From d0f7a6d6d193c22793b128728666726fbd3667eb Mon Sep 17 00:00:00 2001 From: Haojian Zhuang Date: Fri, 18 Jun 2010 19:59:53 +0200 Subject: mfd: Enable onkey on max8925 Enable onkey feature in max8925 driver. Signed-off-by: Haojian Zhuang Signed-off-by: Samuel Ortiz --- drivers/mfd/max8925-core.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/mfd/max8925-core.c b/drivers/mfd/max8925-core.c index f621bcea3d0..04028a9ee08 100644 --- a/drivers/mfd/max8925-core.c +++ b/drivers/mfd/max8925-core.c @@ -90,6 +90,24 @@ static struct mfd_cell rtc_devs[] = { }, }; +static struct resource onkey_resources[] = { + { + .name = "max8925-onkey", + .start = MAX8925_IRQ_GPM_SW_3SEC, + .end = MAX8925_IRQ_GPM_SW_3SEC, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct mfd_cell onkey_devs[] = { + { + .name = "max8925-onkey", + .num_resources = 1, + .resources = &onkey_resources[0], + .id = -1, + }, +}; + #define MAX8925_REG_RESOURCE(_start, _end) \ { \ .start = MAX8925_##_start, \ @@ -596,6 +614,15 @@ int __devinit max8925_device_init(struct max8925_chip *chip, dev_err(chip->dev, "Failed to add rtc subdev\n"); goto out; } + + ret = mfd_add_devices(chip->dev, 0, &onkey_devs[0], + ARRAY_SIZE(onkey_devs), + &onkey_resources[0], 0); + if (ret < 0) { + dev_err(chip->dev, "Failed to add onkey subdev\n"); + goto out_dev; + } + if (pdata && pdata->regulator[0]) { ret = mfd_add_devices(chip->dev, 0, ®ulator_devs[0], ARRAY_SIZE(regulator_devs), -- cgit v1.2.3-18-g5258 From 21f1fc38606b35bb12a4772367ef68128cd12c30 Mon Sep 17 00:00:00 2001 From: Haojian Zhuang Date: Wed, 19 May 2010 13:06:59 +0800 Subject: mfd: Fix led resource in 88pm860x Fix typo error in LED resource of 88pm860x. Signed-off-by: Haojian Zhuang Signed-off-by: Samuel Ortiz --- drivers/mfd/88pm860x-core.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/mfd/88pm860x-core.c b/drivers/mfd/88pm860x-core.c index 2c65a2c5729..1580f1f2ec6 100644 --- a/drivers/mfd/88pm860x-core.c +++ b/drivers/mfd/88pm860x-core.c @@ -74,12 +74,12 @@ static struct mfd_cell backlight_devs[] = { } static struct resource led_resources[] = { - PM8606_LED_RESOURCE(PM8606_LED1_RED, RGB2B), - PM8606_LED_RESOURCE(PM8606_LED1_GREEN, RGB2C), - PM8606_LED_RESOURCE(PM8606_LED1_BLUE, RGB2D), - PM8606_LED_RESOURCE(PM8606_LED2_RED, RGB1B), - PM8606_LED_RESOURCE(PM8606_LED2_GREEN, RGB1C), - PM8606_LED_RESOURCE(PM8606_LED2_BLUE, RGB1D), + PM8606_LED_RESOURCE(PM8606_LED1_RED, RGB1B), + PM8606_LED_RESOURCE(PM8606_LED1_GREEN, RGB1C), + PM8606_LED_RESOURCE(PM8606_LED1_BLUE, RGB1D), + PM8606_LED_RESOURCE(PM8606_LED2_RED, RGB2B), + PM8606_LED_RESOURCE(PM8606_LED2_GREEN, RGB2C), + PM8606_LED_RESOURCE(PM8606_LED2_BLUE, RGB2D), }; #define PM8606_LED_DEVS(_i) \ -- cgit v1.2.3-18-g5258 From d281b80c46da8bae806c4ef5682187f07e35389d Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Tue, 25 May 2010 14:49:51 +0800 Subject: mfd: Fix memory leak in ab3100_otp_probe In current implementation, there is a memory leak if ab3100_otp_read fail. And in the case of ab3100_otp_init_debugfs fail, it does not properly remove sysfs entries. This patch properly handle above failure cases. Signed-off-by: Axel Lin Acked-by: Linus Walleij Signed-off-by: Samuel Ortiz --- drivers/mfd/ab3100-otp.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/mfd/ab3100-otp.c b/drivers/mfd/ab3100-otp.c index 63d2b727ddb..8440010eb2b 100644 --- a/drivers/mfd/ab3100-otp.c +++ b/drivers/mfd/ab3100-otp.c @@ -199,7 +199,7 @@ static int __init ab3100_otp_probe(struct platform_device *pdev) err = ab3100_otp_read(otp); if (err) - return err; + goto err_otp_read; dev_info(&pdev->dev, "AB3100 OTP readout registered\n"); @@ -208,21 +208,21 @@ static int __init ab3100_otp_probe(struct platform_device *pdev) err = device_create_file(&pdev->dev, &ab3100_otp_attrs[i]); if (err) - goto out_no_sysfs; + goto err_create_file; } /* debugfs entries */ err = ab3100_otp_init_debugfs(&pdev->dev, otp); if (err) - goto out_no_debugfs; + goto err_init_debugfs; return 0; -out_no_sysfs: - for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) - device_remove_file(&pdev->dev, - &ab3100_otp_attrs[i]); -out_no_debugfs: +err_init_debugfs: +err_create_file: + while (--i >= 0) + device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]); +err_otp_read: kfree(otp); return err; } -- cgit v1.2.3-18-g5258 From eb6e8ddf06ff0d6b6548ca0b95a4edfeb2aaadd0 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 27 May 2010 00:54:09 +0200 Subject: mfd: Fix 88pm860x uninitialized variable and clean up MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The original code had a compile warning: drivers/mfd/88pm860x-core.c:431: warning: ‘ret’ may be used uninitialized in this function It seems like the warning is valid if either pdata or pdata->touch is NULL. This patch checks pdata and pdata->touch at the beginning of the function. That means everything can be pulled in one indent level. Now all the statements fit within the 80 character limit. Also at that point the "use_gpadc" variable isn't needed and removing it simplifies the logic. Signed-off-by: Dan Carpenter Acked-by: Haojian Zhuang Signed-off-by: Samuel Ortiz --- drivers/mfd/88pm860x-core.c | 72 ++++++++++++++++++++------------------------- 1 file changed, 32 insertions(+), 40 deletions(-) diff --git a/drivers/mfd/88pm860x-core.c b/drivers/mfd/88pm860x-core.c index 1580f1f2ec6..07933f3f7e4 100644 --- a/drivers/mfd/88pm860x-core.c +++ b/drivers/mfd/88pm860x-core.c @@ -428,52 +428,44 @@ static int __devinit device_gpadc_init(struct pm860x_chip *chip, { struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ : chip->companion; - int use_gpadc = 0, data, ret; + int data; + int ret; /* initialize GPADC without activating it */ - if (pdata && pdata->touch) { - /* set GPADC MISC1 register */ - data = 0; - data |= (pdata->touch->gpadc_prebias << 1) - & PM8607_GPADC_PREBIAS_MASK; - data |= (pdata->touch->slot_cycle << 3) - & PM8607_GPADC_SLOT_CYCLE_MASK; - data |= (pdata->touch->off_scale << 5) - & PM8607_GPADC_OFF_SCALE_MASK; - data |= (pdata->touch->sw_cal << 7) - & PM8607_GPADC_SW_CAL_MASK; - if (data) { - ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); - if (ret < 0) - goto out; - } - /* set tsi prebias time */ - if (pdata->touch->tsi_prebias) { - data = pdata->touch->tsi_prebias; - ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); - if (ret < 0) - goto out; - } - /* set prebias & prechg time of pen detect */ - data = 0; - data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK; - data |= (pdata->touch->pen_prechg << 5) - & PM8607_PD_PRECHG_MASK; - if (data) { - ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); - if (ret < 0) - goto out; - } + if (!pdata || !pdata->touch) + return -EINVAL; - use_gpadc = 1; + /* set GPADC MISC1 register */ + data = 0; + data |= (pdata->touch->gpadc_prebias << 1) & PM8607_GPADC_PREBIAS_MASK; + data |= (pdata->touch->slot_cycle << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; + data |= (pdata->touch->off_scale << 5) & PM8607_GPADC_OFF_SCALE_MASK; + data |= (pdata->touch->sw_cal << 7) & PM8607_GPADC_SW_CAL_MASK; + if (data) { + ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); + if (ret < 0) + goto out; } - - /* turn on GPADC */ - if (use_gpadc) { - ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, - PM8607_GPADC_EN, PM8607_GPADC_EN); + /* set tsi prebias time */ + if (pdata->touch->tsi_prebias) { + data = pdata->touch->tsi_prebias; + ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); + if (ret < 0) + goto out; } + /* set prebias & prechg time of pen detect */ + data = 0; + data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK; + data |= (pdata->touch->pen_prechg << 5) & PM8607_PD_PRECHG_MASK; + if (data) { + ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); + if (ret < 0) + goto out; + } + + ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, + PM8607_GPADC_EN, PM8607_GPADC_EN); out: return ret; } -- cgit v1.2.3-18-g5258 From c0d4010e11e23d6f55f9bdda63b1974f35af71bf Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Fri, 28 May 2010 02:59:44 +0200 Subject: mfd: AB8500 mask off irrelevant bits from the SPI message The registers on the AB8500 are only 8 bits wide, so the content of the remaining bits is undefined. Let's mask off the undefined stuff when returning a register in an SPI read. Acked-by: Rabin Vincent Signed-off-by: Linus Walleij Signed-off-by: Samuel Ortiz --- drivers/mfd/ab8500-spi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/ab8500-spi.c b/drivers/mfd/ab8500-spi.c index b81d4f768ef..e1c8b62b086 100644 --- a/drivers/mfd/ab8500-spi.c +++ b/drivers/mfd/ab8500-spi.c @@ -68,7 +68,12 @@ static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr) ret = spi_sync(spi, &msg); if (!ret) - ret = ab8500->rx_buf[0]; + /* + * Only the 8 lowermost bytes are + * defined with value, the rest may + * vary depending on chip/board noise. + */ + ret = ab8500->rx_buf[0] & 0xFFU; return ret; } -- cgit v1.2.3-18-g5258 From 25fe24f884015ba2e1e39376deb055bbbdc5ba83 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 28 May 2010 22:58:46 +0200 Subject: mfd: kzalloc doesn't return ERR_PTR Use !x rather than IS_ERR(x) to test the result of kzalloc. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ expression x,E; @@ x = \(kmalloc\|kzalloc\|kcalloc\)(...) ... when != x = E - IS_ERR(x) + !x // Signed-off-by: Julia Lawall Signed-off-by: Samuel Ortiz --- drivers/mfd/abx500-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mfd/abx500-core.c b/drivers/mfd/abx500-core.c index 3b3b97ec32a..f12720dbe12 100644 --- a/drivers/mfd/abx500-core.c +++ b/drivers/mfd/abx500-core.c @@ -36,7 +36,7 @@ int abx500_register_ops(struct device *dev, struct abx500_ops *ops) struct abx500_device_entry *dev_entry; dev_entry = kzalloc(sizeof(struct abx500_device_entry), GFP_KERNEL); - if (IS_ERR(dev_entry)) { + if (!dev_entry) { dev_err(dev, "register_ops kzalloc failed"); return -ENOMEM; } -- cgit v1.2.3-18-g5258 From 8af5fe3bc59d73479ff701340e1a9bc7c6b5f0ff Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Mon, 31 May 2010 17:30:55 +0800 Subject: mfd: properly handle platform_device_add_resources fail in mfd_add_device platform_device_add_resources may fail, thus add error checking for it. Signed-off-by: Axel Lin Signed-off-by: Samuel Ortiz --- drivers/mfd/mfd-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 7dd76bceaae..1823a57b7d8 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -70,7 +70,9 @@ static int mfd_add_device(struct device *parent, int id, goto fail_res; } - platform_device_add_resources(pdev, res, cell->num_resources); + ret = platform_device_add_resources(pdev, res, cell->num_resources); + if (ret) + goto fail_res; ret = platform_device_add(pdev); if (ret) -- cgit v1.2.3-18-g5258 From e2bde787131a01d0f2ca9baccaf3d107bf6c0c92 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Tue, 1 Jun 2010 16:34:38 +0200 Subject: mfd: Fix davinci memory leak Error handling code following a kmalloc should free the allocated data. The semantic match that finds the problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } ( x->f1 = E | (x->f1 == NULL || ...) | f(...,x->f1,...) ) ...> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // Signed-off-by: Julia Lawall Signed-off-by: Samuel Ortiz --- drivers/mfd/davinci_voicecodec.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/mfd/davinci_voicecodec.c b/drivers/mfd/davinci_voicecodec.c index 3e75f02e477..33c923d215c 100644 --- a/drivers/mfd/davinci_voicecodec.c +++ b/drivers/mfd/davinci_voicecodec.c @@ -94,7 +94,8 @@ static int __init davinci_vc_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!res) { dev_err(&pdev->dev, "no DMA resource\n"); - return -ENXIO; + ret = -ENXIO; + goto fail4; } davinci_vc->davinci_vcif.dma_tx_channel = res->start; @@ -104,7 +105,8 @@ static int __init davinci_vc_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!res) { dev_err(&pdev->dev, "no DMA resource\n"); - return -ENXIO; + ret = -ENXIO; + goto fail4; } davinci_vc->davinci_vcif.dma_rx_channel = res->start; -- cgit v1.2.3-18-g5258 From 3cb46ac058f8ce3ed339fc5dcf6faae4329153c9 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 9 Jun 2010 14:54:54 +0100 Subject: mfd: Staticise ab3550 register access functions These are now exported via an ops table rather than referenced directly and so should be staticised. Signed-off-by: Mark Brown Acked-by: Linus Walleij Signed-off-by: Samuel Ortiz --- drivers/mfd/ab3550-core.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/mfd/ab3550-core.c b/drivers/mfd/ab3550-core.c index f54ab62e7bc..8a98739e6d9 100644 --- a/drivers/mfd/ab3550-core.c +++ b/drivers/mfd/ab3550-core.c @@ -589,16 +589,16 @@ static bool reg_read_allowed(const struct ab3550_reg_ranges *ranges, u8 reg) } /* - * The exported register access functionality. + * The register access functionality. */ -int ab3550_get_chip_id(struct device *dev) +static int ab3550_get_chip_id(struct device *dev) { struct ab3550 *ab = dev_get_drvdata(dev->parent); return (int)ab->chip_id; } -int ab3550_mask_and_set_register_interruptible(struct device *dev, u8 bank, - u8 reg, u8 bitmask, u8 bitvalues) +static int ab3550_mask_and_set_register_interruptible(struct device *dev, + u8 bank, u8 reg, u8 bitmask, u8 bitvalues) { struct ab3550 *ab; struct platform_device *pdev = to_platform_device(dev); @@ -612,15 +612,15 @@ int ab3550_mask_and_set_register_interruptible(struct device *dev, u8 bank, bitmask, bitvalues); } -int ab3550_set_register_interruptible(struct device *dev, u8 bank, u8 reg, - u8 value) +static int ab3550_set_register_interruptible(struct device *dev, u8 bank, + u8 reg, u8 value) { return ab3550_mask_and_set_register_interruptible(dev, bank, reg, 0xFF, value); } -int ab3550_get_register_interruptible(struct device *dev, u8 bank, u8 reg, - u8 *value) +static int ab3550_get_register_interruptible(struct device *dev, u8 bank, + u8 reg, u8 *value) { struct ab3550 *ab; struct platform_device *pdev = to_platform_device(dev); @@ -633,7 +633,7 @@ int ab3550_get_register_interruptible(struct device *dev, u8 bank, u8 reg, return get_register_interruptible(ab, bank, reg, value); } -int ab3550_get_register_page_interruptible(struct device *dev, u8 bank, +static int ab3550_get_register_page_interruptible(struct device *dev, u8 bank, u8 first_reg, u8 *regvals, u8 numregs) { struct ab3550 *ab; @@ -649,7 +649,8 @@ int ab3550_get_register_page_interruptible(struct device *dev, u8 bank, numregs); } -int ab3550_event_registers_startup_state_get(struct device *dev, u8 *event) +static int ab3550_event_registers_startup_state_get(struct device *dev, + u8 *event) { struct ab3550 *ab; @@ -661,7 +662,7 @@ int ab3550_event_registers_startup_state_get(struct device *dev, u8 *event) return 0; } -int ab3550_startup_irq_enabled(struct device *dev, unsigned int irq) +static int ab3550_startup_irq_enabled(struct device *dev, unsigned int irq) { struct ab3550 *ab; struct ab3550_platform_data *plf_data; -- cgit v1.2.3-18-g5258 From 15742c8a42c89aa5e63542b0de00b0dc4c5038cf Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Sat, 19 Jun 2010 02:29:24 +0200 Subject: mfd: More verbose MFD Kconfig entry For people to be able to intellingibly decide if they want to enable MFD drivers or