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path: root/drivers/video/fbdev/via/via_i2c.c
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Diffstat (limited to 'drivers/video/fbdev/via/via_i2c.c')
-rw-r--r--drivers/video/fbdev/via/via_i2c.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/drivers/video/fbdev/via/via_i2c.c b/drivers/video/fbdev/via/via_i2c.c
new file mode 100644
index 000000000..c7e63ab47
--- /dev/null
+++ b/drivers/video/fbdev/via/via_i2c.c
@@ -0,0 +1,281 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
+ * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
+
+ */
+
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/via-core.h>
+#include <linux/via_i2c.h>
+
+/*
+ * There can only be one set of these, so there's no point in having
+ * them be dynamically allocated...
+ */
+#define VIAFB_NUM_I2C 5
+static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
+static struct viafb_dev *i2c_vdev; /* Passed in from core */
+
+static void via_i2c_setscl(void *data, int state)
+{
+ u8 val;
+ struct via_port_cfg *adap_data = data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
+ if (state)
+ val |= 0x20;
+ else
+ val &= ~0x20;
+ switch (adap_data->type) {
+ case VIA_PORT_I2C:
+ val |= 0x01;
+ break;
+ case VIA_PORT_GPIO:
+ val |= 0x82;
+ break;
+ default:
+ printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
+ }
+ via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
+ spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
+}
+
+static int via_i2c_getscl(void *data)
+{
+ struct via_port_cfg *adap_data = data;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ if (adap_data->type == VIA_PORT_GPIO)
+ via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
+ 0, 0x80);
+ if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
+ ret = 1;
+ spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
+ return ret;
+}
+
+static int via_i2c_getsda(void *data)
+{
+ struct via_port_cfg *adap_data = data;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ if (adap_data->type == VIA_PORT_GPIO)
+ via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
+ 0, 0x40);
+ if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
+ ret = 1;
+ spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
+ return ret;
+}
+
+static void via_i2c_setsda(void *data, int state)
+{
+ u8 val;
+ struct via_port_cfg *adap_data = data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
+ if (state)
+ val |= 0x10;
+ else
+ val &= ~0x10;
+ switch (adap_data->type) {
+ case VIA_PORT_I2C:
+ val |= 0x01;
+ break;
+ case VIA_PORT_GPIO:
+ val |= 0x42;
+ break;
+ default:
+ printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
+ }
+ via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
+ spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
+}
+
+int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
+{
+ int ret;
+ u8 mm1[] = {0x00};
+ struct i2c_msg msgs[2];
+
+ if (!via_i2c_par[adap].is_active)
+ return -ENODEV;
+ *pdata = 0;
+ msgs[0].flags = 0;
+ msgs[1].flags = I2C_M_RD;
+ msgs[0].addr = msgs[1].addr = slave_addr / 2;
+ mm1[0] = index;
+ msgs[0].len = 1; msgs[1].len = 1;
+ msgs[0].buf = mm1; msgs[1].buf = pdata;
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
+}
+
+int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
+{
+ int ret;
+ u8 msg[2] = { index, data };
+ struct i2c_msg msgs;
+
+ if (!via_i2c_par[adap].is_active)
+ return -ENODEV;
+ msgs.flags = 0;
+ msgs.addr = slave_addr / 2;
+ msgs.len = 2;
+ msgs.buf = msg;
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
+ if (ret == 1)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
+}
+
+int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
+{
+ int ret;
+ u8 mm1[] = {0x00};
+ struct i2c_msg msgs[2];
+
+ if (!via_i2c_par[adap].is_active)
+ return -ENODEV;
+ msgs[0].flags = 0;
+ msgs[1].flags = I2C_M_RD;
+ msgs[0].addr = msgs[1].addr = slave_addr / 2;
+ mm1[0] = index;
+ msgs[0].len = 1; msgs[1].len = buff_len;
+ msgs[0].buf = mm1; msgs[1].buf = buff;
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
+}
+
+/*
+ * Allow other viafb subdevices to look up a specific adapter
+ * by port name.
+ */
+struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
+{
+ struct via_i2c_stuff *stuff = &via_i2c_par[which];
+
+ return &stuff->adapter;
+}
+EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
+
+
+static int create_i2c_bus(struct i2c_adapter *adapter,
+ struct i2c_algo_bit_data *algo,
+ struct via_port_cfg *adap_cfg,
+ struct pci_dev *pdev)
+{
+ algo->setsda = via_i2c_setsda;
+ algo->setscl = via_i2c_setscl;
+ algo->getsda = via_i2c_getsda;
+ algo->getscl = via_i2c_getscl;
+ algo->udelay = 10;
+ algo->timeout = 2;
+ algo->data = adap_cfg;
+
+ sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
+ adap_cfg->ioport_index);
+ adapter->owner = THIS_MODULE;
+ adapter->class = I2C_CLASS_DDC;
+ adapter->algo_data = algo;
+ if (pdev)
+ adapter->dev.parent = &pdev->dev;
+ else
+ adapter->dev.parent = NULL;
+ /* i2c_set_adapdata(adapter, adap_cfg); */
+
+ /* Raise SCL and SDA */
+ via_i2c_setsda(adap_cfg, 1);
+ via_i2c_setscl(adap_cfg, 1);
+ udelay(20);
+
+ return i2c_bit_add_bus(adapter);
+}
+
+static int viafb_i2c_probe(struct platform_device *platdev)
+{
+ int i, ret;
+ struct via_port_cfg *configs;
+
+ i2c_vdev = platdev->dev.platform_data;
+ configs = i2c_vdev->port_cfg;
+
+ for (i = 0; i < VIAFB_NUM_PORTS; i++) {
+ struct via_port_cfg *adap_cfg = configs++;
+ struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
+
+ i2c_stuff->is_active = 0;
+ if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
+ continue;
+ ret = create_i2c_bus(&i2c_stuff->adapter,
+ &i2c_stuff->algo, adap_cfg,
+ NULL); /* FIXME: PCIDEV */
+ if (ret < 0) {
+ printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
+ i, ret);
+ continue; /* Still try to make the rest */
+ }
+ i2c_stuff->is_active = 1;
+ }
+
+ return 0;
+}
+
+static int viafb_i2c_remove(struct platform_device *platdev)
+{
+ int i;
+
+ for (i = 0; i < VIAFB_NUM_PORTS; i++) {
+ struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
+ /*
+ * Only remove those entries in the array that we've
+ * actually used (and thus initialized algo_data)
+ */
+ if (i2c_stuff->is_active)
+ i2c_del_adapter(&i2c_stuff->adapter);
+ }
+ return 0;
+}
+
+static struct platform_driver via_i2c_driver = {
+ .driver = {
+ .name = "viafb-i2c",
+ },
+ .probe = viafb_i2c_probe,
+ .remove = viafb_i2c_remove,
+};
+
+int viafb_i2c_init(void)
+{
+ return platform_driver_register(&via_i2c_driver);
+}
+
+void viafb_i2c_exit(void)
+{
+ platform_driver_unregister(&via_i2c_driver);
+}