1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/video/matrox/i2c-matroxfb.c b/drivers/video/matrox/i2c-matroxfb.c
new file mode 100644
index 000000000000..57abbae5520f
--- /dev/null
+++ b/drivers/video/matrox/i2c-matroxfb.c
@@ -0,0 +1,223 @@
+/*
+ *
+ * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
+ *
+ * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
+ *
+ * Version: 1.64 2002/06/10
+ *
+ * See matroxfb_base.c for contributors.
+ *
+ */
+
+#include "matroxfb_base.h"
+#include "matroxfb_maven.h"
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+/* MGA-TVO I2C for G200, G400 */
+#define MAT_CLK         0x20
+#define MAT_DATA        0x10
+/* primary head DDC for Mystique(?), G100, G200, G400 */
+#define DDC1_CLK        0x08
+#define DDC1_DATA       0x02
+/* primary head DDC for Millennium, Millennium II */
+#define DDC1B_CLK       0x10
+#define DDC1B_DATA      0x04
+/* secondary head DDC for G400 */
+#define DDC2_CLK        0x04
+#define DDC2_DATA       0x01
+
+/******************************************************/
+
+struct matroxfb_dh_maven_info {
+        struct i2c_bit_adapter  maven;
+        struct i2c_bit_adapter  ddc1;
+        struct i2c_bit_adapter  ddc2;
+};
+
+static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
+        unsigned long flags;
+        int v;
+
+        matroxfb_DAC_lock_irqsave(flags);
+        v = matroxfb_DAC_in(PMINFO DAC_XGENIODATA);
+        matroxfb_DAC_unlock_irqrestore(flags);
+        return v;
+}
+
+static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
+        unsigned long flags;
+        int v;
+
+        matroxfb_DAC_lock_irqsave(flags);
+        v = (matroxfb_DAC_in(PMINFO DAC_XGENIOCTRL) & mask) | val;
+        matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, v);
+        /* We must reset GENIODATA very often... XFree plays with this register */
+        matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0x00);
+        matroxfb_DAC_unlock_irqrestore(flags);
+}
+
+/* software I2C functions */
+static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
+        if (state)
+                state = 0;
+        else
+                state = mask;
+        matroxfb_set_gpio(minfo, ~mask, state);
+}
+
+static void matroxfb_gpio_setsda(void* data, int state) {
+        struct i2c_bit_adapter* b = data;
+        matroxfb_i2c_set(b->minfo, b->mask.data, state);
+}
+
+static void matroxfb_gpio_setscl(void* data, int state) {
+        struct i2c_bit_adapter* b = data;
+        matroxfb_i2c_set(b->minfo, b->mask.clock, state);
+}
+
+static int matroxfb_gpio_getsda(void* data) {
+        struct i2c_bit_adapter* b = data;
+        return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
+}
+
+static int matroxfb_gpio_getscl(void* data) {
+        struct i2c_bit_adapter* b = data;
+        return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
+}
+
+static struct i2c_adapter matrox_i2c_adapter_template =
+{
+        .owner =        THIS_MODULE,
+        .id =           I2C_HW_B_G400,
+};
+
+static struct i2c_algo_bit_data matrox_i2c_algo_template =
+{
+        NULL,
+        matroxfb_gpio_setsda,
+        matroxfb_gpio_setscl,
+        matroxfb_gpio_getsda,
+        matroxfb_gpio_getscl,
+        10, 10, 100,
+};
+
+static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 
+                unsigned int data, unsigned int clock, const char* name) {
+        int err;
+
+        b->minfo = minfo;
+        b->mask.data = data;
+        b->mask.clock = clock;
+        b->adapter = matrox_i2c_adapter_template;
+        snprintf(b->adapter.name, I2C_NAME_SIZE, name,
+                minfo->fbcon.node);
+        i2c_set_adapdata(&b->adapter, b);
+        b->adapter.algo_data = &b->bac;
+        b->bac = matrox_i2c_algo_template;
+        b->bac.data = b;
+        err = i2c_bit_add_bus(&b->adapter);
+        b->initialized = !err;
+        return err;
+}
+
+static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
+        if (b->initialized) {
+                i2c_bit_del_bus(&b->adapter);
+                b->initialized = 0;
+        }
+}
+
+static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
+        i2c_bit_bus_del(&minfo2->maven);
+}
+
+static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
+        i2c_bit_bus_del(&minfo2->ddc1);
+}
+
+static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
+        i2c_bit_bus_del(&minfo2->ddc2);
+}
+
+static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
+        int err;
+        unsigned long flags;
+        struct matroxfb_dh_maven_info* m2info;
+
+        m2info = (struct matroxfb_dh_maven_info*)kmalloc(sizeof(*m2info), GFP_KERNEL);
+        if (!m2info)
+                return NULL;
+
+        matroxfb_DAC_lock_irqsave(flags);
+        matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0xFF);
+        matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, 0x00);
+        matroxfb_DAC_unlock_irqrestore(flags);
+
+        memset(m2info, 0, sizeof(*m2info));
+
+        switch (ACCESS_FBINFO(chip)) {
+                case MGA_2064:
+                case MGA_2164:
+                        err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1B_DATA, DDC1B_CLK, "DDC:fb%u #0");
+                        break;
+                default:
+                        err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1_DATA, DDC1_CLK, "DDC:fb%u #0");
+                        break;
+        }
+        if (err)
+                goto fail_ddc1;
+        if (ACCESS_FBINFO(devflags.dualhead)) {
+                err = i2c_bus_reg(&m2info->ddc2, minfo, DDC2_DATA, DDC2_CLK, "DDC:fb%u #1");
+                if (err == -ENODEV) {
+                        printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
+                } else if (err)
+                        printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
+                /* Register maven bus even on G450/G550 */
+                err = i2c_bus_reg(&m2info->maven, minfo, MAT_DATA, MAT_CLK, "MAVEN:fb%u");
+                if (err)
+                        printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
+        }
+        return m2info;
+fail_ddc1:;
+        kfree(m2info);
+        printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
+        return NULL;
+}
+
+static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
+        struct matroxfb_dh_maven_info* m2info = data;
+
+        i2c_maven_done(m2info);
+        i2c_ddc2_done(m2info);
+        i2c_ddc1_done(m2info);
+        kfree(m2info);
+}
+
+static struct matroxfb_driver i2c_matroxfb = {
+        .node =         LIST_HEAD_INIT(i2c_matroxfb.node),
+        .name =         "i2c-matroxfb",
+        .probe =        i2c_matroxfb_probe,
+        .remove =       i2c_matroxfb_remove,
+};
+
+static int __init i2c_matroxfb_init(void) {
+        if (matroxfb_register_driver(&i2c_matroxfb)) {
+                printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
+                return -ENXIO;
+        }
+        return 0;
+}
+
+static void __exit i2c_matroxfb_exit(void) {
+        matroxfb_unregister_driver(&i2c_matroxfb);
+}
+
+MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
+MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
+
+module_init(i2c_matroxfb_init);
+module_exit(i2c_matroxfb_exit);
+/* no __setup required */
+MODULE_LICENSE("GPL");