i2c: parport-light: remove driver
The justification of a light version of the parport driver was less overhead for embedded systems. Well, today, even if an embedded system still has a parport, it surely can handle the fully-fledged parport driver. Remove it to reduce the maintenance burden. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Wolfram Sang
Wolfram Sang
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Коммит
710b65335c
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@ -1,24 +0,0 @@
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===============================
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Kernel driver i2c-parport-light
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===============================
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Author: Jean Delvare <jdelvare@suse.de>
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This driver is a light version of i2c-parport. It doesn't depend
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on the parport driver, and uses direct I/O access instead. This might be
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preferred on embedded systems where wasting memory for the clean but heavy
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parport handling is not an option. The drawback is a reduced portability
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and the impossibility to daisy-chain other parallel port devices.
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Please see i2c-parport for documentation.
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Module parameters:
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* type: type of adapter (see i2c-parport or modinfo)
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* base: base I/O address
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Default is 0x378 which is fairly common for parallel ports, at least on PC.
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* irq: optional IRQ
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This must be passed if you want SMBus alert support, assuming your adapter
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actually supports this.
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@ -20,7 +20,6 @@ I2C Bus Drivers
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i2c-nforce2
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i2c-nvidia-gpu
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i2c-ocores
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i2c-parport-light
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i2c-parport
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i2c-pca-isa
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i2c-piix4
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@ -7720,9 +7720,7 @@ M: Jean Delvare <jdelvare@suse.com>
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L: linux-i2c@vger.kernel.org
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S: Maintained
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F: Documentation/i2c/busses/i2c-parport.rst
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F: Documentation/i2c/busses/i2c-parport-light.rst
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F: drivers/i2c/busses/i2c-parport.c
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F: drivers/i2c/busses/i2c-parport-light.c
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I2C SUBSYSTEM
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M: Wolfram Sang <wsa@the-dreams.de>
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@ -1211,37 +1211,9 @@ config I2C_PARPORT
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An adapter type parameter is now mandatory. Please read the file
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Documentation/i2c/busses/i2c-parport.rst for details.
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Another driver exists, named i2c-parport-light, which doesn't depend
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on the parport driver. This is meant for embedded systems. Don't say
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Y here if you intend to say Y or M there.
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This support is also available as a module. If so, the module
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will be called i2c-parport.
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config I2C_PARPORT_LIGHT
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tristate "Parallel port adapter (light)"
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select I2C_ALGOBIT
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select I2C_SMBUS
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help
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This supports parallel port I2C adapters such as the ones made by
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Philips or Velleman, Analog Devices evaluation boards, and more.
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Basically any adapter using the parallel port as an I2C bus with
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no extra chipset is supported by this driver, or could be.
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This driver is a light version of i2c-parport. It doesn't depend
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on the parport driver, and uses direct I/O access instead. This
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might be preferred on embedded systems where wasting memory for
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the clean but heavy parport handling is not an option. The
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drawback is a reduced portability and the impossibility to
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daisy-chain other parallel port devices.
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Don't say Y here if you said Y or M to i2c-parport. Saying M to
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both is possible but both modules should not be loaded at the same
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time.
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This support is also available as a module. If so, the module
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will be called i2c-parport-light.
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config I2C_ROBOTFUZZ_OSIF
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tristate "RobotFuzz Open Source InterFace USB adapter"
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depends on USB
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@ -128,7 +128,6 @@ obj-$(CONFIG_I2C_ZX2967) += i2c-zx2967.o
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obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
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obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
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obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
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obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
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obj-$(CONFIG_I2C_ROBOTFUZZ_OSIF) += i2c-robotfuzz-osif.o
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obj-$(CONFIG_I2C_TAOS_EVM) += i2c-taos-evm.o
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obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
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@ -1,267 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* ------------------------------------------------------------------------ *
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* i2c-parport-light.c I2C bus over parallel port *
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* ------------------------------------------------------------------------ *
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Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de>
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Based on older i2c-velleman.c driver
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Copyright (C) 1995-2000 Simon G. Vogl
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With some changes from:
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Frodo Looijaard <frodol@dds.nl>
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Kyösti Mälkki <kmalkki@cc.hut.fi>
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* ------------------------------------------------------------------------ */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/ioport.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <linux/i2c-smbus.h>
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#include <linux/io.h>
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#include "i2c-parport.h"
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#define DEFAULT_BASE 0x378
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#define DRVNAME "i2c-parport-light"
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static struct platform_device *pdev;
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static u16 base;
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module_param_hw(base, ushort, ioport, 0);
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MODULE_PARM_DESC(base, "Base I/O address");
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static int irq;
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module_param_hw(irq, int, irq, 0);
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MODULE_PARM_DESC(irq, "IRQ (optional)");
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/* ----- Low-level parallel port access ----------------------------------- */
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static inline void port_write(unsigned char p, unsigned char d)
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{
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outb(d, base+p);
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}
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static inline unsigned char port_read(unsigned char p)
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{
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return inb(base+p);
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}
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/* ----- Unified line operation functions --------------------------------- */
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static inline void line_set(int state, const struct lineop *op)
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{
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u8 oldval = port_read(op->port);
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/* Touch only the bit(s) needed */
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if ((op->inverted && !state) || (!op->inverted && state))
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port_write(op->port, oldval | op->val);
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else
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port_write(op->port, oldval & ~op->val);
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}
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static inline int line_get(const struct lineop *op)
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{
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u8 oldval = port_read(op->port);
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return ((op->inverted && (oldval & op->val) != op->val)
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|| (!op->inverted && (oldval & op->val) == op->val));
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}
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/* ----- I2C algorithm call-back functions and structures ----------------- */
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static void parport_setscl(void *data, int state)
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{
