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![Linus Torvalds](/assets/img/avatar_default.png)
Infrastructural changes: - In struct gpio_chip, rename the .dev node to .parent to better reflect the fact that this is not the GPIO struct device abstraction. We will add that soon so this would be totallt confusing. - It was noted that the driver .get_value() callbacks was sometimes reporting negative -ERR values to the gpiolib core, expecting them to be propagated to consumer gpiod_get_value() and gpio_get_value() calls. This was not happening, so as there was a mess of drivers returning negative errors and some returning "anything else than zero" to indicate that a line was active. As some would have bit 31 set to indicate "line active" it clashed with negative error codes. This is fixed by the largeish series clamping values in all drivers with !!value to [0,1] and then augmenting the code to propagate error codes to consumers. (Includes some ACKed patches in other subsystems.) - Add a void *data pointer to struct gpio_chip. The container_of() design pattern is indeed very nice, but we want to reform the struct gpio_chip to be a non-volative, stateless business, and keep states internal to the gpiolib to be able to hold on to the state when adding a proper userspace ABI (character device) further down the road. To achieve this, drivers need a handle at the internal state that is not dependent on their struct gpio_chip() so we add gpiochip_add_data() and gpiochip_get_data() following the pattern of many other subsystems. All the "use gpiochip data pointer" patches transforms drivers to this scheme. - The Generic GPIO chip header has been merged into the general <linux/gpio/driver.h> header, and the custom header for that removed. Instead of having a separate mm_gpio_chip struct for these generic drivers, merge that into struct gpio_chip, simplifying the code and removing the need for separate and confusing includes. Misc improvements: - Stabilize the way GPIOs are looked up from the ACPI legacy specification. - Incremental driver features for PXA, PCA953X, Lantiq (patches from the OpenWRT community), RCAR, Zynq, PL061, 104-idi-48 New drivers: - Add a GPIO chip to the ALSA SoC AC97 driver. - Add a new Broadcom NSP SoC driver (this lands in the pinctrl dir, but the branch is merged here too to account for infrastructural changes). - The sx150x driver now supports the sx1502. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJWmsZhAAoJEEEQszewGV1ztq0QAJ1KbNOpmf/s3INkOH4r771Z WIrNEsmwwLIAryo8gKNOM0H1zCwhRUV7hIE5jYWgD6JvjuAN6vobMlZAq21j6YpB pKgqnI5DuoND450xjb8wSwGQ5NTYp1rFXNmwCrtyTjOle6AAW+Kp2cvVWxVr77Av uJinRuuBr9GOKW/yYM1Fw/6EPjkvvhVOb+LBguRyVvq0s5Peyw7ZVeY1tjgPHJLn oSZ9dmPUjHEn91oZQbtfro3plOObcxdgJ8vo//pgEmyhMeR8XjXES+aUfErxqWOU PimrZuMMy4cxnsqWwh3Dyxo7KSWfJKfSPRwnGwc/HgbHZEoWxOZI1ezRtGKrRQtj vubxp5dUBA5z66TMsOCeJtzKVSofkvgX2Wr/Y9jKp5oy9cHdAZv9+jEHV1pr6asz Tas97MmmO77XuRI/GPDqVHx8dfa15OIz9s92+Gu64KxNzVxTo4+NdoPSNxkbCILO FKn7EmU3D0OjmN2NJ9GAURoFaj3BBUgNhaxacG9j2bieyh+euuUHRtyh2k8zXR9y 8OnY1UOrTUYF8YIq9pXZxMQRD/lqwCNHvEjtI6BqMcNx4MptfTL+FKYUkn/SgCYk QTNV6Ui+ety5D5aEpp5q0ItGsrDJ2LYSItsS+cOtMy2ieOxbQav9NWwu7eI3l5ly gwYTZjG9p9joPXLW0E3g =63rR -----END PGP SIGNATURE----- Merge tag 'gpio-v4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "Here is the bulk of GPIO changes for v4.5. Notably there are big refactorings mostly by myself, aimed at getting the gpio_chip into a shape that makes me believe I can proceed to preserve state for a proper userspace ABI (character device) that has already been proposed once, but resulted in the feedback that I need to go back and restructure stuff. So I've been restructuring stuff. On the way I ran into brokenness (return code from the get_value() callback) and had to fix