not, we have to give them a much better description of what they are. --- drivers/mfd/Kconfig | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 9da0e504bbe..29781ca1eb6 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -7,7 +7,16 @@ menuconfig MFD_SUPPORT depends on HAS_IOMEM default y help - Configure MFD device drivers. + Multifunction devices embed several functions (e.g. GPIOs, + touchscreens, keyboards, current regulators, power management chips, + etc...) in one single integrated circuit. They usually talk to the + main CPU through one or more IRQ lines and low speed data busses (SPI, + I2C, etc..). They appear as one single device to the main system + through the data bus and the MFD framework allows for sub devices + (a.k.a. functions) to appear as discrete platform devices. + MFDs are typically found on embedded platforms. + + This option alone does not add any kernel code. if MFD_SUPPORT -- cgit v1.2.3-18-g5258 From d2d272a965baeb3d78f843374bc48f0cbce8ac3d Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Thu, 1 Jul 2010 17:43:50 +0800 Subject: mfd: Properly free t7l66xb clk32k clock source This patch includes below fixes to properly free clk32k clock source: 1. remove a redundant clk_put in t7l66xb_probe error path 2. add missing clk_disable(t7l66xb->clk32k) and clk_put(t7l66xb->clk32k) to properly free the clock source. Signed-off-by: Axel Lin Signed-off-by: Samuel Ortiz --- drivers/mfd/t7l66xb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c index 5041d33adf0..006c121f3f0 100644 --- a/drivers/mfd/t7l66xb.c +++ b/drivers/mfd/t7l66xb.c @@ -350,7 +350,6 @@ static int t7l66xb_probe(struct platform_device *dev) t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M"); if (IS_ERR(t7l66xb->clk48m)) { ret = PTR_ERR(t7l66xb->clk48m); - clk_put(t7l66xb->clk32k); goto err_clk48m_get; } @@ -425,6 +424,8 @@ static int t7l66xb_remove(struct platform_device *dev) ret = pdata->disable(dev); clk_disable(t7l66xb->clk48m); clk_put(t7l66xb->clk48m); + clk_disable(t7l66xb->clk32k); + clk_put(t7l66xb->clk32k); t7l66xb_detach_irq(dev); iounmap(t7l66xb->scr); release_resource(&t7l66xb->rscr); -- cgit v1.2.3-18-g5258 From 27e34995e1a863c1e9beba30e51dfe2a083f918d Mon Sep 17 00:00:00 2001 From: Rabin Vincent Date: Fri, 2 Jul 2010 16:52:08 +0530 Subject: mfd: Add STMPE I/O Expander support Add support for the STMPE family of I/O Expanders from STMicroelectronics. These devices include upto 24 gpios and a varying selection of blocks, including PWM, keypad, and touchscreen controllers. This patch adds the MFD core. [l.fu@pengutronix.de: fix stmpe811 enable hook] [l.fu@pengutronix.de: add touchscreen platform data] Acked-by: Luotao Fu Acked-by: Linus Walleij Signed-off-by: Rabin Vincent Signed-off-by: Samuel Ortiz --- drivers/mfd/Kconfig | 23 ++ drivers/mfd/Makefile | 1 + drivers/mfd/stmpe.c | 915 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/mfd/stmpe.h | 176 +++++++++ include/linux/mfd/stmpe.h | 197 ++++++++++ 5 files changed, 1312 insertions(+) create mode 100644 drivers/mfd/stmpe.c create mode 100644 drivers/mfd/stmpe.h create mode 100644 include/linux/mfd/stmpe.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 29781ca1eb6..8f5145b4b56 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -186,6 +186,29 @@ config TWL4030_CODEC select MFD_CORE default n +config MFD_STMPE + bool "Support STMicroelectronics STMPE" + depends on I2C=y && GENERIC_HARDIRQS + select MFD_CORE + help + Support for the STMPE family of I/O Expanders from + STMicroelectronics. + + Currently supported devices are: + + STMPE811: GPIO, Touchscreen + STMPE1601: GPIO, Keypad + STMPE2401: GPIO, Keypad + STMPE2403: GPIO, Keypad + + This driver provides common support for accessing the device, + additional drivers must be enabled in order to use the functionality + of the device. Currently available sub drivers are: + + GPIO: stmpe-gpio + Keypad: stmpe-keypad + Touchscreen: stmpe-ts + config MFD_TC35892 bool "Support Toshiba TC35892" depends on I2C=y && GENERIC_HARDIRQS diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index fb503e77dc6..4410747f7b5 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o obj-$(CONFIG_MFD_DAVINCI_VOICECODEC) += davinci_voicecodec.o obj-$(CONFIG_MFD_DM355EVM_MSP) += dm355evm_msp.o +obj-$(CONFIG_MFD_STMPE) += stmpe.o obj-$(CONFIG_MFD_TC35892) += tc35892.o obj-$(CONFIG_MFD_T7L66XB) += t7l66xb.o tmio_core.o obj-$(CONFIG_MFD_TC6387XB) += tc6387xb.o tmio_core.o diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c new file mode 100644 index 00000000000..a7f3099fdcf --- /dev/null +++ b/drivers/mfd/stmpe.c @@ -0,0 +1,915 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License, version 2 + * Author: Rabin Vincent for ST-Ericsson + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "stmpe.h" + +static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks) +{ + return stmpe->variant->enable(stmpe, blocks, true); +} + +static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks) +{ + return stmpe->variant->enable(stmpe, blocks, false); +} + +static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg) +{ + int ret; + + ret = i2c_smbus_read_byte_data(stmpe->i2c, reg); + if (ret < 0) + dev_err(stmpe->dev, "failed to read reg %#x: %d\n", + reg, ret); + + dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret); + + return ret; +} + +static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) +{ + int ret; + + dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val); + + ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val); + if (ret < 0) + dev_err(stmpe->dev, "failed to write reg %#x: %d\n", + reg, ret); + + return ret; +} + +static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) +{ + int ret; + + ret = __stmpe_reg_read(stmpe, reg); + if (ret < 0) + return ret; + + ret &= ~mask; + ret |= val; + + return __stmpe_reg_write(stmpe, reg, ret); +} + +static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, + u8 *values) +{ + int ret; + + ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values); + if (ret < 0) + dev_err(stmpe->dev, "failed to read regs %#x: %d\n", + reg, ret); + + dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret); + stmpe_dump_bytes("stmpe rd: ", values, length); + + return ret; +} + +static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, + const u8 *values) +{ + int ret; + + dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length); + stmpe_dump_bytes("stmpe wr: ", values, length); + + ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length, + values); + if (ret < 0) + dev_err(stmpe->dev, "failed to write regs %#x: %d\n", + reg, ret); + + return ret; +} + +/** + * stmpe_enable - enable blocks on an STMPE device + * @stmpe: Device to work on + * @blocks: Mask of blocks (enum stmpe_block values) to enable + */ +int stmpe_enable(struct stmpe *stmpe, unsigned int blocks) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_enable(stmpe, blocks); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_enable); + +/** + * stmpe_disable - disable blocks on an STMPE device + * @stmpe: Device to work on + * @blocks: Mask of blocks (enum stmpe_block values) to enable + */ +int stmpe_disable(struct stmpe *stmpe, unsigned int blocks) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_disable(stmpe, blocks); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_disable); + +/** + * stmpe_reg_read() - read a single STMPE register + * @stmpe: Device to read from + * @reg: Register to read + */ +int stmpe_reg_read(struct stmpe *stmpe, u8 