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SubjectRe: [PATCH] [media] dvb-usb/dvb-usb-v2: use IS_REACHABLE
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On Fri, 2015-04-10 at 22:28 +0200, Arnd Bergmann wrote:
> Tha ARM randconfig builds came up with another rare build
> failure for the dib3000mc driver, when dibusb is built-in
> and dib3000mc is a loadable module:
>
> ERROR: "dibusb_dib3000mc_frontend_attach" [drivers/media/usb/dvb-usb/dvb-usb-nova-t-usb2.ko] undefined!
> ERROR: "dibusb_dib3000mc_tuner_attach" [drivers/media/usb/dvb-usb/dvb-usb-nova-t-usb2.ko] undefined!
>
> Apparently this used to be a valid configuration (build-time,
> not run-time), but broke as part of a cleanup.
> I tried reverting the cleanup, but saw that the code was still
> wrong then. This tries to fix the code properly, by moving the
> problematic functions into a new file that now is built as a
> loadable module or built-in, whichever is correct for a particular
> configuration. It fixes the regression as well as the run-time
> problem that already existed before.
>
> I have also checked the two other files that were changed in
> the original cleanup, and found them to be correct in either
> version, so I do not touch that part.
>
> As this is a rather obscure bug, there is no need for backports.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 028c70ff42783 ("[media] dvb-usb/dvb-usb-v2: use IS_ENABLED")
> ---
> drivers/media/usb/dvb-usb/Kconfig | 20 +++-
> drivers/media/usb/dvb-usb/Makefile | 3 +
> drivers/media/usb/dvb-usb/dibusb-common.c | 158 -------------------------
> drivers/media/usb/dvb-usb/dibusb-mc-common.c | 168 +++++++++++++++++++++++++++
> 4 files changed, 186 insertions(+), 163 deletions(-)

(dibusb-mc-common.c is a new file, so you'd expect here a line reading
create mode 100644 drivers/media/usb/dvb-usb/dibusb-mc-common.c

Or do not all versions of git do that?)

> --- a/drivers/media/usb/dvb-usb/Kconfig
> +++ b/drivers/media/usb/dvb-usb/Kconfig

> +config DVB_USB_DIB3000MC
> + tristate
> + depends on DVB_USB
> + select DVB_DIB3000MC
> + help
> + This is a module with helper functions for accessing the
> + DIB3000MC from USB DVB devices. It must be a separate module
> + in case DVB_USB is built-in and DVB_DIB3000MC is a module,
> + and gets selected automatically when needed.

> --- a/drivers/media/usb/dvb-usb/Makefile
> +++ b/drivers/media/usb/dvb-usb/Makefile

> +dvb-usb-dibusb-mc-common-objs := dibusb-mc-common.o
> +obj-$(CONFIG_DVB_USB_DIB3000MC) += dvb-usb-dibusb-mc-common.o

To make sure I'm reading this change correctly: this will create a
module named dvb-usb-dibusb-mc-common.ko if DVB_USB_DIB3000MC is set to
'm', right?

(If I'm wrong you can stop reading here.)

