diff options
Diffstat (limited to 'drivers/media/video/vino.c')
-rw-r--r-- | drivers/media/video/vino.c | 247 |
1 files changed, 194 insertions, 53 deletions
diff --git a/drivers/media/video/vino.c b/drivers/media/video/vino.c index 96ce68a3dd9..b62e030ba83 100644 --- a/drivers/media/video/vino.c +++ b/drivers/media/video/vino.c @@ -33,7 +33,6 @@ #include <linux/kmod.h> #include <linux/i2c.h> -#include <linux/i2c-algo-sgi.h> #include <linux/videodev2.h> #include <media/v4l2-device.h> @@ -141,6 +140,20 @@ MODULE_LICENSE("GPL"); #define VINO_DATA_NORM_COUNT 4 +/* I2C controller flags */ +#define SGI_I2C_FORCE_IDLE (0 << 0) +#define SGI_I2C_NOT_IDLE (1 << 0) +#define SGI_I2C_WRITE (0 << 1) +#define SGI_I2C_READ (1 << 1) +#define SGI_I2C_RELEASE_BUS (0 << 2) +#define SGI_I2C_HOLD_BUS (1 << 2) +#define SGI_I2C_XFER_DONE (0 << 4) +#define SGI_I2C_XFER_BUSY (1 << 4) +#define SGI_I2C_ACK (0 << 5) +#define SGI_I2C_NACK (1 << 5) +#define SGI_I2C_BUS_OK (0 << 7) +#define SGI_I2C_BUS_ERR (1 << 7) + /* Internal data structure definitions */ struct vino_input { @@ -640,56 +653,6 @@ struct v4l2_queryctrl vino_saa7191_v4l2_controls[] = { } }; -/* VINO I2C bus functions */ - -unsigned i2c_vino_getctrl(void *data) -{ - return vino->i2c_control; -} - -void i2c_vino_setctrl(void *data, unsigned val) -{ - vino->i2c_control = val; -} - -unsigned i2c_vino_rdata(void *data) -{ - return vino->i2c_data; -} - -void i2c_vino_wdata(void *data, unsigned val) -{ - vino->i2c_data = val; -} - -static struct i2c_algo_sgi_data i2c_sgi_vino_data = -{ - .getctrl = &i2c_vino_getctrl, - .setctrl = &i2c_vino_setctrl, - .rdata = &i2c_vino_rdata, - .wdata = &i2c_vino_wdata, - .xfer_timeout = 200, - .ack_timeout = 1000, -}; - -static struct i2c_adapter vino_i2c_adapter = -{ - .name = "VINO I2C bus", - .id = I2C_HW_SGI_VINO, - .algo_data = &i2c_sgi_vino_data, - .owner = THIS_MODULE, -}; - -static int vino_i2c_add_bus(void) -{ - return i2c_sgi_add_bus(&vino_i2c_adapter); -} - -static int vino_i2c_del_bus(void) -{ - return i2c_del_adapter(&vino_i2c_adapter); -} - /* VINO framebuffer/DMA descriptor management */ static void vino_free_buffer_with_count(struct vino_framebuffer *fb, @@ -1635,6 +1598,184 @@ static inline void vino_set_default_framerate(struct vino_set_framerate(vcs, vino_data_norms[vcs->data_norm].fps_max); } +/* VINO I2C bus functions */ + +struct i2c_algo_sgi_data { + void *data; /* private data for lowlevel routines */ + unsigned (*getctrl)(void *data); + void (*setctrl)(void *data, unsigned val); + unsigned (*rdata)(void *data); + void (*wdata)(void *data, unsigned val); + + int xfer_timeout; + int ack_timeout; +}; + +static int wait_xfer_done(struct i2c_algo_sgi_data *adap) +{ + int i; + + for (i = 0; i < adap->xfer_timeout; i++) { + if ((adap->getctrl(adap->data) & SGI_I2C_XFER_BUSY) == 0) + return 0; + udelay(1); + } + + return -ETIMEDOUT; +} + +static int wait_ack(struct i2c_algo_sgi_data *adap) +{ + int i; + + if (wait_xfer_done(adap)) + return -ETIMEDOUT; + for (i = 0; i < adap->ack_timeout; i++) { + if ((adap->getctrl(adap->data) & SGI_I2C_NACK) == 0) + return 0; + udelay(1); + } + + return -ETIMEDOUT; +} + +static int force_idle(struct i2c_algo_sgi_data *adap) +{ + int i; + + adap->setctrl(adap->data, SGI_I2C_FORCE_IDLE); + for (i = 0; i < adap->xfer_timeout; i++) { + if ((adap->getctrl(adap->data) & SGI_I2C_NOT_IDLE) == 