
+}
+
+static int bttv_bit_getsda(void *data)
+{
+	struct bttv *btv = (struct bttv*)data;
+	int state;
+
+	state = btread(BT848_I2C) & 0x01;
+	return state;
+}
+
+static const struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
+	.setsda  = bttv_bit_setsda,
+	.setscl  = bttv_bit_setscl,
+	.getsda  = bttv_bit_getsda,
+	.getscl  = bttv_bit_getscl,
+	.udelay  = 16,
+	.timeout = 200,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - hardware i2c                                            */
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL;
+}
+
+static int
+bttv_i2c_wait_done(struct bttv *btv)
+{
+	int rc = 0;
+
+	/* timeout */
+	if (wait_event_interruptible_timeout(btv->i2c_queue,
+	    btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
+		rc = -EIO;
+
+	if (btv->i2c_done & BT848_INT_RACK)
+		rc = 1;
+	btv->i2c_done = 0;
+	return rc;
+}
+
+#define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
+		BT848_I2C_SCL | BT848_I2C_SDA)
+
+static int
+bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
+{
+	u32 xmit;
+	int retval,cnt;
+
+	/* sanity checks */
+	if (0 == msg->len)
+		return -EINVAL;
+
+	/* start, address + first byte */
+	xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
+	if (msg->len > 1 || !last)
+		xmit |= BT878_I2C_NOSTOP;
+	btwrite(xmit, BT848_I2C);
+	retval = bttv_i2c_wait_done(btv);
+	if (retval < 0)
+		goto err;
+	if (retval == 0)
+		goto eio;
+	if (i2c_debug) {
+		pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
+	}
+
+	for (cnt = 1; cnt < msg->len; cnt++ ) {
+		/* following bytes */
+		xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
+		if (cnt < msg->len-1 || !last)
+			xmit |= BT878_I2C_NOSTOP;
+		btwrite(xmit, BT848_I2C);
+		retval = bttv_i2c_wait_done(btv);
+		if (retval < 0)
+			goto err;
+		if (retval == 0)
+			goto eio;
+		if (i2c_debug)
+			pr_cont(" %02x", msg->buf[cnt]);
+	}
+	if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
+		pr_cont(">\n");
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	if (i2c_debug)
+		pr_cont(" ERR: %d\n",retval);
+	return retval;
+}
+
+static int
+bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
+{
+	u32 xmit;
+	u32 cnt;
+	int retval;
+
+	for (cnt = 0; cnt < msg->len; cnt++) {
+		xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
+		if (cnt < msg->len-1)
+			xmit |= BT848_I2C_W3B;
+		if (cnt < msg->len-1 || !last)
+			xmit |= BT878_I2C_NOSTOP;
+		if (cnt)
+			xmit |= BT878_I2C_NOSTART;
+
+		if (i2c_debug) {
+			if (!(xmit & BT878_I2C_NOSTART))
+				pr_cont(" <R %02x", (msg->addr << 1) +1);
+		}
+
+		btwrite(xmit, BT848_I2C);
+		retval = bttv_i2c_wait_done(btv);
+		if (retval < 0)
+			goto err;
+		if (retval == 0)
+			goto eio;
+		msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
+		if (i2c_debug) {
+			pr_cont(" =%02x", msg->buf[cnt]);
+		}
+		if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
+			pr_cont(" >\n");
+	}
+
+
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	if (i2c_debug)
+		pr_cont(" ERR: %d\n",retval);
+	return retval;
+}
+
+static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
+{
+	struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
+	struct bttv *btv = to_bttv(v4l2_dev);
+	int retval = 0;
+	int i;
+
+	if (i2c_debug)
+		pr_debug("bt-i2c:");
+
+	btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
+	for (i = 0 ; i < num; i++) {
+		if (msgs[i].flags & I2C_M_RD) {
+			/* read */
+			retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
+			if (retval < 0)
+				goto err;
+		} else {
+			/* write */
+			retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
+			if (retval < 0)
+				goto err;
