mfd: tps65218: Add driver for the TPS65218 PMIC

The TPS65218 chip is a power management IC for Portable Navigation Systems
and Tablet Computing devices. It contains the following components:

 - Regulators.
 - Over Temperature warning and Shut down.

This patch adds support for tps65218 mfd device. At this time only
the regulator functionality is made available.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 282 insertions, 0 deletions

diff --git a/drivers/mfd/tps65218.c b/drivers/mfd/tps65218.c
new file mode 100644
index 000000000000..a74bfb59f18f
--- /dev/null
+++ b/drivers/mfd/tps65218.c
@@ -0,0 +1,282 @@
+/*
+ * Driver for TPS65218 Integrated power management chipsets
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License version 2 for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65218.h>
+
+#define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
+
+/**
+ * tps65218_reg_read: Read a single tps65218 register.
+ *
+ * @tps: Device to read from.
+ * @reg: Register to read.
+ * @val: Contians the value
+ */
+int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
+                        unsigned int *val)
+{
+        return regmap_read(tps->regmap, reg, val);
+}
+EXPORT_SYMBOL_GPL(tps65218_reg_read);
+
+/**
+ * tps65218_reg_write: Write a single tps65218 register.
+ *
+ * @tps65218: Device to write to.
+ * @reg: Register to write to.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
+                        unsigned int val, unsigned int level)
+{
+        int ret;
+        unsigned int xor_reg_val;
+
+        switch (level) {
+        case TPS65218_PROTECT_NONE:
+                return regmap_write(tps->regmap, reg, val);
+        case TPS65218_PROTECT_L1:
+                xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
+                ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
+                                                        xor_reg_val);
+                if (ret < 0)
+                        return ret;
+
+                return regmap_write(tps->regmap, reg, val);
+        default:
+                return -EINVAL;
+        }
+}
+EXPORT_SYMBOL_GPL(tps65218_reg_write);
+
+/**
+ * tps65218_update_bits: Modify bits w.r.t mask, val and level.
+ *
+ * @tps65218: Device to write to.
+ * @reg: Register to read-write to.
+ * @mask: Mask.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
+                unsigned int mask, unsigned int val, unsigned int level)
+{
+        int ret;
+        unsigned int data;
+
+        ret = tps65218_reg_read(tps, reg, &data);
+        if (ret) {
+                dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
+                return ret;
+        }
+
+        data &= ~mask;
+        data |= val & mask;
+
+        mutex_lock(&tps->tps_lock);
+        ret = tps65218_reg_write(tps, reg, data, level);
+        if (ret)
+                dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
+        mutex_unlock(&tps->tps_lock);
+
+        return ret;
+}
+
+int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
+                unsigned int mask, unsigned int val, unsigned int level)
+{
+        return tps65218_update_bits(tps, reg, mask, val, level);
+}
+EXPORT_SYMBOL_GPL(tps65218_set_bits);
+
+int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
+                unsigned int mask, unsigned int level)
+{
+        return tps65218_update_bits(tps, reg, mask, 0, level);
+}
+EXPORT_SYMBOL_GPL(tps65218_clear_bits);
+
+static struct regmap_config tps65218_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .cache_type = REGCACHE_RBTREE,
+};
+
+static const struct regmap_irq tps65218_irqs[] = {
+        /* INT1 IRQs */
+        [TPS65218_PRGC_IRQ] = {
+                .mask = TPS65218_INT1_PRGC,
+        },
+        [TPS65218_CC_AQC_IRQ] = {
+                .mask = TPS65218_INT1_CC_AQC,
+        },
+        [TPS65218_HOT_IRQ] = {
+                .mask = TPS65218_INT1_HOT,
+        },
+        [TPS65218_PB_IRQ] = {
