mfd: palmas PMIC device support

Palmas is a PMIC from Texas Instruments and this is the MFD part of the
driver for this chip. The PMIC has SMPS and LDO regulators, a general
purpose ADC, GPIO, USB OTG mode detection, watchdog and RTC features.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 509 insertions, 0 deletions

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
new file mode 100644
index 000000000000..00c0aba7eba0
--- /dev/null
+++ b/drivers/mfd/palmas.c
@@ -0,0 +1,509 @@
+/*
+ * TI Palmas MFD Driver
+ *
+ * Copyright 2011-2012 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/palmas.h>
+
+static const struct resource gpadc_resource[] = {
+        {
+                .name = "EOC_SW",
+                .start = PALMAS_GPADC_EOC_SW_IRQ,
+                .end = PALMAS_GPADC_EOC_SW_IRQ,
+                .flags = IORESOURCE_IRQ,
+        }
+};
+
+static const struct resource usb_resource[] = {
+        {
+                .name = "ID",
+                .start = PALMAS_ID_OTG_IRQ,
+                .end = PALMAS_ID_OTG_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "ID_WAKEUP",
+                .start = PALMAS_ID_IRQ,
+                .end = PALMAS_ID_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "VBUS",
+                .start = PALMAS_VBUS_OTG_IRQ,
+                .end = PALMAS_VBUS_OTG_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "VBUS_WAKEUP",
+                .start = PALMAS_VBUS_IRQ,
+                .end = PALMAS_VBUS_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static const struct resource rtc_resource[] = {
+        {
+                .name = "RTC_ALARM",
+                .start = PALMAS_RTC_ALARM_IRQ,
+                .end = PALMAS_RTC_ALARM_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static const struct resource pwron_resource[] = {
+        {
+                .name = "PWRON_BUTTON",
+                .start = PALMAS_PWRON_IRQ,
+                .end = PALMAS_PWRON_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+enum palmas_ids {
+        PALMAS_PMIC_ID,
+        PALMAS_GPIO_ID,
+        PALMAS_LEDS_ID,
+        PALMAS_WDT_ID,
+        PALMAS_RTC_ID,
+        PALMAS_PWRBUTTON_ID,
+        PALMAS_GPADC_ID,
+        PALMAS_RESOURCE_ID,
+        PALMAS_CLK_ID,
+        PALMAS_PWM_ID,
+        PALMAS_USB_ID,
+};
+
+static const struct mfd_cell palmas_children[] = {
+        {
+                .name = "palmas-pmic",
+                .id = PALMAS_PMIC_ID,
+        },
+        {
+                .name = "palmas-gpio",
+                .id = PALMAS_GPIO_ID,
+        },
+        {
+                .name = "palmas-leds",
+                .id = PALMAS_LEDS_ID,
+        },
+        {
+                .name = "palmas-wdt",
+                .id = PALMAS_WDT_ID,
+        },
+        {
+                .name = "palmas-rtc",
+                .num_resources = ARRAY_SIZE(rtc_resource),
+                .resources = rtc_resource,
+                .id = PALMAS_RTC_ID,
+        },
+        {
+                .name = "palmas-pwrbutton",
+                .num_resources = ARRAY_SIZE(pwron_resource),
+                .resources = pwron_resource,
+                .id = PALMAS_PWRBUTTON_ID,
+        },
+        {
+                .name = "palmas-gpadc",
+                .num_resources = ARRAY_SIZE(gpadc_resource),
+                .resources = gpadc_resource,
+                .id = PALMAS_GPADC_ID,
+        },
+        {
+                .name = "palmas-resource",
+                .id = PALMAS_RESOURCE_ID,
+        },
+        {
+                .name = "palmas-clk",
+                .id = PALMAS_CLK_ID,
+        },
+        {
+                .name = "palmas-pwm",
+                .id = PALMAS_PWM_ID,
+        },
+        {
+                .name = "palmas-usb",
+                .num_resources = ARRAY_SIZE(usb_resource),
+                .resources = usb_resource,
+                .id = PALMAS_USB_ID,
+        }
+};
+
+static const struct regmap_config palmas_regmap_config[PALMAS_NUM_CLIENTS] = {
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .max_register = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
+                                        PALMAS_PRIMARY_SECONDARY_PAD3),
+        },
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .max_register = PALMAS_BASE_TO_REG(PALMAS_GPADC_BASE,
+                                        PALMAS_GPADC_SMPS_VSEL_MONITORING),
+        },
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .max_register = PALMAS_BASE_TO_REG(PALMAS_TRIM_GPADC_BASE,
+                                        PALMAS_GPADC_TRIM16),
+        },
+};
+
+static const struct regmap_irq palmas_irqs[] = {
+        /* INT1 IRQs */
+        [PALMAS_CHARG_DET_N_VBUS_OVV_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_CHARG_DET_N_VBUS_OVV,
+        },
+        [PALMAS_PWRON_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_PWRON,
+        },
+        [PALMAS_LONG_PRESS_KEY_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_LONG_PRESS_KEY,
+        },
+        [PALMAS_RPWRON_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_RPWRON,
+        },
+        [PALMAS_PWRDOWN_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_PWRDOWN,
+        },
+        [PALMAS_HOTDIE_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_HOTDIE,
+        },
+        [PALMAS_VSYS_MON_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_VSYS_MON,
+        },
+        [PALMAS_VBAT_MON_IRQ] = {
+                .mask = PALMAS_INT1_STATUS_VBAT_MON,
