Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932188Ab1D3NBw (ORCPT ); Sat, 30 Apr 2011 09:01:52 -0400 Received: from queueout02-winn.ispmail.ntl.com ([81.103.221.56]:9429 "EHLO queueout02-winn.ispmail.ntl.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756775Ab1D3NB0 (ORCPT ); Sat, 30 Apr 2011 09:01:26 -0400 From: Daniel Drake To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: linux-kernel@vger.kernel.org, dilinger@queued.net, Daniel Drake Subject: [PATCH 07/11] x86, olpc-xo1-sci: Add GPE handler and ebook switch functionality Date: Sat, 30 Apr 2011 13:32:26 +0100 Message-Id: <1304166750-31125-8-git-send-email-dsd@laptop.org> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1304166750-31125-1-git-send-email-dsd@laptop.org> References: <1304166750-31125-1-git-send-email-dsd@laptop.org> X-Cloudmark-Analysis: v=1.1 cv=R50lirqlHffDPPkwUlkuVa99MrvKdVWo//yz83qex8g= c=1 sm=0 a=lP9hPYfWmvkA:10 a=vJ1w_8FsMGIA:10 a=Op-mwl0xAAAA:8 a=8pUI9j0R9x75pM3QE4EA:9 a=5Pw5yg4cXYNAtHwa-0wA:7 a=d4CUUju0HPYA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8665 Lines: 330 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 --- arch/x86/Kconfig | 2 + arch/x86/include/asm/olpc.h | 5 +- arch/x86/platform/olpc/olpc-xo1-sci.c | 170 ++++++++++++++++++++++++++++++++- include/linux/cs5535.h | 8 ++ 4 files changed, 182 insertions(+), 3 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c273c62..0e62cd5 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2077,7 +2077,9 @@ config OLPC_XO1_SCI depends on OLPC && OLPC_XO1_PM ---help--- Add support for SCI-based features of the OLPC XO-1 laptop: + - EC-driven system wakeups - Power button + - Ebook switch endif # X86_32 diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h index 0e56d01..87bdbca 100644 --- a/arch/x86/include/asm/olpc.h +++ b/arch/x86/include/asm/olpc.h @@ -111,6 +111,7 @@ extern int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen, #define EC_WRITE_SCI_MASK 0x1b #define EC_WAKE_UP_WLAN 0x24 #define EC_WLAN_LEAVE_RESET 0x25 +#define EC_READ_EB_MODE 0x2a #define EC_SET_SCI_INHIBIT 0x32 #define EC_SET_SCI_INHIBIT_RELEASE 0x34 #define EC_WLAN_ENTER_RESET 0x35 @@ -144,7 +145,7 @@ extern int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen, #define OLPC_GPIO_SMB_CLK 14 #define OLPC_GPIO_SMB_DATA 15 #define OLPC_GPIO_WORKAUX geode_gpio(24) -#define OLPC_GPIO_LID geode_gpio(26) -#define OLPC_GPIO_ECSCI geode_gpio(27) +#define OLPC_GPIO_LID 26 +#define OLPC_GPIO_ECSCI 27 #endif /* _ASM_X86_OLPC_H */ diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c index 8fbf961..9de2a00 100644 --- a/arch/x86/platform/olpc/olpc-xo1-sci.c +++ b/arch/x86/platform/olpc/olpc-xo1-sci.c @@ -12,12 +12,15 @@ */ #include +#include +#include #include #include #include #include #include #include +#include #include #include @@ -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 +177,37 @@ 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 */ + 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_gpio_set_irq(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 +239,37 @@ 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 +294,39 @@ 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 +334,9 @@ 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 +349,7 @@ 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) diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h index 6f78235..95c16ac 100644 --- a/include/linux/cs5535.h +++ b/include/linux/cs5535.h @@ -73,6 +73,7 @@ #define CS5536_PM1_EN 0x02 #define CS5536_PM1_CNT 0x08 #define CS5536_PM_GPE0_STS 0x18 +#define CS5536_PM_GPE0_EN 0x1c /* CS5536_PM1_STS bits */ #define CS5536_WAK_FLAG (1 << 15) @@ -81,6 +82,13 @@ /* CS5536_PM1_EN bits */ #define CS5536_PM_PWRBTN (1 << 8) +/* CS5536_PM_GPE0_STS bits */ +#define CS5536_GPIOM7_PME_FLAG (1 << 31) +#define CS5536_GPIOM6_PME_FLAG (1 << 30) + +/* CS5536_PM_GPE0_EN bits */ +#define CS5536_GPIOM7_PME_EN (1 << 31) + /* VSA2 magic values */ #define VSA_VRC_INDEX 0xAC1C #define VSA_VRC_DATA 0xAC1E -- 1.7.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/