+		}
+	}
+	return num;
+
+ err:
+	return retval;
+}
+
+static const struct i2c_algorithm bttv_algo = {
+	.master_xfer   = bttv_i2c_xfer,
+	.functionality = functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - common stuff                                            */
+
+/* read I2C */
+int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
+{
+	unsigned char buffer = 0;
+
+	if (0 != btv->i2c_rc)
+		return -1;
+	if (bttv_verbose && NULL != probe_for)
+		pr_info("%d: i2c: checking for %s @ 0x%02x... ",
+			btv->c.nr, probe_for, addr);
+	btv->i2c_client.addr = addr >> 1;
+	if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
+		if (NULL != probe_for) {
+			if (bttv_verbose)
+				pr_cont("not found\n");
+		} else
+			pr_warn("%d: i2c read 0x%x: error\n",
+				btv->c.nr, addr);
+		return -1;
+	}
+	if (bttv_verbose && NULL != probe_for)
+		pr_cont("found\n");
+	return buffer;
+}
+
+/* write I2C */
+int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
+		    unsigned char b2, int both)
+{
+	unsigned char buffer[2];
+	int bytes = both ? 2 : 1;
+
+	if (0 != btv->i2c_rc)
+		return -1;
+	btv->i2c_client.addr = addr >> 1;
+	buffer[0] = b1;
+	buffer[1] = b2;
+	if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
+		return -1;
+	return 0;
+}
+
+/* read EEPROM content */
+void bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
+{
+	memset(eedata, 0, 256);
+	if (0 != btv->i2c_rc)
+		return;
+	btv->i2c_client.addr = addr >> 1;
+	tveeprom_read(&btv->i2c_client, eedata, 256);
+}
+
+static char *i2c_devs[128] = {
+	[ 0x1c >> 1 ] = "lgdt330x",
+	[ 0x30 >> 1 ] = "IR (hauppauge)",
+	[ 0x80 >> 1 ] = "msp34xx",
+	[ 0x86 >> 1 ] = "tda9887",
+	[ 0xa0 >> 1 ] = "eeprom",
+	[ 0xc0 >> 1 ] = "tuner (analog)",
+	[ 0xc2 >> 1 ] = "tuner (analog)",
+};
+
+static void do_i2c_scan(char *name, struct i2c_client *c)
+{
+	unsigned char buf;
+	int i,rc;
+
+	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
+		c->addr = i;
+		rc = i2c_master_recv(c,&buf,0);
+		if (rc < 0)
+			continue;
+		pr_info("%s: i2c scan: found device @ 0x%x  [%s]\n",
+			name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+	}
+}
+
+/* init + register i2c adapter */
+int init_bttv_i2c(struct bttv *btv)
+{
+	strscpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
+
+	if (i2c_hw)
+		btv->use_i2c_hw = 1;
+	if (btv->use_i2c_hw) {
+		/* bt878 */
+		strscpy(btv->c.i2c_adap.name, "bt878",
+			sizeof(btv->c.i2c_adap.name));
+		btv->c.i2c_adap.algo = &bttv_algo;
+	} else {
+		/* bt848 */
+	/* Prevents usage of invalid delay values */
+		if (i2c_udelay<5)
+			i2c_udelay=5;
+
+		strscpy(btv->c.i2c_adap.name, "bttv",
+			sizeof(btv->c.i2c_adap.name));
+		btv->i2c_algo = bttv_i2c_algo_bit_template;
+		btv->i2c_algo.udelay = i2c_udelay;
+		btv->i2c_algo.data = btv;
+		btv->c.i2c_adap.algo_data = &btv->i2c_algo;
+	}
+	btv->c.i2c_adap.owner = THIS_MODULE;
+
+	btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
+	snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
+		 "bt%d #%d [%s]", btv->id, btv->c.nr,
+		 btv->use_i2c_hw ? "hw" : "sw");
+
+	i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
+	btv->i2c_client.adapter = &btv->c.i2c_adap;
+
+
+	if (btv->use_i2c_hw) {
+		btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
+	} else {
+		bttv_bit_setscl(btv,1);
+		bttv_bit_setsda(btv,1);
+		btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
+	}
+	if (0 == btv->i2c_rc && i2c_scan)
+		do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
+
+	return btv->i2c_rc;
+}
+
+int fini_bttv_i2c(struct bttv *btv)
+{
+	if (btv->i2c_rc == 0)
+		i2c_del_adapter(&btv->c.i2c_adap);
+
+	return 0;
+}