From patchwork Mon Oct 21 13:54:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Denis Carikli X-Patchwork-Id: 3077481 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 809699F372 for ; Mon, 21 Oct 2013 13:55:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E275220364 for ; Mon, 21 Oct 2013 13:55:15 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F3E3C20377 for ; Mon, 21 Oct 2013 13:55:13 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VYFws-0000Zg-AY; Mon, 21 Oct 2013 13:55:10 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VYFwp-0003Vk-ON; Mon, 21 Oct 2013 13:55:07 +0000 Received: from smtp1-g21.free.fr ([2a01:e0c:1:1599::10]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VYFwk-0003Ud-6j for linux-arm-kernel@lists.infradead.org; Mon, 21 Oct 2013 13:55:04 +0000 Received: from denis-N73SV.local.eukrea.com (unknown [88.170.243.169]) by smtp1-g21.free.fr (Postfix) with ESMTP id 14034940473; Mon, 21 Oct 2013 15:54:31 +0200 (CEST) From: Denis Carikli To: =?UTF-8?q?Lothar=20Wa=C3=9Fmann?= , Dmitry Torokhov Subject: [PATCHv4][ 1/4] Input: tsc2007: Add device tree support. Date: Mon, 21 Oct 2013 15:54:24 +0200 Message-Id: <1382363667-10341-1-git-send-email-denis@eukrea.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131021_095503_224811_E8DFF8D2 X-CRM114-Status: GOOD ( 28.24 ) X-Spam-Score: -1.2 (-) Cc: Mark Rutland , devicetree@vger.kernel.org, Sascha Hauer , Pawel Moll , Stephen Warren , Ian Campbell , Rob Herring , Denis Carikli , =?UTF-8?q?Eric=20B=C3=A9nard?= , linux-input@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cc: Rob Herring Cc: Pawel Moll Cc: Mark Rutland Cc: Stephen Warren Cc: Ian Campbell Cc: devicetree@vger.kernel.org Cc: Dmitry Torokhov Cc: linux-input@vger.kernel.org Cc: Sascha Hauer Cc: linux-arm-kernel@lists.infradead.org Cc: Lothar Waßmann Cc: Eric Bénard Signed-off-by: Denis Carikli --- ChangeLog v2->v4: - The x-plate-ohms property was renamed to ti,x-plate-ohms. - multilines strings were avoided. - shorten the message related to the lack of ti,x-plate-ohms in the dts. - whitespace fix in tsc2007_get_pendown_state_dt(struct tsc2007 *ts) - (ts->gpio < 0) replaced by !gpio_is_valid(ts->gpio) - devm_kzalloc is now used instead of kzalloc, and some minor code change was made because of that. --- .../bindings/input/touchscreen/tsc2007.txt | 44 +++++ drivers/input/touchscreen/tsc2007.c | 201 +++++++++++++++----- 2 files changed, 200 insertions(+), 45 deletions(-) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt new file mode 100644 index 0000000..fadd3f6 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt @@ -0,0 +1,44 @@ +* Texas Instruments tsc2007 touchscreen controller + +Required properties: +- compatible: must be "ti,tsc2007". +- reg: I2C address of the chip. +- pinctrl-0: Should specify pin control groups used for this controller + (see pinctrl bindings[0]). +- pinctrl-names: Should contain only one value - "default" + (see pinctrl bindings[0]). +- interrupt-parent: the phandle for the interrupt controller + (see interrupt binding[1]). +- interrupts: interrupt to which the chip is connected + (see interrupt binding[1]). +- ti,x-plate-ohms: X-plate resistance in ohms. + +Optional properties: +- gpios: the interrupt gpio the chip is connected to (trough the penirq pin) + (see GPIO binding[2] for more details). +- max-rt: maximum pressure. +- fuzzy: specifies the fuzz value that is used to filter noise from the event + stream. +- poll-period: how much time to wait(in millisecond) before reading again the + values from the tsc2007. + +[0]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt +[1]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt +[2]: Documentation/devicetree/bindings/gpio/gpio.txt + +Example: + &i2c1 { + /* ... */ + tsc2007@49 { + compatible = "ti,tsc2007"; + reg = <0x49>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_tsc2007_1>; + interrupt-parent = <&gpio4>; + interrupts = <0x0 0x8>; + gpios = <&gpio4 0 0>; + ti,x-plate-ohms = <180>; + }; + + /* ... */ + }; diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c