X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmedia%2Fv4l2-core%2Fv4l2-common.c;fp=kernel%2Fdrivers%2Fmedia%2Fv4l2-core%2Fv4l2-common.c;h=5b808500e7e79166c4c2868a8c37d737209eb263;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/media/v4l2-core/v4l2-common.c b/kernel/drivers/media/v4l2-core/v4l2-common.c new file mode 100644 index 000000000..5b808500e --- /dev/null +++ b/kernel/drivers/media/v4l2-core/v4l2-common.c @@ -0,0 +1,407 @@ +/* + * Video for Linux Two + * + * A generic video device interface for the LINUX operating system + * using a set of device structures/vectors for low level operations. + * + * This file replaces the videodev.c file that comes with the + * regular kernel distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Author: Bill Dirks + * based on code by Alan Cox, + * + */ + +/* + * Video capture interface for Linux + * + * A generic video device interface for the LINUX operating system + * using a set of device structures/vectors for low level operations. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Author: Alan Cox, + * + * Fixes: + */ + +/* + * Video4linux 1/2 integration by Justin Schoeman + * + * 2.4 PROCFS support ported from 2.4 kernels by + * Iñaki García Etxebarria + * Makefile fix by "W. Michael Petullo" + * 2.4 devfs support ported from 2.4 kernels by + * Dan Merillat + * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman) + */ + +#include +#include +#include +#include +#include +#include +#include +#if defined(CONFIG_SPI) +#include +#endif +#include +#include +#include +#include +#include +#include +#include + +#include + +MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr"); +MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers"); +MODULE_LICENSE("GPL"); + +/* + * + * V 4 L 2 D R I V E R H E L P E R A P I + * + */ + +/* + * Video Standard Operations (contributed by Michael Schimek) + */ + +/* Helper functions for control handling */ + +/* Fill in a struct v4l2_queryctrl */ +int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 _min, s32 _max, s32 _step, s32 _def) +{ + const char *name; + s64 min = _min; + s64 max = _max; + u64 step = _step; + s64 def = _def; + + v4l2_ctrl_fill(qctrl->id, &name, &qctrl->type, + &min, &max, &step, &def, &qctrl->flags); + + if (name == NULL) + return -EINVAL; + + qctrl->minimum = min; + qctrl->maximum = max; + qctrl->step = step; + qctrl->default_value = def; + qctrl->reserved[0] = qctrl->reserved[1] = 0; + strlcpy(qctrl->name, name, sizeof(qctrl->name)); + return 0; +} +EXPORT_SYMBOL(v4l2_ctrl_query_fill); + +/* I2C Helper functions */ + +#if IS_ENABLED(CONFIG_I2C) + +void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, + const struct v4l2_subdev_ops *ops) +{ + v4l2_subdev_init(sd, ops); + sd->flags |= V4L2_SUBDEV_FL_IS_I2C; + /* the owner is the same as the i2c_client's driver owner */ + sd->owner = client->dev.driver->owner; + sd->dev = &client->dev; + /* i2c_client and v4l2_subdev point to one another */ + v4l2_set_subdevdata(sd, client); + i2c_set_clientdata(client, sd); + /* initialize name */ + snprintf(sd->name, sizeof(sd->name), "%s %d-%04x", + client->dev.driver->name, i2c_adapter_id(client->adapter), + client->addr); +} +EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init); + +/* Load an i2c sub-device. */ +struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, + struct i2c_adapter *adapter, struct i2c_board_info *info, + const unsigned short *probe_addrs) +{ + struct v4l2_subdev *sd = NULL; + struct i2c_client *client; + + BUG_ON(!v4l2_dev); + + request_module(I2C_MODULE_PREFIX "%s", info->type); + + /* Create the i2c client */ + if (info->addr == 0 && probe_addrs) + client = i2c_new_probed_device(adapter, info, probe_addrs, + NULL); + else + client = i2c_new_device(adapter, info); + + /* Note: by loading the module first we are certain that c->driver + will be set if the driver was found. If the module was not loaded + first, then the i2c core tries to delay-load the module for us, + and then c->driver is still NULL until the module is finally + loaded. This delay-load mechanism doesn't work if other drivers + want to use the i2c device, so explicitly loading the module + is the best alternative. */ + if (client == NULL || client->dev.driver == NULL) + goto error; + + /* Lock the module so we can safely get the v4l2_subdev pointer */ + if (!try_module_get(client->dev.driver->owner)) + goto error; + sd = i2c_get_clientdata(client); + + /* Register with the v4l2_device which increases the module's + use count as well. */ + if (v4l2_device_register_subdev(v4l2_dev, sd)) + sd = NULL; + /* Decrease the module use count to match the first try_module_get. */ + module_put(client->dev.driver->owner); + +error: + /* If we have a client but no subdev, then something went wrong and + we must unregister the client. */ + if (client && sd == NULL) + i2c_unregister_device(client); + return sd; +} +EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board); + +struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, + struct i2c_adapter *adapter, const char *client_type, + u8 addr, const unsigned short *probe_addrs) +{ + struct i2c_board_info info; + + /* Setup the i2c board info with the device type and + the device address. */ + memset(&info, 0, sizeof(info)); + strlcpy(info.type, client_type, sizeof(info.type)); + info.addr = addr; + + return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, probe_addrs); +} +EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev); + +/* Return i2c client address of v4l2_subdev. */ +unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + return client ? client->addr : I2C_CLIENT_END; +} +EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr); + +/* Return a list of I2C tuner addresses to probe. Use only if the tuner + addresses are unknown. */ +const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type) +{ + static const unsigned short radio_addrs[] = { +#if IS_ENABLED(CONFIG_MEDIA_TUNER_TEA5761) + 0x10, +#endif + 0x60, + I2C_CLIENT_END + }; + static const unsigned short demod_addrs[] = { + 0x42, 0x43, 0x4a, 0x4b, + I2C_CLIENT_END + }; + static const unsigned short tv_addrs[] = { + 0x42, 0x43, 0x4a, 0x4b, /* tda8290 */ + 0x60, 0x61, 0x62, 0x63, 0x64, + I2C_CLIENT_END + }; + + switch (type) { + case ADDRS_RADIO: + return radio_addrs; + case ADDRS_DEMOD: + return demod_addrs; + case ADDRS_TV: + return tv_addrs; + case ADDRS_TV_WITH_DEMOD: + return tv_addrs + 4; + } + return NULL; +} +EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs); + +#endif /* defined(CONFIG_I2C) */ + +#if defined(CONFIG_SPI) + +/* Load an spi sub-device. */ + +void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, + const struct v4l2_subdev_ops *ops) +{ + v4l2_subdev_init(sd, ops); + sd->flags |= V4L2_SUBDEV_FL_IS_SPI; + /* the owner is the same as the spi_device's driver owner */ + sd->owner = spi->dev.driver->owner; + sd->dev = &spi->dev; + /* spi_device and v4l2_subdev point to one another */ + v4l2_set_subdevdata(sd, spi); + spi_set_drvdata(spi, sd); + /* initialize name */ + strlcpy(sd->name, spi->dev.driver->name, sizeof(sd->name)); +} +EXPORT_SYMBOL_GPL(v4l2_spi_subdev_init); + +struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, + struct spi_master *master, struct spi_board_info *info) +{ + struct v4l2_subdev *sd = NULL; + struct spi_device *spi = NULL; + + BUG_ON(!v4l2_dev); + + if (info->modalias[0]) + request_module(info->modalias); + + spi = spi_new_device(master, info); + + if (spi == NULL || spi->dev.driver == NULL) + goto error; + + if (!try_module_get(spi->dev.driver->owner)) + goto error; + + sd = spi_get_drvdata(spi); + + /* Register with the v4l2_device which increases the module's + use