930e19248e
On suspend/resume cycle, selftest is executed to reset i8042 controller. But when this is done in Asus devices, subsequent calls to detect/init functions to elantech driver fails. Skipping selftest fixes this problem. An easier step to reproduce this problem is adding i8042.reset=1 as a kernel parameter. On Asus laptops, it'll make the system to start with the touchpad already stuck, since psmouse_probe forcibly calls the selftest function. This patch was inspired by John Hiesey's change[1], but, since this problem affects a lot of models of Asus, let's avoid running selftests on them. All models affected by this problem: A455LD K401LB K501LB K501LX R409L V502LX X302LA X450LCP X450LD X455LAB X455LDB X455LF Z450LA [1]: https://marc.info/?l=linux-input&m=144312209020616&w=2 Fixes: "ETPS/2 Elantech Touchpad dies after resume from suspend" (https://bugzilla.kernel.org/show_bug.cgi?id=107971) Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
#ifndef _I8042_SPARCIO_H
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#define _I8042_SPARCIO_H
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#include <linux/of_device.h>
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#include <asm/io.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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static int i8042_kbd_irq = -1;
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static int i8042_aux_irq = -1;
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#define I8042_KBD_IRQ i8042_kbd_irq
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#define I8042_AUX_IRQ i8042_aux_irq
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#define I8042_KBD_PHYS_DESC "sparcps2/serio0"
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#define I8042_AUX_PHYS_DESC "sparcps2/serio1"
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#define I8042_MUX_PHYS_DESC "sparcps2/serio%d"
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static void __iomem *kbd_iobase;
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#define I8042_COMMAND_REG (kbd_iobase + 0x64UL)
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#define I8042_DATA_REG (kbd_iobase + 0x60UL)
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static inline int i8042_read_data(void)
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{
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return readb(kbd_iobase + 0x60UL);
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}
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static inline int i8042_read_status(void)
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{
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return readb(kbd_iobase + 0x64UL);
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}
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static inline void i8042_write_data(int val)
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{
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writeb(val, kbd_iobase + 0x60UL);
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}
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static inline void i8042_write_command(int val)
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{
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writeb(val, kbd_iobase + 0x64UL);
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}
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#ifdef CONFIG_PCI
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static struct resource *kbd_res;
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#define OBP_PS2KBD_NAME1 "kb_ps2"
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#define OBP_PS2KBD_NAME2 "keyboard"
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#define OBP_PS2MS_NAME1 "kdmouse"
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#define OBP_PS2MS_NAME2 "mouse"
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static int sparc_i8042_probe(struct platform_device *op)
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{
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struct device_node *dp = op->dev.of_node;
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dp = dp->child;
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while (dp) {
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if (!strcmp(dp->name, OBP_PS2KBD_NAME1) ||
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!strcmp(dp->name, OBP_PS2KBD_NAME2)) {
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struct platform_device *kbd = of_find_device_by_node(dp);
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unsigned int irq = kbd->archdata.irqs[0];
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if (irq == 0xffffffff)
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irq = op->archdata.irqs[0];
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i8042_kbd_irq = irq;
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kbd_iobase = of_ioremap(&kbd->resource[0],
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0, 8, "kbd");
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kbd_res = &kbd->resource[0];
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} else if (!strcmp(dp->name, OBP_PS2MS_NAME1) ||
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!strcmp(dp->name, OBP_PS2MS_NAME2)) {
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struct platform_device *ms = of_find_device_by_node(dp);
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unsigned int irq = ms->archdata.irqs[0];
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if (irq == 0xffffffff)
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irq = op->archdata.irqs[0];
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i8042_aux_irq = irq;
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}
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dp = dp->sibling;
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}
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return 0;
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}
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static int sparc_i8042_remove(struct platform_device *op)
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{
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of_iounmap(kbd_res, kbd_iobase, 8);
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return 0;
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}
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static const struct of_device_id sparc_i8042_match[] = {
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{
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.name = "8042",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, sparc_i8042_match);
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static struct platform_driver sparc_i8042_driver = {
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.driver = {
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.name = "i8042",
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.of_match_table = sparc_i8042_match,
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},
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.probe = sparc_i8042_probe,
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.remove = sparc_i8042_remove,
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};
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static int __init i8042_platform_init(void)
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{
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struct device_node *root = of_find_node_by_path("/");
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if (!strcmp(root->name, "SUNW,JavaStation-1")) {
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/* Hardcoded values for MrCoffee. */
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i8042_kbd_irq = i8042_aux_irq = 13 | 0x20;
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kbd_iobase = ioremap(0x71300060, 8);
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if (!kbd_iobase)
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return -ENODEV;
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} else {
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int err = platform_driver_register(&sparc_i8042_driver);
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if (err)
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return err;
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if (i8042_kbd_irq == -1 ||
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i8042_aux_irq == -1) {
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if (kbd_iobase) {
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of_iounmap(kbd_res, kbd_iobase, 8);
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kbd_iobase = (void __iomem *) NULL;
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}
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return -ENODEV;
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}
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}
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i8042_reset = I8042_RESET_ALWAYS;
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return 0;
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}
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static inline void i8042_platform_exit(void)
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{
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struct device_node *root = of_find_node_by_path("/");
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if (strcmp(root->name, "SUNW,JavaStation-1"))
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platform_driver_unregister(&sparc_i8042_driver);
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}
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#else /* !CONFIG_PCI */
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static int __init i8042_platform_init(void)
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{
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return -ENODEV;
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}
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static inline void i8042_platform_exit(void)
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{
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}
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#endif /* !CONFIG_PCI */
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#endif /* _I8042_SPARCIO_H */
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