reg) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_reg_read(stmpe, reg); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_reg_read); + +/** + * stmpe_reg_write() - write a single STMPE register + * @stmpe: Device to write to + * @reg: Register to write + * @val: Value to write + */ +int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_reg_write(stmpe, reg, val); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_reg_write); + +/** + * stmpe_set_bits() - set the value of a bitfield in a STMPE register + * @stmpe: Device to write to + * @reg: Register to write + * @mask: Mask of bits to set + * @val: Value to set + */ +int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_set_bits(stmpe, reg, mask, val); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_set_bits); + +/** + * stmpe_block_read() - read multiple STMPE registers + * @stmpe: Device to read from + * @reg: First register + * @length: Number of registers + * @values: Buffer to write to + */ +int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_block_read(stmpe, reg, length, values); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_block_read); + +/** + * stmpe_block_write() - write multiple STMPE registers + * @stmpe: Device to write to + * @reg: First register + * @length: Number of registers + * @values: Values to write + */ +int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, + const u8 *values) +{ + int ret; + + mutex_lock(&stmpe->lock); + ret = __stmpe_block_write(stmpe, reg, length, values); + mutex_unlock(&stmpe->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_block_write); + +/** + * stmpe_set_altfunc: set the alternate function for STMPE pins + * @stmpe: Device to configure + * @pins: Bitmask of pins to affect + * @block: block to enable alternate functions for + * + * @pins is assumed to have a bit set for each of the bits whose alternate + * function is to be changed, numbered according to the GPIOXY numbers. + * + * If the GPIO module is not enabled, this function automatically enables it in + * order to perform the change. + */ +int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block) +{ + struct stmpe_variant_info *variant = stmpe->variant; + u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB]; + int af_bits = variant->af_bits; + int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8); + int afperreg = 8 / af_bits; + int mask = (1 << af_bits) - 1; + u8 regs[numregs]; + int af; + int ret; + + mutex_lock(&stmpe->lock); + + ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO); + if (ret < 0) + goto out; + + ret = __stmpe_block_read(stmpe, regaddr, numregs, regs); + if (ret < 0) + goto out; + + af = variant->get_altfunc(stmpe, block); + + while (pins) { + int pin = __ffs(pins); + int regoffset = numregs - (pin / afperreg) - 1; + int pos = (pin % afperreg) * (8 / afperreg); + + regs[regoffset] &= ~(mask << pos); + regs[regoffset] |= af << pos; + + pins &= ~(1 << pin); + } + + ret = __stmpe_block_write(stmpe, regaddr, numregs, regs); + +out: + mutex_unlock(&stmpe->lock); + return ret; +} +EXPORT_SYMBOL_GPL(stmpe_set_altfunc); + +/* + * GPIO (all variants) + */ + +static struct resource stmpe_gpio_resources[] = { + /* Start and end filled dynamically */ + { + .flags = IORESOURCE_IRQ, + }, +}; + +static struct mfd_cell stmpe_gpio_cell = { + .name = "stmpe-gpio", + .resources = stmpe_gpio_resources, + .num_resources = ARRAY_SIZE(stmpe_gpio_resources), +}; + +/* + * Keypad (1601, 2401, 2403) + */ + +static struct resource stmpe_keypad_resources[] = { + { + .name = "KEYPAD", + .start = 0, + .end = 0, + .flags = IORESOURCE_IRQ, + }, + { + .name = "KEYPAD_OVER", + .start = 1, + .end = 1, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct mfd_cell stmpe_keypad_cell = { + .name = "stmpe-keypad", + .resources = stmpe_keypad_resources, + .num_resources = ARRAY_SIZE(stmpe_keypad_resources), +}; + +/* + * Touchscreen (STMPE811) + */ + +static struct resource stmpe_ts_resources[] = { + { + .name = "TOUCH_DET", + .start = 0, + .end = 0, + .flags = IORESOURCE_IRQ, + }, + { + .name = "FIFO_TH", + .start = 1, + .end = 1, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct mfd_cell stmpe_ts_cell = { + .name = "stmpe-ts", + .resources = stmpe_ts_resources, + .num_resources = ARRAY_SIZE(stmpe_ts_resources), +}; + +/* + * STMPE811 + */ + +static const u8 stmpe811_regs[] = { + [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID, + [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL, + [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN, + [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA, + [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA, + [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN, + [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN, + [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR, + [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE, + [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE, + [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF, + [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN, + [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA, + [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED, +}; + +static struct stmpe_variant_block stmpe811_blocks[] = { + { + .cell = &stmpe_gpio_cell, + .irq = STMPE811_IRQ_GPIOC, + .block = STMPE_BLOCK_GPIO, + }, + { + .cell = &stmpe_ts_cell, + .irq = STMPE811_IRQ_TOUCH_DET, + .block = STMPE_BLOCK_TOUCHSCREEN, + }, +}; + +static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks, + bool enable) +{ + unsigned int mask = 0; + + if (blocks & STMPE_BLOCK_GPIO) + mask |= STMPE811_SYS_CTRL2_GPIO_OFF; + + if (blocks & STMPE_BLOCK_ADC) + mask |= STMPE811_SYS_CTRL2_ADC_OFF; + + if (blocks & STMPE_BLOCK_TOUCHSCREEN) + mask |= STMPE811_SYS_CTRL2_TSC_OFF; + + return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask, + enable ? 0 : mask); +} + +static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) +{ + /* 0 for touchscreen, 1 for GPIO */ + return block != STMPE_BLOCK_TOUCHSCREEN; +} + +static struct stmpe_variant_info stmpe811 = { + .name = "stmpe811", + .id_val = 0x0811, + .id_mask = 0xffff, + .num_gpios = 8, + .af_bits = 1, + .regs = stmpe811_regs, + .blocks = stmpe811_blocks, + .num_blocks = ARRAY_SIZE(stmpe811_blocks), + .num_irqs = STMPE811_NR_INTERNAL_IRQS, + .enable = stmpe811_enable, + .get_altfunc = stmpe811_get_altfunc, +}; + +/* + * STMPE1601 + */ + +static const u8 stmpe1601_regs[] = { + [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID, + [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB, + [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB, + [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB, + [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB, + [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB, + [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB, + [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB, + [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB, + [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB, + [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB, + [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB, + [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB, + [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB, +}; + +static struct stmpe_variant_block stmpe1601_blocks[] = { + { + .cell = &stmpe_gpio_cell, + .irq = STMPE24XX_IRQ_GPIOC, + .block = STMPE_BLOCK_GPIO, + }, + { + .cell = &stmpe_keypad_cell, + .irq = STMPE24XX_IRQ_KEYPAD, + .block = STMPE_BLOCK_KEYPAD, + }, +}; + +static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, + bool enable) +{ + unsigned int mask = 0; + + if (blocks & STMPE_BLOCK_GPIO) + mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO; + + if (blocks & STMPE_BLOCK_KEYPAD) + mask |= STMPE1601_SYS_CTRL_ENABLE_KPC; + + return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask, + enable ? mask : 0); +} + +static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) +{ + switch (block) { + case STMPE_BLOCK_PWM: + return 2; + + case STMPE_BLOCK_KEYPAD: + return 1; + + case STMPE_BLOCK_GPIO: + default: + return 0; + } +} + +static struct stmpe_variant_info stmpe1601 = { + .name = "stmpe1601", + .id_val = 0x0210, + .