it. Also, refactored generic GPIO to be simpler. Some of that is still waiting to trickle down from the subsystems all over the kernel that provide random gpio_chips, I've touched every single GPIO driver in the kernel now, oh man I didn't know I was responsible for so much... Apart from that we're churning along as usual. I took some effort to test and retest so it should merge nicely and we shook out a couple of bugs in -next. Infrastructural changes: - In struct gpio_chip, rename the .dev node to .parent to better reflect the fact that this is not the GPIO struct device abstraction. We will add that soon so this would be totallt confusing. - It was noted that the driver .get_value() callbacks was sometimes reporting negative -ERR values to the gpiolib core, expecting them to be propagated to consumer gpiod_get_value() and gpio_get_value() calls. This was not happening, so as there was a mess of drivers returning negative errors and some returning "anything else than zero" to indicate that a line was active. As some would have bit 31 set to indicate "line active" it clashed with negative error codes. This is fixed by the largeish series clamping values in all drivers with !!value to [0,1] and then augmenting the code to propagate error codes to consumers. (Includes some ACKed patches in other subsystems.) - Add a void *data pointer to struct gpio_chip. The container_of() design pattern is indeed very nice, but we want to reform the struct gpio_chip to be a non-volative, stateless business, and keep states internal to the gpiolib to be able to hold on to the state when adding a proper userspace ABI (character device) further down the road. To achieve this, drivers need a handle at the internal state that is not dependent on their struct gpio_chip() so we add gpiochip_add_data() and gpiochip_get_data() following the pattern of many other subsystems. All the "use gpiochip data pointer" patches transforms drivers to this scheme. - The Generic GPIO chip header has been merged into the general <linux/gpio/driver.h> header, and the custom header for that removed. Instead of having a separate mm_gpio_chip struct for these generic drivers, merge that into struct gpio_chip, simplifying the code and removing the need for separate and confusing includes. Misc improvements: - Stabilize the way GPIOs are looked up from the ACPI legacy specification. - Incremental driver features for PXA, PCA953X, Lantiq (patches from the OpenWRT community), RCAR, Zynq, PL061, 104-idi-48 New drivers: - Add a GPIO chip to the ALSA SoC AC97 driver. - Add a new Broadcom NSP SoC driver (this lands in the pinctrl dir, but the branch is merged here too to account for infrastructural changes). - The sx150x driver now supports the sx1502" * tag 'gpio-v4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (220 commits) gpio: generic: make bgpio_pdata always visible gpiolib: fix chip order in gpio list gpio: mpc8xxx: Do not use gpiochip_get_data() in mpc8xxx_gpio_save_regs() gpio: mm-lantiq: Do not use gpiochip_get_data() in ltq_mm_save_regs() gpio: brcmstb: Allow building driver for BMIPS_GENERIC gpio: brcmstb: Set endian flags for big-endian MIPS gpio: moxart: fix build regression gpio: xilinx: Do not use gpiochip_get_data() in xgpio_save_regs() leds: pca9532: use gpiochip data pointer leds: tca6507: use gpiochip data pointer hid: cp2112: use gpiochip data pointer bcma: gpio: use gpiochip data pointer avr32: gpio: use gpiochip data pointer video: fbdev: via: use gpiochip data pointer gpio: pch: Optimize pch_gpio_get() Revert "pinctrl: lantiq: Implement gpio_chip.to_irq" pinctrl: nsp-gpio: use gpiochip data pointer pinctrl: vt8500-wmt: use gpiochip data pointer pinctrl: exynos5440: use gpiochip data pointer pinctrl: at91-pio4: use gpiochip data pointer ...