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line_set(state, &adapter_parm[type].setscl);
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}
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static void parport_setsda(void *data, int state)
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{
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line_set(state, &adapter_parm[type].setsda);
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}
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static int parport_getscl(void *data)
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{
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return line_get(&adapter_parm[type].getscl);
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}
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static int parport_getsda(void *data)
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{
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return line_get(&adapter_parm[type].getsda);
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}
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/* Encapsulate the functions above in the correct structure
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Note that getscl will be set to NULL by the attaching code for adapters
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that cannot read SCL back */
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static struct i2c_algo_bit_data parport_algo_data = {
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.setsda = parport_setsda,
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.setscl = parport_setscl,
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.getsda = parport_getsda,
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.getscl = parport_getscl,
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.udelay = 50,
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.timeout = HZ,
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};
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/* ----- Driver registration ---------------------------------------------- */
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static struct i2c_adapter parport_adapter = {
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.owner = THIS_MODULE,
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.class = I2C_CLASS_HWMON,
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.algo_data = &parport_algo_data,
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.name = "Parallel port adapter (light)",
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};
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/* SMBus alert support */
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static struct i2c_smbus_alert_setup alert_data = {
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};
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static struct i2c_client *ara;
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static struct lineop parport_ctrl_irq = {
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.val = (1 << 4),
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.port = PORT_CTRL,
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};
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static int i2c_parport_probe(struct platform_device *pdev)
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{
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int err;
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/* Reset hardware to a sane state (SCL and SDA high) */
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parport_setsda(NULL, 1);
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parport_setscl(NULL, 1);
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/* Other init if needed (power on...) */
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if (adapter_parm[type].init.val) {
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line_set(1, &adapter_parm[type].init);
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/* Give powered devices some time to settle */
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msleep(100);
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}
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parport_adapter.dev.parent = &pdev->dev;
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err = i2c_bit_add_bus(&parport_adapter);
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if (err) {
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dev_err(&pdev->dev, "Unable to register with I2C\n");
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return err;
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}
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/* Setup SMBus alert if supported */
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if (adapter_parm[type].smbus_alert && irq) {
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alert_data.irq = irq;
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ara = i2c_setup_smbus_alert(&parport_adapter, &alert_data);
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if (ara)
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line_set(1, &parport_ctrl_irq);
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else
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dev_warn(&pdev->dev, "Failed to register ARA client\n");
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}
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return 0;
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}
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static int i2c_parport_remove(struct platform_device *pdev)
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{
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if (ara) {
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line_set(0, &parport_ctrl_irq);
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i2c_unregister_device(ara);
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ara = NULL;
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}
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i2c_del_adapter(&parport_adapter);
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/* Un-init if needed (power off...) */
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if (adapter_parm[type].init.val)
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line_set(0, &adapter_parm[type].init);
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return 0;
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}
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static struct platform_driver i2c_parport_driver = {
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.driver = {
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.name = DRVNAME,
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},
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.probe = i2c_parport_probe,
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.remove = i2c_parport_remove,
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};
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static int __init i2c_parport_device_add(u16 address)
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{
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int err;
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pdev = platform_device_alloc(DRVNAME, -1);
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if (!pdev) {
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err = -ENOMEM;
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printk(KERN_ERR DRVNAME ": Device allocation failed\n");
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goto exit;
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}
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err = platform_device_add(pdev);
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if (err) {
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printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
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err);
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goto exit_device_put;
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}
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return 0;
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exit_device_put:
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platform_device_put(pdev);
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exit:
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return err;
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}
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static int __init i2c_parport_init(void)
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{
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int err;
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if (type < 0) {
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printk(KERN_ERR DRVNAME ": adapter type unspecified\n");
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return -ENODEV;
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}
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if (type >= ARRAY_SIZE(adapter_parm)) {
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printk(KERN_ERR DRVNAME ": invalid type (%d)\n", type);
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return -ENODEV;
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}
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if (base == 0) {
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pr_info(DRVNAME ": using default base 0x%x\n", DEFAULT_BASE);
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base = DEFAULT_BASE;
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}
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if (!request_region(base, 3, DRVNAME))
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return -EBUSY;
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if (irq != 0)
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pr_info(DRVNAME ": using irq %d\n", irq);
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if (!adapter_parm[type].getscl.val)
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parport_algo_data.getscl = NULL;
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/* Sets global pdev as a side effect */
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err = i2c_parport_device_add(base);
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if (err)
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goto exit_release;
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err = platform_driver_register(&i2c_parport_driver);
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if (err)
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goto exit_device;
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return 0;
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exit_device:
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platform_device_unregister(pdev);
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exit_release:
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release_region(base, 3);
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return err;
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}
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static void __exit i2c_parport_exit(void)
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{
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platform_driver_unregister(&i2c_parport_driver);
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platform_device_unregister(pdev);
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release_region(base, 3);
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}
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("I2C bus over parallel port (light)");
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MODULE_LICENSE("GPL");
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module_init(i2c_parport_init);
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module_exit(i2c_parport_exit);
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