0) + goto out; + udelay(1); + } + return -ETIMEDOUT; +out: + if (adap->getctrl(adap->data) & SGI_I2C_BUS_ERR) + return -EIO; + return 0; +} + +static int do_address(struct i2c_algo_sgi_data *adap, unsigned int addr, + int rd) +{ + if (rd) + adap->setctrl(adap->data, SGI_I2C_NOT_IDLE); + /* Check if bus is idle, eventually force it to do so */ + if (adap->getctrl(adap->data) & SGI_I2C_NOT_IDLE) + if (force_idle(adap)) + return -EIO; + /* Write out the i2c chip address and specify operation */ + adap->setctrl(adap->data, + SGI_I2C_HOLD_BUS | SGI_I2C_WRITE | SGI_I2C_NOT_IDLE); + if (rd) + addr |= 1; + adap->wdata(adap->data, addr); + if (wait_ack(adap)) + return -EIO; + return 0; +} + +static int i2c_read(struct i2c_algo_sgi_data *adap, unsigned char *buf, + unsigned int len) +{ + int i; + + adap->setctrl(adap->data, + SGI_I2C_HOLD_BUS | SGI_I2C_READ | SGI_I2C_NOT_IDLE); + for (i = 0; i < len; i++) { + if (wait_xfer_done(adap)) + return -EIO; + buf[i] = adap->rdata(adap->data); + } + adap->setctrl(adap->data, SGI_I2C_RELEASE_BUS | SGI_I2C_FORCE_IDLE); + + return 0; + +} + +static int i2c_write(struct i2c_algo_sgi_data *adap, unsigned char *buf, + unsigned int len) +{ + int i; + + /* We are already in write state */ + for (i = 0; i < len; i++) { + adap->wdata(adap->data, buf[i]); + if (wait_ack(adap)) + return -EIO; + } + return 0; +} + +static int sgi_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, + int num) +{ + struct i2c_algo_sgi_data *adap = i2c_adap->algo_data; + struct i2c_msg *p; + int i, err = 0; + + for (i = 0; !err && i < num; i++) { + p = &msgs[i]; + err = do_address(adap, p->addr, p->flags & I2C_M_RD); + if (err || !p->len) + continue; + if (p->flags & I2C_M_RD) + err = i2c_read(adap, p->buf, p->len); + else + err = i2c_write(adap, p->buf, p->len); + } + + return (err < 0) ? err : i; +} + +static u32 sgi_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm sgi_algo = { + .master_xfer = sgi_xfer, + .functionality = sgi_func, +}; + +static unsigned i2c_vino_getctrl(void *data) +{ + return vino->i2c_control; +} + +static void i2c_vino_setctrl(void *data, unsigned val) +{ + vino->i2c_control = val; +} + +static unsigned i2c_vino_rdata(void *data) +{ + return vino->i2c_data; +} + +static void i2c_vino_wdata(void *data, unsigned val) +{ + vino->i2c_data = val; +} + +static struct i2c_algo_sgi_data i2c_sgi_vino_data = { + .getctrl = &i2c_vino_getctrl, + .setctrl = &i2c_vino_setctrl, + .rdata = &i2c_vino_rdata, + .wdata = &i2c_vino_wdata, + .xfer_timeout = 200, + .ack_timeout = 1000, +}; + +static struct i2c_adapter vino_i2c_adapter = { + .name = "VINO I2C bus", + .id = I2C_HW_SGI_VINO, + .algo = &sgi_algo, + .algo_data = &i2c_sgi_vino_data, + .owner = THIS_MODULE, +}; + /* * Prepare VINO for DMA transfer... * (execute only with vino_lock and input_lock locked) @@ -3999,7 +4140,7 @@ static void vino_module_cleanup(int stage) video_unregister_device(vino_drvdata->a.vdev); vino_drvdata->a.vdev = NULL; case 9: - vino_i2c_del_bus(); + i2c_del_adapter(&vino_i2c_adapter); case 8: free_irq(SGI_VINO_IRQ, NULL); case 7: @@ -4222,7 +4363,7 @@ static int __init vino_module_init(void) } vino_init_stage++; - ret = vino_i2c_add_bus(); + ret = i2c_add_adapter(&vino_i2c_adapter); if (ret) { printk(KERN_ERR "VINO I2C bus registration failed\n"); vino_module_cleanup(vino_init_stage); |