479 lines
12 KiB
C
479 lines
12 KiB
C
/*
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* pca9532.c - 16-bit Led dimmer
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*
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* Copyright (C) 2011 Jan Weitzel
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* Copyright (C) 2008 Riku Voipio
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
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*
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <linux/input.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/leds-pca9532.h>
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#include <linux/gpio.h>
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/* m = num_leds*/
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#define PCA9532_REG_INPUT(i) ((i) >> 3)
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#define PCA9532_REG_OFFSET(m) ((m) >> 4)
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#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
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#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
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#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
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#define LED_NUM(led) (led & 0x3)
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#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
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struct pca9532_chip_info {
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u8 num_leds;
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};
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struct pca9532_data {
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struct i2c_client *client;
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struct pca9532_led leds[16];
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struct mutex update_lock;
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struct input_dev *idev;
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struct work_struct work;
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#ifdef CONFIG_LEDS_PCA9532_GPIO
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struct gpio_chip gpio;
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#endif
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const struct pca9532_chip_info *chip_info;
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u8 pwm[2];
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u8 psc[2];
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};
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static int pca9532_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int pca9532_remove(struct i2c_client *client);
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enum {
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pca9530,
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pca9531,
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pca9532,
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pca9533,
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};
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static const struct i2c_device_id pca9532_id[] = {
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{ "pca9530", pca9530 },
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{ "pca9531", pca9531 },
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{ "pca9532", pca9532 },
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{ "pca9533", pca9533 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9532_id);
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static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
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[pca9530] = {
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.num_leds = 2,
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},
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[pca9531] = {
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.num_leds = 8,
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},
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[pca9532] = {
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.num_leds = 16,
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},
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[pca9533] = {
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.num_leds = 4,
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},
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};
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static struct i2c_driver pca9532_driver = {
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.driver = {
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.name = "leds-pca953x",
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},
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.probe = pca9532_probe,
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.remove = pca9532_remove,
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.id_table = pca9532_id,
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};
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/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
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* the clever Thecus people are using one pwm to drive the beeper. So,
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* as a compromise we average one pwm to the values requested by all
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* leds that are not ON/OFF.
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* */
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static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
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enum led_brightness value)
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{
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int a = 0, b = 0, i = 0;
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struct pca9532_data *data = i2c_get_clientdata(client);
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for (i = 0; i < data->chip_info->num_leds; i++) {
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if (data->leds[i].type == PCA9532_TYPE_LED &&
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data->leds[i].state == PCA9532_PWM0+pwm) {
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a++;
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b += data->leds[i].ldev.brightness;
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}
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}
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if (a == 0) {
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dev_err(&client->dev,
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"fear of division by zero %d/%d, wanted %d\n",
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b, a, value);
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return -EINVAL;
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}
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b = b/a;
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if (b > 0xFF)
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return -EINVAL;
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data->pwm[pwm] = b;
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data->psc[pwm] = blink;
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return 0;
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}
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static int pca9532_setpwm(struct i2c_client *client, int pwm)
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{
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struct pca9532_data *data = i2c_get_clientdata(client);
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u8 maxleds = data->chip_info->num_leds;
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
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data->pwm[pwm]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
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data->psc[pwm]);
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mutex_unlock(&data->update_lock);
