diff options
Diffstat (limited to 'drivers/video/matrox/i2c-matroxfb.c')
| -rw-r--r-- | drivers/video/matrox/i2c-matroxfb.c | 223 |
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"); |