diff options
Diffstat (limited to 'drivers/media/video/via-camera.c')
| -rw-r--r-- | drivers/media/video/via-camera.c | 147 |
1 files changed, 101 insertions, 46 deletions
diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c index 2f973cd5640..8c780c2d937 100644 --- a/drivers/media/video/via-camera.c +++ b/drivers/media/video/via-camera.c @@ -25,6 +25,7 @@ #include <linux/via-core.h> #include <linux/via-gpio.h> #include <linux/via_i2c.h> +#include <asm/olpc.h> #include "via-camera.h" @@ -38,14 +39,12 @@ MODULE_PARM_DESC(flip_image, "If set, the sensor will be instructed to flip the image " "vertically."); -#ifdef CONFIG_OLPC_XO_1_5 static int override_serial; module_param(override_serial, bool, 0444); MODULE_PARM_DESC(override_serial, "The camera driver will normally refuse to load if " "the XO 1.5 serial port is enabled. Set this option " - "to force the issue."); -#endif + "to force-enable the camera."); /* * Basic window sizes. @@ -1246,6 +1245,62 @@ static const struct v4l2_ioctl_ops viacam_ioctl_ops = { /* * Power management. */ +#ifdef CONFIG_PM + +static int viacam_suspend(void *priv) +{ + struct via_camera *cam = priv; + enum viacam_opstate state = cam->opstate; + + if (cam->opstate != S_IDLE) { + viacam_stop_engine(cam); + cam->opstate = state; /* So resume restarts */ + } + + return 0; +} + +static int viacam_resume(void *priv) +{ + struct via_camera *cam = priv; + int ret = 0; + + /* + * Get back to a reasonable operating state. + */ + via_write_reg_mask(VIASR, 0x78, 0, 0x80); + via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); + viacam_int_disable(cam); + set_bit(CF_CONFIG_NEEDED, &cam->flags); + /* + * Make sure the sensor's power state is correct + */ + if (cam->users > 0) + via_sensor_power_up(cam); + else + via_sensor_power_down(cam); + /* + * If it was operating, try to restart it. + */ + if (cam->opstate != S_IDLE) { + mutex_lock(&cam->lock); + ret = viacam_configure_sensor(cam); + if (!ret) + ret = viacam_config_controller(cam); + mutex_unlock(&cam->lock); + if (!ret) + viacam_start_engine(cam); + } + + return ret; +} + +static struct viafb_pm_hooks viacam_pm_hooks = { + .suspend = viacam_suspend, + .resume = viacam_resume +}; + +#endif /* CONFIG_PM */ /* * Setup stuff. @@ -1261,6 +1316,37 @@ static struct video_device viacam_v4l_template = { .release = video_device_release_empty, /* Check this */ }; +/* + * The OLPC folks put the serial port on the same pin as + * the camera. They also get grumpy if we break the + * serial port and keep them from using it. So we have + * to check the serial enable bit and not step on it. + */ +#define VIACAM_SERIAL_DEVFN 0x88 +#define VIACAM_SERIAL_CREG 0x46 +#define VIACAM_SERIAL_BIT 0x40 + +static __devinit bool viacam_serial_is_enabled(void) +{ + struct pci_bus *pbus = pci_find_bus(0, 0); + u8 cbyte; + + pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, + VIACAM_SERIAL_CREG, &cbyte); + if ((cbyte & VIACAM_SERIAL_BIT) == 0) + return false; /* Not enabled */ + if (override_serial == 0) { + printk(KERN_NOTICE "Via camera: serial port is enabled, " \ + "refusing to load.\n"); + printk(KERN_NOTICE "Specify override_serial=1 to force " \ + "module loading.\n"); + return true; + } + printk(KERN_NOTICE "Via camera: overriding serial port\n"); + pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, + VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); + return false; +} static __devinit int viacam_probe(struct platform_device *pdev) { @@ -1292,6 +1378,10 @@ static __devinit int viacam_probe(struct platform_device *pdev) printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); return -ENOMEM; } + + if (machine_is_olpc() && viacam_serial_is_enabled()) + return -EBUSY; + /* * Basic structure initialization. */ @@ -1369,6 +1459,14 @@ static __devinit int viacam_probe(struct platform_device *pdev) goto out_irq; video_set_drvdata(&cam->vdev, cam); +#ifdef CONFIG_PM + /* + * Hook into PM events + */ + viacam_pm_hooks.private = cam; + viafb_pm_register(&viacam_pm_hooks); +#endif + /* Power the sensor down until somebody opens the device */ via_sensor_power_down(cam); return 0; @@ -1395,7 +1493,6 @@ static __devexit int viacam_remove(struct platform_device *pdev) return 0; } - static struct platform_driver viacam_driver = { .driver = { .name = "viafb-camera", @@ -1404,50 +1501,8 @@ static struct platform_driver viacam_driver = { .remove = viacam_remove, }; - -#ifdef CONFIG_OLPC_XO_1_5 -/* - * The OLPC folks put the serial port on the same pin as - * the camera. They also get grumpy if we break the - * serial port and keep them from using it. So we have - * to check the serial enable bit and not step on it. - */ -#define VIACAM_SERIAL_DEVFN 0x88 -#define VIACAM_SERIAL_CREG 0x46 -#define VIACAM_SERIAL_BIT 0x40 - -static __devinit int viacam_check_serial_port(void) -{ - struct pci_bus *pbus = pci_find_bus(0, 0); - u8 cbyte; - - pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, - VIACAM_SERIAL_CREG, &cbyte); - if ((cbyte & VIACAM_SERIAL_BIT) == 0) - return 0; /* Not enabled */ - if (override_serial == 0) { - printk(KERN_NOTICE "Via camera: serial port is enabled, " \ - "refusing to load.\n"); - printk(KERN_NOTICE "Specify override_serial=1 to force " \ - "module loading.\n"); - return -EBUSY; - } - printk(KERN_NOTICE "Via camera: overriding serial port\n"); - pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, - VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); - return 0; -} -#endif - - - - static int viacam_init(void) { -#ifdef CONFIG_OLPC_XO_1_5 - if (viacam_check_serial_port()) - return -EBUSY; -#endif return platform_driver_register(&viacam_driver); } module_init(viacam_init); |