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return 0;
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}
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/* Set LED routing */
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static void pca9532_setled(struct pca9532_led *led)
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{
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struct i2c_client *client = led->client;
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struct pca9532_data *data = i2c_get_clientdata(client);
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u8 maxleds = data->chip_info->num_leds;
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char reg;
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mutex_lock(&data->update_lock);
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reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
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/* zero led bits */
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reg = reg & ~(0x3<<LED_NUM(led->id)*2);
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/* set the new value */
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reg = reg | (led->state << LED_NUM(led->id)*2);
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i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
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mutex_unlock(&data->update_lock);
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}
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static int pca9532_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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int err = 0;
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struct pca9532_led *led = ldev_to_led(led_cdev);
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if (value == LED_OFF)
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led->state = PCA9532_OFF;
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else if (value == LED_FULL)
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led->state = PCA9532_ON;
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else {
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led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
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err = pca9532_calcpwm(led->client, 0, 0, value);
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if (err)
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return err;
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}
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if (led->state == PCA9532_PWM0)
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pca9532_setpwm(led->client, 0);
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pca9532_setled(led);
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return err;
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}
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static int pca9532_set_blink(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct pca9532_led *led = ldev_to_led(led_cdev);
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struct i2c_client *client = led->client;
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int psc;
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int err = 0;
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if (*delay_on == 0 && *delay_off == 0) {
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/* led subsystem ask us for a blink rate */
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*delay_on = 1000;
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*delay_off = 1000;
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}
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if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
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return -EINVAL;
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/* Thecus specific: only use PSC/PWM 0 */
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psc = (*delay_on * 152-1)/1000;
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err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
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if (err)
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return err;
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if (led->state == PCA9532_PWM0)
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pca9532_setpwm(led->client, 0);
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pca9532_setled(led);
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return 0;
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}
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static int pca9532_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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struct pca9532_data *data = input_get_drvdata(dev);
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if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
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return -1;
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/* XXX: allow different kind of beeps with psc/pwm modifications */
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if (value > 1 && value < 32767)
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data->pwm[1] = 127;
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else
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data->pwm[1] = 0;
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schedule_work(&data->work);
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return 0;
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}
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static void pca9532_input_work(struct work_struct *work)
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{
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struct pca9532_data *data =
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container_of(work, struct pca9532_data, work);
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u8 maxleds = data->chip_info->num_leds;
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
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data->pwm[1]);
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mutex_unlock(&data->update_lock);
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}
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#ifdef CONFIG_LEDS_PCA9532_GPIO
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static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
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{
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struct pca9532_data *data = gpiochip_get_data(gc);
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struct pca9532_led *led = &data->leds[offset];
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if (led->type == PCA9532_TYPE_GPIO)
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return 0;
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return -EBUSY;
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}
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static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
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{
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struct pca9532_data *data = gpiochip_get_data(gc);
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struct pca9532_led *led = &data->leds[offset];
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if (val)
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led->state = PCA9532_ON;
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else
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led->state = PCA9532_OFF;
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pca9532_setled(led);
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}
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static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
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{
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struct pca9532_data *data = gpiochip_get_data(gc);