+        },
+        /* INT2 IRQs*/
+        [PALMAS_RTC_ALARM_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_RTC_ALARM,
+                .reg_offset = 1,
+        },
+        [PALMAS_RTC_TIMER_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_RTC_TIMER,
+                .reg_offset = 1,
+        },
+        [PALMAS_WDT_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_WDT,
+                .reg_offset = 1,
+        },
+        [PALMAS_BATREMOVAL_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_BATREMOVAL,
+                .reg_offset = 1,
+        },
+        [PALMAS_RESET_IN_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_RESET_IN,
+                .reg_offset = 1,
+        },
+        [PALMAS_FBI_BB_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_FBI_BB,
+                .reg_offset = 1,
+        },
+        [PALMAS_SHORT_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_SHORT,
+                .reg_offset = 1,
+        },
+        [PALMAS_VAC_ACOK_IRQ] = {
+                .mask = PALMAS_INT2_STATUS_VAC_ACOK,
+                .reg_offset = 1,
+        },
+        /* INT3 IRQs */
+        [PALMAS_GPADC_AUTO_0_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_GPADC_AUTO_0,
+                .reg_offset = 2,
+        },
+        [PALMAS_GPADC_AUTO_1_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_GPADC_AUTO_1,
+                .reg_offset = 2,
+        },
+        [PALMAS_GPADC_EOC_SW_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_GPADC_EOC_SW,
+                .reg_offset = 2,
+        },
+        [PALMAS_GPADC_EOC_RT_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_GPADC_EOC_RT,
+                .reg_offset = 2,
+        },
+        [PALMAS_ID_OTG_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_ID_OTG,
+                .reg_offset = 2,
+        },
+        [PALMAS_ID_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_ID,
+                .reg_offset = 2,
+        },
+        [PALMAS_VBUS_OTG_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_VBUS_OTG,
+                .reg_offset = 2,
+        },
+        [PALMAS_VBUS_IRQ] = {
+                .mask = PALMAS_INT3_STATUS_VBUS,
+                .reg_offset = 2,
+        },
+        /* INT4 IRQs */
+        [PALMAS_GPIO_0_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_0,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_1_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_1,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_2_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_2,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_3_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_3,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_4_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_4,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_5_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_5,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_6_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_6,
+                .reg_offset = 3,
+        },
+        [PALMAS_GPIO_7_IRQ] = {
+                .mask = PALMAS_INT4_STATUS_GPIO_7,
+                .reg_offset = 3,
+        },
+};
+
+static struct regmap_irq_chip palmas_irq_chip = {
+        .name = "palmas",
+        .irqs = palmas_irqs,
+        .num_irqs = ARRAY_SIZE(palmas_irqs),
+
+        .num_regs = 4,
+        .irq_reg_stride = 5,
+        .status_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
+                        PALMAS_INT1_STATUS),
+        .mask_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
+                        PALMAS_INT1_MASK),
+};
+
+static int __devinit palmas_i2c_probe(struct i2c_client *i2c,
+                            const struct i2c_device_id *id)
+{
+        struct palmas *palmas;
+        struct palmas_platform_data *pdata;
+        int ret = 0, i;
+        unsigned int reg, addr;
+        int slave;
+        struct mfd_cell *children;
+
+        pdata = dev_get_platdata(&i2c->dev);
+        if (!pdata)
+                return -EINVAL;
+
+        palmas = devm_kzalloc(&i2c->dev, sizeof(struct palmas), GFP_KERNEL);
+        if (palmas == NULL)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, palmas);
+        palmas->dev = &i2c->dev;
+        palmas->id = id->driver_data;
+        palmas->irq = i2c->irq;
+
+        for (i = 0; i < PALMAS_NUM_CLIENTS; i++) {
+                if (i == 0)
+                        palmas->i2c_clients[i] = i2c;
+                else {
+                        palmas->i2c_clients[i] =
+                                        i2c_new_dummy(i2c->adapter,
+                                                        i2c->addr + i);
+                        if (!palmas->i2c_clients[i]) {
+                                dev_err(palmas->dev,
+                                        "can't attach client %d\n", i);
+                                ret = -ENOMEM;
+                                goto err;
+                        }
+                }
+                palmas->regmap[i] = devm_regmap_init_i2c(palmas->i2c_clients[i],
+                                &palmas_regmap_config[i]);
+                if (IS_ERR(palmas->regmap[i])) {
+                        ret = PTR_ERR(palmas->regmap[i]);
+                        dev_err(palmas->dev,
+                                "Failed to allocate regmap %d, err: %d\n",
+                                i, ret);
+                        goto err;
