static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	static const struct ov_i2c_regvals contrast_7660[][31] = {
		{{0x6c, 0xf0}, {0x6d, 0xf0}, {0x6e, 0xf8}, {0x6f, 0xa0},
		 {0x70, 0x58}, {0x71, 0x38}, {0x72, 0x30}, {0x73, 0x30},
		 {0x74, 0x28}, {0x75, 0x28}, {0x76, 0x24}, {0x77, 0x24},
		 {0x78, 0x22}, {0x79, 0x28}, {0x7a, 0x2a}, {0x7b, 0x34},
		 {0x7c, 0x0f}, {0x7d, 0x1e}, {0x7e, 0x3d}, {0x7f, 0x65},
		 {0x80, 0x70}, {0x81, 0x77}, {0x82, 0x7d}, {0x83, 0x83},
		 {0x84, 0x88}, {0x85, 0x8d}, {0x86, 0x96}, {0x87, 0x9f},
		 {0x88, 0xb0}, {0x89, 0xc4}, {0x8a, 0xd9}},
		{{0x6c, 0xf0}, {0x6d, 0xf0}, {0x6e, 0xf8}, {0x6f, 0x94},
		 {0x70, 0x58}, {0x71, 0x40}, {0x72, 0x30}, {0x73, 0x30},
		 {0x74, 0x30}, {0x75, 0x30}, {0x76, 0x2c}, {0x77, 0x24},
		 {0x78, 0x22}, {0x79, 0x28}, {0x7a, 0x2a}, {0x7b, 0x31},
		 {0x7c, 0x0f}, {0x7d, 0x1e}, {0x7e, 0x3d}, {0x7f, 0x62},
		 {0x80, 0x6d}, {0x81, 0x75}, {0x82, 0x7b}, {0x83, 0x81},
		 {0x84, 0x87}, {0x85, 0x8d}, {0x86, 0x98}, {0x87, 0xa1},
		 {0x88, 0xb2}, {0x89, 0xc6}, {0x8a, 0xdb}},
		{{0x6c, 0xf0}, {0x6d, 0xf0}, {0x6e, 0xf0}, {0x6f, 0x84},
		 {0x70, 0x58}, {0x71, 0x48}, {0x72, 0x40}, {0x73, 0x40},
		 {0x74, 0x28}, {0x75, 0x28}, {0x76, 0x28}, {0x77, 0x24},
		 {0x78, 0x26}, {0x79, 0x28}, {0x7a, 0x28}, {0x7b, 0x34},
		 {0x7c, 0x0f}, {0x7d, 0x1e}, {0x7e, 0x3c}, {0x7f, 0x5d},
		 {0x80, 0x68}, {0x81, 0x71}, {0x82, 0x79}, {0x83, 0x81},
		 {0x84, 0x86}, {0x85, 0x8b}, {0x86, 0x95}, {0x87, 0x9e},
		 {0x88, 0xb1}, {0x89, 0xc5}, {0x8a, 0xd9}},
		{{0x6c, 0xf0}, {0x6d, 0xf0}, {0x6e, 0xf0}, {0x6f, 0x70},
		 {0x70, 0x58}, {0x71, 0x58}, {0x72, 0x48}, {0x73, 0x48},
		 {0x74, 0x38}, {0x75, 0x40}, {0x76, 0x34}, {0x77, 0x34},
		 {0x78, 0x2e}, {0x79, 0x28}, {0x7a, 0x24}, {0x7b, 0x22},
		 {0x7c, 0x0f}, {0x7d, 0x1e}, {0x7e, 0x3c}, {0x7f, 0x58},
		 {0x80, 0x63}, {0x81, 0x6e}, {0x82, 0x77}, {0x83, 0x80},
		 {0x84, 0x87}, {0x85, 0x8f}, {0x86, 0x9c}, {0x87, 0xa9},
		 {0x88, 0xc0}, {0x89, 0xd4}, {0x8a, 0xe6}},
		{{0x6c, 0xa0}, {0x6d, 0xf0}, {0x6e, 0x90}, {0x6f, 0x80},
		 {0x70, 0x70}, {0x71, 0x80}, {0x72, 0x60}, {0x73, 0x60},
		 {0x74, 0x58}, {0x75, 0x60}, {0x76, 0x4c}, {0x77, 0x38},
		 {0x78, 0x38}, {0x79, 0x2a}, {0x7a, 0x20}, {0x7b, 0x0e},
		 {0x7c, 0x0a}, {0x7d, 0x14}, {0x7e, 0x26}, {0x7f, 0x46},
		 {0x80, 0x54}, {0x81, 0x64}, {0x82, 0x70}, {0x83, 0x7c},
		 {0x84, 0x87}, {0x85, 0x93}, {0x86, 0xa6}, {0x87, 0xb4},
		 {0x88, 0xd0}, {0x89, 0xe5}, {0x8a, 0xf5}},
		{{0x6c, 0x60}, {0x6d, 0x80}, {0x6e, 0x60}, {0x6f, 0x80},
		 {0x70, 0x80}, {0x71, 0x80}, {0x72, 0x88}, {0x73, 0x30},
		 {0x74, 0x70}, {0x75, 0x68}, {0x76, 0x64}, {0x77, 0x50},
		 {0x78, 0x3c}, {0x79, 0x22}, {0x7a, 0x10}, {0x7b, 0x08},
		 {0x7c, 0x06}, {0x7d, 0x0e}, {0x7e, 0x1a}, {0x7f, 0x3a},
		 {0x80, 0x4a}, {0x81, 0x5a}, {0x82, 0x6b}, {0x83, 0x7b},
		 {0x84, 0x89}, {0x85, 0x96}, {0x86, 0xaf}, {0x87, 0xc3},
		 {0x88, 0xe1}, {0x89, 0xf2}, {0x8a, 0xfa}},
		{{0x6c, 0x20}, {0x6d, 0x40}, {0x6e, 0x20}, {0x6f, 0x60},
		 {0x70, 0x88}, {0x71, 0xc8}, {0x72, 0xc0}, {0x73, 0xb8},
		 {0x74, 0xa8}, {0x75, 0xb8}, {0x76, 0x80}, {0x77, 0x5c},
		 {0x78, 0x26}, {0x79, 0x10}, {0x7a, 0x08}, {0x7b, 0x04},
		 {0x7c, 0x02}, {0x7d, 0x06}, {0x7e, 0x0a}, {0x7f, 0x22},
		 {0x80, 0x33}, {0x81, 0x4c}, {0x82, 0x64}, {0x83, 0x7b},
		 {0x84, 0x90}, {0x85, 0xa7}, {0x86, 0xc7}, {0x87, 0xde},
		 {0x88, 0xf1}, {0x89, 0xf9}, {0x8a, 0xfd}},
	};