index 0b67ba4..3143ebc 100644 --- a/drivers/input/touchscreen/tsc2007.c +++ b/drivers/input/touchscreen/tsc2007.c @@ -26,6 +26,9 @@ #include #include #include +#include +#include +#include #define TSC2007_MEASURE_TEMP0 (0x0 << 4) #define TSC2007_MEASURE_AUX (0x2 << 4) @@ -74,7 +77,10 @@ struct tsc2007 { u16 max_rt; unsigned long poll_delay; unsigned long poll_period; + int fuzzy; + char of; + unsigned gpio; int irq; wait_queue_head_t wait; @@ -84,6 +90,14 @@ struct tsc2007 { void (*clear_penirq)(void); }; +static int tsc2007_get_pendown_state_dt(struct tsc2007 *ts) +{ + if (gpio_is_valid(ts->gpio)) + return !gpio_get_value(ts->gpio); + else + return true; +} + static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd) { s32 data; @@ -158,6 +172,9 @@ static bool tsc2007_is_pen_down(struct tsc2007 *ts) * to fall back on the pressure reading. */ + if (ts->of) + return tsc2007_get_pendown_state_dt(ts); + if (!ts->get_pendown_state) return true; @@ -175,10 +192,10 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle) /* pen is down, continue with the measurement */ tsc2007_read_values(ts, &tc); - rt = tsc2007_calculate_pressure(ts, &tc); - if (rt == 0 && !ts->get_pendown_state) { + if ((ts->of && rt == 0 && !gpio_is_valid(ts->gpio)) || + (!ts->of && rt == 0 && !ts->get_pendown_state)) { /* * If pressure reported is 0 and we don't have * callback to check pendown state, we have to @@ -198,7 +215,6 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle) input_report_abs(input, ABS_PRESSURE, rt); input_sync(input); - } else { /* * Sample found inconsistent by debouncing or pressure is @@ -217,7 +233,6 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle) input_report_key(input, BTN_TOUCH, 0); input_report_abs(input, ABS_PRESSURE, 0); input_sync(input); - if (ts->clear_penirq) ts->clear_penirq(); @@ -228,11 +243,17 @@ static irqreturn_t tsc2007_hard_irq(int irq, void *handle) { struct tsc2007 *ts = handle; - if (!ts->get_pendown_state || likely(ts->get_pendown_state())) - return IRQ_WAKE_THREAD; + if (!ts->of) { + if (!ts->get_pendown_state || likely(ts->get_pendown_state())) + return IRQ_WAKE_THREAD; - if (ts->clear_penirq) - ts->clear_penirq(); + if (ts->clear_penirq) + ts->clear_penirq(); + } else { + if ((!gpio_is_valid(ts->gpio)) || + likely(tsc2007_get_pendown_state_dt(ts))) + return IRQ_WAKE_THREAD; + } return IRQ_HANDLED; } @@ -273,34 +294,65 @@ static void tsc2007_close(struct input_dev *input_dev) tsc2007_stop(ts); } -static int tsc2007_probe(struct i2c_client *client, - const struct i2c_device_id *id) +#ifdef CONFIG_OF +static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts, + struct device_node *np) { - struct tsc2007 *ts; - struct tsc2007_platform_data *pdata = client->dev.platform_data; - struct input_dev *input_dev; - int err; - - if (!pdata) { - dev_err(&client->dev, "platform data is required!\n"); + int err = 0; + u32 val32; + u64 val64; + + if (!of_property_read_u32(np, "max-rt", &val32)) + ts->max_rt = val32; + else + ts->max_rt = MAX_12BIT; + + if (!of_property_read_u32(np, "fuzzy", &val32)) + ts->fuzzy = val32; + + if (!of_property_read_u64(np, "poll-period", &val64)) + ts->poll_period = val64; + else + ts->poll_period = 1; + + if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) { + ts->x_plate_ohms = val32; + } else { + dev_err(&client->dev, + "Error: lacking ti,x-plate-ohms devicetree property. (err %d).", + err); return -EINVAL; } - if (!i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_WORD_DATA)) - return -EIO; + ts->gpio = of_get_gpio(np, 0); + if (!gpio_is_valid(ts->gpio)) + dev_err(&client->dev, + "GPIO not found (of_get_gpio returned %d)\n", + ts->gpio); - ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL); - input_dev = input_allocate_device(); - if (!ts || !input_dev) { - err = -ENOMEM; - goto err_free_mem; - } + /* Used to detect if it is probed trough the device tree, + * in order to be able to use that information in the IRQ handler. + */ + ts->of = 1; - ts->client = client; - ts->irq = client->irq; - ts->input = input_dev; - init_waitqueue_head(&ts->wait); + return 0; +} +#else +static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts, + struct device_node *np) +{ + return -ENODEV; +} +#endif + +static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts, + struct tsc2007_platform_data *pdata, + const struct i2c_device_id *id) +{ + if (!pdata) { + dev_err(&client->dev, "platform data is required!