diff options
Diffstat (limited to 'arch/x86/platform/olpc/olpc-xo1-sci.c')
| -rw-r--r-- | arch/x86/platform/olpc/olpc-xo1-sci.c | 183 |
1 files changed, 182 insertions, 1 deletions
diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c index 8fbf961dae8..63f50506078 100644 --- a/arch/x86/platform/olpc/olpc-xo1-sci.c +++ b/arch/x86/platform/olpc/olpc-xo1-sci.c @@ -12,12 +12,15 @@ */ #include <linux/cs5535.h> +#include <linux/device.h> +#include <linux/gpio.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/mfd/core.h> #include <linux/suspend.h> +#include <linux/workqueue.h> #include <asm/io.h> #include <asm/msr.h> @@ -28,8 +31,60 @@ static unsigned long acpi_base; static struct input_dev *power_button_idev; +static struct input_dev *ebook_switch_idev; + static int sci_irq; +/* Report current ebook switch state through input layer */ +static void send_ebook_state(void) +{ + unsigned char state; + + if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) { + pr_err(PFX "failed to get ebook state\n"); + return; + } + + input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state); + input_sync(ebook_switch_idev); +} + +/* + * Process all items in the EC's SCI queue. + * + * This is handled in a workqueue because olpc_ec_cmd can be slow (and + * can even timeout). + * + * If propagate_events is false, the queue is drained without events being + * generated for the interrupts. + */ +static void process_sci_queue(bool propagate_events) +{ + int r; + u16 data; + + do { + r = olpc_ec_sci_query(&data); + if (r || !data) + break; + + pr_debug(PFX "SCI 0x%x received\n", data); + + if (data == EC_SCI_SRC_EBOOK && propagate_events) + send_ebook_state(); + } while (data); + + if (r) + pr_err(PFX "Failed to clear SCI queue"); +} + +static void process_sci_queue_work(struct work_struct *work) +{ + process_sci_queue(true); +} + +static DECLARE_WORK(sci_work, process_sci_queue_work); + static irqreturn_t xo1_sci_intr(int irq, void *dev_id) { struct platform_device *pdev = dev_id; @@ -51,6 +106,11 @@ static irqreturn_t xo1_sci_intr(int irq, void *dev_id) input_sync(power_button_idev); } + if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */ + cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS); + schedule_work(&sci_work); + } + return IRQ_HANDLED; } @@ -60,6 +120,19 @@ static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state) olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN); else olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN); + + if (device_may_wakeup(&ebook_switch_idev->dev)) + olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK); + else + olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK); + + return 0; +} + +static int xo1_sci_resume(struct platform_device *pdev) +{ + /* Enable all EC events */ + olpc_ec_mask_write(EC_SCI_SRC_ALL); return 0; } @@ -104,6 +177,50 @@ static int __devinit setup_sci_interrupt(struct platform_device *pdev) return r; } +static int __devinit setup_ec_sci(void) +{ + int r; + + r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI"); + if (r) + return r; + + gpio_direction_input(OLPC_GPIO_ECSCI); + + /* Clear pending EC SCI events */ + cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS); + cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS); + + /* + * Enable EC SCI events, and map them to both a PME and the SCI + * interrupt. + * + * Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can + * be mapped to regular interrupts *or* Geode-specific Power + * Management Events (PMEs) - events that bring the system out of + * suspend. In this case, we want both of those things - the system + * wakeup, *and* the ability to get an interrupt when an event occurs. + * + * To achieve this, we map the GPIO to a PME, and then we use one + * of the many generic knobs on the CS5535 PIC to additionally map the + * PME to the regular SCI interrupt line. + */ + cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE); + + /* Set the SCI to cause a PME event on group 7 */ + cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1); + + /* And have group 7 also fire the SCI interrupt */ + cs5535_pic_unreqz_select_high(7, sci_irq); + + return 0; +} + +static void free_ec_sci(void) +{ + gpio_free(OLPC_GPIO_ECSCI); +} + static int __devinit setup_power_button(struct platform_device *pdev) { int r; @@ -135,6 +252,37 @@ static void free_power_button(void) input_free_device(power_button_idev); } +static int __devinit setup_ebook_switch(struct platform_device *pdev) +{ + int r; + + ebook_switch_idev = input_allocate_device(); + if (!ebook_switch_idev) + return -ENOMEM; + + ebook_switch_idev->name = "EBook Switch"; + ebook_switch_idev->phys = DRV_NAME "/input1"; + set_bit(EV_SW, ebook_switch_idev->evbit); + set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit); + + ebook_switch_idev->dev.parent = &pdev->dev; + device_set_wakeup_capable(&ebook_switch_idev->dev, true); + + r = input_register_device(ebook_switch_idev); + if (r) { + dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r); + input_free_device(ebook_switch_idev); + } + + return r; +} + +static void free_ebook_switch(void) +{ + input_unregister_device(ebook_switch_idev); + input_free_device(ebook_switch_idev); +} + static int __devinit xo1_sci_probe(struct platform_device *pdev) { struct resource *res; @@ -159,10 +307,39 @@ static int __devinit xo1_sci_probe(struct platform_device *pdev) if (r) return r; + r = setup_ebook_switch(pdev); + if (r) + goto err_ebook; + + r = setup_ec_sci(); + if (r) + goto err_ecsci; + + /* Enable PME generation for EC-generated events */ + outl(CS5536_GPIOM7_PME_EN, acpi_base + CS5536_PM_GPE0_EN); + + /* Clear pending events */ + outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS); + process_sci_queue(false); + + /* Initial sync */ + send_ebook_state(); + r = setup_sci_interrupt(pdev); if (r) - free_power_button(); + goto err_sci; + /* Enable all EC events */ + olpc_ec_mask_write(EC_SCI_SRC_ALL); + + return r; + +err_sci: + free_ec_sci(); +err_ecsci: + free_ebook_switch(); +err_ebook: + free_power_button(); return r; } @@ -170,6 +347,9 @@ static int __devexit xo1_sci_remove(struct platform_device *pdev) { mfd_cell_disable(pdev); free_irq(sci_irq, pdev); + cancel_work_sync(&sci_work); + free_ec_sci(); + free_ebook_switch(); free_power_button(); acpi_base = 0; return 0; @@ -182,6 +362,7 @@ static struct platform_driver xo1_sci_driver = { .probe = xo1_sci_probe, .remove = __devexit_p(xo1_sci_remove), .suspend = xo1_sci_suspend, + .resume = xo1_sci_resume, }; static int __init xo1_sci_init(void) |