	switch (sd->sensor) {
	case SEN_OV7610:
	case SEN_OV6620:
		i2c_w(sd, OV7610_REG_CNT, val);
		break;
	case SEN_OV6630:
	case SEN_OV66308AF:
		i2c_w_mask(sd, OV7610_REG_CNT, val >> 4, 0x0f);
		break;
	case SEN_OV8610: {
		static const u8 ctab[] = {
			0x03, 0x09, 0x0b, 0x0f, 0x53, 0x6f, 0x35, 0x7f
		};

		/* Use Y gamma control instead. Bit 0 enables it. */
		i2c_w(sd, 0x64, ctab[val >> 5]);
		break;
	    }
	case SEN_OV7620:
	case SEN_OV7620AE: {
		static const u8 ctab[] = {
			0x01, 0x05, 0x09, 0x11, 0x15, 0x35, 0x37, 0x57,
			0x5b, 0xa5, 0xa7, 0xc7, 0xc9, 0xcf, 0xef, 0xff
		};

		/* Use Y gamma control instead. Bit 0 enables it. */
		i2c_w(sd, 0x64, ctab[val >> 4]);
		break;
	    }
	case SEN_OV7660:
		write_i2c_regvals(sd, contrast_7660[val],
					ARRAY_SIZE(contrast_7660[0]));
		break;
	case SEN_OV7670:
		/* check that this isn't just the same as ov7610 */
		i2c_w(sd, OV7670_R56_CONTRAS, val >> 1);
		break;
	}
}