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */ + .num_gpios = 16, + .af_bits = 2, + .regs = stmpe1601_regs, + .blocks = stmpe1601_blocks, + .num_blocks = ARRAY_SIZE(stmpe1601_blocks), + .num_irqs = STMPE1601_NR_INTERNAL_IRQS, + .enable = stmpe1601_enable, + .get_altfunc = stmpe1601_get_altfunc, +}; + +/* + * STMPE24XX + */ + +static const u8 stmpe24xx_regs[] = { + [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID, + [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB, + [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB, + [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB, + [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB, + [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB, + [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB, + [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB, + [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB, + [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB, + [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB, + [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB, + [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB, + [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB, +}; + +static struct stmpe_variant_block stmpe24xx_blocks[] = { + { + .cell = &stmpe_gpio_cell, + .irq = STMPE24XX_IRQ_GPIOC, + .block = STMPE_BLOCK_GPIO, + }, + { + .cell = &stmpe_keypad_cell, + .irq = STMPE24XX_IRQ_KEYPAD, + .block = STMPE_BLOCK_KEYPAD, + }, +}; + +static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks, + bool enable) +{ + unsigned int mask = 0; + + if (blocks & STMPE_BLOCK_GPIO) + mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO; + + if (blocks & STMPE_BLOCK_KEYPAD) + mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC; + + return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask, + enable ? mask : 0); +} + +static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) +{ + switch (block) { + case STMPE_BLOCK_ROTATOR: + return 2; + + case STMPE_BLOCK_KEYPAD: + return 1; + + case STMPE_BLOCK_GPIO: + default: + return 0; + } +} + +static struct stmpe_variant_info stmpe2401 = { + .name = "stmpe2401", + .id_val = 0x0101, + .id_mask = 0xffff, + .num_gpios = 24, + .af_bits = 2, + .regs = stmpe24xx_regs, + .blocks = stmpe24xx_blocks, + .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), + .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, + .enable = stmpe24xx_enable, + .get_altfunc = stmpe24xx_get_altfunc, +}; + +static struct stmpe_variant_info stmpe2403 = { + .name = "stmpe2403", + .id_val = 0x0120, + .id_mask = 0xffff, + .num_gpios = 24, + .af_bits = 2, + .regs = stmpe24xx_regs, + .blocks = stmpe24xx_blocks, + .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), + .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, + .enable = stmpe24xx_enable, + .get_altfunc = stmpe24xx_get_altfunc, +}; + +static struct stmpe_variant_info *stmpe_variant_info[] = { + [STMPE811] = &stmpe811, + [STMPE1601] = &stmpe1601, + [STMPE2401] = &stmpe2401, + [STMPE2403] = &stmpe2403, +}; + +static irqreturn_t stmpe_irq(int irq, void *data) +{ + struct stmpe *stmpe = data; + struct stmpe_variant_info *variant = stmpe->variant; + int num = DIV_ROUND_UP(variant->num_irqs, 8); + u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB]; + u8 isr[num]; + int ret; + int i; + + ret = stmpe_block_read(stmpe, israddr, num, isr); + if (ret < 0) + return IRQ_NONE; + + for (i = 0; i < num; i++) { + int bank = num - i - 1; + u8 status = isr[i]; + u8 clear; + + status &= stmpe->ier[bank]; + if (!status) + continue; + + clear = status; + while (status) { + int bit = __ffs(status); + int line = bank * 8 + bit; + + handle_nested_irq(stmpe->irq_base + line); + status &= ~(1 << bit); + } + + stmpe_reg_write(stmpe, israddr + i, clear); + } + + return IRQ_HANDLED; +} + +static void stmpe_irq_lock(unsigned int irq) +{ + struct stmpe *stmpe = get_irq_chip_data(irq); + + mutex_lock(&stmpe->irq_lock); +} + +static void stmpe_irq_sync_unlock(unsigned int irq) +{ + struct stmpe *stmpe = get_irq_chip_data(irq); + struct stmpe_variant_info *variant = stmpe->variant; + int num = DIV_ROUND_UP(variant->num_irqs, 8); + int i; + + for (i = 0; i < num; i++) { + u8 new = stmpe->ier[i]; + u8 old = stmpe->oldier[i]; + + if (new == old) + continue; + + stmpe->oldier[i] = new; + stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new); + } + + mutex_unlock(&stmpe->irq_lock); +} + +static void stmpe_irq_mask(unsigned int irq) +{ + struct stmpe *stmpe = get_irq_chip_data(irq); + int offset = irq - stmpe->irq_base; + int regoffset = offset / 8; + int mask = 1 << (offset % 8); + + stmpe->ier[regoffset] &= ~mask; +} + +static void stmpe_irq_unmask(unsigned int irq) +{ + struct stmpe *stmpe = get_irq_chip_data(irq); + int offset = irq - stmpe->irq_base; + int regoffset = offset / 8; + int mask = 1 << (offset % 8); + + stmpe->ier[regoffset] |= mask; +} + +static struct irq_chip stmpe_irq_chip = { + .name = "stmpe", + .bus_lock = stmpe_irq_lock, + .bus_sync_unlock = stmpe_irq_sync_unlock, + .mask = stmpe_irq_mask, + .unmask = stmpe_irq_unmask, +}; + +static int __devinit stmpe_irq_init(struct stmpe *stmpe) +{ + int num_irqs = stmpe->variant->num_irqs; + int base = stmpe->irq_base; + int irq; + + for (irq = base; irq < base + num_irqs; irq++) { + set_irq_chip_data(irq, stmpe); + set_irq_chip_and_handler(irq, &stmpe_irq_chip, + handle_edge_irq); + set_irq_nested_thread(irq, 1); +#ifdef CONFIG_ARM + set_irq_flags(irq, IRQF_VALID); +#else + set_irq_noprobe(irq); +#endif + } + + return 0; +} + +static void stmpe_irq_remove(struct stmpe *stmpe) +{ + int num_irqs = stmpe->variant->num_irqs; + int base = stmpe->irq_base; + int irq; + + for (irq = base; irq < base + num_irqs; irq++) { +#ifdef CONFIG_ARM + set_irq_flags(irq, 0); +#endif + set_irq_chip_and_handler(irq, NULL, NULL); + set_irq_chip_data(irq, NULL); + } +} + +static int __devinit stmpe_chip_init(struct stmpe *stmpe) +{ + unsigned int irq_trigger = stmpe->pdata->irq_trigger; + struct stmpe_variant_info *variant = stmpe->variant; + u8 icr = STMPE_ICR_LSB_GIM; + unsigned int id; + u8 data[2]; + int ret; + + ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID], + ARRAY_SIZE(data), data); + if (ret < 0) + return ret; + + id = (data[0] << 8) | data[1]; + if ((id & variant->id_mask) != variant->id_val) { + dev_err(stmpe->dev, "unknown chip id: %#x\n", id); + return -EINVAL; + } + + dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id); + + /* Disable all modules -- subdrivers should enable what they need. */ + ret = stmpe_disable(stmpe, ~0); + if (ret) + return ret; + + if (irq_trigger == IRQF_TRIGGER_FALLING || + irq_trigger == IRQF_TRIGGER_RISING) + icr |= STMPE_ICR_LSB_EDGE; + + if (irq_trigger == IRQF_TRIGGER_RISING || + irq_trigger == IRQF_TRIGGER_HIGH) + icr |= STMPE_ICR_LSB_HIGH; + + if (stmpe->pdata->irq_invert_polarity) + icr ^= STMPE_ICR_LSB_HIGH; + + return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); +} + +static int __devinit stmpe_add_device(struct stmpe *stmpe, + struct mfd_cell *cell, int irq) +{ + return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, + NULL, stmpe->irq_base + irq); +} + +static int __devinit stmpe_devices_init(struct stmpe *stmpe) +{ + struct stmpe_variant_info *variant = stmpe->variant; + unsigned int platform_blocks = stmpe->pdata->blocks; + int ret = -EINVAL; + int i; + + for (i = 0; i < variant->num_blocks; i++) { + struct stmpe_variant_block *block = &variant->blocks[i]; + + if (!