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433 lines
10 KiB
433 lines
10 KiB
/* |
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* tps65217.c |
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* |
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* TPS65217 chip family multi-function driver |
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* |
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* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation version 2. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/i2c.h> |
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#include <linux/irq.h> |
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#include <linux/irqdomain.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps65217.h> |
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static const struct resource charger_resources[] = { |
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"), |
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"), |
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}; |
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static const struct resource pb_resources[] = { |
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"), |
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}; |
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static void tps65217_irq_lock(struct irq_data *data) |
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{ |
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struct tps65217 *tps = irq_data_get_irq_chip_data(data); |
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mutex_lock(&tps->irq_lock); |
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} |
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static void tps65217_irq_sync_unlock(struct irq_data *data) |
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{ |
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struct tps65217 *tps = irq_data_get_irq_chip_data(data); |
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int ret; |
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ret = tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK, |
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tps->irq_mask, TPS65217_PROTECT_NONE); |
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if (ret != 0) |
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dev_err(tps->dev, "Failed to sync IRQ masks\n"); |
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mutex_unlock(&tps->irq_lock); |
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} |
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static void tps65217_irq_enable(struct irq_data *data) |
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{ |
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struct tps65217 *tps = irq_data_get_irq_chip_data(data); |
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u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT; |
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tps->irq_mask &= ~mask; |
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} |
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static void tps65217_irq_disable(struct irq_data *data) |
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{ |
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struct tps65217 *tps = irq_data_get_irq_chip_data(data); |
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u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT; |
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tps->irq_mask |= mask; |
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} |
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static struct irq_chip tps65217_irq_chip = { |
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.name = "tps65217", |
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.irq_bus_lock = tps65217_irq_lock, |
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.irq_bus_sync_unlock = tps65217_irq_sync_unlock, |
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.irq_enable = tps65217_irq_enable, |
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.irq_disable = tps65217_irq_disable, |
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}; |
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static struct mfd_cell tps65217s[] = { |
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{ |
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.name = "tps65217-pmic", |
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.of_compatible = "ti,tps65217-pmic", |
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}, |
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{ |
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.name = "tps65217-bl", |
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.of_compatible = "ti,tps65217-bl", |
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}, |
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{ |
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.name = "tps65217-charger", |
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.num_resources = ARRAY_SIZE(charger_resources), |
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.resources = charger_resources, |
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.of_compatible = "ti,tps65217-charger", |
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}, |
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{ |
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.name = "tps65217-pwrbutton", |
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.num_resources = ARRAY_SIZE(pb_resources), |
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.resources = pb_resources, |
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.of_compatible = "ti,tps65217-pwrbutton", |
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}, |
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}; |
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static irqreturn_t tps65217_irq_thread(int irq, void *data) |
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{ |
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struct tps65217 *tps = data; |
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unsigned int status; |
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bool handled = false; |
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int i; |
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int ret; |
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ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status); |
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if (ret < 0) { |
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dev_err(tps->dev, "Failed to read IRQ status: %d\n", |
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ret); |
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return IRQ_NONE; |
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} |
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for (i = 0; i < TPS65217_NUM_IRQ; i++) { |
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if (status & BIT(i)) { |
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handle_nested_irq(irq_find_mapping(tps->irq_domain, i)); |
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handled = true; |
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} |
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} |
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if (handled) |
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return IRQ_HANDLED; |
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return IRQ_NONE; |
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} |
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static int tps65217_irq_map(struct irq_domain *h, unsigned int virq, |
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irq_hw_number_t hw) |
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{ |
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struct tps65217 *tps = h->host_data; |
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irq_set_chip_data(virq, tps); |
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irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq); |
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irq_set_nested_thread(virq, 1); |
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irq_set_parent(virq, tps->irq); |
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irq_set_noprobe(virq); |
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return 0; |
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} |
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static const struct irq_domain_ops tps65217_irq_domain_ops = { |
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.map = tps65217_irq_map, |
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}; |
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static int tps65217_irq_init(struct tps65217 *tps, int irq) |
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{ |
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int ret; |
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mutex_init(&tps->irq_lock); |
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tps->irq = irq; |
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/* Mask all interrupt sources */ |
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tps->irq_mask = TPS65217_INT_MASK; |
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tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK, |
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TPS65217_INT_MASK, TPS65217_PROTECT_NONE); |
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tps->irq_domain = irq_domain_add_linear(tps->dev->of_node, |
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TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps); |
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if (!tps->irq_domain) { |
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dev_err(tps->dev, "Could not create IRQ domain\n"); |
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return -ENOMEM; |
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} |
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ret = devm_request_threaded_irq(tps->dev, irq, NULL, |
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tps65217_irq_thread, IRQF_ONESHOT, |
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"tps65217-irq", tps); |
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if (ret) { |
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dev_err(tps->dev, "Failed to request IRQ %d: %d\n", |
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irq, ret); |
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return ret; |
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} |
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enable_irq_wake(irq); |
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return 0; |
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} |
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/** |
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* tps65217_reg_read: Read a single tps65217 register. |
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* |
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* @tps: Device to read from. |
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* @reg: Register to read. |
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* @val: Contians the value |
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*/ |
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int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, |
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unsigned int *val) |
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{ |
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return regmap_read(tps->regmap, reg, val); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_reg_read); |
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/** |
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* tps65217_reg_write: Write a single tps65217 register. |
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* |
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* @tps: Device to write to. |
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* @reg: Register to write to. |
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* @val: Value to write. |
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* @level: Password protected level |
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*/ |
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int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, |