+                .mask = TPS65218_INT1_PB,
+        },
+        [TPS65218_AC_IRQ] = {
+                .mask = TPS65218_INT1_AC,
+        },
+        [TPS65218_VPRG_IRQ] = {
+                .mask = TPS65218_INT1_VPRG,
+        },
+        [TPS65218_INVALID1_IRQ] = {
+        },
+        [TPS65218_INVALID2_IRQ] = {
+        },
+        /* INT2 IRQs*/
+        [TPS65218_LS1_I_IRQ] = {
+                .mask = TPS65218_INT2_LS1_I,
+                .reg_offset = 1,
+        },
+        [TPS65218_LS2_I_IRQ] = {
+                .mask = TPS65218_INT2_LS2_I,
+                .reg_offset = 1,
+        },
+        [TPS65218_LS3_I_IRQ] = {
+                .mask = TPS65218_INT2_LS3_I,
+                .reg_offset = 1,
+        },
+        [TPS65218_LS1_F_IRQ] = {
+                .mask = TPS65218_INT2_LS1_F,
+                .reg_offset = 1,
+        },
+        [TPS65218_LS2_F_IRQ] = {
+                .mask = TPS65218_INT2_LS2_F,
+                .reg_offset = 1,
+        },
+        [TPS65218_LS3_F_IRQ] = {
+                .mask = TPS65218_INT2_LS3_F,
+                .reg_offset = 1,
+        },
+        [TPS65218_INVALID3_IRQ] = {
+        },
+        [TPS65218_INVALID4_IRQ] = {
+        },
+};
+
+static struct regmap_irq_chip tps65218_irq_chip = {
+        .name = "tps65218",
+        .irqs = tps65218_irqs,
+        .num_irqs = ARRAY_SIZE(tps65218_irqs),
+
+        .num_regs = 2,
+        .mask_base = TPS65218_REG_INT_MASK1,
+};
+
+static const struct of_device_id of_tps65218_match_table[] = {
+        { .compatible = "ti,tps65218", },
+};
+
+static int tps65218_probe(struct i2c_client *client,
+                                const struct i2c_device_id *ids)
+{
+        struct tps65218 *tps;
+        const struct of_device_id *match;
+        int ret;
+
+        match = of_match_device(of_tps65218_match_table, &client->dev);
+        if (!match) {
+                dev_err(&client->dev,
+                        "Failed to find matching dt id\n");
+                return -EINVAL;
+        }
+
+        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+        if (!tps)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, tps);
+        tps->dev = &client->dev;
+        tps->irq = client->irq;
+        tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
+        if (IS_ERR(tps->regmap)) {
+                ret = PTR_ERR(tps->regmap);
+                dev_err(tps->dev, "Failed to allocate register map: %d\n",
+                        ret);
+                return ret;
+        }
+
+        mutex_init(&tps->tps_lock);
+
+        ret = regmap_add_irq_chip(tps->regmap, tps->irq,
+                        IRQF_ONESHOT, 0, &tps65218_irq_chip,
+                        &tps->irq_data);
+        if (ret < 0)
+                return ret;
+
+        ret = of_platform_populate(client->dev.of_node, NULL, NULL,
+                                   &client->dev);
+        if (ret < 0)
+                goto err_irq;
+
+        return 0;
+
+err_irq:
+        regmap_del_irq_chip(tps->irq, tps->irq_data);
+
+        return ret;
+}
+
+static int tps65218_remove(struct i2c_client *client)
+{
+        struct tps65218 *tps = i2c_get_clientdata(client);
+
+        regmap_del_irq_chip(tps->irq, tps->irq_data);
+
+        return 0;
+}
+
+static const struct i2c_device_id tps65218_id_table[] = {
+        { "tps65218", TPS65218 },
+        { },
+};
+MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
+
+static struct i2c_driver tps65218_driver = {
+        .driver         = {
+                .name   = "tps65218",
+                .owner  = THIS_MODULE,
+                .of_match_table = of_tps65218_match_table,
+        },
+        .probe          = tps65218_probe,
+        .remove         = tps65218_remove,
+        .id_table       = tps65218_id_table,
+};
+
+module_i2c_driver(tps65218_driver);
+
+MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
+MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
+MODULE_LICENSE("GPL v2");