(platform_blocks & block->block)) + continue; + + platform_blocks &= ~block->block; + ret = stmpe_add_device(stmpe, block->cell, block->irq); + if (ret) + return ret; + } + + if (platform_blocks) + dev_warn(stmpe->dev, + "platform wants blocks (%#x) not present on variant", + platform_blocks); + + return ret; +} + +static int __devinit stmpe_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct stmpe_platform_data *pdata = i2c->dev.platform_data; + struct stmpe *stmpe; + int ret; + + if (!pdata) + return -EINVAL; + + stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL); + if (!stmpe) + return -ENOMEM; + + mutex_init(&stmpe->irq_lock); + mutex_init(&stmpe->lock); + + stmpe->dev = &i2c->dev; + stmpe->i2c = i2c; + + stmpe->pdata = pdata; + stmpe->irq_base = pdata->irq_base; + + stmpe->partnum = id->driver_data; + stmpe->variant = stmpe_variant_info[stmpe->partnum]; + stmpe->regs = stmpe->variant->regs; + stmpe->num_gpios = stmpe->variant->num_gpios; + + i2c_set_clientdata(i2c, stmpe); + + ret = stmpe_chip_init(stmpe); + if (ret) + goto out_free; + + ret = stmpe_irq_init(stmpe); + if (ret) + goto out_free; + + ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq, + pdata->irq_trigger | IRQF_ONESHOT, + "stmpe", stmpe); + if (ret) { + dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret); + goto out_removeirq; + } + + ret = stmpe_devices_init(stmpe); + if (ret) { + dev_err(stmpe->dev, "failed to add children\n"); + goto out_removedevs; + } + + return 0; + +out_removedevs: + mfd_remove_devices(stmpe->dev); + free_irq(stmpe->i2c->irq, stmpe); +out_removeirq: + stmpe_irq_remove(stmpe); +out_free: + kfree(stmpe); + return ret; +} + +static int __devexit stmpe_remove(struct i2c_client *client) +{ + struct stmpe *stmpe = i2c_get_clientdata(client); + + mfd_remove_devices(stmpe->dev); + + free_irq(stmpe->i2c->irq, stmpe); + stmpe_irq_remove(stmpe); + + kfree(stmpe); + + return 0; +} + +static const struct i2c_device_id stmpe_id[] = { + { "stmpe811", STMPE811 }, + { "stmpe1601", STMPE1601 }, + { "stmpe2401", STMPE2401 }, + { "stmpe2403", STMPE2403 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, stmpe_id); + +static struct i2c_driver stmpe_driver = { + .driver.name = "stmpe", + .driver.owner = THIS_MODULE, + .probe = stmpe_probe, + .remove = __devexit_p(stmpe_remove), + .id_table = stmpe_id, +}; + +static int __init stmpe_init(void) +{ + return i2c_add_driver(&stmpe_driver); +} +subsys_initcall(stmpe_init); + +static void __exit stmpe_exit(void) +{ + i2c_del_driver(&stmpe_driver); +} +module_exit(stmpe_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("STMPE MFD core driver"); +MODULE_AUTHOR("Rabin Vincent "); diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h new file mode 100644 index 00000000000..991f0ecbeb3 --- /dev/null +++ b/drivers/mfd/stmpe.h @@ -0,0 +1,176 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License, version 2 + * Author: Rabin Vincent for ST-Ericsson + */ + +#ifndef __STMPE_H +#define __STMPE_H + +#ifdef STMPE_DUMP_BYTES +static inline void stmpe_dump_bytes(const char *str, const void *buf, + size_t len) +{ + print_hex_dump_bytes(str, DUMP_PREFIX_OFFSET, buf, len); +} +#else +static inline void stmpe_dump_bytes(const char *str, const void *buf, + size_t len) +{ +} +#endif + +/** + * struct stmpe_variant_block - information about block + * @cell: base mfd cell + * @irq: interrupt number to be added to each IORESOURCE_IRQ + * in the cell + * @block: block id; used for identification with platform data and for + * enable and altfunc callbacks + */ +struct stmpe_variant_block { + struct mfd_cell *cell; + int irq; + enum stmpe_block block; +}; + +/** + * struct stmpe_variant_info - variant-specific information + * @name: part name + * @id_val: content of CHIPID register + * @id_mask: bits valid in CHIPID register for comparison with id_val + * @num_gpios: number of GPIOS + * @af_bits: number of bits used to specify the alternate function + * @blocks: list of blocks present on this device + * @num_blocks: number of blocks present on this device + * @num_irqs: number of internal IRQs available on this device + * @enable: callback to enable the specified blocks. + * Called with the I/O lock held. + * @get_altfunc: callback to get the alternate function number for the + * specific block + */ +struct stmpe_variant_info { + const char *name; + u16 id_val; + u16 id_mask; + int num_gpios; + int af_bits; + const u8 *regs; + struct stmpe_variant_block *blocks; + int num_blocks; + int num_irqs; + int (*enable)(struct stmpe *stmpe, unsigned int blocks, bool enable); + int (*get_altfunc)(struct stmpe *stmpe, enum stmpe_block block); +}; + +#define STMPE_ICR_LSB_HIGH (1 << 2) +#define STMPE_ICR_LSB_EDGE (1 << 1) +#define STMPE_ICR_LSB_GIM (1 << 0) + +/* + * STMPE811 + */ + +#define STMPE811_IRQ_TOUCH_DET 0 +#define STMPE811_IRQ_FIFO_TH 1 +#define STMPE811_IRQ_FIFO_OFLOW 2 +#define STMPE811_IRQ_FIFO_FULL 3 +#define STMPE811_IRQ_FIFO_EMPTY 4 +#define STMPE811_IRQ_TEMP_SENS 5 +#define STMPE811_IRQ_ADC 6 +#define STMPE811_IRQ_GPIOC 7 +#define STMPE811_NR_INTERNAL_IRQS 8 + +#define STMPE811_REG_CHIP_ID 0x00 +#define STMPE811_REG_SYS_CTRL2 0x04 +#define STMPE811_REG_INT_CTRL 0x09 +#define STMPE811_REG_INT_EN 0x0A +#define STMPE811_REG_INT_STA 0x0B +#define STMPE811_REG_GPIO_INT_EN 0x0C +#define STMPE811_REG_GPIO_INT_STA 0x0D +#define STMPE811_REG_GPIO_SET_PIN 0x10 +#define STMPE811_REG_GPIO_CLR_PIN 0x11 +#define STMPE811_REG_GPIO_MP_STA 0x12 +#define STMPE811_REG_GPIO_DIR 0x13 +#define STMPE811_REG_GPIO_ED 0x14 +#define STMPE811_REG_GPIO_RE 0x15 +#define STMPE811_REG_GPIO_FE 0x16 +#define STMPE811_REG_GPIO_AF 0x17 + +#define STMPE811_SYS_CTRL2_ADC_OFF (1 << 0) +#define STMPE811_SYS_CTRL2_TSC_OFF (1 << 1) +#define STMPE811_SYS_CTRL2_GPIO_OFF (1 << 2) +#define STMPE811_SYS_CTRL2_TS_OFF (1 << 3) + +/* + * STMPE1601 + */ + +#define STMPE1601_IRQ_GPIOC 8 +#define STMPE1601_IRQ_PWM3 7 +#define STMPE1601_IRQ_PWM2 6 +#define STMPE1601_IRQ_PWM1 5 +#define STMPE1601_IRQ_PWM0 4 +#define STMPE1601_IRQ_KEYPAD_OVER 2 +#define STMPE1601_IRQ_KEYPAD 1 +#define STMPE1601_IRQ_WAKEUP 0 +#define STMPE1601_NR_INTERNAL_IRQS 9 + +#define STMPE1601_REG_SYS_CTRL 0x02 +#define STMPE1601_REG_ICR_LSB 0x11 +#define STMPE1601_REG_IER_LSB 0x13 +#define STMPE1601_REG_ISR_MSB 0x14 +#define STMPE1601_REG_CHIP_ID 0x80 +#define STMPE1601_REG_INT_EN_GPIO_MASK_LSB 0x17 +#define STMPE1601_REG_INT_STA_GPIO_MSB 0x18 +#define STMPE1601_REG_GPIO_MP_LSB 0x87 +#define STMPE1601_REG_GPIO_SET_LSB 0x83 +#define STMPE1601_REG_GPIO_CLR_LSB 0x85 +#define STMPE1601_REG_GPIO_SET_DIR_LSB 0x89 +#define STMPE1601_REG_GPIO_ED_MSB 0x8A +#define STMPE1601_REG_GPIO_RE_LSB 0x8D +#define STMPE1601_REG_GPIO_FE_LSB 0x8F +#define STMPE1601_REG_GPIO_AF_U_MSB 0x92 + +#define STMPE1601_SYS_CTRL_ENABLE_GPIO (1 << 3) +#define STMPE1601_SYS_CTRL_ENABLE_KPC (1 << 1) +#define STMPE1601_SYSCON_ENABLE_SPWM (1 << 0) + +/* + * STMPE24xx + */ + +#define STMPE24XX_IRQ_GPIOC 8 +#define STMPE24XX_IRQ_PWM2 7 +#define STMPE24XX_IRQ_PWM1 6 +#define STMPE24XX_IRQ_PWM0 5 +#define STMPE24XX_IRQ_ROT_OVER 4 +#define STMPE24XX_IRQ_ROT 3 +#define STMPE24XX_IRQ_KEYPAD_OVER 2 +#define STMPE24XX_IRQ_KEYPAD 1 +#define STMPE24XX_IRQ_WAKEUP 