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unsigned int val, unsigned int level) |
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{ |
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int ret; |
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unsigned int xor_reg_val; |
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switch (level) { |
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case TPS65217_PROTECT_NONE: |
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return regmap_write(tps->regmap, reg, val); |
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case TPS65217_PROTECT_L1: |
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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return regmap_write(tps->regmap, reg, val); |
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case TPS65217_PROTECT_L2: |
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(tps->regmap, reg, val); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
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xor_reg_val); |
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if (ret < 0) |
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return ret; |
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return regmap_write(tps->regmap, reg, val); |
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default: |
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return -EINVAL; |
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} |
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} |
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EXPORT_SYMBOL_GPL(tps65217_reg_write); |
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/** |
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* tps65217_update_bits: Modify bits w.r.t mask, val and level. |
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* |
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* @tps: Device to write to. |
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* @reg: Register to read-write to. |
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* @mask: Mask. |
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* @val: Value to write. |
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* @level: Password protected level |
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*/ |
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static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int val, unsigned int level) |
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{ |
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int ret; |
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unsigned int data; |
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ret = tps65217_reg_read(tps, reg, &data); |
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if (ret) { |
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dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); |
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return ret; |
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} |
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data &= ~mask; |
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data |= val & mask; |
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ret = tps65217_reg_write(tps, reg, data, level); |
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if (ret) |
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dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); |
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return ret; |
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} |
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int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int val, unsigned int level) |
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{ |
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return tps65217_update_bits(tps, reg, mask, val, level); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_set_bits); |
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int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, |
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unsigned int mask, unsigned int level) |
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{ |
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return tps65217_update_bits(tps, reg, mask, 0, level); |
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} |
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EXPORT_SYMBOL_GPL(tps65217_clear_bits); |
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static bool tps65217_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case TPS65217_REG_INT: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static const struct regmap_config tps65217_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = TPS65217_REG_MAX, |
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.volatile_reg = tps65217_volatile_reg, |
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}; |
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static const struct of_device_id tps65217_of_match[] = { |
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{ .compatible = "ti,tps65217"}, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, tps65217_of_match); |
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static int tps65217_probe(struct i2c_client *client) |
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{ |
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struct tps65217 *tps; |
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unsigned int version; |
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bool status_off = false; |
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int ret; |
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status_off = of_property_read_bool(client->dev.of_node, |
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"ti,pmic-shutdown-controller"); |
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
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if (!tps) |
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return -ENOMEM; |
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i2c_set_clientdata(client, tps); |
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tps->dev = &client->dev; |
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tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); |
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if (IS_ERR(tps->regmap)) { |
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ret = PTR_ERR(tps->regmap); |
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dev_err(tps->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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if (client->irq) { |
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tps65217_irq_init(tps, client->irq); |
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} else { |
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int i; |
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/* Don't tell children about IRQ resources which won't fire */ |
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for (i = 0; i < ARRAY_SIZE(tps65217s); i++) |
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tps65217s[i].num_resources = 0; |
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} |
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ret = devm_mfd_add_devices(tps->dev, -1, tps65217s, |
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ARRAY_SIZE(tps65217s), NULL, 0, |
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tps->irq_domain); |
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if (ret < 0) { |
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dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret); |
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return ret; |
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} |
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ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); |
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if (ret < 0) { |
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dev_err(tps->dev, "Failed to read revision register: %d\n", |
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ret); |
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return ret; |
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} |
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/* Set the PMIC to shutdown on PWR_EN toggle */ |
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if (status_off) { |
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ret = tps65217_set_bits(tps, TPS65217_REG_STATUS, |
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TPS65217_STATUS_OFF, TPS65217_STATUS_OFF, |
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TPS65217_PROTECT_NONE); |
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if (ret) |
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dev_warn(tps->dev, "unable to set the status OFF\n"); |
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} |
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dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", |
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(version & TPS65217_CHIPID_CHIP_MASK) >> 4, |
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version & TPS65217_CHIPID_REV_MASK); |
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return 0; |
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} |
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static int tps65217_remove(struct i2c_client *client) |
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{ |
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struct tps65217 *tps = i2c_get_clientdata(client); |
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unsigned int virq; |
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int i; |
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for (i = 0; i < TPS65217_NUM_IRQ; i++) { |
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virq = irq_find_mapping(tps->irq_domain, i); |
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if (virq) |
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irq_dispose_mapping(virq); |
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} |
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irq_domain_remove(tps->irq_domain); |
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tps->irq_domain = NULL; |
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return 0; |
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} |
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static const struct i2c_device_id tps65217_id_table[] = { |
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{"tps65217", TPS65217}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tps65217_id_table); |
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static struct i2c_driver tps65217_driver = { |
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.driver = { |
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.name = "tps65217", |
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.of_match_table = tps65217_of_match, |
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}, |
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.id_table = tps65217_id_table, |
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.probe_new = tps65217_probe, |
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.remove = tps65217_remove, |
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}; |
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static int __init tps65217_init(void) |
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{ |
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return i2c_add_driver(&tps65217_driver); |
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} |
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subsys_initcall(tps65217_init); |
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static void __exit tps65217_exit(void) |
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{ |
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i2c_del_driver(&tps65217_driver); |
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} |
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module_exit(tps65217_exit); |
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MODULE_AUTHOR("AnilKumar Ch <[email protected]>"); |
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MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); |
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MODULE_LICENSE("GPL v2");
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