\n"); + return -EINVAL; + } ts->model = pdata->model; ts->x_plate_ohms = pdata->x_plate_ohms; @@ -309,13 +361,57 @@ static int tsc2007_probe(struct i2c_client *client, ts->poll_period = pdata->poll_period ? : 1; ts->get_pendown_state = pdata->get_pendown_state; ts->clear_penirq = pdata->clear_penirq; + ts->fuzzy = pdata->fuzzy; if (pdata->x_plate_ohms == 0) { dev_err(&client->dev, "x_plate_ohms is not set up in platform data"); - err = -EINVAL; - goto err_free_mem; + return -EINVAL; } + /* Used to detect if it is probed trough the device tree, + * in order to be able to use that information in the IRQ handler. + */ + ts->of = 0; + + return 0; +} + +static int tsc2007_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device_node *np = client->dev.of_node; + struct tsc2007_platform_data *pdata = client->dev.platform_data; + struct tsc2007 *ts; + struct input_dev *input_dev; + int err = 0; + + ts = devm_kzalloc(sizeof(struct tsc2007), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + if (np) + err = tsc2007_probe_dt(client, ts, np); + else + err = tsc2007_probe_pdev(client, ts, pdata, id); + + if (err) + return err; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_WORD_DATA)) + return -EIO; + + input_dev = input_allocate_device(); + if (!input_dev) { + err = -ENOMEM; + goto err_free_input; + }; + + ts->client = client; + ts->irq = client->irq; + ts->input = input_dev; + init_waitqueue_head(&ts->wait); + snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&client->dev)); @@ -331,19 +427,21 @@ static int tsc2007_probe(struct i2c_client *client, input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); - input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, pdata->fuzzx, 0); - input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0); + input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzy, 0); + input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0); input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, - pdata->fuzzz, 0); + ts->fuzzy, 0); - if (pdata->init_platform_hw) - pdata->init_platform_hw(); + if (!np) { + if (pdata->init_platform_hw) + pdata->init_platform_hw(); + } err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq, IRQF_ONESHOT, client->dev.driver->name, ts); if (err < 0) { dev_err(&client->dev, "irq %d busy?\n", ts->irq); - goto err_free_mem; + goto err_free_input; } tsc2007_stop(ts); @@ -358,23 +456,27 @@ static int tsc2007_probe(struct i2c_client *client, err_free_irq: free_irq(ts->irq, ts); - if (pdata->exit_platform_hw) - pdata->exit_platform_hw(); - err_free_mem: + if (!np) { + if (pdata->exit_platform_hw) + pdata->exit_platform_hw(); + } + err_free_input: input_free_device(input_dev); - kfree(ts); return err; } static int tsc2007_remove(struct i2c_client *client) { + struct device_node *np = client->dev.of_node; struct tsc2007 *ts = i2c_get_clientdata(client); struct tsc2007_platform_data *pdata = client->dev.platform_data; free_irq(ts->irq, ts); - if (pdata->exit_platform_hw) - pdata->exit_platform_hw(); + if (!np) { + if (pdata->exit_platform_hw) + pdata->exit_platform_hw(); + } input_unregister_device(ts->input); kfree(ts); @@ -389,10 +491,19 @@ static const struct i2c_device_id tsc2007_idtable[] = { MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); +#ifdef CONFIG_OF +static const struct of_device_id tsc2007_of_match[] = { + { .compatible = "ti,tsc2007" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, tsc2007_of_match); +#endif + static struct i2c_driver tsc2007_driver = { .driver = { .owner = THIS_MODULE, - .name = "tsc2007" + .name = "tsc2007", + .of_match_table = of_match_ptr(tsc2007_of_match), }, .id_table = tsc2007_idtable, .probe = tsc2007_probe,