> --- /dev/null
> +++ b/drivers/media/usb/dvb-usb/dibusb-mc-common.c
> @@ -0,0 +1,168 @@
> +/* Common methods for dibusb-based-receivers.
> + *
> + * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
> + *
> + * 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, version 2.
> + *
> + * see Documentation/dvb/README.dvb-usb for more information
> + */
> +
> +#include <linux/kconfig.h>
> +#include "dibusb.h"
> +
> +/* 3000MC/P stuff */
> +// Config Adjacent channels Perf -cal22
> +static struct dibx000_agc_config dib3000p_mt2060_agc_config = {
> + .band_caps = BAND_VHF | BAND_UHF,
> + .setup = (1 << 8) | (5 << 5) | (1 << 4) | (1 << 3) | (0 << 2) | (2 << 0),
> +
> + .agc1_max = 48497,
> + .agc1_min = 23593,
> + .agc2_max = 46531,
> + .agc2_min = 24904,
> +
> + .agc1_pt1 = 0x65,
> + .agc1_pt2 = 0x69,
> +
> + .agc1_slope1 = 0x51,
> + .agc1_slope2 = 0x27,
> +
> + .agc2_pt1 = 0,
> + .agc2_pt2 = 0x33,
> +
> + .agc2_slope1 = 0x35,
> + .agc2_slope2 = 0x37,
> +};
> +
> +static struct dib3000mc_config stk3000p_dib3000p_config = {
> + &dib3000p_mt2060_agc_config,
> +
> + .max_time = 0x196,
> + .ln_adc_level = 0x1cc7,
> +
> + .output_mpeg2_in_188_bytes = 1,
> +
> + .agc_command1 = 1,
> + .agc_command2 = 1,
> +};
> +
> +static struct dibx000_agc_config dib3000p_panasonic_agc_config = {
> + .band_caps = BAND_VHF | BAND_UHF,
> + .setup = (1 << 8) | (5 << 5) | (1 << 4) | (1 << 3) | (0 << 2) | (2 << 0),
> +
> + .agc1_max = 56361,
> + .agc1_min = 22282,
> + .agc2_max = 47841,
> + .agc2_min = 36045,
> +
> + .agc1_pt1 = 0x3b,
> + .agc1_pt2 = 0x6b,
> +
> + .agc1_slope1 = 0x55,
> + .agc1_slope2 = 0x1d,
> +
> + .agc2_pt1 = 0,
> + .agc2_pt2 = 0x0a,
> +
> + .agc2_slope1 = 0x95,
> + .agc2_slope2 = 0x1e,
> +};
> +
> +static struct dib3000mc_config mod3000p_dib3000p_config = {
> + &dib3000p_panasonic_agc_config,
> +
> + .max_time = 0x51,
> + .ln_adc_level = 0x1cc7,
> +
> + .output_mpeg2_in_188_bytes = 1,
> +
> + .agc_command1 = 1,
> + .agc_command2 = 1,
> +};
> +
> +int dibusb_dib3000mc_frontend_attach(struct dvb_usb_adapter *adap)
> +{
> + if (le16_to_cpu(adap->dev->udev->descriptor.idVendor) == USB_VID_LITEON &&
> + le16_to_cpu(adap->dev->udev->descriptor.idProduct) ==
> + USB_PID_LITEON_DVB_T_WARM) {
> + msleep(1000);
> + }
> +
> + adap->fe_adap[0].fe = dvb_attach(dib3000mc_attach,
> + &adap->dev->i2c_adap,
> + DEFAULT_DIB3000P_I2C_ADDRESS,
> + &mod3000p_dib3000p_config);
> + if ((adap->fe_adap[0].fe) == NULL)
> + adap->fe_adap[0].fe = dvb_attach(dib3000mc_attach,
> + &adap->dev->i2c_adap,
> + DEFAULT_DIB3000MC_I2C_ADDRESS,
> + &mod3000p_dib3000p_config);
> + if ((adap->fe_adap[0].fe) != NULL) {
> + if (adap->priv != NULL) {
> + struct dibusb_state *st = adap->priv;
> + st->ops.pid_parse = dib3000mc_pid_parse;
> + st->ops.pid_ctrl = dib3000mc_pid_control;
> + }
> + return 0;
> + }
> + return -ENODEV;
> +}
> +EXPORT_SYMBOL(dibusb_dib3000mc_frontend_attach);
> +
> +static struct mt2060_config stk3000p_mt2060_config = {
> + 0x60
> +};
> +
> +int dibusb_dib3000mc_tuner_attach(struct dvb_usb_adapter *adap)
> +{
> + struct dibusb_state *st = adap->priv;
> + u8 a,b;
> + u16 if1 = 1220;
> + struct i2c_adapter *tun_i2c;
> +
> + // First IF calibration for Liteon Sticks
> + if (le16_to_cpu(adap->dev->udev->descriptor.idVendor) == USB_VID_LITEON &&
> + le16_to_cpu(adap->dev->udev->descriptor.idProduct) == USB_PID_LITEON_DVB_T_WARM) {
> +
> + dibusb_read_eeprom_byte(adap->dev,0x7E,&a);
> + dibusb_read_eeprom_byte(adap->dev,0x7F,&b);
> +
> + if (a == 0x00)
> + if1 += b;
> + else if (a == 0x80)
> + if1 -= b;
> + else
> + warn("LITE-ON DVB-T: Strange IF1 calibration :%2X %2X\n", a, b);
> +
> + } else if (le16_to_cpu(adap->dev->udev->descriptor.idVendor) == USB_VID_DIBCOM &&
> + le16_to_cpu(adap->dev->udev->descriptor.idProduct) == USB_PID_DIBCOM_MOD3001_WARM) {
> + u8 desc;
> + dibusb_read_eeprom_byte(adap->dev, 7, &desc);
> + if (desc == 2) {
> + a = 127;
> + do {
> + dibusb_read_eeprom_byte(adap->dev, a, &desc);
> + a--;
> + } while (a > 7 && (desc == 0xff || desc == 0x00));
> + if (desc & 0x80)
> + if1 -= (0xff - desc);
> + else
> + if1 += desc;
> + }
> + }
> +
> + tun_i2c = dib3000mc_get_tuner_i2c_master(adap->fe_adap[0].fe, 1);
> + if (dvb_attach(mt2060_attach, adap->fe_adap[0].fe, tun_i2c, &stk3000p_mt2060_config, if1) == NULL) {
> + /* not found - use panasonic pll parameters */
> + if (dvb_attach(dvb_pll_attach, adap->fe_adap[0].fe, 0x60, tun_i2c, DVB_PLL_ENV57H1XD5) == NULL)
> + return -ENOMEM;
> + } else {
> + st->mt2060_present = 1;
> + /* set the correct parameters for the dib3000p */
> + dib3000mc_set_config(adap->fe_adap[0].fe, &stk3000p_dib3000p_config);
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL(dibusb_dib3000mc_tuner_attach);

But without a MODULE_LICENSE() macro loading that module will taint the
kernel (see set_license() in kernel/module.c). So, although it seems
this driver can do without most of the usual module boilerplate, a
MODULE_LICENSE() macro would still be needed.


Paul Bolle



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