+                }
+        }
+
+        ret = regmap_add_irq_chip(palmas->regmap[1], palmas->irq,
+                        IRQF_ONESHOT | IRQF_TRIGGER_LOW, -1, &palmas_irq_chip,
+                        &palmas->irq_data);
+        if (ret < 0)
+                goto err;
+
+        slave = PALMAS_BASE_TO_SLAVE(PALMAS_PU_PD_OD_BASE);
+        addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
+                        PALMAS_PRIMARY_SECONDARY_PAD1);
+
+        if (pdata->mux_from_pdata) {
+                reg = pdata->pad1;
+                ret = regmap_write(palmas->regmap[slave], addr, reg);
+                if (ret)
+                        goto err;
+        } else {
+                ret = regmap_read(palmas->regmap[slave], addr, &reg);
+                if (ret)
+                        goto err;
+        }
+
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_0))
+                palmas->gpio_muxed |= PALMAS_GPIO_0_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK))
+                palmas->gpio_muxed |= PALMAS_GPIO_1_MUXED;
+        else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
+                        (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
+                palmas->led_muxed |= PALMAS_LED1_MUXED;
+        else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
+                        (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
+                palmas->pwm_muxed |= PALMAS_PWM1_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK))
+                palmas->gpio_muxed |= PALMAS_GPIO_2_MUXED;
+        else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
+                        (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
+                palmas->led_muxed |= PALMAS_LED2_MUXED;
+        else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
+                        (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
+                palmas->pwm_muxed |= PALMAS_PWM2_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_3))
+                palmas->gpio_muxed |= PALMAS_GPIO_3_MUXED;
+
+        addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
+                        PALMAS_PRIMARY_SECONDARY_PAD2);
+
+        if (pdata->mux_from_pdata) {
+                reg = pdata->pad2;
+                ret = regmap_write(palmas->regmap[slave], addr, reg);
+                if (ret)
+                        goto err;
+        } else {
+                ret = regmap_read(palmas->regmap[slave], addr, &reg);
+                if (ret)
+                        goto err;
+        }
+
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_4))
+                palmas->gpio_muxed |= PALMAS_GPIO_4_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_5_MASK))
+                palmas->gpio_muxed |= PALMAS_GPIO_5_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_6))
+                palmas->gpio_muxed |= PALMAS_GPIO_6_MUXED;
+        if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_7_MASK))
+                palmas->gpio_muxed |= PALMAS_GPIO_7_MUXED;
+
+        dev_info(palmas->dev, "Muxing GPIO %x, PWM %x, LED %x\n",
+                        palmas->gpio_muxed, palmas->pwm_muxed,
+                        palmas->led_muxed);
+
+        reg = pdata->power_ctrl;
+
+        slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);
+        addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_POWER_CTRL);
+
+        ret = regmap_write(palmas->regmap[slave], addr, reg);
+        if (ret)
+                goto err;
+
+        children = kmemdup(palmas_children, sizeof(palmas_children),
+                           GFP_KERNEL);
+        if (!children) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        ret = mfd_add_devices(palmas->dev, -1,
+                              children, ARRAY_SIZE(palmas_children),
+                              NULL, regmap_irq_chip_get_base(palmas->irq_data));
+        kfree(children);
+
+        if (ret < 0)
+                goto err;
+
+        return ret;
+
+err:
+        mfd_remove_devices(palmas->dev);
+        kfree(palmas);
+        return ret;
+}
+
+static int palmas_i2c_remove(struct i2c_client *i2c)
+{
+        struct palmas *palmas = i2c_get_clientdata(i2c);
+
+        mfd_remove_devices(palmas->dev);
+        regmap_del_irq_chip(palmas->irq, palmas->irq_data);
+
+        return 0;
+}
+
+static const struct i2c_device_id palmas_i2c_id[] = {
+        { "palmas", },
+        { "twl6035", },
+        { "twl6037", },
+        { "tps65913", },
+};
+MODULE_DEVICE_TABLE(i2c, palmas_i2c_id);
+
+static struct of_device_id __devinitdata of_palmas_match_tbl[] = {
+        { .compatible = "ti,palmas", },
+        { /* end */ }
+};
+
+static struct i2c_driver palmas_i2c_driver = {
+        .driver = {
+                   .name = "palmas",
+                   .of_match_table = of_palmas_match_tbl,
+                   .owner = THIS_MODULE,
+        },
+        .probe = palmas_i2c_probe,
+        .remove = palmas_i2c_remove,
+        .id_table = palmas_i2c_id,
+};
+
+static int __init palmas_i2c_init(void)
+{
+        return i2c_add_driver(&palmas_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(palmas_i2c_init);
+
+static void __exit palmas_i2c_exit(void)
+{
+        i2c_del_driver(&palmas_i2c_driver);
+}
+module_exit(palmas_i2c_exit);
+
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_DESCRIPTION("Palmas chip family multi-function driver");
+MODULE_LICENSE("GPL");