x86, olpc-xo1-sci: Add GPE handler and ebook switch functionality
The EC in the OLPC XO-1 delivers GPE events to provide various notifications. Add the basic code for GPE/EC event processing and enable the ebook switch, which can be used as a wakeup source. Signed-off-by: Daniel Drake <dsd@laptop.org> Link: http://lkml.kernel.org/r/1309019658-1712-8-git-send-email-dsd@laptop.org Acked-by: Andres Salomon <dilinger@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Daniel Drake
@@ -12,12 +12,15 @@
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*/
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#include <linux/cs5535.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/mfd/core.h>
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#include <linux/suspend.h>
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#include <linux/workqueue.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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@@ -28,8 +31,60 @@
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static unsigned long acpi_base;
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static struct input_dev *power_button_idev;
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static struct input_dev *ebook_switch_idev;
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static int sci_irq;
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/* Report current ebook switch state through input layer */
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static void send_ebook_state(void)
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{
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unsigned char state;
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if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) {
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pr_err(PFX "failed to get ebook state\n");
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return;
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}
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input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
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input_sync(ebook_switch_idev);
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}
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/*
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* Process all items in the EC's SCI queue.
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*
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* This is handled in a workqueue because olpc_ec_cmd can be slow (and
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* can even timeout).
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*
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* If propagate_events is false, the queue is drained without events being
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* generated for the interrupts.
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*/
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static void process_sci_queue(bool propagate_events)
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{
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int r;
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u16 data;
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do {
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r = olpc_ec_sci_query(&data);
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if (r || !data)
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break;
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pr_debug(PFX "SCI 0x%x received\n", data);
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if (data == EC_SCI_SRC_EBOOK && propagate_events)
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send_ebook_state();
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} while (data);
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if (r)
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pr_err(PFX "Failed to clear SCI queue");
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}
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static void process_sci_queue_work(struct work_struct *work)
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{
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process_sci_queue(true);
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}
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static DECLARE_WORK(sci_work, process_sci_queue_work);
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static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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@@ -51,6 +106,11 @@ static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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input_sync(power_button_idev);
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}
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if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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schedule_work(&sci_work);
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}
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return IRQ_HANDLED;
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}
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@@ -60,6 +120,19 @@ static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
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olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
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else
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olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
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if (device_may_wakeup(&ebook_switch_idev->dev))
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olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK);
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else
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olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK);
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return 0;
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}
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static int xo1_sci_resume(struct platform_device *pdev)
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{
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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return 0;
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}
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@@ -104,6 +177,50 @@ static int __devinit setup_sci_interrupt(struct platform_device *pdev)
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return r;
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}
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static int __devinit setup_ec_sci(void)
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{
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int r;
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r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI");
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if (r)
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return r;
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gpio_direction_input(OLPC_GPIO_ECSCI);
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/* Clear pending EC SCI events */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS);
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/*
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* Enable EC SCI events, and map them to both a PME and the SCI
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* interrupt.
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*
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* Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can
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* be mapped to regular interrupts *or* Geode-specific Power
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* Management Events (PMEs) - events that bring the system out of
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* suspend. In this case, we want both of those things - the system
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* wakeup, *and* the ability to get an interrupt when an event occurs.
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*
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* To achieve this, we map the GPIO to a PME, and then we use one
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* of the many generic knobs on the CS5535 PIC to additionally map the
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* PME to the regular SCI interrupt line.
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*/
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE);
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/* Set the SCI to cause a PME event on group 7 */
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cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1);
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/* And have group 7 also fire the SCI interrupt */
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cs5535_pic_unreqz_select_high(7, sci_irq);
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return 0;
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}
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static void free_ec_sci(void)
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{
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gpio_free(OLPC_GPIO_ECSCI);
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}
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static int __devinit setup_power_button(struct platform_device *pdev)
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{
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int r;
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@@ -135,6 +252,37 @@ static void free_power_button(void)
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input_free_device(power_button_idev);
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}
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static int __devinit setup_ebook_switch(struct platform_device *pdev)
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{
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int r;
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ebook_switch_idev = input_allocate_device();
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if (!ebook_switch_idev)
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return -ENOMEM;
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ebook_switch_idev->name = "EBook Switch";
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ebook_switch_idev->phys = DRV_NAME "/input1";
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set_bit(EV_SW, ebook_switch_idev->evbit);
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set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit);
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ebook_switch_idev->dev.parent = &pdev->dev;
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device_set_wakeup_capable(&ebook_switch_idev->dev, true);
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r = input_register_device(ebook_switch_idev);
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if (r) {
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dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r);
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input_free_device(ebook_switch_idev);
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}
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return r;
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}
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static void free_ebook_switch(void)
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{
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input_unregister_device(ebook_switch_idev);
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input_free_device(ebook_switch_idev);
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}
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static int __devinit xo1_sci_probe(struct platform_device *pdev)
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{
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struct resource *res;
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@@ -159,10 +307,39 @@ static int __devinit xo1_sci_probe(struct platform_device *pdev)
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if (r)
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return r;
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r = setup_ebook_switch(pdev);
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if (r)
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goto err_ebook;
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r = setup_ec_sci();
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if (r)
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goto err_ecsci;
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/* Enable PME generation for EC-generated events */
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outl(CS5536_GPIOM7_PME_EN, acpi_base + CS5536_PM_GPE0_EN);
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/* Clear pending events */
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outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
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process_sci_queue(false);
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/* Initial sync */
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send_ebook_state();
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r = setup_sci_interrupt(pdev);
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if (r)
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free_power_button();
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goto err_sci;
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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return r;
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err_sci:
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free_ec_sci();
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err_ecsci:
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free_ebook_switch();
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err_ebook:
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free_power_button();
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return r;
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}
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@@ -170,6 +347,9 @@ static int __devexit xo1_sci_remove(struct platform_device *pdev)
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{
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mfd_cell_disable(pdev);
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free_irq(sci_irq, pdev);
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cancel_work_sync(&sci_work);
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free_ec_sci();
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free_ebook_switch();
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free_power_button();
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acpi_base = 0;
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return 0;
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@@ -182,6 +362,7 @@ static struct platform_driver xo1_sci_driver = {
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.probe = xo1_sci_probe,
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.remove = __devexit_p(xo1_sci_remove),
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.suspend = xo1_sci_suspend,
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.resume = xo1_sci_resume,
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};
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static int __init xo1_sci_init(void)
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