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unsigned char reg;
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reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
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return !!(reg & (1 << (offset % 8)));
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}
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static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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/* To use as input ensure pin is not driven */
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pca9532_gpio_set_value(gc, offset, 0);
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return 0;
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}
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static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
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{
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pca9532_gpio_set_value(gc, offset, val);
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return 0;
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}
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#endif /* CONFIG_LEDS_PCA9532_GPIO */
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static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
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{
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int i = n_devs;
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if (!data)
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return -EINVAL;
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while (--i >= 0) {
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switch (data->leds[i].type) {
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case PCA9532_TYPE_NONE:
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case PCA9532_TYPE_GPIO:
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break;
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case PCA9532_TYPE_LED:
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led_classdev_unregister(&data->leds[i].ldev);
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break;
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case PCA9532_TYPE_N2100_BEEP:
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if (data->idev != NULL) {
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cancel_work_sync(&data->work);
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data->idev = NULL;
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}
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break;
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}
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}
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#ifdef CONFIG_LEDS_PCA9532_GPIO
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if (data->gpio.parent)
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gpiochip_remove(&data->gpio);
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#endif
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return 0;
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}
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static int pca9532_configure(struct i2c_client *client,
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struct pca9532_data *data, struct pca9532_platform_data *pdata)
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{
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int i, err = 0;
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int gpios = 0;
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u8 maxleds = data->chip_info->num_leds;
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for (i = 0; i < 2; i++) {
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data->pwm[i] = pdata->pwm[i];
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data->psc[i] = pdata->psc[i];
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i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
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data->pwm[i]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
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data->psc[i]);
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}
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for (i = 0; i < data->chip_info->num_leds; i++) {
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struct pca9532_led *led = &data->leds[i];
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struct pca9532_led *pled = &pdata->leds[i];
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led->client = client;
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|
led->id = i;
|
|
led->type = pled->type;
|
|
switch (led->type) {
|
|
case PCA9532_TYPE_NONE:
|
|
break;
|
|
case PCA9532_TYPE_GPIO:
|
|
gpios++;
|
|
break;
|
|
case PCA9532_TYPE_LED:
|
|
led->state = pled->state;
|
|
led->name = pled->name;
|
|
led->ldev.name = led->name;
|
|
led->ldev.brightness = LED_OFF;
|
|
led->ldev.brightness_set_blocking =
|
|
pca9532_set_brightness;
|
|
led->ldev.blink_set = pca9532_set_blink;
|
|
err = led_classdev_register(&client->dev, &led->ldev);
|
|
if (err < 0) {
|
|
dev_err(&client->dev,
|
|
"couldn't register LED %s\n",
|
|
led->name);
|
|
goto exit;
|
|
}
|
|
pca9532_setled(led);
|
|
break;
|
|
case PCA9532_TYPE_N2100_BEEP:
|
|
BUG_ON(data->idev);
|
|
led->state = PCA9532_PWM1;
|
|
pca9532_setled(led);
|
|
data->idev = devm_input_allocate_device(&client->dev);
|
|
if (data->idev == NULL) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
data->idev->name = pled->name;
|
|
data->idev->phys = "i2c/pca9532";
|
|
data->idev->id.bustype = BUS_HOST;
|
|
data->idev->id.vendor = 0x001f;
|
|
data->idev->id.product = 0x0001;
|
|
data->idev->id.version = 0x0100;
|
|
data->idev->evbit[0] = BIT_MASK(EV_SND);
|
|
data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
|
|
BIT_MASK(SND_TONE);
|
|
data->idev->event = pca9532_event;
|
|
input_set_drvdata(data->idev, data);
|
|
INIT_WORK(&data->work, pca9532_input_work);
|
|
err = input_register_device(data->idev);
|
|
if (err) {
|
|
cancel_work_sync(&data->work);
|
|
data->idev = NULL;
|
|
goto exit;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_LEDS_PCA9532_GPIO
|
|
if (gpios) {
|
|
data->gpio.label = "gpio-pca9532";
|
|
data->gpio.direction_input = pca9532_gpio_direction_input;
|
|
data->gpio.direction_output = pca9532_gpio_direction_output;
|
|
data->gpio.set = pca9532_gpio_set_value;
|
|
data->gpio.get = pca9532_gpio_get_value;
|
|
data->gpio.request = pca9532_gpio_request_pin;
|
|
data->gpio.can_sleep = 1;
|
|
data->gpio.base = pdata->gpio_base;
|
|
data->gpio.ngpio = data->chip_info->num_leds;
|
|
data->gpio.parent = &client->dev;
|
|
data->gpio.owner = THIS_MODULE;
|
|
|
|
err = gpiochip_add_data(&data->gpio, data);
|
|
if (err) {
|
|
/* Use data->gpio.dev as a flag for freeing gpiochip */
|
|
data->gpio.parent = NULL;
|
|
dev_warn(&client->dev, "could not add gpiochip\n");
|
|
} else {
|
|
dev_info(&client->dev, "gpios %i...%i\n",
|
|
data->gpio.base, data->gpio.base +
|
|
data->gpio.ngpio - 1);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
exit:
|
|
pca9532_destroy_devices(data, i);
|
|
return err;
|
|
}
|
|
|
|
static int pca9532_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pca9532_data *data = i2c_get_clientdata(client);
|
|
struct pca9532_platform_data *pca9532_pdata =
|
|
dev_get_platdata(&client->dev);
|
|
|
|
if (!pca9532_pdata)
|
|
return -EIO;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -EIO;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
|
|
|
|
dev_info(&client->dev, "setting platform data\n");
|
|
i2c_set_clientdata(client, data);
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
return pca9532_configure(client, data, pca9532_pdata);
|
|
}
|
|
|
|
static int pca9532_remove(struct i2c_client *client)
|
|
{
|
|
struct pca9532_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
err = pca9532_destroy_devices(data, data->chip_info->num_leds);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_i2c_driver(pca9532_driver);
|
|
|
|
MODULE_AUTHOR("Riku Voipio");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
|