count as well. */ + if (v4l2_device_register_subdev(v4l2_dev, sd)) + sd = NULL; + + /* Decrease the module use count to match the first try_module_get. */ + module_put(spi->dev.driver->owner); + +error: + /* If we have a client but no subdev, then something went wrong and + we must unregister the client. */ + if (spi && sd == NULL) + spi_unregister_device(spi); + + return sd; +} +EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev); + +#endif /* defined(CONFIG_SPI) */ + +/* Clamp x to be between min and max, aligned to a multiple of 2^align. min + * and max don't have to be aligned, but there must be at least one valid + * value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples + * of 16 between 17 and 31. */ +static unsigned int clamp_align(unsigned int x, unsigned int min, + unsigned int max, unsigned int align) +{ + /* Bits that must be zero to be aligned */ + unsigned int mask = ~((1 << align) - 1); + + /* Clamp to aligned min and max */ + x = clamp(x, (min + ~mask) & mask, max & mask); + + /* Round to nearest aligned value */ + if (align) + x = (x + (1 << (align - 1))) & mask; + + return x; +} + +/* Bound an image to have a width between wmin and wmax, and height between + * hmin and hmax, inclusive. Additionally, the width will be a multiple of + * 2^walign, the height will be a multiple of 2^halign, and the overall size + * (width*height) will be a multiple of 2^salign. The image may be shrunk + * or enlarged to fit the alignment constraints. + * + * The width or height maximum must not be smaller than the corresponding + * minimum. The alignments must not be so high there are no possible image + * sizes within the allowed bounds. wmin and hmin must be at least 1 + * (don't use 0). If you don't care about a certain alignment, specify 0, + * as 2^0 is 1 and one byte alignment is equivalent to no alignment. If + * you only want to adjust downward, specify a maximum that's the same as + * the initial value. + */ +void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax, + unsigned int walign, + u32 *h, unsigned int hmin, unsigned int hmax, + unsigned int halign, unsigned int salign) +{ + *w = clamp_align(*w, wmin, wmax, walign); + *h = clamp_align(*h, hmin, hmax, halign); + + /* Usually we don't need to align the size and are done now. */ + if (!salign) + return; + + /* How much alignment do we have? */ + walign = __ffs(*w); + halign = __ffs(*h); + /* Enough to satisfy the image alignment? */ + if (walign + halign < salign) { + /* Max walign where there is still a valid width */ + unsigned int wmaxa = __fls(wmax ^ (wmin - 1)); + /* Max halign where there is still a valid height */ + unsigned int hmaxa = __fls(hmax ^ (hmin - 1)); + + /* up the smaller alignment until we have enough */ + do { + if (halign >= hmaxa || + (walign <= halign && walign < wmaxa)) { + *w = clamp_align(*w, wmin, wmax, walign + 1); + walign = __ffs(*w); + } else { + *h = clamp_align(*h, hmin, hmax, halign + 1); + halign = __ffs(*h); + } + } while (halign + walign < salign); + } +} +EXPORT_SYMBOL_GPL(v4l_bound_align_image); + +const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( + const struct v4l2_discrete_probe *probe, + s32 width, s32 height) +{ + int i; + u32 error, min_error = UINT_MAX; + const struct v4l2_frmsize_discrete *size, *best = NULL; + + if (!probe) + return best; + + for (i = 0, size = probe->sizes; i < probe->num_sizes; i++, size++) { + error = abs(size->width - width) + abs(size->height - height); + if (error < min_error) { + min_error = error; + best = size; + } + if (!error) + break; + } + + return best; +} +EXPORT_SYMBOL_GPL(v4l2_find_nearest_format); + +void v4l2_get_timestamp(struct timeval *tv) +{ + struct timespec ts; + + ktime_get_ts(&ts); + tv->tv_sec = ts.tv_sec; + tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC; +} +EXPORT_SYMBOL_GPL(v4l2_get_timestamp);