0 +#define STMPE24XX_NR_INTERNAL_IRQS 9 + +#define STMPE24XX_REG_SYS_CTRL 0x02 +#define STMPE24XX_REG_ICR_LSB 0x11 +#define STMPE24XX_REG_IER_LSB 0x13 +#define STMPE24XX_REG_ISR_MSB 0x14 +#define STMPE24XX_REG_CHIP_ID 0x80 +#define STMPE24XX_REG_IEGPIOR_LSB 0x18 +#define STMPE24XX_REG_ISGPIOR_MSB 0x19 +#define STMPE24XX_REG_GPMR_LSB 0xA5 +#define STMPE24XX_REG_GPSR_LSB 0x85 +#define STMPE24XX_REG_GPCR_LSB 0x88 +#define STMPE24XX_REG_GPDR_LSB 0x8B +#define STMPE24XX_REG_GPEDR_MSB 0x8C +#define STMPE24XX_REG_GPRER_LSB 0x91 +#define STMPE24XX_REG_GPFER_LSB 0x94 +#define STMPE24XX_REG_GPAFR_U_MSB 0x9B + +#define STMPE24XX_SYS_CTRL_ENABLE_GPIO (1 << 3) +#define STMPE24XX_SYSCON_ENABLE_PWM (1 << 2) +#define STMPE24XX_SYS_CTRL_ENABLE_KPC (1 << 1) +#define STMPE24XX_SYSCON_ENABLE_ROT (1 << 0) + +#endif diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h new file mode 100644 index 00000000000..90faa98b577 --- /dev/null +++ b/include/linux/mfd/stmpe.h @@ -0,0 +1,197 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License, version 2 + * Author: Rabin Vincent for ST-Ericsson + */ + +#ifndef __LINUX_MFD_STMPE_H +#define __LINUX_MFD_STMPE_H + +#include + +enum stmpe_block { + STMPE_BLOCK_GPIO = 1 << 0, + STMPE_BLOCK_KEYPAD = 1 << 1, + STMPE_BLOCK_TOUCHSCREEN = 1 << 2, + STMPE_BLOCK_ADC = 1 << 3, + STMPE_BLOCK_PWM = 1 << 4, + STMPE_BLOCK_ROTATOR = 1 << 5, +}; + +enum stmpe_partnum { + STMPE811, + STMPE1601, + STMPE2401, + STMPE2403, +}; + +/* + * For registers whose locations differ on variants, the correct address is + * obtained by indexing stmpe->regs with one of the following. + */ +enum { + STMPE_IDX_CHIP_ID, + STMPE_IDX_ICR_LSB, + STMPE_IDX_IER_LSB, + STMPE_IDX_ISR_MSB, + STMPE_IDX_GPMR_LSB, + STMPE_IDX_GPSR_LSB, + STMPE_IDX_GPCR_LSB, + STMPE_IDX_GPDR_LSB, + STMPE_IDX_GPEDR_MSB, + STMPE_IDX_GPRER_LSB, + STMPE_IDX_GPFER_LSB, + STMPE_IDX_GPAFR_U_MSB, + STMPE_IDX_IEGPIOR_LSB, + STMPE_IDX_ISGPIOR_MSB, + STMPE_IDX_MAX, +}; + + +struct stmpe_variant_info; + +/** + * struct stmpe - STMPE MFD structure + * @lock: lock protecting I/O operations + * @irq_lock: IRQ bus lock + * @dev: device, mostly for dev_dbg() + * @i2c: i2c client + * @variant: the detected STMPE model number + * @regs: list of addresses of registers which are at different addresses on + * different variants. Indexed by one of STMPE_IDX_*. + * @irq_base: starting IRQ number for internal IRQs + * @num_gpios: number of gpios, differs for variants + * @ier: cache of IER registers for bus_lock + * @oldier: cache of IER registers for bus_lock + * @pdata: platform data + */ +struct stmpe { + struct mutex lock; + struct mutex irq_lock; + struct device *dev; + struct i2c_client *i2c; + enum stmpe_partnum partnum; + struct stmpe_variant_info *variant; + const u8 *regs; + + int irq_base; + int num_gpios; + u8 ier[2]; + u8 oldier[2]; + struct stmpe_platform_data *pdata; +}; + +extern int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 data); +extern int stmpe_reg_read(struct stmpe *stmpe, u8 reg); +extern int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, + u8 *values); +extern int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, + const u8 *values); +extern int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val); +extern int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, + enum stmpe_block block); +extern int stmpe_enable(struct stmpe *stmpe, unsigned int blocks); +extern int stmpe_disable(struct stmpe *stmpe, unsigned int blocks); + +struct matrix_keymap_data; + +/** + * struct stmpe_keypad_platform_data - STMPE keypad platform data + * @keymap_data: key map table and size + * @debounce_ms: debounce interval, in ms. Maximum is + * %STMPE_KEYPAD_MAX_DEBOUNCE. + * @scan_count: number of key scanning cycles to confirm key data. + * Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT. + * @no_autorepeat: disable key autorepeat + */ +struct stmpe_keypad_platform_data { + struct matrix_keymap_data *keymap_data; + unsigned int debounce_ms; + unsigned int scan_count; + bool no_autorepeat; +}; + +/** + * struct stmpe_gpio_platform_data - STMPE GPIO platform data + * @gpio_base: first gpio number assigned. A maximum of + * %STMPE_NR_GPIOS GPIOs will be allocated. + */ +struct stmpe_gpio_platform_data { + int gpio_base; + void (*setup)(struct stmpe *stmpe, unsigned gpio_base); + void (*remove)(struct stmpe *stmpe, unsigned gpio_base); +}; + +/** + * struct stmpe_ts_platform_data - stmpe811 touch screen controller platform + * data + * @sample_time: ADC converstion time in number of clock. + * (0 -> 36 clocks, 1 -> 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, + * 4 -> 80 clocks, 5 -> 96 clocks, 6 -> 144 clocks), + * recommended is 4. + * @mod_12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC) + * @ref_sel: ADC reference source + * (0 -> internal reference, 1 -> external reference) + * @adc_freq: ADC Clock speed + * (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz) + * @ave_ctrl: Sample average control + * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples) + * @touch_det_delay: Touch detect interrupt delay + * (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us, + * 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) + * recommended is 3 + * @settling: Panel driver settling time + * (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms, + * 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) + * recommended is 2 + * @fraction_z: Length of the fractional part in z + * (fraction_z ([0..7]) = Count of the fractional part) + * recommended is 7 + * @i_drive: current limit value of the touchscreen drivers + * (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max) + * + * */ +struct stmpe_ts_platform_data { + u8 sample_time; + u8 mod_12b; + u8 ref_sel; + u8 adc_freq; + u8 ave_ctrl; + u8 touch_det_delay; + u8 settling; + u8 fraction_z; + u8 i_drive; +}; + +/** + * struct stmpe_platform_data - STMPE platform data + * @id: device id to distinguish between multiple STMPEs on the same board + * @blocks: bitmask of blocks to enable (use STMPE_BLOCK_*) + * @irq_trigger: IRQ trigger to use for the interrupt to the host + * @irq_invert_polarity: IRQ line is connected with reversed polarity + * @irq_base: base IRQ number. %STMPE_NR_IRQS irqs will be used, or + * %STMPE_NR_INTERNAL_IRQS if the GPIO driver is not used. + * @gpio: GPIO-specific platform data + * @keypad: keypad-specific platform data + * @ts: touchscreen-specific platform data + */ +struct stmpe_platform_data { + int id; + unsigned int blocks; + int irq_base; + unsigned int irq_trigger; + bool irq_invert_polarity; + + struct stmpe_gpio_platform_data *gpio; + struct stmpe_keypad_platform_data *keypad; + struct stmpe_ts_platform_data *ts; +}; + +#define STMPE_NR_INTERNAL_IRQS 9 +#define STMPE_INT_GPIO(x) (STMPE_NR_INTERNAL_IRQS + (x)) + +#define STMPE_NR_GPIOS 24 +#define STMPE_NR_IRQS STMPE_INT_GPIO(STMPE_NR_GPIOS) + +#endif -- cgit v1.2.3-18-g5258 From 03f822f5e5f5924f4ad372d3e698855c6a9275e0 Mon Sep 17 00:00:00 2001 From: Rabin Vincent Date: Fri, 2 Jul 2010 16:52:09 +0530 Subject: gpio: Add STMPE GPIO driver Add support for the GPIOs on STMPE I/O Expanders. [l.fu@pengutronix.de: fix set direction input] [l.fu@pengutronix.de: set GPIO alternate function while requesting] Acked-by: Luotao Fu Acked-by: Linus Walleij Signed-off-by: Rabin Vincent Signed-off-by: Samuel Ortiz --- drivers/gpio/Kconfig | 7 + drivers/gpio/Makefile | 1 + drivers/gpio/stmpe-gpio.c | 399 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 407 insertions(+) create mode 100644 drivers/gpio/stmpe-gpio.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index f623953b579..510aa205454 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -206,6 +206,13 @@ config GPIO_SX150X 8 bits: sx1508q 16 bits: sx1509q +config GPIO_STMPE + bool "STMPE GPIOs" + depends on MFD_STMPE + help + This enables support for the GPIOs found on the STMPE I/O + Expanders. + config GPIO_TC35892 bool "TC35892 GPIOs" depends on MFD_TC35892 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index a69e0609ff7..fc6019d9372 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o obj-$(CONFIG_GPIO_PCA953X) += pca953x.o obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o obj-$(CONFIG_GPIO_PL061) += pl061.o +obj-$(CONFIG_GPIO_STMPE) += stmpe-gpio.o obj-$(CONFIG_GPIO_TC35892) += tc35892-gpio.o obj-$(CONFIG_GPIO_TIMBERDALE) += timbgpio.o obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o diff --git a/drivers/gpio/stmpe-gpio.c b/drivers/gpio/stmpe-gpio.c new file mode 100644 index 00000000000..4e1f1b9d5e6 --- /dev/null +++ b/drivers/gpio/stmpe-gpio.c @@ -0,0 +1,399 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License, version 2 + * Author: Rabin Vincent for ST-Ericsson + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * These registers are modified under the irq bus lock and cached to avoid + * unnecessary writes in bus_sync_unlock. + */ +enum { REG_RE, REG_FE, REG_IE }; + +#define CACHE_NR_REGS 3 +#define CACHE_NR_BANKS (STMPE_NR_GPIOS / 8) + +struct stmpe_gpio { + struct gpio_chip chip; + struct stmpe *stmpe; + struct device *dev; + struct mutex irq_lock; + + int irq_base; + + /* Caches of interrupt control registers for bus_lock */ + u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS]; + u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS]; +}; + +static inline struct stmpe_gpio *to_stmpe_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct stmpe_gpio, chip); +} + +static int stmpe_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + struct stmpe *stmpe = stmpe_gpio->stmpe; + u8 reg = stmpe->regs[STMPE_IDX_GPMR_LSB] - (offset / 8); + u8 mask = 1 << (offset % 8); + int ret; + + ret = stmpe_reg_read(stmpe, reg); + if (ret < 0) + return ret; + + return ret & mask; +} + +static void stmpe_gpio_set(struct gpio_chip *chip, unsigned offset, int val) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + struct stmpe *stmpe = stmpe_gpio->stmpe; + int which = val ? STMPE_IDX_GPSR_LSB : STMPE_IDX_GPCR_LSB; + u8 reg = stmpe->regs[which] - (offset / 8); + u8 mask = 1 << (offset % 8); + + stmpe_reg_write(stmpe, reg, mask); +} + +static int stmpe_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int val) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + struct stmpe *stmpe = stmpe_gpio->stmpe; + u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8); + u8 mask = 1 << (offset % 8); + + stmpe_gpio_set(chip, offset, val); + + return stmpe_set_bits(stmpe, reg, mask, mask); +} + +static int stmpe_gpio_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + struct stmpe *stmpe = stmpe_gpio->stmpe; + u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8); + u8 mask = 1 << (offset % 8); + + return stmpe_set_bits(stmpe, reg, mask, 0); +} + +static int stmpe_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + + return stmpe_gpio->irq_base + offset; +} + +static int stmpe_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip); + struct stmpe *stmpe = stmpe_gpio->stmpe; + + return stmpe_set_altfunc(stmpe, 1 << offset, STMPE_BLOCK_GPIO); +} + +static struct gpio_chip template_chip = { + .label = "stmpe", + .owner = THIS_MODULE, + .direction_input = stmpe_gpio_direction_input, + .get = stmpe_gpio_get, + .direction_output = stmpe_gpio_direction_output, + .set = stmpe_gpio_set, + .to_irq = stmpe_gpio_to_irq, + .request = stmpe_gpio_request, + .can_sleep = 1, +}; + +static int stmpe_gpio_irq_set_type(unsigned int irq, unsigned int type) +{ + struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq); + int offset = irq - stmpe_gpio->irq_base; + int regoffset = offset / 8; + int mask = 1 << (offset % 8); + + if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH) + return -EINVAL; + + if (type == IRQ_TYPE_EDGE_RISING) + stmpe_gpio->regs[REG_RE][regoffset] |= mask; + else + stmpe_gpio->regs[REG_RE][regoffset] &= ~mask; + + if (type == IRQ_TYPE_EDGE_FALLING) + stmpe_gpio->regs[REG_FE][regoffset] |= mask; + else + stmpe_gpio->regs[REG_FE][regoffset] &= ~mask; + + return 0; +} + +static void stmpe_gpio_irq_lock(unsigned int irq) +{ + struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq); + + mutex_lock(&stmpe_gpio->irq_lock); +} + +static void stmpe_gpio_irq_sync_unlock(unsigned int irq) +{ + struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq); + struct stmpe *stmpe = stmpe_gpio->stmpe; + int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8); + static const u8 regmap[] = { + [REG_RE] = STMPE_IDX_GPRER_LSB, + [REG_FE] = STMPE_IDX_GPFER_LSB, + [REG_IE] = STMPE_IDX_IEGPIOR_LSB, + }; + int i, j; + + for (i = 0; i < CACHE_NR_REGS; i++) { + for (j = 0; j < num_banks; j++) { + u8 old = stmpe_gpio->oldregs[i][j]; + u8 new = stmpe_gpio->regs[i][j]; + + if (new == old) + continue; + + stmpe_gpio->oldregs[i][j] = new; + stmpe_reg_write(stmpe, stmpe->regs[regmap[i]] - j, new); + } + } + + mutex_unlock(&stmpe_gpio->irq_lock); +} + +static void stmpe_gpio_irq_mask(unsigned int irq) +{ + struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq); + int offset = irq - stmpe_gpio->irq_base; + int regoffset = offset / 8; + int mask = 1 << (offset % 8); + + stmpe_gpio->regs[REG_IE][regoffset] &= ~mask; +} + +static void stmpe_gpio_irq_unmask(unsigned int irq) +{ + struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq); + int offset = irq - stmpe_gpio->irq_base; + int regoffset = offset / 8; + int mask = 1 << (offset % 8); + + stmpe_gpio->regs[REG_IE][regoffset] |= mask; +} + +static struct irq_chip stmpe_gpio_irq_chip = { + .name = "stmpe-gpio", + .bus_lock = stmpe_gpio_irq_lock, + .bus_sync_unlock = stmpe_gpio_irq_sync_unlock, + .mask = stmpe_gpio_irq_mask, + .unmask = stmpe_gpio_irq_unmask, + .set_type = stmpe_gpio_irq_set_type, +}; + +static irqreturn_t stmpe_gpio_irq(int irq, void *dev) +{ + struct stmpe_gpio *stmpe_gpio = dev; + struct stmpe *stmpe = stmpe_gpio->stmpe; + u8 statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB]; + int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8); + u8 status[num_banks]; + int ret; + int i; + + ret = stmpe_block_read(stmpe, statmsbreg, num_banks, status); + if (ret < 0) + return IRQ_NONE; + + for (i = 0; i < num_banks; i++) { + int bank = num_banks - i - 1; + unsigned int enabled = stmpe_gpio->regs[REG_IE][bank]; + unsigned int stat = status[i]; + + stat &= enabled; + if (!stat) + continue; + + while (stat) { + int bit = __ffs(stat); + int line = bank * 8 + bit; + + handle_nested_irq(stmpe_gpio->irq_base + line); + stat &= ~(1 << bit); + } + + stmpe_reg_write(stmpe, statmsbreg + i, status[i]); + stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB] + i, + status[i]); + } + + return IRQ_HANDLED; +} + +static int __devinit stmpe_gpio_irq_init(struct stmpe_gpio *stmpe_gpio) +{ + int base = stmpe_gpio->irq_base; + int irq; + + for (irq = base; irq < base + stmpe_gpio->chip.ngpio; irq++) { + set_irq_chip_data(irq, stmpe_gpio); + set_irq_chip_and_handler(irq, &stmpe_gpio_irq_chip, + handle_simple_irq); + set_irq_nested_thread(irq, 1); +#ifdef CONFIG_ARM + set_irq_flags(irq, IRQF_VALID); +#else + set_irq_noprobe(irq); +#endif + } + + return 0; +} + +static void stmpe_gpio_irq_remove(struct stmpe_gpio *stmpe_gpio) +{ + int base = stmpe_gpio->irq_base; + int irq;